目的: 探讨天麻乙酸乙酯提取物对氧化损伤神经细胞的保护作用,并初步探讨其保护机制。 方法: 以过氧化氢(50~100 μmolL-1)预孵PC12细胞2 h造成的细胞氧化应激损伤模型,通过观察细胞形态,测定细胞存活率(MTT法)、乳酸脱氢酶(LDH)泄漏率、细胞内活性氧(ROS)水平和总超氧化物歧化酶(T-SOD)活性探讨了天麻乙酸乙酯提取物对PC12细胞氧化损伤的保护作用。 结果: 天麻乙酸乙酯提取物(20 mgL-1)能明显改善H2O2氧化损伤PC12模型细胞的形态,提高细胞存活率14.7%(P〈0.01);天麻乙酸乙酯提取物(20,40,80 mgL-1)降低模型细胞LDH泄漏率分别为22.0%,29.3%,20.2%(P〈0.01),明显提高细胞内T-SOD的活性(P〈0.01);天麻乙酸乙酯提取物(80 mgL-1)还降低细胞内ROS水平(P〈0.01)。 结论: 天麻乙酸乙酯提取物在体外具有抗氧化损伤的作用。
Objective: To investigate the effects and possible mechanisms of EtOAc extract from Gastrodia elata on oxidative damage of induced by H2O2 in PC12 cells. Method: PC12 cells were cultured and exposed to H2O2(50-100 μmol L-1)for 2 h to establish oxidative damage model. The protective effect of EtOAc extract was observed by morphological identification,colorimetric MTT assay,leakage rate of lactic dehydrogense(LDH),intracellular reactive oxygen species(ROS) level and total superoxide dismutase(T-SOD) activity. Result: Compared with the model group,EtOAc extract from G. elata at 20 mg L-1 could improve the cell morphology significantly,increase the survival rate of 14.7% (P〈0.01);EtOAc extract at 20,40,80 mg L-1 decrease the LDH release of 22.0%,29.3%,20.2% (P〈0.01) from cells into culture medium,raise intracellular T-SOD acivity (P〈0.01);EtOAc extract at 80 mg L-1 decrease the ROS level (P〈0.01). Conclusion: EtOAc extract from G. elata has a obvious antioxidant effect in vitro.