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Repeated stress causes reversible impairments of spatial memory performance
V Luine1, M Villegas, C Martinez
1Department of Psychology, Hunter College, New York, NY 10021.
Brain Research
|March 7, 1994
Summary
Chronic stress impairs spatial memory in the eight-arm radial maze. This memory deficit and associated hippocampal neuron atrophy are reversible and can be blocked by phenytoin or tianeptine.
Area of Science:
- Neuroscience
- Behavioral Science
- Pharmacology
Background:
- Restraint stress is a known factor affecting cognitive functions.
- The hippocampus, particularly CA3 neurons, plays a crucial role in spatial memory formation.
- Stress-induced neuronal changes may underlie cognitive impairments.
Purpose of the Study:
- To investigate the impact of chronic restraint stress on spatial memory acquisition.
- To explore the reversibility of stress-induced memory deficits.
- To determine the effects of phenytoin and tianeptine on stress-related behavioral and neuronal changes.
Main Methods:
- Rats were subjected to daily restraint stress for 21 days.
- Spatial memory performance was assessed using the eight-arm radial maze.
- Drug treatments (phenytoin or tianeptine) were administered.
- Hippocampal CA3 neuronal morphology was examined.
Main Results:
- Chronic stress significantly impaired spatial memory acquisition.
- The behavioral impairment was reversible and temporally limited.
- Phenytoin and tianeptine blocked the stress-induced memory impairment.
- These drugs also prevented stress-induced atrophy of hippocampal CA3 neuron dendrites.
Conclusions:
- Chronic stress causes reversible spatial memory deficits and hippocampal CA3 dendritic atrophy.
- Phenytoin and tianeptine can mitigate these stress-induced effects.
- Excitatory amino acid and serotonin pathways may be involved in stress-related cognitive dysfunction.