Related Experiment Video

Updated: May 6, 2026

Assessment of Morphine-induced Hyperalgesia and Analgesic Tolerance in Mice Using Thermal and Mechanical Nociceptive Modalities
07:23

Assessment of Morphine-induced Hyperalgesia and Analgesic Tolerance in Mice Using Thermal and Mechanical Nociceptive Modalities

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Opioid tolerance-in search of the holy grail

Brigitte L Kieffer1, Christopher J Evans

  • 1Institut de Génétique et de Biologie Moléculaire et Cellulaire, 67400 Illkirch, France. briki@igbmc.u-strasbg.fr

Cell
|March 15, 2002
PubMed

Insights

Opioid tolerance, a common adaptation to pain medication, may be reduced by receptor internalization, challenging the traditional view of receptor desensitization. This finding offers new insights into managing pain treatment.

Area of Science:

  • Pharmacology
  • Neuroscience
  • Cell Biology

Background:

  • Opioid tolerance is a significant challenge in managing chronic pain.
  • Traditionally, opioid tolerance is attributed to opioid receptor desensitization and reduced cell surface receptor expression.
  • Recent research suggests alternative mechanisms may be involved.

Purpose of the Study:

  • To investigate the role of opioid receptor internalization in the development of opioid tolerance.
  • To challenge the established understanding of opioid tolerance mechanisms.

Main Methods:

  • The study likely involved in vivo experiments to observe receptor behavior.
  • Methods may include techniques to measure receptor signaling and cell surface expression.
  • Analysis of behavioral adaptations to prolonged opioid treatment.

Main Results:

  • Evidence suggests that receptor internalization may decrease opioid tolerance.
  • This contrasts with the conventional explanation of receptor desensitization.

Conclusions:

  • Opioid receptor internalization could be a protective mechanism against tolerance development.
  • This finding necessitates a re-evaluation of the mechanisms underlying opioid tolerance.

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