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Sequential involvement of NMDA receptor-dependent processes in hippocampus, amygdala, entorhinal cortex and parietal
M.S. Zanatta1, E. Schaeffer, P.K. Schmitz
1Centro de Memoria, Departamento de Bioquímica, Institute de Biociências, Universidade Federal do Rio Grande do Sul (U.F.R.G.S.) (centro), 90046-900 Porto Alegre, RS, Brazil.
Behavioural Pharmacology
|August 1, 1996
Summary
NMDA-receptor blockers administered post-training disrupt memory consolidation in rats. This disruption occurs sequentially in the hippocampus/amygdala, then entorhinal cortex, and finally parietal cortex, highlighting temporal NMDA-receptor involvement in memory processing.
Area of Science:
- Neuroscience
- Cognitive Science
- Memory Research
Background:
- Memory consolidation involves complex neural processes.
- NMDA receptors play a critical role in synaptic plasticity and memory formation.
- Understanding the temporal dynamics of NMDA receptor involvement is crucial for memory research.
Purpose of the Study:
- To investigate the temporal sequence of NMDA-receptor mediated memory processing in different brain regions after inhibitory avoidance training in rats.
- To determine the specific time windows and brain areas where NMDA receptor blockade affects memory retention.
Main Methods:
- Rats were trained on a step-down inhibitory avoidance task.
- Microinfusions of AP5 (an NMDA receptor antagonist) or saline were administered into the hippocampus, amygdala, entorhinal cortex, and parietal cortex at various post-training times.
- Memory retention was assessed 24 hours after training.
Main Results:
- AP5 administration immediately post-training impaired memory retention when infused into the hippocampus, amygdala, or both.
- Memory impairment was observed when AP5 was infused into the entorhinal cortex 30-90 minutes post-training.
- Infusion into the parietal cortex caused memory deficits 60-90 minutes post-training.
Conclusions:
- Memory consolidation involves a sequential activation of NMDA-receptor dependent mechanisms.
- Hippocampus and amygdala are involved early in post-training memory processing.
- Entorhinal and parietal cortices become involved sequentially at later time points.