期刊
AMERICAN JOURNAL OF PATHOLOGY
卷 158, 期 4, 页码 1411-1422出版社
AMER SOC INVESTIGATIVE PATHOLOGY, INC
DOI: 10.1016/S0002-9440(10)64092-8
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- Wellcome Trust Funding Source: Medline
Prostaglandin E(2) (PGE(2)) inhibits fibroblast proliferation and collagen production. Its synthesis by fibroblasts is induced by profibrotic mediators including transforming growth factor (TGF)-beta (1). However, in patients with pulmonary fibrosis, PGE(2) levels are decreased. In this study we examined the effect of TGF-beta (1) on PGE(2) synthesis, proliferation, collagen production, and cyclooxygenase (COX) mRNA levels in fibroblasts derived from fibrotic and nonfibrotic human lung. In addition, we examined the effect of bleomycin-induced pulmonary fibrosis in COX-2-deficient mice. We demonstrate that basal and TGF-beta (1)-induced PGE(2) synthesis is limited in fibroblasts from fibrotic lung. Functionally, this correlates with a loss of the anti-proliferative response to TGF-beta (1). This failure to induce PGE(2) synthesis Is because of an inability to up-regulate COX-2 mRNA levels in these fibroblasts, Furthermore, mice deficient in COX-2 exhibit an enhanced response to bleomycin, We conclude that a decreased capacity to up-regulate COX-2 expression and COX-2-derived PGE(2) synthesis in the presence of increasing levels of profibrotic mediators such as TGF-beta (1) may lead to unopposed fibroblast proliferation and collagen synthesis and contribute to the pathogenesis of pulmonary fibrosis.
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