蜕皮甾酮对胰岛素抵抗细胞模型胰岛素敏感性和糖代谢的影响

目的应用高胰岛素体外诱导培养建立的胰岛素抵抗HepG2细胞模型探讨蜕皮甾酮对其胰岛素敏感性和糖代谢的影响。方法采用3H-D-葡萄糖的参入试验评价细胞的胰岛素敏感性,在诱导胰岛素抵抗HepG2细胞模型的过程中或模型建立后,培养液中加入蜕皮甾酮及吡格列酮共同孵育,观察蜕皮甾酮及吡格列酮对HepG2细胞葡萄糖参入率,同时观察蜕皮甾酮对胰岛素抵抗细胞模型葡萄糖消耗量的影响。结果含有蜕皮甾酮(浓度为1×10-6~10-4mol·L-1)的胰岛素抵抗HepG2细胞的葡萄糖参入率与葡萄糖消耗量明显高于不含蜕皮甾酮的胰岛素抵抗HepG2细胞(对照细胞,P<0·01)。蜕皮甾酮与吡格列酮对胰岛素抵抗模型细胞的葡萄糖参入率与葡萄糖消耗量差异无显著性(P>0·05)。结论蜕皮甾酮在胰岛素抵抗细胞模型中能提高胰岛素介导的葡萄糖摄取和利用能力,即增加胰岛素的敏感性;并能明显改善糖代谢。

Effects of ecdysterone on insulin sensitivity and glucose metabolism in insulin-resistant cell model

Aim To investigate the effects of ecdysterone on insulin sensitivity and glucose metabolism in the insulin resistant HepG2 cell model induced by high concentration of insulin. Methods The insulin-stimulated glucose incorporation rate was determined with ~3H-D-glucose uptake test which was used to estimate insulin sensitivity of HepG2 cell, and glucose consumption, the amounts of glucose disappeared from the culture medium of HepG2 cells within 24 h were determined. Results The incubation of insulin resistance cells with ecdysterone 1×10~ -6 ～10~ -4 mol·L~ -1 could significantly increase the glucose uptake and glucose consumption of the cells compared with that of control cells(P<0.01). The glucose uptake and glucose consumption of insulin resistance cells were not of the difference in the insulin resistance cells with ecdysterone and pioglitazone(P>0.05). Conclusion Ecdysterone could improve the insulin sensitivity in the cell model and can attenuate the aggression of insulin resistance. The effect to improve the insulin sensitivity with ecdysterone is similar to that with pioglitazone.