局部注射小鼠白细胞介素12逆转录病毒包装细胞对大鼠肝癌的治疗

Treatment of Rat Hepatoma by Locally Injection of Murine IL-12 Retro-virus Packaging Cell

目的:为观察携带小鼠白细胞介素12(mIL-12)逆转录病毒包装细胞株在肝癌局部注射后,对体内肝癌治疗效果.方法:构建携带mIL-12的逆转录病毒载体,将该载体转染包装细胞系PA317,应用该包装细胞对实验性原位肝癌大鼠分别在不同时间进行治疗,观察其抗肿瘤作用,免疫功能变化,病理及毒性反应.结果:携带mIL-12逆转录病毒包装细胞(PA317-mIL-12)在原位肝癌局部注射后能明显抑制肝癌细胞生长,其早期治疗可使大鼠长期生存,中晚期治疗,大鼠虽然不能长期生存,但较空白对照组及携带空载体对照组的生存期明显延长,(P<0.01).其治疗组NK细胞及T细胞明显增加,其早期治疗效果优于中期治疗,另外,本研究对肝癌局部进行IL-12基因转染,可使另一叶肝癌消退,这表明IL-12可通过激活机体免疫细胞,杀灭未转染的肿瘤细胞,这对于临床应用IL-12基因治疗非常重要.同时,生存期超过2个月大鼠,再次接种相当数量的肝癌细胞,该大鼠不能再次形成肝癌.结论:肝癌局部注射IL-12基因能激发机体抗肿瘤免疫反应.

Objective: To investigate the therapeutic effects of the murine IL-12 retrovirus packaging cell line on hep-atoma injected locally. Methods: The retrovirus vector encoding mIL-12 gene was constructed and transfected into packaging cell line PA317. The cells were then used to treat the rats with experimental orthotopic hepatoma at different time. The therapeutic effects, immune functions of the hosts, pathological and toxicological responses were documented. Results: The results showed that the mIL-12 retrovirus packaging cell line could significantly inhibit the growth of the hepatoma cells injected locally to the hepatoma. The early treatment made the rats survive long, while the medium or late stage treatment could prolong the life time of the rats compared with the bland control group or bland vector control group, though the rats did not survive. The number of NK cells and T cells increased significantly in the treatment group. The effects of the early treatment were superior to those of the medium and late stage treatment. Moreover, the transfection of IL-12 gene locally in the hepatoma tissue could make the hepatoma disappear from other liver lobe. This phenomenon demonstrated that IL-12 could activate the immune cells of the host to kill the untransfected tumor cells. This is very important for IL-12 to be used in gene therapy clinically. Meanwhile, the hepatoma would not recur in the rats that had survived more than 2 months from the early treatment after being rechallenged with tumor cells. Conclusion: The results showed that IL-12 gene injected locally in the hepatoma tissue could enhance the anti-tumor immunity of the host.