Innate immune sensing of cytosolic chromatin fragments through cGAS promotes senescence.

Innate immune sensing of cytosolic chromatin fragments through cGAS promotes senescence.
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DOI:
10.1038/ncb3586
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发表时间:
2017-09
影响因子:
21.3
通讯作者:
Ablasser A
Ablasser A
中科院分区:
生物学1区
文献类型:
--
作者:
Glück S;Guey B;Gulen MF;Wolter K;Kang TW;Schmacke NA;Bridgeman A;Rehwinkel J;Zender L;Ablasser A

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细胞衰老是由各种不同的压力引发的,其特征在于细胞周期的永久停滞。衰老细胞分泌多种炎症因子,统称为衰老相关分泌表型(SASP)。SASP的监管机制仍然不完全清楚。在这里,我们定义了先天DNA传感在衰老和SASP调节中的作用。我们发现,环GMP-AMP合酶(cGAS)识别衰老细胞中的胞质染色质片段(CCF)。cGAS的激活反过来又通过干扰素基因刺激因子(STING)触发SASP因子的产生,从而促进旁分泌衰老。我们证明了细胞衰老的不同刺激参与cGAS-STING途径在体外,我们显示cGAS依赖性调节衰老照射和致癌基因激活在体内。我们的研究结果通过建立cGAS-STING途径作为衰老和SASP的关键调节因子,为细胞衰老的机制提供了见解。
Cellular senescence is triggered by various distinct stresses and characterized by a permanent cell cycle arrest. Senescent cells secrete a variety of inflammatory factors, collectively referred to as the senescence-associated secretory phenotype (SASP). The mechanism(s) underlying the regulation of the SASP remains incompletely understood. Here we define a role for innate DNA sensing in the regulation of senescence and the SASP. We find that cyclic GMP-AMP synthase (cGAS) recognizes cytosolic chromatin fragments (CCFs) in senescent cells. The activation of cGAS, in turn triggers the production of SASP factors via Stimulator of interferon genes (STING), thereby promoting paracrine senescence. We demonstrate that diverse stimuli of cellular senescence engage the cGAS-STING pathway in vitro and we show cGAS-dependent regulation of senescence upon irradiation and oncogene activation in vivo. Our findings provide insights into the mechanisms underlying cellular senescence by establishing the cGAS-STING pathway as a crucial regulator of senescence and the SASP.
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