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Related Experiment Videos

Cell surface proteoglycan expression correlates with epithelial-mesenchymal interaction during tooth morphogenesis.

I Thesleff1, M Jalkanen, S Vainio

  • 1Department of Pedodontics and Orthodontics, University of Helsinki, Finland.

Developmental Biology
|October 1, 1988
PubMed
Summary
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The expression of a specific proteoglycan antigen changes during tooth development, highlighting its role in guiding epithelial-mesenchymal interactions. This antigen

Area of Science:

  • Developmental Biology
  • Cell Biology
  • Extracellular Matrix Research

Background:

  • Tooth development involves complex epithelial-mesenchymal interactions.
  • The extracellular matrix plays a crucial role in mediating these interactions.
  • Cell surface receptors, including proteoglycans, are likely involved in regulating these developmental processes.

Purpose of the Study:

  • To investigate the distribution of an epithelial cell surface proteoglycan antigen during tooth morphogenesis.
  • To understand the role of this proteoglycan in epithelial-mesenchymal interactions during tooth development.
  • To correlate proteoglycan expression patterns with specific developmental stages and cell differentiation.

Main Methods:

  • Immunohistochemical analysis of tooth sections at various developmental stages.

Related Experiment Videos

  • Examination of proteoglycan antigen distribution in epithelial and mesenchymal tissues.
  • Correlation of antigen expression with morphogenetic events and cell differentiation.

    • Main Results:

    • The proteoglycan antigen showed dynamic expression changes in both epithelial and mesenchymal compartments during tooth development.
    • Intense staining was observed in early oral and dental epithelium, decreasing in the enamel organ but reappearing in stratum intermedium and stellate reticulum.
    • Mesenchymal expression shifted from weak in neural crest cells to strong in the dental papilla, persisting in the dental sac but absent in odontoblasts.

    Conclusions:

    • The proteoglycan antigen's expression is tightly regulated during tooth morphogenesis, following morphogenetic rather than histologic boundaries.
    • Changes in expression suggest a specific function in mediating epithelial-mesenchymal interactions essential for guiding tooth development.
    • The loss of expression during terminal cell differentiation indicates its role in maintaining developmental plasticity.