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• W4226282956 endingPage "C990" @default.
• W4226282956 startingPage "C977" @default.
• W4226282956 abstract "A major cause of osteoporosis is impaired coupled bone formation. Mechanistically, both osteoclast-derived and bone-derived growth factors have been previously implicated. Here, we hypothesize that the release of bone calcium during osteoclastic bone resorption is essential for coupled bone formation. Osteoclastic resorption increases interstitial fluid calcium locally from the normal 1.8 mM up to 5 mM. MC3T3-E1 osteoprogenitor cells, cultured in a 3.6 mM calcium medium, demonstrated that calcium signaling stimulated osteogenic cell proliferation, differentiation, and migration. Calcium channel knockdown studies implicated calcium channels, Cav1.2, store-operated calcium entry (SOCE), and calcium-sensing receptor (CaSR) in regulating bone cell anabolic activities. MC3T3-E1 cells cultured in a 3.6 mM calcium medium expressed increased gene expression of Wnt signaling and growth factors platelet-derived growth factor (PDGF), vascular endothelial growth factor (VEGF), and bone morphogenic protein-2 (BMP 2). Our coupling model of bone formation, the receptor activator of nuclear factor-κΒ ligand (RANKL)-treated mouse calvaria, confirmed the role of calcium signaling in coupled bone formation by exhibiting increased gene expression for osterix and osteocalcin. Critically, dual immunocytochemistry showed that RANKL treatment increased osterix-positive cells and increased fluorescence intensity of Cav1.2 and CaSR protein expression per osterix-positive cell. The above data established that calcium released by osteoclasts contributed to the regulation of coupled bone formation. CRISPR/Cas-9 knockout of Cav1.2 in osteoprogenitor cells cultured in basal calcium medium caused a >80% decrease in the expression of downstream osteogenic genes, emphasizing the large magnitude of the effect of calcium signaling. Thus, calcium signaling is a major regulator of coupled bone formation." @default.
• W4226282956 created "2022-05-05" @default.
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• W4226282956 date "2022-05-01" @default.
• W4226282956 modified "2023-10-16" @default.
• W4226282956 title "Calcium released by osteoclastic resorption stimulates autocrine/paracrine activities in local osteogenic cells to promote coupled bone formation" @default.
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• W4226282956 doi "https://doi.org/10.1152/ajpcell.00413.2021" @default.
• W4226282956 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35385325" @default.

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