{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nSclerostin—the protein product of the SOST gene—is a potent secreted inhibitor of bone formation primarily produced by osteocytes embedded within the mineralized matrix. It functions by antagonizing key osteogenic signals, notably the bone morphogenetic protein (BMP) and canonical Wnt pathways, thereby restraining osteoblast differentiation and activity. Genetic conditions such as sclerosteosis and Van Buchem disease illustrate that absent or diminished SOST expression leads to abnormally high bone mass, underscoring its central role in bone homeostasis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "5"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nThe expression of SOST and its protein product is dynamically regulated by a range of mechanical, hormonal, and environmental cues. Mechanical loading, for example, reduces sclerostin levels, thereby unleashing Wnt signaling to promote bone formation; conversely, conditions such as mechanical unloading, hypoxia, and epigenetic modification (e.g. altered DNA methylation) can modulate its synthesis. Estrogen signaling appears particularly important, with evidence showing that estrogen—via specific estrogen receptor subtypes—downregulates SOST expression, a mechanism that may contribute to the regulation of skeletal turnover."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "12"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nClinically, aberrations in sclerostin regulation are associated with diverse skeletal and systemic pathologies. In high‐bone‐mass disorders such as sclerosteosis and Van Buchem disease, mutations or deletions affecting SOST result in unrestrained bone formation, while in conditions such as diabetes mellitus, chronic kidney disease, and rheumatoid arthritis, altered circulating sclerostin levels correlate with impaired bone turnover, increased fracture risk, and even vascular calcification. Population studies have further demonstrated that serum sclerostin increases with age and differs by sex, suggesting that SOST may serve as both a biomarker and a potential therapeutic target in metabolic bone disease and vascular disorders."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "13", "end_ref": "31"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAt the molecular level, sclerostin interacts with several components of the Wnt signaling machinery, including the low density lipoprotein receptor–related proteins (LRP4, LRP5, and LRP6) and the Wnt inhibitor Dickkopf-1 (DKK1), to finely tune osteoblast function. It also exerts influence over osteoclastogenesis through modulation of the RANKL/OPG ratio, and may regulate mineral remodeling by promoting osteocytic osteolysis via the upregulation of acid-base regulatory enzymes and proteolytic factors. These interactions provide a mechanistic rationale for both the genetic associations observed in bone mineral density studies and the development of novel anabolic or anti‐resorptive therapies targeting sclerostin."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "32", "end_ref": "43"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nGenetic studies and clinical trials have begun to capitalize on insights into the SOST/sclerostin pathway, exploring its potential as a therapeutic target for osteoporosis and other bone and mineral disorders. Genome‐wide association analyses have identified loci near the SOST gene that correlate with bone density, and preclinical as well as early clinical studies employing monoclonal antibodies against sclerostin have shown promising anabolic effects on the skeleton. However, the complexity of sclerostin’s role—ranging from protective functions during chronic inflammation to influences on vascular integrity—calls for cautious therapeutic targeting in diverse disease settings."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "44", "end_ref": "46"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "David G Winkler, May Kung Sutherland, James C Geoghegan, et al. 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