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Related Experiment Videos

Naltrexone-reversible pain suppression in the isolated attacking mouse.

B Siegfried1, H R Frischknecht

  • 1Institute of Pharmacology, University of Zurich, Switzerland.

Behavioral and Neural Biology
|November 1, 1988
PubMed
Summary

Aggressive encounters in mice activate natural pain relief systems, leading to higher pain thresholds. This opioid-mediated effect is linked to the stress of isolation and fighting.

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Area of Science:

  • Neuroscience
  • Behavioral Biology
  • Pain Research

Background:

  • Social isolation and aggressive encounters can profoundly impact an organism's physiology.
  • Understanding the neurobiological underpinnings of stress-related analgesia is crucial for behavioral science.

Purpose of the Study:

  • To investigate the impact of aggressive social interactions on pain perception in isolated mice.
  • To determine the role of endogenous opioid systems in mediating pain suppression during and after combat.

Main Methods:

  • DBA/2 mice were subjected to fighting encounters or isolation.
  • Tail-flick response latencies were measured to assess pain thresholds.
  • The effects of naltrexone, an opioid antagonist, were examined at different doses.

Main Results:

  • Fighting mice exhibited significantly increased tail-flick latencies, indicating elevated pain thresholds, regardless of combat outcome.
  • This analgesic effect was transient, lasting less than 10 minutes.
  • Naltrexone (0.2 mg/kg) blocked the pain threshold increase in attacking mice, while a higher dose (1.0 mg/kg) reduced attack behavior.

Conclusions:

  • Endogenous pain-suppressing systems, specifically opioid-mediated antinociception, are activated during aggressive encounters.
  • This opioid-mediated analgesia is associated with the isolation syndrome and reflects heightened arousal in attacking animals.

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