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Al Thamin S, Chiba Y, Yoshizaki K, Tian T, Jia L, Wang X, Saito K, Li J, Yamada A, Fukumoto S. Transcriptional regulation of the basic helix-loop-helix factor AmeloD during tooth development. J Cell Physiol 2021; 236:7533-7543. [PMID: 33844290 DOI: 10.1002/jcp.30389] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Revised: 03/25/2021] [Accepted: 03/30/2021] [Indexed: 02/05/2023]
Abstract
The epithelial-mesenchymal interactions are essential for the initiation and regulation of the development of teeth. Following the initiation of tooth development, numerous growth factors are secreted by the dental epithelium and mesenchyme that play critical roles in cellular differentiation. During tooth morphogenesis, the dental epithelial stem cells differentiate into several cell types, including inner enamel epithelial cells, which then differentiate into enamel matrix-secreting ameloblasts. Recently, we reported that the novel basic-helix-loop-helix transcription factor, AmeloD, is actively engaged in the development of teeth as a regulator of dental epithelial cell motility. However, the gene regulation mechanism of AmeloD is still unknown. In this study, we aimed to uncover the mechanisms regulating AmeloD expression during tooth development. By screening growth factors that are important in the early stages of tooth formation, we found that TGF-β1 induced AmeloD expression and ameloblast differentiation in the dental epithelial cell line, SF2. TGF-β1 phosphorylated ERK1/2 and Smad2/3 to induce AmeloD expression, whereas treatment with the MEK inhibitor, U0126, inhibited AmeloD induction. Promoter analysis of AmeloD revealed that the proximal promoter of AmeloD showed high activity in dental epithelial cell lines, which was enhanced following TGF-β1 stimulation. These results suggested that TGF-β1 activates AmeloD transcription via ERK1/2 phosphorylation. Our findings provide new insights into the mechanisms that govern tooth development.
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Affiliation(s)
- Shahad Al Thamin
- Department of Oral Health and Development Sciences, Division of Pediatric Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - Yuta Chiba
- Department of Oral Health and Development Sciences, Division of Pediatric Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
- Section of Oral Medicine for Children, Division of Oral Health, Growth and Development, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Keigo Yoshizaki
- Section of Orthodontics and Dentofacial Orthopedics, Division of Oral Health, Growth and Development, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - Tian Tian
- Section of Orthodontics and Dentofacial Orthopedics, Division of Oral Health, Growth and Development, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
| | - LingLing Jia
- Department of Oral Health and Development Sciences, Division of Pediatric Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Xin Wang
- Department of Oral Health and Development Sciences, Division of Pediatric Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
- Department of Pediatric Dentistry, Peking University School and Hospital of Stomatology, Beijing, China
| | - Kan Saito
- Department of Oral Health and Development Sciences, Division of Pediatric Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - Jiyao Li
- Department of Oral Health and Development Sciences, Division of Pediatric Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Department of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Aya Yamada
- Department of Oral Health and Development Sciences, Division of Pediatric Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - Satoshi Fukumoto
- Department of Oral Health and Development Sciences, Division of Pediatric Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
- Section of Oral Medicine for Children, Division of Oral Health, Growth and Development, Faculty of Dental Science, Kyushu University, Fukuoka, Japan
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