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Related Experiment Videos

Systemic or intrahippocampal cannabinoid administration impairs spatial memory in rats

A H Lichtman1, K R Dimen, B R Martin

  • 1Department of Pharmacology and Toxicology, Medical College of Virginia/Virginia Commonwealth University, Richmond 23298, USA.

Psychopharmacology
|June 1, 1995
PubMed
Summary

Cannabinoids like delta 9-THC impair working memory and cognitive performance in rats, with CP-55,940 being the most potent. Hippocampal cannabinoid receptors appear to mediate these memory deficits.

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Area of Science:

  • Neuroscience
  • Pharmacology

Background:

  • Cannabinoids are known to affect cognitive functions.
  • Working memory is crucial for complex tasks and can be sensitive to pharmacological agents.

Purpose of the Study:

  • To investigate the disruptive effects of cannabinoids on working memory using the eight-arm radial-maze.
  • To identify the neuroanatomical substrates responsible for cannabinoid-induced memory impairments.

Main Methods:

  • Systemic administration of delta 9-THC, WIN-55,212-2, and CP-55,940 in rats.
  • Assessment of working memory using an eight-arm radial-maze, measuring errors and completion time.
  • Intrahippocampal injections of CP-55,940 to determine the role of the hippocampus.

Main Results:

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  • Systemic CP-55,940, delta 9-THC, and WIN-55,212-2 impaired radial-maze performance, increasing errors and completion time.
  • CP-55,940 was the most potent cannabinoid, followed by delta 9-THC and WIN-55,212-2.
  • Intrahippocampal CP-55,940 impaired maze performance without affecting other cannabinoid-related behaviors, suggesting a specific cognitive role.

Conclusions:

  • Cannabinoids disrupt working memory, with varying potencies.
  • The hippocampus plays a significant role in mediating cannabinoid-induced working memory deficits.
  • Cannabinoid receptors in the hippocampus are likely involved in these cognitive impairments.