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Ligation of the Fas (CD95) receptor leads to an apoptotic death signal in T cells, B cells, and macrophages. However, human CD34(+)-derived dendritic cells (DCs) and mouse DCs, regardless of their maturation state, are not susceptible to Fas-induced cell death. This resistance correlates with the constitutive expression of the Fas-associated death domain-like IL-1beta-converting enzyme (FLICE)-inhibitory protein (FLIP) ligand. We demonstrate a new role of Fas in DC physiology. Engagement of Fas on immature DCs by Fas ligand (FasL) or by anti-Fas antibodies induces the phenotypical and functional maturation of primary DCs. Fas-activated DCs upregulate the expression of the major histocompatibility complex class II, B7, and DC-lysosome-associated membrane protein (DC-LAMP) molecules and secrete proinflammatory cytokines, in particular interleukin (IL)-1beta and tumor necrosis factor alpha. Mature DCs, if exposed to FasL, produce even higher amounts of IL-1beta. Importantly, it is possible to reduce the production of IL-1beta and interferon (IFN)-gamma during DC-T cell interaction by blocking the coupling of Fas-FasL with a Fas competitor. Finally, during cognate DC-T cell recognition, IL-12 (p70) could not be detected at early or late time points, indicating that Fas-induced, IFN-gamma secretion is independent of IL-12.

the journal of experimental medicine/the journal of experimental medicine

FAS Engagement Induces the Maturation of Dendritic Cells (Dcs), the Release of Interleukin (Il)-1β, and the Production of Interferon γ in the Absence of IL-12 during Dc–T Cell Cognate Interaction