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https://www.readbyqxmd.com/read/29063469/effect-of-modified-wuzi-yanzong-pill-on-tip60-mediated-apoptosis-in-testis-of-male-rats-after-microwave-radiation
#1
Hai-Xiang Hu, Jing Sun, Ya-Jing Gao, Hong Fang, Shao-Qiang Xu, Jing Dong, Li-Zhao Wei, Shao-Bo Luo, Chuan-Yun Shen, Qi-Long Zhang, Ya-Lan Xie
OBJECTIVE: To investigate the effect of a modified Wuzi Yanzong Pill (, WZYZP) on the male rats' testis after microwave radiation, as well as its potential mechanism. METHODS: Forty-five male rats were randomly assigned to three groups: the control group, the radiation group, and the WZYZP group. The rats in the radiation group and WZYZP group were exposed to microwave radiation for 15 min once, while the rats in the control group were not exposed to any radiation...
October 24, 2017: Chinese Journal of Integrative Medicine
https://www.readbyqxmd.com/read/29045464/tip60-represses-telomerase-expression-by-inhibiting-sp1-binding-to-the-tert-promoter
#2
Deepa Rajagopalan, Amit Kumar Pandey, Magdalene Claire Xiuzhen, Kwok Kin Lee, Shainan Hora, Yanzhou Zhang, Boon Haow Chua, Hui Si Kwok, Shreshtha Sailesh Bhatia, Lih Wen Deng, Daniel G Tenen, Dennis Kappei, Sudhakar Jha
HIV1-TAT interactive protein (TIP60) is a haploinsufficient tumor suppressor. However, the potential mechanisms endowing its tumor suppressor ability remain incompletely understood. It plays a vital role in virus-induced cancers where TIP60 down-regulates the expression of human papillomavirus (HPV) oncoprotein E6 which in turn destabilizes TIP60. This intrigued us to identify the role of TIP60, in the context of a viral infection, where it is targeted by oncoproteins. Through an array of molecular biology techniques such as Chromatin immunoprecipitation, expression analysis and mass spectrometry, we establish the hitherto unknown role of TIP60 in repressing the expression of the catalytic subunit of the human telomerase complex, TERT, a key driver for immortalization...
October 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/29040603/mitosis-specific-acetylation-tunes-ran-effector-binding-for-chromosome-segregation
#3
Xiaoling Bao, Heng Liu, Xing Liu, Ke Ruan, Yonghui Zhang, Zhiyong Zhang, Qi Hu, Ying Liu, Saima Akram, Jiahai Zhang, Qingguo Gong, Wenwen Wang, Xiao Yuan, Jian Li, Lingli Zhao, Zhen Dou, Ruijun Tian, Xuebiao Yao, Jihui Wu, Yunyu Shi
Stable transmission of genetic information during cell division requires faithful mitotic spindle assembly and chromosome segregation. The Ran GTPase plays a key role in mitotic spindle assembly. However, how the generation of a chemical gradient of Ran-GTP at the spindle is coupled to mitotic post-translational modifications has never been characterized. Here, we solved the complex structure of Ran with the nucleotide release factor Mog1 and delineated a novel mitosis-specific acetylation-regulated Ran-Mog1 interaction during chromosome segregation...
October 6, 2017: Journal of Molecular Cell Biology
https://www.readbyqxmd.com/read/29018219/spatially-restricted-loading-of-brd2-at-dna-double-strand-breaks-protects-h4-acetylation-domains-and-promotes-dna-repair
#4
Ozge Gursoy-Yuzugullu, Chelsea Carman, Brendan D Price
The n-terminal tail of histone H4 recruits repair proteins, including 53BP1, to DNA double-strand breaks (DSB) and undergoes dynamic acetylation during DSB repair. However, how H4 acetylation (H4Ac) recruits repair proteins and reorganizes chromatin during DNA repair is unclear. Here, we show that the bromodomain protein BRD2 is recruited to DSBs. This recruitment requires binding of BRD2's tandem bromodomains to H4Ac, which is generated at DSBs by the Tip60/KAT5 acetyltransferase. Binding of BRD2 to H4Ac protects the underlying acetylated chromatin from attack by histone deacetylases and allows acetylation to spread along the flanking chromatin...
October 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28977657/h2ax-facilitates-classical-non-homologous-end-joining-at-the-expense-of-limited-nucleotide-loss-at-repair-junctions
#5
Yi-Li Feng, Ji-Feng Xiang, Si-Cheng Liu, Tao Guo, Guo-Fang Yan, Ye Feng, Na Kong, Hao-Dan Li, Yang Huang, Hui Lin, Xiu-Jun Cai, An-Yong Xie
Phosphorylated histone H2AX, termed 'γH2AX', mediates the chromatin response to DNA double strand breaks (DSBs) in mammalian cells. H2AX deficiency increases the numbers of unrepaired DSBs and translocations, which are partly associated with defects in non-homologous end joining (NHEJ) and contributing to genomic instability in cancer. However, the role of γH2AX in NHEJ of general DSBs has yet to be clearly defined. Here, we showed that despite little effect on overall NHEJ efficiency, H2AX deficiency causes a surprising bias towards accurate NHEJ and shorter deletions in NHEJ products...
