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Histone H4

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https://www.readbyqxmd.com/read/29159556/effects-of-arsenic-trioxide-on-inf-gamma-gene-expression-in-mrl-lpr-mice-and-human-lupus
#1
Hongye Hu, Enjiu Chen, Yongji Li, Xiaochun Zhu, Ting Zhang, Xiaofang Zhu
Arsenic trioxide (As2O3; ATO), a traditional Chinese medicine, is used to treat patients with acute promye-locytic leukemia, while its application for treatment of systemic lupus erythematosus (SLE) is still under evaluation. The high expression of INF-gamma (INF-γ) is a primary pathogenic factor in SLE. It is found that ATO can reduce INF-γ expression levels in lupus-prone mice, whereas it is not clear whether ATO has the same effect on SLE patients. Therefore, this study was to investigate the underlying mechanism of the effects of ATO on the expression of INF-γ in splenocytes of MRL/lpr mice and PBMCs of human lupus...
November 20, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/29157222/comparative-proteomics-reveals-the-physiological-differences-between-winter-tender-shoots-and-spring-tender-shoots-of-a-novel-tea-camellia-sinensis-l-cultivar-evergrowing-in-winter
#2
Shengjie Liu, Jiadong Gao, Zhongjian Chen, Xiaoyan Qiao, Hualin Huang, Baiyuan Cui, Qingfeng Zhu, Zhangyan Dai, Hualing Wu, Yayan Pan, Chengwei Yang, Jun Liu
BACKGROUND: A recently discovered tea [Camellia sinensis (L.) O. Kuntze] cultivar can generate tender shoots in winter. We performed comparative proteomics to analyze the differentially accumulated proteins between winter and spring tender shoots of this clonal cultivar to reveal the physiological basis of its evergrowing character during winter. RESULTS: We extracted proteins from the winter and spring tender shoots (newly formed two leaves and a bud) of the evergrowing tea cultivar "Dongcha11" respectively...
November 20, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/29155286/sulfur-mustard-induced-epigenetic-modifications-over-time-a-pilot-study
#3
Thilo Simons, Dirk Steinritz, Birgit Bölck, Annette Schmidt, Tanja Popp, Horst Thiermann, Thomas Gudermann, Wilhelm Bloch, Kai Kehe
The chemical warfare agent sulfur mustard (SM) can cause long-term health effects that may occur even years after a single exposure. The underlying pathophysiology is unknown, but epigenetic mechanisms are discussed as feasible explanation. "Epigenetics" depicts regulation of gene function without affecting the DNA sequence itself. DNA-methylation and covalent histone modifications (methylation or acetylation) are regarded as important processes. In the present in vitro study using early endothelial cells (EEC), we analyzed SM-induced DNA methylation over time and compared results to an in vivo skin sample that was obtained approx...
November 16, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/29155171/manganese-chloride-induces-histone-acetylation-changes-in-neuronal-cells-its-role-in-manganese-induced-damage
#4
Zhenkun Guo, Zhipeng Zhang, Qingqing Wang, Jie Zhang, Lijin Wang, Qunwei Zhang, Huangyuan Li, Siying Wu
Manganese neurotoxicity presents with Parkinson-like symptoms, with degeneration of dopaminergic neurons in the basal ganglia as the principal pathological feature. Manganese neurotoxicity studies may contribute to a better understanding of the mechanism of Parkinson's disease. Here, we examined the effects of manganese on histone acetylation, a major epigenetic change in chromatin that can regulate gene expression, chromatin remodelling, cell cycle progression, DNA repair and apoptosis. In this study, we found that manganese chloride (MnCl2) may significantly suppress the acetylation of histone H3 and H4 in PC12 cells and SHSY5Y cells in a time-dependent manner...
November 16, 2017: Neurotoxicology
https://www.readbyqxmd.com/read/29150847/chronic-sun-exposure-is-associated-with-distinct-histone-acetylation-changes-in-human-skin
#5
S Ding, J Chen, Q Zeng, J Lu, L Tan, A Guo, J Kang, S Yang, Y Xiang, C Zuo, J Huang
BACKGROUND: Photoaging is attributed to continuous sunlight or artificial UV exposure and manifests the clinical and histological changes of skin. Epigenetic changes have been found to be involved in the pathogenesis of photoaging. However, the underlying mechanisms are unclear. OBJECTIVES: To analyse histone modification patterns in sun-exposed and non-exposed skins, and identify the abnormally histone modified-genes related to photoaging. METHODS: Skin biopsies were collected both from the outer forearm (sun-exposed area) and the buttock (sun-protected area) in 20 healthy middle-aged female volunteers...
