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维生素E对神经细胞氧化应激损伤的保护作用

, PP. 768-770

Keywords: 维生素E,α7nAchR,神经细胞

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Abstract:

目的探讨维生素E对FeSO4和H2O2诱导PC12细胞氧化应激损伤模型的保护作用及其可能的机制。方法采用FeSO4和H2O2作用产生自由基的方法诱导建立PC12细胞氧化应激损伤模型。MTT比色法测定细胞活性,硫代巴比妥酸法测定MDA含量,黄嘌呤氧化酶法测定SOD活力,免疫细胞化学法测定α7烟碱型乙酰胆碱受体(nAchR)阳性表达及dotblot法测定α7nAchR亚单位水平。结果与FeSO4和H2O2损伤组(0.136±0.015)进行比较,维生素E组(0.178±0.025)和EGCG组(0.181±0.029)均能明显提高PC12细胞的活细胞数量(P<0.01),提高SOD活力(15.29±0.79)U?mL-1对(17.37±0.76)U?mL-1、(17.90±0.44)U?mL-1,P<0.01,有效降低MDA的含量(4.51±0.20)mmol?L-1对(3.39±0.11)mmol?L-1、(3.20±0.15)mmol?L-1,P<0.01,明显上调α7nAChR的表达(0.0910±0.0272)对(0.1895±0.0392)、(0.1956±0.0322),P<0.01。结论维生素E对FeSO4和H2O2诱导建立PC12细胞氧化损伤模型具有明显的保护作用,其作用机制可能与维生素E清除自由基,抑制脂质过氧化过程和保护α7nAchR有关。

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