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Related Experiment Videos

Exploring the opioid system by gene knockout.

Brigitte L Kieffer1, Claire Gavériaux-Ruff

  • 1IGBMC UMR 7104, Parc d'innovation 1, rue Laurent Fries, B.P.163, 67404 Illkirch Cedex, France. briki@igbmc.u-strasbg.fr

Progress in Neurobiology
|May 17, 2002
PubMed
Summary

Mice lacking specific opioid genes reveal distinct roles in behavior and pain. Mu-opioid receptor (MOR) is key for morphine effects, while delta-opioid receptor (DOR) and kappa-opioid receptor (KOR) are targets for pain relief.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Genetics

Background:

  • The endogenous opioid system comprises three peptide precursor genes (Penk, Pdyn, POMC) and three receptor genes (MOR, DOR, KOR).
  • Understanding the precise roles of these genes is crucial for developing targeted pain and addiction therapies.

Purpose of the Study:

  • To elucidate the distinct physiological and behavioral functions of each endogenous opioid system gene.
  • To clarify the roles of opioid receptors in analgesia, addiction, and responses to exogenous opiates.
  • To explore potential therapeutic targets within the opioid system.

Main Methods:

  • Homologous recombination was used to inactivate all six endogenous opioid system genes in mice, creating various knockout models.
  • Behavioral analyses were conducted on mutant mice to assess locomotion, pain perception, emotional behaviors, and responses to opiates and other drugs of abuse.

Related Experiment Videos

  • A triple opioid receptor knockout mutant was utilized to investigate non-classical opioid pharmacology.

    • Main Results:

    • Inactivation of individual opioid genes revealed distinct roles in modulating locomotion, pain, and emotional behaviors.
    • Mu-opioid receptor (MOR) knockout mice confirmed its essential role in morphine analgesia and addiction.
    • Delta-opioid receptor (DOR) and kappa-opioid receptor (KOR) deficient mice demonstrated their potential as targets for pain treatment, with DOR showing unexpected roles.
    • Evidence suggests that DOR agonists partially require MOR for their activity, supporting in vivo mu-delta interactions.
    • Opioid system genes play a role in responses to other drugs of abuse.

    Conclusions:

    • Studies using null mutant mice have significantly advanced the understanding of opioid system molecular players in pharmacology and physiology.
    • MOR is critical for morphine's effects, while DOR and KOR represent promising targets for novel pain therapeutics.
    • Future research should integrate peptide and receptor knockout analyses with advanced gene targeting for a comprehensive understanding.