Dentin sialoprotein and dentin phosphoprotein have distinct roles in dentin mineralization

Shigeki Suzuki, Taduru Sreenath, Naoto Haruyama, Cherlita Honeycutt, Anita Terse, Andrew Cho, Thomas Kohler, Ralph Müller, Michel Goldberg, Ashok B. Kulkarni

Research output: Contribution to journalArticlepeer-review

146 Citations (Scopus)

Abstract

Dentin sialophosphoprotein (DSPP), a major non-collagenous matrix protein of odontoblasts, is proteolytically cleaved into dentin sialoprotein (DSP) and dentin phosphoprotein (DPP). Our previous studies revealed that DSPP null mice display a phenotype similar to human autosomal dominant dentinogenesis imperfecta, in which teeth have widened predentin and irregular dentin mineralization resulting in sporadic unmineralized areas in dentin and frequent pulp exposure. Earlier in vitro studies suggested that DPP, but not DSP, plays a significant role in initiation and maturation of dentin mineralization. However, the precise in vivo roles of DSP and DPP are far from clear. Here we report the generation of DPPcKO mice, in which only DSP is expressed in a DSPP null background, resulting in a conditional DPP knockout. DPPcKO teeth show a partial rescue of the DSPP null phenotype with the restored predentin width, an absence of irregular unmineralized areas in dentin, and less frequent pulp exposure. Micro-computed tomography (micro-CT) analysis of DPPcKO molars further confirmed this partial rescue with a significant recovery in the dentin volume, but not in the dentin mineral density. These results indicate distinct roles of DSP and DPP in dentin mineralization, with DSP regulating initiation of dentin mineralization, and DPP being involved in the maturation of mineralized dentin.

Original languageEnglish
Pages (from-to)221-229
Number of pages9
JournalMatrix Biology
Volume28
Issue number4
DOIs
Publication statusPublished - 2009 May
Externally publishedYes

Keywords

  • Biomineralization
  • Chondroitin sulfate proteoglycan
  • Dentin mineral density
  • Dentin sialophosphoprotein
  • Dentin volume

ASJC Scopus subject areas

  • Molecular Biology

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