p21(WAF1) gene promoter is epigenetically silenced by CTIP2 and SUV39H1.

p21(WAF1) gene promoter is epigenetically silenced by CTIP2 and SUV39H1.
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DOI:
10.1038/onc.2009.193
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发表时间:
2009-09-24
期刊:
影响因子:
8
通讯作者:
Rohr, O.
Rohr, O.
中科院分区:
医学1区
文献类型:
--
作者:
Cherrier, T.;Suzanne, S.;Redel, L.;Calao, M.;Marban, C.;Samah, B.;Mukerjee, R.;Schwartz, C.;Gras, G.;Sawaya, B. E.;Zeichner, S. L.;Aunis, D.;Van Lint, C.;Rohr, O.

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细胞周期蛋白依赖性激酶抑制剂CDKN1A/p21WAF1 (p21)主要在转录水平调控,是DNA损伤、衰老和肿瘤抑制反应的主要细胞周期调控因子。在这里,我们报道了p21基因启动子募集的coup - tf相互作用蛋白2 (CTIP2),通过与组蛋白去乙酰化酶和甲基转移酶的相互作用,沉默了p21基因的转录。重要的是,使用SUV39H1特异性抑制剂chaeomycin治疗可以抑制p21基因启动子处的组蛋白H3赖氨酸9三甲基化,刺激p21基因表达并诱导细胞周期阻滞。此外,CTIP2和SUV39H1被招募到沉默的p21基因启动子中,共同抑制p21基因的转录。p21WAF1基因诱导人类免疫缺陷病毒1 (HIV-1)感染有利于病毒在巨噬细胞中的表达。在这里,我们报道CTIP2进一步消除vpr介导的p21刺激,从而间接促成HIV-1潜伏期。综上所述,我们的研究结果表明,CTIP2是p21基因的组成抑制因子,它与SUV39H1和组蛋白甲基化合作,沉默p21基因的转录。
Mainly regulated at the transcriptional level, the cellular cyclin-dependent kinase inhibitor, CDKN1A/p21WAF1 (p21), is a major cell cycle regulator of the response to DNA damage, senescence and tumor suppression. Here, we report that COUP-TF-interacting protein 2 (CTIP2), recruited to the p21 gene promoter, silenced p21 gene transcription through interactions with histone deacetylases and methyltransferases. Importantly, treatment with the specific SUV39H1 inhibitor, chaetocin, repressed histone H3 lysine 9 trimethylation at the p21 gene promoter, stimulated p21 gene expression and induced cell cycle arrest. In addition, CTIP2 and SUV39H1 were recruited to the silenced p21 gene promoter to cooperatively inhibit p21 gene transcription. Induction of p21WAF1 gene upon human immunodeficiency virus 1 (HIV-1) infection benefits viral expression in macrophages. Here, we report that CTIP2 further abolishes Vpr-mediated stimulation of p21, thereby indirectly contributing to HIV-1 latency. Altogether, our results suggest that CTIP2 is a constitutive p21 gene suppressor that cooperates with SUV39H1 and histone methylation to silence the p21 gene transcription.
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