Published in:
01-10-2008 | Original Article
MHC-I-restricted epitopes conserved among variola and other related orthopoxviruses are recognized by T cells 30 years after vaccination
Authors:
S. T. Tang, M. Wang, K. Lamberth, M. Harndahl, M. H. Dziegiel, M. H. Claesson, S. Buus, O. Lund
Published in:
Archives of Virology
|
Issue 10/2008
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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-γ 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.