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Expression of caspase-3 during H2O2-induced apoptosis in rat lens epithelial cells

王凯军, 姚克, 徐雯, 吴仁毅, 戴南平

Abstract

目的探讨半胱氨酸天冬氨酸酶(caspase 3)在氧化损伤致大鼠晶状体上皮细胞凋亡过程中的表达及意义.方法离体大鼠晶状体于MEM培养液中培养,实验组加入终浓度为2 mmol/L的过氧化氢(H2O2),对照组不加H2O2,观察培养过程中两组晶状体混浊程度;透射电镜下观察晶状体上皮细胞超微结构改变;免疫组织化学方法测定细胞中caspase 3表达.结果在H2O2作用下随培养时间延长,晶状体混浊度加重,伴随晶状体上皮细胞凋亡增加;caspase 3表达量随细胞凋亡及晶状体混浊度的增加而增加.结论晶状体上皮细胞凋亡是氧化损伤诱发白内障模型的细胞学基础;caspase 3可能参与晶状体上皮细胞凋亡和白内障的形成,在白内障的发病机制中占有重要地位.

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Key concepts: Apoptosis, Lens (geology), Cell biology, Caspase, Caspase 3, Caspase 8, Biology, Chemistry