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Short toxic methamphetamine schedule impairs object recognition task in male rats
Veronica Bisagno1, Deveroux Ferguson, Victoria N Luine
1Department of Psychology, Hunter College of the City University of New York, 695 Park Ave, New York, NY 10021, USA. vbisagno@hunter.cuny.edu
Brain Research
|May 22, 2002
Summary
Short-term methamphetamine exposure significantly impacts rat neurochemistry and behavior. While object recognition memory declined, spatial memory in the object placement task remained largely intact despite reduced exploratory drive.
Area of Science:
- Neuroscience
- Behavioral Pharmacology
- Toxicology
Background:
- Methamphetamine (MA) is a potent psychostimulant with known neurotoxic effects.
- Understanding the behavioral and neurochemical consequences of varying MA dosing regimens is crucial.
- Previous studies often utilize more intensive dosing protocols to induce toxicity.
Purpose of the Study:
- To investigate the neurochemical and behavioral effects of a short-dosing methamphetamine (MA) regimen.
- To assess performance on object recognition and object placement memory tasks following MA exposure.
- To correlate neurochemical changes with observed behavioral deficits.
Main Methods:
- Adult male rats received three injections of 10 mg/kg methamphetamine at 2-hour intervals.
- Neurotransmitter levels (dopamine, serotonin) were measured in specific brain regions post-testing.
- Behavioral testing included open field activity, object recognition, and object placement tasks with varying inter-trial delays.
Main Results:
- Striatal dopamine and serotonin were significantly depleted (65% and 79%, respectively).
- No significant neurochemical changes were observed in the pre-frontal cortex, hippocampus, VTA, or substantia nigra.
- MA-treated rats exhibited reduced exploratory activity and impaired performance on the object recognition task, but not the object placement task at 2-h and 4-h delays.
Conclusions:
- A short, intensive methamphetamine dosing schedule induces significant neurochemical alterations, particularly in the striatum.
- This regimen selectively impairs object recognition memory and general exploratory behavior.
- Spatial memory, as assessed by the object placement task, appears more resilient to this short-term MA exposure.
