同型半胱氨酸对培养内皮细胞损伤的研究

目的:本研究拟探讨同型半胱氨酸对培养人脐静脉内皮细胞的损伤效应,以揭示同型半胱氨酸致动脉粥样硬化的可能机制。方法:将人脐静脉内皮细胞暴露于不同浓度的同型半胱氨酸24h后,观察细胞形态并测定细胞的乳酸脱氢酶释放率、总蛋白含量、凋亡及脂质过氧化的程度。结果:(1)同型半胱氨酸不仅可诱导细胞凋亡而且在较高浓度时可致细胞坏死;(2)同型半胱氨酸有较强的促脂质过氧化的效应,并呈量效关系;(3)同型半胱氨酸的上述效应因加入LDL而增强,示同型半胱氨酸与LDL有协同作用。结论:同型半胱氨酸可能是通过氧化应激机制导致内皮细胞出现坏死,凋亡等损伤的改变。

Studies on injury ofendothelial cells by homocysteine

AIM: This study is to detail its possible mechanisms that homocysteine (Hcy) induces injury of cultured endothelial cells.METHODS: Hcy in sequential concentrations was added into the cultured human umbilial vein endothelial cells for 24 hours in serum-free medium. The lipid peroxidation, release of LDH, cell total protein content, cell apoptosis and necrosis were assessed. RESULTS: Hcy increased the apoptosis of endothelial cells.In high Hcy concentration the cells also showed obvious injurious and necrotic morphological changes. Lipid peroxidation increased, with LDH releasing up and cell total protein content down, and they showed a positive dose-effect relationship with the Hcy concentration. All the above effects of Hcy was strengthened by low density lipoprotein (LDL) which may suggest synergetic effects of Hcy and LDL.CONCLUSION: Our results indicate that Hcy has a strong oxidizing effect, which may be one of its major mechanism for injury of EC.