Wnt10a regulates dentin sialophosphoprotein mRNA expression and possibly links odontoblast differentiation and tooth morphogenesis

Takashi Yamashiro, Li Zheng, Yuko Shitaku, Masahiro Saito, Takanori Tsubakimoto, Kenji Takada, Teruko Takano-Yamamoto, Irma Thesleff

Research output: Contribution to journalArticlepeer-review

100 Citations (Scopus)

Abstract

We have explored the role of Wnt signaling in dentinogenesis of mouse molar teeth. We found that Wnt10a was specifically associated with the differentiation of odontoblasts and that it showed striking colocalization with dentin sialophosphoprotein (Dspp) expression in secretory odontoblasts. Dspp is a tooth specific non-collagenous matrix protein and regulates dentin mineralization. Transient overexpression of Wnt10 in C3H10T1/2, a pluripotent fibroblast cell line induced Dspp mRNA. Interestingly, this induction occurred only when transfected cells were cultured on Matrigel basement membrane extracts. These findings indicated that Wnt10a is an upstream regulatory molecule for Dspp expression, and that cell-matrix interaction is essential for induction of Dspp expression. Furthermore, Wnt10a was specifically expressed in the epithelial signaling centers regulating tooth development, the primary and secondary enamel knots. The spatial and temporal distribution of Wnt10a mRNA demonstrated that the expression shifts from the secondary enamel knots, to the underlying preodontoblasts in the tips of future cusps. The expression patterns and overexpression studies together indicate that Wnt10a is a key molecule for dentinogenesis and that it is associated with the cell-matrix interactions regulating odontoblast differentiation. We conclude that Wnt10a may link the differentiation of odontoblasts and cusp morphogenesis.

Original languageEnglish
Pages (from-to)452-462
Number of pages11
JournalDifferentiation
Volume75
Issue number5
DOIs
Publication statusPublished - 2007 Jun
Externally publishedYes

Keywords

  • Dentinogenesis
  • Dspp
  • Odontoblast
  • Tooth
  • Wnt10a

ASJC Scopus subject areas

  • Molecular Biology
  • Developmental Biology
  • Cell Biology
  • Cancer Research

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