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https://www.readbyqxmd.com/read/28218781/study-on-the-effects-of-blueberry-treatment-on-histone-acetylation-modification-of-ccl4-induced-liver-disease-in-rats
#1
W Zhan, X Liao, T Tian, L Yu, X Liu, B Li, J Liu, B Han, R J Xie, Q H Ji, Q Yang
The objective of this study was to investigate the effects of blueberry treatment on histone acetylation modification of carbon tetrachloride (CCl4)-induced liver disease in rats. Laboratory rats were randomly divided into control, hepatic fibrosis, blueberry treatment, blueberry intervention, and natural recovery groups. Rats in the model groups were treated with CCl4 administered subcutaneously at 4- and 8-week intervals, and then executed. Both the 4- and 8-week treatment groups were treated with blueberry juice for 8 weeks, and then executed after 12 and 16 weeks, respectively...
February 16, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28187447/egr-1-and-rna-pol-ii-facilitate-glioma-cell-gdnf-transcription-induced-by-histone-hyperacetylation-in-promoter-ii
#2
Bao-Le Zhang, Ting-Wen Guo, Le-Le Gao, Guang-Quan Ji, Xiao-He Gu, Yu-Qi Shao, Rui-Qin Yao, Dian-Shuai Gao
The specific mechanisms for epigenetic regulation of gene transcription remain to be elucidated. We previously demonstrated that hyperacetylation of histone H3K9 in promoter II of glioma cells promotes high transcription of the glial cell line-derived neurotrophic factor (GDNF) gene. This hyperacetylation significantly enhanced Egr-1 binding and increased the recruitment of RNA polymerase II (RNA POL II) to that region (P < 0.05). Egr-1 expression was abnormally increased in C6 glioma cells. Further overexpression of Egr-1 significantly increased Egr-1 binding to GDNF promoter II, while increasing RNA POL II recruitment, thus increasing GDNF transcription (P < 0...
February 6, 2017: Oncotarget
https://www.readbyqxmd.com/read/28178526/crl4-dcaf8-ubiquitin-ligase-targets-histone-h3k79-and-promotes-h3k9-methylation-in-the-liver
#3
Gaofeng Li, Tong Ji, Jiang Chen, Yufei Fu, Lidan Hou, Yan Feng, Tingyue Zhang, Tianyu Song, Jie Zhao, Yoko Endo, Hui Lin, Xiujun Cai, Yong Cang
Transcription from chromosomes is regulated by posttranslational modifications to histones, such as methylation and ubiquitination. Monoubiquitination of histones H2A and H2B influences H3 methylation to reinforce the activation or repression of gene expression. Here, we provide evidence that H3 polyubiquitination represses transcription of fetal and cell-cycle genes in postnatal mouse liver by crosstalk with H3K9 methylation. We found that the CRL4 ubiquitin ligase targets H3 for polyubiquitination at K79 via the DCAF8 substrate receptor in hepatocytes...
February 7, 2017: Cell Reports
https://www.readbyqxmd.com/read/28169523/the-suv39h1-protein-lysine-methyltransferase-methylates-chromatin-proteins-involved-in-heterochromatin-formation-and-vdj-recombination
#4
Srikanth Kudithipudi, Maren Kirstin Schuhmacher, Adam Fiseha Kebede, Albert Jeltsch
SUV39H1 is an H3K9 methyltransferase involved in the formation of heterochromatin. We investigated its substrate specificity profile and show recognition of H3 residues between K4 and G12 with highly specific readout of R8. The specificity profile of SUV39H1 is distinct from its paralog SUV39H2, indicating that they can have different additional substrates. Using the specificity profile, several novel SUV39H1 candidate substrates were identified. We observed methylation of 19 novel substrates at the peptide level and for 6 of them at the protein level...
February 7, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28154185/heterochromatin-protein-1%C3%AE-is-a-novel-epigenetic-repressor-of-human-embryonic-%C3%AF%C2%B5-globin-gene-expression
#5
Yadong Wang, Ying Wang, Lingling Ma, Min Nie, Junyi Ju, Ming Liu, Yexuan Deng, Bing Yao, Tao Gui, Xinyu Li, Chan Guo, Chi Ma, Renxiang Tan, Quan Zhao
Production of hemoglobin during development is tightly regulated. For example, expression from the human β-globin gene locus, comprising β-, δ-, ϵ-, and γ-globin genes, switches from ϵ-globin to γ-globin during embryonic development and then from γ-globin to β-globin after birth. Expression of human ϵ-globin in mice has been shown to ameliorate anemia caused by β-globin mutations, including those causing β-thalassemia and sickle cell disease (SCD), raising the prospect that reactivation of ϵ-globin expression could be used in managing these conditions in humans...
