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Related Experiment Videos

Epithelial Dlx-2 homeogene expression and cementogenesis.

F Lézot1, J L Davideau, B Thomas

  • 1Laboratoire de Biologie-Odontologie, EA 2380, Institut Biomédical des Cordeliers, Université Paris VII, Paris, France.

The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society
|January 20, 2000
PubMed
Summary

Distal-less homeoprotein (Dlx-2) is expressed in cementoblasts during tooth biomineralization. Dlx-2 expression may indicate cementoblast subpopulations with an epithelial origin.

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Area of Science:

  • Dental Biology
  • Developmental Biology
  • Histochemistry

Background:

  • The transcription factor Dlx-2 (distal-less gene) is crucial for early tooth development.
  • Its role in later biomineralization stages, particularly in cementoblasts, remained uninvestigated.
  • Cementoblasts are dental cells analogous to osteoblasts, suggesting a unique role in mineralization.

Purpose of the Study:

  • To investigate the expression pattern of Dlx-2 during late tooth development and biomineralization.
  • To determine the precise localization of Dlx-2 in cementoblasts and related cell types.
  • To explore the potential link between Dlx-2 expression and the origin of cementum-forming cells.

Main Methods:

  • Utilized transgenic mice harboring a Dlx-2/LacZ reporter construct.

Related Experiment Videos

  • Mapped Dlx-2 expression patterns using X-gal staining in incisors and molars.
  • Examined expression during different stages of cementum formation (acellular and cellular).

    • Main Results:

    • Dlx-2 expression was detected in the root epithelium during initial root formation.
    • Significant Dlx-2 expression was observed in differentiated cementoblasts during acellular cementum formation.
    • During cellular cementum formation, Dlx-2 was restricted to inner cementoblasts and entrapped cementocytes.

    Conclusions:

    • Dlx-2 expression is present in cementoblasts during both acellular and cellular cementum formation.
    • These findings support a complex origin for cementum-forming cells, potentially involving epithelial derivatives.
    • Dlx-2 may serve as a marker for specific cementoblast subpopulations of epithelial origin.