一氧化氮在VEGF介导的内皮细胞增殖与分泌效应中的作用

目的: 探讨一氧化氮在血管内皮生长因子(VEGF)介导的血管内皮细胞增殖与分泌效应中所起的作用,了解VEGF可能的作用机制。方法:将体外培养的兔主动脉内皮细胞分成对照组、VEGF处理组和VEGF+N-硝基-L-精氨酸甲酯(L-NAME)处理组,采用四氮唑盐WST-1比色法、放免法和酶联免疫双抗体夹心法分别检测吸光值及内皮素-1和Ⅷ因子辅因子水平。结果:VEGF处理组吸光值明显高于VEGF+ L-NAME处理组,且均高于对照组(P＜0.01);VEGF处理组内皮素-1和Ⅷ因子辅因子水平明显低于VEGF+L-NAME处理组,且均低于对照组(P＜0.05和P＜0.01);提示VEGF能促进内皮细胞增殖,抑制内皮细胞分泌内皮素-1和Ⅷ因子辅因子,而L-NAME能部分拮抗VEGF的上述作用。结论:一氧化氮在VEGF促进内皮细胞增殖及抑制内皮细胞分泌内皮素 -1和Ⅷ因子辅因子中起中介作用,VEGF可能部分通过一氧化氮起作用,一氧化氮是VEGF作用机制中的一个重要信号通路。

Role of nitric oxide in proliferation and secretion effect of vascular endothelial cells induced by vascular endothelial growth factor

AIM: To investigate the role of nitric oxide in proliferation and secretion of vascular endothelial cells induced by vascular endothelial growth factorr (VEGF). METHODS: The in vitro cultured vascular endothelial cells of rabbit aorta were divided into control group, VEGF-treated group and VEGF L-NAME treated group, the absorbance (A) value of vascular endothelial cells, endothelin-1(ET-1) and von Willebrand factor (vWF) in the supernatant were examined by WST-1 assay, radioimmunoassay and ELISA. RESULTS: The A value in VEGF and VEGF L-NAME treated group were higher than that in control group (P<0.01). A value in VEGF group was higher than that in VEGF L-NAME group the ET-1 and vWF were markedly decreased in VEGF group compared with the control and VEGF L-NAME treated group (P<0.05, P<0.01). These results indicated that VEGF promoted the proliferation and inhibited the secretion of ET-1 and vWF in vascular endothelial cells, and L-NAME inhibited the effect of VEGF. CONCLUSION:Nitric oxide is an important mediator in the process of stimulating proliferation and regulating secretion of vascular endothelial cells by VEGF.