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Antamanide is a cyclic decapeptide derived from the fungus Amanita phalloides. Here we show that antamanide inhibits the mitochondrial permeability transition pore, a central effector of cell death induction, by targeting the pore regulator cyclophilin D. Indeed, (i) permeability transition pore inhibition by antamanide is not additive with the cyclophilin D-binding drug cyclosporin A, (ii) the inhibitory action of antamanide on the pore requires phosphate, as previously shown for cyclosporin A; (iii) antamanide is ineffective in mitochondria or cells derived from cyclophilin D null animals, and (iv) abolishes CyP-D peptidyl-prolyl cis-trans isomerase activity. Permeability transition pore inhibition by antamanide needs two critical residues in the peptide ring, Phe6 and Phe9, and is additive with ubiquinone 0, which acts on the pore in a cyclophilin D-independent fashion. Antamanide also abrogates mitochondrial depolarization and the ensuing cell death caused by two well-characterized pore inducers, clotrimazole and a hexokinase II N-terminal peptide. Our findings have implications for the comprehension of cyclophilin D activity on the permeability transition pore and for the development of novel pore-targeting drugs exploitable as cell death inhibitors.
List inhibtors targeting the mitochondrial permeability transition pore.
Here we show that antamanide inhibits the mitochondrial permeability transition pore, a central effector of cell death induction, by targeting the pore regulator cyclophilin D.
: Atherosclerosis is an underlying cause of coronary heart disease. Foam cell, a hallmark of atherosclerosis, is prominently derived from monocyte-differentiated macrophage, and vascular smooth muscle cells (VSMCs) through unlimitedly phagocytizing oxidized low-density lipoprotein (oxLDL). Therefore, the inhibition of monocyte adhesion to endothelium and uptake of oxLDL might be a breakthrough point for retarding atherosclerosis. Formononetin, an isoflavone extracted from , has exhibited multiple inhibitory effects on proatherogenic factors, such as obesity, dyslipidemia, and inflammation in different animal models. However, its effect on atherosclerosis remains unknown. In this study, we determined if formononetin can inhibit atherosclerosis and elucidated the underlying molecular mechanisms. : ApoE deficient mice were treated with formononetin contained in high-fat diet for 16 weeks. After treatment, mouse aorta, macrophage and serum samples were collected to determine lesions, immune cell profile, lipid profile and expression of related molecules. Concurrently, we investigated the effect of formononetin on monocyte adhesion, foam cell formation, endothelial activation, and macrophage polarization and . : Formononetin reduced and aortic root sinus lesions size. Formononetin enhanced lesion stability by changing the composition of plaque. VSMC- and macrophage-derived foam cell formation and its accumulation in arterial wall were attenuated by formononetin, which might be attributed to decreased SRA expression and reduced monocyte adhesion. Formononetin inhibited atherogenic monocyte adhesion and inflammation. KLF4 negatively regulated the expression of SRA at transcriptional and translational level. : Our study demonstrate that formononetin can substantially attenuate the development of atherosclerosis via regulation of interplay between KLF4 and SRA, which suggests the formononetin might be a novel therapeutic approach for inhibition of atherosclerosis.
What is a foam cell?
Foam cell, a hallmark of atherosclerosis, is prominently derived from monocyte-differentiated macrophage, and vascular smooth muscle cells (VSMCs) through unlimitedly phagocytizing oxidized low-density lipoprotein (oxLDL). Therefore, the inhibition of monocyte adhesion to endothelium and uptake of oxLDL might be a breakthrough point for retarding atherosclerosis.
Histones form chromatin and play a key role in the regulation of gene expression. As an epigenetic information form, histone modifications such as methylation, phosphorylation, acetylation, and ubiquitination are closely related to the regulation of genes. In the last two decades, cancer scientists discovered that some histone modifications, including acetylation and methylation, are perturbed in cancer diseases. Recurrent histone mutations, which hinder histone methylation and are implicated in oncogenesis, are recently identified in several cancer disease and called oncohistones. Well-known oncohistones, with mutations on both H3.1 and H3.3, include H3K36M in chondroblastoma, H3K27M in glioma, and H3G34 mutations that exist in bone cancers and gliomas. Oncohistone expression can lead to epigenome/transcriptome reprogramming and eventually to oncogenesis. The H3K27M, H3G34V/R, and H3K36M histone mutations can lead to the substitution of amino acid(s) at or near a lysine residue, which is a methylation target. H3K27M characteristically exists in diffuse intrinsic pontine glioma (pediatric DIPG), and its expression can cause a global decrease of the methylation of histone at the lysine residue. Uncovering the molecular mechanisms of H3K27M-driven tumorigenesis has recently led to the identification of some potential therapeutic targets in diffuse intrinsic pontine glioma. In this chapter, we will review and summarize recent studies on the H3K27M-driven tumorigenic mechanisms and properties and the role of H3.1K27M and H3.3K27M oncohistones in brain tumors.
Is histone variant H3.3K27M associated with gliomas?
Well-known oncohistones, with mutations on both H3.1 and H3.3, include H3K36M in chondroblastoma, H3K27M in glioma
Evaluation of primary DNA-damage is one way to identify potential genotoxic agents and for this purpose the Comet assay has, for the last decades, been used to monitor DNA single strand and double strand breaks in individual cells. Various attempts have been made to modify the different steps in the in vitro protocol for the Comet assay in order to improve its sensitivity. However, to the best of our knowledge, nobody has tried to replace the traditionally used NaOH-based electrophoresis solution (pH > 13), with another type of solution. In the present paper, using TK-6 cells exposed to different concentrations of HO or ionizing radiation, we present evidence clearly showing that a low-conductive LiOH-based electrophoresis solution at pH 12.5, and a more gentle lysis procedure, significantly improved both the speed and sensitivity of the assay. The new approach, which we call the Flash-comet, is based on a lysis buffer at pH 8.5, an unwinding time of 2.5 min in a LiOH solution without EDTA at pH 12.5, and an electrophoresis time of 1 min at 150 V (5 V/cm) using the same solution.
Does a comet assay measure radiation induced mutations?
Evaluation of primary DNA-damage is one way to identify potential genotoxic agents and for this purpose the Comet assay has, for the last decades, been used to monitor DNA single strand and double strand breaks in individual cells
Since Jacob and Monod's characterization of the role of DNA elements in gene control, it has been recognized that the linear organization of genome structure is important for the regulation of gene transcription and hence the manifestation of phenotypes. Similarly, it has long been hypothesized that the spatial organization (in three dimensions evolving through time), as part of the epigenome, makes a significant contribution to the genotype-phenotype transition. Proximity ligation assays commonly known as chromosome conformation capture (3C) and 3C based methodologies (e.g., GCC, HiC and ChIA-Pet) are increasingly being incorporated into empirical studies to investigate the role that three-dimensional genome structure plays in the regulation of phenotype. The apparent simplicity of these methodologies-crosslink chromatin, digest, dilute, ligate, detect interactions-belies the complexity of the data and the considerations that should be taken into account to ensure the generation and accurate interpretation of reliable data. Here we discuss the probabilistic nature of these methodologies and how this contributes to their endogenous limitations.
What is the methodological principle of ChIA-PET?
Proximity ligation assays commonly known as chromosome conformation capture (3C) and 3C based methodologies (e.g., GCC, HiC and ChIA-Pet) are increasingly being incorporated into empirical studies to investigate the role that three-dimensional genome structure plays in the regulation of phenotype.
There is currently a strong push in the research community to develop biological scale implementations of neuron based vision models. Systems at this scale are computationally demanding and generally utilize more accurate neuron models, such as the Izhikevich and the Hodgkin-Huxley models, in favor of the more popular integrate and fire model. We examine the feasibility of using graphics processing units (GPUs) to accelerate a spiking neural network based character recognition network to enable such large scale systems. Two versions of the network utilizing the Izhikevich and Hodgkin-Huxley models are implemented. Three NVIDIA general-purpose (GP) GPU platforms are examined, including the GeForce 9800 GX2, the Tesla C1060, and the Tesla S1070. Our results show that the GPGPUs can provide significant speedup over conventional processors. In particular, the fastest GPGPU utilized, the Tesla S1070, provided a speedup of 5.6 and 84.4 over highly optimized implementations on the fastest central processing unit (CPU) tested, a quadcore 2.67 GHz Xeon processor, for the Izhikevich and the Hodgkin-Huxley models, respectively. The CPU implementation utilized all four cores and the vector data parallelism offered by the processor. The results indicate that GPUs are well suited for this application domain.
Why graphics processing units (GPU) are more suitable for biological tasks than central processing units (CPU)?
Our results show that the GPGPUs can provide significant speedup over conventional processors
We report an 18-year-old female with facioscapulohumeral dystrophy (FSHD), who had sensorineural deafness, retinal vessel abnormality, mental retardation, and epilepsy. She had infantile spasms at 6 months of age. Muscle atrophy and weakness of facial muscles were first noticed at 3 years of age. From 10 years of age, she had rapidly progressive generalized muscle weakness especially of facial, neck and truncal muscles with marked lordosis. Although mental retardation is commonly complicated with FSHD, infantile spasms or epilepsy has never been reported. Not only mental retardation but epilepsy may be one of the central nervous system symptoms in a systemic disorder, FSHD.
Which are some symptoms of FSHD?
We report an 18-year-old female with facioscapulohumeral dystrophy (FSHD), who had sensorineural deafness, retinal vessel abnormality, mental retardation, and epilepsy.
In cystic fibrosis (CF), sweat chloride concentration has been proposed as an index of CFTR function for testing systemic drugs designed to activate mutant CFTR. This suggestion arises from the assumption that greater residual CFTR function should lead to a lower sweat chloride concentration, as well as protection against severe lung disease. This logic gives rise to the hypothesis that the lower the sweat chloride concentration, the less severe the lung disease. In order to test this hypothesis, we studied 230 patients homozygous for the DeltaF508 allele, and 34 patients with at least one allele associated with pancreatic sufficiency, born since January 1, 1955, who have pulmonary function data and sweat chloride concentrations recorded in our CF center database, and no culture positive for B. cepacia. We calculated a severity index for pulmonary disease, using an approach which takes into account all available pulmonary function data as well as the patient's current age and survival status. Patients with alleles associated with pancreatic sufficiency had significantly better survival (P = 0.0083), lower sweat chloride concentration (81.4 +/- 23.8 vs. 103.2 +/- 14.2 mEq/l, P < 0.0001), slower rate of decline of FEV(1) % predicted (-0.75 +/- 0.34 vs. -2.34 +/- 0.17% predicted per year), and a better severity index than patients homozygous for the DeltaF508 allele (median 73rd percentile vs. median 55th percentile, P = 0.0004). However, the sweat chloride concentration did not correlate with the severity index, either in the population as a whole, or in the population of patients with alleles associated with pancreatic sufficiency, who are thought to have some residual CFTR function. These data suggest that, by itself, sweat chloride concentration does not necessarily predict a milder pulmonary course in patients with cystic fibrosis.
Sweat Chloride Testing is used for which disease?
In cystic fibrosis (CF), sweat chloride concentration has been proposed as an index of CFTR function for testing systemic drugs designed to activate mutant CFTR.
Radiation-induced sarcoma (RIS) is an unusual but well documented tumor. The frequency of RIS of the head and neck region has been reported as 0.143%. In the literature the median interval between irradiation and development of sarcoma is 11 years. Cases of RIS with a short latent period, that is, less than 4 years are rare. We report a case of a 34-year-old female who developed an osteosarcoma of the scalp, over a previous craniotomy scar, 3 years after excision of a frontal anaplastic oligodendroglioma which had been followed by a course of 6 weeks radiotherapy (58 Gy) and 6 cycles of temozolomide. The histological features were those of a high-grade osteosarcoma with epidermotropism of tumor cells. Lymph nodes were partially replaced by high-grade metastatic osteosarcoma, with extra-nodal lymphatic tumor thrombi. To our knowledge the only other case report of post-radiation osteosarcoma with a short latency period was a case of osteosarcoma in the craniofacial bone 3 years after radiotherapy for maxillary squamous cell carcinoma. The histological finding of prominent replacement of the epidermis by osteosarcoma has not been reported before.
Can radiotherapy cause radiation induced osteosarcoma?
To our knowledge the only other case report of post-radiation osteosarcoma with a short latency period was a case of osteosarcoma in the craniofacial bone 3 years after radiotherapy for maxillary squamous cell carcinoma.
Hutchinson-Gilford progeria causing premature aging of children is a genetic disease and according to most authors has an autosomal dominant inheritance. It has been regarded as a model of the process of aging. In 2003 mutations in the LMNA gene, localized f in chromosome 1, responsible for the disease, were identified. The most frequent mutation is located in exon 11, C1824T and does not change glycin in position 608 of protein chain, but activates cryptic splice site. This results in shortened lamin A synthesis which is named progerin. Point mutations in other exons of LMNA, found in progeria patients, are responsible for atypical phenotypes.
Is progeria caused by an autosomal recessive gene?
Hutchinson-Gilford progeria causing premature aging of children is a genetic disease and according to most authors has an autosomal dominant inheritance.
Histone methylation represents one of the most critical epigenetic events in DNA function regulation in eukaryotic organisms. Classic molecular biology and genetics tools provide significant knowledge about mechanisms and physiological roles of histone methyltransferases and demethylases in various cellular processes. In addition to this stream line, development and application of chemistry and chemistry-related techniques are increasingly involved in biological study, and offer information otherwise difficult to obtain by standard molecular biology methods. Herein, we review recent achievements and progress in developing and applying chemical and biochemical approaches in the study of histone methylation, including chromatin immunoprecipitation, chemical ligation, mass spectrometry, biochemical methylation and demethylation assays, and inhibitor development. These technological advances allow histone methylation to be studied from genome-wide level to molecular and atomic levels. With ChIP technology, information can be obtained about precise mapping of histone methylation patterns at specific promoters, genes, or other genomic regions. MS is particularly useful in detecting and analyzing methylation marks in histone and nonhistone protein substrates. Chemical approaches that permit site-specific incorporation of methyl groups into histone proteins greatly facilitate the investigation of biological impacts of methylation at individual modification sites. Discovery and design of selective organic inhibitors of histone methyltransferases and demethylases provide chemical probes to interrogate methylation-mediated cellular pathways. Overall, these chemistry-related technological advances have greatly improved our understanding of the biological functions of histone methylation in normal physiology and diseased states, and also are of great potential to translate basic epigenetics research into diagnostic and therapeutic applications in the clinic.
When modifying histones with either activating or repressing marks, such as with acetyl and methyl groups, histone acetyltransferases and histone methyltransferases normally modify which amino acids?
Histone methylation represents one of the most critical epigenetic events in DNA function regulation in eukaryotic organisms.
CD4(+)CD25(+) regulatory T cells (Tregs) are considered to play a key role as suppressors of immune mediated reactions. The analysis of Treg function in patients with autoimmune, allergic or oncogenic diseases has emerged over the past years. In the present study we describe a CFSE based protocol to measure Treg mediated suppression of CD4(+) T cells. Measuring Treg suppressive capacity towards proliferation of anti-CD3 Ab stimulated CD4(+)CD25(-) T cells in coculture experiments by means of a CFSE based and a classical [(3)H]thymidine incorporation assay gave similar results, provided that CD4(+)CD25(+) T cells were anergic. However, when CD4(+)CD25(+) T cells proliferated upon mitogenic stimulation, data obtained by the CFSE assay allowed the detection of a significant Treg suppression whereas this was clearly underestimated using the [(3)H]thymidine assay. In addition, an indirect CFSE based method was developed to analyze antigen specific responses of total CD4(+) T cells and Treg depleted CD4(+) T cells (i.e. CD4(+)CD25(-) T cells). Our results indicate that, in healthy individuals, CD4(+) T cell responses against the multiple sclerosis (MS) auto-antigens, myelin basic protein (MBP) and myelin oligodendrocyte glycoprotein (MOG), were increased in Treg depleted CD4(+) T cells as compared to total CD4(+) T cells. Our initial data suggest that Tregs in MS patients show an impaired suppression of myelin reactive T cells when compared to healthy controls. Moreover, this experimental setup permits the measurement of cytokine production of the antigen proliferated CFSE(low) T cells by additional flow cytometric analyses. In conclusion, the described CFSE based Treg suppression assay is a valuable tool to study suppressor T cells in (auto)immune disorders.
Are Tregs CD4(+)CD25(+) regulatory T cells a positive regulator of the immune response?
