摘要将3T3-L1前脂肪细胞诱导分化为成熟的脂肪细胞,用软脂酸制备脂肪细胞胰岛素抵抗模型,不同浓度的脂联素球状结构域(globular domain of adiponectin,gAd)干预已经产生胰岛素抵抗的3T3-L1脂肪细胞,葡萄糖氧化酶法检测培养液中葡萄糖的消耗量,实时荧光定量PCR法检测胰岛素受体底物(IRS)-1、磷脂酰肌醇3激酶(PI3K)、蛋白激酶B(PKB)基因水平的变化,Western印迹检测IRS-1酪氨酸磷酸化水平.结果显示,与对照组相比,各实验组葡萄糖消耗量均显著增加(P＜0.01),且随着gAd浓度的增加,葡萄糖消耗量也逐渐增加；500 ng/ml gAd组及1 000 ng/ml gAd组IRS-1、PI3K、PKB的mRNA表达均比对照组显著增加(P＜0.05)；同时,gAd可增加3T3-L1脂肪细胞胰岛素抵抗模型IRS-1酪氨酸磷酸化水平,且呈浓度依赖性.提示gAd能够促进3T3-L1脂肪细胞胰岛素抵抗模型葡萄糖的摄取,其机制可能与促进脂肪细胞胰岛素信号转导、改善胰岛素抵抗有关.

abstractsInsulin resistance model of 3T3-L1 adipocytes were prepared with plamotic acid.Adipocytes with generated insulin resistance were cultured with different concentrations of globular domain of adiponectin(gAd:250,500,1 000 ng/ml).The cell culture medium glucose content was detected with the glucose oxidase method,the mRNA expressions of insulin receptor substrate-1 (IRS-1),phosphatidylinositol-3 kinase(PI3K),and protein kinase B(PKB) were detected with real-time quantitative PCR method.The phosphorylation of IRS-1 was detected by Western blot.Compared with the control group,the experimental group showed significantly increased glucose consumption (P ＜ 0.01),and with the increasing gAd concentration,glucose consumption was gradually increasing.IRS-1 phosphorylation was increased gradually with the increasing concentration of gAd.These results suggest that gAd can promote glucose uptake by 3T3-L1 adipocyte model with generated insulin resistance.This may be correlated with promoting insulin signal transduction and improving insulin resistance in adipocytes.