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Receptors, Polymeric Immunoglobulin
Polymeric Immunoglobulin Receptors | Poly-Ig Receptor | Polyimmunoglobulin Receptor | Polymeric Ig Receptor | Polymeric Immunoglobulin Receptor | Receptor, Polyimmunoglobulin | Receptor, Polymeric Ig | Ig Receptor, Polymeric | Poly Ig Receptor
Specialized Fc receptors (RECEPTORS, FC) for polymeric immunoglobulins, which mediate transcytosis of polymeric IMMUNOGLOBULIN A and IMMUNOGLOBULIN M into external secretions. They are found on the surfaces of epithelial cells and hepatocytes. After binding to IMMUNOGLOBULIN A, the receptor-ligand complex undergoes endocytosis, transport by vesicle, and secretion into the lumen by exocytosis. Before release, the part of the receptor (SECRETORY COMPONENT) that is bound to IMMUNOGLOBULIN A is proteolytically cleaved from its transmembrane tail. (From Rosen et al., The Dictionary of Immunology, 1989) |
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