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Molar tooth development in caspase-3 deficient mice.

Eva Matalova1, Paul T Sharpe, Saquib A Lakhani

  • 1Laboratory of Animal Embryology, Institute of Animal Physiology and Genetics, Academy of Sciences, Brno, Czech Republic. matalova@iach.cz

The International Journal of Developmental Biology
|April 6, 2006
PubMed
Summary

Caspase-3 activation is involved in dental apoptosis during tooth development. However, caspase-3 deficient mice did not show significant defects in mature molar teeth, suggesting it is not fundamental for mineralization.

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Genetics

Background:

  • Tooth morphogenesis involves apoptosis, a programmed cell death process.
  • Dental apoptosis is caspase-dependent, with caspase-3 activation observed.
  • The precise role of caspase-3 in molar tooth development and mineralization remains unclear.

Purpose of the Study:

  • To investigate the role of caspase-3 in dental apoptosis and molar tooth morphogenesis.
  • To analyze the impact of caspase-3 deficiency on tooth development and structure.

Main Methods:

  • Utilized caspase-3 mutant mice on B57BL/6 and 129X1/SvJ genetic backgrounds.
  • Analyzed embryonic mouse embryos at E15.5 for enamel knot formation and gene expression (Shh, Fgf-4).
  • Examined adult molar teeth for structural and morphological alterations compared to heterozygote littermates.

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Main Results:

  • Caspase-3 deficient mice on B57BL/6 background showed early epithelial disorganization in primary enamel knot areas, with altered Shh expression.
  • Despite early defects, secondary enamel knots formed correctly (indicated by Fgf-4 expression), and adult teeth showed no major structural changes.
  • Caspase-3 deficient mice on 129X1/SvJ background exhibited only posterior displacement of upper molars, likely due to secondary effects from brain malformation.

Conclusions:

  • Caspase-3 activation is involved in dental apoptosis but appears non-essential for the formation of normal mineralized molar teeth.
  • The study suggests that caspase-3 is not fundamental for the overall structure and mineralization of mature molar teeth.