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NGF, BDNF, NT3, NT4 and GDNF in tooth development

C A Nosrat1, K Fried, T Ebendal

  • 1Dept. of Neuroscience, Karolinska Institutet, Stockholm, Sweden. christopher.nosrat@neuro.ki.se

European Journal of Oral Sciences
|April 16, 1998
PubMed
Summary

This study maps neurotrophic factor gene activity during tooth development. Neurotrophins and GDNF show distinct expression patterns, suggesting roles in innervation and tooth morphogenesis.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Oral Biology

Background:

  • Neurotrophic factors are crucial for neuronal development, maintenance, and regeneration.
  • Understanding their role in tooth development is essential for comprehending dental innervation and morphogenesis.

Purpose of the Study:

  • To investigate the gene expression patterns of five key neurotrophic factors during rat tooth development.
  • To correlate the expression of these factors with the stages of dental innervation and tooth formation.

Main Methods:

  • In situ hybridization was employed to detect the mRNA expression of nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF), neurotrophin 3 (NT3), neurotrophin 4 (NT4), and glial cell line-derived neurotrophic factor (GDNF).
  • Expression patterns were analyzed in postnatal rat teeth at different developmental stages.

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Main Results:

  • NGF and BDNF mRNAs were primarily found in the dental papilla/pulp, coinciding with the onset of dental innervation.
  • NT3 and NT4 mRNAs showed predominantly epithelial expression during early, non-innervated developmental stages.
  • GDNF mRNA was initially detected in the dental epithelium, later shifting to mesenchymal expression in the odontoblast layer and subodontoblast zone.

Conclusions:

  • Neurotrophins and GDNF exhibit distinct spatial and temporal expression patterns during tooth development.
  • These factors likely play multifaceted roles, influencing both the establishment of dental innervation and the morphogenetic processes of developing epithelial and mesenchymal cells.