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Impaired Synaptic Activity in the Basolateral Amygdala Is Associated With an Alcohol Use Disorder-Like Vulnerable
Davide Cadeddu1, Erika Lucente1, Mia Ericson2
1Department of Pharmacology, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
Addiction Biology
|October 14, 2025
Summary
Vulnerable rats showed reduced basolateral amygdala (BLA) neuron activity, indicating a hypoglutamatergic state linked to alcohol use disorder (AUD) progression. This hypoexcitability may underlie alcohol addiction persistence.
Area of Science:
- Neuroscience
- Neurobiology
- Addiction Research
Background:
- Alcohol use disorder (AUD) involves loss of control, potentially due to brain changes, particularly in the basolateral amygdala (BLA).
- The BLA is crucial for emotional regulation and learning, influencing alcohol-related behaviors and AUD vulnerability.
Purpose of the Study:
- To investigate the role of BLA neurotransmission in AUD vulnerability using a rodent model.
- To correlate neurophysiological BLA parameters with AUD-like progression after chronic alcohol exposure.
Main Methods:
- Utilized a multisymptomatic rodent model for AUD.
- Performed electrophysiological whole-cell recordings and field potential recordings in the BLA.
- Assessed rats after 4 months of voluntary alcohol consumption.
Main Results:
- Rats were categorized as resilient or vulnerable to AUD-like behavior.
- Vulnerable rats exhibited reduced frequency and amplitude of spontaneous excitatory post-synaptic currents (sEPSCs), suggesting suppressed glutamatergic input.
- BLA neurons showed decreased intrinsic excitability in vulnerable rats, correlating with addiction scores.
Conclusions:
- Hypoexcitability of BLA neurons may be a neurobiological factor in developing and maintaining alcohol addiction.
- Findings highlight the BLA's role in the persistence of alcohol addiction-like behaviors.
