中文摘要：

乙型肝炎病毒（HBV）特异性CD8＋T细胞（CTL）介导的细胞免疫应答在控制HBV感染和病毒清除中至关重要,已鉴定的T细胞表位绝大多数都来自A,D基因型的乙肝病毒,而在我国流行的B,C型病毒表位研究较少.本研究合成重叠九肽肽库,通过细胞结合试验和体外重折叠实验系统筛选和鉴定B型和C型HBV核心蛋白表位,发现一个在60位氨基酸由L变异成V（L60V）而产生的新表位HBcAg60-68.表位肽能在HLA-A2/Kb转基因小鼠体内激发特异性CTL细胞免疫反应.检测HLA-A2阳性乙肝患者表位特异性CTL证明该九肽序列为体内自然加工的表位,这为研究HBV感染中特异性CTL免疫应答提供新的依据.

英文摘要：

Hepatitis B virus （HBV）-specific CD8＋ T lymphocytes （CTL） play a major role in the control and clearance of HBV infection. However, the majority of human leukocyte antigen （HLA） class I restricted epitopes have been defined in HBV genotypes A and D, but definitions are lacking in genotypes B and C, which are prevalent in China. In this study, the overlapping 9-mer peptide pools were used to screen and identify genotypes B- and C-derived HBcAg-specific T cell epitopes by HLA stabilization assays and in vitro re-folding assays. We identified a new epitope derived from a leucine to valine mutation at position 60 of the core protein （L60V）. This epitope can elicit CTL responses in HLA-A2/Kb transgenic mice. The defined HBV epitope was further characterized by investigating specific CTL responses in HLA-A2 positive patients with acute and chronic hepatitis B, indicating that the T cell epitope was naturally processed. These findings will provide a basis for the analysis of CTL responses in patients with HBV infection.