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Related Experiment Video

Updated: Oct 21, 2025

A Mouse Distraction Osteogenesis Model
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Published on: November 14, 2018

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Sema3A accelerates bone formation during distraction osteogenesis in mice.

Nian Zhang1, Yunwei Hua1, Yunfeng Li1

  • 1State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.

Connective Tissue Research
|September 6, 2021
PubMed
Summary

Sema3A treatment significantly enhances bone regeneration and blood vessel formation during distraction osteogenesis (DO) in mice. This approach accelerates healing and improves the mechanical strength of newly formed bone, offering a promising therapeutic strategy.

Keywords:
Distraction osteogenesisangiogenesismicesemaphorin 3a

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Area of Science:

  • Orthopedics
  • Regenerative Medicine
  • Neuroscience

Background:

  • Distraction osteogenesis (DO) is a vital bone regeneration technique, but its clinical application is hindered by prolonged consolidation periods.
  • The interplay between the nervous system and bone regeneration is an emerging area of research.
  • Sema3A, a known axonal chemorepellent, exhibits bone-protective properties.

Purpose of the Study:

  • To investigate the efficacy of local Sema3A administration in improving distraction osteogenesis.
  • To explore the underlying mechanisms by which Sema3A influences bone regeneration and angiogenesis.

Main Methods:

  • Forty male wildtype mice underwent tibia osteotomy and distraction, with daily injections of Sema3A or saline into the distraction zone.
  • Micro-CT imaging, vascular density assessment, and biomechanical testing were performed at various time points up to 10 weeks.
  • In vitro angiogenesis assays were conducted to evaluate Sema3A's effect on vessel growth.

Main Results:

  • Sema3A treatment significantly accelerated bone regeneration, increased vascular density by 49%, and enhanced callus biomechanical strength compared to the saline group.
  • Bone volume fraction (BV/TV), bone mineral density (BMD), and tissue mineral density (TMD) increased by approximately 23%, 22%, and 18%, respectively.
  • Sema3A modulated VEGF-A and Ang-1 expression and suppressed VEGF-induced angiogenesis in vitro.

Conclusions:

  • Local administration of Sema3A effectively accelerates bone regeneration during distraction osteogenesis.
  • Sema3A improves angiogenesis and biomechanical properties of regenerated bone.
  • Sema3A presents a potential therapeutic agent for enhancing bone healing in DO.