Abstract
Adult Cebpb KO mice incisors present amelogenin-positive epithelium pearls, enamel and dentin allopathic hyperplasia, fewer Sox2-positive cells in labial cervical loop epitheliums, and reduced Sox2 expression in enamel epithelial stem cells. Thus, Cebpb acts upstream of Sox2 to regulate stemness. In this study, Cebpb KO mice demonstrated cementum-like hard tissue in dental pulp, loss of polarity by ameloblasts, enamel matrix in ameloblastic layer, and increased expression of epithelial-mesenchymal transition (EMT) markers in a Cebpb knockdown mouse enamel epithelial stem cell line. Runx2 knockdown in the cell line presented a similar expression pattern. Therefore, the EMT enabled disengaged odontogenic epithelial stem cells to develop supernumerary teeth. Cebpb and Runx2 knockdown in the cell line revealed higher Biglycan and Decorin expression, and Decorin-positive staining in the periapical region, indicating their involvement in supernumerary tooth formation. Cebpb and Runx2 acted synergistically and played an important role in the formation of supernumerary teeth in adult incisors.
Highlights
We concluded that odontogenic epithelial stem cells (OESCs) within the labial cervical loop epithelium lost their stemness in Cebpb−/− mice
There were significantly fewer Sox2-positive cells in the labial cervical loop epithelium of adult Cebpb−/− mouse incisors than in wild-type animals (Fig. 1J–N). These findings suggest that Cebpb maintains Sox2-positive OESCs in the labial cervical loop epithelium during postnatal life
We previously reported that uterine sensitization-associated gene-1 (Usag-1) and Runx[2] acted in an antagonistic manner in lingual bud formation at embryonic day 15 (E15)[16]
Summary
The images or other third party material in this article are included in the article s Creative Commons license, unless indicated otherwise in a credit line to the material. Sox[2] expression in enamel epithelial stem cells. Cebpb KO mice demonstrated cementum-like hard tissue in dental pulp, loss of polarity by ameloblasts, enamel matrix in ameloblastic layer, and increased expression of epithelialmesenchymal transition (EMT) markers in a Cebpb knockdown mouse enamel epithelial stem cell line. Cebpb and Runx[2] knockdown in the cell line revealed higher Biglycan and Decorin expression, and Decorin-positive staining in the periapical region, indicating their involvement in supernumerary tooth formation. Cebpb and Runx[2] acted synergistically and played an important role in the formation of supernumerary teeth in adult incisors
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