增殖型腺病毒介导的人内皮抑素基因治疗胰腺癌

目的 观察携带人内皮抑素基因的双重调控增殖型腺病毒(AdTPHre-hEndo)对胰腺癌的治疗作用.方法 通过病毒重组技术将人内皮抑素基因克隆入双重调控增殖型腺病毒基因组中,获得腺病毒滴度为3.25×1010pfu/ml;通过建立SW-1990胰腺癌细胞Balb/c裸鼠皮下移植瘤模型,分析基因转导后胰腺癌组织中内皮抑素的表达情况及对肿瘤血管的抑制作用.结果 构建了AdTPHre-hEndo;AdTPHre-hEndo组荷瘤裸鼠肿瘤体积显著低于携带人内皮抑素基因的重组腺病毒(Ad-hEndo)组(P＜0.01)和选择性增殖型腺病毒(ONYX-015)组(P＜0.05);AdTPHre-hEndo组内皮抑素表达量明显高于Ad-hEndo组和对照组(P＜0.01).AdTPHre-hEndo组肿瘤微血管密度(MVD)为6.8±2.5,Ad-hEndo组和对照组MVD分别为16.0±4.6(P＜0.01)、47.2±10.0(P＜0.01).结论 所构建的AdTPHre-hEndo可有效表达具有生物学活性的内皮抑素,使肿瘤内微血管生成减少,肿瘤细胞增殖减慢,具备应用于胰腺癌临床治疗的潜力.

Treatment of pancreatic cancer by replicating adenovirus mediated human endostain gene in nude mice

Objective To investigate the effect of a dual regulation of replicating adenovirus vector carrying human endostatin gene (AdTPHre-hEndo) on pancreatic cancer. Methods Human endostatin (hEndo) gene was cloned into the genome of replicating adenovirus specific for the tumor cells by virus recombination technology. The virus titer was 3.25 × 1010pfu/ml. A Balb/c nude mouse model carring sw1990 cells pancreatic cancer was established, the expression of human endostain and inhibition of tumor cells in vivo were detected. Results We successfully constructed AdTPHre-hEndo. The inhibition on pancreatic cancer cell line SW-1990 of AdTPHre-hEndo is better than Ad-hEndo (P ＜0. 01 ), and ONYX-015 ( P ＜ 0. 05 ). The endostatin expression of AdTPHre-hEndo group was significantly higher than Ad-hEndo group and the control group (P ＜ 0. 01 ). The intratumoral MVD also decreased significantly in the treated tumors(6. 8 ±2. 5 vs. 16. 0 ±4. 6、47. 2 ± 10. 0, P ＜0. 01 ). Conclusions The recombination adenovirus can express biologically active hEndo effectively, which results in inhibiting the growth of micro-blood vessels and proliferation slowly.