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Drug addiction, relapse, and the amygdala
Ronald E See1, Rita A Fuchs, Christopher C Ledford
1Department of Physiology and Neuroscience, Medical University of South Carolina, Charleston, South Carolina 29425, USA. seere@musc.edu
Annals of the New York Academy of Sciences
|May 2, 2003
Summary
The basolateral amygdala (BLA) is crucial for drug relapse. It mediates learned associations with drug cues, impacting drug-seeking behavior and relapse after cocaine or heroin use.
Area of Science:
- Neuroscience
- Addiction Research
- Behavioral Science
Background:
- The amygdala is implicated in learning associations with rewards.
- Understanding the amygdala's role in drug addiction and relapse is a growing area of interest.
Purpose of the Study:
- To investigate the role of the basolateral amygdala (BLA) in conditioned-cued relapse to drug-seeking behavior.
- To determine if the BLA is essential for acquiring associations with drug-paired stimuli.
Main Methods:
- Utilized an animal model of relapse following chronic cocaine self-administration.
- Employing permanent lesions and reversible pharmacologic inactivation of the BLA.
- Administering dopamine D1 receptor antagonists and amphetamine into the BLA.
- Disrupting BLA neural activity during the acquisition phase of stimulus-cocaine associations.
Main Results:
- Lesions or inactivation of the BLA attenuated conditioned-cued reinstatement of drug-seeking behavior.
- BLA manipulation did not affect self-administration or cue-independent relapse.
- Dopamine D1 receptor blockade in the BLA inhibited reinstatement, while amphetamine potentiated it.
- Disrupting BLA activity during acquisition prevented conditioned stimuli from eliciting relapse.
Conclusions:
- The basolateral amygdala (BLA) is critical for the acquisition and expression of drug-associated learning.
- The BLA is a key component of corticolimbic circuits involved in drug relapse.
- Targeting the BLA may offer therapeutic strategies for addiction treatment.