The Journal of Experimental Medicine
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Published online 23 December 2002 doi:10.1084/jem.20021229
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© Rockefeller University Press, 0022-1007/2003/1/7 $5.00
The Journal of Experimental Medicine, Volume 197, Number 1, 7-17

Mycobacteria Target DC-SIGN to Suppress Dendritic Cell Function

Teunis B.H. Geijtenbeek1, Sandra J. van Vliet1, Estella A. Koppel1, Marta Sanchez-Hernandez1, Christine M.J.E. Vandenbroucke-Grauls2, Ben Appelmelk2 and Yvette van Kooyk1

1 Department of Molecular Cell Biology, Vrije Universiteit Medical Center Amsterdam, 1081 BT Amsterdam, Netherlands
2 Department of Medical Microbiology, Vrije Universiteit Medical Center Amsterdam, 1081 BT Amsterdam, Netherlands

Address correspondence to T. Geijtenbeek, Department of Molecular Cell Biology, Free University Medical Center Amsterdam, v.d. Boechorststraat 7, 1081 BT Amsterdam, Netherlands. Phone: 31-20-4448080; Fax: 31-20-4448081; E-mail: T.Geijtenbeek.Cell{at}med.vu.nl

Mycobacterium tuberculosis represents a world-wide health risk and immunosuppression is a particular problem in M. tuberculosis infections. Although macrophages are primarily infected, dendritic cells (DCs) are important in inducing cellular immune responses against M. tuberculosis. We hypothesized that DCs represent a target for M. tuberculosis and that the observed immuno-suppression results from modulation of DC functions. We demonstrate that the DC-specific C-type lectin DC-SIGN is an important receptor on DCs that captures and internalizes intact Mycobacterium bovis bacillus Calmette-Guérin (BCG) through the mycobacterial cell wall component ManLAM. Antibodies against DC-SIGN block M. bovis BCG infection of DCs. ManLAM is also secreted by M. tuberculosis–infected macrophages and has been implicated as a virulence factor. Strikingly, ManLAM binding to DC-SIGN prevents mycobacteria- or LPS-induced DC maturation. Both mycobacteria and LPS induce DC maturation through Toll-like receptor (TLR) signaling, suggesting that DC-SIGN, upon binding of ManLAM, interferes with TLR-mediated signals. Blocking antibodies against DC-SIGN reverse the ManLAM-mediated immunosuppressive effects. Our results suggest that M. tuberculosis targets DC-SIGN both to infect DCs and to down-regulate DC-mediated immune responses. Moreover, we demonstrate that DC-SIGN has a broader pathogen recognition profile than previously shown, suggesting that DC-SIGN may represent a molecular target for clinical intervention in infections other than HIV-1.

Key Words: DC-SIGN • Toll-like receptors • Mycobacterium tuberculosis • ManLAM • immunosuppression


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