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榼藤子总皂苷抗糖尿病作用机制的初步研究

Keywords: 榼藤子总皂苷,2型糖尿病,胰腺,磷脂酰肌醇3激酶途径

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Abstract:

目的:探讨榼藤子总皂苷对2型糖尿病大鼠胰岛形态及骨骼肌PI3K通路相关蛋白表达的影响。方法:通过高脂饲料喂养结合注射小剂量链脲佐菌素(STZ)建立2型糖尿病大鼠模型。实验大鼠随机分为正常对照组、模型组、阳性对照组(二甲双胍,200mg·kg-1)、榼藤子总皂苷低、高(25,50mg·kg-1)剂量组。治疗3周后对各组大鼠胰腺HE染色病理切片胰岛形态、数目等进行观察比较,采用Westernblot方法检测各组大鼠骨骼肌组织中胰岛素受体底物-1(IRS-1)、磷脂酰肌醇3激酶(PI3K)、蛋白酪氨酸磷酸酶-1B(PTP-1B)和葡萄糖转运子4(GLUT4)等蛋白的表达水平。结果:同模型组相比,榼藤子总皂苷各给药组胰腺组织病理切片均结构相对正常、胰泡细胞清晰可见、被膜结构完整,胰岛数目均接近于对照组;同时上述各给药组大鼠骨骼肌组织中IRS-1,PI3K和GLUT4蛋白表达水平均较模型组有所上调,PTP-1B蛋白表达水平均较模型组有所下调。结论:榼藤子总皂苷对2型糖尿病大鼠胰腺组织具有保护作用,并对骨骼肌组织中蛋白的异常表达具有干预作用。

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