Glycobiology Advance Access originally published online on June 9, 2004
Glycobiology 2004 14(10):7C-12C; doi:10.1093/glycob/cwh109
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Glycobiology vol. 14 no. 10 © Oxford University Press 2004; all rights reserved.
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The mannose receptor fails to enhance processing and presentation of a glycoprotein antigen in transfected fibroblasts
Glycobiology Institute, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
Received on February 28, 2004; revised on June 3, 2004; accepted on June 4, 2004
One function proposed for the mannose receptor found on dendritic cells as well as on macrophages and hepatic endothelial cells is in enhancing uptake and processing of glycoprotein antigens for presentation by major histocompatibility complex (MHC) class II molecules. In this study, a direct assessment of the possible role of the mannose receptor in this process was made in the absence of other endocytic receptors that can internalize glycoproteins. Presentation of RNase A and B peptides was compared in transfected fibroblasts coexpressing the mannose receptor and MHC class II molecules. RNase B bears a high-mannose oligosaccharide and is a ligand for the mannose receptor, whereas RNase A is not glycosylated and is taken up by pinocytosis. Incubation of RNase A or B with the transfected cells resulted in identical stimulation of ribonuclease-specific T cells, indicating that endocytosis of the glycosylated protein by the mannose receptor does not enhance presentation of this antigen. The postulated role of the mannose receptor in presentation of glycoprotein-derived antigen is reevaluated in light of these results.
1 To whom correspondence should be addressed; e-mail: mt{at}glycob.ox.ac
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