共查询到20条相似文献,搜索用时 15 毫秒
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Trichostatin A extends the lifespan of Drosophila melanogaster by elevating hsp22 expression 总被引:2,自引:1,他引:1
Tao D Lu J Sun H Zhao YM Yuan ZG Li XX Huang BQ 《Acta biochimica et biophysica Sinica》2004,36(9):618-622
Aging can be defined as time-dependent, gradual anddetrimental changes in the structure and physiologicalfunction of an organism, ultimately leading to death [1].Factors influencing the aging process would change thelongevity. In Drosophila melanogaster, … 相似文献
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Illumination is necessary and sufficient to induce histone acetylation independent of transcriptional activity at the C4-specific phosphoenolpyruvate carboxylase promoter in maize
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Offermann S Danker T Dreymüller D Kalamajka R Töpsch S Weyand K Peterhänsel C 《Plant physiology》2006,141(3):1078-1088
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Fan X Roy EM Murphy TC Nanes MS Kim S Pike JW Rubin J 《Journal of cellular biochemistry》2004,93(4):807-818
Receptor activator of NFkappa-B ligand (RANKL) is essential for osteoclast formation, function, and survival. Although RANKL mRNA and protein levels are modulated by 1,25(OH)2D3 and other osteoactive factors, regulatory mechanisms remain unclear. In this study, we show that 2 kb or 2 kb plus exon 1 of a RANKL promoter sequence conferred neither 1,25(OH)2D3 response nor tissue specificity. The histone deacetylase inhibitors trichostatin A (TSA) and sodium butyrate (SB), however, strongly increased RANKL promoter activity. A series of 5'-deleted RANKL promoter constructs from 2,020 to 110 bp showed fourfold increased activity after TSA treatment. TSA also dose dependently enhanced endogenous RANKL mRNA expression with 50 microM of TSA treatment causing equivalent RANKL expression to that seen with 1 nM 1,25(OH)2D3. Using a chromatin immunoprecipitation (ChIP) assay we showed that TSA significantly enhanced association of both acetylated histone H3 and H4 on the RANKL promoter, with H4 > H3. A similar increase in acetylated histone H4 on the RANKL gene locus was seen after 1,25(OH)2D3 treatment, but ChIP assay did not reveal localization of VDR/RXR heterodimers on the putative VDRE of the RANKL promoter. To explore the role of H4 acetylation of 1,25(OH)2D3 stimulated RANKL, we added both TSA and 1,25(OH)2D3 together. While the combination further increased acetylation of H4 on the RANKL locus, surprisingly, TSA inhibited 1,25(OH)2D3-induced RANKL mRNA expression by 70% at all doses of 1 ,25(OH)2D3 studied. These results suggest that TSA increases of endogenous expression of RANKL involve enhanced acetylation of histones on the proximal RANKL promoter. Preventing deacetylation, however, blocks 1,25(OH)2D3 action on this gene. Chromatin remodeling is therefore involved in RANKL expression. 相似文献
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Localized H3K36 methylation states define histone H4K16 acetylation during transcriptional elongation in Drosophila 总被引:1,自引:0,他引:1
Bell O Wirbelauer C Hild M Scharf AN Schwaiger M MacAlpine DM Zilbermann F van Leeuwen F Bell SP Imhof A Garza D Peters AH Schübeler D 《The EMBO journal》2007,26(24):4974-4984
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