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CD8(+) T cell responses have been shown to be regulated by dendritic cells (DCs) and CD4(+) T cells, leading to the tenet that CD8(+) T cells play a passive role in their own differentiation. In contrast, by using a DNA vaccination model, to separate the events of vaccination from those of CD8(+) T cell priming, we demonstrate that CD8(+) T cells, themselves, actively limit their own memory potential through CD8(+) T cell-derived IFN-γ-dependent modification of the IL-12/IL-15Rα axis on DCs. Such CD8(+) T cell-driven cytokine alterations result in increased T-bet and decreased Bcl-2 expression, and thus decreased memory progenitor formation. These results identify an unrecognized role for CD8(+) T cells in the regulation of their own effector differentiation fate and a previously uncharacterized relationship between the balance of inflammation and memory formation.

CD8+ T Cells Sabotage Their Own Memory Potential through IFN-γ–Dependent Modification of the IL-12/IL-15 Receptor α Axis on Dendritic Cells