SENP1 Is a Crucial Regulator for Cell Senescence through DeSUMOylation of Bmi1.

SENP1 Is a Crucial Regulator for Cell Senescence through DeSUMOylation of Bmi1.
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SENP1 是通过 Bmi1 去SUMOylation 调节细胞衰老的重要调节因子

DOI:
10.1038/srep34099
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发表时间:
2016-09-23
期刊:
影响因子:
4.6
通讯作者:
Zuo Y
Zuo Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Xia N;Cai J;Wang F;Dong B;Liu S;Chen F;Cheng J;Zuo Y

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细胞衰老可以限制增殖潜力并防止肿瘤发生。Bmi 1是通过抑制Ink 4a/Arf位点而在细胞衰老中起关键调节作用。然而,如何在细胞衰老中调节Bmi 1活性在很大程度上是未知的。在此,我们发现SENP 1通过调节Bmi 1 SUMO化在细胞衰老中起重要作用。Senp 1 −/−原代MEF细胞对传代或其他衰老诱导信号诱导的细胞衰老具有抵抗性。SENP 1缺陷还减少癌基因H-RasV 12诱导的衰老,并增强H-RasV 12诱导的细胞转化。我们进一步表明,在Senp 1 −/−MEFs中,p53/p21介导的细胞衰老中的重要调节因子p19 Arf的表达显著降低。同时,我们证明SENP 1可以特异性地去SUMO化Bmi 1,从而减少Bmi 1在p19 Arf启动子上的占据,导致H2 AK 119单泛素化减少和p19 Arf的表达上调。这些数据揭示了SENP 1在细胞衰老和细胞转化的调节中的关键作用。
Cell senescence can limit proliferative potential and prevent tumorigenesis. Bmi1 is a key regulator in cell senescence by suppressing the Ink4a/Arf locus. However, how to regulate Bmi1 activity in cell senescence is largely unknown. Here, we show that SENP1 plays an important role in cell senescence by regulating Bmi1 SUMOylation.Senp1−/−primary MEF cells show resistance to cell senescence induced by passaging or other senescence inducing signals. SENP1 deficiency also reduces oncogene H-RasV12-induced senescence, and enhances H-RasV12-induced cell transformation. We further show that inSenp1−/−MEFs the expression of p19Arf, an important regulator in p53/p21-mediated cell senescence, is markedly reduced. Meanwhile, we demonstrate that SENP1 can specifically de-SUMOylate Bmi1 and thereby decreases the occupancy of Bmi1 on p19Arfpromoter leading to decrease of H2AK119 mono-ubiquitination and up-expression of p19Arf. These data reveal a crucial role of SENP1 in regulation of cell senescence as well as cell transformation.
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