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Related Experiment Videos

Morphine-induced decrease in mechanical allodynia is mediated by central, but not peripheral, opioid receptors in

Shao Li1, Zhi-Qi Zhao

  • 1Institute of Neurobiology, Fudan University, Shanghai 200433, China.

European Journal of Pharmacology
|December 4, 2003
PubMed
Summary

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Morphine effectively reduces pain sensitivity in inflamed rats by targeting specific nerve fibers. This study reveals how morphine alleviates allodynia through central nervous system mechanisms and persistent inflammation pain via peripheral opioid receptors.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Pain Research

Background:

  • Inflammation-induced pain and allodynia are significant clinical challenges.
  • Opioid analgesics like morphine are widely used but their precise mechanisms in inflammatory pain are not fully elucidated.

Purpose of the Study:

  • To investigate the underlying mechanisms of morphine's effect on allodynia in Complete Freund's Adjuvant (CFA)-induced inflammation in rats.
  • To differentiate between central and peripheral actions of morphine in alleviating inflammatory pain.

Main Methods:

  • Utilized a Complete Freund's Adjuvant (CFA) rat model of inflammatory pain.
  • Administered morphine intravenously and assessed its antinociceptive effects on mechanical allodynia.
  • Used naloxone to block opioid receptors and confirm morphine's mechanism.

Related Experiment Videos

  • Performed teased fiber recordings from the tibial nerve to analyze nerve fiber activity (A-type and C-type fibers).

    • Main Results:

    • Morphine significantly inhibited mechanical allodynia in the inflamed hind limb, an effect blocked by naloxone.
    • Morphine did not alter the spontaneous firing rate of A-type nerve fibers.
    • Morphine markedly decreased the spontaneous firing rate of C-type nerve fibers in inflamed tissue.

    Conclusions:

    • Central plasticity, specifically related to A(beta) fibers, is crucial for morphine's alleviation of allodynia in inflammatory conditions.
    • Opioid receptor activation on peripheral C-fiber terminals may contribute to morphine's effectiveness in managing persistent inflammatory pain.