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A Hedgehog-Foxf axis coordinates dental follicle-derived alveolar bone formation
Mizuki Nagata1,2, Gaurav T Gadhvi3, Taishi Komori4
1Department of Orthodontics, University of Texas Health Science Center at Houston School of Dentistry, Houston, TX, USA.
Nature Communications
|July 2, 2025
Summary
Hedgehog signaling must be transiently activated and then suppressed to form alveolar bone. This pathway regulates dental follicle progenitor cells, crucial for tooth support and preventing bone loss.
Area of Science:
- Developmental Biology
- Craniofacial Biology
- Bone Biology
Background:
- Alveolar bone, essential for tooth support, develops from the dental follicle (DF) via epithelial-mesenchymal interactions.
- The precise regulation of DF progenitor cell differentiation into alveolar osteoblasts remains unclear.
- Understanding these mechanisms is key to addressing alveolar bone loss.
Purpose of the Study:
- To elucidate the role of Hedgehog signaling in regulating DF progenitor cell fate during alveolar bone formation.
- To investigate the interaction between Hedgehog signaling and PTHrP-expressing cells in tooth root development.
- To identify key molecular pathways governing osteoblast differentiation in the dental follicle.
Main Methods:
- Utilized mouse models with conditional gene inactivation (Pthrp-creER, Ptch1-floxed alleles) to manipulate Hedgehog signaling.
- Examined the effects of constitutive Hedgehog activation on alveolar bone and ligament development.
- Assessed the impact of inactivating the Hedgehog-target gene Foxf1 in specific DF progenitor populations.
Main Results:
- Hedgehog signaling is transiently activated during tooth root and alveolar bone formation.
- Constitutive Hedgehog activation in PTHrP+ DF cells suppressed osteoblast differentiation, leading to severe alveolar bone loss.
- Inactivating Foxf1 partially rescued alveolar bone defects in Hedgehog-activated cells, highlighting the pathway's importance.
Conclusions:
- Suppression of the Hedgehog-Foxf pathway is essential for directing PTHrP+ DF cells towards alveolar osteoblast differentiation.
- This study reveals a unique, tooth-specific bone formation mechanism requiring precise on-off regulation of Hedgehog signaling.
- Findings provide insights into preventing and treating conditions associated with alveolar bone loss.
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