Caveolin-1 mediates Fas-BID signaling in hyperoxia-induced apoptosis.

Caveolin-1 mediates Fas-BID signaling in hyperoxia-induced apoptosis.
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DOI:
10.1016/j.freeradbiomed.2011.02.031
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发表时间:
2011-05-15
影响因子:
7.4
通讯作者:
Jin, Yang
Jin, Yang
中科院分区:
医学1区
文献类型:
--
作者:
Zhang, Meng;Lee, Seon-Jin;An, ChangHyeok;Xu, Jin-fu;Joshi, Bharat;Nabi, Ivan R.;Choi, Augustine M. K.;Jin, Yang

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Fas 介导的细胞凋亡是至关重要的细胞事件。 Fas、Fas 相关死亡结构域和 caspase 8 形成死亡诱导信号复合物 (DISC)。激活的 caspase 8 介导外源途径并裂解胞质 BID。截短的 BID (tBID) 易位至线粒体,促进细胞色素 c 的释放,并激活内在途径。然而,导致这些 DISC 成分聚集并形成复合物的机制仍不清楚。我们发现 Cav-1 调节 Fas 信号传导并介导外在和内在途径之间的通讯。高氧后不久(4小时),Cav-1和Fas的共定位和相互作用增加,随后Fas多聚体和DISC形成。 Cav-1 (Cav-1−/−) 的缺失破坏了 DISC 的形成。此外,Cav-1 与 BID 相互作用。 Cav-1 Y14 酪氨酸突变为苯丙氨酸 (Y14F),破坏了高氧诱导的 BID 和 Cav-1 之间的相互作用,随后导致 tBID 水平降低和对高氧诱导的细胞凋亡的抵抗。活性氧 (ROS) 清除剂 N-乙酰半胱氨酸减少了 Cav-1-Fas 相互作用。使用 siRNA 删除谷胱甘肽过氧化物酶 2 会加剧 BID-Cav-1 相互作用和 tBID 形成。综上所述,这些结果表明,Cav-1 通过与 Fas 和 BID 相互作用来调节高氧/ROS 诱导的细胞凋亡,可能分别通过 Fas 棕榈酰化和 Cav-1 Y14 磷酸化。
Fas-mediated apoptosis is a crucial cellular event. Fas, the Fas-associated death domain, and caspase 8 form the death-inducing signaling complex (DISC). Activated caspase 8 mediates the extrinsic pathways and cleaves cytosolic BID. Truncated BID (tBID) translocates to the mitochondria, facilitates the release of cytochrome c, and activates the intrinsic pathways. However, the mechanism causing these DISC components to aggregate and form the complex remains unclear. We found that Cav-1 regulated Fas signaling and mediated the communication between extrinsic and intrinsic pathways. Shortly after hyperoxia (4 h), the colocalization and interaction of Cav-1 and Fas increased, followed by Fas multimer and DISC formation. Deletion of Cav-1 (Cav-1−/−) disrupted DISC formation. Further, Cav-1 interacted with BID. Mutation of Cav-1 Y14 tyrosine to phenylalanine (Y14F) disrupted the hyperoxia-induced interaction between BID and Cav-1 and subsequently yielded a decreased level of tBID and resistance to hyperoxia-induced apoptosis. The reactive oxygen species (ROS) scavenger N-acetylcysteine decreased the Cav-1–Fas interaction. Deletion of glutathione peroxidase-2 using siRNA aggravated the BID–Cav-1 interaction and tBID formation. Taken together, these results indicate that Cav-1 regulates hyperoxia/ROS-induced apoptosis through interactions with Fas and BID, probably via Fas palmitoylation and Cav-1 Y14 phosphorylation, respectively.
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