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• W2189256747 abstract "In the process of bone remodeling, mineral phase of bone is dissolved by osteoclasts, resulting in elevation of calcium concentration in micro-environment. This study was performed to explore the effect of high extracellular calcium (Ca 2+ e) on mineralized nodule formation and on the expression of progressive ankylosis (Ank), plasma cell membrane glycoprotein-1 (PC-1) and osteopontin by primary cultured mouse calvarial cells. Osteoblastic differentiation and mineralized nodule formation was induced by culture of mouse calvarial cells in osteoblast differentiation medium containing ascorbic acid and β-glycerophosphate. Although Ank, PC-1 and osteopontin are well known inhibitors of mineralization, expression of these genes were induced at the later stage of osteoblast differentiation during when expression of osteocalcin, a late marker gene of osteoblast differentiation, was induced and mineralization was actively progressing. High Ca 2+ e (10 mM) treatment highly enhanced mRNA expression of Ank, PC-1 and osteopontin in the late stage of osteoblast differentiation but not in the early stage. Inhibition of p44/42 MAPK activation but not that of protein kinase C suppressed high Ca 2+ e-induced expression of Ank, PC-1 and osteopontin. When high Ca 2+ e (5 mM or 10 mM) was present in culture medium during when mineral deposition was actively progressing, matrix calcifiation was significantly increased by high Ca 2+ e. This stimulatory effect was abolished by pyrophosphate (5 mM) or levamisole (0.1-0.5 mM), an alkaline phosphatase inhibitor. In addition, probenecid (2 mM), an inhibitor of Ank, suppressed matrix calcification in both control and high Ca 2+ e-treated group, suggesting the possible role of Ank in matrix calcification by osteoblasts. Taken together, these results showed that high Ca 2+ e stimulates expression of Ank, PC-1 and osteopontin as well as matrix calcification in late differentiation stage of osteoblasts and that p44/42 MAPK activation is involved in high Ca 2+ einduced expression of Ank, PC-1 and osteopontin." @default.
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• W2189256747 date "2008-01-01" @default.
• W2189256747 modified "2023-09-28" @default.
• W2189256747 title "High Extracellular Calcium Increased Expression of Ank, PC-1 andOsteopontin in Mouse Calvarial Cells" @default.
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