The histone variant MacroH2A regulates Ca(2+) influx through TRPC3 and TRPC6 channels.

The histone variant MacroH2A regulates Ca(2+) influx through TRPC3 and TRPC6 channels.
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DOI:
10.1038/oncsis.2013.40
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发表时间:
2013-10-28
期刊:
影响因子:
6.2
通讯作者:
An, W.
An, W.
中科院分区:
医学1区
文献类型:
--
作者:
Kim, J-M;Heo, K.;Choi, J.;An, W.

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组蛋白变体macroH 2A在染色质的指定区域中取代典型的H2 A,其中其掺入具有建立功能上不同的染色质结构域的潜力。瞬时受体电位经典(TRPC)通道是一类控制胞浆Ca 2+浓度变化的Ca 2+可渗透阳离子通道。Trpc基因表达的适当调节需要染色质重塑,但对这些调节过程的性质知之甚少。在这里,我们发现macroH 2A 1抑制两个Trpc家族基因,Trpc 3和Trpc 6,并减弱膀胱癌细胞中的钙依赖性增殖反应。MacroH 2A 1招募组蛋白去乙酰化酶1(HDAC 1)和HDAC 2,以促进其持续作用,导致Trpc 3和Trpc 6基因座上组蛋白乙酰化的妥协。此外,macroH 2A 1耗竭增强组蛋白乙酰化和Ca 2+内流,导致细胞生长和侵袭增加。我们的数据提供了新的见解TRPC 3/TRPC 6介导的Ca 2+信号,并表明macroH 2A 1在调节Trpc 3和Trpc 6基因的转录能力的核心作用。
The histone variant macroH2A replaces canonical H2A in the designated region of chromatin where its incorporation has the potential to establish a functionally distinct chromatin domain. The transient receptor potential canonical (TRPC) channels are a family of Ca2+-permeable cationic channels controlling changes in the cytosolic Ca2+ concentration. The proper regulation of Trpc gene expression requires chromatin remodeling, but little is known about the nature of these regulatory processes. Here, we show that macroH2A1 represses two Trpc family genes, Trpc3 and Trpc6, and attenuates Ca2+-dependent proliferative responses in bladder cancer cells. MacroH2A1 recruits histone deacetylase 1 (HDAC1) and HDAC2 to facilitate its persistent action, resulting in a compromise of histone acetylation across the Trpc3 and Trpc6 loci. Further, macroH2A1 depletion augments histone acetylation and Ca2+ influx, leading to increased cell growth and invasion. Our data provide new insights into TRPC3/TRPC6-mediated Ca2+ signaling and indicate a central role for macroH2A1 in regulating transcriptional competence of Trpc3 and Trpc6 genes.
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