The Journal of Experimental Medicine
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Published 7 January 2002. doi:10.1084/jem.20001858
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© Rockefeller University Press, 0022-1007/2002/1/99/ $5.00
The Journal of Experimental Medicine, Volume 195, Number 1, January 7, 2002 99-111


Original Article

Oligosaccharides of Hyaluronan Activate Dendritic Cells via Toll-like Receptor 4

Christian Termeer1, Frauke Benedix1, Jonathon Sleeman2, Christina Fieber2, Ursula Voith1, Thomas Ahrens5, Kensuke Miyake4, Marina Freudenberg3, Christopher Galanos3 and Jan Christoph Simon1

1 Department of Dermatology, University of Freiburg, Freiburg D-79104, Germany
2 Institute for Genetics, Forschungszentrum Karlsruhe, Karlsruhe D-76021, Germany
3 Max-Planck Institute for Immunobiology, Freiburg D-79011, Germany
4 Division of Infectious Genetics, Department of Microbiology and Immunology, The Institute of Medical Science, University of Tokyo, Tokyo 108-8639, Japan
5 Department for Biophysical Chemistry, Biocenter Basel, Basel CH-4056, Switzerland

Address correspondence to C. Termeer, Dept. of Dermatology, University of Freiburg, Hauptstr. 7, D-79104 Freiburg, Germany. Phone: 49-761-270-6831; Fax: 49-761-270-6829; E-mail: Termeer{at}haut.ukl.uni-freiburg.de

Low molecular weight fragmentation products of the polysaccharide of Hyaluronic acid (sHA) produced during inflammation have been shown to be potent activators of immunocompetent cells such as dendritic cells (DCs) and macrophages. Here we report that sHA induces maturation of DCs via the Toll-like receptor (TLR)-4, a receptor complex associated with innate immunity and host defense against bacterial infection. Bone marrow–derived DCs from C3H/HeJ and C57BL/10ScCr mice carrying mutant TLR-4 alleles were nonresponsive to sHA-induced phenotypic and functional maturation. Conversely, DCs from TLR-2–deficient mice were still susceptible to sHA. In accordance, addition of an anti–TLR-4 mAb to human monocyte–derived DCs blocked sHA-induced tumor necrosis factor {alpha} production. Western blot analysis revealed that sHA treatment resulted in distinct phosphorylation of p38/p42/44 MAP-kinases and nuclear translocation of nuclear factor (NF)-{kappa}B, all components of the TLR-4 signaling pathway. Blockade of this pathway by specific inhibitors completely abrogated the sHA-induced DC maturation. Finally, intravenous injection of sHA-induced DC emigration from the skin and their phenotypic and functional maturation in the spleen, again depending on the expression of TLR-4. In conclusion, this is the first report that polysaccharide degradation products of the extracellular matrix produced during inflammation might serve as an endogenous ligand for the TLR-4 complex on DCs.

Key Words: extracellular matrix • glycosaminoglycans • dendritic cells • Hyaluronan • toll-like receptors


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