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A neural substrate of compulsive alcohol use
Esi Domi1, Li Xu2,3, Sanne Toivainen2
1Center for Social and Affective Neuroscience, BKV, Linköping University, Linköping 581 85, Sweden. esi.domi@liu.se.
Science Advances
|August 19, 2021
Summary
Researchers identified compulsive alcohol drinking in rats, a key feature of alcohol addiction. This behavior was linked to specific brain activity in the central nucleus of the amygdala (CeA), offering a potential therapeutic target.
Area of Science:
- Neuroscience
- Addiction Research
- Behavioral Pharmacology
Background:
- Alcohol addiction is characterized by compulsive alcohol seeking and intake, persisting despite negative consequences.
- Identifying the neural mechanisms underlying this compulsive behavior is crucial for developing effective treatments.
Purpose of the Study:
- To identify neural correlates of compulsive alcohol-taking behavior in a rat model.
- To investigate the role of the central nucleus of the amygdala (CeA) in punishment-resistant alcohol self-administration.
Main Methods:
- Utilized a footshock-punished alcohol self-administration paradigm in outbred rats.
- Employed unsupervised clustering to identify behavioral phenotypes.
- Used activity-dependent tagging and chemogenetics to manipulate neuronal activity in the CeA.
Main Results:
- A subpopulation of rats exhibited stable, punishment-resistant alcohol self-administration, indicative of compulsive behavior.
- Activity within a brain network including the CeA was associated with this compulsivity.
- Protein kinase C delta (PKCδ)+ inhibitory neurons in the lateral CeA (CeL) significantly predicted compulsive alcohol intake.
- Inhibiting CeA neurons or reducing PKCδ expression suppressed compulsive alcohol taking.
Conclusions:
- Compulsive alcohol-taking is a stable trait linked to specific neural circuitry in the CeA.
- PKCδ-expressing inhibitory neurons in the CeL play a critical role in the manifestation of alcohol addiction.
- This study identifies a novel mechanism and potential therapeutic target for alcohol addiction.
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