CD4(+)CD25(+) regulatory T cells (Tregs) are considered to play a key role as suppressors of immune mediated reactions. The a
Massively parallel sequencing identifies pathogenic variants in the genes affected in Alport syndrome (COL4A3-COL4A5) in as many as 30% of individuals with focal and segmental glomerulosclerosis (FSGS), 10% of those with kidney failure of unknown cause, and 20% with familial immunoglobulin A (IgA) glomerulonephritis. FSGS associated with COL4A3-COL4A5 variants is usually present by the onset of kidney failure and may develop because the abnormal glomerular membranes result in podocyte loss and secondary hyperfiltration. The association of COL4A3-COL4A5 variants with kidney failure or IgA glomerulonephritis may be coincidental. However, pathogenic variants in these conditions occur more often than they should by chance, which suggests that the variants are disease-causing. COL4A3-COL4A5 variants are also found in cystic kidney diseases after autosomal dominant polycystic kidney disease has been excluded. COL4A3-COL4A5 variants should be suspected in individuals with FSGS, kidney failure of unknown cause, or familial IgA glomerulonephritis, especially where there is persistent hematuria and a family history of hematuria or kidney failure.
Which syndrome is caused by pathogenic COL4A3-COL4A5 variants?
Massively parallel sequencing identifies pathogenic variants in the genes affected in Alport syndrome (COL4A3-COL4A5) in as many as 30% of individuals with focal and segmental glomerulosclerosis (FSGS), 10% of those with kidney failure of unknown cause, and 20% with familial immunoglobulin A (IgA) glomerulonephritis.
Alu elements are the most abundant repetitive elements in the human genome; they emerged from the signal recognition particle RNA gene and are composed of two related but distinct monomers (left and right arms). Alu RNAs transcribed from these elements are present at low levels at normal cell growth but various stress conditions increase their abundance. Alu RNAs are known to bind the cognate proteins SRP9/14. We purified synthetic Alu RNP, composed of Alu RNA in complex with SRP9/14, and investigated the effects of Alu RNPs and naked Alu RNA on protein translation. We found that the dimeric Alu RNP and the monomeric left and right Alu RNPs have a general dose-dependent inhibitory effect on protein translation. In the absence of SRP9/14, Alu RNA has a stimulatory effect on all reporter mRNAs. The unstable structure of sRight RNA suggests that the differential activities of Alu RNP and Alu RNA may be explained by conformational changes in the RNA. We demonstrate that Alu RNPs and Alu RNAs do not stably associate with ribosomes during translation and, based on the analysis of polysome profiles and synchronized translation, we show that Alu RNP and Alu RNA regulate translation at the level of initiation.
Are Alu elements transcribed?
Alu RNAs are known to bind the cognate proteins SRP9/14
Cilengitide is an RGD-peptide of sequence cyclo[RGDfNMeV] that was was developed as a highly active and selective ligand for the αvβ3 and αvβ5 integrin receptors. We describe the synthesis of three analogues of this peptide in which the N-Me group has been replaced by N-oligoethylene glycol (N-OEG) chains of increasing size: namely N-OEG2, N-OEG11, and N-OEG23, which are respectively composed of 2, 11, and 23 ethylene oxide monomer units. The different N-OEG cyclopeptides and the original peptide were compared with respect to lipophilicity and biological activity. The N-OEG2 analogue was straightforward to synthesize in solid phase using an Fmoc-N-OEG2 building block. The syntheses of the N-OEG11 and N-OEG23 cyclopeptides are hampered by the increased steric hindrance of the N-substituent, and could only be achieved by segment coupling, which takes place with epimerization and thus requires extensive product purification. All the N-OEG analogues were found to be more hydrophobic than the parent peptide, and their hydrophobicity was systematically enhanced upon increasing the length of the OEG chain. The N-OEG2 cyclopeptide displayed the same capacity as Cilengitide to inhibit the integrin-mediated adhesion of HUVEC endothelial, DAOY gliobastoma, and HT-29 colon cancer cells to their ligands vitronectin and fibrinogen. The N-OEG11 and N-OEG23 analogues also inhibited cell adhesion to these immobilized ligands, but their IC50 values dropped by 1 order of magnitude with respect to the parent peptide. These results indicate that replacement of the backbone N-Me group of Cilengitide by a short N-OEG chain provides a more lipophilic analogue with a similar biological activity. Upon increasing the size of the N-OEG chain, liophilicity is enhanced, but synthetic yields drop and the longer polymer chains may impede targeted binding.
List receptors of the drug Cilengitide
Cilengitide is an RGD-peptide of sequence cyclo[RGDfNMeV] that was was developed as a highly active and selective ligand for the αvβ3 and αvβ5 integrin receptors.
This meta-analysis has shown that omega-3 PUFAs might significantly decrease apo C-III. Key messages Omega-3 PUFA supplements significantly reduce apo C-III plasma levels, particularly in hypertriglyceridemic patients when applied in appropriate dose (more than 2 g/day) Triglyceride (TG)-lowering effect is achieved via peroxisome proliferator-activated receptors α Further studies should address the effect of omega-3 PUFAs alone or with other lipid-lowering drugs in order to provide a final answer whether apo C-III could be an important target for prevention of cardiovascular disease New apo C-III antisense oligonucleotide drug (Volanesorsen) showed to be promising in decreasing elevated TGs by reducing levels of apo C-III mRNA.
Describe mechanism of action of volanesorsen.
Further studies should address the effect of omega-3 PUFAs alone or with other lipid-lowering drugs in order to provide a final answer whether apo C-III could be an important target for prevention of cardiovascular disease New apo C-III antisense oligonucleotide drug (Volanesorsen) showed to be promising in decreasing elevated TGs by reducing levels of apo C-III mRNA.
In CHF patients TSH levels even slightly above normal range are independently associated with a greater likelihood of heart failure progression. This supports the need for prospective studies aimed at clarifying the most appropriate therapeutic approach to sub-clinical hypothyroidism in such patients.
is pharmacological treatment of subclinical hypothyroidism effective in reducing cardiovascular events?
In CHF patients TSH levels even slightly above normal range are independently associated with a greater likelihood of heart failure progression.
Staff at nuclear medicine departments receive doses of ionising radiation higher than the staff of radiotherapy and radiology departments, with the exception of interventional radiologists. Due to the updated lower occupational exposure limit for the lens of the eye, we measured eye exposure in workers of the Nuclear Medicine Department, Pomeranian Medical University in Szczecin, Poland. EYE-D™ dosimeters were used for 3 months by 10 employees working with sources of ionising radiation. Personal dosimeters also measured the exposure of the whole body and hands. The 3-month dose equivalents for the lens of the eye in the employees was 0.20-0.72 mSv. Staff at NMD PMU do not require regular routine eye lens dose monitoring. Eye lens doses were well within the new annual limit of 20 mSv. Doses to the whole body may be used as an indicator of the eye lens doses in the monitored department.
What is the current regulation of eye lens radiation exposure?
Staff at nuclear medicine departments receive doses of ionising radiation higher than the staff of radiotherapy and radiology departments, with the exception of interventional radiologists
The single amphioxus Hox cluster contains 15 genes and may well resemble the ancestral chordate Hox cluster. We have sequenced the Hox genomic complement of the European amphioxus Branchiostoma lanceolatum and compared it to the American species, Branchiostoma floridae, by phylogenetic footprinting to gain insights into the evolution of Hox gene regulation in chordates. We found that Hox intergenic regions are largely conserved between the two amphioxus species, especially in the case of genes located at the 3' of the cluster, a trend previously observed in vertebrates. We further compared the amphioxus Hox cluster with the human HoxA, HoxB, HoxC, and HoxD clusters, finding several conserved noncoding regions, both in intergenic and intronic regions. This suggests that the regulation of Hox genes is highly conserved across chordates, consistent with the similar Hox expression patterns in vertebrates and amphioxus.
Describe the involvement of conserved noncoding sequences in the regulation of Hox genes.
We further compared the amphioxus Hox cluster with the human HoxA, HoxB, HoxC, and HoxD clusters, finding several conserved noncoding regions, both in intergenic and intronic regions.
Evolocumab (Repatha) for patients with hypercholesterolemia whose condition has not been controlled by statins and other therapies; trifluridine/tipiracil (Lonsurf) for metastatic colorectal cancer; and blood coagulation factor VIII (Nuwiq) for adults and children with hemophilia A.
Which drugs are included in the Lonsurf pill?
Evolocumab (Repatha) for patients with hypercholesterolemia whose condition has not been controlled by statins and other therapies; trifluridine/tipiracil (Lonsurf) for metastatic colorectal cancer; and blood coagulation factor VIII (Nuwiq) for adults and children with hemophilia A.
Oral pregabalin, a calcium channel alpha(2)delta-subunit ligand with analgesic, anxiolytic and antiepileptic activity, has shown efficacy in the treatment of fibromyalgia. It has a multidimensional effect in the treatment of this complex condition, and is associated with rapid and clinically significant improvements in several outcome measures relating to core symptoms of the syndrome, including pain and sleep, in patients with long-standing fibromyalgia. Pregabalin treatment is also associated with improvements in the overall health status of these patients. The beneficial effects of pregabalin are durable in patients with an initial response to the drug. The most common adverse events associated with the drug are dizziness and somnolence, which are generally mild to moderate in intensity and are tolerated by many patients. Pregabalin is, therefore, a valuable option in the first-line treatment of patients with fibromyalgia.
Which drug is considered as the first line treatment of fibromyalgia?
Pregabalin is, therefore, a valuable option in the first-line treatment of patients with fibromyalgia.
Cyclin dependent protein kinases (CDKs) have become attractive drug targets in an effort to identify effective inhibitors of the parasite Plasmodium falciparum, the causative agent of the most severe form of human malaria. We tested known CDK inhibitors for their ability to inhibit two malarial CDKs: Pfmrk and PfPK5. Many broad spectrum CDK inhibitors failed to inhibit Pfmrk suggesting that the active site differs from other CDKs in important ways. By screening compounds in the Walter Reed chemical database, we identified oxindole-based compounds as effective inhibitors of Pfmrk (IC(50) = 1.5 microM). These compounds have low cross-reactivity against PfPK5 and human CDK1 demonstrating selectivity for Pfmrk. Amino acid comparison of the active sites of Pfmrk and PfPK5 identified unique amino acid differences that may explain this selectivity and be exploited for further drug development efforts.
Which is the causative agent of malaria?
Cyclin dependent protein kinases (CDKs) have become attractive drug targets in an effort to identify effective inhibitors of the parasite Plasmodium falciparum, the causative agent of the most severe form of human malaria.
Drosophila melanogaster has a single Adar gene encoding a protein related to mammalian ADAR2 that edits transcripts encoding glutamate receptor subunits. We describe the structure of the Drosophila Adar locus and use ModENCODE information to supplement published data on Adar gene transcription, and splicing. We discuss the roles of ADAR in Drosophila in terms of the two main types of RNA molecules edited and roles of ADARs as RNA-binding proteins. Site-specific RNA editing events in transcripts encoding ion channel subunits were initially found serendipitously and subsequent directed searches for editing sites and transcriptome sequencing have now led to 972 edited sites being identified in 597 transcripts. Four percent of D. melanogaster transcripts are site-specifically edited and these encode a wide range of largely membrane-associated proteins expressed particularly in CNS. Electrophysiological studies on the effects of specific RNA editing events on ion channel subunits do not suggest that loss of RNA editing events in ion channels consistently produce a particular outcome such as making Adar mutant neurons more excitable. This possibility would have been consistent with neurodegeneration seen in Adar mutant fly brains. A further set of ADAR targets are dsRNA intermediates in siRNA generation, derived from transposons and from structured RNA loci. Transcripts with convergent overlapping 3' ends are also edited and the first discovered instance of RNA editing in Drosophila, in the Rnp4F transcript, is an example. There is no evidence yet to show that Adar antagonizes RNA interference in Drosophila. Evidence has been obtained that catalytically inactive ADAR proteins exert effects on microRNA generation and RNA interference. Whether all effects of inactive ADARs are due to RNA-binding or to even further roles of these proteins remains to be determined.
Which is the major RNA editing enzyme in Drosophila melanogaster?
Drosophila melanogaster has a single Adar gene encoding a protein related to mammalian ADAR2 that edits transcripts encoding glutamate receptor subunits.
Reproducibility is one of the most important issues for generalizing the results of clinical research; however, low reproducibility in neuroimaging studies is well known. To overcome this problem, the Enhancing Neuroimaging Genetics through Meta-Analysis (ENIGMA) consortium, an international neuroimaging consortium, established standard protocols for imaging analysis and employs either meta- and mega-analyses of psychiatric disorders with large sample sizes. The Cognitive Genetics Collaborative Research Organization (COCORO) in Japan promotes neurobiological studies in psychiatry and has successfully replicated and extended works of ENIGMA especially for neuroimaging studies. For example, (a) the ENIGMA consortium showed subcortical regional volume alterations in patients with schizophrenia (n = 2,028) compared to controls (n = 2,540) across 15 cohorts using meta-analysis. COCORO replicated the volumetric changes in patients with schizophrenia (n = 884) compared to controls (n = 1,680) using the ENIGMA imaging analysis protocol and mega-analysis. Furthermore, a schizophrenia-specific leftward asymmetry for the pallidum volume was demonstrated; and (b) the ENIGMA consortium identified white matter microstructural alterations in patients with schizophrenia (n = 1,963) compared to controls (n = 2,359) across 29 cohorts. Using the ENIGMA protocol, a study from COCORO showed similar results in patients with schizophrenia (n = 696) compared to controls (n = 1,506) from 12 sites using mega-analysis. Moreover, the COCORO study found that schizophrenia, bipolar disorder (n = 211) and autism spectrum disorder (n = 126), but not major depressive disorder (n = 398), share similar white matter microstructural alterations, compared to controls. Further replication and harmonization of the ENIGMA consortium and COCORO will contribute to the generalization of their research findings.
Describe the Enhancing NeuroImaging Genetics through Meta-Analysis (ENIGMA) Consortium
To overcome this problem, the Enhancing Neuroimaging Genetics through Meta-Analysis (ENIGMA) consortium, an international neuroimaging consortium, established standard protocols for imaging analysis and employs either meta- and mega-analyses of psychiatric disorders with large sample sizes.
Several cancers are highly refractory to conventional chemotherapy. The survival of tumors in several cases is assisted by checkpoint immunomodulation to maintain the imbalance between immune surveillance and cancer cell proliferation. Check point antibody inhibitors, such as anti-PD-1/PD-L1, are a novel class of inhibitors that function as a tumor suppressing factor via modulation of immune cell-tumor cell interaction. These checkpoint blockers are rapidly becoming a highly promising cancer therapeutic approach that yields remarkable antitumor responses with limited side effects. In recent times, more than four check point antibody inhibitors have been commercialized for targeting PD-1, PDL-1, and CTLA-4. Despite the huge success and efficacy of the anti-PD therapy response, it is limited to specific types of cancers, which attributes to the insufficient and heterogeneous expression of PD-1 in the tumor microenvironment. Herein, we review the current landscape of the PD-1/PD-L1 mechanistic role in tumor immune evasion and therapeutic outcome for cancer treatment. We also review the current progress in clinical trials, combination of drug therapy with immunotherapy, safety, and future of check point inhibitors for multiple types of cancer.
What are check point inhibitors?
Check point antibody inhibitors, such as anti-PD-1/PD-L1, are a novel class of inhibitors that function as a tumor suppressing factor via modulation of immune cell-tumor cell interaction.
During meiotic prophase I, interactions between maternal and paternal chromosomes, under checkpoint surveillance, establish connections between homologs that promote their accurate distribution to meiotic progeny. In human, faulty meiosis causes aneuploidy resulting in miscarriages and genetic diseases. Meiotic processes occur in the context of chromatin; therefore, histone post-translational modifications are expected to play important roles. Here, we report the cytological distribution of the evolutionarily conserved DOT1L methyltransferase and the different H3K79 methylation states resulting from its activity (mono-, di- and tri-methylation; H3K79me1, me2 and me3, respectively) during meiotic prophase I in mouse spermatocytes. In the wild type, whereas low amounts of H3K79me1 are rather uniformly present throughout prophase I, levels of DOT1L, H3K79me2 and H3K79me3 exhibit a notable increase from pachynema onwards, but with differential subnuclear distribution patterns. The heterochromatic centromeric regions and the sex body are enriched for H3K79me3. In contrast, H3K79me2 is present all over the chromatin, but is largely excluded from the sex body despite the accumulation of DOT1L. In meiosis-defective mouse mutants, the increase of DOT1L and H3K79me is blocked at the same stage where meiosis is arrested. H3K79me patterns, combined with the cytological analysis of the H3.3, γH2AX, macroH2A and H2A.Z histone variants, are consistent with a differential role for these epigenetic marks in male mouse meiotic prophase I. We propose that H3K79me2 is related to transcriptional reactivation on autosomes during pachynema, whereas H3K79me3 may contribute to the maintenance of repressive chromatin at centromeric regions and the sex body.
