{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nTNFRSF11B encodes osteoprotegerin (OPG), a secreted member of the tumor necrosis factor receptor superfamily that plays a central role in bone homeostasis. Acting as a decoy receptor, OPG binds receptor activator of nuclear factor‑kappaB ligand (RANKL) to prevent its interaction with RANK, thereby inhibiting osteoclast differentiation, activation, and survival. This molecular “brake” on osteoclastogenesis is essential to maintain proper bone remodeling and skeletal integrity. Genetic studies and clinical observations have linked alterations in OPG expression and promoter polymorphisms to reduced bone mineral density, increased fracture risk, and diseases such as juvenile Paget’s disease where OPG deficiency has been implicated."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "11"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its established role in bone metabolism, OPG is increasingly recognized as a critical mediator in vascular and immune biology. Studies have demonstrated that OPG is expressed by vascular smooth muscle cells and endothelial cells, where it participates in the regulation of vascular calcification by counteracting osteogenic signals. Circulating OPG levels are modulated by inflammatory cytokines and growth factors, and dysregulation of OPG has been associated with a range of extra‐skeletal conditions including atherosclerosis, chronic obstructive pulmonary disease, and type 2 diabetes. These findings underscore OPG’s importance as a protective factor against arterial calcification and as a modulatory component in endothelial cell survival, inflammatory responses, and overall vascular homeostasis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "12", "end_ref": "27"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nOPG’s multifaceted functions further extend into cancer biology and metabolic regulation. In several tumor models, including hormone‐refractory prostate cancer and multiple myeloma, autocrine or paracrine production of OPG by tumor cells has been shown to confer a survival advantage by binding pro‐apoptotic ligands such as TRAIL, thereby protecting cells from apoptosis. In these settings, OPG not only influences bone destruction associated with metastases but also modulates cell migration and angiogenesis. Additionally, emerging studies indicate that OPG may stimulate pancreatic β‑cell replication and contribute to endothelial cell protection, linking TNFRSF11B to metabolic disorders and providing novel avenues for therapeutic intervention in conditions as diverse as osteoporosis, cardiovascular disease, diabetes, and cancer."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "28", "end_ref": "37"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Brendan F Boyce, Lianping Xing "}, {"type": "b", "children": [{"type": "t", "text": "Biology of RANK, RANKL, and osteoprotegerin."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Arthritis Res Ther (2007)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1186/ar2165"}], "href": "https://doi.org/10.1186/ar2165"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17634140"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17634140"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "J B Richards, F Rivadeneira, M Inouye, et al. 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