摘要目的:研究姜黄素对STZ诱导糖尿病大鼠骨骼肌胰岛素抵抗的影响及其机制。方法:雄性SD大鼠腹腔注射STZ诱导糖尿病大鼠模型。成模大鼠分为糖尿病组(DM)，糖尿病＋姜黄素组(DM＋Cur)，糖尿病＋缓冲液对照组(DM＋NC)。以正常SD大鼠为正常对照组(NC)。DM＋Cur组予姜黄素灌胃治疗，DM＋NC组给予等体积缓冲液灌胃。连续给药12周。12周后检测血糖变化，高胰岛素-正葡萄糖钳夹试验检测外周胰岛素抵抗。实验结束处死大鼠，取骨骼肌提取总蛋白及细胞膜蛋白，Western blot法检测骨骼肌磷酸化PI3K及AKT和总PI3K及AKT水平，检测骨骼肌总GLUT4及细胞膜上GLUT4水平，免疫荧光检测骨骼肌细胞膜上GLUT4水平。多组间的比较采用单因素方差分析，评估PI3K、AKT磷酸化程度及GLUT4向细胞膜转位的变化。结果:姜黄素治疗组血糖水平低于糖尿病组[(18.67±1.99对24.38±2.88) mmol/L， P<0.05]，胰岛素抵抗较糖尿病组减轻[平均GIR(14.69±0.29对10.25±0.30) mg·kg -1·min -1, P<0.01]，胰岛素信号通路中p-PI3K、p-AKT水平升高，GLUT4向细胞膜转位增多。 结论:姜黄素通过激活PI3K/AKT通路，促进GLUT4向细胞膜转位，增加骨骼肌葡萄糖摄取，最终改善胰岛素抵抗。

abstractsObjective:To investigate the effects and mechanisms of curcumin on insulin resistance in streptozocin-induced diabetic rats.Methods:Diabetic rats were induced by intraperitoneal injection of STZ, then all the rats were randomly divided into diabetes (DM), diabetes+ curcumin (DM+ Cur), and diabetes + buffer control (DM+ NC) groups. Normal SD rats were used as control group (NC). The DM+ Cur group was treated with curcumin, while the DM+ NC group was treated with equal-volume buffer. The test lasted 12 weeks. The blood glucose was detected, and hyperinsulinemic-euglycemic clamp test was performed to estimate peripheral insulin resistance. At the end of the experiments, rats were killed and the total protein and cell membrane protein were extracted from skeletal muscle. The levels of phosphorylated PI3K, phosphorylated AKT, total PI3K, and total AKT were measured by Western blot. The levels of total GLUT4 and GLUT4 of cell membrane were also detected by Western blot, GLUT4 levels in skeletal muscle cell membranes were detected by immunofluorescence.Results:Blood glucose levels of DM+ Cur group were lower than those of DM group [(18.67±1.99 vs 24.38±2.88) mmol/L, P<0.05], and insulin resistance was also improved[the average GIR(14.69±0.29 vs 10.25±0.30) mg·kg -1·min -1, P<0.01]. The phosphorylation levels of PI3K and AKT were increased, and GLUT4 translocation to the cell membrane was increased. Conclusion:By activating the PI3K/AKT pathway, curcumin promotes GLUT4 translocation, increases skeletal muscle glucose uptake, and finally improves insulin resistance.