病毒蛋白22增强单纯疱疹病毒胸苷激酶/更昔洛韦基因治疗系统杀伤卵巢癌细胞的体内研究

目的　探讨病毒蛋白 2 2 (VP2 2 )的细胞间传递作用 ,以及其促进单纯疱疹病毒胸苷激酶(HSV TK ) 更昔洛韦 (GCV)基因治疗系统对卵巢癌移植瘤细胞的体内杀伤效应。方法　用慢病毒感染卵巢癌 3AO细胞 ,形成携带HSV TK基因的 3AO细胞 (3AO TK)及携带HSV VP2 2 TK融合基因的3AO细胞 (3AO VP2 2 TK)。分别在裸鼠皮下接种 10 %含卵巢癌 3AO TK(3AO TK组 )或 3AO VP2 2 TK(3AO VP2 2 TK组 )的混合细胞 ,并以接种单纯 3AO细胞裸鼠为对照 (3AO组 ) ,每组裸鼠 10只。当肿瘤体积达 15 0mm3后 ,分别于腹腔注射GCV 10mg kg、5 0mg kg。结果　注射 10mg kgGCV后 ,3AO TK组与 3AO VP2 2 TK组肿瘤体积、重量比较 ,差异有极显著性 (P <0 0 1) ,3AO VP2 2 TK组肿瘤生长明显受到抑制 ;注射 5 0mg kgGCV后 ,两组肿瘤体积、重量比较 ,差异无显著性 (P >0 0 5 )。注射GCV 10mg kg后 ,3AO TK组肿瘤抑制率为 37 7% ,3AO VP2 2 TK组肿瘤抑制率为 91 5 % ,两组比较 ,差异有极显著性 (P <0 0 1) ;注射GCV 5 0mg kg后 ,3AO TK组肿瘤抑制率为 81 8% ,3AO VP2 2 TK组肿瘤抑制率为 96 7% ,两组比较 ,差异无显著性 (P >0 0 5 )。结论　VP2 2介导的自杀基因产物细胞间扩散作用 ,可明显加强对体内肿瘤细胞的杀伤效应。

Tegument viral protein 22 enhanced cell-killing effect of the herpes simplex virus thymidine kinase/ganciclovir system on ovarian cancer in vivo

Objective To explore the enhanced cell-killing effect in vivo of herpes simplex virus thymidine kinase/ganciclovir(HSV-TK/GCV) gene therapeutic system using tegument viral protein (VP22) intercellular trafficking. Methods Human ovarian epithelial cancer cell line 3AO was infected by lentivirus containing HSV-TK and HSV-VP22-TK respectively. Tumors were induced in nude mice by subcutaneous injection of the mixture of 90% 3AO cells and 10% 3AO cells carried with HSV-TK(3AO/TK) or HSV-VP22-TK(3AO/VP22-TK).Nude mice injected with 3AO cells were used as blank control. When the volume of tumor was 150 mm 3, GCV was administered at 10 mg/kg or 50 mg/kg intraperitoneally. Results There were significant differences,in the tumor volume and weight between 3AO/TK group and 3AO/VP22-TK group after administration of 10 mg/kg GCV ( P <0.01 ), and the later was more efficient than the former. But there was no significant difference after administration of 50 mg/kg GCV ( P >0.05 ). The tumor inhibition rates in 3AO/VP22 group and 3AO/VP22-TK group were 37.7% and 91.5% respectively after administration of 10 mg/kg GCV ( P <0.01 ), and were 81.8% and 96.7% respectively after administration of 50 mg/kg GCV ( P >0.05 ). Conclusion These results clearly indicate that VP22 enhances the efficiency of the suicide gene transfer, thereby increases the cell-killing effect on tumor in vivo.