November 18, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/29142617/acute-strenuous-exercise-induces-an-imbalance-on-histone-h4-acetylation-histone-deacetylase-2-and-increases-the-proinflammatory-profile-of-pbmc-of-obese-individuals
#6
Gilson P Dorneles, Maria Carolina R Boeira, Lucas L Schipper, Ivy R V Silva, Viviane R Elsner, Pedro Dal Lago, Alessandra Peres, Pedro R T Romão
This study evaluated the response of global histone H4 acetylation (H4ac), histone deacetylase 2 (HDAC2) activity, as well as the production of proinflammatory cytokines and monocyte phenotypes of lean and obese males after exercise. Ten lean and ten obese sedentary men were submitted to one session of strenuous exercise, and peripheral blood mononuclear cells (PBMC) were stimulated in vitro with lipopolysaccharide (LPS). Global H4ac levels, HDAC2 activity in PBMC, and IL-6, IL-8, and TNF-α production were analyzed...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29142304/maternal-exposure-to-iodine-excess-throughout-pregnancy-and-lactation-induces-hypothyroidism-in-adult-male-rat-offspring
#7
Caroline Serrano-Nascimento, Rafael Barrera Salgueiro, Thiago Pantaleão, Vânia Maria Corrêa da Costa, Maria Tereza Nunes
This study aimed to investigate the consequences of maternal exposure to iodine excess (IE; 0.6 mg NaI/L) throughout pregnancy and lactation on the hypothalamus-pituitary-thyroid axis of the male offspring in adulthood. Maternal IE exposure increased hypothalamic Trh mRNA expression and pituitary Tsh expression and secretion in the adult male offspring. Moreover, the IE-exposed offspring rats presented reduced thyroid hormones levels, morphological alterations in the thyroid follicles, increased thyroid oxidative stress and decreased expression of thyroid differentiation markers (Tshr, Nis, Tg, Tpo, Mct8) and thyroid transcription factors (Nkx2...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29141908/two-distinct-regulatory-mechanisms-of-transcriptional-initiation-in-response-to-nutrient-signaling
#8
Jannatul Ferdoush, Rwik Sen, Amala Kaja, Priyanka Barman, Sukesh R Bhaumik
SAGA (Spt-Ada-Gcn5-Acetyltransferase) and TFIID (transcription factor IID) have been previously shown to facilitate the PIC (pre-initiation complex) formation at the promoters of two distinct sets of genes. Here, we demonstrate that TFIID and SAGA differentially participate in stimulation of the PIC formation (and hence transcriptional initiation) at the promoter of PHO84, a gene for high affinity inorganic phosphate (Pi) transporter for crucial cellular functions, in response to nutrient signaling. We show that transcriptional initiation of PHO84 occurs predominantly in the TFIID-dependent manner in the absence of Pi in the growth medium...
November 15, 2017: Genetics
https://www.readbyqxmd.com/read/29138512/proteome-wide-identification-of-lysine-2-hydroxyisobutyrylation-reveals-conserved-and-novel-histone-modifications-in-physcomitrella-patens
#9
Zhiming Yu, Jun Ni, Wei Sheng, Zhikun Wang, Yuhuan Wu
Protein lysine 2-hydroxyisobutyrylation (Khib) is a newly identified post-translational modification found in animal and yeast cells. Previous research suggested that histone Khib is involved in male cell differentiation and plays a critical role in the regulation of chromatin functions in animals. However, information regarding protein Khib in plants is still limited. In this study, using a specific antibody and LC-MS/MS methods, we identified 11,976 Khib sites in 3,001 proteins in Physcomitrella patens. The bioinformatics analysis indicated that these Khib-modified proteins were involved in a wide range of molecular functions and cellular processes, and showed diverse subcellular localizations...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29133310/convergent-origination-of-a-drosophila-like-dosage-compensation-mechanism-in-a-reptile-lineage
#10
Ray Marin, Diego Cortez, Francesco Lamanna, Madapura M Pradeepa, Evgeny Leushkin, Philippe Julien, Angélica Liechti, Jean Halbert, Thoomke Brüning, Katharina Mössinger, Timo Trefzer, Christian Conrad, Halie N Kerver, Juli Wade, Patrick Tschopp, Henrik Kaessmann
Sex chromosomes differentiated from different ancestral autosomes in various vertebrate lineages. Here, we trace the functional evolution of the XY Chromosomes of the green anole lizard (Anolis carolinensis), on the basis of extensive high-throughput genome, transcriptome and histone modification sequencing data and revisit dosage compensation evolution in representative mammals and birds with substantial new expression data. Our analyses show that Anolis sex chromosomes represent an ancient XY system that originated at least ≈160 million years ago in the ancestor of Iguania lizards, shortly after the separation from the snake lineage...
