Abrogation of TGF-beta 1-induced fibroblast-myofibroblast differentiation by histone deacetylase inhibition

作者：Guo Weichao; Shan Bin; Kling**erg Ross C; Qin Xiangmei; Lasky Joseph A^*

来源：American Journal of Physiology - Lung Cellular and Molecular Physiology, 2009, 297(5): L864-L870.

DOI：10.1152/ajplung.00128.2009

• Akt
• protein phosphatase
• idiopathic pulmonary fibrosis
• myosin light chain 2

Guo W, Shan B, Klingsberg RC, Qin X, Lasky JA. Abrogation of TGF-beta 1-induced fibroblast-myofibroblast differentiation by histone deacetylase inhibition. Am J Physiol Lung Cell Mol Physiol 297: L864-L870, 2009. First published August 21, 2009; doi: 10.1152/ajplung.00128.2009.-Idiopathic pulmonary fibrosis (IPF) is a devastating disease with no known effective pharmacological therapy. The fibroblastic foci of IPF contain activated myofibroblasts that are the major synthesizers of type I collagen. Transforming growth factor (TGF)-beta 1 promotes differentiation of fibroblasts into myofibroblasts in vitro and in vivo. In the current study, we investigated the molecular link between TGF-beta 1-mediated myofibroblast differentiation and histone deacetylase (HDAC) activity. Treatment of normal human lung fibroblasts (NHLFs) with the pan-HDAC inhibitor trichostatin A (TSA) inhibited TGF-beta 1-mediated alpha-smooth muscle actin (alpha-SMA) and alpha(1) type I collagen mRNA induction. TSA also blocked the TGF-beta 1-driven contractile response in NHLFs. The inhibition of alpha-SMA expression by TSA was associated with reduced phosphorylation of Akt, and a pharmacological inhibitor of Akt blocked TGF-beta 1-mediated alpha-SMA induction in a dose-dependent manner. HDAC4 knockdown was effective in inhibiting TGF-beta 1-stimulated alpha-SMA expression as well as the phosphorylation of Akt. Moreover, the inhibitors of protein phosphatase 2A and 1 (PP2A and PP1) rescued the TGF-beta 1-mediated alpha-SMA induction from the inhibitory effect of TSA. Together, these data demonstrate that the differentiation of NHLFs to myofibroblasts is HDAC4 dependent and requires phosphorylation of Akt.

• 出版日期2009-11