Characterization Of Hla Dr13-Restricted Cd4(+) T Cell Epitopes Of Hepatitis B Core Antigen Associated With Self-Limited, Acute Hepatitis B

The HLA DR13 allele has been associated with a self-limited course of hepatitis B virus infection, possibly through the induction of a more vigorous hepatitis B core antigen (HBcAg) and/or hepatitis B e antigen-specific C1134(+) T cell response. HBcAg-specific CD4(+) T cell responses were investigated in three HLA DR13-positive subjects with self-limited, acute hepatitis B. HBcAg-specific, short-term T cell lines derived from these three subjects showed a dominant recognition of HBcAg peptides spanning aa 1-20 (P1), 11-30 (P2),41-60 (P5),111-131 (P12) and 141-160 (P15). In order to characterize these epitopes in more detail, CD4(+) T cell clones and cell lines were generated using HBcAg. Surprisingly, 11 of 12 T cell clones examined recognized P15; one recognized P10 (aa 91-111). Of four T cell lines, two recognized P15 and two recognized P5. By peptide mapping, the minimal epitope of P15 was located to residues (147)TVVRRRGRSP(156).