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Caspase-7 in molar tooth development
E Matalova1, T Vanden Berghe, E Svandova
1Institute of Animal Physiology and Genetics CAS, v.v.i., Brno, Czech Republic. matalova@iach.cz
Objectives:
The primary enamel knot (PEK) is a population of cells that shows spatio-temporal restricted apoptosis during tooth development. It has been shown that caspase-9 and Apaf-1 are essential for apoptosis in the PEK as well as the central caspase-3. Caspase-7, as another executioner member in the caspase machinery, is considered to have caspase-3 like properties.
Design:
The aim of this study was to detect caspase-7 activation during molar tooth development with a special focus on the cells of the PEK and to correlate the expression with the pattern of apoptosis and caspase-3 activation. Apoptosis in the PEK was investigated in caspase-7 deficient mice to examine the functional consequence of loss of this specific caspase. In addition, odontoblasts and ameloblasts, which are known to undergo cell death during their secretory and maturation stages, were investigated.
Results:
Cleaved caspase-7 was found in the apoptotic region of the PEK, however, caspase-7-deficient mice still possessed apoptotic cells in the PEK in a similar distribution to the wild type. Caspase-7 is therefore not essential for apoptosis in the PEK. Notably, cleaved caspase-7-positive cells were found at later stages in odontoblasts and ameloblasts, but expression did not correlate with apoptosis in these tissues.
Conclusions:
The results indicate a non-essential apoptotic role of caspase-7 in the PEK apoptosis but suggest also possible non-apoptotic functions for caspase-7 in tooth development.
Insights
Caspase-7 is not essential for apoptosis in the primary enamel knot during tooth development. However, its presence in odontoblasts and ameloblasts suggests potential non-apoptotic roles in molar tooth formation.
Area of Science:
- Developmental Biology
- Cell Biology
- Molecular Biology
Background:
- The primary enamel knot (PEK) undergoes programmed cell death during tooth development.
- Caspase-9, Apaf-1, and caspase-3 are known to be crucial for apoptosis in the PEK.
- Caspase-7, an executioner caspase, is thought to possess caspase-3-like functions.
Purpose of the Study:
- To investigate caspase-7 activation during molar tooth development, focusing on the PEK.
- To correlate caspase-7 expression with apoptosis and caspase-3 activation patterns.
- To determine the functional significance of caspase-7 in PEK apoptosis using knockout mice.
Main Methods:
- Analysis of caspase-7 activation in wild-type and caspase-7-deficient mice during molar tooth development.
- Investigation of apoptosis in the PEK, odontoblasts, and ameloblasts.
- Correlation of cleaved caspase-7 expression with apoptotic cell distribution.
Main Results:
- Cleaved caspase-7 was detected in the apoptotic regions of the PEK.
- Caspase-7 deficiency did not alter the pattern or extent of apoptosis in the PEK.
- Cleaved caspase-7 was observed in odontoblasts and ameloblasts at later stages, but not consistently with apoptosis.
Conclusions:
- Caspase-7 is not essential for apoptosis in the primary enamel knot during tooth development.
- The study suggests potential non-apoptotic functions for caspase-7 in tooth development, particularly in odontoblasts and ameloblasts.
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