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- W2105410069 abstract "Idiopathic pulmonary fibrosis (IPF) is a progressive and lethal lung disease characterized by the expansion of the fibroblast/myofibroblast population and aberrant remodeling. However, the origin of mesenchymal cells in this disorder is still under debate. Recent evidence indicates that epithelial-mesenchymal transition (EMT) induced primarily by TGF-beta1 plays an important role; however, studies regarding the opposite process, mesenchymal-epithelial transition, are scanty. We have previously shown that fibroblast growth factor-1 (FGF-1) inhibits several profibrogenic effects of TGF-beta1. In this study, we examined the effects of FGF-1 on TGF-beta1-induced EMT. A549 and RLE-6TN (human and rat) alveolar epithelial-like cell lines were stimulated with TGF-beta1 for 72 h, and then, in the presence of TGF-beta1, were cultured with FGF-1 plus heparin for an additional 48 h. After TGF-beta1 treatment, epithelial cells acquired a spindle-like mesenchymal phenotype with a substantial reduction of E-cadherin and cytokeratins and concurrent induction of alpha-smooth muscle actin measured by real-time PCR, Western blotting, and immunocytochemistry. FGF-1 plus heparin reversed these morphological changes and returned the epithelial and mesenchymal markers to control levels. Signaling pathways analyzed by selective pharmacological inhibitors showed that TGF-beta1 induces EMT through Smad pathway, while reversion by FGF-1 occurs through MAPK/ERK kinase pathway, resulting in ERK-1 phosphorylation and Smad2 dephosphorylation. These findings indicate that TGF-beta1-induced EMT is reversed by FGF-1 and suggest therapeutic approaches to target this process in IPF." @default.
- W2105410069 created "2016-06-24" @default.
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- W2105410069 date "2010-08-01" @default.
- W2105410069 modified "2023-10-16" @default.
- W2105410069 title "FGF-1 reverts epithelial-mesenchymal transition induced by TGF-β1 through MAPK/ERK kinase pathway" @default.
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- W2105410069 doi "https://doi.org/10.1152/ajplung.00070.2010" @default.
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