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Intra-amygdala spermidine administration improves inhibitory avoidance performance in rats.
M A Rubin1, J A Stiegemeier, M A Volkweis
1Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil. marubin@quimica.ufsm.br
European Journal of Pharmacology
|July 5, 2001
Summary
Polyamines, like spermidine, enhance inhibitory avoidance learning in rats when infused into the amygdala. Arcaine, an NMDA receptor antagonist, reversed this effect, suggesting polyamine involvement in memory.
Area of Science:
- Neuroscience
- Molecular Biology
- Behavioral Science
Background:
- The amygdala plays a crucial role in learning and memory.
- Polyamines are involved in various cellular processes, including neurotransmission.
Purpose of the Study:
- To investigate the role of spermidine, a polyamine agonist, in inhibitory avoidance learning.
- To explore the involvement of NMDA receptor polyamine binding sites in this process.
Main Methods:
- Bilateral microinjection of spermidine and arcaine into the rat amygdala.
- Assessment of inhibitory avoidance learning using the step-down latency test.
Main Results:
- Spermidine administration increased step-down latencies at high concentrations.
- Arcaine administration decreased step-down latencies.
- Co-administration of arcaine and spermidine reversed the spermidine-induced effects.
Conclusions:
- Polyamines, specifically spermidine, modulate learning and memory in the amygdala.
- The NMDA receptor polyamine binding site is implicated in spermidine's effects on learning.