February 1, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28153093/human-amniocytes-are-receptive-to-chemically-induced-reprogramming-to-pluripotency
#6
Kate E Hawkins, Dafni Moschidou, Danilo Faccenda, Wasco Wruck, Alex Martin-Trujillo, Kwan-Leong Hau, Anna Maria Ranzoni, Veronica Sanchez-Freire, Fabio Tommasini, Simon Eaton, Paolo De Coppi, David Monk, Michelangelo Campanella, Adrian J Thrasher, James Adjaye, Pascale V Guillot
Restoring pluripotency using chemical compounds alone would be a major step forward in developing clinical-grade pluripotent stem cells, but this has not yet been reported in human cells. We previously demonstrated that VPA_AFS cells, human amniocytes cultivated with valproic acid (VPA) acquired functional pluripotency while remaining distinct from human embryonic stem cells (hESCs), questioning the relationship between the modulation of cell fate and molecular regulation of the pluripotency network. Here, we used single-cell analysis and functional assays to reveal that VPA treatment resulted in a homogeneous population of self-renewing non-transformed cells that fulfill the hallmarks of pluripotency, i...
February 1, 2017: Molecular Therapy: the Journal of the American Society of Gene Therapy
https://www.readbyqxmd.com/read/28148567/critical-role-of-the-camp-pka-pathway-in-hyperglycemia-induced-epigenetic-activation-of-fibrogenic-program-in-the-kidney
#7
Dilip K Deb, Riyue Bao, Yan Chun Li
Hyperglycemia is a major pathogenic factor that promotes diabetic nephropathy, but the underlying mechanism remains incompletely understood. Here, we show that high glucose induced cAMP response element-binding protein (CREB)-binding protein (CBP)-mediated H3K9/14 hyperacetylation in approximately 5000 gene promoters in glomerular mesangial cells, including those of Tgfb1, Tgfb3, and Ctgf, the major profibrotic factors that are known to drive diabetic renal fibrogenesis. In these promoters, H3K9/14 hyperacetylation was closely associated with NF-κB or CREB motifs...
February 1, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28146149/hopx-hypermethylation-promotes-metastasis-via-activating-snail-transcription-in-nasopharyngeal-carcinoma
#8
Xianyue Ren, Xiaojing Yang, Bin Cheng, Xiaozhong Chen, Tianpeng Zhang, Qingmei He, Bin Li, Yingqin Li, Xinran Tang, Xin Wen, Qian Zhong, Tiebang Kang, Musheng Zeng, Na Liu, Jun Ma
Nasopharyngeal carcinoma (NPC) is characterized by a high rate of local invasion and early distant metastasis. Increasing evidence indicates that epigenetic abnormalities play important roles in NPC development. However, the epigenetic mechanisms underlying NPC metastasis remain unclear. Here we investigate aberrantly methylated transcription factors in NPC tissues, and we identify the HOP homeobox HOPX as the most significantly hypermethylated gene. Consistently, we find that HOXP expression is downregulated in NPC tissues and NPC cell lines...
February 1, 2017: Nature Communications
https://www.readbyqxmd.com/read/28143796/clr4-specificity-and-catalytic-activity-beyond-h3k9-methylation
#9
Denis Kusevic, Srikanth Kudithipudi, Nahid Iglesias, Danesh Moazed, Albert Jeltsch
In fission yeast, the catalytic activity of the protein lysine methyltransferase (PKMT) Clr4, the sole homolog of the mammalian SUV39H1 and SUV39H2 enzymes, majorly contributes to the formation of heterochromatin. The enzyme introduces histone 3 lysine 9 (H3K9) di- and tri-methylation, a central heterochromatic histone modification, and later it was also found to methylate the Mlo3 protein, which has a role in heterochromatin formation as well. Herein, we have investigated the substrate specificity of Clr4 using custom made mutational scanning peptide arrays...
January 28, 2017: Biochimie
https://www.readbyqxmd.com/read/28135625/histone-demethylase-kdm3a-a-novel-regulator-of-vascular-smooth-muscle-cells-controls-vascular-neointimal-hyperplasia-in-diabetic-rats
#10
Jing Chen, Jing Zhang, Jian Yang, Lin Xu, Qi Hu, Changwu Xu, Shuo Yang, Hong Jiang
BACKGROUND AND AIMS: Deregulation of histone demethylase KDM3a, an important regulator for H3K9 methylation, is correlated with obesity and abnormal metabolism in rodent models. However, the function of KDM3a in vascular remodeling under diabetic condition is unknown. METHODS: Adenoviruses expressing KDM3a and lentiviruses expressing KDM3a-targeting siRNA were generated to study the role of KDM3a both in vivo and in vitro. The carotid artery balloon injury model was established in diabetic SD rats to evaluate the significance of KDM3a in vascular injury...
