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Epithelial-mesenchymal signaling during tooth development

I Thesleff1, A Vaahtokari, P Kettunen

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

Connective Tissue Research
|January 1, 1995
PubMed
Summary
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Epithelial-mesenchymal interactions guide tooth development through sequential signaling. Gene expression in the dental mesenchyme is upregulated during early tooth germ morphogenesis, indicating a crucial role in this process.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Oral Biology

Background:

  • Organ development relies on inductive tissue interactions, primarily between epithelial and mesenchymal tissues.
  • These interactions are sequential and reciprocal, forming a chain of signaling events.
  • Epithelial-mesenchymal interactions are fundamental to both morphogenesis and cell differentiation in developing organs, including teeth.

Purpose of the Study:

  • To investigate the role of epithelial-mesenchymal interactions in regulating gene expression during early tooth germ development.
  • To understand how signaling between dental epithelium and mesenchyme influences tooth morphogenesis.
  • To identify key molecules involved in these crucial developmental processes.

Main Methods:

  • In situ hybridization and immunohistology to study molecule expression patterns.

Related Experiment Videos

  • Experimental tissue recombination studies in developing tooth germs.
  • Analysis of gene expression changes in response to inductive signals.

    • Main Results:

    • Numerous molecules, including transcription factors (Msx-1, Msx-2, Egr-1), growth factors (TGF-βs, BMPs, FGFs), and structural proteins (syndecan, tenascin), are expressed in time- and space-specific patterns.
    • Tissue recombination confirmed that epithelial-mesenchymal interactions regulate the expression of specific molecules in the early tooth germ.
    • Gene expression is upregulated in the condensed mesenchyme during early morphogenesis, when the dental epithelium induces mesenchymal cell condensation.

    Conclusions:

    • Epithelial-mesenchymal interactions are critical for regulating gene expression and guiding tooth morphogenesis.
    • The dental mesenchyme plays an increasingly important role in instructing tooth development, with a shift in morphogenetic capacity from the epithelium.
    • Understanding these molecular interactions provides insights into fundamental developmental processes applicable to multiple organs.