Survivin-siRNA对裸鼠视网膜母细胞瘤移植瘤的抑制研究

目的构建Survivin-siRNA真核重组质粒,转染裸鼠视网膜母细胞瘤玻璃体腔移植瘤中,探讨其对肿瘤组织中Survivin表达的抑制作用及诱导凋亡情况。方法构建针对Survivin mRNA特异的靶序列的Survivin-siRNA以及对照Scramble-siRNA。将Y79细胞种植至21只裸鼠玻璃体腔内,9d后随机平均分为mock对照组(注射K-PBS);Scramble对照组(注射带有非同源的Scramble-siRNA重组质粒);Survivin实验组(注射特异性Survivin-siRNA重组质粒)。10d后摘除肿瘤组织,利用半定量RT-PCR检测肿瘤组织Survivin mRNA;采用Western blot方法分析Survivin蛋白;HE染色、Survivin及Ki67免疫组化染色;TUNEL法检测肿瘤组织凋亡。结果真核重组质粒及视网膜母细胞瘤裸鼠玻璃体腔移植瘤模型均构建成功。半定量RT-PCR显示Survivin-siRNA在mRNA水平上抑制了Survivin基因转录(P0.01),Scramble组与mock组无差别(P0.05)。Western blot显示与mock组和Scramble组相比,实验组细胞的Survivin蛋白表达显著降低(P0.01)。HE染色普通光镜下观察,实验组与两对照组相比,在瘤组织内可见到较多死亡细胞;实验组移植瘤组织中Survivin蛋白表达与mock组和scramble组相比明显下降;实验组Ki67的表达较对照组下降明显,增殖指数明显下降(P0.01)。TUNEL法显示实验组肿瘤组织内可见大量细胞核染为棕黄色的凋亡细胞,对照组可见少许凋亡细胞,实验组凋亡指数明显高于对照组(P0.01)。结论成功构建的Survivin-siRNA重组质粒可以抑制裸鼠视网膜母细胞瘤移植瘤中Survivin基因转录和蛋白表达,诱导了肿瘤细胞凋亡。

The Experiment Study on Survivin-siRNA Inhibiting the Growth of Y79 Retinoblastoma Implantation Model in Nude Mice Vitreous Cavity

Objective To construct survivin siRNA eukaryotic expression vectors and evaluate their effect on the growth of Y79 retinoblastoma implantation model in nude mice vitreous cavity.Methods Survivin-siRNA and Scramble-siRNA were constructed.Y79 cells were injected into vitreous cavity of twenty-one nude mice.Mice were divided equally into three groups (mock,Scramble-siRNA,Survivin-siRNA) nine days later.Tumors were enucleated after ten days.Semi-quantitive RT-PCR was used to detect Survivin mRNA in tumor tissue...