IL-2体外诱导健康人外周血T细胞TCRβ链CDR3谱系漂移的研究

目的 研究IL-2对体外培养的T细胞TCRβ链CDR3谱系漂移的影响.方法 分离健康志愿者外周血T细胞,加入IL-2,常规体外培养,乳酸脱氢酶释放法检测其非特异性杀伤活性;采用免疫谱型分析技术,分析其CDR3长度以判断T细胞的克隆性.结果 3例健康志愿者外周血T细胞对鼻咽癌细胞系CNE2没有杀伤作用;PBMC的TCR Vβ CDR3谱型均呈高斯分布,经IL-2体外培养后部分家族出现不同的优势表达.结论 IL-2对体外培养的T细胞TCRβ链CDR3谱系漂移有一定影响,对其非特异性杀伤无影响.

Complementarity-determining region 3 analysis of T cell receptor beta chain variable region in peripheral blood mononuclear cells cultured with interleukin-2

OBJECTIVE: To analyze the drift of the complementarity-determining region 3 (CDR3) of T cell receptor beta (TCRbeta) chain variable region in T cells of healthy volunteers cultured with interleukin-2 (IL-2). METHODS: T cells were isolated from the peripheral blood and cultured in vitro in the presence of IL-2. The non-specific killing effect of the cells was analyzed by LDH releasing assay, and the distribution of TCRbeta chain CDR3 in healthy volunteers by immunoscope spectratyping method to evaluate the clonality of the T cells. RESULTS: The results showed Gaussian distribution of TCR Vbeta gene CDR3 in healthy volunteers. The T cell cultured with IL-2, however, displayed some anomalous and oligoclonal expansion in different TCR Vbeta families without killing effect against nasophargngal carcinoma cell line CNE2. CONCLUSION: IL-2 may affect TCRbeta chain CDR3 distribution in T cells cultured in vitro.