Osteoprotegerin (OPG) is a secreted glycoprotein belonging to the TNF receptor (TNF-R) superfamily that functions as a decoy receptor for RANK-Ligand (RANKL/OPGL). Unlike other TNF-Rs, OPG lacks a membrane-anchoring hydrophobic domain and lacks any apparent cell-associated signaling capability. OPG secreted by osteoblasts competes with RANK (expressed on osteoblast precursors) for binding to RANKL, blocking osteoclastogenesis and increasing bone density.
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Regulatory Status |
RUO – Research Use Only |
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