A fixed spatial structure of CD8+ T cells in tissue during chronic HSV-2 infection

JT Schiffer, DA Swan, P Roychoudhury… - The Journal of …, 2018 - journals.aai.org
The Journal of Immunology, 2018journals.aai.org
Tissue-resident CD8+ T cells (T rm) can rapidly eliminate virally infected cells, but their
heterogeneous spatial distribution may leave gaps in protection within tissues. Although T
rm patrol prior sites of viral replication, murine studies suggest they do not redistribute to
adjacent uninfected sites to provide wider protection. We perform mathematical modeling of
HSV-2 shedding in Homo sapiens and predict that infection does not induce enough T rm in
many genital tract regions to eliminate shedding; a strict spatial distribution pattern of …
Abstract
Tissue-resident CD8+ T cells (T rm) can rapidly eliminate virally infected cells, but their heterogeneous spatial distribution may leave gaps in protection within tissues. Although T rm patrol prior sites of viral replication, murine studies suggest they do not redistribute to adjacent uninfected sites to provide wider protection. We perform mathematical modeling of HSV-2 shedding in Homo sapiens and predict that infection does not induce enough T rm in many genital tract regions to eliminate shedding; a strict spatial distribution pattern of mucosal CD8+ T cell density is maintained throughout chronic infection, and trafficking of T rm across wide genital tract areas is unlikely. These predictions are confirmed with spatial analysis of CD8+ T cell distribution in histopathologic specimens from human genital biopsies. Further simulations predict that the key mechanistic correlate of protection following therapeutic HSV-2 vaccination would be an increase in total T rm rather than spatial reassortment of these cells. The fixed spatial structure of T rm induced by HSV-2 is sufficient for rapid elimination of infected cells but only in a portion of genital tract microregions.
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