人卵巢癌细胞与自体或同种异体树突状细胞融合诱导抗肿瘤免疫

目的：探讨人卵巢癌(OVCA)细胞与自体或同种异体树突状细胞(DC)融合后体外诱导特异性CTL的作用。方法：用PEG法将OVCA细胞与自体或异体DC融合，在含GM-CSF的RPNH-1640完全培养基中继续培养7～14d，然后将融合细胞与CA-125特异性T细胞共同培养，用细胞内细胞素染色法检测其诱导CTL活性。结果：人类OVCA细胞表达CA-125、HER2A／neu、MUC1肿瘤相关抗原及MHC-Ⅰ类分子和粘附分子(ICAM)，但不表达MHC-Ⅱ类分子、B7-1和B7-2；DC则表达MHC-Ⅰ类和Ⅱ类分子、共刺激分子和ICAM，但不表达DF3／MUCl或CA-125等OVCA相关抗原，而OVCA细胞与自体或异体DC融合细胞则表达CA-125及MUC1肿瘤相关抗原、MHC-Ⅰ类和Ⅱ类分子、B7-1、B7-2及ICAM。结论：人OVCA与自体或异体DC融合细胞能诱导由MHC-Ⅰ类分子限制的CTL活性和自体肿瘤细胞的溶解作用。

Induction of anti-tumor activity by immunization with fusion of human ovarian carcinoma cellsto autologous or allogeneic dendritic cells

Objective:To study the effect of activation of specific anti-tumor cytotoxic T lymphocytes in vitro by fusion of human ovarian carcinoma cells with autologous or allogeneic dendritic cells.Methods:The human dendritic cells with ovarian carcinoma cells were fused by PEG and were cultivated in complete RPMI-1640 media containing 10% FCS, GM-CSF for 7～14 days,and then co-cultured fusion cells with CA-125 Specific T cells. The activation of anti-tumor CTL elicited by the fusion cells was detected by intracellular cytokine staining.Results:The human ovarian carcinoma cells expressed the CA-125,MUC1,MHC classⅠand ICAM, but not MHCclassⅡ,B7-1 or B7-2.In contrast, the DCs expressed MHC classⅠand class Ⅱ molecules, co-stimulative molecules and ICAM, but not CA-125 or MUC1 carcinoma-associated Ags. Fusion of the OVCA cells to autologous or allogeneic DCs resulted in the generation of heterokaryons that expressed the CA-125 and MUC1 Ags, MHC class Ⅰand classⅡ molecules,B7-1 and B7-2.Conclusions:The fusions of autologous or allogeneic DCs with ovarian carcinoma cells can induce cytotoxic T cell activity and lysis of autologous tumor cells by a MHCclassⅠ-restricted mechanism.