Caveolin-1 deficiency protects from pulmonary fibrosis by modulating epithelial cell senescence in mice.

American Journal of Respiratory Cell and Molecular Biology
Pooja ShivshankarClaude Jourdan Le Saux

Abstract

Idiopathic pulmonary fibrosis is associated with a decreased expression of caveolin-1 (cav-1), yet its role remains unclear. To investigate the role of cav-1, we induced pulmonary fibrosis in wild-type (WT) and cav-1-deficient (cav-1(-/-)) mice using intratracheal instillation of bleomycin. Contrary to expectations, significantly less collagen deposition was measured in tissue from cav-1(-/-) mice than in their WT counterparts, consistent with reduced mRNA expression of procollagen1a2 and procollagen3a1. Moreover, cav-1(-/-) mice demonstrated 77% less α-smooth muscle actin staining, suggesting reduced mesenchymal cell activation. Levels of pulmonary injury, assessed by tenascin-C mRNA expression and CD44v10 detection, were significantly increased at Day 21 after injury in WT mice, an effect significantly attenuated in cav-1(-/-) mice. The apparent protective effect against bleomycin-induced fibrosis in cav-1(-/-) mice was attributed to reduce cellular senescence and apoptosis in cav-1(-/-) epithelial cells during the early phase of lung injury. Reduced matrix metalloproteinase (MMP)-2 and MMP-9 expressions indicated a low profile of senescence-associated secretory phenotype (SASP) in the bleomycin-injured cav-1(-/-) mice. Howev...Continue Reading

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