期刊
AMERICAN JOURNAL OF RESPIRATORY CELL AND MOLECULAR BIOLOGY
卷 40, 期 6, 页码 643-653出版社
AMER THORACIC SOC
DOI: 10.1165/rcmb.2008-0217OC
关键词
EMT; HGF; Smad7
资金
- National Institutes of Health [RO1 HL69810, P50 HL 70807, P50 84932, TG HL007563, EY08098]
- NATIONAL EYE INSTITUTE [P30EY008098] Funding Source: NIH RePORTER
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [P01HL070807, T32HL007563, R01HL069810] Funding Source: NIH RePORTER
Idiopathic pulmonary fibrosis is a lethal parenchymal lung disease characterized by denudation of the lung epithelium, fibroblast proliferation, and Collagen deposition. Cellular changes underlying disease progression involve injury to alveolar epithelial cells, epithelial to mesenchymal transition, proliferation of alpha-smooth muscle actin (alpha-SMA)-expressing myofibroblasts and of fibroblasts resulting in enhanced deposition of extracellular matrix proteins. Hepatocyte growth factor (HGF) inhibits progression of bleomycin-induced pulmonary fibrosis in mice. The mechanism underlying the inhibitory effect of HGF was investigated in an in vitro model. We show that HCF markedly antagonizes basal and transforming growth factor (TGF)-beta-induced expression of myofibroblast markers such as alpha-SMA, Collagen type 1, and fibronectin in rat alveolar epithelial cells. HCF also inhibited TGF-beta-induced alpha-SMA expression in primary murine alveolar epithelial cells. Since TGF-beta is known to regulate alpha-SMA expression, the effect of HCF on components of TGF-beta signaling was investigated. HGF induced expression of Smad7, an inhibitor of TGF-beta signaling, in a mitogen-activated protein kinase-dependent manner. HCF also induced the nuclear export of Smad7 and Smad ubiquitin regulatory factor 1 (Smurf1) to the cytoplasm. HGF-dependent decrease in alpha-SMA was abolished with specific siRNAs targeted to Smad7. Thus, induction of Smad7 by HGF serves to limit acquisition of the myofibroblast phenotype in alveolar epithelial cells.
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