SCAPs Regulate Differentiation of DFSCs During Tooth Root Development in Swine

Area of Science:

• Biomaterials Science
• Developmental Biology
• Regenerative Medicine

Background:

• The periodontium, crucial for balancing occlusal forces, develops from the dental follicle (DF), except for the gingiva.
• The precise morphological changes and regulatory factors governing DF differentiation during root elongation are not fully understood.
• Miniature pigs offer a relevant model for craniofacial research due to anatomical similarities with humans.

Purpose of the Study:

• To investigate the factors influencing dental follicle differentiation during root development using a miniature pig model.
• To explore the role of the apical papilla in regulating dental follicle stem cell differentiation.

Main Methods:

• Utilized the third deciduous incisor of miniature pigs to study dental follicle morphology and gene expression.
• Analyzed the expression patterns of WNT5a, β-Catenin, and COL-I within the developing dental follicle.
• Co-cultured dental follicle stem cells (DFSCs) with stem cells of the apical papilla (SCAPs) to assess their interaction.

Main Results:

• Observed a crescent shape of the dental follicle between the root apex and alveolar bone during root elongation.
• Found increasing expression of WNT5a, β-Catenin, and COL-I from the DF center to the lateral coronal corner, correlating with periodontium differentiation.
• Co-culture with SCAPs inhibited the osteogenesis and fibrogenesis of DFSCs, indicating apical papilla influence.

Conclusions:

• The apical papilla appears to regulate dental follicle differentiation, potentially maintaining DFSCs in an undifferentiated state until root development completion.
• These findings provide insights into the complex interactions between the root apex and surrounding tissues during root and periodontium development.
• The study highlights potential avenues for future research in root regeneration in larger mammals.