山楂叶总黄酮对缺氧人脐静脉内皮细胞细胞毒、NO和Ca^(2+)水平的调控作用(英文)

Regulative Effects of Hawthorn Leave Flavonoids on Cytotoxicity, NO and Ca^(2+) in Hypoxia-treated Human Umbilical Vein Endothelial Cells

目的为探讨山楂叶总黄酮(HLF,w/w,80%flavonoids)抗血栓的潜能,研究了山楂叶总黄酮对缺氧人脐静脉内皮细胞的调控作用。方法应用流式细胞技术,检测了内皮细胞细胞毒及胞内一氧化氮水平。此外,运用激光共焦点扫描显微技术,检测了细胞内钙离子水平。结果研究数据显示,5μg/ml和10μg/ml的山楂叶总黄酮可以降低缺氧人脐静脉内皮细胞的细胞毒水平(P<0.05,P<0.01)。缺氧内皮细胞内钙离子和一氧化氮的水平也能被5μg/ml(P<0.01,P<0.01)和10μg/ml(P<0.01,P<0.01)的山楂叶总黄酮显著下调。结论结果提示,山楂叶总黄酮对缺氧人脐静脉内皮细胞有保护作用,且下调细胞内钙离子和一氧化氮的水平可能是这种保护作用的机制之一。

Objective To evaluate the potential effect of HLF (Hawthorn leave flavonoids, w/w, 80% flavonoids) against thrombus formation, effect of HLF on hypoxia-treated human umbilical vein endothelial cell (HUVECs) was studied. Method The levels of cytotoxicity and NO upon HUVECs were studied by flow cytometry. Moreover, the level of calcium ion in HUVECs was examined through laser scanning confocal microscopy. Result Data from this study showed that HLF at concentrations of 5 μg/ml and 10μg/ml decreased the cytotoxicity of hypoxia to HUVECs (P<0.05, P<0.01). The intracellular levels of NO and calcium ion were downregulated by HLF at concentrations of 5μg/ml (P<0.01; P<0.01) and 10μg/ml (vs control, P<0.01; P<0.01) too. Conclusion Results observed suggest that HLF protect HUVECs from hypoxia partly through its regulative effect on NO and calcium ion levels.