IL-22经Wnt/β-catenin通路抑制肝星状细胞致纤维化作用

摘要

目的:研究IL-22抑制HSC致肝纤维化的作用和机制,探索Wnt/β-catenin通路在肝星状细胞(HSC)激活过程中的作用.方法:采用TGF-β1激活HSC,荧光定量PCR和Western blot检测细胞激活过程中β-catenin、α-SMA的mRNA和蛋白表达变化情况.应用不同浓度和不同时间的重组大鼠IL-22刺激大鼠HSC,CCK8法检测细胞增殖率,流式细胞术检测细胞凋亡率.采用TGF-β1预处理HSC,再用最适浓度IL-22干预,对比干预前后HSC增殖情况,并检测β-catenin、α-SMA的mRNA和蛋白表达变化情况.结果:TGF-β1激活HSC后,β-catenin、α-SMA的mRNA和蛋白表达水平显著升高(P<0.05).IL-22以浓度依赖性和时间依赖性抑制HSC增殖(P<0.05),并降低β-catenin、α-SMA的mRNA和蛋白表达水平(P<0.05),但对HSC凋亡率无显著影响(P>0.05).IL-22可以显著抑制TGF-β1诱导的HSC激活,并显著降低β-catenin、α-SMA的mRNA和蛋白表达水平(P<0.05).结论:Wnt/β-catenin参与了HSC激活和分泌α-SMA过程, IL-22以浓度依赖性和时间依赖性抑制HSC活性,这种作用可能是通过抑制Wnt/β-catenin通路实现的.%Objective:To investigate the effects and mechanisms of interleukin-22(IL-22) on inhibiting liver fibrosis induced by HSC,and explore the role of Wnt/β-catenin pathway in the activation of hepatic stellate cells(HSC).Methods:Rat HSC was activated by TGF-β1,and the mRNA and protein levels of β-catenin and α-SMA were detected by q-PCR and Western blot,respectively.HSC was treated with different hours and concentration of recombinant rat protein IL-22.The cell proliferation rates were detected by CCK8,cell apoptosis rates were tested by flow cytometry.HSC were treated with optimal concentration of IL-22 after activated by TGF-β1,the cell proliferation rates,mRNA and protein levels of β-catenin and α-SMA were compared of before and after intervention.Results:The mRNA and the protein levels of β-catenin and α-SMA were significantly increased after activated by TGF-β1(P<0.05).IL-22 inhibiting the proliferation of HSC in a dose-and time-dependent manner (P<0.05) and decreased the mRNA and the protein expression level of β-catenin and α-SMA(P<0.05),but had no significant effect on apoptosis rates(P>0.05).IL-22 significantly inhibited the activation of HSC induced by TGF-β1 and remarkably decreased the mRNA and the protein expression level of β-catenin and α-SMA(P<0.05).Conclusion:The Wnt/β-catenin pathway may participates in the process of HSC activation and α-SMA secretion,and IL-22 inhibits biological function of HSC in a dose-and time-dependent manner.This effect probably via inhibited the Wnt/β-catenin signal pathway.