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Memory effects of the combination of medazepam with nootropic agents
S Rousseva1, V V Petkov, V D Petkov
1Institute of Physiology, Bulgarian Academy of Sciences.
Abstract:
Experiments were made on rats using step-through passive avoidance method to study the effect of the benzodiazepine medazepam (Mz) on the retention of the memory traces during tests on the 3rd hour, 24th hour and 7th day after training, as well as the influencing of this effect by the nootropic agents meclofenoxate (Mf), aniracetam (Anc) and Euclidan (Eucl.). All substances tested (Mz in a dose of 5 mg/kg weight, Mf - 100 mg/kg, Anc and Eucl - 50 mg/kg), applied both independently and in combination, were administered orally for six days prior to the training. Mz was found to impair the retention of the memory traces in all three tests. Meclofenoxate totally eliminated the memory-impairing effect of Mz. A marked antiamnestic effect of both Anc and Eucl was observed in similar experiments with scopolamine-induced (2 mg/kg i.p.) amnesia. Bearing in mind the results of other behavioural and biochemical studies, including radioligand tests, an attempt is made to justify the idea that the basic mechanism of the amnestic action of Mz is connected with the cerebral cholinergic neurotransmission. The results of the experiments using Opto-Varimex and Automex equipment for testing the effects of Mz, Mf, Anc and Eucl, and of the combination of Mz with the nootropic agents studied, on the spontaneous motor activity of the experimental rats, lead to the most general conclusion that Mz impedes the development of habituation, considered as a specific type of learning and memory process. To one degree or another, Mf, Anc and Eucl cancel this effect of Mz.(ABSTRACT TRUNCATED AT 250 WORDS)
Insights
Medazepam (Mz) impairs memory retention in rats, but nootropic agents meclofenoxate (Mf), aniracetam (Anc), and Euclidan (Eucl) counteract this effect. These nootropics also show antiamnestic properties against scopolamine-induced amnesia.
Area of Science:
- Neuroscience
- Pharmacology
- Behavioral Science
Background:
- Benzodiazepines, like medazepam (Mz), can affect cognitive functions, including memory.
- Nootropic agents are explored for their potential to enhance or protect cognitive processes.
- Understanding drug-induced amnesia mechanisms is crucial for developing therapeutic interventions.
Purpose of the Study:
- To investigate the effects of medazepam (Mz) on memory retention in rats.
- To evaluate the potential of meclofenoxate (Mf), aniracetam (Anc), and Euclidan (Eucl) to counteract Mz-induced memory impairment.
- To explore the antiamnestic effects of Mf, Anc, and Eucl against scopolamine-induced amnesia.
Main Methods:
- Step-through passive avoidance test in rats to assess memory retention.
- Administration of medazepam (Mz), meclofenoxate (Mf), aniracetam (Anc), and Euclidan (Eucl) orally for six days prior to training.
- Testing memory retention at 3 hours, 24 hours, and 7 days post-training.
- Assessment of spontaneous motor activity using Opto-Varimex and Automex equipment.
Main Results:
- Medazepam (Mz) significantly impaired memory retention across all tested time points.
- Meclofenoxate (Mf) completely reversed the memory-impairing effects of Mz.
- Aniracetam (Anc) and Euclidan (Eucl) demonstrated significant antiamnestic effects against scopolamine-induced amnesia.
- Mz was found to impede habituation, a learning and memory process, an effect mitigated by Mf, Anc, and Eucl.
Conclusions:
- Medazepam impairs memory retention, potentially through mechanisms involving cerebral cholinergic neurotransmission.
- Nootropic agents meclofenoxate, aniracetam, and Euclidan can effectively counteract medazepam-induced amnesia.
- These nootropics exhibit protective effects against other forms of induced amnesia and may enhance learning processes.