CD80 CD86和CD137L基因联合表达对小鼠肝癌种植模型肿瘤免疫原性的影响

目的探讨CD80、CD86和CD137L基因联合表达对肿瘤免疫原性的影响。方法按接种变异瘤株不同,将BALB／C小鼠随机分成A组（H22．Wt细胞）、B组（H22-neo细胞）、C组（H22-CD80／CD86^＋细胞）、D组（H22．CD137L^＋细胞）、E组（H22-CD80／CD86／CD137L^＋细胞）5组,建立H22．BALB／C小鼠荷肝癌模型,A、B组为对照组。观察小鼠成瘤率、成瘤潜伏期、荷瘤鼠存活率及肿瘤增殖情况。通过复种试验观察转基因对H22变异株免疫原性和机体免疫保护作用的影响。结果E组首次接种成瘤率仅有50．0％,显著低于其余4组（P〈0．01）。首次接种后,C组荷瘤鼠肿瘤生长受到明显抑制,有2只荷瘤鼠肿瘤完全消退。E组肿瘤生长所受抑制较C组更为明显,肿瘤峰值体积显著小于C组,且有3只荷瘤鼠肿瘤完全消退。其余3组荷瘤鼠未见肿瘤完全消退。与A、B、D组相比,C、E组荷瘤鼠生存率显著改善（P〈0．01）,而C、E两组荷瘤鼠生存率差异无统计学意义（P〉0．05）。复种试验表明,C、E组荷瘤鼠再次成瘤率低于对照组,E组与C组差异也有统计学意义（P〈0．01）;第3次接种后,E组成瘤率显著低于C组（P〈0．01）。E组中5只首次接种未成瘤的小鼠,于第21天重复接种H22-Wt细胞,小鼠100％排斥肿瘤,于第56天第3次接种H22／Wt细胞,小鼠仍然100％排斥肿瘤。结论CD80＋CD86和CD137L单独或者联合表达均可显著降低野生型H22细胞株致瘤性,CD80、CD86和CD137L基因联合表达显著改善了野生型H22细胞的免疫原性。

Impact of co-expression of CD80, CD86 and CD137L genes on tumor immunogenicity in HCC H22-BAL b/c mouse model

Objective To understand the influence of co-expression of CD80, CD86 and CD137L genes on tumor immunogenicity in hepatocellular carcinoma H22-BAL B/c mouse models. Methods The mice were randomly divided into five groups, named A, B, C, D and E, and control groups A and B, 20 mice in each group. Hepatocellular carcinoma H22-BAL B/c mouse model was established by subcutaneous injection of cells H22-Wt, H22-neo, H22-CD80/CD86+ , H22-CD137L+ and H22-CD80/CD86/CD137L+, respectively. The rate and incubation period of tumor development, survival rate, and the tumor growth in vivo were observed and recorded. The effects of gene transduction on immunogenicity of the tumor and antitumor immunity of the animals were assessed by re-innoculation of wild type H22 cells. Results The rate of tumor development in group E was only 50% , much lower than that in other four groups (P <0. 01). The tumor growth in group C was reduced with complete tumor regression in two hosts (20% , 2/10). In group E, there was more pronounced reduction of tumor size. The maximal tumor sizes were remarkably smaller than those of group C, and there was complete tumor regression in three mice (60% , 3/5 ). No tumor regression was found in the other three groups. Survival rates of group C and E were significantly higher than that of animals in groups A, B and D (P < 0. 01 ) , but no significant difference was seen between group C and E. The results of re-inoculation test showed that tumor formation rate was 40% (4/10) in group C, 100% (8/8) in group D, and 0 (0/5) in group E. There were significant differences between groups C and E and control group, between group E and C, but not between C and D. After the third time of re-inoculation with H22-Wt cells at the 56th day, tumor occurred in 6/6 mice (100% ) of group C, but 0 (0/5) in group E. The difference was very significant. Five animals without tumor formation after the first inoculation in group E, were re-inoculated with H22-Wt cells on the 21st day and the third re-inoculation on the 56th day, no tumor was found (0/5). Conclusion Both co-expression and solo-expression of CD80 + CD86 and CD137L genes reduce the tumorigenicity of wild type H22 cells, but co-expression of CD80, CD86 and CD137L genes can more significantly improve the immunogenicity of H22-CD80/CD86/CD137L+ cells.