What is the general function of H3K79 methylation?
The heterochromatic centromeric regions and the sex body are enriched for H3K79me3
Hyperbilirubinemia may arise due to inadequate clearance of bilirubin from the body. Bilirubin elimination is a multifaceted process consisting of uptake of bilirubin into the hepatocytes facilitated by OATP1B1 and OATP1B3. Once in the hepatocytes, it is extensively glucuronidated by UGT1A1. Eventually, the glucuronide metabolite is excreted into the bile via MRP2. UGT1A1 inhibition has been previously shown to be linked with hyperbilirubinemia. However, because drug transporters also contribute to bilirubin elimination, the purpose of this work was to investigate the in vitro inhibition of OATP1B1, OATP1B3, MRP2, and BSEP of select test drugs known to elicit hyperbilirubinemia. Test drugs investigated in this study were atazanavir and indinavir, which are associated with hyperbilirubinemia and elevations in serum transaminase; ritonavir and nelfinavir, which are not associated with hyperbilirubinemia; and bromfenac, troglitazone, and trovafloxacin, which are associated with severe idiosyncratic hepatotoxicity exhibiting elevations in serum bilirubin and transaminase. Due to limited solubility and poor ionization of bilirubin and its glucuronide, the formation of estradiol 3-glucuronide was used as a surrogate to assess UGT1A1 activity, while the transport of pitavastatin, CDCF, and taurocholate were used as surrogate probe substrates to monitor the function of OATP1B1/OATP1B3, MRP2, and BSEP, respectively. It was assumed that any inhibition of the surrogate probe substrates by test drugs is indicative of the potential impact of test drugs to modulate the function of proteins involved in bilirubin disposition. In vitro inhibition was determined by calculating IC50. Moreover, Cmax and Cmax,free were integrated with IC50 values to calculate R and Rfree, respectively, which represents the ratio of probe drug glucuronidation/transport in the absence and presence of test drugs. Analysis of the data showed that Rfree demonstrated the best correlation to hyperbilirubinemia. Specifically, Rfree was above the 1.1 target threshold against UGT1A1, OATP1B1, and BSEP for atazanavir and indinavir. In contrast, Rfree was below this threshold for ritonavir and nelfinavir as well as for bromfenac, troglitazone, and trovafloxacin. For all test drugs examined, only minor inhibition against OATP1B3 and MRP2 were observed. These data suggest that the proposed surrogate probe substrates to evaluate the in vitro inhibition of UGT1A1, OATP1B1, and BSEP may be suitable to assess bilirubin disposition. For protease inhibitors, inclusion of OATP1B1 and BSEP inhibition may improve the predictability of hyperbilirubinemia.
Are OATP1B1 and OATP1B3 associated with bilirubin transport?
However, because drug transporters also contribute to bilirubin elimination, the purpose of this work was to investigate the in vitro inhibition of OATP1B1, OATP1B3, MRP2, and BSEP of select test drugs known to elicit hyperbilirubinemia.
Meigs' syndrome is a benign ovarian tumor associated with ascites and pleural effusion. Elevated cancer antigen 125 (CA-125) in Meigs' syndrome is an unusual clinical condition reported in few cases. We report here on a 61-year-old woman who presented with dyspnea; in imaging assessment, a heterogeneous pelvic mass measuring 12 × 11 cm with ascitic fluid was reported. Pleural effusion was detected on Chest X-ray. Aspiration of pleural fluid showed no evidence of malignancy. CA-125 level was 347 IU/mL. The patient underwent laparotomy during which a mass measuring 12 × 11 cm was detected in her left adnexa. Histology showed ovarian thecoma. The mass was resected, and, after that, the symptoms disappeared and CA-125 level reached 19 IU/mL. The patient had experienced no problem after 12 months of follow up. Although postmenopausal women with ovarian tumor, ascites, pleural effusion, and elevation of CA-125 levels probably have malignant ovarian tumors, Meigs' syndrome must be considered in the differential diagnosis.
List symptoms of Meigs' Syndrome.
Although postmenopausal women with ovarian tumor, ascites, pleural effusion, and elevation of CA-125 levels probably have malignant ovarian tumors, Meigs' syndrome must be considered in the differential diagnosis.
Patients with systemic lupus erythematosus (SLE) have a markedly increased risk to develop cardiovascular disease, and traditional cardiovascular risk factors fail to account for this increased risk. We used microarray to probe the platelet transcriptome in patients with SLE and healthy controls, and the gene and protein expression of a subset of differentially expressed genes was further investigated and correlated to platelet activation status. Real-time PCR was used to confirm a type I interferon (IFN) gene signature in patients with SLE, and the IFN-regulated proteins PRKRA, IFITM1 and CD69 (P < .0001) were found to be up-regulated in platelets from SLE patients compared with healthy volunteers. Notably, patients with a history of vascular disease had increased expression of type I IFN-regulated proteins as well as more activated platelets compared with patients without vascular disease. We suggest that interferogenic immune complexes stimulate production of IFNα that up-regulates the megakaryocytic type I IFN-regulated genes and proteins. This could affect platelet activation and contribute to development of vascular disease in SLE. In addition, platelets with type I IFN signature could be a novel marker for vascular disease in SLE.
Which is the main gene signature in Systemic Lupus Erythematosus (SLE)?
In addition, platelets with type I IFN signature could be a novel marker for vascular disease in SLE.
Flecainide is recommended as a first-line antiarrhythmic drug to maintain normal sinus rhythm in patients with atrial fibrillation (AF) who have structurally normal hearts or hypertension without left ventricular hypertrophy. Flecainide is a sodium channel blocker with minimal effects expected on ventricular repolarization. We describe the case of a 32-year-old man with a structurally normal heart and persistent AF who was started on diltiazem and flecainide 50 mg twice/day approximately a year prior to presentation. Due to persistent and bothersome symptoms, his dose was increased to 150 mg twice/day, which was associated with a progressive lengthening of his corrected QT interval. On the day of presentation, he underwent an exercise test as part of his job requirements. While running, he felt lightheaded and experienced a syncopal event and cardiac arrest. An automated external defibrillator was available that displayed polymorphic ventricular tachycardia. The patient was successfully resuscitated. Although rare, this case suggests that flecainide can induce QT prolongation leading to torsades de pointes. Clinicians should be aware and consider periodic evaluations with electrocardiograms.
Which is the main target of the anti-arrhythmic activity of flecainide?
Flecainide is a sodium channel blocker with minimal effects expected on ventricular repolarization.
One hallmark of Ewing's sarcoma/peripheral neuroectodermal tumors is the presence of the Ews/Fli-1 chimeric oncogene. Interestingly, infection of neuroblastoma tumor cell lines with Ews/Fli-1 switches the differentiation program of neuroblastomas to Ewing's sarcoma/peripheral neuroectodermal tumors. Here we examined the status of cytoplasmically sequestered wt-p53 in neuroblastomas after stable expression of Ews/Fli-1. Immunofluorescence revealed that in the neuroblastoma-Ews/Fli-1 infectant cell lines, p53 went from a punctate-pattern of cytoplasmic sequestration to increased nuclear localization. Western blot analysis revealed that PARC was down-regulated in one neuroblastoma cell line but not expressed in the second. Therefore, decreased PARC expression could not fully account for relieving p53 sequestration in the neuroblastoma tumor cells. Neuroblastoma-Ews/Fli-1 infectant cell lines showed marked increases in p53 protein expression without transcriptional up-regulation. Interestingly, p53 was primarily phosphorylated, without activation of its downstream target p21(WAF1). Western blot analysis revealed that whereas MDM2 gene expression does not change, p14(ARF), a negative protein regulator of MDM2, increases. These observations suggest that the downstream p53 pathway may be inactivated as a result of abnormal p53. We also found that p53 has an extended half-life in the neuroblastoma-Ews/Fli-1 infectants despite the retention of a wild-type sequence in neuroblastoma-Ews/Fli-1 infectant cell lines. We then tested the p53 response pathway and observed that the neuroblastoma parent cells responded to genotoxic stress, whereas the neuroblastoma-Ews/Fli-1 infectants did not. These results suggest that Ews/Fli-1 can directly abrogate the p53 pathway to promote tumorigenesis. These studies also provide additional insight into the relationship among the p53 pathway proteins.
Which are the genes thought to be regulated by EWS/FLI?
We then tested the p53 response pathway and observed that the neuroblastoma parent cells responded to genotoxic stress, whereas the neuroblastoma-Ews/Fli-1 infectants did not. These results suggest that Ews/Fli-1 can directly abrogate the p53 pathway to promote tumorigenesis
It is feasible to provide treatment to women veterans living in rural areas by utilizing video-teleconferencing technology between larger VA medical centers and facilities at CBOCs in more rural settings. A controlled trial of the intervention is warranted.
Are there telemedicine applications for chronic pain management?
It is feasible to provide treatment to women veterans living in rural areas by utilizing video-teleconferencing technology between larger VA medical centers and facilities at CBOCs in more rural settings
Ghrelin, the only known orexigenic gut hormone, is secreted mainly from the stomach, increases with fasting and before meal initiation in humans and rats, and increases food intake after central or peripheral administration. To investigate sex differences in the action of ghrelin, we assessed the effects of exogenous ghrelin in intact male and female rats, the effects of exogenous ghrelin in ovariectomized (OVX) and estradiol (E2)-treated female rats, as well as the effects of OVX on plasma ghrelin and hypothalamic orexigneic neuropeptide expression in rats and on food intake and weight gain in transgenic mice lacking the ghrelin receptor (Ghsr(-/-) mice). Male and OVX female rats were significantly more sensitive than intact female rats to the orexigenic effects of both centrally (intra-third ventricular, i3vt, 0.01, 0.1, and 1.0 nmol) and systemically (ip, 3, 6, and 9 nmol) administered ghrelin. This difference is likely to be estradiol dependent because E2 attenuated the orexigenic action of ghrelin in OVX female and male rats. Furthermore, OVX increased food intake and body weight in wild-type mice, but not in Ghsr(-/-) mice, suggesting that OVX increases food intake by releasing ghrelin from a tonic inhibitory effect of estradiol. In addition, following OVX, there was an increase in plasma ghrelin that was temporally associated with increased food intake, body weight, and hypothalamic neuropeptide Y and Agouti-related protein mRNA expression. Collectively, these data suggest that estradiol inhibits the orexigenic action of ghrelin in females, that weight gain associated with OVX is ghrelin mediated, and that this endocrine interaction may account for an important sex differences in food intake and the regulation of body weight.
Where in the body, is ghrelin secreted?
Ghrelin, the only known orexigenic gut hormone, is secreted mainly from the stomach, increases with fasting and before meal initiation in humans and rats, and increases food intake after central or peripheral administration.
From 1986 to 1989, 23 adult patients (average age, 70 yr) with idiopathic chronic hydrocephalus received shunts with medium-pressure Pudenz-Schulte valves for suspected normal pressure hydrocephalus. Prospective clinical and computed tomographic monitoring was continued for at least 5 years. We observed the formation of a hypodense subdural collection in each of 10 patients (43%). Those collections that occurred early, i.e., within the first 9 postoperative days, evolved differently from those that occurred late; only early hypodense collections became subdural hematomas (three cases). In one case, a subdural hematoma was already present 9 days after surgery, so that four patients (17%) presented a subdural hematoma within the first 2 postoperative months. Our long-term follow-up revealed three patients (13%) with hypodense subdural collections, which appeared more than 2 months after surgery. None of the collection evolved into a subdural hematoma. Thirteen patients (57%) died between 9 and 68 months (average, 20 mo) after surgery, most often of an ischemic stroke. During the 1st postoperative year, there was improvement in the condition of 22 patients (96%) who had received a ventricular shunt; 21 of these patients (91%) remained improved until death or for at least 5 years.
Does ventriculoperitoneal shunt improve normal pressure hydrocephalus?
During the 1st postoperative year, there was improvement in the condition of 22 patients (96%) who had received a ventricular shunt; 21 of these patients (91%) remained improved until death or for at least 5 years.
A major challenge in text mining for biomedicine is automatically extracting protein-protein interactions from the vast amount of biomedical literature. We have constructed an information extraction system based on the Hidden Vector State (HVS) model for protein-protein interactions. The HVS model can be trained using only lightly annotated data whilst simultaneously retaining sufficient ability to capture the hierarchical structure. When applied in extracting protein-protein interactions, we found that it performed better than other established statistical methods and achieved 61.5% in F-score with balanced recall and precision values. Moreover, the statistical nature of the pure data-driven HVS model makes it intrinsically robust and it can be easily adapted to other domains.
Which are the available biomedical text mining tools for the detection of protein-protein interactions?
We have constructed an information extraction system based on the Hidden Vector State (HVS) model for protein-protein interactions.
Circular RNAs (circRNAs) are a novel class of regulatory RNAs that despite being relatively abundant have only recently begun to be explored. There are many thousands of genes that appear capable of producing circRNAs, however the function of all but a handful remain to be determined. What is emerging about these highly conserved molecules is that they play important roles in biology and cancer biology in particular. The most explored function of circRNAs is as master regulators of gene expression that act to sequester or ´sponge´ other gene expression regulators, in particular miRNAs. They have also been demonstrated to function via direct modulation of transcription, and by interfering with splicing mechanisms. Although generally expressed in low abundance when compared to their linear counterparts, they are often expressed in a tissue- and developmental stage- specific manner. Coupled with their remarkable resistance to RNAse activity due to a covalent closed cyclic structure, circRNAs show great promise as novel biomarkers of cancer and other diseases. In this review we consider the current state of knowledge regarding these molecules, their synthesis, function, and association with cancer. We will also review some of the challenges that remain to be resolved if this emerging class of RNAs are really to become useful in the clinic.
What is the function of Circular RNA (circRNA)?
The most explored function of circRNAs is as master regulators of gene expression that act to sequester or ´sponge´ other gene expression regulators, in particular miRNAs.
The Y-linked autoimmune accelerating gene mutation (yaa), first discovered in the BXSB mouse strain, is known to accelerate spontaneous autoantibody production and subsequent development of lupus disease. We have investigated the role of the yaa gene in the development of the type II collagen (CII)-induced arthritis (CIA), which is used as a model for rheumatoid arthritis. In contrast to the accelerating effects on development of lupus autoimmunity we can show that the presence of BXSB Y chromosome carrying the yaa gene block development of CIA in F1 crosses with three normally CIA-susceptible strains, DBA/1, C3H.Q and B10.Q. Backcross experiments showed an additional modulatory effect from other BXSB genes or possibly from DBA/1 X chromosome. To evaluate the effect mediated by the yaa gene alone, the BXSB Y chromosome was bred into the DBA/1 gene background. The DBA/1 congenic DBA/1.yaa male mice were less susceptible to arthritis development than their DBA/1 counterparts. (B10.QxDBA/1.yaa)F1 acquired resistance to arthritis development similar to that of DBA/1.yaa, indicating a role for the yaa gene alone. The serum levels of autoantibodies to CII were significantly suppressed in all strains carrying yaa. In DBA/1.yaa mice a reduced number of T cells were found to produce interferon-gamma after in vitro stimulation with CII. Thus, although autoreactive B cells are important in both diseases they play different roles in murine lupus and in CIA.
Which diseases are associated with the Yaa gene?
The Y-linked autoimmune accelerating gene mutation (yaa), first discovered in the BXSB mouse strain, is known to accelerate spontaneous autoantibody production and subsequent development of lupus disease. We
Cellular entry is an important step preceding intracellular metabolism and action of thyroid hormone (TH). Transport of TH across the plasma membrane does not take place by simple diffusion but requires transporter proteins. One of the most effective and specific TH transporters identified to date is monocarboxylate transporter 8 (MCT8), the gene of which is located on the X chromosome. Although MCT8 is expressed in many tissues, its function appears to be most critical in the brain. Hemizygous MCT8 mutations in males cause severe psychomotor retardation, known as the Allan-Herndon-Dudley syndrome (AHDS), and abnormal serum TH levels. AHDS thus represents a type of TH resistance caused by a defect in cellular TH transport.
Which hormone concentrations are altered in patients with the Allan–Herndon–Dudley syndrome?
Hemizygous MCT8 mutations in males cause severe psychomotor retardation, known as the Allan-Herndon-Dudley syndrome (AHDS), and abnormal serum TH levels.
