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Synergistic effect of BMP-2 and ascorbate on the phenotypic expression of osteoblastic MC3T3-E1 cells

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Abstract

Of TGF-β superfamily proteins, BMP-2 enhanced alkaline phosphatase (ALP) activity in cultured osteoblastic cells, MC3T3-E1, to the same level promoted by ascorbate, whereas TGF-βs (β1, β2, β3) reduced ALP activity and altered cell morphology under the same conditions. Activin appeared to have no distinct effect on ALP synthesis. Ascorbate dependent increase in ALP synthesis was markedly stimulated in the presence of BMP-2. The synergistic effect of ascorbate on ALP synthesis was replaced by type I collagen coated on the culture dish. However, BMP-2 appeared not to bind to type I collagen. These findings indicate that BMP-2 acts directly on osteoblastic cells through its receptors and collagenous matrix can neither recruit BMP-2 nor modulate directly the action of BMP-2 in the pericellular area. Treatment of cells grown in ascorbate media with TGF-βs decreased rapidly the cellular ALP activity indicating that TGF-βs direct cells to the differentiated stage.

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Authors and Affiliations

  1. Department of Applied Biological Sciences, Faculty of Agriculture, Nagoya University, 464-01, Nagoya, Japan

    Yasuyoshi Torii, Kiyotaka Hitomi & Norihiro Tsukagoshi

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  1. Yasuyoshi Torii
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  2. Kiyotaka Hitomi
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  3. Norihiro Tsukagoshi
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Torii, Y., Hitomi, K. & Tsukagoshi, N. Synergistic effect of BMP-2 and ascorbate on the phenotypic expression of osteoblastic MC3T3-E1 cells. Mol Cell Biochem 165, 25–29 (1996). https://doi.org/10.1007/BF00229742

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  • DOI: https://doi.org/10.1007/BF00229742

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