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J. Virol., 08 1997, 6011-6019, Vol 71, No. 8
HM Diepolder, JT Gerlach, R Zachoval, RM Hoffmann, MC Jung, EA Wierenga, S Scholz, T Santantonio, M Houghton, S Southwood, A Sette and GR Pape
In acute hepatitis C virus infection, 50 to 70% of patients develop chronic
disease. Considering the low rate of spontaneous viral clearance during
chronic hepatitis C infection, the first few months of interaction between
the patient's immune system and the viral population seem to be crucial in
determining the outcome of infection. We previously reported the
association between a strong and sustained CD4+ T-cell response to
nonstructural protein 3 (NS3) of the hepatitis C virus and a self-limited
course of acute hepatitis C infection. In this study, we identify an
immunodominant CD4+ T-cell epitope (amino acids 1248 to 1261) that was
recognized by the majority (14 of 23) of NS3-specific CD4+ T-cell clones
from four of five patients with acute hepatitis C infection. This epitope
can be presented to CD4+ T cells by HLA-DR4, -DR11, -DR12, -DR13, and
-DR16. HLA-binding studies revealed a high binding affinity for 10 of 13
common HLA-DR alleles. Two additional CD4+ T-cell epitopes, amino acids
1388 to 1407 and amino acids 1450 to 1469, showed a very narrow pattern of
binding to individual HLA-DR alleles. Our data suggest that the
NS3-specific CD4+ T-cell response in acute hepatitis C infection is
dominated by a single, promiscuous peptide epitope which could become a
promising candidate for the development of a CD4+ T-cell vaccine.
Copyright © 1997, American Society for Microbiology
Immunodominant CD4+ T-cell epitope within nonstructural protein 3 in acute hepatitis C virus infection
Department of Medicine II, Klinikum Grosshadern, and Institute for Immunology, University of Munich, Germany.
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