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

Meng Zhang, Seon Jin Lee, Changhyeok An, Jin Fu Xu, Bharat Joshi, Ivan R. Nabi, Augustine M.K. Choi, Yang Jin

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)1252-1262
Number of pages11
JournalFree Radical Biology and Medicine
Volume50
Issue number10
DOIs
StatePublished - May 15 2011

Keywords

  • Apoptosis
  • Caveolin-1
  • Fas
  • Free radicals
  • Hyperoxia

ASJC Scopus subject areas

  • Biochemistry
  • Physiology (medical)

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