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The effect of 1,25(OH)2D3 on alkaline phosphatase in osteoblastic osteosarcoma cells. 1982

R J Majeska, and G A Rodan

The effects of 1,25-dihydroxyvitamin D3 on growth, cell protein, and alkaline phosphatase were examined in cultures of a clonal osteoblast-like rat osteosarcoma cell line at different stages of phenotypic maturation, defined by the level of alkaline phosphatase activity. In "immature" cultures with low alkaline phosphatase specific activity, 1,25-dihydroxyvitamin D3 at 10(-8)-10(-7) M inhibited cell growth and elevated alkaline phosphatase activity; lower hormone concentrations had no effect. In cultures with higher alkaline phosphatase activity, the hormone had biphasic effects: at concentrations of 10(-8)-10(-7) M, 1,25-dihydroxyvitamin D3 inhibited growth and elevated alkaline phosphatase and total cell protein; however, lower hormone concentrations (10(-10) and 10(-9) M) reduced alkaline phosphatase activity. This effect was more pronounced in more "mature" cultures where half-maximum inhibition of alkaline phosphatase activity occurred near 10(-11) M. At this stage, the hormone caused a small increase in cell number. The data suggest that 1,25-dihydroxyvitamin D3 exerts differential effects on skeletal cells depending on their state of growth or maturation. This finding may offer new insights into the effects of 1,25-dihydroxyvitamin D3 on bone and may help resolve apparently conflicting experimental findings on the effects of the hormone on osteoblast-like cells in culture.

UI MeSH Term Description Entries
D007700 Kinetics The rate dynamics in chemical or physical systems.
D001859 Bone Neoplasms Tumors or cancer located in bone tissue or specific BONES. Bone Cancer,Cancer of Bone,Cancer of the Bone,Neoplasms, Bone,Bone Neoplasm,Neoplasm, Bone
D002117 Calcitriol The physiologically active form of vitamin D. It is formed primarily in the kidney by enzymatic hydroxylation of 25-hydroxycholecalciferol (CALCIFEDIOL). Its production is stimulated by low blood calcium levels and parathyroid hormone. Calcitriol increases intestinal absorption of calcium and phosphorus, and in concert with parathyroid hormone increases bone resorption. 1 alpha,25-Dihydroxycholecalciferol,1 alpha,25-Dihydroxyvitamin D3,1, 25-(OH)2D3,1,25(OH)2D3,1,25-Dihydroxycholecalciferol,1,25-Dihydroxyvitamin D3,1 alpha, 25-dihydroxy-20-epi-Vitamin D3,1,25(OH)2-20epi-D3,1,25-dihydroxy-20-epi-Vitamin D3,20-epi-1alpha,25-dihydroxycholecaliferol,Bocatriol,Calcijex,Calcitriol KyraMed,Calcitriol-Nefro,Decostriol,MC-1288,MC1288,Osteotriol,Renatriol,Rocaltrol,Silkis,Sitriol,Soltriol,Tirocal,1 alpha,25 Dihydroxyvitamin D3,1,25 Dihydroxycholecalciferol,1,25 Dihydroxyvitamin D3,1,25 dihydroxy 20 epi Vitamin D3,Calcitriol Nefro,D3, 1 alpha,25-Dihydroxyvitamin,D3, 1,25-Dihydroxyvitamin,D3, 1,25-dihydroxy-20-epi-Vitamin,KyraMed, Calcitriol,MC 1288
D002455 Cell Division The fission of a CELL. It includes CYTOKINESIS, when the CYTOPLASM of a cell is divided, and CELL NUCLEUS DIVISION. M Phase,Cell Division Phase,Cell Divisions,Division Phase, Cell,Division, Cell,Divisions, Cell,M Phases,Phase, Cell Division,Phase, M,Phases, M
D002460 Cell Line Established cell cultures that have the potential to propagate indefinitely. Cell Lines,Line, Cell,Lines, Cell
D000469 Alkaline Phosphatase An enzyme that catalyzes the conversion of an orthophosphoric monoester and water to an alcohol and orthophosphate. EC 3.1.3.1.
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D012513 Sarcoma, Experimental Experimentally induced neoplasms of CONNECTIVE TISSUE in animals to provide a model for studying human SARCOMA. EHS Tumor,Sarcoma, Engelbreth-Holm-Swarm,Sarcoma, Jensen,Experimental Sarcoma,Experimental Sarcomas,Sarcomas, Experimental,Engelbreth-Holm-Swarm Sarcoma,Jensen Sarcoma,Sarcoma, Engelbreth Holm Swarm,Tumor, EHS
D012516 Osteosarcoma A sarcoma originating in bone-forming cells, affecting the ends of long bones. It is the most common and most malignant of sarcomas of the bones, and occurs chiefly among 10- to 25-year-old youths. (From Stedman, 25th ed) Sarcoma, Osteogenic,Osteogenic Sarcoma,Osteosarcoma Tumor,Osteogenic Sarcomas,Osteosarcoma Tumors,Osteosarcomas,Sarcomas, Osteogenic,Tumor, Osteosarcoma,Tumors, Osteosarcoma
D051381 Rats The common name for the genus Rattus. Rattus,Rats, Laboratory,Rats, Norway,Rattus norvegicus,Laboratory Rat,Laboratory Rats,Norway Rat,Norway Rats,Rat,Rat, Laboratory,Rat, Norway,norvegicus, Rattus

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