No change in bone-specific alkaline phosphatase activities in cultured rat osteoblastic cells under L-ascorbate and beta-glycerophosphate-induced mineralization.
Mineralization occurred both in fetal rat calvarial cells and UMR 106 osteoblastic cells when they were cultured in medium containing L-ascorbate and beta-glycerophosphate as evidenced by von Kóssa staining as well as deposition of calcium ions and inorganic phosphate in the cells. When compared with corresponding non-mineralized cell cultures, both the mineralized cultures of calvarial cells and UMR 106 cells did not exhibit any change in intracellular bone-specific alkaline phosphatase activities which were measured by wheatgerm lectin precipitation method. Our results support the hypothesis that mineralization may not exert any direct negative feedback on matrix protein synthesis in osteoblasts during bone formation.
Chak
C W
CW
Department of Biochemistry, Faculty of Medicine, Chinese University of Hong Kong, Shatin.
Lee
K M
KM
Leung
K S
KS
Fung
K P
KP
D000469:Alkaline Phosphatase / Q000378:metabolism*; D000818:Animals; D001205:Ascorbic Acid / Q000494:pharmacology*; D002113:Calcification, Physiologic / Q000187:drug effects*; D002118:Calcium / Q000032:analysis; D003470:Culture Media / Q000494:pharmacology; D005333:Fetus / Q000166:cytology; D005994:Glycerophosphates / Q000494:pharmacology*; D010006:Osteoblasts / Q000737:chemistry / Q000166:cytology / Q000201:enzymology*; D012516:Osteosarcoma; D010710:Phosphates / Q000032:analysis; D051381:Rats; D012886:Skull / Q000737:chemistry / Q000166:cytology; D014407:Tumor Cells, Cultured / Q000737:chemistry / Q000201:enzymology
D003470:Culture Media; D005994:Glycerophosphates; D010710:Phosphates; D000469:Alkaline Phosphatase; D001205:Ascorbic Acid; D002118:Calcium; C031463:beta-glycerophosphoric acid