Abstract
Immunohistochemistry was used to study the ontogeny of GH receptor/binding protein (GHR/BP) and IGF-I from the 13-day-old embryo (E13) to the E19 rat fetus in the developing incisor and molar. Analysis of serial sections revealed diffuse staining of GHR/BP and IGF-I at the bud and early cap stages within both the mesenchyme of the dental papilla and the ectodermal-erived enamel organ. Just before transition to the cap stage, immunoreactivity of GHR/BP and IGF-I increased in the epithelial bud and extended to the condensed dental mesenchyme. At the cap stage, the dental epithelium showed an intense expression of GHR/BP and IGF-I, whereas the dental mesenchymal cells showed very weak staining. The inner enamel epithelium and the outer enamel epithelium were positive for both GHR/BP and IGF-I in the bell stage. Differentiating ameloblasts, odontoblasts and the secretory ameloblasts and odontoblasts continued to express GHR/BP and IGF-I in incisors. These findings support the premise that growth hormone and IGF-I may play a role in embryonic tooth development by regulating the epithelial-mesenchymal interactions that influence events in growth and cytodifferentiation.
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Joseph, B.K., Savage, N.W., Young, W.G. et al. Prenatal expression of growth hormone receptor/binding protein and insulin-like growth factor-I (IGF-I) in the enamel organ. Anat Embryol 189, 489–494 (1994). https://doi.org/10.1007/BF00186823
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DOI: https://doi.org/10.1007/BF00186823