November 13, 2017: Genome Research
https://www.readbyqxmd.com/read/29128564/epigenetic-mechanisms-of-atm-activation-after-helicobacter-pylori-infection
#11
Juliana Carvalho Santos, Rafael Zuppardo Gambeloni, Aline Tengan Roque, Sebastian Oeck, Marcelo Lima Ribeiro
Gastric cancer (GC) is the second leading cause of cancer-related mortality worldwide. The disease develops from the accumulation of several genetic and epigenetic changes. Among other risk factors, Helicobacter pylori infection is considered the main driving factor of GC development. H. pylori infection increases DNA damage levels and leads to epigenetic dysregulation, which may favor gastric carcinogenesis. An early step in double strand break repair is the recruitment of (ataxia-telangiectasia mutated serine/threonine kinase (ATM) to the damaged site, where it plays a key role in advancing the DNA damage checkpoint process...
November 8, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/29127188/epigenetically-mediated-inhibition-of-s-adenosylhomocysteine-hydrolase-and-the-associated-dysregulation-of-1-carbon-metabolism-in-nonalcoholic-steatohepatitis-and-hepatocellular-carcinoma
#12
Igor P Pogribny, Kostiantyn Dreval, Iryna Kindrat, Stepan Melnyk, Leandro Jimenez, Aline de Conti, Volodymyr Tryndyak, Marta Pogribna, Juliana Festa Ortega, S Jill James, Ivan Rusyn, Frederick A Beland
The substantial rise in the prevalence of nonalcoholic steatohepatitis (NASH), an advanced form of nonalcoholic fatty liver disease, and the strong association between NASH and the development of hepatocellular carcinoma indicate the urgent need for a better understanding of the underlying mechanisms. In the present study, by using the Stelic animal model of NASH and NASH-derived liver carcinogenesis, we investigated the role of the folate-dependent 1-carbon metabolism in the pathogenesis of NASH. We demonstrated that advanced NASH and NASH-related liver carcinogenesis are characterized by a significant dysregulation of 1-carbon homeostasis, with diminished expression of key 1-carbon metabolism genes, especially a marked inhibition of the S-adenosylhomocysteine hydrolase (Ahcy) gene and an increased level of S-adenosyl-l-homocysteine (SAH)...
November 10, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29117594/histones-and-chymotrypsin-like-elastases-play-significant-roles-in-the-antimicrobial-activity-of-tongue-sole-neutrophil-extracellular-traps
#13
Li-Lian Wen, Ming-Li Zhao, Heng Chi, Li Sun
Neutrophil extracellular traps (NETs) are a form of extracellular antimicrobial structure of neutrophils observed in higher and lower vertebrates, the latter including the teleost fish tongue sole Cynoglossus semilaevis. However, the antimicrobial mechanism of fish NETs is unknown. In the present study, we examined the potential contribution of histones and elastases to the antibacterial effect of tongue sole NETs. For this purpose, two histones (CsH2B and CsH4) and two elastases (CsEla1 and CsEla2) of tongue sole were investigated...
November 5, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29117212/quantitative-label-free-proteomic-analysis-of-human-urine-to-identify-novel-candidate-protein-biomarkers-for-schistosomiasis
#14
Olugbenga Samson Onile, Bridget Calder, Nelson C Soares, Chiaka I Anumudu, Jonathan M Blackburn
BACKGROUND: Schistosomiasis is a chronic neglected tropical disease that is characterized by continued inflammatory challenges to the exposed population and it has been established as a possible risk factor in the aetiology of bladder cancer. Improved diagnosis of schistosomiasis and its associated pathology is possible through mass spectrometry to identify biomarkers among the infected population, which will influence early detection of the disease and its subtle morbidity. METHODOLOGY: A high-throughput proteomic approach was used to analyse human urine samples for 49 volunteers from Eggua, a schistosomiasis endemic community in South-West, Nigeria...
November 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29115969/correction-to-nua4-histone-acetyltransferase-activity-is-required-for-h4-acetylation-on-a-dosage-compensated-monosomic-chromosome-that-confers-resistance-to-fungal-toxins
#15
Hironao Wakabayashi, Christopher Tucker, Gabor Bethlendy, Anatoliy Kravets, Stephen L Welle, Michael Bulger, Jeffrey J Hayes, Elena Rustchenko
After the publication of this work [1], it was noticed that an initial was missing from the author name: Jeffrey Hayes. His name should be written as: Jeffrey J. Hayes.
