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Regeneration and repair processes are critical in healing damages caused by injury, disease, and aging. In regeneration, the damaged tissue is entirely replaced with new growth that restores the original architecture and function. In contrast, tissue repair usually results in a fixed tissue architecture involving scar formation. Scars generally do not reestablish tissue function and may also exhibit structural abnormalities at the injury site.
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Early Ischemia and Ionic ImbalanceWithin minutes of spinal cord injury, a secondary cascade begins, progressing over hours to weeks. Vascular damage reduces blood flow, causing ischemia and mitochondrial dysfunction. ATP depletion leads to ion pump failure, membrane depolarization, sodium influx, potassium efflux, and water accumulation, resulting in cellular swelling. Increased intracellular calcium further disrupts mitochondria and accelerates cellular injury.Excitotoxicity and Neuronal...
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Spinal cord injury progresses through two interconnected phases: primary injury and secondary injury.Primary InjuryPrimary injury happens at the moment of trauma and involves immediate mechanical damage to the spinal cord.Compression happens when broken vertebrae, herniated discs, or accumulating blood (such as a hematoma) press directly against the spinal cord, distorting its normal shape and function. In cases of contusion, the cord is bruised by a blunt force (like penetrating injuries or...
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Peripheral Nervous System: Ganglia and Nerves01:24

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Updated: Apr 30, 2026

Traumatic Peripheral Nerve Injury in Mice
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Traumatic Peripheral Nerve Injury in Mice

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Revisiting the Peripheral Nerve Injury and Regeneration.

Zhen-Gang Liu1, Yun-Long Zou1, Min-Xin Zhang2

  • 1Department of Orthopaedics, China-Japan Union Hospital of Jilin University, 130033, Changchun, China.

Neuromolecular Medicine
|April 28, 2026
PubMed
Summary
This summary is machine-generated.

Peripheral nerve injury (PNI) hinders recovery. This review explores strategies to improve nerve regeneration by enhancing intrinsic growth, the repair environment, and nerve reconnection for better patient outcomes.

Keywords:
ExosomesNerve guide conduitsNerve repairPeripheral nerve injurySignalling pathways

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Area of Science:

  • Regenerative Medicine
  • Neuroscience
  • Biomedical Engineering

Background:

  • Peripheral nerve injury (PNI) leads to significant disability and poor functional recovery.
  • Current treatments often fail to achieve desired outcomes, highlighting an unmet clinical need.
  • PNI presents complex challenges in nerve regeneration and functional restoration.

Purpose of the Study:

  • To review current and emerging strategies for peripheral nerve injury repair.
  • To analyze PNI treatment from the perspectives of intrinsic axonal growth, the repair environment, and nerve reconnection.
  • To highlight innovative treatments for critical nerve lesions to improve clinical outcomes.

Main Methods:

  • Review of experimental models and clinical studies on PNI treatment.
  • Analysis of signaling pathways, neuromodulatory factors, and cellular roles (Schwann cells, macrophages).
  • Exploration of surgical interventions, drug-based therapies, and novel technological approaches.

Main Results:

  • PNI repair requires enhancing intrinsic axonal growth capacity.
  • Optimizing the injury microenvironment, including immune modulation, is crucial for regeneration.
  • Successful nerve reconnection and prevention of distal tissue degeneration are key to functional recovery.

Conclusions:

  • A multi-faceted approach is needed to address PNI, focusing on intrinsic repair mechanisms and the extrinsic environment.
  • Innovative treatments are essential for critical nerve lesions to overcome current limitations.
  • Further research into advanced strategies promises improved functional outcomes for PNI patients.