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Basal forebrain lesioned mice exhibit deterioration in memory acquisition process in step through passive avoidance

A Ishihara1, H Saito, H Ohta

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

Japanese Journal of Pharmacology
|November 1, 1991
PubMed
Summary

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Bilateral basal forebrain (BF) lesions in mice severely impaired learning acquisition but not retention. This study demonstrates a reliable method for creating memory-impaired mouse models for research.

Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Memory Research

Background:

  • The basal forebrain (BF) plays a critical role in cognitive functions, including learning and memory.
  • Understanding the specific contributions of BF subregions to memory processes is essential for developing effective treatments for memory disorders.

Purpose of the Study:

  • To investigate the effects of bilateral basal forebrain (BF) lesions on memory and learning performances in mice.
  • To establish a reliable animal model for studying memory impairment.

Main Methods:

  • Eight-week-old male mice underwent bilateral BF lesions using radiofrequency current.
  • Learning and memory were assessed using the step-through type passive avoidance task over 10 days, starting 15 days post-surgery.
  • Motor activity was monitored to rule out confounding effects.

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Main Results:

  • BF-lesioned mice exhibited significant impairment in the acquisition phase of the passive avoidance task.
  • No significant differences were observed in the retention phase of the task between lesioned and control groups.
  • Ambulatory activity remained unchanged, indicating that motor function was not affected by the lesion.

Conclusions:

  • Bilateral BF lesions in mice lead to specific deficits in learning acquisition without affecting memory retention.
  • Radiofrequency-induced bilateral BF lesions provide a viable method for creating a memory-impaired mouse model for further research.