丝裂霉素诱导凋亡癌细胞致敏树突状细胞后的免疫应答

目的 观察树突状细胞(DC)从丝裂霉素诱导的凋亡胆管癌细胞获取抗原后,抗肿瘤免疫应答及对胆管癌细胞的特异性免疫杀伤效果。 方法 用粒细胞-巨噬细胞集落刺激因子(GM-CSF)加IL-4从人外周血分化、诱导DC,丝裂霉素在体外诱导培养的人胆管癌细胞凋亡,将DC、T淋巴细胞和凋亡胆管癌细胞共培养,同时设计不同类型肿瘤细胞(坏死胆管癌细胞及培养胆管癌细胞)作对照,7d后,分离、富集DC、T淋巴细胞进行免疫应答及肿瘤细胞杀伤试验。 结果 与凋亡胆管癌细胞共培养的DC可以有效提呈胆管癌细胞抗原,有强烈的免疫应答,刺激的细胞毒T淋巴细胞特异性地杀伤胆管癌细胞。 结论 丝裂霉素诱导凋亡癌细胞可以致敏rhGM-CSF加rhIL-4从人外周血单个核细胞诱导、扩增出的DC,并产生显著的杀伤胆管癌细胞的免疫反应,可望成为特异性免疫治疗肿瘤的一条新途径。

Immune response of dendritic cells acquiring antigens from apoptotic cholangiocarcinoma cells induced by mitomycin

Objective To investigate the anti-tumor immune response of dendritic cells (DCs) acquiring antigens from apoptotic cholangiocarcinoma cells and their therapeutic effects on cholangiocarcinoma cells. Methods DCs from human peripheral blood monocytes which acquired antigen capturing and processing capacity, characteristics of maturation, were established in vitro using granulocyte-macrophage colony-stimulating factor (GM-CSF) and interleukin-4 (IL-4). Then cholangiocarcinoma cells were induced to apoptosis with mitomycin. The three groups included (1) coculture of DCs, apoptotic cancer cells and T cells, (2) coculture of DCs, necrotic cancer cells and T cells, (3) coculture of DCs, cultured cancer cells and T cells. After 7 days, DCs and T cells were riched separately to perform anti-tumor cells test and immune response test. Results these cells had typical dendritic cell morphology, expressed high levels of CDla and B7, acquired antigen from apoptotic cells caused by mitomycin and could stimulate T cells to inhibite, even kill cholangiocarcinoma cells. Conclusions The DCs from peripheral blood monocytes induced by GM-CSF and IL-4 can efficiently present antigen derived from apoptotic cells caused by mitomycin, and stimulate T cells activity obviously. It maybe become an effective therapy for tumor.