Abstract：
:Hedgehog (Hh) signaling plays a broad role in the development of many organs including bone and teeth. It is noted that sustained Hh activity in osteoblasts negatively regulates postnatal development in mice. However, it remains unknown whether Hh signaling contributes to cementum formation. In this study, to define the roles of Hh signaling in cementum formation, we analyzed two kinds of transgenic mouse models for Hh signaling activation designed by the inactivation of Suppressor of Fused (Sufu), a negative regulator of Hh signaling, (SufuOC) and a forced endogenous activation of Smo (SmoM2OC) under the control of osteocalcin (OC) promoter-driven Cre recombinase. Interestingly, cellular cementum apposition was remarkably reduced in both mutants. Consistently, matrix formation and mineralization ability were down-regulated in OCCM-30, a cementoblast cell line, following treatment with a pharmaceutical Smo agonist. In addition, reductions in Osx expression and β-catenin activity, which are critical for cellular cementum formation, were also detected in vitro. Furthermore, the compound mutant mice designed for the stabilization of β-catenin with both Hh-Smo signaling activation in cementoblasts revealed a complete restoration of defective cellular cementum. In addition, Wnt antagonists such as Sostdc1 and Dkk1 were also induced by Smo activation and played a role in the reduction of Osx expression and β-catenin activity. Collectively, our data demonstrated that Hh signaling negatively regulates cementum apposition in a Wnt/β-catenin/Osx-dependent manner.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Choi H,Liu Y,Yang L,Cho ESdoi
10.1038/s41598-020-64188-wsubject
Has Abstractpub_date
2020-04-29 00:00:00pages
7285issue
1issn
2045-2322pii
10.1038/s41598-020-64188-wjournal_volume
10pub_type
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