腺病毒介导的血管内皮生长因子联合干细胞生长因子治疗严重肢体缺血的实验研究

Experimental study on treatment of severe limb ischemia with Ad⁃hVEGF⁃hHGF gene

目的 探究血管内皮生长因子(VEGF)和干细胞生长因子(HGF)双基因腺病毒载体在缺血组织中促血管生成的作用及疗效。方法 将84只昆明小鼠随机分为假手术组、空白对照组、VEGF组、HGF组、VEGF+HGF组,构建左侧下肢缺血模型,血流仪观察缺血组织血运情况,Western blot及ELISA检测各组小鼠不同时间点VEGF、HGF表达,免疫组织化学染色检测缺血组织的血管生成情况(CD31、SMA),以小鼠治疗期间副作用评估安全性。结果 建模成功后,各组小鼠左侧下肢血流流速均显著下降;术后第7天,各组小鼠左侧下肢血流流量均明显优于术后即刻(P <0.05),且Ad-VEGF-HGF组小鼠左下肢血流量明显优于其他各组(P <0.05);术后28 d Ad-VEGF-HGF组小鼠左下肢血流量逐步稳定,且术后Ad-VEGF-HGF组小鼠血流明显优于其余各组,且VEGF组、HGF组均显著优于对照组(P <0.05);Western Blot及ELISA检测发现术后7、14、28 d时Ad-HGF组、Ad-VEGF组、Ad-VEGF-HGF组HGF蛋白、VEGF蛋白均明显高于对照组(P <0.05),且14 d Ad-VEGF-HGF组的表达水平处于相对峰值(P <0.001),术后第28天时表达水平逐步降低至术前水平。结论 Ad-VEGF-HGF基因注射可显著提高小鼠体内VEGF和HGF蛋白的表达水平并快速达到相对峰值水平,继而进一步促进下肢缺血后的血管生成,增加血流量,改善下肢循环。

Objective To explore the role and efficacy of VEGF and HGF gene adenovirus vector in promoting angiogenesis in ischemic tissue.Methods 84 Kunming mice were randomly divided into sham group,control group,VEGF group,HGF group and VEGF+HGF group,and the left lower limb ischemia model was established.The blood supply of ischemic tissue was observed by rheometer,and the expression levels of VEGF and HGF in each group were detected by Western Blot and ELISA.Immunohistochemical staining was used to detect angiogenesis(CD31,SMA)in ischemic tissues.Safety was assessed by side effects during treatment in mice.Results After the successful modeling,the blood flow velocity of the left lower limb in each group decreased significantly.On the 7th day after operation,the blood flow of the left lower limb in each group was significantly better than that on the 0th day after operation(P<0.05),and the blood flow of the left lower limb in Ad-VEGF-HGF group was significantly better than that in other groups(P<0.05).On the 28th day after operation,the blood flow of the left lower limb in Ad-VEGF-HGF group gradually stabilized,the blood flow in Ad-VEGF-HGF group was significantly better than that in other groups,and both VEGF group and HGF group were significantly better than the control group(P<0.05).On the 7th,14th,and 28th days following surgery,HGF and VEGF protein levels in the Ad-HGF,Ad-VEGF,and Ad-VEGF-HGF groups were substantially greater than those in the control group(P<0.05).The expression level in the Ad-VEGF-HGF group peaked on the 14th day(all P<0.001)and subsequently declined to preoperative levels on the 28th day after operation.Conclusion Ad-VEGF-HGF gene injection can effectively boost VEGF and HGF protein expression and rapidly reach the relative peak level,encour⁃aging angiogenesis after lower limb ischemia,increasing blood flow,and improving lower limb circulation.