December 9, 2016: Atherosclerosis
https://www.readbyqxmd.com/read/28132772/profiling-of-human-epigenetic-regulators-using-a-semi-automated-real-time-qpcr-platform-validated-by-next-generation-sequencing
#11
Amel Dudakovic, Martina Gluscevic, Christopher R Paradise, Halil Dudakovic, Farzaneh Khani, Roman Thaler, Farah S Ahmed, Xiaodong Li, Allan B Dietz, Gary S Stein, Martin A Montecino, David R Deyle, Jennifer J Westendorf, Andre J van Wijnen
Epigenetic mechanisms control phenotypic commitment of mesenchymal stromal/stem cells (MSCs) into osteogenic, chondrogenic or adipogenic lineages. To investigate enzymes and chromatin binding proteins controlling the epigenome, we developed a hybrid expression screening strategy that combines semi-automated real-time qPCR (RT-qPCR), next generation RNA sequencing (RNA-seq), and a novel data management application (FileMerge). This strategy was used to interrogate expression of a large cohort (n>300) of human epigenetic regulators (EpiRegs) that generate, interpret and/or edit the histone code...
April 20, 2017: Gene
https://www.readbyqxmd.com/read/28132760/corrigendum-to-the-role-of-h3k4me3-and-h3k9-14ac-in-the-induction-by-dexamethasone-of-per1-and-sgk1-two-glucocorticoid-early-response-genes-that-mediate-the-effects-of-acute-stress-in-mammals-biochim-biophys-acta-gene-regul-mech-1839-2014-866-872
#12
https://www.readbyqxmd.com/read/28126648/maternal-consumption-of-low-isoflavone-soy-protein-isolate-alters-hepatic-gene-expression-and-liver-development-in-rat-offspring
#13
Sae Bom Won, Anna Han, Young Hye Kwon
In utero environment is known to affect fetal development. Especially, the distinct fetal programming of carcinogenesis was reported in offspring exposed to maternal diets containing soy protein isolate (SPI) or genistein. Therefore, we investigated whether maternal consumption of low-isoflavone SPI or genistein alters hepatic gene expression and liver development in rat offspring. Female Sprague-Dawley rats were fed a casein diet, a low-isoflavone SPI diet or a casein diet supplemented with genistein (250 mg/kg diet) for 2 weeks before mating and throughout pregnancy and lactation...
January 12, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28125586/a-novel-lamin-a-mutant-responsible-for-congenital-muscular-dystrophy-causes-distinct-abnormalities-of-the-cell-nucleus
#14
Alice Barateau, Nathalie Vadrot, Patrick Vicart, Ana Ferreiro, Michèle Mayer, Delphine Héron, Corinne Vigouroux, Brigitte Buendia
A-type lamins, the intermediate filament proteins participating in nuclear structure and function, are encoded by LMNA. LMNA mutations can lead to laminopathies such as lipodystrophies, premature aging syndromes (progeria) and muscular dystrophies. Here, we identified a novel heterozygous LMNA p.R388P de novo mutation in a patient with a non-previously described severe phenotype comprising congenital muscular dystrophy (L-CMD) and lipodystrophy. In culture, the patient's skin fibroblasts entered prematurely into senescence, and some nuclei showed a lamina honeycomb pattern...
2017: PloS One
https://www.readbyqxmd.com/read/28111052/activated-p300-acetyltransferase-activity-modulates-aortic-valvular-calcification-with-osteogenic-transdifferentiation-and-downregulation-of-klotho
#15
Shao-Jung Li, Yu-Hsun Kao, Cheng-Chih Chung, Wei-Yu Chen, Wan-Li Cheng, Yi-Jen Chen
BACKGROUND: The calcific aortic valve (AV) disease is a common disease with the unclear mechanism, and optimal pharmacological treatment remains unavailable. Epigenetic modulation by histone acetyltransferase (HAT) plays a critical role in osteogenic transdifferentiation and atherosclerosis. The purposes of this study were to investigate whether HAT contributes to the pathophysiology of AV calcification and assess the therapeutic potential of HAT inhibition. METHODS: Porcine valvular interstitial cells (VICs) were treated with osteogenic medium (10ng/mL of tumor necrosis factor-α and 4mmol/L of high phosphate) for 7days...