October 13, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28894190/novel-detection-of-post-translational-modifications-in-human-monocyte-derived-dendritic-cells-after-chronic-alcohol-exposure-role-of-inflammation-regulator-h4k12ac
#6
Tiyash Parira, Gloria Figueroa, Alejandra Laverde, Gianna Casteleiro, Mario E Gomez Hernandez, Francisco Fernandez-Lima, Marisela Agudelo
Previous reports on epigenetic mechanisms involved in alcohol abuse have focus on hepatic and neuronal regions, leaving the immune system and specifically monocyte-derived dendritic cells (MDDCs) understudied. Our lab has previously shown histone deacetylases are modulated in cells derived from alcohol users and after in vitro acute alcohol treatment of human MDDCs. In the current study, we developed a novel screening tool using matrix assisted laser desorption ionization-fourier transform-ion cyclotron resonance mass spectrometry (MALDI-FT-ICR MS) and single cell imaging flow cytometry to detect post-translational modifications (PTMs) in human MDDCs due to chronic alcohol exposure...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28884217/critical-genomic-regulation-mediated-by-enhancer-of-polycomb
#7
REVIEW
Naomi E Searle, Lorraine Pillus
Enhancer of Polycomb (EPC) was first identified for its contributions to development in Drosophila and was soon-thereafter purified as a subunit of the NuA4/TIP60 acetyltransferase complex. Since then, EPC has often been left in the shadows as an essential, yet non-catalytic subunit of NuA4/TIP60; however, its deep conservation and disease association make clear that it warrants additional attention. In fact, recent studies in yeast demonstrated that its Enhancer of Polycomb, Epl1, was just as important for gene expression and acetylation as is the catalytic subunit of NuA4...
September 7, 2017: Current Genetics
https://www.readbyqxmd.com/read/28884116/the-role-of-pontin-and-reptin-in-cellular-physiology-and-cancer-etiology
#8
REVIEW
Yu-Qian Mao, Walid A Houry
Pontin (RUVBL1, TIP49, TIP49a, Rvb1) and Reptin (RUVBL2, TIP48, TIP49b, Rvb2) are highly conserved ATPases of the AAA+ (ATPases Associated with various cellular Activities) superfamily and are involved in various cellular processes that are important for oncogenesis. First identified as being upregulated in hepatocellular carcinoma and colorectal cancer, their overexpression has since been shown in multiple cancer types such as breast, lung, gastric, esophageal, pancreatic, kidney, bladder as well as lymphatic, and leukemic cancers...
2017: Frontiers in Molecular Biosciences
https://www.readbyqxmd.com/read/28873018/tip60-histone-acetyltransferase-in-adipose-tissue-possible-linkages-with-breast-cancer-development
#9
Gaëlle Judes, Lucas Dubois, Khaldoun Rifaï, Marine Daures, Mouhamed Idrissou, Yves-Jean Bignon, Frédérique Penault-Llorca, Dominique Bernard-Gallon
No abstract text is available yet for this article.
November 2017: Omics: a Journal of Integrative Biology
https://www.readbyqxmd.com/read/28871603/targeting-histone-acetyltransferase-tip60-inhibits-intestinal-allergy
#10
Gui Yang, Bao-Hui Cheng, Shao-Bo Yang, Zhi-Qiang Liu, Shu-Qi Qiu, Li-Tao Yang, Rui-Di Xie, Xiao-Rui Geng, Mao-Gang Li, Lin Gao, Zhi-Gang Liu, Ping-Chang Yang
BACKGROUND: The over production of IgE plays a critical role in the pathogenesis of allergy; the mechanism is unclear. Histone acetyltransferase (HAT) activities are required in gene transcription of a large number of molecules in the immune system of the body. OBJECTIVES: This study tests a hypothesis that HAT Tat-interactive protein 60 (Tip60) plays an important role in the initiation of IgE-mediated allergy. METHODS: The effects of Tip60 on regulating IgE expression were assessed with B cells...
