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TGF-β1 autocrine signalling and enamel matrix components
Saeko Kobayashi-Kinoshita1, Yasuo Yamakoshi2, Kazuo Onuma3
1Department of Pediatric Dentistry, School of Dental Medicine, Tsurumi University, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama 230-8501, Japan.
Scientific Reports
|September 17, 2016
Summary
Transforming growth factor-β1 (TGF-β1) is vital for tooth enamel mineralization. Its activity is regulated by MMP20 and KLK4 proteases, with amelogenin fragments essential for TGF-β1 signaling during enamel formation.
Area of Science:
- Biochemistry
- Developmental Biology
- Mineralization
Background:
- Transforming growth factor-β1 (TGF-β1) is crucial for tooth enamel mineralization.
- Latent TGF-β1 is present in porcine enamel extracts and its mRNA is expressed throughout amelogenesis.
Purpose of the Study:
- To elucidate the regulatory mechanisms of TGF-β1 activity during amelogenesis.
- To investigate the role of amelogenin cleavage products in TGF-β1 signaling.
Main Methods:
- Analysis of latent TGF-β1 mRNA expression during amelogenesis.
- Investigating the interaction between TGF-β1, MMP20, KLK4, and amelogenin cleavage products.
- Studying the binding of the P103 amelogenin-TGF-β1 complex to TGFBR1.
Main Results:
- Latent TGF-β1 is activated by matrix metalloproteinase 20 (MMP20) during amelogenin processing.
- Activated TGF-β1 binds to P103 amelogenin, forming a complex that signals through TGFBR1.
- Kallikrein 4 (KLK4) cleaves the P103 amelogenin-TGF-β1 complex, reducing TGF-β1 activity in later enamel stages.
Conclusions:
- TGF-β1 activity during amelogenesis is precisely controlled by MMP20 and KLK4.
- Amelogenin cleavage products are essential for TGF-β1's solubility, receptor binding, and sustained activity.
- This intricate regulation ensures TGF-β1's proper function in tooth enamel development.
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