糖化终末产物对MIN6细胞活力及活性氧（ROS）水平的影响

Effects of advanced glycation end products on cell viability and level of reactive oxygen species （ ROS ） in MIN6 cells

探讨糖化终末产物（AGE）对小鼠胰岛细胞株MIN6细胞活力及活性氧（ROS）水平的影响。制备BSA—AGE，用不同浓度AGE（100、200、400mg／L）干预MIN6细胞不同时间后，MTT比色法检测细胞活力变化。以活性氧捕获剂双氢一乙酰乙酸二氯荧光黄（DCFH—DA）孵育细胞，通过流式细胞仪检测细胞内二氯荧光黄（DCF）的荧光强度而测得细胞内活性氧水平，并测定胰岛素分泌的变化。随着AGE浓度的升高和作用时间的延长，细胞活力明显下降（P〈0．05）。经DCFH．DA孵育后流式细胞仪检测显示，AGE处理组细胞内DCF平均荧光强度较对照组明显升高（P〈0．05）。胰岛素分泌量随着AGE浓度的增高和时间的延长，呈下降趋势（P〉0．05）。提示BSA-AGE抑制MIN6活力，使细胞内活性氧生成增加，诱导MIN6细胞氧化应激。

[ Summary ] To explore the effect of advanced glycation end-products （AGEs） on cell viability and level of reactive oxygen species（ROS） in MIN6 ceils. After intervention of various concentrations（ 100,200 ,and 400 mg/L） of AGEs for some time, cell viability was detected by MTF assay. 2＇, 7＇-dichlorofluorescein diacetate （DCFH-DA） was used as a reactive oxygen species capture agent. The fluorescent intensity of 2＇, 7 ＇-dichlorofluorescein （ DCF）, which was the product of cellular oxidation of DCFH-DA, was detected by flow cytometry. The level of ROS and insulin secretion was thus measured. Viability of MIN6 cells was inhibited by AGEs in a dose and time dependent manner（ P〈 0. 05 ）. Intracellular fluorescent intensity of DCF was markedly elevated in the AGEs groups as compared with that in the control group（ P〈0. 05 ）. Insulin secretion was decreased in the AGEs groups than that in the control group （P〉 0. 05 ）. The results suggest that AGEs inhibit the viability and induce oxidative stress in MIN6 ceils by overproduction of ROS.