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Institute of Molecular Medicine and Experimental Immunology (IMMEI), Friedrich-Wilhelms-Universität, Bonn, Germany
The mannose receptor (MR) has been implicated in the recognition and clearance of microorganisms and serum glycoproteins. Its endocytic function has been studied extensively using macrophages, although it is expressed by a variety of cell types, including dendritic cells (DC). In this study, we investigated its role in Ag presentation by DC using MR–/– mice. Uptake of the model Ag, soluble OVA, by bone marrow-derived DC and in vitro activation of OVA-specific CD8 T cells (OT-I cells) strictly depended on the MR. In vivo, MR deficiency impaired endocytosis of soluble OVA by DC and concomitant OT-I cell activation. No alterations in the DC subtype composition in MR–/– mice were accountable. Uptake of cell-associated OVA was unaffected by MR deficiency, resulting in unchanged activation of OT-I cells. These findings demonstrate that DC use the MR for endocytosis of a particular Ag type intended for cross-presentation.
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