海星皂苷对非酒精性脂肪肝大鼠肌肉胰岛素信号通路的影响

摘要

Aim To investigate the effects of starfish saponins(Sfs) on insulin signaling pathway in orotic acid-induced NAFLD rats.Methods 1% orotic acid was used to establish NAFLD model in male Wistar rats for six weeks.The NAFLD rats were randomly divided into two groups(eight rats in each group) and then fed with the corresponding diets: Model group(1% orotic acid)and Sfs group(1% orotic acid containing 0.04% starfish saponins).After starfish saponins feeding for 8 weeks, hepatic lipids content, liver function indices and relevant protein expression in muscle insulin signaling pathway were measured.Results Compared with model group, starfish saponins reduced hepatic lipids content and improved liver functions.In addition, it effectively ameliorated insulin resistance by improving insulin signaling pathway and improved glucose uptake in muscle.Conclusion The amelioration effect of starfish saponins on impaired insulin signaling pathway in muscle is observed in orotic acid-induced NAFLD rats.%目的 研究海星皂苷对乳清酸诱导的非酒精性脂肪肝大鼠肌肉胰岛素信号通路的影响.方法 ♂ Wistar大鼠连续6周喂食1%乳清酸建立NAFLD(nonalcoholic fatty liver disease,NAFLD)模型.将NAFLD模型大鼠随机分为模型组(model group,Model)和海星皂苷组(starfish saponins group,Sfs),分别喂食1%乳清酸饲料和添加含0.04%海星皂苷的1%乳清酸饲料.海星皂苷干预8周后,分别测定大鼠肝脏脂质水平、肝功指标以及肌肉胰岛素信号通路相关蛋白表达量.结果 海星皂苷明显降低肝脏脂质水平、改善肝功,并通过增强IRS-1/PI3K/Akt胰岛素信号通路和上调GLUT4的表达来改善肌肉组织的胰岛素抵抗,提高肌肉对葡萄糖的摄取.结论 海星皂苷能促进肌肉组织胰岛素信号通路的传递,从而改善乳清酸诱导NAFLD大鼠肌肉中胰岛素信号传递受阻现象.