September 4, 2017: Allergy
https://www.readbyqxmd.com/read/28837777/arsenite-binds-to-the-zinc-finger-motif-of-tip60-histone-acetyltransferase-and-induces-its-degradation-via-the-26s-proteasome
#11
Lok Ming Tam, Ji Jiang, Pengcheng Wang, Lin Li, Weili Miao, Xuejiao Dong, Yinsheng Wang
Arsenic is a ubiquitous environmental contaminant with widespread public health concern. Epidemiological studies have revealed that chronic human exposure to arsenic in drinking water is associated with the prevalence of skin, lung, and bladder cancers. Aberrant histone modifications (e.g., methylation, acetylation, and ubiquitination) were previously found to be accompanied by arsenic exposure; thus, perturbation of epigenetic pathways is thought to contribute to arsenic carcinogenesis. Arsenite is known to interact with zinc finger motifs of proteins, and zinc finger motif is present in and indispensable for the enzymatic activities of crucial histone-modifying enzymes especially the MYST family of histone acetyltransferases (e...
September 18, 2017: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/28819431/tat-interactive-protein-60kda-tip60-regulates-the-tumorigenesis-of-lung-cancer-in-vitro
#12
Yang Yang, Jian Sun, Ting Chen, Zengyue Tao, Xianwei Zhang, Feng Tian, Xiao Zhou, Daru Lu
Histone acetyltransferases (HATs) play vital functions in the tumorigenesis of many solid organ malignancies. We previously screened a human HATs cDNA library and identified Tat-interactive protein-60KDa (TIP60) as a candidate critical HATs in the origination of lung cancer. In this study, our data suggested that overexpression of TIP60 inhibited the cell viability of A549 and H1299 cells since day 2. Compared to the control group, the viability of these two lung cancer cells was inhibited by 25% and 19% at day 6 with the overexpression of TIP60...
2017: Journal of Cancer
https://www.readbyqxmd.com/read/28794203/the-myst-family-histone-acetyltransferase-complex-regulates-stress-resistance-and-longevity-through-transcriptional-control-of-daf-16-foxo-transcription-factors
#13
Takako Ikeda, Masaharu Uno, Sakiko Honjoh, Eisuke Nishida
The well-known link between longevity and the Sir2 histone deacetylase family suggests that histone deacetylation, a modification associated with repressed chromatin, is beneficial to longevity. However, the molecular links between histone acetylation and longevity remain unclear. Here, we report an unexpected finding that the MYST family histone acetyltransferase complex (MYS-1/TRR-1 complex) promotes rather than inhibits stress resistance and longevity in Caenorhabditis elegans Our results show that these beneficial effects are largely mediated through transcriptional up-regulation of the FOXO transcription factor DAF-16...
August 9, 2017: EMBO Reports
https://www.readbyqxmd.com/read/28783662/suppression-by-human-foxp3-regulatory-t-cells-requires-foxp3-tip60-interactions
#14
Khalid Bin Dhuban, Eva d'Hennezel, Yasuhiro Nagai, Yan Xiao, Steven Shao, Roman Istomine, Fernando Alvarez, Moshe Ben-Shoshan, Hans Ochs, Bruce Mazer, Bin Li, Chiyoko Sekine, Alan Berezov, Wayne Hancock, Troy R Torgerson, Mark I Greene, Ciriaco A Piccirillo
CD4(+)FOXP3(+) regulatory T (Treg) cells are critical mediators of immune tolerance, and their deficiency owing to FOXP3 mutations in immunodysregulation polyendocrinopathy enteropathy X-linked syndrome (IPEX) patients results in severe autoimmunity. Different FOXP3 mutations result in a wide range of disease severity, reflecting the relative importance of the affected residues in the integrity of the FOXP3 protein and its various molecular interactions. We characterized the cellular and molecular impact of the most common IPEX mutation, p...
June 16, 2017: Science Immunology
https://www.readbyqxmd.com/read/28717171/the-aspirin-metabolite-salicylate-inhibits-lysine-acetyltransferases-and-muc1-induced-epithelial-to-mesenchymal-transition
#15
Harvey R Fernandez, Sara K Lindén
MUC1 is a transmembrane mucin that can promote cancer progression, and its upregulation correlates with a worse prognosis in colon cancer. We examined the effects of overexpression of MUC1 in colon cancer cells, finding that it induced epithelial to mesenchymal transition (EMT), including enhanced migration and invasion, and increased Akt phosphorylation. When the clones were treated with the aspirin metabolite salicylate, Akt phosphorylation was decreased and EMT inhibited. As the salicylate motif is necessary for the activity of the lysine acetyltransferase (KAT) inhibitor anacardic acid, we hypothesized these effects were associated with the inhibition of KAT activity...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28714971/budding-yeast-wee1-distinguishes-spindle-pole-bodies-to-guide-their-pattern-of-age-dependent-segregation
#16
Jette Lengefeld, Manuel Hotz, Meaghen Rollins, Kristin Baetz, Yves Barral
Many asymmetrically dividing cells unequally partition cellular structures according to age. Yet, it is unclear how cells differentiate pre-existing from newly synthesized material. Yeast cells segregate the spindle pole body (SPB, centrosome equivalent) inherited from the previous mitosis to the bud, while keeping the new one in the mother cell. Here, we show that the SPB inheritance network (SPIN), comprising the kinases Swe1 (also known as Wee1) and Kin3 (also known as Nek2) and the acetyltransferase NuA4 (also known as Tip60), distinguishes pre-existing from new SPBs...
