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Updated: May 17, 2026
11:14
Modeling Paracrine Noncanonical Wnt Signaling In Vitro
Published on: December 10, 2021
Excessive Wnt/β-catenin signaling disturbs tooth-root formation.
1Cluster for Craniofacial Development and Regeneration Research, Institute of Oral Biosciences, Chonbuk National University School of Dentistry, Jeonju, South Korea.
Journal of Periodontal Research
|October 12, 2012
Summary
Temporospatial regulation of Wingless-type MMTV integration site family (Wnt)/β-catenin signaling is crucial for tooth root and cementum formation. Impaired Wnt/β-catenin signaling in mice leads to abnormal cell differentiation and defective matrix formation during root development.
Area of Science:
- Dental Development
- Molecular Biology
- Cell Signaling
Background:
- Wingless-type MMTV integration site family (Wnt)/β-catenin signaling is vital for skeletal development.
- Its role in tooth root formation is not well understood.
- Previous studies indicated excessive dentin/cementum formation with constitutive β-catenin stabilization.
Purpose of the Study:
- To investigate the role of Wnt/β-catenin signaling in tooth root formation.
- To analyze molar roots in mice with stabilized β-catenin in dental mesenchyme.
Main Methods:
- Generated OC-Cre:Catnb(+/lox(ex3)) mice.
- Analyzed mandibular molars using radiography, histomorphometry, and immunohistochemistry.
Main Results:
- Mutant mice exhibited impaired root formation, with roots approximately half the length of wild-type littermates.
- Dental papilla cells showed premature differentiation and disorganized arrangement.
- Root dentin was thin and hypomineralized, with altered expression of matrix proteins (e.g., Biglycan, DSPP, DMP1, DKK1).
- Cementoblast and cementum matrix proteins (e.g., ENPP1, BSP, DKK2) were also dysregulated.
Conclusions:
- Temporospatial regulation of Wnt/β-catenin signaling is essential for proper cell differentiation and matrix formation during root and cementum development.
- Aberrant signaling disrupts normal root and cementum formation, leading to structural defects.
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