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Author Spotlight: Comparing Alveolar and Long Bone Remodeling to Explore OTM Model Potential
Published on: July 21, 2023
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mTORC1 signaling pathway regulates tooth repair.
Honghong Liu1,2,3,4, Yu Yue1,2,3,4, Zhiyun Xu1,2,3,4
1Department of Endodontics, Stomatological Hospital of Chongqing Medical University, Chongqing, China.
International Journal of Oral Science
|March 17, 2023
Summary
Researchers developed a new tooth germ injury model to study repair mechanisms. They discovered that mTORC1 signaling is crucial for tooth germ repair, offering a potential clinical treatment target.
Area of Science:
- Developmental Biology
- Regenerative Medicine
- Oral Biology
Background:
- Tooth germ injury impacts oral health, affecting tooth development, form, function, and appearance.
- Limited research exists on the cellular and molecular mechanisms of tooth germ repair.
- Establishing a reliable tooth germ injury model is vital for understanding repair processes.
Purpose of the Study:
- To construct a stable and repeatable tooth germ injury model for studying repair mechanisms.
- To investigate the cellular and molecular pathways involved in tooth germ repair.
- To identify potential therapeutic targets for tooth germ injury.
Main Methods:
- Construction of a Tg(dlx2b:Dendra2-NTR) transgenic line for specific tooth germ labeling.
- Utilizing the NTR/Mtz system for targeted depletion of dlx2b+ tooth germ cells.
- Evaluation of tooth germ repair using antibody staining, in situ hybridization, EdU staining, and alizarin red staining.
- In vitro and in vivo manipulation of mTORC1 signaling pathways.
Main Results:
- A stable and repeatable model for severe tooth germ injury repair was successfully established.
- Tooth germ repair occurred within days after Mtz treatment cessation.
- Activation of mTORC1 signaling (indicated by increased phosphorylated 4E-BP1) was observed during early tooth germ repair.
- Inhibition or knockdown of mTORC1 signaling impaired tooth germ repair, while its promotion enhanced repair in mouse incisors.
Conclusions:
- The study presents the first stable and repeatable model for severe tooth germ injury repair.
- mTORC1 signaling plays a critical role in the tooth germ repair process.
- Targeting mTORC1 signaling presents a potential therapeutic strategy for clinical treatment of tooth germ injuries.
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