Recognition of Homo- and Heterosubtypic Variants of Influenza A Viruses by Human CD8+ T Lymphocytes

Adrianus C.M. Boon, Gerrie De Mutsert, Debbie Van Baarle, Derek J. Smith, Alan S. Lapedes, Ron A.M. Fouchier, Kees Sintnicolaas, Albert D.M.E. Osterhaus, Guus F. Rimmelzwaan

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98 Scopus citations

Abstract

In the present study, the recognition of epitope variants of influenza A viruses by human CTL was investigated. To this end, human CD8+ CTL clones, specific for natural variants of the HLA-B*3501-restricted epitope in the nucleoprotein (NP418-426), were generated. As determined in 51Cr release assays and by flow cytometry with HLA-B*3501-peptide tetrameric complexes, CTL clones were found to be specific for epitopes within one subtype or cross-reactive with heterosubtypic variants of the epitope. Using eight natural variants of the epitope, positions in the 9-mer important for T cell recognition and involved in escape from CTL immunity were identified and visualized using multidimensional scaling. It was shown that positions 4 and 5 in the 9-mer epitope were important determinants of T cell specificity. The in vivo existence of CD8+ cells cross-reactive with homo- and heterosubtypic variants of the epitope was further confirmed using polyclonal T cell populations obtained after stimulation of PBMC with different influenza A viruses. Based on the observed recognition patterns of the clonal and polyclonal T cell populations and serology, it is hypothesized that consecutive infections with influenza viruses containing different variants of the epitope select for cross-reactive T cells in vivo.

Original languageEnglish
Pages (from-to)2453-2460
Number of pages8
JournalJournal of Immunology
Volume172
Issue number4
DOIs
StatePublished - Feb 15 2004
Externally publishedYes

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