This article presents the design and applications of a rescue terminal with positioning, vital signs sensing, and communicating function for special environment. The terminal provides three-dimensional positioning functionality via China's Beidou 1 Navigation Satellite (BD1) System and can collect users' vital signs with a set of wireless sensors. A controller of the terminal is in charge of processing data collected from the wireless sensors and communicating with the monitoring platform. With features such as small sizing, low power consumption, and accurate positioning, this terminal is very helpful in special circumstances such as disaster relief, dangerous outdoor sports and adventure monitoring, and antiterrorism activities.
List tele monitoring applications of miniaturised sensors
System and can collect users' vital signs with a set of wireless sensors
Dominant intermediate Charcot-Marie-Tooth neuropathy type B is caused by mutations in dynamin 2. We studied the clinical, haematological, electrophysiological and sural nerve biopsy findings in 34 patients belonging to six unrelated dominant intermediate Charcot-Marie-Tooth neuropathy type B families in whom a dynamin 2 mutation had been identified: Gly358Arg (Spain); Asp551_Glu553del; Lys550fs (North America); Lys558del (Belgium); Lys558Glu (Australia, the Netherlands) and Thr855_Ile856del (Belgium). The Gly358Arg and Thr855_Ile856del mutations were novel, and in contrast to the other Charcot-Marie-Tooth-related mutations in dynamin 2, which are all located in the pleckstrin homology domain, they were situated in the middle domain and proline-rich domain of dynamin 2, respectively. We report the first disease-causing mutation in the proline-rich domain of dynamin 2. Patients with a dynamin 2 mutation presented with a classical Charcot-Marie-Tooth phenotype, which was mild to moderately severe since only 3% of the patients were wheelchair-bound. The mean age at onset was 16 years with a large variability ranging from 2 to 50 years. Interestingly, in the Australian and Belgian families, which carry two different mutations affecting the same amino acid (Lys558), Charcot-Marie-Tooth cosegregated with neutropaenia. In addition, early onset cataracts were observed in one of the Charcot-Marie-Tooth families. Our electrophysiological data indicate intermediate or axonal motor median nerve conduction velocities (NCV) ranging from 26 m/s to normal values in four families, and less pronounced reduction of motor median NCV (41-46 m/s) with normal amplitudes in two families. Sural nerve biopsy in a Dutch patient with Lys558Glu mutation showed diffuse loss of large myelinated fibres, presence of many clusters of regenerating myelinated axons and fibres with focal myelin thickenings--findings very similar to those previously reported in the Australian family. We conclude that dynamin 2 mutations should be screened in the autosomal dominant Charcot-Marie-Tooth neuropathy families with intermediate or axonal NCV, and in patients with a classical mild to moderately severe Charcot-Marie-Tooth phenotype, especially when Charcot-Marie-Tooth is associated with neutropaenia or cataracts.
Which genes are associated with autosomal dominant Charcot-Marie-Tooth?
We conclude that dynamin 2 mutations should be screened in the autosomal dominant Charcot-Marie-Tooth neuropathy families with intermediate or axonal NCV, and in patients with a classical mild to moderately severe Charcot-Marie-Tooth phenotype, especially when Charcot-Marie-Tooth is associated with neutropaenia or cataracts.
The SILVER locus has been mapped in the domestic cat, identifying a unique genomic location distinct from that of any known reported gene associated with silver or hypopigmentation in mammals. A demonstrated lack of linkage to SILV, the strong candidate gene for silver, led to the initiation of a genome scan utilizing 2 pedigrees segregating for silver coat color. Linkage mapping defined a genomic region for SILVER as a 3.3-Mb region, (95.87-99.21 Mb) on chromosome D2, (peak logarithm of the odds = 10.5, = 0), which displays conserved synteny to a genomic interval between 118.58 and 121.85 Mb on chromosome 10 in the human genome. In the domestic cat, mutations at the SILVER locus suppress the development of pigment in the hair, but in contrast to other mammalian silver variants, there is an apparently greater influence on the production of pheomelanin than eumelanin pigment. The mapping of a novel locus for SILVER offers much promise in identifying a gene that may help elucidate aspects of pheomelanogenesis, a pathway that has been very elusive, and illustrates the promise of the cat genome project in increasing our understanding of basic biological processes of general relevance for mammals.
On what chromosome is the gene for "SILVER" coat color found for the domestic cat?
Linkage mapping defined a genomic region for SILVER as a 3.3-Mb region, (95.87-99.21 Mb) on chromosome D2, (peak logarithm of the odds = 10.5, = 0), which displays conserved synteny to a genomic interval between 118.58 and 121.85 Mb on chromosome 10 in the human genome.
bZip and bHLHZip protein family members comprise a large fraction of eukaryotic transcription factors and need to bind DNA in order to exert most of their fundamental biological roles. Their binding to DNA requires homo- or heterodimerization via alpha-helical domains, which generally do not contain obvious binding sites for small molecules. We have identified two small molecules, dubbed Mycro1 and Mycro2, which inhibit the protein-protein interactions between the bHLHZip proteins c-Myc and Max. Mycros are the first inhibitors of c-Myc/Max dimerization, which have been demonstrated to inhibit DNA binding of c-Myc with preference over other dimeric transcription factors in vitro. Mycros inhibit c-Myc-dependent proliferation, gene transcription, and oncogenic transformation in the low micromolar concentration range. Our data support the idea that dimeric transcription factors can be druggable even in the absence of obvious small-molecule binding pockets.
Which small molecules inhibit the c-Myc/Max dimerization?
ave identified two small molecules, dubbed Mycro1 and Mycro2, which inhibit the protein-protein interactions between the bHLHZip proteins c-Myc and Max. Mycr
MITF governs multiple steps in the development of melanocytes, including specification from neural crest, growth, survival, and terminal differentiation. In addition, the level of MITF activity determines the phenotype adopted by melanoma cells, whether invasive, proliferative, or differentiated. However, MITF does not act alone. Here, we review literature on the transcription factors that co-regulate MITF-dependent genes. ChIP-seq studies have indicated that the transcription factors SOX10, YY1, and TFAP2A co-occupy subsets of regulatory elements bound by MITF in melanocytes. Analyses at single loci also support roles for LEF1, RB1, IRF4, and PAX3 acting in combination with MITF, while sequence motif analyses suggest that additional transcription factors colocalize with MITF at many melanocyte-specific regulatory elements. However, the precise biochemical functions of each of these MITF collaborators and their contributions to gene expression remain to be elucidated. Analogous to the transcriptional networks in morphogen-patterned tissues during embryogenesis, we anticipate that the level of MITF activity is controlled not only by the concentration of activated MITF, but also by additional transcription factors that either quantitatively or qualitatively influence the expression of MITF-target genes.
Which transcription factors are essential for the melanocyte lineage?
However, MITF does not act alone.
The mammalian radiation has corresponded with rapid changes in noncoding regions of the genome, but we lack a comprehensive understanding of regulatory evolution in mammals. Here, we track the evolution of promoters and enhancers active in liver across 20 mammalian species from six diverse orders by profiling genomic enrichment of H3K27 acetylation and H3K4 trimethylation. We report that rapid evolution of enhancers is a universal feature of mammalian genomes. Most of the recently evolved enhancers arise from ancestral DNA exaptation, rather than lineage-specific expansions of repeat elements. In contrast, almost all liver promoters are partially or fully conserved across these species. Our data further reveal that recently evolved enhancers can be associated with genes under positive selection, demonstrating the power of this approach for annotating regulatory adaptations in genomic sequences. These results provide important insight into the functional genetics underpinning mammalian regulatory evolution.
What type of sequences do enhancers evolve from?
Most of the recently evolved enhancers arise from ancestral DNA exaptation, rather than lineage-specific expansions of repeat elements.
Tay-Sachs disease is an autosomal recessive genetic disorder resulting from mutation of the HEXA gene encoding the alpha-subunit of the lysosomal enzyme, beta-N-acetylhexosaminidase A (ref. 1). A relatively high frequency of carriers (1/27) of a lethal, infantile form of the disease is found in the Ashkenazi Jewish population, but it is not yet evident whether this has resulted from a founder effect and random genetic drift or from a selective advantage of heterozygotes. We have identified a single-base mutation in a cloned fragment of the HEXA gene from an Ashkenazi Jewish patient. This change, the substitution of a C for G in the first nucleotide of intron 12 is expected to result in defective splicing of the messenger RNA. A test for the mutant allele based on amplification of DNA by the 'polymerase chain rection and cleavage of a DdeI restriction site generated by the mutation revealed that this case and two other cases of the Ashkenazi, infantile form of Tay-Sachs disease are heterozygous for two different mutations. The occurrence of multiple mutant alleles warrants further examination of the selective advantage hypothesis.
Which is the gene most commonly mutated in Tay-Sachs disease?
ay-Sachs disease is an autosomal recessive genetic disorder resulting from mutation of the HEXA gene encoding the alpha-subunit of the lysosomal enzyme, beta-N-acetylhexosaminidase A
Treatment of hepatitis C patients with direct-acting antiviral drugs involves the combination of multiple small-molecule inhibitors of distinctive mechanisms of action. ACH-806 (or GS-9132) is a novel, small-molecule inhibitor specific for hepatitis C virus (HCV). It inhibits viral RNA replication in HCV replicon cells and was active in genotype 1 HCV-infected patients in a proof-of-concept clinical trial (1). Here, we describe a potential mechanism of action (MoA) wherein ACH-806 alters viral replication complex (RC) composition and function. We found that ACH-806 did not affect HCV polyprotein translation and processing, the early events of the formation of HCV RC. Instead, ACH-806 triggered the formation of a homodimeric form of NS4A with a size of 14 kDa (p14) both in replicon cells and in Huh-7 cells where NS4A was expressed alone. p14 production was negatively regulated by NS3, and its appearance in turn was associated with reductions in NS3 and, especially, NS4A content in RCs due to their accelerated degradation. A previously described resistance substitution near the N terminus of NS3, where NS3 interacts with NS4A, attenuated the reduction of NS3 and NS4A conferred by ACH-806 treatment. Taken together, we show that the compositional changes in viral RCs are associated with the antiviral activity of ACH-806. Small molecules, including ACH-806, with this novel MoA hold promise for further development and provide unique tools for clarifying the functions of NS4A in HCV replication.
Are there any HCV replication inhibitors available?
ACH-806 (or GS-9132) is a novel, small-molecule inhibitor specific for hepatitis C virus (HCV).
Duchenne muscular dystrophy (DMD) is among the most common lethal genetic diseases. It has been proposed that genetic counseling and prenatal diagnosis have begun to lower the incidence. We reviewed the records of all patients with confirmed DMD who were born between 1969 and 2008. Statistics Canada data on annual male births in Nova Scotia were obtained for each year.The overall incidence of 1 per 4700 male births remained stable during the 30-year period of the study. Similarly, the age at diagnosis did not change during that time.
What is the incidence of Duchenne Muscular Dystrophy?
Statistics Canada data on annual male births in Nova Scotia were obtained for each year.The overall incidence of 1 per 4700 male births remained stable during the 30-year period of the study.
Classical drug assays are often confined to single molecules and targeting single pathways. However, it is also desirable to investigate the effects of complex mixtures on complex systems such as living cells including the natural multitude of signalling pathways. Evidence based on herbal medicine has motivated us to investigate potential beneficial health effects of Mucor racemosus (M rac) extracts. Secondary metabolites of M rac were collected using a good-manufacturing process (GMP) approved production line and a validated manufacturing process, in order to obtain a stable product termed SyCircue (National Drug Code USA: 10424-102). Toxicological studies confirmed that this product does not contain mycotoxins and is non-genotoxic. Potential effects on inflammatory processes were investigated by treating stimulated cells with M rac extracts and the effects were compared to the standard anti-inflammatory drug dexamethasone on the levels of the proteome and metabolome. Using 2D-PAGE, slight anti-inflammatory effects were observed in primary white blood mononuclear cells, which were more pronounced in primary human umbilical vein endothelial cells (HUVECs). Proteome profiling based on nLC-MS/MS analysis of tryptic digests revealed inhibitory effects of M rac extracts on pro-inflammatory cytoplasmic mediators and secreted cytokines and chemokines in these endothelial cells. This finding was confirmed using targeted proteomics, here treatment of stimulated cells with M rac extracts down-regulated the secretion of IL-6, IL-8, CXCL5 and GROA significantly. Finally, the modulating effects of M rac on HUVECs were also confirmed on the level of the metabolome. Several metabolites displayed significant concentration changes upon treatment of inflammatory activated HUVECs with the M rac extract, including spermine and lysophosphatidylcholine acyl C18:0 and sphingomyelin C26:1, while the bulk of measured metabolites remained unaffected. Interestingly, the effects of M rac treatment on lipids were orthogonal to the effect of dexamethasone underlining differences in the overall mode of action.
What is the mode of action of dexamethasone?
Potential effects on inflammatory processes were investigated by treating stimulated cells with M rac extracts and the effects were compared to the standard anti-inflammatory drug dexamethasone on the levels of the proteome and metabolome
Cell migration is essential throughout embryonic and adult life. In numerous cell systems, the small GTPase Rac is required for lamellipodia formation at the leading edge and movement ability. However, the molecular mechanisms leading to Rac activation during migration are still unclear. Recently, a mammalian superfamily of proteins related to the prototype member Dock180 has been identified with homologues in Drosophila and Caenorhabditis elegans. Here, we addressed the role of Dock180 and ELMO1 proteins, which function as a complex to mediate Rac activation, in mammalian cell migration. Using mutants of Dock180 and ELMO1 in a Transwell assay as well as transgenic rescue of a C. elegans mutant lacking CED-5 (Dock180 homologue), we identified specific regions of Dock180 and ELMO1 required for migration in vitro and in a whole animal model. In both systems, the Dock180.ELMO1 complex formation and the ability to activate Rac were required. We also found that ELMO1 regulated multiple Dock180 superfamily members to promote migration. Interestingly, deletion mutants of ELMO1 missing their first 531 or first 330 amino acids that can still bind and cooperate with Dock180 in Rac activation failed to promote migration, which correlated with the inability to localize to lamellipodia. This finding suggests that Rac activation by the ELMO.Dock180 complex at discrete intracellular locations mediated by the N-terminal 330 amino acids of ELMO1 rather than generalized Rac activation plays a role in cell migration.
What is the role of ELMO1 gene in cell migration?
This finding suggests that Rac activation by the ELMO.Dock180 complex at discrete intracellular locations mediated by the N-terminal 330 amino acids of ELMO1 rather than generalized Rac activation plays a role in cell migration
Biallelic mutations in the base excision repair gene Mut Y homologue (MUTYH) are responsible for variable recessively inherited phenotypes of polyposis. Beside MUTYH, the proteins 8-oxo-guanine DNA glycosylase (OGG1) and MTH1 (or NUDT1) are also involved in the repair of 7,8-dihydro-8-oxoguanine (8-oxo-G), previous studies, however, only found missense mutations of unclear pathogenicity in either MTH1 or OGG1. To investigate the role of a defective 8-oxo-G repair we performed a germline mutation screening in the genes OGG1, MTH1 and MUTYH, in 81 patients with a clinical phenotype ranging from attenuated or atypical adenomatous polyposis coli including hyperplastic polyps to hereditary non-polyposis colorectal cancer (HNPCC) type X syndrome without mono- or biallelic mutations in either APC, MUTYH or the DNA mismatch repair genes. We describe here the first pathogenic germline mutation in OGG1, a splice site mutation affecting exon 1, which was inherited from the father, in combination with a maternal MUTYH missense mutation p.Ile223Val in a female patient with advanced synchronous colon cancer and adenomas at the age of 36 years pointing towards digenic inheritance for colorectal cancer (CRC) predisposition. Monoallelic missense mutations in MTH1 (3x), OGG1 (2x), or MUTYH (3x) were identified in 10 patients (12%), three of them were novel. Our findings indicate that mutations in other genes of the 8-oxo-G repair beside MUTYH are involved in CRC predisposition. Oligogenic inheritance affecting genes of a certain repair pathway might therefore be the missing link between monogenic and polygenic traits.
What is the function of the MTH1 enzyme in cancer cells?
