MHC-I-restricted epitopes conserved among variola and other related orthopoxviruses are recognized by T cells 30 years after vaccination

Sheila Tuyet Tang, M. Wang, K. Lamberth, M. Harndahl, M.H. Dziegiel, M.H. Claesson, Søren Buus, Ole Lund

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    It is many years since the general population has been vaccinated against smallpox virus. Here, we report that human leukocyte antigen (HLA) class I restricted T cell epitopes can be recognized more than 30 years after vaccination. Using bioinformatic methods, we predicted 177 potential cytotoxic T lymphocyte epitopes. Eight epitopes were confirmed to stimulate IFN-gamma release by T cells in smallpox-vaccinated subjects. The epitopes were restricted by five supertypes (HLA-A1, -A2, -A24 -A26 and -B44). Significant T cell responses were detected against 8 of 45 peptides with an HLA class I affinity of K(D) less than or equal to 5 nM, whereas no T cell responses were detected against 60 peptides with an HLA affinity of K(D) more than 5 nM. All epitopes were fully conserved in seven variola, vaccinia and cowpox strains. Knowledge of the long-term response to smallpox vaccination may lead to a better understanding of poxvirus immunity and may aid in the development of new improved vaccines and diagnostic tools.
    Original languageEnglish
    JournalArchives of Virology
    Volume153
    Issue number10
    Pages (from-to)1833-1844
    ISSN0304-8608
    DOIs
    Publication statusPublished - 2008

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