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A General Method for Evaluating Deep Brain Stimulation Effects on Intravenous Methamphetamine Self-Administration
Published on: January 22, 2016
Long-term changes in dopamine-stimulated gene expression after single-day methamphetamine exposure
Annabelle M Belcher1, Steven J O'Dell, John F Marshall
1Department of Neurobiology and Behavior, University of California, Irvine, California 92697, USA.
Synapse (New York, N.Y.)
|January 30, 2009
Summary
Methamphetamine (mAMPH) damages brain cells, causing lasting behavioral issues. This study shows mAMPH impairs dopamine-stimulated brain activity long after drug use, affecting multiple brain regions.
Area of Science:
- Neuroscience
- Pharmacology
- Neurotoxicology
Background:
- Methamphetamine (mAMPH) is a psychostimulant causing addiction and monoaminergic neuron injury.
- Human studies show mAMPH abuse alters cortical function; animal models focus on monoaminergic projections.
Purpose of the Study:
- To investigate long-term cortical and subcortical function after a single neurotoxic mAMPH regimen in rats.
- To assess if behavioral impairments correlate with enduring drug effects on brain function.
Main Methods:
- Rats received a single neurotoxic mAMPH dose or saline.
- Five weeks later, rats were challenged with apomorphine (dopamine agonist) or pilocarpine (muscarinic agonist).
- Immediate early gene (IEG) responses (Fos, JunB) in brain tissue were measured via immunocytochemistry.
Main Results:
- mAMPH-pretreated rats showed 50-70% fewer Fos/JunB-positive cells in multiple cortical and subcortical areas after apomorphine.
- No significant reduction in Fos/JunB-positive cells was observed in mAMPH-pretreated rats after pilocarpine challenge.
- This indicates a selective impairment in dopamine-stimulated gene expression.
Conclusions:
- Single-day neurotoxic methamphetamine exposure causes profound and enduring deficits in dopamine-stimulated cortical function in rats.
- These findings highlight the lasting impact of methamphetamine on dopaminergic pathways and associated brain regions.