MTH1 (or NUDT1) are also involved in the repair of 7,8-dihydro-8-oxoguanine (8-oxo-G), previous studies,
Renal α-Klotho (α-KL) plays a fundamental role as a co-receptor for fibroblast growth factor 23 (FGF23), a phosphaturic hormone and regulator of 1,25(OH)2 vitamin D3 (1,25VitD3). Disruption of FGF23-α-KL signaling is thought to be an early hallmark of chronic kidney disease (CKD) involving reduced renal α-KL expression and a reciprocal rise in serum FGF23. It remains unclear, however, whether the rise in FGF23 is related to the loss of renal α-KL. We evaluated α-KL expression in renal biopsy samples and measured levels of several parameters of mineral metabolism, as well as soluble α-KL (sKL), in serum and urinary samples from CKD patients (n = 236). We found that although renal α-KL levels were significantly reduced and serum FGF23 levels were significantly elevated in early and intermediate CKD, serum phosphate levels remained within the normal range. Multiple regression analysis showed that the increases in FGF23 were significantly associated with reduced renal function and elevated serum phosphate, but were not associated with loss of renal α-KL. Moreover, despite falling renal α-KL levels, the increase in FGF23 enhanced urinary fractional excretion of phosphate and reduced serum 1,25VitD3 levels in early and intermediate CKD, though not in advanced CKD. Serum sKL levels also fell significantly over the course of CKD, and renal α-KL was a significant independent determinant of sKL. These results demonstrate that FGF23 levels rise to compensate for renal failure-related phosphate retention in early and intermediate CKD. This enables FGF23-α-KL signaling and a neutral phosphate balance to be maintained despite the reduction in α-KL. In advanced CKD, however, renal α-KL declines further. This disrupts FGF23 signaling, and serum phosphate levels significantly increase, stimulating greater FGF23 secretion. Our results also suggest the serum sKL concentration may be a useful marker of renal α-KL expression levels.
Is Fibroblast Growth Factor 23 a phosphaturic hormone?
fibroblast growth factor 23 (FGF23), a phosphaturic hormone and regulator of 1,25(OH)2 vitamin D3 (1,25VitD3).
Von Hippel-Lindau disease (VHL disease) is a hereditary cancer predisposition syndrome caused by mutations of the von Hippel-Lindau tumor suppressor gene. The gene product, pVHL, regulates the level of proteins that play a central role in protecting cells against hypoxia. Clinical hallmarks of von Hippel-Lindau disease are the development of central nervous system hemangioblastomas, renal cell carcinoma, pheochromocytoma, neuroendocrine tumors and endolymphatic sac tumors.In this article the case of a 38-year old hemodialyzed patient who became ill with acute myeloid leukemia (AML) three years after being diagnosed with von Hippel-Lindau disease is presented.After cytostatic treatment the patient went into complete hematologic remission but there was still residual disease at the genetic level. After consolidation therapy patient developed bone marrow aplasia and severe pneumonia. Despite intensive treatment the patient died from acute respiratory failure.In this paper we present for the first time a case of von Hippel-Lindau disease associated with acute myeloid leukemia. No evidence of relationship between VHL disease and blood cancers has been demonstrated so far. Despite the fact that there is an increased risk of cancer development in hemodialyzed patients, cancer is a relatively rare cause of death in the dialysed population, and the most common malignancies are genitourinary cancers. It seems likely that development of acute myeloid leukemia in patient with VHL disease can be related to epigenetic alterations of the VHL gene, but further studies are needed.
What is known as Von Hippel–Lindau disease or syndrome?
Von Hippel-Lindau disease (VHL disease) is a hereditary cancer predisposition syndrome caused by mutations of the von Hippel-Lindau tumor suppressor gene.
The Mis18 complex has been identified as a critical factor for the centromeric localization of a histone H3 variant, centromeric protein A (CENP-A), which is responsible for the specification of centromere identity in the chromosome. However, the functional role of Mis18 complex is largely unknown. Here, we generated Mis18α conditional knockout mice and found that Mis18α deficiency resulted in lethality at early embryonic stage with severe defects in chromosome segregation caused by mislocalization of CENP-A. Further, we demonstrate Mis18α's crucial role for epigenetic regulation of centromeric chromatin by reinforcing centromeric localization of DNMT3A/3B. Mis18α interacts with DNMT3A/3B, and this interaction is critical for maintaining DNA methylation and hence regulating epigenetic states of centromeric chromatin. Mis18α deficiency led to reduced DNA methylation, altered histone modifications, and uncontrolled noncoding transcripts in centromere region by decreased DNMT3A/3B enrichment. Together, our findings uncover the functional mechanism of Mis18α and its pivotal role in mammalian cell cycle.
What is the function of the Mis18 protein?
Together, our findings uncover the functional mechanism of Mis18α and its pivotal role in mammalian cell cycle.
Respirasomes are macromolecular assemblies of the respiratory chain complexes I, III and IV in the inner mitochondrial membrane. We determined the structure of supercomplex IIIIIV from bovine heart mitochondria by cryo-EM at 9 Å resolution. Most protein-protein contacts between complex I, III and IV in the membrane are mediated by supernumerary subunits. Of the two Rieske iron-sulfur cluster domains in the complex III dimer, one is resolved, indicating that this domain is immobile and unable to transfer electrons. The central position of the active complex III monomer between complex I and IV in the respirasome is optimal for accepting reduced quinone from complex I over a short diffusion distance of 11 nm, and delivering reduced cytochrome to complex IV. The functional asymmetry of complex III provides strong evidence for directed electron flow from complex I to complex IV through the active complex III monomer in the mammalian supercomplex.
Where is the respirasome located?
Respirasomes are macromolecular assemblies of the respiratory chain complexes I, III and IV in the inner mitochondrial membrane.
The E3 ubiquitin ligase CHIP (C-terminus of Hsc70-interacting protein) is believed to be a central player in the cellular triage decision, as it links the molecular chaperones Hsp70/Hsc70 and Hsp90 to the ubiquitin proteasomal degradation pathway. To better understand the decision process, we determined the affinity of CHIP for Hsp70 and Hsp90 using isothermal titration calorimetry. We analyzed the influence of CHIP on the ATPase cycles of both chaperones in the presence of co-chaperones and a substrate, and determined the ubiquitination efficacy of CHIP in the presence of the chaperones. We found that CHIP has a sixfold higher affinity for Hsp90 compared with Hsc70. CHIP had no influence on ADP dissociation or ATP association, but reduced the Hsp70 cochaperone Hdj1-stimulated single-turnover ATPase rates of Hsc70 and Hsp70. CHIP did not influence the ATPase cycle of Hsp90 in the absence of co-chaperones or in the presence of the Hsp90 cochaperones Aha1 or p23. Polyubiquitination of heat-denatured luciferase and the native substrate p53 was much more efficient in the presence of Hsc70 and Hdj1 than in the presence of Hsp90, indicating that CHIP preferentially ubiquitinates Hsp70-bound substrates.
Which is the E3 ubiquitin ligase of Hsp90?
The E3 ubiquitin ligase CHIP (C-terminus of Hsc70-interacting protein) is believed to be a central player in the cellular triage decision, as it links the molecular chaperones Hsp70/Hsc70 and Hsp90 to the ubiquitin proteasomal degradation pathway.
Ohdo syndrome comprises a heterogeneous group of disorders characterized by intellectual disability (ID) and typical facial features, including blepharophimosis. Clinically, these blepharophimosis-ID syndromes have been classified in five distinct subgroups, including the Maat-Kievit-Brunner (MKB) type, which, in contrast to the others, is characterized by X-linked inheritance and facial coarsening at older age. We performed exome sequencing in two families, each with two affected males with Ohdo syndrome MKB type. In the two families, MED12 missense mutations (c.3443G>A [p.Arg1148His] or c.3493T>C [p.Ser1165Pro]) segregating with the phenotype were identified. Upon subsequent analysis of an additional cohort of nine simplex male individuals with Ohdo syndrome, one additional de novo missense change (c.5185C>A [p.His1729Asn]) in MED12 was detected. The occurrence of three different hemizygous missense mutations in three unrelated families affected by Ohdo syndrome MKB type shows that mutations in MED12 are the underlying cause of this X-linked form of Ohdo syndrome. Together with the recently described KAT6B mutations resulting in Ohdo syndrome Say/Barber/Biesecker/Young/Simpson type, our findings point to aberrant chromatin modification as being central to the pathogenesis of Ohdo syndrome.
What is the genetic basis of Ohdo syndrome?
The occurrence of three different hemizygous missense mutations in three unrelated families affected by Ohdo syndrome MKB type shows that mutations in MED12 are the underlying cause of this X-linked form of Ohdo syndrome.
Fanconi anemia (FA) consists of a group of at least five autosomal recessive disorders that share both clinical (e.g., birth defects and hematopoietic failure) and cellular (e.g., sensitivity to cross-linking agents and predisposition to apoptosis) features with each other. However, a common pathogenetic link among these groups has not been established. To identify genetic pathways that are altered in FA and characterize shared molecular defects, we used mRNA differential display to isolate genes that have altered expression patterns in FA cells. Here, we report that the expression of an interferon-inducible gene, MxA, is highly upregulated in cells of FA complementation groups A, B, C, and D, but it is suppressed in FA group C cells complemented with wild-type FAC cDNA as well as in non-FA cells. A posttranscriptional mechanism rather than transcriptional induction appears to account for MxA overexpression. Forced expression of MxA in Hep3B cells enhances their sensitivity to mitomycin C and induces apoptosis, similar to the FA phenotype. Thus, MxA is a downstream target of FAC and is the first genetic marker to be identified among multiple FA complementation groups. These data suggest that FA subtypes converge onto a final common pathway, which is intimately related to the interferon signaling mechanism. Constitutive activity of this pathway may explain a number of the phenotypic features of FA, particularly the pathogenesis of bone marrow failure.
Which are the main clinical features of Fanconi anemia?
Fanconi anemia (FA) consists of a group of at least five autosomal recessive disorders that share both clinical (e.g., birth defects and hematopoietic failure) and cellular (e.g., sensitivity to cross-linking agents and predisposition to apoptosis) features with each other.
Sacubitril/valsartan [LCZ696 (Entresto), Novartis Pharmaceuticals Corp.] is the first in a new class of drugs that combines neprilysin inhibition with angiotensin II receptor antagonism, the combination of which acts to increase endogenous natriuretic peptides while inhibiting the renin-angiotensin-aldosterone system. Sacubitril/valsartan has been studied in the treatment of hypertension, heart failure with reduced ejection fraction (HFrEF), and heart failure with preserved ejection fraction (HFpEF) and has demonstrated clinical efficacy in blood pressure reduction in hypertensive patients with and without HFpEF and a reduction in hospitalizations and mortality for patients with HFrEF. Research to evaluate clinical outcomes in HFpEF is ongoing. Sacubitril/valsartan is approved to reduce hospitalization and risk of cardiovascular death for patients with HFrEF in New York Heart Association (NYHA) functional class II-IV. The product is as well tolerated as an angiotensin-converting enzyme inhibitor, with the most common side effect being hypotension. Expectedly, it is much more costly than generic angiotensin-converting enzyme inhibitors or angiotensin receptor antagonists, which will be a factor in determining how widespread the use of this agent will be. In summary, although the number of published studies evaluating its use is limited, sacubitril/valsartan represents a promising new treatment option for patients with HFrEF. Ongoing studies will continue to refine the role of this agent in clinical practice.
Entresto is composed of which two drugs?
Sacubitril/valsartan [LCZ696 (Entresto), Novartis Pharmaceuticals Corp.] is the first in a new class of drugs that combines neprilysin inhibition with angiotensin II receptor antagonism, the combination of which acts to increase endogenous natriuretic peptides while inhibiting the renin-angiotensin-aldosterone system.
Oral hypoglycemic agent metformin is commonly used for treating type II diabetes; however, initial reports demonstrated that it could be used for suppressing tumor growth in vitro and in vivo. Moreover, novel potential anticancer drug histone deacetylase (HDAC) and inhibitor trichostatin A (TSA) have been extensively studied for inducing various malignancies growth inhibition, cell cycle arrest, and apoptosis. The object of the present study was to investigate the anti-proliferation and apoptosis induction effects of metformin and TSA in osteosarcoma cell line, and to explore the mechanism of metformin and TSA in combination to inhibit the proliferation of osteosarcoma cells. After treating with metformin and TSA, the viability of osteosarcoma cell lines (MG-63 and LM8) was analyzed by 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) at various concentrations, cell cycle analysis of MG-63 and LM8 cell was performed by flow cytometry. Real-time polymerase chain reaction and Western Blotting were performed to determine the expression of apoptosis-related genes and proteins such as Caspase-3, Bcl-2/Bax, Cyclin D1, and p21. Protein expression of the molecules involved in 5'-adenosine monophosphate-activated protein kinase (AMPK) signaling pathway after treatment with combination was determined by Western blotting. Moreover, orthotopic xenograft tumors were challenged in nude mice to establish the murine model; tumor weight and tumor volume were monitored after drug administration separately or combined via the intraperitoneal (i.p.) route. MTT assays showed that the viability of osteosarcoma cell lines in the combination group (10 mM metformin, 0.3 μM TSA) decreased in a concentration- and time-dependent manner; moreover, the cell cycle of MG-63 and LM8 in the combination group could be arrested in G1/G2 phase higher number compared with drug use separately. Furthermore, a combination of these drugs does not act via the AMPK signaling pathway to induce MG-63 osteosarcoma cell line growth inhibition and apoptosis. As data have showed here, metformin cotreatment increased TSA antitumor effects and have a synergistic effect on osteosarcoma cell line proliferation and apoptosis.
What is the mechanism of action of trichostatin A (TSA) as an antitumoral agent?
novel potential anticancer drug histone deacetylase (HDAC) and inhibitor trichostatin A (TSA)
Alzheimer's disease (AD) is a major neuropsychiatric disorder affecting more than 5 million Americans over age 65. By the year 2050, AD is expected to affect over 30 million. Characterized by neuronal cell death accompanied by the accumulation of neurofibrillary tangles and neuritic plaques, AD results in devastating clinical symptomatology with a lasting psychosocial and financial impact. Studies have shown that the current treatments for AD, cholinesterase inhibitors (ChEI's) and NMDA receptor antagonists, have limited efficacy. The 5-HT-6 receptor antagonists Idalopirdine and Intepirdine have shown the most progress in current clinical trials and warrant consideration as emerging treatments for AD. Areas covered: This review discusses 5-HT6 antagonists currently in clinical trials as potential treatments for AD symptomatology and how 5-HT6 physiology may play a positive role in alleviating AD symptom pathophysiology. A literature search using PubMed was conducted using the terms Idalopirdine, Intepirdine, 5-HT-6 antagonist, and AD as keywords. Clinicaltrials.gov and Alzforum were also used to obtain information on clinical trials. Expert opinion: If current Phase-3 trials are positive, 5-HT6 antagonists such as Idalopirdine and Intepirdine may be considered as supplementary treatments to ChEI's and NMDA receptor antagonists for the symptomatic treatment of AD.
What does intepirdine target?
If current Phase-3 trials are positive, 5-HT6 antagonists such as Idalopirdine and Intepirdine may be considered as supplementary treatments to ChEI's and NMDA receptor antagonists for the symptomatic treatment of AD.
Plasmodium falciparum is the causative agent of the most severe type of malaria, a life-threatening disease affecting the lives of over three billion people. Factors like widespread resistance against available drugs and absence of an effective vaccine are seriously compounding control of the malaria parasite. Thus, there is an urgent need for the identification and validation of new drug targets. The enzymes of the polyamine biosynthesis pathway have been suggested as possible targets for the treatment of malaria. One of these enzymes is spermidine synthase (SPDS, putrescine aminopropyltransferase), which catalyzes the transfer of an aminopropyl moiety from decarboxylated S-adenosylmethionine (dcAdoMet) to putrescine, leading to the formation of spermidine and 5'-methylthioadenosine. Here we present the three-dimensional structure of P. falciparum spermidine synthase (pfSPDS) in apo form, in complex with dcAdoMet and two inhibitors, S-adenosyl-1,8-diamino-3-thio-octane (AdoDATO) and trans-4-methylcyclohexylamine (4MCHA). The results show that binding of dcAdoMet to pfSPDS stabilizes the conformation of the flexible gatekeeper loop of the enzyme and affects the conformation of the active-site amino acid residues, preparing the protein for binding of the second substrate. The complexes of AdoDATO and 4MCHA with pfSPDS reveal the mode of interactions of these compounds with the enzyme. While AdoDATO essentially fills the entire active-site pocket, 4MCHA only occupies part of it, which suggests that simple modifications of this compound may yield more potent inhibitors of pfSPDS.
Which is the causative agent of malaria?
Plasmodium falciparum is the causative agent of the most severe type of malaria, a life-threatening disease affecting the lives of over three billion people.
