卡托普利对LPS致血管内皮细胞活化及损伤的拮抗作用

目的:探讨血管紧张素转换酶抑制剂对脂多糖(LPS)诱导的人脐静脉内皮细胞(HUVEC)活化及损伤的拮抗作用及可能机制。方法:建立体外人脐静脉内皮细胞培养。细胞生长至融合状态后分别加入LPS(1mg/L)及不同浓度的卡托普利(Cap)(10^-7mol/L、10^-5mol/L及10^-3mol/L)孵育18h。ELISA方法检测培养上清中血管假性血友病因子(vWF)含量,流式细胞仪间接免疫荧光法检测细胞膜表面细胞间粘附分子(ICAM)-1蛋白表达。同时利用原位杂交方法检测肿瘤坏死因子-α(TNFα)mRNA表达。结果:ELISA及间接免疫荧光法检测的结果提示暴露于1mg/LLPS后,HUVEC的vWF及ICAM-1表达明显强于对照组,加入Cap后,随Cap浓度增加明显下调LPS升高的vWF及ICAM-1表达,至Cap为10^-3mol/L时,其vWF与ICAM-1表达与LPS组有明显差别(P＜0.05)。Cap抑制LPS升高的vWF及ICAM-1表达呈一定的浓度依赖方式。原位杂交显示Cap10^-5mol/L及10^-3mol/L时表现明显下调TNFαmRNA表达,与LPS组比较差异明显(P＜0.05,P＜0.01)。结论:Cap对脂多糖诱导的HUVEC的活化及损伤有拮抗作用。

Antagonistic effect of captopril on activation and injury of vascular endothelial cells induced by lipopolysaccharide

AIM: To investigate the antagonistic action of Captopril (Cap) on the activation and injury of human umbilical vascular endothelial cells (HUVECs) induced by lipopolysaccharide(LPS) and the possible mechanisms. METHODS: After 18 h exposure of the cultured HUVECs to LPS (1 mg/L), or LPS (1 mg/L) plus Cap at the concentration of 10^-7mol/L, 10^-5mol/L and 10^-3mol/L, the expression of vWF protein in the conditioned media was tested by enzyme-linked immunosorbent assay (ELISA), the expression of ICAM-1 protein in HUVECs was determined by indirect immunofluorescence technique with flow cytometry as well. In addition, the expression of TNFα mRNA was determined by in situ hybridization. RESULTS: The results of ELISA and indirect immunofluorescence technique showed that exposure to LPS at a concentration of 1 mg/L led to a significant increase in the vWF and ICAM-1 expression in HUVECs as compared to the control (P＜0. 05), whereas they were somewhat decreased when exposed to Cap at three increasing concentrations mentioned above, especially in the Cap (10^-3mol/L) plus LPS group (P＜0.05). Cap inhibited vWF secretion and ICAM-1 expression of HUVECs caused by LPS in a concentration-dependent manner. In situ hybridization revealed that the expression of TNFα mRNA was inhibited by Cap both in a concentration of 10^-3mol/L, and in a lower concentration of 10^-5mol/L. CONCLUSION: Cap antagonizes the activation and injury of HUVECs induced by LPS, which may be related to the decrease in TNFα mRNA expression.