PMID: 7547687Apr 1, 1995Paper

Definition of a human T cell epitope from influenza A non-structural protein 1 using HLA-A2.1 transgenic mice

International Immunology
S ManV H Engelhard

Abstract

Previous results from this laboratory demonstrated that the dominant influenza A epitope recognized by HLA-A2.1-restricted cytotoxic T lymphocytes (CTL) from HLA-A2.1 transgenic mice was the matrix protein 1 (M1) peptide epitope that is immunodominant in human CTL responses. However, analysis of a large number of CTL lines revealed a subset of influenza A/PR/8/34-specific murine CTL that recognized an HLA-A2.1-restricted epitope distinct from M1. Using recombinant vaccinia viruses encoding different influenza gene segments, the epitope recognized by these CTL was shown to be derived from A/PR/8 non-structural protein 1 (NS1). Because these CTL did not recognize targets infected with the A/Alaska/6/77 strain of influenza, candidate peptide epitopes were synthesized based on sequences that included an HLA-A2.1-specific binding motif, and that differed between A/PR/8 and A/Alaska. All of these CTL recognized a nonamer and a decamer peptide which contained a common eight amino acid sequence and two distinct sets of binding motif residues. However, the nonamer peptide was able to sensitize CTL for half-maximal lysis at 80- to 2500-fold lower doses than either the octamer or decamer. The homologous peptide derived from A/Alaska NS1 c...Continue Reading

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