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Growth factors and tooth development.

A M Partanen1, I Thesleff

  • 1Institute of Dentistry, University of Helsinki, Finland.

The International Journal of Developmental Biology
|March 1, 1989
PubMed
Summary
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Transferrin is essential for early tooth development and morphogenesis. Epidermal growth factor (EGF) stimulates proliferation but inhibits tooth formation, with sensitivity varying by developmental stage.

Area of Science:

  • Developmental Biology
  • Cell Biology
  • Biochemistry

Background:

  • Tooth development is a complex process regulated by various growth factors.
  • Understanding the specific roles of these factors is crucial for regenerative dentistry and developmental studies.

Purpose of the Study:

  • To investigate the effects of transferrin and polypeptide growth factors on mouse embryonic tooth germ development in organ culture.
  • To determine the stage-dependent responsiveness of tooth germs to epidermal growth factor (EGF).

Main Methods:

  • Organ culture of mouse embryonic tooth germs in a chemically defined medium.
  • Addition of transferrin and various polypeptide growth factors (FGF, PDGF, EGF).
  • Autoradiography to localize proliferating cells and study receptor distribution for transferrin and EGF.

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Main Results:

  • Transferrin is a necessary growth factor for early tooth morphogenesis, supporting bud and early cap stages.
  • EGF stimulated cell proliferation but inhibited tooth morphogenesis and differentiation.
  • Tooth germ sensitivity to EGF was stage-dependent, with early cap stages being most sensitive.

Conclusions:

  • Transferrin plays a critical role in early tooth morphogenesis by stimulating cell proliferation.
  • EGF's effect on tooth development is complex, promoting proliferation while hindering morphogenesis and differentiation in a stage-specific manner.
  • Differential receptor expression likely mediates the stage-dependent responses to EGF and transferrin.