Cyclophilins (CyPs) are a large class of highly conserved ubiquitous peptidyl-prolyl cis-trans isomerases. CyPs have also been identified as being a specific receptor for the immunosuppressive drug cyclosporin A and are involved in a variety of biological functions. CyPJ is a novel member of the CyP family and human CyPJ (hCyPJ) is the protein encoded by a cyclophilin-like gene from human foetal brain, which shows 50% sequence identity to human cyclophilin A (hCyPA). Recombinant hCyPJ was expressed in Escherichia coli and purified. The three-dimensional structure of hCyPJ has been determined by molecular replacement using the hCyPA structure as the search model and has been refined at 2.6 angstroms resolution. The hCyPJ molecule contains four helices and one beta-barrel composed of eight antiparallel beta-strands. The overall secondary and tertiary structures of hCyPJ are similar to those of hCyPA, but hCyPJ contains an additional disulfide bridge and four segments with conformations that are strikingly different from those of hCyPA. His43 and Gln52 of hCyPJ are expected to be the active sites based on sequence alignment with hCyPA. The hCyPJ structure shows a conserved water molecule close to His43 and Gln52 which appears to support the solvent-assisted mechanism.
Are cyclophilins ubiquitously expressed?
Cyclophilins (CyPs) are a large class of highly conserved ubiquitous peptidyl-prolyl cis-trans isomerases.
Bisphenol A, one of the industrial chemicals used in plastics and in the coating of dishes and medical equipment, behaves as an endocrine disruptor in the human body. Bisphenol A can bind directly to several types of nuclear receptors, including steroid and xenobiotic receptor (SXR). SXR plays an important role in bone metabolism through the activation of osteoblasts in vitro, but SXR protein localization has not been reported in bone tissues. Additionally, it is not known whether bisphenol A acts on osteoblasts through SXR activation. Therefore, in this study, we first examined the immunolocalization of the SXR protein in human adult and fetal bone tissues. We then examined the effects of bisphenol A on human osteoblasts in vitro. SXR immunoreactivity was detected in osteoblasts, but not in osteoclasts, of both adult and fetal bone tissues. In fetal bone tissues, the mesenchymal cells or fetal connective tissue were also positive for SXR immunoreactivity. Expression of SXR target genes (tsukushi, matrilin-2, and CYP3A4) and SXR response element-luciferase activity were increased by bisphenol A treatment in normal osteoblasts transfected with SXR (hFOB/SXR) and in osteoblast-like cells (MG-63). Bisphenol A also stimulated cell proliferation and collagen accumulation in hFOB/SXR cells. These results suggest that, as in other tissues, SXR plays important roles in bone metabolism and fetal bone development and that bisphenol A may disturb bone homeostasis in both adult and fetus through SXR.
what is the effect of Bisphenol A in the body?
Bisphenol A, one of the industrial chemicals used in plastics and in the coating of dishes and medical equipment, behaves as an endocrine disruptor in the human body.
The majority of viral meningitis cases is known to be due to ECHO virus infections on one hand, and mumps on the other. While the latter can be diagnosed by IgM antibody detection from one serum sample in the acute stage, diagnosis of enterovirus infections is by virus isolation and typing. An IgM-antibody test for ECHO 9 and 11 viruses is presented to evaluate the possibility of rapid serological diagnosis of ECHO virus meningitis cases. 36 cases from five local outbreaks due to ECHO 6, 9, 11, and 30 viruses were characterized by virus isolation and serum neutralization tests. All sera (88 samples) were assayed by a MACRIA (M-antibody capturing radioimmunoassay) to ECHO 9 and 11 viruses. While sera from all ECHO 9 and 11 cases, when taken at appropriate times, had IgM antibodies to the infecting type, a varying degree of cross-reactivity could be observed. Specificity problems are discussed in comparison with isolated cases of enteroviral infections due to different types, including Coxsackie B viruses.
Which are the types of viral meningitis?
The majority of viral meningitis cases is known to be due to ECHO virus infections on one hand, and mumps on the other.
Hirschsprung disease, or congenital aganglionic megacolon, is commonly assumed to be a sex-modified multifactorial trait. To test this hypothesis, complex segregation analysis was performed on data on 487 probands and their families. Demographic information on probands and the recurrence risk to relatives of probands are presented. An increased sex ratio (3.9 male:female) and an elevated risk to sibs (4%), as compared with the population incidence (0.02%), are observed, with the sex ratio decreasing and the recurrence risk to sibs increasing as the aganglionosis becomes more extensive. Down syndrome was found at an increased frequency among affected individuals but not among their unaffected sibs, and the increase was not associated with maternal age. Complex segregation analysis was performed on these family data. The families were classified into separate categories by extent of aganglionosis. For cases with aganglionosis beyond the sigmoid colon, the mode of inheritance is compatible with a dominant gene with incomplete penetrance, while for cases with aganglionosis extending no farther than the sigmoid colon, the inheritance pattern is equally likely to be either multifactorial or due to a recessive gene with very low penetrance. A model of gene action with random effects during morphogenesis is compatible with our observations.
Is aganglionic megacolon a feature of Down syndrome?
Hirschsprung disease, or congenital aganglionic megacolon, is commonly assumed to be a sex-modified multifactorial trait. To test this hypothesis, complex segregation analysis was performed on data on 487 probands and their families. Demographic information on probands and the recurrence risk to relatives of probands are presented. An increased sex ratio (3.9 male:female) and an elevated risk to sibs (4%), as compared with the population incidence (0.02%), are observed, with the sex ratio decreasing and the recurrence risk to sibs increasing as the aganglionosis becomes more extensive. Down syndrome was found at an increased frequency among affected individuals but not among their unaffected sibs, and the increase was not associated with maternal age
Cidec is a lipid droplet-associated protein, which inhibits lipolysis, leading to the accumulation of triglycerides in adipocytes. However, the transcriptional regulation of Cidec in adipocyte remains unknown. In the present study we investigated that the mouse Cidec transcript is regulated by PPARgamma2. After the differentiation of adipocyte, the expression pattern of Cidec was similar to that of PPARgamma2. In the presence of a PPARgamma agonist, the level of Cidec mRNA was highly increased. In addition, putative PPRE sites were identified in the Cidec promoter. By chromatin immunoprecipitation assay and reporter assay, we observed the binding of PPARgamma2 to the promoter of Cidec. Gel shift assay and the mutagenesis study were showed that the -219/-207 region of the Cidec promoter could function as a PPRE of the Cidec promoter. These results suggest that PPARgamma2 is required for the transcriptional activity of Cidec during adipogenesis, which could be contributed to understand the molecular mechanism of lipid droplet formation in adipocytes.
Which cells express CIDEC protein in humans?
After the differentiation of adipocyte, the expression pattern of Cidec was similar to that of PPARgamma2.
Lantibiotics are peptide antibiotics, realizing their unique secondary structure by posttranslational modifications, the most important one being the formation of the characteristic amino acid lanthionine. Like other ribosomal peptide antibiotics, they are synthesized with an N-terminal leader peptide important for posttranslational processing by modifying enzymes; after peptide maturation, the leader peptide is proteolytically cleaved off. Numerous studies of the leader peptides of class I and II lantibiotics already showed their crucial role in recognition, self-immunity, and extracellular transport. The recently described labyrinthopeptins, members of the family of class III lantibiotics, exhibit the characteristic novel amino acid labionin, which was revealed by elucidation of the structure of labyrinthopeptin A2. The assembly of the labionin motif in the linear peptide chain is mediated by the lyase-kinase-cyclase-type enzyme LabKC through a serine side chain phosphorylation with GTP, elimination of the phosphate group, and a subsequent 2-fold Michael-type addition cyclization. In this work, we systematically investigated for the first time the importance of the leader peptide in the processing of class III lantibiotics using the example of the labyrinthopeptin A2 precursor peptide. In vitro studies with synthetic leader peptide analogues revealed that a conserved N-terminal hydrophobic patch on a putative helical structure is required for the proper peptide processing by the modifying enzyme LabKC. On the other hand, studies showed that the C-terminal part of the leader peptide serves as a spacer between the binding site and active sites for phosphorylation and elimination, thus restricting the number of hydroxy amino acid side chains that could undergo dehydration. Finally, a model for the peptide recognition and processing by the LabKC has been postulated.
What distinguishes lantibiotics from antibiotics?
Lantibiotics are peptide antibiotics, realizing their unique secondary structure by posttranslational modifications, the most important one being the formation of the characteristic amino acid lanthionine.
AAV9 vector provides efficient gene transfer in all segments of the renal nephron, with minimum expression in non-renal cells, when administered retrogradely via the ureter. It is important to restrict the transgene expression to the desired cell type within the kidney, so that the physiological endpoints represent the function of the transgene expressed in that specific cell type within kidney. We hypothesized that segment-specific gene expression within the kidney can be accomplished using the highly efficient AAV9 vectors carrying the promoters of genes that are expressed exclusively in the desired segment of the nephron in combination with administration by retrograde infusion into the kidney via the ureter. We constructed AAV vectors carrying eGFP under the control of: kidney-specific cadherin (KSPC) gene promoter for expression in the entire nephron; Na/glucose co-transporter (SGLT2) gene promoter for expression in the S1 and S2 segments of the proximal tubule; sodium, potassium, 2 chloride co-transporter (NKCC2) gene promoter for expression in the thick ascending limb of Henle's loop (TALH); E-cadherin (ECAD) gene promoter for expression in the collecting duct (CD); and cytomegalovirus (CMV) early promoter that provides expression in most of the mammalian cells, as control. We tested the specificity of the promoter constructs in vitro for cell type-specific expression in mouse kidney cells in primary culture, followed by retrograde infusion of the AAV vectors via the ureter in the mouse. Our data show that AAV9 vector, in combination with the segment-specific promoters administered by retrograde infusion via the ureter, provides renal nephron segment-specific gene expression.
What is the function of the protein encoded by the gene NKCC2?
2 chloride co-transporter (NKCC2) gene
INSURE method can improve the oxygenation function of the lung, decrease the incidence of VAP and shorten the duration of oxygen therapy in neonates with NRDS, which is probably due to the fact that this method can reduce the production of TNF-α and SF and inhibit the decrease of IL-10.
What is the INSURE procedure in premature babies.
INSURE method can improve the oxygenation function of the lung, decrease the incidence of VAP and shorten the duration of oxygen therapy in neonates with NRDS
Lacosamide (LCM), (SPM 927, (R)-2-acetamido-N-benzyl-3-methoxypropionamide, previously referred to as harkoseride or ADD 234037) is a member of a series of functionalized amino acids that were specifically synthesized as anticonvulsive drug candidates. LCM has demonstrated antiepileptic effectiveness in different rodent seizure models and antinociceptive potential in experimental animal models that reflect distinct types and symptoms of neuropathic as well as chronic inflammatory pain. Recent results suggest that LCM has a dual mode of action underlying its anticonvulsant and analgesic activity. It was found that LCM selectively enhances slow inactivation of voltage-gated sodium channels without affecting fast inactivation. Furthermore, employing proteomic affinity-labeling techniques, collapsin-response mediator protein 2 (CRMP-2 alias DRP-2) was identified as a binding partner. Follow-up experiments confirmed a functional interaction of LCM with CRMP-2 in vitro. LCM did not inhibit or induce a wide variety of cytochrome P450 enzymes at therapeutic concentrations. In safety pharmacology and toxicology studies conducted in mice, rats, rabbits, and dogs, LCM was well tolerated. Either none or only minor side effects were observed in safety studies involving the central nervous, respiratory, gastrointestinal, and renal systems and there is no indication of abuse liability. Repeated dose toxicity studies demonstrated that after either intravenous or oral administration of LCM the adverse events were reversible and consisted mostly of exaggerated pharmacodynamic effects on the CNS. No genotoxic or carcinogenic effects were observed in vivo, and LCM showed a favorable profile in reproductive and developmental animal studies. Currently, LCM is in a late stage of clinical development as an adjunctive treatment for patients with uncontrolled partial-onset seizures, and it is being assessed as monotherapy in patients with painful diabetic neuropathy. Further trials to identify LCM's potential in pain and for other indications have been initiated.
What are the main indications of lacosamide?
Currently, LCM is in a late stage of clinical development as an adjunctive treatment for patients with uncontrolled partial-onset seizures, and it is being assessed as monotherapy in patients with painful diabetic neuropathy.
Tumours defined as Ewing sarcoma (ES) constitute a group of highly malignant neoplasms that most often affect children and young adults in the first 2 decades of life. The EWS/Fli-1 fusion gene, a product of the translocation t(11;22) (q24; 12), is detected in 95% of ES patients. Recently, it was validated that cells emit a heterogeneous mixture of vesicular, organelle-like structures (microvesicles, MVs) into their surroundings including blood and body fluids, and that these MVs contain a selected set of tumor-related proteins and high levels of mRNAs and miRNAs. In this present study, we detected the Ewing sarcoma-specific EWS/Fli-1 mRNA in MVs from the culture medium of ES cell lines carrying t(11;22) (q24; 12). Also, we detected this fusion gene in approximately 40% of the blood samples from mice inoculated with xenografts of TC135 or A673 cells. These findings indicate the EWS/Fli-1 mRNA in MVs might be a new non-invasive diagnostic marker for specific cases of Ewing sarcoma.
Which translocation is the hallmark of Ewing sarcoma?
Tumours defined as Ewing sarcoma (ES) constitute a group of highly malignant neoplasms that most often affect children and young adults in the first 2 decades of life. The EWS/Fli-1 fusion gene, a product of the translocation t(11;22) (q24; 12), is detected in 95% of ES patients
A major goal of current human genome-wide studies is to identify the genetic basis of complex disorders. However, the availability of an unbiased, reliable, cost efficient and comprehensive methodology to analyze the entire genome for complex disease association is still largely lacking or problematic. Therefore, we have developed a practical and efficient strategy for whole genome association studies of complex diseases by charting the human genome at 100 kb intervals using a collection of 27,039 microsatellites and the DNA pooling method in three successive genomic screens of independent case-control populations. The final step in our methodology consists of fine mapping of the candidate susceptible DNA regions by single nucleotide polymorphisms (SNPs) analysis. This approach was validated upon application to rheumatoid arthritis, a destructive joint disease affecting up to 1% of the population. A total of 47 candidate regions were identified. The top seven loci, withstanding the most stringent statistical tests, were dissected down to individual genes and/or SNPs on four chromosomes, including the previously known 6p21.3-encoded Major Histocompatibility Complex gene, HLA-DRB1. Hence, microsatellite-based genome-wide association analysis complemented by end stage SNP typing provides a new tool for genetic dissection of multifactorial pathologies including common diseases.
How many genes outside of the MHC locus have been genetically associated to Rheumatoid Arthritis through GWAS?
A total of 47 candidate regions were identified.
Several related isoforms of p38MAPK have been identified and cloned in many species. Although they all contain the dual phosphorylation motif TGY, the expression of these isoforms is not ubiquitous. p38alpha and -beta2 are ubiquitously expressed, whereas p38gamma and -delta appear to have more restricted expression. Because there is evidence for selective activation by upstream kinases and selective preference for downstream substrates, the functions of these conserved proteins is still incompletely understood. We have demonstrated that the renal mesangial cell expresses the mRNA for all the isoforms of p38MAPK, with p38alpha mRNA expressed at the highest level, followed by p38gamma and the lowest levels of expression by p38beta2 and -delta. To determine the functional effects of these proteins on interleukin (IL)-1beta-induced inducible nitric oxide synthase (iNOS) expression, we transduced TAT-p38 chimeric proteins into renal mesangial cells and assessed the effects of wild-type and mutant p38 isoforms on ligand induced iNOS expression. We show that whereas p38gamma and -delta had minimal effects on iNOS expression, p38alpha and -beta2 significantly altered its expression. p38alpha mutant and p38beta2 wild-type dose dependently inhibited IL-1beta-induced iNOS expression. These data suggest that p38alpha and beta2 have reciprocal effects on iNOS expression in the mesangial cell, and these observations may have important consequences for the development of selective inhibitors targeting the p38MAPK family of proteins.
Which proteins are the different isoforms of the p38 MAP kinase?
p38alpha and -beta2 are ubiquitously expressed, whereas p38gamma and -delta appear to have more restricted expression.
Modifiers of position-effect-variegation in Drosophila are thought to encode proteins that are either structural components of heterochromatin or enzymes that modify these components. We have recently shown that a sequence motif found in one Drosophila modifier gene, Heterochromatin protein 1 (HP1), is conserved in a wide variety of animal and plant species (Singh et al. 1991). Using this motif, termed chromo box, we have cloned a mouse candidate modifier gene, M31, that also shows considerable sequence homology to Drosophila HP1. Here we report evidence of at least four independently segregating loci in the mouse homologous to the M31 cDNA. One of these loci--Cbx-rs1--maps to the X Chromosome (Chr), 1 cM proximal to Amg and outside the X-inactivation center region.
