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青钱柳三萜酸对高糖所致的胰岛α细胞胰岛素抵抗的影响

Effect of triterpenic acid-enriched fraction from Cyclocarya paliurus on high glucose-induced pancreatic α cells insulin resistance

  • 摘要: 为探究青钱柳三萜酸(TAE)对胰岛素抵抗胰岛α细胞胰高血糖素分泌的影响及其可能的干预机制,采用长期高糖诱导小鼠胰高糖素瘤细胞株(αTC1-6)建立胰岛α细胞胰岛素抵抗细胞模型。实验分组为:正常对照组(5.5 mmol/L葡萄糖),模型组(25 mmol/L葡萄糖),青钱柳三萜酸组(TAE,1、5、10 μg/mL),TAE+PI3K抑制剂渥曼青霉素组(10 μg/mL TAE+10 nmol/L wortmannin)。给药后收集上清液,裂解细胞。采用ELISA试剂盒检测αTC1-6细胞上清液的胰高血糖素含量,qPCR和Western blot检测细胞裂解液中的胰岛素受体-1(IRS-1)、磷脂酰肌醇3激酶(PI3K)及其胰岛素信号通路中下游蛋白激B(Akt)的mRNA和蛋白表达水平。结果显示,TAE可以浓度依赖性降低高糖诱导的αTC1-6细胞的胰高血糖素分泌量,并可增加胞内IRS-1、PI3K和Akt的基因表达和磷酸化水平,而给予渥曼青霉素后能够逆转其作用。研究表明,TAE对高糖所致的胰岛α细胞胰岛素抵抗具有一定的改善作用,并可能与激活IRS/PI3K/Akt信号通路有关。

     

    Abstract: To investigate the effect and possible mechanisms of triterpenic acid-enriched fraction from Cyclocarya paliurus(TAE)on glucagon secretion in insulin-resistance pancreatic α cells, the model of insulin resistance in αTC1-6 cells was induced by long term exposure to high glucose. Experimental groups were divided as follow: control(5. 5 mmol/L glucose), model(25 mmol/L), TAE(1, 5, 10 μg/mL), and TAE(10 μg/mL)plus wortmannin(10 nmol/L)group. The supernatant and lysate of treated cells were collected to determine glucagon secretion by ELISA kit. The mRNA and protein abundance of IRS-1, PI3K and Akt were measured by qPCR and Western blot analysis. Results showed that TAE could not only significantly reduce glucagon secretion induce by high glucose in a dose-dependent manner, but also remarkably increased the mRNA and protein abundance of IRS-1, PI3K and Akt in αTC1-6 cells. However, these effects of TAE were reversed by PI3K inhibitor wortmannin. In conclusion, it suggested that TAE could improve the insulin resistance induced by high glucose in pancreatic α cells which may be related with the activation of IRS-1/PI3K/Akt signaling pathway.

     

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