神经生长因子对脑梗死大鼠VEGF、SDF-1的影响及其可能机制

摘要

Objective To investigate the effects and the possible mechanisms of nerve growth factor (NGF) on serum levels of vascular endothelial growth factor (VEGF) and stromal cell-derived factor 1 (SDF-1) protein expression in rats with focal cerebral ischemia.Methods Male Sprague-Dawley rats weighting 200 ～ 250 g were subjected to middle cerebral occlusion (MCAO).MCAO rats were randomly divided into NGF group,saline control group and NGF+PI3K antagonist group (n =12).The neurological function was evaluated on the 4th,7th day after MCAO,and the serum levels of VEGF and SDF-1 protein were measured by ELISA.Results The neurological function was better in rats of the NGF group than those of the saline control group and NGF+PI3K antagonist on the 4th,7th day after MCAO (P ＜ 0.05).The serum levels of VEGF and SDF-1 protein of the NGF group was significantly higher than that of the saline control group and NGF+PI3K antagonist group on the 4th day after MCAO (P ＜ 0.05).Conclusions Treatment with NGF may improve neurological function of rats with focal cerebral ischemia,and upregulate serum levels of VEGF and SDF-1 protein expression.PI3K/AKT signal pathway may have attended the above regulation.%目的:观察神经生长因子(NGF)对脑梗死大鼠血清血管内皮生长因子(VEGF)、基质细胞衍生因子-1(SDF-1)表达的影响,并探讨其可能的机制.方法:将200～ 250 g的SD雄性大鼠,采用线栓法制备大鼠的一侧大脑中动脉缺血再灌注损伤模型,通过随机法将大鼠随机分成NGF治疗组、溶剂对照组及NGF+PI3K拮抗剂组,每组12只.所有大鼠分别于造模后第4和7天行神经功能评分,采用酶联免疫吸附法检测大鼠脑梗死后第4天时血清VEGF及SDF-1的水平.结果:在脑梗死后第4和7天时,与溶剂对照组及NGF+PI3K拮抗剂组大鼠比较,NGF治疗组大鼠的神经功能评分较低(均P＜0.05).脑梗死后第4天时,NGF治疗组大鼠的血清VEGF及SDF-1水平均高于溶剂对照组、NGF+PI3K拮抗剂组(P＜0.05).结论:NGF治疗可改善成年大鼠脑梗死缺损的神经功能,并促进脑梗死大鼠血清VEGF及SDF-1的表达上调,PI3K/AKT信号通路可能参与上述作用的调控.