How is CBX1/M31 related to position-effect variegation?
Here we report evidence of at least four independently segregating loci in the mouse homologous to the M31 cDNA. One of these loci--Cbx-rs1--maps to the X Chromosome (Chr), 1 cM proximal to Amg and outside the X-inactivation center region
Calciphylaxis is a rare condition characterized by medial calcification of small- and medium-sized vessels that subsequently leads to ischemic necrosis. Calciphylaxis most often occurs in patients with end-stage renal disease and secondary hyperparathyroidism. We present a unique case of calciphylaxis in which the patient did not have end-stage renal disease. Instead, primary hyperparathyroidism and/or alcoholic cirrhosis were the more likely causes of her calciphylaxis. In addition, our case demonstrated not only calciphylaxis but also fragmentation and calcification of elastic fibers within the dermis, changes that are most often seen in pseudoxanthoma elasticum. This is the first reported case of calciphylaxis, to our knowledge, with histopathologic changes of pseudoxanthoma elasticum in a patient who is nonuremic.
What is calciphylaxis
Calciphylaxis is a rare condition characterized by medial calcification of small- and medium-sized vessels that subsequently leads to ischemic necrosis.
The novel antiarrhythmic drug K201 (4-[3-{1-(4-benzyl)piperidinyl}propionyl]-7-methoxy-2,3,4,5-tetrahydro-1,4-benzothiazepine monohydrochloride) is currently in development for treatment of atrial fibrillation. K201 not only controls intracellular calcium release by the ryanodine receptors, but also possesses a ventricular action that might predispose to torsade de pointes arrhythmias. The anti- and proarrhythmic effects of K201 were investigated in the anesthetized canine chronic atrioventricular block model. Two doses of K201 (0.1 and 0.3mg/kg/2 min followed by 0.01 and 0.03 mg/kg/30 min i.v.) were tested in 4 serial experiments in dogs with normally conducted sinus rhythm (n=10) and in torsade de pointes-susceptible dogs with chronic atrioventricular block. Susceptibility was assessed with dofetilide (0.025 mg/kg/5 min i.v.). Beat-to-beat variability of repolarization was quantified as short-term variability of left ventricular monophasic action potential duration. In dogs with normally conducted sinus rhythm, both doses of K201 prolonged ventricular repolarization whereas only the higher dose prolonged atrial repolarization. At chronic atrioventricular block, dofetilide induced torsade de pointes in 9 of 10 dogs. K201 did neither suppress nor prevent dofetilide-induced torsade de pointes. K201 dose-dependently prolonged ventricular repolarization. In contrary to the lower dose, the higher dose did increase beat-to-beat variability of repolarization (from 1.2 ± 0.3 to 2.9 ± 0.8 ms, P<0.05) and resulted in spontaneous, repetitive torsade de pointes arrhythmias in 1 of 7 dogs; Programmed electrical stimulation resulted in torsade de pointes in 2 more dogs. In conclusion, both doses of K201 showed a class III effect. No relevant antiarrhythmic effects against dofetilide-induced torsade de pointes were seen. Only at the higher dose a proarrhythmic signal was observed.
Is JTV519 (K201) a potential drug for the prevention of arrhythmias?
The novel antiarrhythmic drug K201 (4-[3-{1-(4-benzyl)piperidinyl}propionyl]-7-methoxy-2,3,4,5-tetrahydro-1,4-benzothiazepine monohydrochloride) is currently in development for treatment of atrial fibrillation. K201 not only controls intracellular calcium release by the ryanodine receptors, but also possesses a ventricular action that might predispose to torsade de pointes arrhythmias.
The CM1 score portrayed 30 novel biomarkers for predicting breast cancer subtypes, with the confirmation of the role of 12 well-established genes. Intrinsic subtypes assigned using the CM1 list and the ensemble of classifiers are more consistent and homogeneous than the original PAM50 labels. The new subtypes show accurate distributions of current clinical markers ER, PR and HER2, and survival curves in the METABRIC and ROCK data sets. Remarkably, the paradoxical attribution of the original labels reinforces the limitations of employing a single sample classifiers to predict breast cancer intrinsic subtypes.
What is the aim of the METABRIC project?
The new subtypes show accurate distributions of current clinical markers ER, PR and HER2, and survival curves in the METABRIC and ROCK data sets.
The GeneWeaver data and analytics website (www.geneweaver.org) is a publically available resource for storing, curating and analyzing sets of genes from heterogeneous data sources. The system enables discovery of relationships among genes, variants, traits, drugs, environments, anatomical structures and diseases implicitly found through gene set intersections. Since the previous review in the 2012 Nucleic Acids Research Database issue, GeneWeaver's underlying analytics platform has been enhanced, its number and variety of publically available gene set data sources has been increased, and its advanced search mechanisms have been expanded. In addition, its interface has been redesigned to take advantage of flexible web services, programmatic data access, and a refined data model for handling gene network data in addition to its original emphasis on gene set data. By enumerating the common and distinct biological molecules associated with all subsets of curated or user submitted groups of gene sets and gene networks, GeneWeaver empowers users with the ability to construct data driven descriptions of shared and unique biological processes, diseases and traits within and across species.
What is GeneWeaver used for?
The GeneWeaver data and analytics website (www.geneweaver.org) is a publically available resource for storing, curating and analyzing sets of genes from heterogeneous data sources.
Muenke syndrome is an autosomal dominant disorder characterized by coronal suture craniosynostosis, hearing loss, developmental delay, carpal and tarsal fusions, and the presence of the Pro250Arg mutation in the FGFR3 gene. Reduced penetrance and variable expressivity contribute to the wide spectrum of clinical findings in Muenke syndrome. To better define the clinical features of this syndrome, we initiated a study of the natural history of Muenke syndrome. To date, we have conducted a standardized evaluation of nine patients with a confirmed Pro250Arg mutation in FGFR3. We reviewed audiograms from an additional 13 patients with Muenke syndrome. A majority of the patients (95%) demonstrated a mild-to-moderate, low frequency sensorineural hearing loss. This pattern of hearing loss was not previously recognized as characteristic of Muenke syndrome. We also report on feeding and swallowing difficulties in children with Muenke syndrome. Combining 312 reported cases of Muenke syndrome with data from the nine NIH patients, we found that females with the Pro250Arg mutation were significantly more likely to be reported with craniosynostosis than males (P < 0.01). Based on our findings, we propose that the clinical management should include audiometric and developmental assessment in addition to standard clinical care and appropriate genetic counseling.
Is there an association between Muenke Syndrome and FGFR3 gene mutation?
Muenke syndrome is an autosomal dominant disorder characterized by coronal suture craniosynostosis, hearing loss, developmental delay, carpal and tarsal fusions, and the presence of the Pro250Arg mutation in the FGFR3 gene.
The deficiency of steroid 5 alpha-reductase leads to the disturbances in sex differentiation that cause symptoms of male pseudohermaphroditism. The methods of DNA analysis used to diagnose mutations of steroid 5 alpha-reductase gene (SRD5A2) were presented and discussed. Within the group of 21 patients with the deficiency of steroid 5 alpha-reductase 2 described so far in literature, the analysis of SRD5A2 gene revealed two "major" deletions, one "minor" deletion, 16 point mutations (incl. 5 transitions and 11 transversions), in one case a mutation causing premature termination of translation and in one case mutation leading to defective splicing of the mRNA. The mutations localized in exons 2 and 5 cause a decrease in affinity of 5 alpha-reductase 2 to the substrate (testosterone), while the mutations in exons 1 and 4, a decrease in affinity to the coenzyme (NADPH).
Does steroid 5A-Reductase deficiency lead to hermaphroditism?
The deficiency of steroid 5 alpha-reductase leads to the disturbances in sex differentiation that cause symptoms of male pseudohermaphroditism.
Anemia is as a frequent complication in patients with chronic kidney disease, which gains in importance in the treatment of patients with renal disease. The main cause of renal anemia is the inadequately low production of endogenous erythropoietin. Often the patients develop an additional absolute or functional iron deficiency, which complicates the diagnostic and therapeutic procedures. Substitution of recombinant human erythropoietin (r-HuEPO) is the most effective therapy. The goal is a stable haemoglobin level >11 g/dl. An often additional existing iron deficiency should be balanced adequately according to the guidelines. With consequent and early treatment morbidity, mortality, and quality of life can be effectively improved.
Is Iron deficiency anemia a common complication of chronic kidney disease?
Anemia is as a frequent complication in patients with chronic kidney disease, which gains in importance in the treatment of patients with renal diseas
Plasmodium falciparum, the causative agent of the most deadly form of human malaria, is unable to salvage pyrimidines and must rely on de novo biosynthesis for survival. Dihydroorotate dehydrogenase (DHODH) catalyzes the rate-limiting step in the pyrimidine biosynthetic pathway and represents a potential target for anti-malarial therapy. A high throughput screen and subsequent medicinal chemistry program identified a series of N-alkyl-5-(1H-benzimidazol-1-yl)thiophene-2-carboxamides with low nanomolar in vitro potency against DHODH from P. falciparum, P. vivax, and P. berghei. The compounds were selective for the parasite enzymes over human DHODH, and x-ray structural data on the analog Genz-667348, demonstrated that species selectivity could be attributed to amino acid differences in the inhibitor-binding site. Compounds from this series demonstrated in vitro potency against the 3D7 and Dd2 strains of P. falciparum, good tolerability and oral exposure in the mouse, and ED(50) values in the 4-day murine P. berghei efficacy model of 13-21 mg/kg/day with oral twice-daily dosing. In particular, treatment with Genz-667348 at 100 mg/kg/day resulted in sterile cure. Two recent analogs of Genz-667348 are currently undergoing pilot toxicity testing to determine suitability as clinical development candidates.
Human dihydroorotate dehydrogenase is a drug target and is involved in what biosynthetic pathway
Dihydroorotate dehydrogenase (DHODH) catalyzes the rate-limiting step in the pyrimidine biosynthetic pathway and represents a potential target for anti-malarial therapy.
Eukaryotic cells contain multiple versions of the E3 ubiquitin ligase known as the SCF (Skp1/cullin/F box), each of which is distinguished by a different F box protein that uses a domain at the carboxyl terminus to recognize substrates [1, 2]. The F box protein Dia2 is an important determinant of genome stability in budding yeast [3-5], but its mode of action is poorly understood. Here we show that SCF(Dia2) associates with the replisome progression complex (RPC) that assembles around the MCM2-7 helicase at DNA replication forks [6]. This interaction requires the RPC components Mrc1 and Ctf4, both of which associate with a tetratricopeptide repeat (TPR) domain located at the amino terminus of Dia2. Our data indicate that the TPR domain of Dia2 tethers SCF(Dia2) to the RPC, probably increasing the local concentration of the ligase at DNA replication forks. This regulation becomes important in cells that accumulate stalled DNA replication forks at protein-DNA barriers, perhaps aiding the interaction of SCF(Dia2) with key substrates. Our findings suggest that the amino-terminal domains of other F box proteins might also play an analogous regulatory role, controlling the localization of the cognate SCF complexes.
List the components of a Replisome Progression Complex (RPC).
Here we show that SCF(Dia2) associates with the replisome progression complex (RPC) that assembles around the MCM2-7 helicase at DNA replication forks [6].
Piebaldism is a rare disorder present at birth and inherited as an autosomal dominant trait. It results from a mutation in the c-kit proto-oncogene and is associated with a defect in the migration and differentiation of melanoblasts from the neural crest. Clinical manifestations and phenotypic severity strongly correlates with the site of mutation within the KIT gene. Here we report a 3-year-old boy and his 33-year-old father with leukoderma and poliosis associated with clinical criteria for Neurofibromatosis type 1. Genetic study of both revealed a p.Gly610Asp mutation in the KIT gene. This familiar mutation has not yet been reported in the literature. There are rare reports of piebaldism in association with neurofibromatosis type I.
What is Piebaldism?
Piebaldism is a rare disorder present at birth and inherited as an autosomal dominant trait. It results from a mutation in the c-kit proto-oncogene and is associated with a defect in the migration and differentiation of melanoblasts from the neural crest.
Losses of chromosomes 1p and 19q are deemed correlated with diagnosis of oligodendroglioma, higher chemosensitivity and better prognosis. We reviewed the literature to evaluate the usefulness of these correlations in daily clinical practice. The rates of deletions relative to histology (WHO classifications) were extracted from 33 studies, including 2666 patients. The 1p deletions and 1p19q codeletion mean rates were respectively 65.4 and 63.3% in oligodendrogliomas, 28.7 and 21.6% in oligoastrocytomas, 13.2 and 7.5% in astrocytomas, 11.6 and 2.9% in glioblastomas. The presence of 1p deletion and 1p19q codeletion were strongly correlated with the histological diagnosis corresponding to oligodendroglioma. Calculation of specificity, sensitivity, predictive positive values and false negative rates suggests that presence of deletion 1p or codeletion represents a strong argument in favor of the diagnosis of oligodendroglioma. However, considering the high false negative rate, absence of such deletions does not rule out the diagnosis. In grade 3 oligodendroglial tumors, the probability of responding to chemotherapy, and the duration of response, were higher when codeletions were present. This suggests that, in these tumors, the presence of codeletion is a strong argument in favor of adjuvant chemotherapy. However, chemotherapy should not be systematically excluded when codeletions are absent, as the chances of response are about 33% in this situation. Data concerning low-grade gliomas were more controversial. Oligodendroglial tumors with 1p deletion or 1p19q codeletion seemed to have a better prognosis, as five-year survival rates were 50% higher than in tumors without deletion. This might be explained by the correlation between 1p deletion and other identified prognosis factors: (1) higher chemosensitivity, (2) tumor location more frequently in the frontal lobe, leading to better resection and lower risk of neurological deficit, (3) slower growth rate, (4) higher risk of epilepsy, leading to an early detection.
The 1p19q co-deletion is associated with what types of tumors?
uation. Data concerning low-grade gliomas were more controversial. Oligodendroglial tumors with 1p deletion or 1p19q codeletion seemed to have a bette
Neurofibromatosis type 1 (NF1) is one of the most common human genetic disorders and is associated with significant morbidity and mortality. The gene responsible for this disorder, NF1, encodes neurofibromin, which can function to down-regulate ras activity. Mutations that inactivate NF7 result in elevated levels of ras signaling and increased cell proliferation in some tissues. NF7 functions as a tumor suppressor gene; patients inherit one mutated copy and are believed to acquire a "second hit" in tissues that go on to form benign or malignant tumors. NF7 is expressed widely, yet certain tissues are more susceptible to growth dysregulation in NF1 patients. Cardiovascular defects also contribute to NF1, though the cause remains unclear. In a recent study, we used tissue-specific gene inactivation in mice to study the role of neurofibromin in heart development. A further understanding of neurofibromin function will help to elucidate the pathophysiology of NF1 and will also lead to a better understanding of cell cycle regulation and ras pathways in specific cell types. Finally, we comment on how similar genetic strategies can be used in mice to study the role of additional signaling pathways involved in heart development.
Which is the gene mutated in type 1 neurofibromatosis?
type 1 (NF1) is one of the most common human genetic disorders and is associated with significant morbidity and mortality. The gene responsible for this disorder, NF1, encodes neurofibromin,
CYLD is a deubiquitination enzyme that regulates different cellular processes, such as cell proliferation and cell survival. Mutation and loss of heterozygosity of the CYLD gene causes development of cylindromatosis, a benign tumour originating from the skin. Our study shows that CYLD expression is dramatically downregulated in basal cell carcinoma (BCC), the most common cancer in humans. Reduced CYLD expression in basal cell carcinoma was mediated by GLI1-dependent activation of the transcriptional repressor Snail. Inhibition of GLI1 restored the CYLD expression-mediated Snail signaling pathway, and caused a significant delay in the G1 to S phase transition, as well as proliferation. Our data suggest that GLI1-mediated suppression of CYLD has a significant role in basal cell carcinoma progression.
Which pathological conditions are caused by mutations in the CYLD gene?
