Journal article

T Cell Help Amplifies Innate Signals in CD8( ) DCs for Optimal CD8( ) T Cell Priming

Marie Greyer, Paul G Whitney, Angus T Stock, Gayle M Davey, Christina Tebartz, Annabell Bachem, Justine D Mintern, Richard A Strugnell, Stephen J Turner, Thomas Gebhardt, Meredith O'Keeffe, William R Heath, Sammy Bedoui

CELL REPORTS | CELL PRESS | Published : 2016

Abstract

DCs often require stimulation from CD4(+) T cells to propagate CD8(+) T cell responses, but precisely how T cell help optimizes the priming capacity of DCs and why this appears to differ between varying types of CD8(+) T cell immunity remains unclear. We show that CD8(+) T cell priming upon HSV-1 skin infection depended on DCs receiving stimulation from both IFN-α/β and CD4(+) T cells to provide IL-15. This was not an additive effect but resulted from CD4(+) T cells amplifying DC production of IL-15 in response to IFN-α/β. We also observed that increased innate stimulation reversed the helper dependence of CD8(+) T cell priming and that the innate stimulus, rather than the CD4(+) T cells the..

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