腺病毒介导的反义AT1R转染对血管平滑肌细胞迁移的影响

目的:观察腺病毒介导的反义AT1基因转染对培养的大鼠动脉平滑肌细胞(VSMCs)迁移的影响。方法:用定向克隆和同源重组方法构建携带人反义AT1基因的复制缺陷型重组腺病毒(AdCMV/ahAT1),转染体外培养的VSMCs,用RT-PCR半定量法和免疫组化法检测AT1R的表达,用改良趋化小室法检测细胞迁移。结果:与对照组相比转染AdCMV/ahAT1后48h的VSMCs,AT1RmRNA表达少50%,AT1R的蛋白表达也显著低下(P＜0.01);迁移距离为(41.7±9.7)μm,显著短于空白对照组(77.5±12.7)μm和Ad/CMV.LacZ组(77.2±10.6)μm,均为P＜0.01。结论:腺病毒介导的反义hAT1R转染,通过抑制AT1R的表达,明显抑制了大鼠VSMCs的迁移。

Effect of adenoviral vector containing AT1 receptor antisense cDNA on migration of vascular smooth muscle cells

AIM: To evaluate the role of human angiotensin II (AngII) type 1 receptor (AT1R) antisense cDNA (ahAT1) on migration of cultured artery smooth muscle cells (VSMCs). METHODS: Two recombinant adenoviral vectors, Ad/CMV.ahAT1 containing full length antisense cDNA targeting to human AT1R mRNA, and Ad/CMV.LacZ containing LacZ called report gene, were constructed by orientation clone technology and homologous recombination, and then were used to transfect VSMCs in vitro. AT1R expression detected by RT-PCR and immunohistochemistry, and migration of VSMCs measured by Boyden's Chamer methods, were compared between transfected and nontransfected VSMCs. RESULTS: Forty-eight hours after Ad/CMV. ahAT1 transfection, the level of AT1R mRNA decreased markedly (50% of control group), and AT1R protein expression was significantly less (P＜0.01 vs control-group and Ad/CMV.LacZ-group, respectively) in VSMCs. So it was migration distance of VSMCs among the three groups. CONCLUSION: These results indicate that antisense cDNA targeting to human AT1R transfer in vitro mediated by adenoviral vector has a powerful inhibitory effect on migration of VSMCs by attenuating AT1R expression.