前列腺素E1对人脐静脉内皮细胞单核细胞趋化蛋白-1表达的影响

摘要

Objective To investigate the effect of prostaglandin E1(PGE1) on the expression of monocyte chemoattractant protein-1(MCP-1)in human umbilical vein endothelial cells (HUVECs) and its possible mechanism. Methods Endothelial cells were incubated with oxidized low-density lipoprotein (ox-LDL group) in the presence or absence of prostaglandin E1. The level of MCP-1 in the supernatants was determined by enzyme linked immunosorbent assay (ELISA), the expression of MCP-1 mRNA in cultured endothelial cells was detected by in-situ hybridization and the protein expression of NF-κB was analyzed by Western blot. Results Compared with ox-LDL(100 μg/ml),PGE1 markedly lowered the levels of MCP-1[(0. 327±0. 051),(0. 214±0. 213),(0. 247±0. 228)pg/ml vs. (0. 655±0. 013)pg/ml], inhibiting the expression of MCP-1 mRNA [(0. 061±0. 008), (0. 033±0. 006),(0. 026±0. 004)A/μm2 vs. (0. 220±0. 032)A/μm2] in the cultured HUVECs in a dosedependent manner (0. 001, 0. 01, 0.1 mol/L). Western blot analysis demonstrated that the amount of NF-κB p65 was attenuated after treatment with prostaglandin E1 for 24 hours. Conclusions Prostaglandin E1 can downregulate the expressions of MCP-1 and NF-κB induced by ox-LDL in HUVECs, which may thereby defend the blood vessel endothelial cell function.%目的 探讨前列腺素E1(PGE1)对人脐静脉内皮细胞单核细胞趋化蛋白-1(monocyte chemoattactant protein-1,MCP-1)表达的影响及可能机制.方法 用培养的人脐静脉内皮细胞观察氧化低密度脂蛋白(ox-LDL)对MCP-1、核因子(NF)-κB表达的影响及PGE1的干预作用.采用ELISA检测上清液MCP-1浓度,原位杂交检测MCP-1 mRNA的表达,免疫印迹检测NF-κB蛋白表达.结果 (1)PGE1(0.001、0.010、0.100 mol/L)组与ox-LDL(100 μg/ml)组比较,MCP-1蛋白表达为(0.327±0.051)、(0.214±0.213)、(0.247±0.228)pg/ml对(0.655±0.013)pg/ml,MCP-1mRNA表达为(0.061±0.008)、(0.033±0.006)、(0.026±0.004)吸光度(A)/μm2对(0.220±0.032)A/μm2,PGE1显著抑制了ox-LDL所诱导的MCP-1改变.(2)Western blot结果显示,PGE1呈浓度依赖性抑制ox-LDL所诱导的NF-κB P65蛋白表达.结论 PGE1可抑制ox-LDL诱导的内皮细胞MCP-1及NF-κB表达上调,这可能与PGE1介导的血管内皮保护作用有关.