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Bmi1 regulate tooth and mandible development by inhibiting p16 signal pathway
Ying Yin1,2, Nan Zhou1,3, Hui Zhang1
1Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, China.
Journal of Cellular and Molecular Medicine
|March 21, 2021
Summary
Deleting p16 improves tooth and mandible growth in Bmi1-deficient mice. This study shows Bmi1 regulates development by inhibiting the p16 pathway, crucial for cell cycle entry.
Area of Science:
- Developmental biology
- Genetics
- Oral biology
Background:
- Bmi1 deficiency causes tooth and mandible growth retardation.
- The role of the p16 signaling pathway in Bmi1-mediated development is not fully understood.
Purpose of the Study:
- To investigate if deleting p16 can rescue tooth and mandible growth defects in Bmi1-deficient mice.
- To elucidate the role of the Bmi1/p16 signaling pathway in tooth and mandible development.
Main Methods:
- Comparison of tooth and mandible phenotypes in wild-type, p16 knockout, Bmi1 knockout, and double knockout mice.
- Analysis using radiography, histochemistry, and immunohistochemistry at 4 weeks of age.
- Assessment of protein expression levels related to cell cycle regulation.
Main Results:
- Deletion of p16 significantly improved dental mineral density, volume, and dentin sialoprotein expression in Bmi1 knockout mice.
- Mandible growth was enhanced in double knockout mice, showing increased mineral density, cortical thickness, and osteoblast activity.
- Protein expression analysis indicated partial rescue of cell cycle regulators in double knockout mice compared to Bmi1 knockout mice.
Conclusions:
- The deletion of p16 can correct tooth and mandible growth retardation caused by Bmi1 deficiency.
- Bmi1 plays a critical role in regulating tooth and mandible development by inhibiting the p16 signaling pathway.
- The p16 pathway is involved in regulating cell cycle entry during tooth and mandible development.
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