November 7, 2017: Epigenetics & Chromatin
https://www.readbyqxmd.com/read/29109148/histone-deacetylase-8-substrate-selectivity-is-determined-by-long-and-short-range-interactions-leading-to-enhanced-reactivity-for-full-length-histone-substrates-compared-to-peptides
#16
Carol Ann Castaneda, Noah A Wolfson, Katherine R Leng, Yin-Ming Kuo, Andrew J Andrews, Carol A Fierke
Histone deacetylases (HDACs) catalyze deacetylation of acetyl-lysine residues within proteins. To date, HDAC substrate specificity and selectivity have been largely estimated using peptide substrates. However, it is unclear whether peptide substrates accurately reflect the substrate selectivity of HDAC8 toward full-length proteins. Here, we compare HDAC8 substrate selectivity in the context of peptides, full-length proteins, and protein-nucleic acid complexes. We demonstrate that HDAC8 catalyzes deacetylation of tetrameric histone (H3/H4) substrates with catalytic efficiencies that are 40- to 300-fold higher than those for corresponding peptide substrates...
November 6, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29108192/-protective-effect-of-the-histone-deacetylase-inhibitor-acy1215-against-brain-edema-in-mice-with-acute-liver-failure
#17
F Z Jiao, H Y Zhang, F Yang, L W Wang, Z J Gong
Objective: To investigate the protective effect of ACY1215 (Rocilinostat), a histone deacetylase inhibitor, against brain edema in mice with acute liver failure. Methods: Lipopolysaccharide combined with D-galactosamine was used to establish a mouse model of acute liver failure, and ACY1215 was used for intervention. The effect of ACY1215 on histopathological changes of the liver was observed after 24 hours, as well as the changes in alanine aminotransferase (ALT), aspartate aminotransferase (AST), blood ammonia, tumor necrosis factor-α (TNF-α), interferon-γ (IFN-γ), brain water content, blood-brain barrier structure, NF-κB-p65, histone, acetylated histone, and TNF-α mRNA in brain tissue...
September 20, 2017: Zhonghua Gan Zang Bing za Zhi, Zhonghua Ganzangbing Zazhi, Chinese Journal of Hepatology
https://www.readbyqxmd.com/read/29107335/analysis-of-chromatin-opening-in-heterochromatic-non-small-cell-lung-cancer-tumor-initiating-cells-in-relation-to-dna-damaging-antitumor-treatment
#18
Mina Eriksson, Petra Hååg, Beata Brzozowska, Magdalena Lipka, Halina Lisowska, Rolf Lewensohn, Andrzej Wojcik, Kristina Viktorsson, Lovisa Lundholm
PURPOSE: We previously reported that sphere-forming non-small cell lung cancer (NSCLC) tumor-initiating cells (TICs) have an altered activation of DNA damage response- and repair proteins and are refractory to DNA-damaging treatments. We analyzed whether chromatin organization plays a role in the observed refractoriness. METHODS AND MATERIALS: Bulk cells and TICs from the NSCLC H23 and H1299 cell lines were examined using cell viability, clonogenic survival, Western blot, short interfering RNA analysis, and micronucleus assay...
September 22, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/29104064/a-chemical-proteomics-approach-to-reveal-direct-protein-protein-interactions-in-living-cells
#19
Ralph E Kleiner, Lisa E Hang, Kelly R Molloy, Brian T Chait, Tarun M Kapoor
Protein-protein interactions mediate essential cellular processes, however the detection of native interactions is challenging since they are often low affinity and context dependent. Here, we develop a chemical proteomics approach in vivo CLASPI [iCLASPI] (in vivo crosslinking-assisted and stable isotope labeling by amino acids in cell culture [SILAC]-based protein identification) relying upon photo-crosslinking, amber suppression, and SILAC-based quantitative proteomics to profile context-dependent protein-protein interactions in living cells...
October 25, 2017: Cell Chemical Biology
https://www.readbyqxmd.com/read/29102179/discovery-of-a-fluorescent-probe-with-hdac6-selective-inhibition
#20
Yingjie Zhang, Jin Yan, Tso-Pang Yao
There is increasing interest in discovering HDAC6 selective inhibitors as chemical probes to elucidate the biological functions of HDAC6 and ultimately as new therapeutic agents. Small-molecular fluorescent probes are widely used to detect target protein location and function, identify protein complex composition in biological processes of interest. In the present study, structural modification of the previously reported compound 4MS leads to two novel fluorescent HDAC inhibitors, 6a and 6b. Determination of IC50 values against the panel of Zn(2+) dependent HDACs (HDAC1-11) reveals that 6b is a HDAC6 selective inhibitor, which can induce hyperacetylation of tubulin but not histone H4...
December 1, 2017: European Journal of Medicinal Chemistry
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