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Recently, we showed chronic hepatitis C to be associated with increased expression of HLA-E and identified peptide hepatitis C virus (HCV) core amino acids 35-44 as a ligand for HLA-E that stabilizes HLA-E expression, favoring inhibition of natural killer cell cytotoxicity. Here we describe HLA-E-restricted recognition of peptide HCV core amino acids 35-44 by CD8(+) T cells. Frequency of HLA-E-restricted responses was significantly higher in patients homozygous for the HLA-E(R) allele (60% vs 38%; P = .038). Moreover, we found that the HLA-E(R) allelic variant confers protection against chronic infection with HCV genotypes 2 and 3. Taken together, our data indicate an important immunomodulating function of HLA-E in hepatitis C.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

The HLA‐ER/HLA‐ERGenotype Affects the Natural Course of Hepatitis C Virus (HCV) Infection and Is Associated with HLA‐E–Restricted Recognition of an HCV‐Derived Peptide by Interferon‐γ–Secreting Human CD8+T Cells