自噬抑制剂3-甲基腺嘌呤在H2O2引起的神经胶质瘤U251细胞损伤中的作用

目的: 探讨自噬抑制剂3-甲基腺嘌呤(3-MA)在H₂O₂诱导的神经胶质瘤U251细胞损伤过程中的作用。方法: 实验分为4组:正常对照组、10 mmol/L 3-MA组、1 mmol/L H₂O₂组、1 mmol/L H₂O₂ +10 mmol/L 3-MA组。MTT法检测各组的U251细胞增殖率;MDC染色检测细胞自噬空泡的变化;Hoechst 33342染色检测细胞核染色质凝聚变化;流式细胞术检测细胞凋亡率。结果: 与对照组相比,单独应用3-MA对U251细胞无明显影响。H₂O₂作用组U251细胞增殖率明显降低,细胞内出现自噬空泡,细胞核染色质凝聚,细胞凋亡率增加。3-MA与H₂O₂联合作用于U251细胞时,与单独应用H₂O₂组相比,抑制了H₂O₂引起的胞内自噬空泡的积聚,但细胞凋亡率明显增加。结论: 自噬抑制剂3-MA能够一定程度地抑制H₂O₂诱导的U251细胞自噬,但促进了细胞凋亡,表明自噬在H₂O₂诱导的神经胶质瘤U251细胞损伤过程中很可能起到保护性作用。

Role of autophagy inhibitor 3-methyladenine in the injury of U251 cells induced by H2O2

AIM:To investigate the role of autophagy inhibitor 3-methyladenine(3-MA)in the injury of U251 glioma cells induced by H_2O_2.METHODS:The following groups in this study were set up:control group,10 mmol/L 3-MA group,1 mmol/L H_2O_2 group and 1 mmol/L H_2O_2+10 mmol/L 3-MA group.The viability of U251 cells in each group was detected by MTT assay.Autophagic vacuoles in the cells were observed by staining with MDC.The cells were stained with Hoechst 33342 to determine the chromatin condensation.Cell apoptotic r...