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Parenteral domoic acid impairs spatial learning in mice
B F Petrie1, C Pinsky, N M Standish
1Department of Psychology, Red Deer College, Alberta, Canada.
Pharmacology, Biochemistry, and Behavior
|January 1, 1992
Summary
This study shows that a single injection of domoic acid impairs spatial learning and problem-solving strategies in mice. Domoic acid neurotoxicity affects the hippocampus and other brain regions involved in navigation.
Area of Science:
- Neuroscience
- Neurotoxicology
- Behavioral Neuroscience
Background:
- Domoic acid is a neurotoxin known to cause excitotoxicity.
- Its effects on complex cognitive functions like spatial learning are not fully understood.
- Previous research has implicated the hippocampus in spatial navigation tasks.
Purpose of the Study:
- To investigate the impact of a single intraperitoneal injection of domoic acid on learning and memory in mice.
- To assess the specific cognitive deficits induced by domoic acid exposure.
- To explore the potential brain regions affected by domoic acid in the context of spatial navigation.
Main Methods:
- A single intraperitoneal injection of domoic acid (2.0 mg/kg) or saline control was administered to mice.
- Spatial learning was assessed using the Morris water maze place task.
- Swim paths were analyzed to evaluate problem-solving strategies.
Main Results:
- Domoic acid-exposed mice exhibited significant impairment in acquiring the spatial task compared to controls.
- Mice treated with domoic acid failed to develop effective strategies for locating the underwater platform.
- Neuroanatomical evidence suggests damage extending beyond the hippocampus.
Conclusions:
- A single dose of domoic acid severely impairs spatial learning and navigation in mice.
- The observed deficits are associated with a failure to employ appropriate problem-solving strategies.
- Domoic acid-induced neuropathology affects multiple brain regions, including the hippocampus, limbic, and extralimbic areas.