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Discoidin Domain Receptor 2 Is Required for Tooth Extraction Socket Healing.

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Exogenous bone sialoprotein improves extraction socket healing in Ibsp knockout and wild-type mice.

M B Chavez1, N L Andras2, M H Tan2

  • 1Division of Biosciences, College of Dentistry, The Ohio State University, Columbus, OH, USA; College of Dentistry, University of Iowa, Iowa City, IA, USA.

Bone
|December 26, 2024
PubMed
Summary

Bone sialoprotein (BSP) administration significantly improved alveolar bone healing in mice lacking BSP and enhanced healing in normal mice. This suggests BSP is a promising therapeutic for bone regeneration.

Keywords:
Bone biologyBone remodeling/regenerationExtracellular matrix (ECM)Mineralized tissue/developmentOsteoblast(s)

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Oral and Maxillofacial Surgery

Background:

  • Bone sialoprotein (BSP) is a key extracellular matrix protein crucial for bone formation and mineralization.
  • Mice lacking BSP (Ibsp knockout) display impaired alveolar bone development and healing.
  • The potential of exogenous BSP to restore defective alveolar bone healing remains largely unexplored.

Purpose of the Study:

  • To investigate whether exogenous bone sialoprotein (BSP) can rescue defective alveolar bone healing in Ibsp knockout mice.
  • To evaluate the effects of native rat BSP (nBSP) and recombinant rat BSP (rBSP) on bone regeneration.
  • To compare the efficacy of BSP administration in both Ibsp knockout and wild-type mice.

Main Methods:

  • Native rat BSP (nBSP) or recombinant rat BSP (rBSP) in collagen gel was applied to molar extraction sockets in Ibsp knockout and wild-type mice.
  • Bone healing was assessed at various time points using micro-computed tomography, histology, and immunohistochemistry.
  • Gene expression analysis was performed to understand the molecular mechanisms underlying BSP's effects.

Main Results:

  • Both nBSP and rBSP significantly increased bone volume fraction and bone mineral density in Ibsp knockout mice at 14 days post-procedure.
  • Exogenous BSP also enhanced bone healing in wild-type mice, increasing bone volume and density.
  • Recombinant BSP (rBSP) modulated genes related to cell signaling, extracellular matrix, mineralization, and osteoblast/osteoclast activity, while nBSP had minimal effects on gene expression.

Conclusions:

  • Exogenous bone sialoprotein (BSP) effectively rescues defective alveolar bone healing in Ibsp knockout mice.
  • BSP administration enhances bone healing in both deficient and normal physiological states.
  • These findings highlight BSP as a potential therapeutic agent for improving bone quantity and quality in socket healing.