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Puromycin effect on memory may be due to occult seizures
Abstract:
Intracerebral injections of puromycin, which have been shown to impair memory 3 hours after training, increase the susceptibility of mice to seizures after administration of normally subconvulsive doses of pentylenetetrazol. Cycloheximide, which antagonizes the puromycin-induced amnesia 3 hours after training, also antagonizes the puromycin effect on susceptibility to seizure. The anticonvulsant diphenylhydantoin antagonizes the puromycin effect on memory. The puromycin effect on memory may be due to occult seizures.
Insights
Puromycin impairs memory and increases seizure susceptibility in mice. Drugs that block memory loss or seizures also block these puromycin effects, suggesting memory impairment may stem from seizures.
Area of Science:
- Neuroscience
- Pharmacology
- Memory Research
Background:
- Intracerebral puromycin injections are known to impair memory approximately 3 hours post-training.
- Puromycin administration can alter neurological function, potentially affecting seizure thresholds.
Purpose of the Study:
- To investigate the relationship between puromycin-induced memory impairment and seizure susceptibility.
- To determine if pharmacological interventions affecting memory or seizures can modulate these puromycin effects.
Main Methods:
- Mice received intracerebral puromycin injections.
- Seizure susceptibility was assessed after administration of pentylenetetrazol.
- The effects of cycloheximide and diphenylhydantoin on puromycin-induced memory and seizure changes were evaluated.
Main Results:
- Puromycin increased susceptibility to pentylenetetrazol-induced seizures.
- Cycloheximide counteracted both puromycin-induced amnesia and increased seizure susceptibility.
- Diphenylhydantoin, an anticonvulsant, antagonized the puromycin effect on memory.
Conclusions:
- Puromycin's effects on memory and seizure susceptibility are linked.
- The findings suggest that puromycin-induced memory impairment may result from subclinical (occult) seizures.
- Pharmacological agents targeting seizure activity or memory pathways can influence puromycin's neurological effects.