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Dendritic cells (DC) represent a rather heterogeneous cell population with regard to morphology, phenotype, and function and, like most cells of the immune system, are subjected to a continuous renewal process. CD103(+) (integrin alpha(E)) DC have been identified as a major mucosal DC subset involved in the induction of tissue-specific homing molecules on T cells, but little is known about progenitors able to replenish this DC subset. Herein we report that lineage (lin)(-)CX(3)CR1(+)c-kit(+) (GFP(+)c-kit(+)) bone marrow cells can differentiate to either CD11c(+)CD103(-) or CD11c(+)CD103(+) DC in vitro and in vivo. Gene expression as well as functional assays reveal distinct phenotypical and functional properties of both subsets generated in vitro. CD103(-) DC exhibit enhanced phagocytosis and respond to LPS stimulation by secreting proinflammatory cytokines, whereas CD103(+) DC express high levels of costimulatory molecules and efficiently induce allogeneic T cell proliferation. Following adoptive transfer of GFP(+)c-kit(+) bone marrow cells to irradiated recipients undergoing allergic lung inflammation, we identified donor-derived CD103(+) DC in lung and the lung-draining bronchial lymph node. Collectively, these data indicate that GFP(+)c-kit(+) cells contribute to the replenishment of CD103(+) DC in lymphoid and nonlymphoid organs.

CX3CR1+c-kit+ Bone Marrow Cells Give Rise to CD103+ and CD103− Dendritic Cells with Distinct Functional Properties