鼻咽癌患者外周血γδ T细胞的体外扩增及对鼻咽癌细胞的体外杀伤活性

目的：通过体外扩增鼻咽癌（NPC）患者外周血γδT细胞，研究对NPC细胞体外细胞毒作用，以探讨γδT细胞在NPC免疫机制中的作用。方法：用抗体固相法体外扩增7例NPC患者（NPC组）及6例健康者（对照组）的外周血γδT细胞，以流式细胞仪检测γδT细胞亚型，对MTT法观察不同来源的γδT细胞在不同效靶比条件下，对Daudi、CNE1和CNE2细胞的细胞毒作用。结果：对照组与NPC组外周血γδT细胞经体外扩增，纯度可达到82％以上，其中90％为Vγ/Vδ2亚型；γδT细胞对Daudi、CNE1和CNE2细胞显示出作用强度相同的细胞毒作用（P＞0．05）。随效靶比升高，γδT细胞对CNE1和CNE2的细胞毒作用明显增强，在相同效靶比时对Daudi细胞的细胞毒作用最强。结论：NPC患者外周血γδT细胞对NPC细胞有明显体外杀伤作用。

The ex vivo expansion of γδ T cells from the peripheral blood of patients with nasopharyngeal carcinoma and their cytotoxicity to nasopharyngeals carcinoma lines in vitro

OBJECTIVE: gamma delta T cells from the peripheral blood of nasopharyngeal carcinoma(NPC) patients were expanded in vitro and their cytotoxic activity to NPC lines was analysed. A role of gamma delta T cell of immune mechanism in development of NPC was discussed. METHOD: The solid-phase monoclonal anti-TCR gamma delta McAb was used to expand the gamma delta T cells from peripheral blood of seven patients with NPC and six healthy donors. Then we detected the cytotoxicities of these gamma delta T cell against tumour cell lines including Daudi Burkitt's lymphoma and the cell lines of NPC, CNE1 and CNE2, at different effector:target (E:T) ratio by MTT method. The immunophenotyping of gamma delta T cells was detected by flow cytometry. RESULT: gamma delta T cell were obtained with a high purity (> 82%) from healthy individuals and NPC patients in which 90% of expanded cells were V gamma 9/V delta 2 subtype. The results of cytotoxicity assays revealed that activated gamma delta T cells from both healthy donors and patients lysed Daudi, CNE1 and CNE2 cells at similar level(P > 0.05) when E:T ratios increased, the level of cytotoxicity to each of the targets of CNE1 and CNE2 increased. These gamma delta T cells exhibited highest level of cytotoxicity to the Daudi cells in same ration of effector to target cell. CONCLUSION: gamma delta T cell of NPC could significantly kill NPC in vitro.