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During priming, CD8(+) T lymphocytes can induce robust maturation of dendritic cells (DCs) in a CD40-independent manner by secreting licensing factor(s). In this study, we isolate this so-far elusive licensing factor and identify it, surprisingly, as GM-CSF. This provides a new face for an old factor with a well-known supporting role in DC development and recruitment. Signaling through the GM-CSFR in ex vivo-purified DCs upregulated the expression of costimulatory molecules more efficiently than did any tested TLR agonist and provided a positive feedback loop in the stimulation of CD8(+) T cell proliferation. Combined with a variety of microbial stimuli, GM-CSF supports the formation of potent "effector" DCs capable of secreting a variety of proinflammatory cytokines that guide the differentiation of T cells during the immune response.

Cutting Edge: Granulocyte-Macrophage Colony-Stimulating Factor Is the Major CD8+ T Cell-Derived Licensing Factor for Dendritic Cell Activation