对 2例HCV持续性感染者 2个时间点NS3区C末端克隆测序 ,研究HCVNS3蛋白一个辅助T细胞表位 (氨基酸位 12 4 8 12 61)在HCV感染者体内的保守性 ;人工合成该表位进行淋巴细胞增殖试验和抑制试验 ,观察该表位引起免疫应答的水平和特点 ;通过刺激 休息 刺激多轮循环建立该表位特异性的T细胞系 ,并用流式细胞仪鉴定表型。结果发现该表位在 2个病人 2个时间点均未变化 ;观察的 2例HCV持续性感染者和 1例感染恢复者均对该表位有较强CD4 +T细胞应答。建立了针对该表位的表型均一的CD4 +辅助T细胞系。本研究提示该表位是一个序列保守的强辅助T细胞表位 ,对HCVT细胞疫苗的研制有一定意义。

The genes of C terminal of HCV NS3 region of two chronic patients in two different time were sequenced to analyse the conservation of a helper T cell epitope in HCV NS3 protein (amino acids 1248 to 1261). The epitope was synthesized and the immune response to it in a self limited patient and two chronic patients was detected using T lymphocyte proliferation assay and inhibition experiment. The epitope specific T cell line was established by several cycles of stimulation relax stimulation and analysed with a FACScan. The results indicated that the epitope didn't change in two chronic patients, all three patients had strong CD4 + T cell reponse to the epitope, and epitope specific CD4 + T cell line was established. These data suggest that the eptiope is a conserved strong helper T cell epitope and could become a promising candidate for designing a CD4 + T cell vaccine.