转染VEGF基因提高游离自体颗粒脂肪移植物存活率的实验研究

目的 研究转染人血管内皮生长因子基因(VEGF)对大鼠游离的自体脂肪移植后移植物存活的影响.方法 SD大鼠48只,分为3组,每组16只.于自体游离颗粒脂肪移植时分别注入脂质体包裹的重组VEGF质粒(目的 基因组)和空白质粒(空白质粒组)以及生理盐水(生理盐水组).术后定期计算植入物后前重量比,并行HE染色观察组织病理改变,免疫组化法检测组织的VEGF表达水平及微血管密度.结果 目的 基因组在移植物重量改变方面显著小于空白质粒组及生理盐水组(P＜0.05),其VEGF表达及微血管密度均显著高于其他两组(P＜0.01),空白质粒组及生理盐水组差异无统计学意义.结论 脂质体包裹的VEGF基因质粒能够在脂肪组织中表达VEGF,诱导新血管的形成,减少移植组织的吸收.

Experiment on autologous free granular fat transplantation with rhVEGF gene in rats

OBJECTIVE: To investigate the effects of rhVEGF on autologous free granular fat grafts in rats. METHODS: Forty-eight Sprague-Dawley rats were randomly divided into three groups, sixteen of each. After the autologous free granular fat transplantation, all groups were treated with the plasmid DNA containing cDNA encoding rhVEGF, the blank plasmid DNA and normal saline respectively as the experimental group, the negative group and the saline group. After 3, 7, 15, 30 days, the rats were sacrificed and the grafts were weighted accurately. Histological pathology was evaluated. Micro-vessel count and the expression of vascular endothelial growth factor (VEGF) were examined by immunohistochemical staining. RESULTS: The weights of the two latter groups were significantly reduced on the 7, 15, 30 day compared with the experimental group. The expression of VEGF and the micro-vessel count in the experimental group were significantly higher than the other two groups during the latter periods. CONCLUSION: The cDNA encoding VEGF can induce the expression of VEGF in fat graft, angiogenesis and reduce the free fat graft absorption.