体内直接导入转基因IL—2包装细胞的抗瘤作用

利用构建分泌人ＩＬ－２的逆转录病毒的包装细胞，直接体内注射，观察了对Ｂ１６小鼠黑色素瘤生长影响及转基因效果。狭缝印迹分析结果显示，Ｂ１６细胞在体内获得ＩＬ－２ｍＲＮＡ表达。同时，肿瘤生长受到抑制，表现在小鼠成瘤与存活时间延长，免疫功能也获得增强，ＩＦＮ－γ水平升高。本结果与本室以往报道的体外基因转移的动物实验结果相符，提示直接体内注射病毒包装细胞可转移外源基因及显示抑癌作用。

Antitumor effect on melanoma by in vivo direct injection of packaging cells transfected recombinant IL-2 gene]

Our previous studies showed that ex vivo transfer of human IL-2 gene into murine B16 melanoma cells resulted in the expression of IL-2 activity and had inhibitory effect on tumor growth in vivo. In this study, B16 melanoma bearing mice were injected directly with IL-2 recombinant PA317 cells. The in vivo gene transfer revealed significant reduction of tumor size and prolongation of survival of tumor bearing mice. Using slot blot analysis, the expression of IL-2 mRNA in tumor mass was detected and the IFN gamma activity was also enhanced in gene transferred mice. These results indicated that in vivo direct transfer of IL-2 recombinant retrovirual vector producing cells would induce transfer gene into tumor cells and exert its antitumor effect.