Abstract
Mutations in viral genomes that affect T-cell–receptor recognition by CD8+ cytotoxic T lymphocytes have been shown to allow viral evasion from immune surveillance during persistent viral infections. Although CD4+ T-helper cells are crucially involved in the maintenance of effective cytotoxic T-lymphocyte and neutralizing-antibody responses, their role in viral clearance and therefore in imposing similar selective pressures on the virus is unclear. We show here that transgenic virus-specific CD4+ Tcells, transferred into mice persistently infected with lymphocytic choriomeningitis virus, select for T-helper epitope mutant viruses that are not recognized. Together with the observed antigenic variation of the same T-helper epitope during polyclonal CD4+ T-cell responses in infected pore-forming protein-deficient C57BL/6 mice, this finding indicates that viral escape from CD4+ T lymphocytes is a possible mechanism of virus persistence.
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Acknowledgements
We appreciate the help in the generation of DNA sequence data of D. Zimmermann and his group. This work was supported by the Swiss National Science Foundation grants 31.50900.97 and 31.50884.97, and the Kanton of Zurich.
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Ciurea, A., Hunziker, L., Martinic, M. et al. CD4+ T-cell–epitope escape mutant virus selected in vivo. Nat Med 7, 795–800 (2001). https://doi.org/10.1038/89915
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DOI: https://doi.org/10.1038/89915
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