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Effects of epidermal growth factor on osteoblastic cellsin vitro

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Summary

The effect of epidermal growth factor (EGF) on clone MC3T3-El cells that have osteoblastic activity was examined by phase-contrast microscopy and electron microscopy; hydroxyproline content, collagen synthesis, collagen pattern, and alkaline phosphatase (ALP) activity were also determined. We found that EGF (0.4 ng/ml) transformed the cells from their normal polygonal shape to a spindle-like morphology by 8 h. This hormone also caused dose-related suppression of hydroxyproline content and ALP activity which was detectable 2 days and 1 day, respectively, after EGF addition. Indomethacin did not affect hydroxyproline content and ALP activity, suggesting that the effect of EGF on the cells may not be mediated by prostaglandins. Epidermal growth factor at concentrations of 2 to 50 ng/ml significantly decreased collagen synthesis in the cells, whereas protein synthesis was stimulated. Electron microscopy demonstrated that collagen fiber formation was also reduced by EGF; an immature type of fibril was observed compared with the typical cross-striated one in the controls. Moreover, the hormone treatment also resulted in the appearance of type III collagen in addition to the type I already present in the cells. These suppressive effects of EGF on MC3T3-El cellsin vitro suggest that this hormone may be involved in bone remodellingin vivo as well.

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Authors and Affiliations

  1. Department of Oral Anatomy, Josai Dental University, 350-02, Sakado, Saitama

    M. Kumegawa & T. Yajima

  2. Pharmacology, Josai Dental University, 350-02, Sakado, Saitama

    M. Hiramatsu & K. Hatakeyama

  3. Department of Physiology, Tohoku Dental School, 963, Koriyama, Fukushima

    H. Kodama

  4. Department of Oral Anatomy, Kyushu University, 812, Fukuoka, Japan

    T. Osaki & K. Kurisu

Authors
  1. M. Kumegawa
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  2. M. Hiramatsu
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  3. K. Hatakeyama
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  4. T. Yajima
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  5. H. Kodama
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  6. T. Osaki
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  7. K. Kurisu
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Kumegawa, M., Hiramatsu, M., Hatakeyama, K. et al. Effects of epidermal growth factor on osteoblastic cellsin vitro . Calcif Tissue Int 35, 542–548 (1983). https://doi.org/10.1007/BF02405091

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