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Updated: Jul 13, 2026
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Comprehensive Analysis of Transcription Dynamics from Brain Samples Following Behavioral Experience
Published on: August 26, 2014
Cocaine experience controls bidirectional synaptic plasticity in the nucleus accumbens
Saïd Kourrich1, Patrick E Rothwell, Jason R Klug
1Department of Neuroscience, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Summary
Repeated cocaine exposure causes lasting changes in nucleus accumbens (NAc) synaptic strength. Re-exposure during withdrawal reverses these changes, potentially impacting addiction.
Area of Science:
- Neuroscience
- Addiction Research
- Synaptic Plasticity
Background:
- Glutamatergic synapse plasticity in the nucleus accumbens (NAc) is crucial for how experience influences behavior, particularly in addiction.
- Understanding how drug use alters synaptic plasticity in the NAc is vital for addiction research.
Purpose of the Study:
- To investigate the effects of repeated cocaine exposure on glutamatergic synaptic plasticity in the NAc.
- To determine how synaptic plasticity in the NAc changes during withdrawal and re-exposure to cocaine.
Main Methods:
- Whole-cell synaptic physiology was used in NAc brain slices from mice.
- Repeated in vivo cocaine exposure was administered, followed by drug-free periods and single re-exposure during extended withdrawal.
Main Results:
- Repeated cocaine exposure induced bidirectional changes in glutamatergic synaptic strength in the NAc.
- During protracted withdrawal, NAc neurons showed potentiation of AMPA receptor (AMPAR)-mediated transmission.
- Single cocaine re-exposure during extended withdrawal triggered synaptic depression, reversing the potentiation.
Conclusions:
- Enduring modifications in AMPAR-mediated responses and plasticity in the NAc may underlie altered processing of drug cues in individuals with addiction.
- These findings highlight the dynamic nature of synaptic plasticity in the NAc in response to drug experience and withdrawal.
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