携带lipocalin2基因溶瘤腺病毒治疗结肠癌移植瘤的实验研究

摘要

目的 探讨携带lipocalin 2基因的溶瘤腺病毒ZD55-lipocalin 2对结肠癌移植瘤的治疗作用.方法 选用SW620细胞构建结肠癌移植瘤模型,随机分为ZD-55组、Ad-lipocalin 2组、ZD55-lipocalin 2组及PBS对照组,瘤内注射相应病毒后观察移植瘤生长及裸鼠生存情况,计算移植瘤瘤重和抑瘤率.通过TUNEL调亡检测、免疫组化检测血管内皮细胞生成因子表达和微血管计数来观察ZD55-lipocalin 2对大肠癌的抑制作用.结果 ZD-55病毒组、Ad-lipocalin 2病毒组和ZD55-lipocalin 2病毒组抑瘤率分别为16.4%、18.9%、40.4%,凋亡指数分别为20.7%、19.3%、77.0%,微血管密度分别为34±6、30±6、11±4.ZD55-lipoealin 2组与其他各组相比差异有统计学意义(P＜0.05).结论 ZD55-lipocalin 2促进大肠癌细胞凋亡、抑制微血管生成,明显抑制大肠癌移植瘤生长.%Objective To investigate the antitumor activity of the oncolytic adenovirus expressing lipocalin 2 gene for colorectal cancer in vivo.Methods BALB/C nude mice subcutaneously inoculated by SW620 cells and grown tumors were treated with injection of ZD-55 virus, Ad-lipocalin 2 virus and ZD55- lipocalin 2 virus respectively.The weight of implanted tumors and the tumor inhibition rate were calculated to evaluate the anti-tumor effect.Cell apoptosis was determined by TUNEL and the protein expression of VEGF and MVD were determined with immunohistochemistry.Results ZD55-lipocalin 2 inhibited the growth of transplanted tumor more significantly than ZD-55 virus and Ad-lipocalin 2 virus ( P ＜ 0.05 ).Tumor cell apoptosis was upregulated and the MVD reduced significantly in ZD55-lipocalin 2 group in contrast to the other two groups (P ＜0.05).Conclusions ZD55-lipocalin 2 induces apoptosis of colorectal tumor cells and inhibits tumor microvascular formation, slowing down the growth of transplantation tumors.