蒲黄总黄酮对3T3-L1脂肪细胞糖脂代谢的影响

Effects of Pollen Typhae total flavone on glucose and lipid metabolism in 3T3-L1 adipocytes

目的：探讨蒲黄总黄酮对脂肪细胞糖脂代谢的影响。方法：药物处理胰岛素抵抗3T3-L1脂肪细胞24h，通过检测培养液中的葡萄糖含量反映葡萄糖消耗量；XTT法观察药物对细胞活性的影响；^3H-葡萄糖摄入法观察细胞对葡萄糖的转运率；通过检测上清液中的浓度观察细胞游离脂肪酸（freefatty acid，FFA）的溢出。结果：蒲黄总黄酮在浓度为0．025-0．4g／L时有增加葡萄糖消耗的作用，且呈剂量效应。当浓度为0．4g／L时，XTT值明显下降，显示对细胞的毒性作用。在0．2g／L时，蒲黄总黄酮与罗格列酮相似，可明显提高细胞对^3H-脱氧葡萄糖的转运率。蒲黄总黄酮组培养上清液中FFA浓度明显低于空白对照组，而罗格列酮组则无明显差异。结论：蒲黄总黄酮能显著增加3T3-L1脂肪细胞的葡萄糖摄取和消耗，同时可减少FFA溢出，通过调节糖代谢和脂代谢改善胰岛素抵抗。

Objective： To observe the effects of Pollen Typhae total flavone （PTF） on glucose and lipid metabolism in 3T3-L1 adipocytes, Methods： The content of glucose which disappeared from the culture medium after incubation with drugs for 24 hours was determined as glucose consumption of the cells, The activity of cells was detected by XTT method. The transport of glucose was observed by ^3H-glucose uptake method. The efflux of free fatty acid （FFA） from adipocytes was observed by the concentration of FFA in the culture medium. Results： The glucose concentration in culture medium was significantly decreased with a concentration-dependent effect, when PTF concentrations were from 0. 025 g/L to 0.4 g/L. The toxic effect on cells appeared while PTF concentration was 0.4 g/L, and the MTT value decreased. PTF also significantly increased glucose transportation in the 3T3-L1 adipocytes as rosiglitazone （ROS） did. At the same time, FFA concentration in culture medium was significantly decreased as compared to the normal control group, while ROS-treated group did not show any difference. Conclusion： PTF can increase insulin sensitivity by increasing glucose transportation and consumption in the 3T3-L1 adipocytes as well as decreasing the FFA efflux from the cells.