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Dentin Sialoprotein/Phosphophoryn (DSP/PP) as Bio-Inductive Materials for Direct Pulp Capping.

Shu-Fen Chuang1,2, Yu-Hsuan Chen2, Peter X Ma3

  • 1School of Dentistry and Institute of Oral Medicine, National Cheng Kung University, No. 1 Universal Road, Tainan 70101, Taiwan.

Polymers
|September 9, 2022
PubMed
Summary

Phosphophoryn (PP) and dentin sialoprotein (DSP) show promise as pulp capping agents. These proteins promote cell migration and reparative dentin formation with less inflammation than traditional calcium hydroxide treatments.

Keywords:
RNA interferencedentin sialoproteinphosphophorynpulp cappingregenerationreparative dentin

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Area of Science:

  • Biomaterials Science
  • Regenerative Dentistry
  • Dental Pulp Biology

Background:

  • Conventional pulp capping materials like calcium hydroxide (Ca(OH)2) can cause inflammation.
  • Dentin matrix proteins, phosphophoryn (PP) and dentin sialoprotein (DSP), are crucial for dentin mineralization and pulp cell activity.

Purpose of the Study:

  • To investigate PP and DSP/PP as novel bio-inductive pulp capping agents.
  • To evaluate their efficacy in promoting pulp regeneration and reparative dentin formation in vitro and in vivo.

Main Methods:

  • Agarose bead assay to assess PP dose effects on cell migration and protein expression.
  • RT-PCR to analyze recombinant DSP (recDSP) and recDSP/PP effects on DSP-PP transcript expression.
  • RNA interference (RNAi) to study DSPP function in mineralization.
  • Ferret animal models for in vivo pulp response and reparative dentin formation assessment.

Main Results:

  • An intermediate dose of PP optimally enhanced cell migration and differentiation.
  • recDSP/PP significantly boosted DSP-PP transcript expression.
  • Inhibition of DSPP mRNA impaired dental pulp cell mineralization.
  • In vivo studies showed PP and recDSP/PP induced less inflammation and more reparative dentin formation compared to Ca(OH)2.

Conclusions:

  • DSP and PP demonstrate potential as effective pulp capping agents.
  • These proteins offer a less inflammatory alternative to conventional treatments, promoting natural pulp repair.