抗双链DNA自身抗体的抗肿瘤作用

目的　体内外探讨抗双链DNA(anti dsDNA)自身抗体对肿瘤生长的影响。方法　用灭活的肿瘤细胞免疫BALB/c小鼠 ,于初次免疫后第 8周 ,分别用SP 2 / 0和Wehi1 6 4肿瘤细胞攻击。将肿瘤细胞与免疫血清先行孵育后再接种正常小鼠 ,分别观察肿瘤的生长情况。结果　体内研究结果显示 ,经肿瘤细胞免疫诱导产生的anti dsDNA自身抗体具有抑制肿瘤生长的作用。体外研究结果显示 ,anti dsDNA自身抗体对肿瘤细胞的生长有抑制作用 ,其机制可能与诱导肿瘤细胞凋亡有关 ,且其诱导SP 2 / 0和Wehi 1 6 4肿瘤细胞发生凋亡的能力与亲和力有显著相关性 (r=0 .990 ,P <0 .0 1和r =0 .90 1 ,P <0 .0 5 )。结论　Anti dsDNA自身抗体具有抗肿瘤作用。

Anti-tumor effect of anti-dsDNA autoantibodies

OBJECTIVE: To investigate effects of anti-dsDNA autoantibodies on growth of tumor in vitro and in vivo. METHODS: BALB/c mice were inoculated with inactivated tumor cells and challenged s.c. with SP 2/0 and Wehi 164 tumor cells four weeks after the last inoculation. The na?ve mice were inoculated with SP 2/0 tumor cells immediately after incubating with sera derived from the immunized mice at week 6. Then the tumor size was examined. In vitro, the cytotoxicity of anti-dsDNA autoantibodies to tumor cells was analysed. Furthermore, apoptosis of SP 2/0 and Wehi 164 tumor cells induced by anti-dsDNA autoantibodies was examined by FACS. RESULTS: In vivo study showed that the growth of SP 2/0 and Wehi 164 tumors were inhibited in mice with anti-dsDNA autoantibodies, but not in mice lack of anti-dsDNA autoantibodies. In vitro, apoptosis of SP 2/0 and Wehi 164 tumor cells was induced when the tumor cells were incubated with the sera containing anti-dsDNA autoantibodies. Statistical analysis showed that the ability of anti-dsDNA autoantibodies to induce apoptosis of SP 2/0 and Wehi 164 tumor cells was significantly correlated with affinity (r = 0.990, P < 0.01 and r = 0.901, P < 0.05). CONCLUSION: Anti-dsDNA autoantibodies have inhibitory effect on tumor cells via inducing apoptosis.