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Transgenic expression of dentin phosphoprotein inhibits skeletal development.

H Zhang1, P Liu, S Wang

  • 1Texas A&M University, Baylor College of Dentistry. hzhang@bcd.tamhsc.edu.

European Journal of Histochemistry : EJH
|March 15, 2016
PubMed
Summary

Overexpressing dentin phosphoprotein (DPP) in mice stunts skeletal growth and reduces bone formation. Balanced actions of DSPP fragments are crucial for normal bone development.

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Area of Science:

  • Skeletal Biology
  • Biochemistry
  • Genetics

Background:

  • Dentin sialophosphoprotein (DSPP) yields dentin sialoprotein (DSP) and dentin phosphoprotein (DPP).
  • DSP and DPP are thought to have distinct roles in bone and dentin formation.
  • The specific function of DPP in skeletal development requires further investigation.

Purpose of the Study:

  • To investigate the role of dentin phosphoprotein (DPP) in skeletal development.
  • To analyze the effects of DPP overexpression on bone formation and growth.

Main Methods:

  • Generated transgenic mice (Col1a1-HA-DPP) overexpressing hemagglutinin (HA)-tagged DPP.
  • Utilized X-ray radiography and histological analyses to assess skeletal phenotypes.
  • Examined growth plate morphology and chondrocyte proliferation/differentiation.

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Main Results:

  • Col1a1-HA-DPP transgenic mice exhibited reduced body weight, smaller skeletons, and shorter long bones.
  • Trabecular bone formation was decreased, with narrower proliferative and hypertrophic chondrocyte zones.
  • Reduced chondrocyte proliferation was observed, but differentiation remained largely unaffected.
  • High transgene expression led to spontaneous long bone fractures.

Conclusions:

  • Overexpression of DPP significantly inhibits skeletal development.
  • A balance between DSPP's NH2-terminal (DSP) and COOH-terminal (DPP) fragments is essential for normal skeletal development.