IMR Press / FBL / Volume 17 / Issue 7 / DOI: 10.2741/4077

Frontiers in Bioscience-Landmark (FBL) is published by IMR Press from Volume 26 Issue 5 (2021). Previous articles were published by another publisher on a subscription basis, and they are hosted by IMR Press on as a courtesy and upon agreement with Frontiers in Bioscience.

Open Access Article
TGF-beta 1 induced fibroblast proliferation is mediated by the FGF-2/ERK pathway
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1 Department of Emergency, Shengjing Hospital of China Medical University, Shenyang, China
2 Institute of Respiratory Disease, The First Affiliated Hospital of China Medical University, Shenyang, China
Front. Biosci. (Landmark Ed) 2012, 17(7), 2667–2674;
Published: 1 June 2012

Pulmonary fibrosis, defined as the accumulation of connective tissue in the lungs, is a severe and often fatal form of interstitial lung disease. Transforming growth factor-beta (TGF-beta) is a powerful activator of connective tissue synthesis and fibroblast proliferation in the lung, and a critical paracrine signal for the development of pulmonary fibrosis. To investigate signaling pathways downstream of TGF- beta that contribute to lung fibrosis, TGF- beta stimulation of fibroblasts was replicated by treating NIH3T3 fibroblasts with conditioned medium (CM) from TGF- beta -treated type II alveolar epithelial cells (ATII cells). The data showed that fibroblast growth factor 2 (FGF-2) signaling is responsible for TGF-beta 1 CM-induced fibroblast proliferation, while it does not affect TGF-beta 1 CM-induced fibrotic differentiation. Moreover, fibroblast proliferation and differentiation induced by TGF- beta CM was totally abrogated by pretreatment of NIH3T3 cells with the specific ERK1/2 inhibitor, PD98059. These findings indicate that FGF-2 secreted by alveolar epithelial cells in response to TGF- beta 1 induces fibroblast proliferation and fibrotic activation through the ERK kinase pathway.

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