Abstract
To elucidate the mechanism of root formation in tooth development, we examined the role of insulin-like growth factor I (IGF-I) on early root formation in mandibular first molar teeth from 5-day-old mice. Immunohistochemistry revealed the specific localization of the IGF-I receptor in Hertwig’s epithelial root sheath (HERS) in the tooth root. The effect of IGF-I on root development, especially on HERS, was subsequently examined in vitro. The control culture showed normal development of HERS and the periodontium, resembling that in vivo. However, the presence of 100 ng/ml IGF-I resulted in elongation of HERS and increased cell proliferation in its outer layer. These effects were negated by the addition of antibodies specific for IGF-I. Thus, we propose that IGF-I is involved in early root formation by regulating the mitotic activity in the outer layer of HERS.
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The authors thank Dr. Yasunori Sakakura (Health Sciences University of Hokkaido) for critical reading of the manuscript.
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This study was partly supported by grants to N.F. from KAKENHI (no. 13671909), to N.F. and M.J.T. from the Promotion of 2001-Multidisciplinary Research Projects in 2001–2005, and to N.F. and K.I. from Iwate Medical University—Keiryokai Research Foundation (no. 64).
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Fujiwara, N., Tabata, M.J., Endoh, M. et al. Insulin-like growth factor-I stimulates cell proliferation in the outer layer of Hertwig’s epithelial root sheath and elongation of the tooth root in mouse molars in vitro. Cell Tissue Res 320, 69–75 (2005). https://doi.org/10.1007/s00441-004-1065-5
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DOI: https://doi.org/10.1007/s00441-004-1065-5