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Related Experiment Videos

Evolution of cytokeratin expression in developing human tooth germ.

A Pelissier1, J P Ouhayoun, M H Sawaf

  • 1Laboratoire de Biologie-Odontologie Université Paris VII, France.

Journal De Biologie Buccale
|June 1, 1990
PubMed
Summary

Human enamel organ cytokeratin expression changes significantly around weeks 12-13 of development. This switch in cytokeratin expression suggests the initiation of final cell differentiation during early human tooth development.

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Biochemistry

Background:

  • The developing human enamel organ is crucial for tooth formation.
  • Understanding cytokeratin expression patterns provides insights into cellular differentiation.
  • Previous studies have not fully elucidated the dynamic changes in cytokeratins during early human enamel organ development.

Purpose of the Study:

  • To investigate the temporal expression of cytokeratins in the developing human enamel organ.
  • To identify specific time points of significant changes in cytokeratin profiles.
  • To correlate cytokeratin expression shifts with the initiation of final cell differentiation.

Main Methods:

  • Indirect immunofluorescence microscopy was employed.
  • A panel of 15 monoclonal antibodies targeting various cytokeratins was used.

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  • Samples from human embryos between the 10th and 23rd gestational weeks were analyzed.

    • Main Results:

    • Five cytokeratin antibodies showed no reactivity throughout the study period.
    • Five cytokeratin antibodies demonstrated consistent positivity.
    • Five cytokeratin antibodies exhibited altered reactivity, appearing or increasing between weeks 12 and 13.

    Conclusions:

    • A distinct switch in cytokeratin expression occurs around the 12th-13th gestational weeks.
    • No major changes in cytokeratin expression were observed after this critical period.
    • These findings suggest that final cell differentiation in the human enamel organ is initiated around weeks 12-13.