Cellular senescence mediated by p16INK4A-coupled miRNA pathways.

Cellular senescence mediated by p16INK4A-coupled miRNA pathways.
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DOI:
10.1093/nar/gkt1096
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发表时间:
2014-02
影响因子:
14.9
通讯作者:
Bishop CL
Bishop CL
中科院分区:
生物学2区
文献类型:
--
作者:
Overhoff MG;Garbe JC;Koh J;Stampfer MR;Beach DH;Bishop CL

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p16 是细胞衰老的关键调节因子,但这种增殖停滞稳定状态的驱动因素尚不清楚。在这里,我们在正常人乳腺上皮细胞中鉴定出了 22 种与衰老相关的 microRNA (SA-miRNA)。我们发现 SA-miRNA-26b、181a、210 和 424 协同作用,直接抑制 Polycomb 族 (PcG) 蛋白 CBX7、胚胎外胚层发育 (EED)、zeste 同源物 2 增强子 (EZH2) 和 zeste 12 同源物抑制子 (Suz12) 的表达,从而激活 p16。我们证明了存在一个紧密的正反馈循环,其中 SA-miRNA 激活并强化其他 SA-miRNA 成员的表达。相比之下,PcG 成员通过表观遗传抑制这些 SA-miRNA 的表达来抑制衰老。重要的是,p16 的缺失会导致 SA-miRNA 表达的抑制,从而将该衰老效应子与 SA-miRNA/PcG 自我调节环紧密耦合。总而言之,我们的研究结果阐明了支撑从增殖到细胞衰老转变的重要调控轴。
p16 is a key regulator of cellular senescence, yet the drivers of this stable state of proliferative arrest are not well understood. Here, we identify 22 senescence-associated microRNAs (SA-miRNAs) in normal human mammary epithelial cells. We show that SA-miRNAs-26b, 181a, 210 and 424 function in concert to directly repress expression of Polycomb group (PcG) proteins CBX7, embryonic ectoderm development (EED), enhancer of zeste homologue 2 (EZH2) and suppressor of zeste 12 homologue (Suz12), thereby activating p16. We demonstrate the existence of a tight positive feedback loop in which SA-miRNAs activate and re-enforce the expression of other SA-miRNA members. In contrast, PcG members restrain senescence by epigenetically repressing the expression of these SA-miRNAs. Importantly, loss of p16 leads to repression of SA-miRNA expression, intimately coupling this effector of senescence to the SA-miRNA/PcG self-regulatory loop. Taken together, our findings illuminate an important regulatory axis that underpins the transition from proliferation to cellular senescence.
循环miR34a作为用于脑衰老的无创,无创的生物标志物。
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