Caveolin-1 regulates the secretion and cytoprotection of Cyr61 in hyperoxic cell death

Yang Jin, Hong Pyo Kim, Jiaofei Cao, Meng Zhang, Emeka Ifedigbo, Augustine M.K. Choi

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


Cysteine-rich 61 (cyr61) belongs to the ccn family and mediates cell roliferationsurvival, and apoptosis. Ourprevious studies showed that cyr61 protected against hyperoxia-induced lung cell death via akt phosphorylation. Caveolin-1 (cav-1), a 22-kda transmembrane scaffolding protein, is the principal structural component of caveolae.Emerging data show that cav-1 regulates signal transduction-associated proteins that reside in the caveolae.Numerous integrin-related pathways, including pi3k/akt-induced cell survival are controlled by cav-1-mediatedsignaling. Our data showed that recombinant cyr61 promoted cell proliferation and resistance to hyperoxia-inducedcell death in vitro. Neutralizing antibodies reversed the above effects, indicating functional role of secreted cyr61 inresponse to hyperoxic stress. While deletion of cav-1 protected cells from hyperoxia-induced cell death,cyr61-neutralizing antibodies abolished this protective effect. Furthermore, cyr61 and cav-1 colocalized and physically interacted via integrins in bronchial epithelial cells. Deletion of cav-1 increased extracellular and decreased cytosoliccyr61, both in vitro and in vivo. Pretreatment with brefeldin a increased intracellular cyr61 in cav-1 -/- cells, while decreasing extracellular cyr61. Taken together, cav-1/cyr61 interaction via integrins represents a novel pathwayof cyr61 signaling involving cav-1-dependent processes, which play a critical role in regulating hyperoxia-induced celldeath.

Original languageEnglish (US)
Pages (from-to)341-350
Number of pages10
JournalFASEB Journal
Issue number2
StatePublished - Feb 2009


  • CNN
  • Exocytosis
  • Signaling

ASJC Scopus subject areas

  • Biotechnology
  • Biochemistry
  • Molecular Biology
  • Genetics


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