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Updated: Jul 25, 2025

A Mouse Distraction Osteogenesis Model
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PRRX1+MSCs Enhance Mandibular Regeneration during Distraction Osteogenesis.

W D Jiang1,2,3,4,5,6,7,8,9, P Q Zhu1,2,3, T Zhang1,2,3

  • 1Department of Oral and Maxillofacial Surgery, Hospital of Stomatology, Guangxi Medical University, Nanning, P. R. China.

Journal of Dental Research
|June 30, 2023
PubMed
Summary

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This summary is machine-generated.

Distraction osteogenesis (DO) enhances bone regeneration by maintaining paired related homeobox 1-expressing mesenchymal stem cells (MSCs) in an embryonic-like state. Knocking out PRRX1 in MSCs significantly impairs jawbone regeneration.

Area of Science:

  • Regenerative Medicine
  • Orthopedic Surgery
  • Stem Cell Biology

Background:

  • Bone defects (BD) cause significant physical limitations.
  • Distraction osteogenesis (DO) is effective for bone regeneration, but its mechanism is unclear.
  • Understanding cellular mechanisms in DO is crucial for improving bone defect treatments.

Purpose of the Study:

  • To elucidate the cellular mechanisms underlying bone regeneration in distraction osteogenesis.
  • To compare cellular differences between distraction osteogenesis and bone defect calluses.
  • To identify key cell populations and molecular pathways involved in DO-mediated bone regeneration.

Main Methods:

  • Established canine models for distraction osteogenesis (DO) and bone defects (BD).
Keywords:
CRISPR-Cas9 systembone regenerationjawmechanotransductionmesenchymal stem cellssingle-cell RNA sequencing

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  • Utilized micro-computed tomography, histological staining, and single-cell RNA sequencing.
  • Isolated and characterized mesenchymal stem cells (MSCs); employed CRISPR/Cas9 for gene knockout.

    • Main Results:

    • DO significantly increased mineralized bone volume and new bone formation compared to BD.
    • Mesenchymal stem cells (MSCs) from DO calluses exhibited stronger osteogenic capability than those from BD.
    • Identified 6 major cell populations, including PRRX1+ MSCs, with specific subpopulations expressing neural crest cell markers in DO.

    Conclusions:

    • PRRX1+ MSCs, particularly those maintaining an embryonic-like state via continuous distraction, are essential for jawbone regeneration.
    • Loss of PRRX1 function in MSCs blunts osteogenesis, migration, and proliferation, impairing bone regeneration.
    • This study provides a cellular atlas of DO regeneration, highlighting the critical role of PRRX1+ MSCs.