The Journal of Experimental Medicine
Fluorescence In Vivo Endomicroscopy
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Published online 4 December 2000.
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© The Rockefeller University Press, 0022-1007/2000/12/1661/ $5.00
The Journal of Experimental Medicine, Volume 192, Number 11, December 4, 2000 1661-1668


Brief Definitive Report

Fas Engagement Induces the Maturation of Dendritic Cells (DCs), the Release of Interleukin (IL)-1ß, and the Production of Interferon {gamma} in the Absence of IL-12 during DC–T Cell Cognate Interaction: A New Role for Fas Ligand in Inflammatory Responses

Maria Rescignoa, Vincent Piguetb, Barbara Valzasinaa, Suzanne Lensc, Rudolf Zublerd, Lars Frenchb, Vincent Kindlerd, Jurg Tschoppc, and Paola Ricciardi-Castagnolia
a Department of Biotechnology and Bioscience, University of Milano-Bicocca, 20126 Milan, Italy
b Department of Dermatology, Hôspitaux Universitaires de Genéve, Département Hospitalo-Universitaire Romand de Dermatologie et Vénéréologie, CH-1211 Geneva, Switzerland
c Institut de Biochimie, University of Lausanne, CH-1066 Epalinges, Switzerland
d Division of Hematology, Hôspitaux Universitaires Vaudois et Genevois, CH-1211 Geneva, Switzerland

Correspondence to: Paola Ricciardi-Castagnoli, Department of Biotechnology and Bioscience, University of Milano-Bicocca, 20126 Milan, Italy. Tel:39-02-644-83559 Fax:39-02-644-83565 E-mail:paola.castagnoli{at}unimib.it.

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-1ß–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)-1ß and tumor necrosis factor {alpha}. Mature DCs, if exposed to FasL, produce even higher amounts of IL-1ß. Importantly, it is possible to reduce the production of IL-1ß 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.

Key Words: dendritic cells, Fas, interleukin 1ß, FLIP, interferon {gamma}


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