• J. Cell. Biochem. · Sep 2018

    A novel molecular mechanism of microRNA-21 inducing pulmonary fibrosis and human pulmonary fibroblast extracellular matrix through transforming growth factor β1-mediated SMADs activation.

    • Jun Zhou, Qianqian Xu, Qiudi Zhang, Zhigang Wang, and Shuhong Guan.
    • Department of Respiratory Medicine, The Third Affiliated Hospital of Soochow University/The First People's Hospital of Changzhou, Changzhou, China.
    • J. Cell. Biochem. 2018 Sep 1; 119 (9): 7834-7843.

    AbstractPulmonary fibrosis (PF), characterized by the destruction of lung tissue architecture and the abnormal deposition of extracellular matrix (ECM) proteins, currently has no satisfactory treatment. The role of microRNA (miR)-21 in PF has been reported; the current study attempted to investigate a novel molecular mechanism by which miR-21 exerted its function. Consistent with previous studies, miR-21 inhibition reduced ECM protein levels in bleomycin (BLM)-induced mouse model of PF. In human pulmonary fibroblast (IMR-90), miR-21 inhibition reduced transforming growth factor β1 (TGFβ1)-induced ECM protein expression. Regarding a novel molecular mechanism, TGFβ1 combined with TGFβ1 receptor 1 (TGFβ1RI) to activate SMAD2/3, promote SMAD4 nucleus transformation, and thus regulate miR-21 expression and ECM. SMAD3 and SMADs complex could bind to the promoter region of miR-21 to promote miR-21 expression. In conclusion, miR-21 exerts promotive effects on BLM-induced PF and TGFβ1-induced ECM in IMR-90; TGFβ1 combines with TGFβ1RI to activate SMAD2/3, promote SMAD4 nucleus transformation, promote miR-21 expression, and thus to promote BLM-induced PF and TGFβ1-induced ECM in IMR-90 cells.© 2018 Wiley Periodicals, Inc.

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