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Related Experiment Videos

State dependent and/or direct memory retrieval by morphine in mice.

M Nishimura1, Y Shiigi, H Kaneto

  • 1Department of Pharmacology, Faculty of Pharmaceutical Sciences, Nagasaki University, Japan.

Psychopharmacology
|January 1, 1990
PubMed
Summary

Pre-test morphine administration reversed memory impairment in mice, suggesting both direct and state-dependent effects. This finding offers insights into potential therapeutic strategies for memory deficits.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Behavioral Science

Background:

  • Passive avoidance learning is a crucial model for studying memory formation and retrieval.
  • Opioid administration, such as morphine, is known to affect cognitive functions, including memory.

Purpose of the Study:

  • To investigate the effects of pre-test morphine administration on memory retention in mice.
  • To determine if morphine can reverse amnesia induced by other agents or conditions.

Main Methods:

  • Mice were trained in step-down and step-through passive avoidance tasks.
  • Morphine or saline was administered before training and/or retention tests.
  • Amnesia was induced using scopolamine, cycloheximide, or electroconvulsive shock (ECS).

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Main Results:

  • Pre-training morphine impaired memory retention.
  • Administering morphine 30 minutes before the retention test fully reversed morphine-induced memory impairment.
  • Pre-test morphine also reversed amnesia caused by scopolamine, cycloheximide, and ECS.
  • Saline administration before the retention test partially reversed morphine-induced impairment, suggesting a state-dependent effect.

Conclusions:

  • Pre-test morphine administration directly reverses memory impairment in mice.
  • The memory recovery effect of morphine is partially mediated by state-dependent learning.
  • These findings highlight morphine's complex role in memory modulation and potential therapeutic applications.