Heterogeneity among viral antigen-specific CD4+ T cells and their de novo recruitment during persistent polyomavirus infection.

The Journal of Immunology : Official Journal of the American Association of Immunologists
Eugene LinA E Lukacher

Abstract

Virus-specific CD4(+) T cells optimize antiviral responses by providing help for antiviral humoral responses and CD8(+) T cell differentiation. Although CD4(+) T cell responses to viral infections that undergo complete clearance have been studied extensively, less is known about virus-specific CD4(+) T cell responses to viruses that persistently infect their hosts. Using a mouse polyomavirus (MPyV) infection model, we previously demonstrated that CD4(+) T cells are essential for recruiting naive MPyV-specific CD8(+) T cells in persistently infected mice. In this study, we defined two dominant MPyV-specific CD4(+) T cell populations, one directed toward an epitope derived from the nonstructural large T Ag and the other from the major viral capsid protein of MPyV. These MPyV-specific CD4(+) T cells vary in terms of their magnitude, functional profile, and phenotype during acute and persistent phases of infection. Using a minimally myeloablative-mixed bone marrow chimerism approach, we further show that naive virus-specific CD4(+) T cells, like anti-MPyV CD8(+) T cells, are primed de novo during persistent virus infection. In summary, these findings reveal quantitative and qualitative differences in the CD4(+) T cell response to a...Continue Reading

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