Related Experiment Videos
A decrease in brain catecholamines prevents oxiracetam antagonism of the effects of scopolamine on memory and brain
M G Giovannini1, G Spignoli, V Carlà
1Department of Preclinical and Clinical Pharmacology, University of Florence, Italy.
Pharmacological Research
|December 1, 1991
Summary
Oxiracetam did not improve memory or acetylcholine levels in rats with damaged monoamine pathways. Haloperidol blocked oxiracetam
Area of Science:
- Neuroscience
- Pharmacology
- Cognitive Science
Background:
- Investigated the role of monoaminergic pathways in cognitive function and the effects of nootropic drugs.
- Examined the interaction between neurotransmitter systems in the brain.
Purpose of the Study:
- To determine the effect of oxiracetam on passive avoidance conditioned response and acetylcholine levels in rats with selective lesions of central monoaminergic pathways.
- To explore the involvement of monoaminergic and cholinergic systems in the action of nootropic drugs.
Main Methods:
- Selective lesions of central monoaminergic pathways in rats.
- Administration of oxiracetam, scopolamine, and haloperidol.
- Assessment of passive avoidance conditioned response and brain acetylcholine levels.
Main Results:
- Lesions decreased cortical serotonin, noradrenaline, and striatal dopamine but did not affect passive avoidance or brain acetylcholine.
- Scopolamine induced amnesia and decreased acetylcholine levels in lesioned rats.
- Oxiracetam failed to prevent scopolamine-induced amnesia and acetylcholine decrease; this effect was blocked by haloperidol.
Conclusions:
- The findings suggest that the nootropic effects of oxiracetam may depend on the integrity of dopaminergic and noradrenergic pathways.
- An interaction between monoaminergic and cholinergic neurotransmitter systems is implicated in the cognitive effects of nootropic drugs.