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Related Experiment Video

Updated: Feb 8, 2026

Transplantation of Olfactory Ensheathing Cells to Evaluate Functional Recovery after Peripheral Nerve Injury
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Temporal changes in macrophage phenotype after peripheral nerve injury.

Joy E Tomlinson1, Emilija Žygelytė1, Jennifer K Grenier1

  • 1Cornell University College of Veterinary Medicine, Ithaca, NY, USA.

Journal of Neuroinflammation
|June 17, 2018
PubMed
Summary

Macrophages are crucial for nerve repair, exhibiting diverse phenotypes. Modulating their polarization via IL4 and IFNγ receptors impacts gene expression but not functional recovery after peripheral nerve injury.

Keywords:
Gene expressionMacrophageNerve injuryRegeneration

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Area of Science:

  • Neuroscience
  • Immunology
  • Regenerative Medicine

Background:

  • Macrophages are vital for peripheral nerve repair.
  • Their phenotypes are influenced by microenvironmental signals.
  • Understanding macrophage behavior is key to improving nerve regeneration.

Purpose of the Study:

  • To analyze temporal changes in macrophage gene expression during nerve repair.
  • To investigate the impact of interleukin-4 (IL4) and interferon-gamma (IFNγ) on macrophage phenotype and nerve regeneration.
  • To assess the role of IL4 and IFNγ receptors in peripheral nerve recovery.

Main Methods:

  • RNA sequencing and NanoString technology were used to profile macrophage gene expression.
  • Fluorescence-activated cell sorting (FACS) isolated macrophages from injured nerves.
  • Gene expression changes and nerve regeneration were assessed in mice lacking IL4 or IFNγ receptors.

Main Results:

  • Deletion of IL4 and IFNγ receptors altered gene expression related to angiogenesis and axonal growth.
  • Complementary responses were observed between IL4R and IFNγR deletions.
  • No significant influence on functional recovery from peripheral nerve transection was observed at 8 weeks.

Conclusions:

  • The study provides a framework for evaluating macrophage phenotypes over time.
  • Macrophage polarization influences specific gene expression pathways.
  • Further research into modulating macrophage polarization may enhance nerve repair strategies.