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Immune-derived opioids and peripheral antinociception.

P J Cabot1

  • 1The School of Pharmacy, The University of Queensland, St Lucia, Australia. pcabot@pharmacy.uq.edu.au

Clinical and Experimental Pharmacology & Physiology
|March 10, 2001
PubMed
Summary

The immune system, particularly lymphocytes, produces and releases opioid peptides that help control inflammatory pain. Immune cell migration to inflamed tissues is crucial for this pain-modulating effect.

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Area of Science:

  • Immunology
  • Neuroscience
  • Pain Research

Background:

  • Recent findings suggest a significant role for the immune system in pain control.
  • Immune cells, including lymphocytes, produce and release endogenous opioid peptides.
  • These peptides interact with opioid receptors on peripheral sensory nerve endings.

Purpose of the Study:

  • To review the involvement of the immune system in the site-directed control of inflammatory pain.
  • To highlight the link between immune cell migration and inflammatory pain.

Main Methods:

  • Review of existing literature on immune cell function and pain pathways.
  • Analysis of studies investigating opioid precursor protein expression in immune cells.
  • Examination of the role of cytokines and corticotropin-releasing factor (CRF) in opioid release from immune cells.

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Main Results:

  • Immune cells express mRNA for opioid precursor proteins, with increased expression in stimulated lymphocytes and those from inflamed animals.
  • Cytokines and CRF stimulate opioid release from immune cells, mediating peripheral analgesia.
  • Activated immune cells, particularly memory T cells expressing beta-endorphin, migrate to inflamed tissues, contributing to pain control.

Conclusions:

  • The immune system plays an integral role in modulating inflammatory pain through endogenous opioid production and release.
  • Immune cell migration to sites of inflammation is a key mechanism in this pain control pathway.
  • Immunosuppression is linked to increased pain sensitivity and reduced analgesia.