Beta-catenin/LEF1 activated enamelin expression in ameloblast-like cells.


Enamelin is an ameloblast-specific matrix protein believed to play essential roles in enamel formation. However, mechanisms of enamelin transcription regulation are not clear. beta-Catenin/LEF1 is a key transcriptional complex involved in tooth development. In this study, the role of beta-catenin/LEF1 in enamelin expression was investigated. The 5'-flanking region of the mouse enamelin gene was analyzed and cloned. Co-transfection analysis and mutation assays revealed that two conserved LEF1 responsive elements located at -1002 and -597bp upstream of the enamelin translation initiation site could augment transcriptional activity of the enamelin. The interaction between the enamelin elements and beta-catenin/LEF1 was further confirmed by electrophoresis mobility shift assays and chromatin immunoprecipitation assays. In addition, LiCl treatment induced nuclear translocation of beta-catenin and elevated endogenous enamelin expression in mouse ameloblast-like cells. The results suggested that Wnt/beta-catenin signaling could function in enamelin gene expression by direct interaction through two conserved LEF1 responsive elements on the enamelin gene in ameloblast-like cells.

DOI: 10.1016/j.bbrc.2010.06.111

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@article{Tian2010BetacateninLEF1AE, title={Beta-catenin/LEF1 activated enamelin expression in ameloblast-like cells.}, author={Hua Tian and Ping Lv and Kangtao Ma and Chunyan Zhou and Xuejun Gao}, journal={Biochemical and biophysical research communications}, year={2010}, volume={398 3}, pages={519-24} }