Transforming Growth Factor-Beta Signaling Regulates Tooth Root Dentinogenesis By Cooperation With Wnt Signaling
FRONTIERS IN CELL AND DEVELOPMENTAL BIOLOGY(2021)
摘要
Proper differentiation of odontoblasts is crucial for the development of tooth roots. Previous studies have reported the osteogenic/odontogenic potential of pre-odontoblasts during root odontoblast differentiation. However, the underlying molecular pathway that orchestrates these processes remains largely unclear. In this study, ablation of transforming growth factor-beta receptor type 2 (Tgfbr2) in root pre-odontoblasts resulted in abnormal formation of root osteodentin, which was associated with ectopic osteogenic differentiation of root odontoblasts. Disrupting TGF-beta signaling caused upregulation of Wnt signaling characterized by increased Wnt6, Wnt10a, Tcf-1, and Axin2 expression. Interestingly, inhibiting Wnt signaling by deleting Wntless (wls) in Osteocalcin (Ocn)-Cre; Tgfbr2(fl/fl); Wls(fl/fl) mice or overexpressing the Wnt antagonist Dkk1 in Ocn-Cre; Tgfbr2(fl/fl); ROSA26(Dkk1) mice decreased ectopic osteogenic differentiation and arrested odontoblast differentiation. Our results suggest that TGF-beta signaling acts with Wnt signaling to regulate root odontogenic differentiation.
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关键词
TGF-beta type II receptor, Wntless, tooth root, odontoblast, dentin
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