January 5, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28109694/sirt1-as-a-potential-biomarker-of-response-to-treatment-with-glatiramer-acetate-in-multiple-sclerosis
#16
Daniel Hewes, Alexandru Tatomir, Adam M Kruszewski, Gautam Rao, Cosmin A Tegla, Jonathan Ciriello, Vingh Nguyen, Walter Royal, Christopher Bever, Violeta Rus, Horea Rus
SIRT1, a NAD dependent histone and protein deacetylase, is a member of the histone deacetylase class III family. We previously showed that SIRT1 mRNA expression is significantly lower in peripheral blood mononuclear cells (PBMCs) of multiple sclerosis (MS) patients during relapses than in stable patients. We have now investigated SIRT1 as a possible biomarker to predict relapse as well as responsiveness to glatiramer acetate (GA) treatment in relapsing-remitting MS (RRMS) patients. Over the course of 2years, a cohort of 15 GA-treated RRMS patients were clinically monitored using the Expanded Disability Status Scale and assessed for MS relapses...
January 19, 2017: Experimental and Molecular Pathology
https://www.readbyqxmd.com/read/28108585/histone-h3k4-and-h3k36-methylation-independently-recruit-the-nua3-histone-acetyltransferase-in-saccharomyces-cerevisiae
#17
Benjamin J E Martin, Kristina L McBurney, Vicki E Maltby, Kristoffer N Jensen, Julie Brind'Amour, LeAnn Howe
Histone post-translational modifications (PTMs) alter chromatin structure by promoting the interaction of chromatin-modifying complexes with nucleosomes. The majority of chromatin-modifying complexes contain multiple domains that preferentially interact with modified histones, leading to speculation that these domains function in concert to target nucleosomes with distinct combinations of histone PTMs. In S. cerevisiae, the NuA3 histone acetyltransferase complex contains three domains, the PHD finger in Yng1, the PWWP domain in Pdp3, and the YEATS domain in Taf14, which in vitro bind to H3K4 methylation, H3K36 methylation, and acetylated and crotonylated H3K9 respectively...
January 20, 2017: Genetics
https://www.readbyqxmd.com/read/28100676/gene-body-chromatin-modification-dynamics%C3%A2-mediate-epigenome-differentiation-in%C3%A2-arabidopsis
#18
Soichi Inagaki, Mayumi Takahashi, Aoi Hosaka, Tasuku Ito, Atsushi Toyoda, Asao Fujiyama, Yoshiaki Tarutani, Tetsuji Kakutani
Heterochromatin is marked by methylation of lysine 9 on histone H3 (H3K9me). A puzzling feature of H3K9me is that this modification localizes not only in promoters but also in internal regions (bodies) of silent transcription units. Despite its prevalence, the biological significance of gene-body H3K9me remains enigmatic. Here we show that H3K9me-associated removal of H3K4 monomethylation (H3K4me1) in gene bodies mediates transcriptional silencing. Mutations in an Arabidopsis H3K9 demethylase gene IBM1 induce ectopic H3K9me2 accumulation in gene bodies, with accompanying severe developmental defects...
January 18, 2017: EMBO Journal
https://www.readbyqxmd.com/read/28098854/lsd1-sustains-estrogen-driven-endometrial-carcinoma-cell-proliferation-through-the-pi3k-akt-pathway-via-di-demethylating-h3k9-of-cyclin%C3%A2-d1
#19
Chunqin Chen, Yanan Wang, Shiyu Wang, Yuan Liu, Jiawen Zhang, Yuyao Xu, Zhenbo Zhang, Wei Bao, Sufang Wu
A recent study reported that histone lysine specific demethylase 1 (LSD1, KDM1A) is overexpressed in endometrioid endometrial carcinoma (EEC) and associated with tumor progression as well as poor prognosis. However, the physiological function and mechanism of LSD1 in endometrial cancer (EC) remains largely unknown. In this study, we demonstrate that β-estradiol (E2) treatment increased LSD1 expression via the GPR30/PI3K/AKT pathway in endometrial cancer cells. Both siGPR30 and the PI3K inhibitor LY294002 block this effect...
March 2017: International Journal of Oncology
https://www.readbyqxmd.com/read/28096401/ornithine-decarboxylase-regulates-m1-macrophage-activation-and-mucosal-inflammation-via-histone-modifications
#20
Dana M Hardbower, Mohammad Asim, Paula B Luis, Kshipra Singh, Daniel P Barry, Chunying Yang, Meredith A Steeves, John L Cleveland, Claus Schneider, M Blanca Piazuelo, Alain P Gobert, Keith T Wilson
Macrophage activation is a critical step in host responses during bacterial infections. Ornithine decarboxylase (ODC), the rate-limiting enzyme in polyamine metabolism, has been well studied in epithelial cells and is known to have essential roles in many different cellular functions. However, its role in regulating macrophage function during bacterial infections is not well characterized. We demonstrate that macrophage-derived ODC is a critical regulator of M1 macrophage activation during both Helicobacter pylori and Citrobacter rodentium infection...
January 31, 2017: Proceedings of the National Academy of Sciences of the United States of America
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