The Journal of Experimental Medicine
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Published online 24 February 2003 doi:10.1084/jem.20021859
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© Rockefeller University Press, 0022-1007/2003/3/585 $5.00
The Journal of Experimental Medicine, Volume 197, Number 5, 585-599

Compartmentalized Production of CCL17 In Vivo : Strong Inducibility in Peripheral Dendritic Cells Contrasts Selective Absence from the Spleen



Judith Alferink1,2, Ivo Lieberam4, Wolfgang Reindl1,2, Andrea Behrens1,2, Susanne Weiß1,2, Norbert Hüser1,3, Klaus Gerauer1,3, Ralf Ross5, Angelika B. Reske-Kunz5, Parviz Ahmad-Nejad1, Hermann Wagner1 and Irmgard Förster1,2

1 Institute for Medical Microbiology, Immunology and Hygiene, Technical University of Munich, D-81675 Munich, Germany
2 Department of Internal Medicine II, Technical University of Munich, D-81675 Munich, Germany
3 Department of Surgery, Technical University of Munich, D-81675 Munich, Germany
4 Institute for Genetics, University of Cologne, D-50931 Cologne, Germany
5 Clinical Research Unit Allergology, Department of Dermatology, Johannes Gutenberg-University of Mainz, D-55101 Mainz, Germany

Address correspondence to Irmgard Förster, Institute for Medical Microbiology, Immunology and Hygiene, Trogerstr. 4b, D-81675 München, Germany. Phone: 49-89-4140-7454; Fax: 49-89-4140-7461; E-mail: I.Foerster{at}lrz.tu-muenchen.de

Dendritic cells (DCs)* fulfill an important regulatory function at the interface of the innate and adaptive immune system. The thymus and activation-regulated chemokine (TARC/CCL17) is produced by DCs and facilitates the attraction of activated T cells. Using a fluorescence-based in vivo reporter system, we show that CCL17 expression in mice is found in activated Langerhans cells and mature DCs located in various lymphoid and nonlymphoid organs, and is up-regulated after stimulation with Toll-like receptor ligands. DCs expressing CCL17 belong to the CD11b+CD8-Dec205+ DC subset, including the myeloid-related DCs located in the subepithelial dome of Peyer's patches. CCL17-deficient mice mount diminished T cell–dependent contact hypersensitivity responses and display a deficiency in rejection of allogeneic organ transplants. In contrast to lymphoid organs located at external barriers of the skin and mucosa, CCL17 is not expressed in the spleen, even after systemic microbial challenge or after in vitro stimulation. These findings indicate that CCL17 production is a hallmark of local DC stimulation in peripheral organs but is absent from the spleen as a filter of blood-borne antigens.

Key Words: CCL17/TARC • dendritic cells • transplant rejection • contact hypersensitivity • Toll-like receptors


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