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Role of Zinc in Regulation of Protein Tyrosine Phosphatase Activity in Osteoblastic MC3T3-E1 Cells: Zinc Modulation of Insulin-like Growth Factor-I’s Effect

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Abstract

Zinc, an essential trace element, has been demonstrated to stimulate bone growth in animal and human. The cellular mechanism by which zinc stimulates bone growth has not been fully clarified. The effect of hormone and zinc on protein tyrosine phosphatase activity in osteoblastic MC3T3-E1 cells was investigated. Cells were cultured for 72 h in medium containing 10% fetal bovine serum (FBS) to obtain subconfluent monolayers, and then exchanged to culture medium containing either vehicle, zinc sulfate or various hormones in the absence of 10% FBS. After medium change, cells were cultured for 48 h. Protein tyrosine phosphatase activity in the lysate of cells was significantiy increased by culture with zinc (10−6 – 10−4 M). The effect of zinc in increasing the enzyme activity was completely blocked by culture with cycloheximide (10−7 M), an inhibitor of protein synthesis, or 5, 6-dichloro-l-β-D- riboifuranosylbenzimidarzole (DRB) (10−6 M), an inhibitor of translational activity. Addition of calcium chloride (10 μM) into the reaction mixture caused a significant increase in protein tyrosine phosphatase activity; this increase was completely blocked in the presence of trifluoperazine (50 μM), an antagonist of calmodulin. Culture with zinc caused a significant increase in Ca2+/calmodulin-dependent protein tyrosine phosphatase activity in osteoblastic cells. Protein tyrosine phosphatase activity was significantly raised by culture with parathyroid hormone (human PTH [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33]; 10−7 M), 17β-estradiol (10−7 M), insulin-like growth factor-I (IGF-I; 10−8 M) or insulin (10−8 M). The enzyme activity was not significantly enhanced by the addition of calcium (10 μM) into the reaction mixture. The effect of PTH or IGF-I in increasing protein tyrosine phosphatase activity was completely blocked by culture with DRB. The IGF-I-induced increase in enzyme activity was significantly enhanced by culture with zinc. Such an effect was not seen in the case of PTH. Moreover, the effect of IGF-I in increasing proliferation of osteoblastic cells was significantly enhanced by culture with zinc. The effect of PTH was not enhanced by zinc. This study demonstrates that protein tyrosine phosphatase activity in osteoblastic cells is enhanced by various bone anabolic factors, and that zinc modulates the effect of IGF-I on protein tyrosine phosphatase activity and cell proliferation.

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  1. Laboratory of Endocrinology and Molecular Metabolism, Graduate School of Nutritional Sciences, University of Shizuoka, 52−1 Yada, Shizuoka, 422-8526, Japan

    M. Yamaguchi & M. Fukagawa

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  1. M. Yamaguchi
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  2. M. Fukagawa
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Yamaguchi, M., Fukagawa, M. Role of Zinc in Regulation of Protein Tyrosine Phosphatase Activity in Osteoblastic MC3T3-E1 Cells: Zinc Modulation of Insulin-like Growth Factor-I’s Effect. Calcif Tissue Int 76, 32–38 (2005). https://doi.org/10.1007/s00223-004-0052-x

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