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- W1656135599 abstract "CD4(+) T cells promote effective CD8(+) T cell-mediated immunity, but the timing and mechanistic details of such help remain controversial. Furthermore, the extent to which innate stimuli act independently of help in enhancing CD8(+) T cell responses is also unresolved. Using a noninfectious vaccine model in immunocompetent mice, we show that even in the presence of innate stimuli, CD4(+) T cell help early after priming is required for generating an optimal pool of functional memory CD8(+) T cells. CD4(+) T cell help increased the size of a previously unreported population of IL-6Ralpha(high)IL-7Ralpha(high) prememory CD8(+) T cells shortly after priming that showed a survival advantage in vivo and contributed to the majority of functional memory CD8(+) T cells after the contraction phase. In accord with our recent demonstration of chemokine-guided recruitment of naive CD8(+) T cells to sites of CD4(+) T cell-dendritic cell interactions, the generation of IL-6Ralpha(high)IL-7Ralpha(high) prememory as well as functional memory CD8(+) T cells depended on the early postvaccination action of the inflammatory chemokines CCL3 and CCL4. Together, these findings support a model of CD8(+) T cell memory cell differentiation involving the delivery of key signals early in the priming process based on chemokine-guided attraction of naive CD8(+) T cells to sites of Ag-driven interactions between TLR-activated dendritic cells and CD4(+) T cells. They also reveal that elevated IL-6Ralpha expression by a subset of CD8(+) T cells represents an early imprint of CD4(+) T cell helper function that actively contributes to the survival of activated CD8(+) T cells." @default.
- W1656135599 created "2016-06-24" @default.
- W1656135599 creator A5013178279 @default.
- W1656135599 creator A5088777789 @default.
- W1656135599 date "2007-01-15" @default.
- W1656135599 modified "2023-10-16" @default.
- W1656135599 title "Chemokine-Guided CD4+ T Cell Help Enhances Generation of IL-6RαhighIL-7Rαhigh Prememory CD8+ T Cells" @default.
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- W1656135599 doi "https://doi.org/10.4049/jimmunol.178.2.778" @default.
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