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Updated: Sep 14, 2025

Traumatic Peripheral Nerve Injury in Mice
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Etv5 Is Required for Peripheral Nerve Function and the Injury Response.

Lauren Belfiore1,2, Anjali Balakrishnan1,3,4, Yohannes Soenjaya1

  • 1Sunnybrook Research Institute, Toronto, Ontario M4N 3M5, Canada.

Eneuro
|July 23, 2025
PubMed
Summary
This summary is machine-generated.

Etv5 is crucial for mature peripheral nerve function and repair, impacting Schwann cell regulation and axonal integrity with age. It is not essential for initial Schwann cell development.

Keywords:
Etv5Schwann cell maturationSchwann cell repairSchwann cellsdevelopmentperipheral nerve injury

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Developmental Biology

Background:

  • Schwann cell myelination is vital for peripheral nervous system function.
  • MEK/ERK signaling regulates Schwann cell development.
  • Ets-domain transcription factors (Etv1, Etv4, Etv5) are downstream of this pathway, with Etv1 previously linked to Schwann cell development.

Purpose of the Study:

  • To investigate the role of Etv5 in Schwann cell function, particularly in mature and aging peripheral nerves.
  • To determine Etv5's necessity for Schwann cell differentiation and its involvement in nerve repair and maintenance.

Main Methods:

  • Generation of Etv5 conditional knock-out (cKO) mice using a Sox10-Cre driver.
  • Analysis of Schwann cell numbers, sciatic nerve structure (transmission electron microscopy), and gastrocnemius muscle morphology in juvenile and adult mice.
  • Assessment of motor behavior after peripheral nerve crush injury.

Main Results:

  • Etv5 is not essential for embryonic Schwann cell differentiation.
  • Etv5-cKO mice showed increased Schwann cell numbers post-injury in juveniles, but this response was attenuated by adulthood.
  • Naive sciatic nerves in Etv5-cKO mice exhibited reduced axonal diameter and myelination defects.
  • Muscle atrophy was observed in Etv5-cKO mice, indicating nerve structural abnormalities.
  • Motor behavior after injury was not significantly affected by Etv5 deficiency.

Conclusions:

  • Etv5 plays a critical role in the age-dependent regulation of Schwann cell function.
  • Etv5 is essential for peripheral nerve repair and maintaining axonal integrity in mature nerves.
  • While not required for initial differentiation, Etv5 is crucial for long-term Schwann cell health and function.