Cigarette smoke-induced autophagy is regulated by SIRT1-PARP-1-dependent mechanism: implication in pathogenesis of COPD.

Cigarette smoke-induced autophagy is regulated by SIRT1-PARP-1-dependent mechanism: implication in pathogenesis of COPD.
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DOI:
10.1016/j.abb.2010.05.013
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发表时间:
2010-08-15
影响因子:
3.9
通讯作者:
Rahman, Irfan
Rahman, Irfan
中科院分区:
生物学3区
文献类型:
--
作者:
Hwang, Jae-woong;Chung, Sangwoon;Sundar, Isaac K.;Yao, Hongwei;Arunachalam, Gnanapragasam;McBurney, Michael W.;Rahman, Irfan

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自噬是一种基本的细胞过程,通过溶酶体降解途径消除长寿命蛋白质和受损细胞器。香烟烟雾(CS)介导的氧化应激会诱导肺细胞的细胞毒性反应。然而,自噬在 CS 介导的细胞毒反应中的作用及其机制尚不清楚。我们假设 NAD+ 依赖性脱乙酰酶 Sirtuin 1 (SIRT1) 在调节 CS 响应的自噬中发挥重要作用。 CS暴露导致肺上皮细胞、成纤维细胞和巨噬细胞自噬的诱导。用 SIRT1 激活剂白藜芦醇预处理细胞可减弱 CS 诱导的自噬,而 SIRT1 抑制剂 Sirtinol 可增强 CS 诱导的自噬。 CS 在 SIRT1 缺陷小鼠的肺部诱导自噬水平升高。抑制聚(ADP-核糖)-聚合酶-1 (PARP-1) 可通过 SIRT1 激活减弱 CS 诱导的自噬。这些数据表明SIRT1-PARP-1轴在CS诱导的自噬调节中发挥着关键作用,对于理解CS诱导的细胞死亡和衰老的机制具有重要意义。
Autophagy is a fundamental cellular process that eliminates long-lived proteins and damaged organelles through lysosomal degradation pathway. Cigarette smoke (CS)-mediated oxidative stress induces cytotoxic responses in lung cells. However, the role of autophagy and its mechanism in CS-mediated cytotoxic responses is not known. We hypothesized that NAD+-dependent deacetylase, sirtuin 1 (SIRT1) plays an important role in regulating autophagy in response to CS. CS exposure resulted in induction of autophagy in lung epithelial cells, fibroblasts and macrophages. Pretreatment of cells with SIRT1 activator resveratrol attenuated CS-induced autophagy whereas the SIRT1 inhibitor, sirtinol, augmented CS-induced autophagy. Elevated levels of autophagy were induced by CS in the lungs of SIRT1 deficient mice. Inhibition of poly(ADP-ribose)-polymerase-1 (PARP-1) attenuated CS-induced autophagy via SIRT1 activation. These data suggest that the SIRT1-PARP-1 axis plays a critical role in the regulation of CS-induced autophagy and have important implications in understanding the mechanisms of CS-induced cell death and senescence.
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