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Intraseptal flumazenil enhances, while diazepam binding inhibitor impairs, performance in a working memory task
C D Herzog1, R W Stackman, T J Walsh
1Department of Psychology, Rutgers University, New Brunswick, New Jersey 08903, USA.
Neurobiology of Learning and Memory
|November 1, 1996
Summary
Intraseptal flumazenil enhances spatial working memory in rats by modulating GABAA/benzodiazepine receptors. This effect was observed after an 8-hour delay and did not impact anxiety or locomotion.
Area of Science:
- Neuroscience
- Behavioral Pharmacology
Background:
- GABAA/benzodiazepine receptors in the medial septum regulate hippocampal cholinergic activity.
- Benzodiazepine agonists impair working memory and reduce hippocampal choline transport, while antagonists show opposite effects.
Purpose of the Study:
- To investigate the behavioral effects of medial septal flumazenil and diazepam binding inhibitor (DBI) on spatial working memory, anxiety, and locomotion.
- To characterize flumazenil's role as a potential enhancer of cognitive function.
Main Methods:
- Intraseptal injections of flumazenil and DBI were administered to male Sprague-Dawley rats.
- Spatial working memory was assessed using the delayed non-match to sample (DNMTS) radial maze task.
- Anxiety-related behaviors and locomotor activity were measured using the elevated plus maze and open field tests, respectively.
Main Results:
- Intraseptal flumazenil (10 nmol) significantly enhanced DNMTS performance after an 8-hour delay, but not a 4-hour delay.
- Flumazenil did not affect locomotor activity or anxiety measures.
- Intraseptal DBI (8 nmol) had no effect, while a lower dose (4 nmol) slightly impaired DNMTS performance after an 8-hour delay, without altering locomotion or anxiety.
Conclusions:
- Intraseptal flumazenil exhibits a unique pro-mnemonic effect on working memory.
- The findings suggest a specific role for medial septal GABAA/benzodiazepine receptor modulation in enhancing cognitive performance.