Altered CD8(+) T cell immunodominance after vaccinia virus infection and the naive repertoire in inbred and F(1) mice.

The Journal of Immunology : Official Journal of the American Association of Immunologists
Inge E A FleschDavid C Tscharke

Abstract

Previous studies of CD8(+) T cell immunodominance after primary virus infection of F(1) mice compared with their inbred parents have generally concluded that no dramatic changes occur. In this study, we revisit this issue using vaccinia virus (VACV), which has a large genome, a recently defined immunodominance hierarchy in mice, and is a candidate vector for vaccines. We found that immunogenicity of VACV peptides defined using inbred mice was highly variable in F(1) progeny: some peptides were equally immunogenic in F(1) and inbred, whereas others elicited responses that were reduced by >90% in F(1) mice. Furthermore, the dominance of a peptide in the relevant inbred parent did not predict whether it would be poorly immunogenic in F(1) mice. This result held using F(1) hybrids of MHC-congenic mice, suggesting that MHC differences alone were responsible. It was also extended to foreign epitopes expressed by an rVACV vaccine. F(1) mice were less able to mount responses to the poorly immunogenic peptides when used as a sole immunogen, ruling out immunodomination. In addition, conserved TCR Vbeta usage between inbred and F(1) mice did not always correlate with strong responses in F(1) mice. However, direct estimation of naive precu...Continue Reading

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