| First Author | Kimura S | Year | 2022 |
| Journal | J Dent Res | Volume | 101 |
| Issue | 13 | Pages | 1637-1644 |
| PubMed ID | 35912776 | Mgi Jnum | J:331512 |
| Mgi Id | MGI:7388522 | Doi | 10.1177/00220345221111971 |
| Citation | Kimura S, et al. (2022) HIF-2alpha Inhibits Ameloblast Differentiation via Hey2 in Tooth Development. J Dent Res 101(13):1637-1644 |
| abstractText | Enamel is the highly mineralized outer layer of teeth; the cells responsible for enamel formation are ameloblasts. Local hypoxia and hypoxia inducible factor (HIF) in embryonic tissues are important to promote normal organogenesis. However, hypoxic state in tooth germs and the roles of HIF in ameloblast differentiation have not been understood. The aim of this study is to clarify the role of HIF in ameloblast differentiation during tooth germ development. We found that tooth germs were under hypoxia and HIF-1alpha and HIF-2alpha were expressed in tooth germs in embryonic mice. Then, we used HIF inhibitors to evaluate the function of HIF during tooth germ development. The HIF-2alpha inhibitor significantly decreased the size of tooth germs in organ culture, while the HIF-1alpha inhibitor did not apparently affect the size of tooth germs. The HIF-2alpha inhibitor enhanced the expression of amelogenin, a marker of ameloblast differentiation, in the tooth germs in organ culture and rat dental epithelial SF2 cells. Moreover, we found that the HIF-2alpha inhibitor-stimulating amelogenin expression was regulated by hes-related family basic helix-loop-helix transcription factor with YRPW motif 2(Hey2) in SF2 cells. These findings suggest that the HIF-2alpha-Hey2 axis plays an important role in ameloblast differentiation during tooth germ development. |
