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Dentinogenesis and Tooth-Alveolar Bone Complex Defects in BMP9/GDF2 Knockout Mice
Xia Huang1,2, Feilong Wang2,3, Chen Zhao4
11 Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences, The Affiliated Hospital of Stomatology, Chongqing Medical University, Chongqing, China.
Stem Cells and Development
|March 1, 2019
Summary
Bone Morphogenetic Protein 9 (BMP9) is crucial for tooth development, regulating dentin formation and root length. BMP9 deficiency in mice leads to dental defects resembling dentinogenesis imperfecta.
Area of Science:
- Developmental Biology
- Molecular Signaling
- Dental Research
Background:
- Tooth development relies on complex signaling pathways, including bone morphogenetic proteins (BMPs).
- BMP9, a potent osteogenic inducer, has a largely unexplored role in tooth formation.
Purpose of the Study:
- To investigate the function of BMP9 signaling in tooth development.
- To characterize the dental and alveolar bone phenotypes in BMP9-deficient mice.
Main Methods:
- Expression analysis of BMP9 in developing tooth germs.
- Generation and analysis of a BMP9 knockout (BMP9-KO) mouse model.
- Morphological, micro-computed tomography, and 3D reconstruction analyses of teeth and alveolar bone.
Main Results:
- BMP9 is widely expressed in tooth germ cells and alveolar bone osteoblasts.
- BMP9-KO mice exhibit significantly abraded tooth cusps, shorter roots, reduced dentin thickness, and enlarged pulp canals.
- Alveolar bone in BMP9-KO mice shows decreased length, mineral density, and structural integrity.
- BMP9 induces dentin sialophosphoprotein and dentin matrix protein 1 expression in dental stem cells.
Conclusions:
- BMP9 plays a critical role in regulating dentinogenesis and overall tooth development.
- BMP9 deficiency results in phenotypes mimicking dentinogenesis imperfecta.
- BMP9 holds potential for therapeutic applications in regenerative dentistry and tissue engineering.
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