Abstract
目的 观察核运输因子2(NTF2)在体外培养的人视网膜微血管内皮细胞(RCECs)中的表达,并探讨其高表达对RCECs中血管内皮生长因子(VEGF)表达的影响.方法 取中山眼科中心眼库的人眼球,分离视网膜组织用以培养人RCECs,并用Ⅷ因子抗体免疫组织化学法鉴定.免疫组织化学法观察细胞中NTF2的表达.通过重组腺相关病毒(rAAV2)将外源性NTF2导入培养的RCECs内,rAAV2-NTF2和rAAV2-EGFP转染RCECs,未转染组为对照组.激光共焦显微镜下观察增强型绿色荧光蛋白(EGFP)阳性细胞,逆转录聚合酶链反应(RT-PCR)法检测各组NTF2、VEGF mRNA的表达变化,并进行定量分析.结果 培养的RCECs呈典型铺路石样排列,荧光显微镜下可见Ⅷ因子阳性表达为绿色荧光,95%以上的活体细胞可摄取DiI标记的Ac-LDL,并在荧光显微镜下呈现红色荧光.RCECs可表达NTF2,主要位于细胞质内,富集于核周.rAAV2-EGFP转染后,激光共焦显微镜观察可见大量EGFP阳性细胞,实验组NTF2在mRNA水平表达明显强于GFP组和对照组(t=15.06,t=7.02,P＜0.01),VEGF表达明显下降(t=7.40,t=14.08,P＜0.01).结论 rAAV2-NTF2转染视网膜内皮细胞后,NTF2可稳定高表达,VEGF表达下降,NTF2可能通过调节VEGF的表达参与新生血管的发生。
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