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gpnmb

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Official Full Name
glycoprotein (transmembrane) nmb
Background
Transmembrane glycoprotein NMB is a protein that in humans is encoded by the GPNMB gene. The mouse and rat orthologues of GPNMB are known as DC-HIL and Osteoactivin (OA), respectively. Two transcript variants encoding 560 and 572 amino acid isoforms have been characterized for this gene in humans. GPNMB is a type I transmembrane glycoprotein which shows homology to the pmel17 precursor, a melanocyte-specific protein. GPNMB has been reported to be expressed in various cell types, including: melanocytes, osteoclasts, osteoblasts, dendritic cells, and it is overexpressed in various cancer types. In melanocytic cells and osteoclasts the GPNMB gene is transcritionally regulated by Microphthalmia-associated transcription factor. In osteoblast progenitor cells, Osteoactivin works as a positive regulator of osteoblast differentiation during later stages of matrix maturation and mineralization that is mediated at least in part by BMP-2 in a SMAD1 dependent manner to promote osteoblast differentiation. In addition, using a rat fracture model, Osteoactivin (OA) enhances the repairing process in bone fracture, demonstrated by its high expression during chondrogenesis (soft callus) and osteogenesis (hard callus) compared to the intact femurs that is why Osteoactivin (OA) could be a novel therapeutic agent used to treat generalized osteoporosis or localized osteopenia during fracture repair by stimulating bone growth and regeneration. Similarly, Osteoactivin expression increases during osteoclast differentiation and it is functionally implicated in this process, possibly by promoting the fusion of osteoclast progenitor cells.
Synonyms
GPNMB; HGFIN; NMB; glycoprotein (transmembrane) nmb; dendritic cell-associated heparin sulfate proteoglycan-dependent integrin ligand; dendritic cell-associated transmembrane protein; iris pigment dispersion; osteoactivin; transmembrane glycoprotein NMB; glycoprotein NMB; glycoprotein nmb like protein; transmembrane glycoprotein; glycoprotein nmb-like protein; transmembrane glycoprotein HGFIN; ipd; Dchil; DC-HIL

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