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Critical Reviews™ in Immunology
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ISSN Imprimir: 1040-8401
ISSN En Línea: 2162-6472

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Critical Reviews™ in Immunology

DOI: 10.1615/CritRevImmunol.v24.i3.20
14 pages

From Pattern Recognition Receptor to Regulator of Homeostasis: The Double-Faced Macrophage Mannose Receptor

Paola Allavena
Department of Immunology and Cell Biology, Mario Negri Institute, Via Eritrea, 62, 20157 Milan, Italy
Marcello Chieppa
Department of Immunology and Cell Biology, Mario Negri Institute, Via Eritrea, 62, 20157 Milan, Italy; and Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, NHI, Bethesda, MD, USA
Paolo Monti
Telethon-Juvenile Diabetes Research Foundation Center for β Cell Replacement, San Raffaele Scientific Institute, Via Olgettina 60 20132 Milan, Italy
Lorenzo Piemonti
Telethon-Juvenile Diabetes Research Foundation Center for β Cell Replacement, San Raffaele Scientific Institute, Via Olgettina 60 20132 Milan, Italy

SINOPSIS

The mannose receptor (MR) is an endocytic and phagocytic receptor belonging to the C-type lectin superfamily. A number of functions have been ascribed to this receptor, which is involved in innate and adaptive immune responses. The MR binds carbohydrate moieties on several pathogens, such as bacteria, fungi, parasites, and viruses, and, therefore, is considered a pattern recognition receptor (PRR). In addition, MR binds endogenous molecules and was originally described as a membrane-associated component binding lysosomal glycosidases in alveolar macrophages. Since its identification more than 25 years ago, many other endogenous ligands were described, including hormones, enzymes, cell membranes, extracellular matrix components, and normal as well as tumoral mucins. The MR is preferentially expressed on immune cells of myeloid lineage, especially subsets of dendritic cells (DC) and tissue macrophages. In addition to immune cells, specialized endothelial cells are also MR-positive. Increasing evidence shows that the MR is involved in the silent clearance of inflammatory molecules. In this review, we discuss current knowledge about the receptor and show that endogenous ligands activate an anti-inflammatory and tolerogenic program in DC and macrophages, thus reinforcing the hypothesis that the MR has an important role in the maintenance of homeostasis.


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