Objective To investigate the effects of extract of Ginkgo biloba leaves EGb761 on 1-methy-l 4-phenylpyridium (MPP+)-induced injury in human neuroblastoma SH-SY5Y cells; To discuss its mechanism of action.Methods Cell culture method was used and SH-SY5Y cell damage model was induced with different concentrations of MPP+ to build Parkinson’s disease model in vitro. The experiment was divided into control group, MPP+ model group, low-, medium-, and high-dose EGb761 groups. The survival rate was determined by MTT assay, and the apoptotic rate was detected by flow cytometry according to AnnexinV apoptosis detection kit. The cell morphology was observed by inverted microscope. NO content in SH-SY5Y cells was detected by Nitric acid reduction method.Results Compared with the control group, the survival rate of SH-SY5Y cells decreased and the apoptotic rate and NO content increased in the model group (P<0.05); Compared with the model group, the survival rate of SH-SY5Y cells increased and the apoptotic rate and NO content decreased in the low-, medium- and high-dose EGb761 groups (P<0.05).Conclusion EGb761 can protect MPP+-induced SH-SY5Y cell from damage by the inhibition of the content of NO free radical.%目的：观察银杏叶提取物EGb761对人脑神经瘤母细胞SH-SY5Y细胞损伤的影响，探讨其作用机制。方法采用细胞培养方法，建立SH-SY5Y细胞1-甲基-4-苯基吡啶离子（MPP+）损伤帕金森病体外模型。实验分为对照组、模型组和中药低、中、高剂量组，各给药组给予相应剂量药物。MTT 法测定细胞存活率， AnnexinV 凋亡检测试剂盒和流式细胞仪测定细胞凋亡率；倒置显微镜观察细胞形态；硝酸还原法检测SH-SY5Y细胞一氧化氮（NO）的含量。结果与对照组比较，模型组SH-SY5Y细胞存活率降低、细胞凋亡率增加和NO含量升高（P＜0.05）；与模型组比较，中药中、高剂量组SH-SY5Y细胞存活率增加、细胞凋亡率降低，NO含量降低（P＜0.05）。结论银杏叶提取物EGb761可以通过抑制细胞内NO自由基的含量对MPP+诱导的SH-SY5Y细胞损伤起到保护作用。
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