甘草甜素对体外诱导的酒精性脂肪肝细胞的影响及机制研究

摘要

目的 探讨甘草甜素对体外诱导的酒精性脂肪肝(AFL)肝细胞模型的影响及其可能的作用机制.方法 将体外诱导的AFL肝细胞分为对照组、脱离乙醇组、甘草甜素组和继续诱导组,检测细胞内三酰甘油(TG)水平,丙氨酸转氨酶(ALT)和天冬氨酸转氨酶(AST)的泄漏量、细胞周期变化,以及核受体超家族转录因子γ(PPARγ)、含有“碱性螺旋-环-螺旋-亮氨酸拉链”结构的核转录因子1 (SREBP-1)、固醇调节元件结合蛋白裂解激活蛋白(SCAP)的mRNA与蛋白表达.结果 甘草甜素可以明显减少细胞凋亡的发生;与对照组相比,甘草甜素组细胞内TG水平及ALT、AST的泄漏量、PPAR-γ、SREBP-1和SCAP蛋白及mR-NA表达均明显降低(P＜0.05).结论 甘草甜素可能通过下调PPAR-γ、SREBP-1、SCAP的表达从而减轻体外诱导AFL肝细胞脂肪改变.%Objective To investigate the effects of glycyrrhizin on the cell model of alcoholic fatty liver(AFL) induced in vitro and its possible mechanism.Methods The in vitro induced AFL cells were divided into the control group,separating ethanol group,glycyrrhizin group and continuous induction group.The levels of intracellular triglyceride(TG) and leakage amounts of ALT and AST,cell cycle change and protein and mRNA expressions of PPAR-γ,SREBP-1 and SCAP were measured.Results Glycyrrhizin could obviously reduce the apoptosis occurrence;compared with the control group,the level of intracellular TG and the leakage amounts of ALT and AST,and the protein and mRNA expressions of PPAR-γ,SREBP-1 and SCAP were significantly decreased(P＜0.05).Conclusion Glycyrrhizin may alleviate the fat change of in vitro induced AFL cells by down-regulating expressions of PPAR-γ,SREBP-1 and SCAP.