Sphingosine 1-phosphate induces chemotaxis of immature and modulates cytokine-release in mature human dendritic cells for emergence of Th2 immune responses

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
Marco IdzkoJohannes Norgauer

Abstract

Sphingosine 1-phosphate (S1P) is a potent extracellular lysolipid phosphoric acid mediator that is released after IgE-stimulation of mast cells. Here we investigated the biological activity and intracellular signaling of S1P on human dendritic cells (DC), which are specialized antigen presenting cells with the ability to migrate into peripheral tissues and lymph nodes, as well as control the activation of naive T cells. We show that immature and mature DC express the mRNA for different S1P receptors, such as endothelial differentiation gene (EDG)-1, EDG-3, EDG-5, and EDG-6. In immature DC, S1P stimulated pertussis toxin-sensitive Ca2+ increase actin-polymerization and chemotaxis. These responses were lost by DC matured with lipopolysaccharide. In maturing DC, however, S1P inhibited the secretion of tumor necrosis factor alpha and interleukin (IL)-12, whereas it enhanced secretion of IL-10. As a consequence, mature DC exposed to S1P showed a reduced and increased capacity to generate allogeneic Th1 and Th2 responses, respectively. In summary, our study implicates that S1P might regulate the trafficking of DC and ultimately favor Th2 lymphocyte-dominated immunity.

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