| First Author | Jin Y | Year | 2008 |
| Journal | Am J Respir Cell Mol Biol | Volume | 39 |
| Issue | 2 | Pages | 171-9 |
| PubMed ID | 18323531 | Mgi Jnum | J:151061 |
| Mgi Id | MGI:4352656 | Doi | 10.1165/rcmb.2007-0323OC |
| Citation | Jin Y, et al. (2008) Deletion of caveolin-1 protects against oxidative lung injury via up-regulation of heme oxygenase-1. Am J Respir Cell Mol Biol 39(2):171-9 |
| abstractText | Acute lung injury (ALI) is a major cause of morbidity and mortality in critically ill patients. Hyperoxia causes lung injury in animals and humans, and is an established model of ALI. Caveolin-1, a major constituent of caveolae, regulates numerous biological processes, including cell death and proliferation. Here we demonstrate that caveolin-1-null mice (cav-1(-/-)) were resistant to hyperoxia-induced death and lung injury. Cav-1(-/-) mice sustained reduced lung injury after hyperoxia as determined by protein levels in bronchoalveolar lavage fluid and histologic analysis. Furthermore, cav-1(-/-) fibroblasts and endothelial cells and cav-1 knockdown epithelial cells resisted hyperoxia-induced cell death in vitro. Basal and inducible expression of the stress protein heme oxygenase-1 (HO-1) were markedly elevated in lung tissue or fibroblasts from cav-1(-/-) mice. Hyperoxia induced the physical interaction between cav-1 and HO-1 in fibroblasts assessed by co-immunoprecipitation studies, which resulted in attenuation of HO activity. Inhibition of HO activity with tin protoporphyrin-IX abolished the survival benefits of cav-1(-/-) cells and cav-1(-/-) mice exposed to hyperoxia. The cav-1(-/-) mice displayed elevated phospho-p38 mitogen-activated protein kinase (MAPK) and p38beta expression in lung tissue/cells under basal conditions and during hyperoxia. Treatment with SB202190, an inhibitor of p38 MAPK, decreased hyperoxia-inducible HO-1 expression in wild-type and cav-1(-/-) fibroblasts. Taken together, our data demonstrated that cav-1 deletion protects against hyperoxia-induced lung injury, involving in part the modulation of the HO-1-cav-1 interaction, and the enhanced induction of HO-1 through a p38 MAPK-mediated pathway. These studies identify caveolin-1 as a novel component involved in hyperoxia-induced lung injury. |
