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miR-193a/b-3p relieves hepatic fibrosis and restrains proliferation and activation of hepatic stellate cells.

J Cell Mol Med. 2019 Jun;23(6):3824-3832. doi:10.1111/jcmm.14210. Epub 2019 Apr 03
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摘要


MicroRNAs (miRNAs) have been confirmed to participate in liver fibrosis progression and activation of hepatic stellate cells (HSCs). In this study, the role of miR-193a/b-3p in concanavalin A (ConA)-induced liver fibrosis in mice was evaluated. According to the results, the expression of miR-193a/b-3p was down-regulated in liver tissues after exposure to ConA. Lentivirus-mediated overexpression of miR-193a/b-3p reduced ConA-induced liver injury as demonstrated by decreasing ALT and AST levels. Moreover, ConA-induced liver fibrosis was restrained by the up-regulation of miR-193a/b-3 through inhibiting collagen deposition, decreasing desmin and proliferating cell nuclear antigen (PCNA) expression and lessening the content of hydroxyproline, transforming growth factor-β1 (TGF-β1) and activin A in liver tissues. Furthermore, miR-193a/b-3p mimics suppressed the proliferation of human HSCs LX-2 via inducing the apoptosis of LX-2 cells and lowering the levels of cell cycle-related proteins Cyclin D1, Cyclin E1, p-Rb and CAPRIN1. Finally, TGF-β1 and activin A-mediated activation of LX-2 cells was reversed by miR-193a/b-3p mimics via repressing COL1A1 and α-SMA expression, and restraining the activation of TGF-β/Smad2/3 signalling pathway. CAPRIN1 and TGF-β2 were demonstrated to be the direct target genes of miR-193a/b-3p. We conclude that miR-193a/b-3p overexpression attenuates liver fibrosis through suppressing the proliferation and activation of HSCs. Our data suggest that miR-193a-3p and miR-193b-3p may be new therapeutic targets for liver fibrosis.

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