The Journal of Experimental Medicine
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Published online 27 March 2000.
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© The Rockefeller University Press, 0022-1007/2000/4/1117/ $5.00
The Journal of Experimental Medicine, Volume 191, Number 7, April 3, 2000 1117-1126


Original Article

The Cysteine-rich Domain of the Macrophage Mannose Receptor Is a Multispecific Lectin That Recognizes Chondroitin Sulfates A and B and Sulfated Oligosaccharides of Blood Group Lewisa and Lewisx Types in Addition to the Sulfated N-Glycans of Lutropin

Christine Leteuxa, Wengang Chaia, R. Wendy Lovelessa, Chun-Ting Yuenb, Lars Uhlin-Hansenc, Yves Combarnousd, Mila Jankovice, Svetlana C. Marice, Ziva Misulovine,f, Michel C. Nussenzweige,f, and Ten Feizia
a The Glycosciences Laboratory, Imperial College School of Medicine, Northwick Park Hospital, Harrow HA1 3UJ, United Kingdom
b Laboratory of Molecular Structure, National Institute for Biological Standards and Control, Hertfordshire EN6 3QG, United Kingdom
c Department of Biochemistry, Institute of Medical Biology, University of Tromsø, N-9037 Tromsø, Norway
d Institut National de la Recherche Agronomique, Unit 1291, Station Physiologie de la Reproduction des Mammifères Domestiques, 37380 Nouzilly, France
e Department of Molecular Immunology, The Rockefeller University, New York, New York 10021-6399
f The Howard Hughes Medical Institute, The Rockefeller University, New York, New York 10021-6399

Correspondence to: Ten Feizi, The Glycosciences Laboratory, Imperial College School of Medicine, Northwick Park Hospital, Watford Road, Harrow, Middlesex HA1 3UJ, UK. Tel:44-20-8869-3460 Fax:44-20-8869-3455 E-mail:t.feizi{at}ic.ac.uk.

The mannose receptor (MR) is an endocytic protein on macrophages and dendritic cells, as well as on hepatic endothelial, kidney mesangial, tracheal smooth muscle, and retinal pigment epithelial cells. The extracellular portion contains two types of carbohydrate-recognition domain (CRD): eight membrane-proximal C-type CRDs and a membrane-distal cysteine-rich domain (Cys-MR). The former bind mannose-, N-acetylglucosamine-, and fucose-terminating oligosaccharides, and may be important in innate immunity towards microbial pathogens, and in antigen trapping for processing and presentation in adaptive immunity. Cys-MR binds to the sulfated carbohydrate chains of pituitary hormones and may have a role in hormonal clearance. A second feature of Cys-MR is binding to macrophages in marginal zones of the spleen, and to B cell areas in germinal centers which may help direct MR-bearing cells toward germinal centers during the immune response. Here we describe two novel classes of carbohydrate ligand for Cys-MR: chondroitin-4 sulfate chains of the type found on proteoglycans produced by cells of the immune system, and sulfated blood group chains. We further demonstrate that Cys-MR interacts with cells in the spleen via the binding site for sulfated carbohydrates. Our data suggest that the three classes of sulfated carbohydrate ligands may variously regulate the trafficking and function of MR-bearing cells.

Key Words: chondroitin sulfate, cysteine-rich domain, lutropin (luteinizing hormone), macrophage receptor, sulfo-Lewisa/x


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