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Transferrin is required for early tooth morphogenesis.

A M Partanen, I Thesleff, P Ekblom

    Differentiation; Research in Biological Diversity
    |January 1, 1984
    PubMed
    Summary
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    Transferrin is essential for early tooth development, acting as a fetal growth factor. Its requirement decreases as tooth germs mature, with insulin inhibiting this crucial process.

    Area of Science:

    • Developmental Biology
    • Cell Biology
    • Biochemistry

    Background:

    • Tooth morphogenesis is a complex process influenced by circulating molecules.
    • Serum factors are known to support cell growth and differentiation in vitro.
    • The specific roles of molecules like transferrin and insulin in early tooth development require further elucidation.

    Purpose of the Study:

    • To investigate the role of circulating molecules, specifically transferrin and insulin, in early mouse embryonic tooth morphogenesis.
    • To determine the changing requirements for serum factors during different stages of tooth development (bud to cap stage).
    • To assess the impact of transferrin and insulin on tooth germ growth and differentiation in organ culture.

    Main Methods:

    • Organ culture of mouse embryonic molar-tooth germs at different developmental stages (day 13, 14, and 15).

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  • Culture in basal medium with varying supplements, including transferrin and insulin, or transferrin-depleted serum.
  • Analysis of DNA content to correlate molecular effects with cell proliferation.

    • Main Results:

    • The requirement for serum factors in tooth morphogenesis diminishes with developmental progression.
    • Transferrin (50 µg/ml) is necessary for the morphogenesis of day-14 and day-13 tooth germs, but not for day-15.
    • Insulin was found to inhibit, rather than promote, tooth development; transferrin's support of morphogenesis correlated with stimulated growth, suggesting its role as a fetal growth factor.

    Conclusions:

    • Transferrin is a critical factor for early tooth morphogenesis, functioning as a fetal growth factor.
    • The dependence on specific serum factors, like transferrin, decreases as tooth development advances.
    • The development of a chemically defined medium containing transferrin facilitates future research into other growth factors involved in tooth development.