August 2017: Nature Cell Biology
https://www.readbyqxmd.com/read/28710961/epigenetic-modification-differences-between-fetal-fibroblast-cells-and-mesenchymal-stem-cells-of-the-arbas-cashmere-goat
#17
Xiao Wang, Zhimin Wang, Qing Wang, Hefei Wang, Hao Liang, Dongjun Liu
To explore the epigenetic mechanisms regulating mesenchymal stem cells, we analyzed epigenetic patterns in control goat fetal fibroblast cells (gFFCs), adipose-derived stem cells (gADSCs), bone marrow stromal cells (gBMSCs), and muscle-derived satellite cells (gMDSCs). We found that the 5mC content of gBMSC genomes was lower than that of gFFC genomes, while the 5mC content of gADSC and gMDSC genomes surpassed that of gFFC genomes. H3K9 acetylation did not differ significantly among those cells; gFFCs, gADSCs, and gMDSCs contained acetylated H3K9, H3K14, H3K18, H4K5, and H4K12, but gBMSCs contained almost no acetylated H4K5 and H4K12...
July 9, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28710461/bromodomain-factors-of-bet-family-are-new-essential-actors-of-pericentric-heterochromatin-transcriptional-activation-in-response-to-heat-shock
#18
Edwige Col, Neda Hoghoughi, Solenne Dufour, Jessica Penin, Sivan Koskas, Virginie Faure, Maria Ouzounova, Hector Hernandez-Vargash, Nicolas Reynoird, Sylvain Daujat, Eric Folco, Marc Vigneron, Robert Schneider, André Verdel, Saadi Khochbin, Zdenko Herceg, Cécile Caron, Claire Vourc'h
The heat shock response is characterized by the transcriptional activation of both hsp genes and noncoding and repeated satellite III DNA sequences located at pericentric heterochromatin. Both events are under the control of Heat Shock Factor I (HSF1). Here we show that under heat shock, HSF1 recruits major cellular acetyltransferases, GCN5, TIP60 and p300 to pericentric heterochromatin leading to a targeted hyperacetylation of pericentric chromatin. Redistribution of histone acetylation toward pericentric region in turn directs the recruitment of Bromodomain and Extra-Terminal (BET) proteins BRD2, BRD3, BRD4, which are required for satellite III transcription by RNAP II...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28694333/epc1-tip60-mediated-histone-acetylation-facilitates-spermiogenesis-in-mice
#19
Yixin Dong, Kyo-Ichi Isono, Kazuyuki Ohbo, Takaho A Endo, Osamu Ohara, Mamiko Maekawa, Yoshiro Toyama, Chizuru Ito, Kiyotaka Toshimori, Kristian Helin, Narumi Ogonuki, Kimiko Inoue, Atsuo Ogura, Kazutsune Yamagata, Issay Kitabayashi, Haruhiko Koseki
Global histone hyperacetylation is suggested to play a critical role for replacement of histones by transition proteins and protamines to compact the genome during spermiogenesis. However, the underlying mechanisms for hyperacetylation-mediated histone replacement remains poorly understood. Here, we report that EPC1 and TIP60, two critical components of the mammalian nucleosome acetyltransferase of H4 (NuA4) complexes, are coexpressed in male germ cells. Strikingly, genetic ablation of either Epc1 or Tip60 disrupts hyperacetylation and impairs histone replacement, in turn causing aberrant spermatid development...
October 1, 2017: Molecular and Cellular Biology
https://www.readbyqxmd.com/read/28692054/modeling-cancer-driver-events-in-vitro-using-barrier-bypass-clonal-expansion-assays-and-massively-parallel-sequencing
#20
H Huskova, M Ardin, A Weninger, K Vargova, S Barrin, S Villar, M Olivier, T Stopka, Z Herceg, M Hollstein, J Zavadil, M Korenjak
The information on candidate cancer driver alterations available from public databases is often descriptive and of limited mechanistic insight, which poses difficulties for reliable distinction between true driver and passenger events. To address this challenge, we performed in-depth analysis of whole-exome sequencing data from cell lines generated by a barrier bypass-clonal expansion (BBCE) protocol. The employed strategy is based on carcinogen-driven immortalization of primary mouse embryonic fibroblasts and recapitulates early steps of cell transformation...
October 26, 2017: Oncogene
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