EBV特异性细胞毒淋巴细胞的体外诱导和对鼻咽癌细胞的杀伤活性

目的 探索体外诱导和扩增EBV特异性细胞毒T淋巴细胞(CTL)的方法,探讨其应用于鼻咽癌(NPC)治疗的可能性.方法 用EB病毒转化的B淋巴细胞系为抗原递呈细胞及抗原刺激剂,经照射灭活后刺激自体外周血单个核细胞(PBMC),产生EBV特异性CTL,以抗人CD3抗体OKT-3/同种异体PBMC法扩增.并检测其对NPC细胞的特异性杀伤.结果 在体外有效诱导和扩增了EBV特异性的CTL.扩增前CTL对自体BLCL的杀伤率为76%,对同种异体BLCL的杀伤率为13%,对自体肿瘤细胞的杀伤率为51%,对CNE鼻咽癌细胞的杀伤率为27%.扩增后的杀伤率分别为63%、25%、49%、33%.扩增后CTL对肿瘤杀伤力没有明显下降.结论 EBV特异性CTL能在体外有效地诱导,对NPC细胞有特异性的杀伤力,能在体外大量地扩增,且扩增后对肿瘤的杀伤力没有明显下降,有望成为NPC患者有效的过继免疫治疗方法.

In vitro induced and expanded Epstein Barr virus-specific cytotoxic T lymphocytes can specifically kill nasopharyngeal carcinoma cells

OBJECTIVE: To establish a method for efficient induction and expansion of Epstein Barr virus (EBV)-specific cytotoxic T lymphocytes (CTL) in vitro and evaluate the possibility of using this strategy for treatment of nasopharyngeal carcinoma (NPC). METHODS: EBV-transformed B lymphoblastoid cells (BLCLs) were used as the antigen stimuli and antigen-presenting cells. EBV-specific CTL was induced by co-culture of the autologous peripheral blood mononuclear cells (PBMCs) and the irradiated BLCLs, and expanded with a cocktail method consisting of OKT-3, irradiated homologous PBMC, and IL-2. The specific activity of the CTL against the NPC cells was measured with MTT assay. RESULTS: EBV-specific CTL was successfully induced and expanded by 600 folds. The killing efficiency of the CTL was 76% for autologous BLCLs, 13% for homologous BLCLs, 51% for autologous NPC cells, and 27% for homologous CNE cell line, and after expansion, the corresponding killing efficiencies were 63%, 25%, 49%, and 33%, respectively. The non-specific killing only slightly increased after the expansion. CONCLUSION: EBV-specific CTL can be successfully induced and expanded in vitro for pecific killing of autologous NPC cells, suggesting the potential of this strategy in the treatment of NPC.