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Neuropilin-1 definition: Dimeric cell surface receptor involved in angiogenesis (NEOVASCULARIZATION, PHYSIOLOGICAL) and axonal guidance. Neuropilin-1 is a 140-kDa transmembrane protein that binds CLASS 3 SEMAPHORINS, and several other growth factors. Neuropilin-1 forms complexes with plexins or VEGF RECEPTORS, and binding affinity and specificity are determined by the composition of the neuropilin dimer and the identity of other receptors complexed with it. Neuropilin-1 is expressed in distinct patterns during neural development, complementary to those described for NEUROPILIN-2.
Neuropilin 1 definition: Encoded by human NRP1 Gene (Neuropilin Family), Neuropilin 1 contains 1 MAM, 2 F5/8 type C, and 2 CUB domains. Found in embryonic nervous system, and adult heart, placenta lung, liver, skeletal muscle, kidney, and pancreas, type I membrane-bound 923-aa 103-kDa (precursor) isoform 1, expressed by blood vessels, acts as a receptor in cardiovascular development, angiogenesis, formation of neuronal circuits, and organogenesis. Binding to semaphorin 3A, PLGF-2, VEGF-165, and VEGF-B, Isoform 1 appears to mediate chemorepulsion by semaphorins, to increase VEGF-165 binding to KDR, and to regulate VEGF-induced angiogenesis. Expressed in hepatocytes and kidney distal/proximal tubules, secreted 644-aa isoform 2 may bind semaphorins and induce apoptosis by sequestering VEGF-165; it has an adverse effect on blood vessel integrity. Expression of isoforms 1 and 2 does not seem to overlap. (NCI)
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