Ligustrazine Attenuates Liver Fibrosis by Targeting miR-145 Mediated Transforming Growth Factor-β/Smad Signaling in an Animal Model of Biliary Atresia

Abstract

To investigate therapeutic target for ligustrazine during liver fibrosis in an ethanol-induced biliary atresia rat model and transforming growth factor-b (TGF-b) induced hepatic stellate cell activation cell model, and the underlying mechanism, a total of 30 rats were randomly assigned into five groups (n 5 6 per group): control, sham, ethanol-induced biliary atresia model, model plus pirfenidone, and model plus ligustrazine groups. The liver changes were assessed using H&E and Masson staining and transmission electron microscopy. Expression of miR-145 and mRNA and protein levels of TGF-b/smads pathway-related proteins were detected. HSC-T6 cells were infected with LV-miR or rLV-miR-145 in the presence or absence of SMAD3 inhibitor SIS3 and treated with 2.5 ng/ml TGF-b1 and then with ligustrazine. Collected cells were subjected to detect the expression of miR-145 and mRNA and protein expression levels of TGF-b/smads pathwayrelated proteins. Ligustrazine rescued liver fibrogenesis and pathology for ethanol-caused bile duct injury, revealed by decreased a-smooth muscle actin and collagen I expression and liver tissue and cell morphology integrity. Further experiments showed that ligustrazine inhibited intrinsic and phosphorylated Smad2/3 protein expression and modification. Similar results were obtained in cells.In addition, ligustrazine altered miR-145 expression in both animal and cell models. Lentivirus mediated miR-145 overexpression and knockdown recombinant virus showed that miR-145 enhanced the TGF-b/Smad pathway, which led to hepatic stellate cell activation, and ligustrazine blocked this activation. This work validated that ligustrazine-regulated miR-145 mediated TGF-b/Smad signaling to inhibit the progression of liver fibrosis in a biliary atresia rat model and provided a new therapeutic strategy for liver fibrosis. SIGNIFICANCE STATEMENTWith an ethanol-induced biliary atresia rat model, ligustrazine was found to rescue liver fibrogenesis and pathology for ethanol caused bile duct injury, revealed by decreased a-smooth muscle actin and collagen I expression and liver tissue and cell morphology integrity. Furthermore, we found ligustrazine upregulated miR-145 expression and inhibited TGF-b/SMAD signaling pathway both in vivo and in vitro. In addition, overexpression and knockdown of miR-145 confirmed that miR-145 is involved in the ligustrazine inhibition of liver fibrosis through the TGF-b/SMAD signaling pathway.

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