Mutation and loss of heterozygosity of the CYLD gene causes development of cylindromatosis, a benign tumour originating from the skin
Karyopherins mediate the macromolecular transport between the cytoplasm and the nucleus and participate in cancer progression. However, the role and mechanism of importin-11 (IPO11), a member of the karyopherin family, in glioma progression remain undefined. Effects of IPO11 on glioma progression were detected using CCK-8, colony formation assay, flow cytometry analysis, caspase-3 activity assay, and Transwell invasion assay. Western blot analysis was used to detect the expression of active caspase-3, active caspase-7, active caspase-9, N-cadherin, Vimentin, E-cadherin, β-catenin, and c-Myc. The activity of Wnt/β-catenin pathway was evaluated by the T-cell factor/lymphoid enhancer factor (TCF/LEF) transcription factor reporter assay. Results showed that IPO11 knockdown inhibited proliferation and reduced colony number in glioma cells. IPO11 silencing promoted the apoptotic rate, increased expression levels of active caspase-3, caspase-7, and caspase-9, and enhanced caspase-3 activity. Moreover, IPO11 silencing inhibited glioma cell invasion by suppressing epithelial-to-mesenchymal transition (EMT). Mechanistically, IPO11 knockdown inactivated the Wnt/β-catenin pathway. β-Catenin overexpression abolished the effects of IPO11 silencing on the proliferation, apoptosis, and invasion in glioma cells. Furthermore, IPO11 silencing blocked the malignant phenotypes and repressed the Wnt/β-catenin pathway in vivo. In conclusion, IPO11 knockdown suppressed the malignant phenotypes of glioma cells by inactivating the Wnt/β-catenin pathway.
Proteins in the karyopherin family (Kaps) are associated with what cellular process?
Karyopherins mediate the macromolecular transport between the cytoplasm and the nucleus and participate in cancer progression.
The Sprague Dawley (SD) and Han Wistar (HW) are the two most commonly used rat strains in Europe and the US, with the Han Wistar increasing in popularity because of its greater longevity and lower tumor burden. This survey was undertaken at Covance CRS (Huntingdon and Eye) to compare in-house longevity and common spontaneous tumor profiles of the two strains with published data. Data were compiled from 104-week studies started between 2010 and 2017. Mean survival was greater for both sexes of HWs when compared with SDs. Pituitary tumors were the commonest in both strains, with slightly higher incidences and more malignant tumors in SDs of both sexes. Mammary tumors were the second most common tumor in both strains; the incidence being greater in SDs compared to HWs. Benign pheochromocytomas of the adrenal and fibromas of the skin/subcutis were commoner in male SDs than in HWs. Granular cell tumors of the uterine tract were recorded only in SDs, but uterine stromal and glandular tumors were more common in HWs, which also displayed a higher incidence of granulosa cell tumors of the ovaries. Vascular tumors of the mesenteric lymph nodes, thymomas and follicular cell tumors of the thyroids were recorded at a higher incidence in HWs than in SDs. Tumor profiles of other common tumors were broadly similar between the two strains. The results of this survey correlate closely with similar comparisons made at other laboratories, and with data compiled at our laboratories 10 years ago and published as a poster.
Han Wistar and Sprague Dawley are breeds of what laboratory animal?
The Sprague Dawley (SD) and Han Wistar (HW) are the two most commonly used rat strains in Europe and the US, with the Han Wistar increasing in popularity because of its greater longevity and lower tumor burden.
The varied spectrum of presentation of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is intriguing. Multisystem inflammatory syndrome in children (MIS-C) is a well described and documented condition that is associated with the active or recent COVID-19 infection. A similar presentation in adults is termed as Multisystem inflammatory syndrome in Adults (MIS-A). With only very limited cases reported from the west, MIS-A is considered a rare and serious complication of COVID-19. However, it is not as uncommon as we think. Many cases go undiagnosed for lack of COVID -19 like symptoms and unawareness among treating clinicians about this newer clinical entity. Further, antibody testing and inflammatory markers are not easily available in many of the Indian hospitals especially in rural India where the second wave had been intense, thereby making it difficult for the diagnosis of MIS-A. Also, there is no clear treatment guideline for MIS-A unlike MIS-C where the treatment protocol is well laid out. Awareness about MIS-A among treating clinicians can thus help in further evaluation and increased identification of the syndrome at the early stages thereby helping in the early institution of treatment. Our tertiary COVID care hospital in South India which has handled about 5200 cases of COVID-19 is been able to identify 04 cases of MIS-A proving that this clinical entity is not as rare as it is thought but lacks reporting and prompt identification. Here we describe 04 cases of MIS-A and strive to bring in the various aspects of it, including the clinical presentation, laboratory markers, diagnostic criteria and treatment considerations in this post second wave of the COVID-19 pandemic in India.
What is the multisystem inflammatory syndrome in children (MIS-C) associated with COVID-19?
Multisystem inflammatory syndrome in children (MIS-C) is a well described and documented condition that is associated with the active or recent COVID-19 infection. A similar presentation in adults is termed as Multisystem inflammatory syndrome in Adults (MIS-A).
We have determined sequences of PCR-amplified B1 elements from hamster and rat (Myomorpha), chipmunk (Sciuromorpha), and guinea pig (Caviomorpha). Between three and six B1 subfamilies were found in these species. In the phylogenetic analysis B1 sequences of hamster, mouse, and rat clustered separately from those of chipmunk and those of guinea pig. This is consistent with an independent evolution of B1 elements in separate rodent lineages. We exclude the possibility of convergent mutations to explain certain diagnostic characters within the modern B1 quasi-dimers and view these elements as mosaic structures assembling preexisting mutations. Furthermore, the presence of Alu-like structural motifs supports the hypothesis of the monophyletic origin of Alu and B1 repeats, i.e., from a common 7SL RNA-derived retroposing monomeric element.
Which is the main difference between Alu and B1 repeats?
Furthermore, the presence of Alu-like structural motifs supports the hypothesis of the monophyletic origin of Alu and B1 repeats, i.e., from a common 7SL RNA-derived retroposing monomeric element.
Mutations in glucocerebrosidase (GCase), the enzyme deficient in Gaucher disease, are a common genetic risk factor for the development of Parkinson disease and related disorders, implicating the role of this lysosomal hydrolase in the disease etiology. A specific physical interaction exists between the Parkinson disease-related protein α-synuclein (α-syn) and GCase both in solution and on the lipid membrane, resulting in efficient enzyme inhibition. Here, neutron reflectometry was employed as a first direct structural characterization of GCase and α-syn·GCase complex on a sparsely-tethered lipid bilayer, revealing the orientation of the membrane-bound GCase. GCase binds to and partially inserts into the bilayer with its active site most likely lying just above the membrane-water interface. The interaction was further characterized by intrinsic Trp fluorescence, circular dichroism, and surface plasmon resonance spectroscopy. Both Trp fluorescence and neutron reflectometry results suggest a rearrangement of loops surrounding the catalytic site, where they extend into the hydrocarbon chain region of the outer leaflet. Taking advantage of contrasting neutron scattering length densities, the use of deuterated α-syn versus protiated GCase showed a large change in the membrane-bound structure of α-syn in the complex. We propose a model of α-syn·GCase on the membrane, providing structural insights into inhibition of GCase by α-syn. The interaction displaces GCase away from the membrane, possibly impeding substrate access and perturbing the active site. GCase greatly alters membrane-bound α-syn, moving helical residues away from the bilayer, which could impact the degradation of α-syn in the lysosome where these two proteins interact.
Which enzyme is deficient in Gaucher's disease?
Mutations in glucocerebrosidase (GCase), the enzyme deficient in Gaucher disease, are a common genetic risk factor for the development of Parkinson disease and related disorders, implicating the role of this lysosomal hydrolase in the disease etiology
Expression of the X inactive-specific transcript (Xist) is thought to be essential for the initiation of X chromosome inactivation and dosage compensation during female embryo development. In the present study, we analyzed the patterns of Xist transcription and the onset of X chromosome inactivation in bovine preattachment embryos. Reverse transcription-polymerase chain reaction (RT-PCR) revealed the presence of Xist transcripts in all adult female somatic tissues evaluated. In contrast, among the male tissues examined, Xist expression was detected only in testis. No evidence for Xist transcription was observed after a single round of RT-PCR from pools of in vitro-derived embryos at the 2- to 4-cell stage. Xist transcripts were detected as a faint amplicon at the 8-cell stage initially, and consistently thereafter in all stages examined up to and including the expanded blastocyst stage. Xist transcripts, however, were subsequently detected from the 2-cell stage onward after nested RT-PCR. Preferential [3H]thymidine labeling indicative of late replication of one of the X chromosomes was noted in female embryos of different developmental ages as follows: 2 of 7 (28.5%) early blastocysts, 6 of 13 (46.1%) blastocysts, 8 of 11 (72.1%) expanded blastocysts, and 14 of 17 (77.7%) hatched blastocysts. These results suggest that Xist expression precedes the onset of late replication in the bovine embryo, in a pattern compatible with a possible role of bovine Xist in the initiation of X chromosome inactivation.
Which is the transcript responsible for X-chromosome inactivation?
X inactive-specific transcript (Xist) is thought to be essential for the initiation of X chromosome inactivation and dosage compensation during female embryo development
BACKGROUND The aim of this study was to investigate the association between A, B, O, Rhesus (Rh)-positive and Rh-negative blood groups and breast cancer in a nationwide cohort of 3,944 patients in Turkey. MATERIAL AND METHODS A retrospective study included 3,944 patients diagnosed with breast cancer between 2004 and 2015 and with known blood type. Clinical and demographic patient data included age, sex, body mass index (BMI), menopausal status. The breast tumor type, size, grade, TNM stage, and the presence of lymph node and distant metastases were noted. Histopathology of the breast tumors had included routine detection of human epidermal growth factor receptor 2 (HER2) and estrogen receptor (ER) levels. RESULTS The 3,944 patients with breast cancer were blood group, type A, B, O, and Rh-positive or Rh-negative; the median age was 47.9 years (range, 18.2-89.6 years); 99.5% (3923/3,844) were women, and 0.5% (21/3944) were men. Patients with blood type 0 had a significantly smaller tumor size compared with patients with blood types A or B. There were no significant differences between blood groups and patient age, BMI, menopausal status, tumor histology, ER status, HER2 status, lymph node and distant metastasis. However, there was a significant difference in the prevalence of lobular breast cancer, levels of ER-positive tumor cells, and prevalence of cases with tumor metastases in Rh-positive patients compared with Rh-negative patients. CONCLUSIONS The findings of this retrospective study showed that the type, grade, stage, and hormonal status of breast cancer showed no significant associations with ABO blood grouping.
List the blood group antigens, associated with blood type
The aim of this study was to investigate the association between A, B, O, Rhesus (Rh)-positive and Rh-negative blood groups
In plants, nucleobase biochemistry is highly compartmented relying upon a well-regulated and selective membrane transport system. In Arabidopsis two proteins, AtAzg1 and AtAzg2, show substantial amino acid sequence similarity to the adenine-guanine-hypoxanthine transporter AzgA of Aspergillus nidulans. Analysis of single and double mutant lines harboring T-DNA insertion alleles AtAzg1-1 and AtAzg2-1 reveal a marked resistance to growth in the presence of 8-azaadenine and 8-azaguanine but not to other toxic nucleobase analogues. Conversely, yeast strains expressing AtAzg1 and AtAzg2 gain heightened sensitivity to growth on 8-azaadenine and 8-azaguanine. Radio-labeled purine uptake experiments in yeast and in planta confirm the function of AtAzg1 and AtAzg2 as plant adenine-guanine transporters.
List representatives of the major fungal hypoxanthine-adenine-guanine transporter families.
In Arabidopsis two proteins, AtAzg1 and AtAzg2, show substantial amino acid sequence similarity to the adenine-guanine-hypoxanthine transporter AzgA of Aspergillus nidulans
Hepatocellular carcinoma (HCC) is regarded as a suitable target for antiangiogenic strategies. However, antiangiogenic agents aimed at single targets can be neutralized by upregulation of other proangiogenic factors. Therefore, combined approaches addressing at least two angiogenic targets should be more effective. Employing an appropriate rat hepatoma model, we examined the effects of sFlt-1 (soluble vascular endothelial growth factor [VEGF] receptor 1 as an indirect inhibitor of angiogenesis) and endostatin (a direct inhibitor of angiogenesis) in both single-agent as well as combined approaches under in vitro and in vivo conditions. Similar to human HCC, rat Morris hepatoma (MH) cells secreted high levels of VEGF, but no endogenous sFlt-1. Parental MH or MHES(r) cells, stably expressing rat endostatin, were adenovirally transduced either with AdsFlt-1 (encoding sFlt-1) or control vector Adnull (containing no transgene), followed by subcutaneous inoculation into syngeneic ACI rats. Compared with MH/Adnull cells, expressing no antiangiogenic factors at all, tumor weights were reduced fourfold in the MHES(r)/Adnull group, 19-fold in the MH/AdsFlt-1-group, and 77-fold in the MHES(r)/AdsFlt-1 combination therapy group. Analysis of variance did not show a significant interaction between the effects of the two factors ES(r) and sFlt-1; their effects multiplied. In conclusion, combined expression of sFlt-1 and endostatin effectively suppresses HCC growth under in vivo conditions. Supplementary material for this article can be found on the HEPATOLOGY website (http://interscience.wiley.com/jpages/0270-9139/suppmat/index.html).
Is endostatin a proangiogenic factor?
endostatin (a direct inhibitor of angiogenesis)
Traumatic brain injury (TBI) is often caused by accidents that damage the brain. TBI can induce glutamate excitotoxicity and lead to neuronal and glial cell death. In this study, we investigated the mechanism of cell death during the secondary damage caused by TBI in vivo and in vitro, as well as the protective effect of resveratrol (RV). Here we report that glycogen synthase kinase-3β (GSK-3β) activation and microtubule-associated protein light chain 3 processing were induced in rat brains exposed to TBI. In the in vitro TBI model, apoptotic and autophagic cell death were induced through glutamate-mediated GSK-3β activation in normal CTX TNA2 astrocytes. The GSK-3β inhibitor SB216763 or transfection of GSK-3β small-interfering RNA increases cell survival. By contrast, overexpression of GSK-3β enhanced glutamate excitotoxicity. Administration of RV reduced cell death in CTX TNA2 astrocytes by suppressing reactive oxygen species (ROS)-mediated GSK-3β activation, the mechanism by which RV also exerted protective effects in vivo. Mitochondrial damages, including the opening of mitochondrial permeability transition pore (MPTP) and mitochondrial depolarization, were induced by glutamate through the ROS/GSK-3β pathway. Moreover, cyclosporine A, an MPTP inhibitor, suppressed mitochondrial damage and the percentages of cells undergoing autophagy and apoptosis and thereby increased cell survival. Taken together, our results demonstrated that cell death occurring after TBI is induced through the ROS/GSK-3β/mitochondria signaling pathway and that administration of RV can increase cell survival by suppressing GSK-3β-mediated autophagy and apoptosis. Therefore, the results indicated that resveratrol may serve as a potential therapeutic agent in the treatment of TBI.
List inhibtors targeting the mitochondrial permeability transition pore.
cyclosporine A, an MPTP inhibitor,
Aberrant PRC2 activity produces gene repressive epigenetic marks in multiple diseases and led to identification of Ezh2 as a drug target. Recent studies have shown that the epigenetic reader protein EED, associated with Ezh2 in PRC2, has an additional function to stimulate the PRC2 activity after binding to H3K27me3. Optimizing a compound known to block the H3K27me3 site in EED discovered by in-house screening, Novartis scientists have now produced a compound that shows durable tumor regression in a lymphoma xenograft model.
Which epigenetic mark is deposited by PRC2?
PRC2, has an additional function to stimulate the PRC2 activity after binding to H3K27me3
Over 70% of diffuse intrinsic pediatric gliomas, an aggressive brainstem tumor, harbor heterozygous mutations that create a K27M amino acid substitution (methionine replaces lysine 27) in the tail of histone H3.3. The role of the H3.3K27M mutation in tumorigenesis is not fully understood. Here, we use a human embryonic stem cell system to model this tumor. We show that H3.3K27M expression synergizes with p53 loss and PDGFRA activation in neural progenitor cells derived from human embryonic stem cells, resulting in neoplastic transformation. Genome-wide analyses indicate a resetting of the transformed precursors to a developmentally more primitive stem cell state, with evidence of major modifications of histone marks at several master regulator genes. Drug screening assays identified a compound targeting the protein menin as an inhibitor of tumor cell growth in vitro and in mice.
Which histone mutation is associated with gliomas?
We show that H3.3K27M expression synergizes with p53 loss and PDGFRA activation in neural progenitor cells derived from human embryonic stem cells, resulting in neoplastic transformation.
Oral vanoxerine converted AF/AFL to SR at a high rate, was well tolerated, and caused no ventricular proarrhythmia.
What alternate indication has Vanoxerine been repositioned for?
Oral vanoxerine converted AF/AFL to SR at a high rate, was well tolerated, and caused no ventricular proarrhythmia.