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Mirror-Image Pain Update: Complex Interactions Between Central and Peripheral Mechanisms.

Višnja Drinovac Vlah1, Lidija Bach-Rojecky2

  • 1Department of Pharmacology, University of Zagreb Faculty of Pharmacy and Biochemistry, Domagojeva 2, 10000, Zagreb, Croatia.

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Summary

Mirror-image pain (MP) involves contralateral effects after unilateral injury. Recent evidence suggests peripheral nervous system (PNS) mechanisms play a significant role in MP induction, challenging previous central sensitization theories.

Keywords:
Central sensitizationMirror-image painPeripheral nervous systemSatellite glial cellsSymmetry

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Area of Science:

  • Neuroscience
  • Pain Research
  • Peripheral Nervous System Biology

Background:

  • Contralateral effects, including mirror-image pain (MP), occur after unilateral injuries in clinical and experimental settings.
  • MP is characterized by pain spreading to the opposite side of the body, involving peripheral nerves, ganglia, or the spinal cord.
  • While central sensitization is the traditional explanation, the role of the peripheral nervous system (PNS) in MP is increasingly recognized.

Purpose of the Study:

  • To synthesize current knowledge on the mirror-image pain (MP) phenomenon.
  • To review and highlight emerging evidence for peripheral mechanisms underlying MP.
  • To provide a comprehensive overview of MP induction and maintenance.

Main Methods:

  • Literature review and synthesis of existing research on mirror-image pain.
  • Analysis of studies investigating structural, molecular, and functional changes in the peripheral nervous system following injury.
  • Focus on evidence supporting peripheral nervous system involvement in MP.

Main Results:

  • Mirror-image pain (MP) is a complex phenomenon with diverse manifestations in the peripheral and central nervous systems.
  • Contrary to previous assumptions, the peripheral nervous system (PNS) shows evidence of contributing significantly to MP induction.
  • Molecular and functional changes within the PNS are implicated in the development and persistence of contralateral pain.

Conclusions:

  • The understanding of mirror-image pain (MP) mechanisms needs to incorporate peripheral nervous system (PNS) contributions.
  • Peripheral mechanisms offer a novel perspective on the development of contralateral pain.
  • Further research into PNS involvement is crucial for a complete understanding of MP.