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Related Experiment Videos

Antagonism of endogenous opioids modulates memory processing.

J F Flood1, A Cherkin, J E Morley

  • 1Geriatric Research, Education and Clinical Center, Veterans Administration Hospital, Sepulveda, CA 91343.

Brain Research
|October 6, 1987
PubMed
Summary
This summary is machine-generated.

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Opioid antagonists like naloxone enhance memory retention and recall in mammals and birds. This memory enhancement is mediated by the mu-opioid receptor and exhibits an inverted U-shaped dose-response curve.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Behavioral Science

Background:

  • Opioid systems play a role in learning and memory.
  • Opioid antagonists are known to interact with these systems.

Purpose of the Study:

  • To investigate the effects of opioid antagonism on memory retention and recall.
  • To determine the receptor specificity and dose-response characteristics of opioid antagonists in memory enhancement.

Main Methods:

  • Administration of opioid antagonists (naloxone, nalmefene, beta-funaltrexamine) to mice and chicks post-training and pre-test.
  • Behavioral testing for memory retention and acquisition.
  • Stereospecificity and dose-response analyses.
  • Assessment of anti-amnestic properties against anisomycin and scopolamine.

Related Experiment Videos

  • Selective mu-opioid receptor blockade using beta-funaltrexamine.

    • Main Results:

    • Opioid antagonism, particularly with naloxone and nalmefene, significantly improved memory retention and recall in mice and chicks.
    • The memory-enhancing effect was stereospecific and dose-dependent, following an inverted U-shaped curve.
    • Naloxone exhibited anti-amnestic properties against protein synthesis inhibitors and acetylcholine receptor blockers.
    • Selective blockade of mu-opioid receptors with beta-funaltrexamine prevented naloxone-induced memory enhancement, indicating mu-receptor mediation.

    Conclusions:

    • Opioid antagonism enhances memory across different animal classes (Aves and Mammalia).
    • The memory-enhancing effects of opioid antagonists are primarily mediated by the mu-opioid receptor.
    • These findings suggest potential therapeutic applications for opioid antagonists in memory disorders.