VEGF对缺血脑组织表达Fas/Fasl的影响

目的探讨VEGF治疗脑梗死的机制.方法用线拴法制成Wistar大鼠大脑中动脉永久性闭塞模型,将VEGF165真核表达质粒pUCCAGGS/hVEGF165经颅骨注入到缺血区.术后7d断头取脑,用逆转录PCR(RT-PCR)检测VEGF mRNA的表达强度,用免疫组织化学方法检测Fas、Fasl和VEGF的表达水平.结果与对照组相比,治疗组VEGFmRNA的表达增强,VEGF表达增高(P＜0.01),Fas、Fasl表达减弱(P＜0.01).结论VEGF165基因可以转化到缺血脑组织中并表达VEGF mRNA和VEGF,后者可能通过抑制Fas和Fasl的表达而保护神经细胞.

The Effect of VEGF on the Expression of Fas and FasL in Ischemic Brain Tissues

Objective To explore the mechanism of VEGF treating cerebral ischemia. Methods A rat model of middle cerebral artery occlusion (MCAO) was set up by nylon suture embolization. The naked plasmid DNA encoding vascular endothelial growth factor(pUCCAGGS/hVEGF 165 ) was directly injected through skull into the ischemic areas of brain. After seven days the rats were killed. RT-PCR was used to measure the expression of VEGF mRNA in the brain tissues, and immunohistochemistry was appllied to detect the expression of VEGF, Fas and Fas L in the brain tissues. Results Compared with control group, VEGF expression significantly increased in the therapeutic group(P<0.01), while Fas and FasL expression obviously decreased in the therapeutic group(P<0.01). Conclusion The results indicated that VEGF gene could be introduced into the ischemic brain tissues and express VEGF mRNA and protein. The VEGF protein could protect neuro-cells possibly by inhibting the expression of Fas and FasL.