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Updated: Dec 23, 2025
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A Protocol for Measuring Cue Reactivity in a Rat Model of Cocaine Use Disorder
Published on: June 18, 2018
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Midbrain D3 Receptor Availability Predicts Escalation in Cocaine Self-administration.
Stephanie M Groman1, Ansel T Hillmer2, Heather Liu3
1Department of Psychiatry, Yale University, New Haven, Connecticut.
Biological Psychiatry
|April 22, 2020
Summary
Poor decision-making, linked to dopamine D3 receptors in the midbrain, predicts higher susceptibility to cocaine addiction. This finding offers a potential biomarker for assessing addiction risk in humans.
Area of Science:
- Neuroscience
- Addiction Research
- Behavioral Pharmacology
Background:
- Substance dependence is linked to impaired decision-making, potentially due to drug-induced brain changes.
- Distinguishing between pre-existing vulnerabilities and addiction consequences is challenging in human studies.
- Animal models offer a translational approach to investigate neurobiological mechanisms of addiction susceptibility.
Purpose of the Study:
- To investigate the neurobiological underpinnings of decision-making deficits related to cocaine addiction susceptibility in a rat model.
- To identify potential biomarkers for predicting vulnerability to cocaine use and addiction.
Main Methods:
- Positron emission tomography (PET) was used to measure dopamine D2/3 and metabotropic glutamate receptor 5 (mGluR5) availability in rats.
- Decision-making was assessed using a probabilistic reversal learning task.
- Cocaine self-administration, motivation, and relapse behaviors were quantified.
Main Results:
- Deficits in reward-guided choice behavior correlated with increased cocaine self-administration and motivation.
- Higher midbrain dopamine D3 receptor availability was associated with these decision-making deficits and predicted escalated cocaine intake.
- No significant differences in mGluR5 availability or relapse behaviors were observed between groups.
Conclusions:
- A decision-making phenotype mediated by dopamine D3 receptors is identified as a potential biomarker for cocaine use susceptibility.
- This phenotype may help assess addiction risk in human populations.
- Midbrain dopamine D3 receptor availability independently predicts escalation of cocaine-taking behaviors.
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