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Contribution of mesenchymal proliferation in tooth root morphogenesis
W-J Sohn1, M-A Choi, H Yamamoto
1Department of Biochemistry, School of Dentistry, IHBR, Kyungpook National University, Daegu, Korea.
Journal of Dental Research
|October 25, 2013
Summary
Spatially regulated mesenchymal proliferation in mouse molars is crucial for forming distinct root structures. Inhibiting cell structure formation alters root development, leading to single roots instead of two.
Area of Science:
- Developmental biology
- Craniofacial development
- Tooth morphogenesis
Background:
- The first lower molar in mice develops two cylindrical roots post-natally.
- Understanding multi-rooted tooth formation requires defining cellular events in specific developmental regions.
Purpose of the Study:
- To compare morphogenesis and cellular events in the mesial-root-forming (MRF) and bifurcation-forming (BF) regions of the first lower molar.
- To elucidate the mechanisms behind multi-rooted tooth development.
Main Methods:
- Comparative analysis of MRF and BF regions in mouse molar development.
- Pharmacological inhibition of microtubule (nocodazole) and actin (cytochalasin-D) polymerization in cultured roots.
- Immunolocalization and 3D reconstruction to analyze cellular events.
Main Results:
- Mesenchyme in the MRF region exhibited higher proliferation than the BF region.
- Pharmacological treatments disrupted normal root morphology, with nocodazole reducing root diameter and cytochalasin-D inducing single-root formation.
- Higher mesenchymal proliferation in the MRF region is linked to multi-rooted tooth formation.
Conclusions:
- Spatially regulated mesenchymal proliferation is essential for generating cylindrical root structures in multi-rooted teeth.
- Mesenchymal proliferation may act as a physical barrier to epithelial invagination during root development.
- Microtubule and actin dynamics are critical for normal tooth root morphogenesis.
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