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  • Title: Induction of osteoblastic cell differentiation by forskolin. Stimulation of cyclic AMP production and alkaline phosphatase activity.
    Author: Hakeda Y, Ikeda E, Kurihara N, Nakatani Y, Maeda N, Kumegawa M.
    Journal: Biochim Biophys Acta; 1985 Jan 28; 838(1):49-53. PubMed ID: 2981567.
    Abstract:
    The effects of forskolin on differentiation of osteoblastic cells (clone MC3T3-E1) cultured in alpha-minimum essential medium containing 0.1% bovine serum albumin were investigated by assays of intracellular cyclic AMP level and alkaline phosphatase activity in the cells. Forskolin increased cyclic AMP production in the cells in a dose-related manner, the maximum increase being 250-fold above that of the controls. Alkaline phosphatase activity in the cells was also elevated as early as 24 h and rose to nearly its maximum at 48 h. The elevation was dose-dependent, with a maximum increase at 5 X 10(-6) M forskolin. Forskolin and prostaglandin E2 showed a supraadditive effect on cyclic AMP production in the cells and had an additive effect on alkaline phosphatase activity, whereas forskolin and dibutyryl cyclic AMP had little additive effect on either cyclic AMP production or enzyme activity. These results suggest that cyclic AMP is closely linked to the differentiation of osteoblastic cells in vivo.
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