CD31 (platelet endothelial cell adhesion molecule-1, PECAM-1) is an inhibitory coreceptor involved in regulation of T cell and B cell signaling by a dual immunoreceptor tyrosine-based inhibitory motif (ITIM) that upon associated kinases-mediated phosphorylation provide docking sites for protein-tyrosine phosphatases. CD31 is expressed ubiquitously within the vascular compartment and is located mainly at junctions between adjacent cells. The N-terminal Ig-like domain of CD31 is responsible for its homophilic binding, which plays an important role in cell-cell interactions. Further, CD31 is a multifunctional molecule with diverse roles in modulation of integrin-mediated cell adhesion, transendothelial migration, angiogenesis, apoptosis, negative regulation of immunoreceptor signaling, autoimmunity, macrophage phagocytosis, IgE-mediated anaphylaxis and thrombosis. CD31 is one of key regulatory molecules in the vascular system. CD31 induces susceptibility to atherosclerosis and this cell adhesion molecule is required for leukocyte migration under most inflammatory conditions. Antibodies to CD31 is of value in the study of benign and malignant vascular tumors.
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Protein Aliases: adhesion molecule; CD31; CD31 antigen; CD31/EndoCAM; EndoCAM; GPIIA'; PECA1; PECAM-1; Platelet endothelial cell adhesion molecule; platelet/endothelial cell adhesion molecule 1
Gene Aliases: CD31; CD31/EndoCAM; endoCAM; GPIIA'; PECA1; PECAM-1; PECAM1
UniProt ID: (Human) P16284
Entrez Gene ID: (Human) 5175
Molecular Function: cell adhesion molecule