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Cortical dopaminergic involvement in cocaine reinforcement
Science (New York, N.Y.)
|August 19, 1983
Summary
Cocaine reinforcement is initiated in the medial prefrontal cortex, not the nucleus accumbens or ventral tegmental area. This action involves dopaminergic receptors, suggesting a direct role in addiction.
Area of Science:
- Neuroscience
- Pharmacology
- Addiction Research
Background:
- Cocaine addiction is a significant public health issue.
- Understanding the neural circuits underlying cocaine reinforcement is crucial for developing effective treatments.
- Previous research has implicated various brain regions in drug seeking behavior.
Purpose of the Study:
- To identify specific brain regions where direct cocaine application is reinforcing.
- To investigate the role of dopaminergic receptors in cocaine reinforcement.
- To elucidate the neuronal systems involved in the initiation of cocaine reinforcement.
Main Methods:
- Rats were trained to self-administer picomolar concentrations of cocaine directly into discrete brain regions.
- The medial prefrontal cortex, nucleus accumbens, and ventral tegmental area were targeted for microinjections.
- The effect of the dopaminergic D2-receptor antagonist sulpiride on cocaine self-administration was assessed.
Main Results:
- Rats successfully self-administered cocaine in the medial prefrontal cortex.
- Cocaine self-administration was not supported in the nucleus accumbens or ventral tegmental area.
- The inclusion of sulpiride attenuated cocaine self-administration, indicating a role for dopaminergic D2 receptors.
Conclusions:
- The medial prefrontal cortex plays a critical role in the initiation of cocaine reinforcement.
- Cocaine reinforcement is mediated, in part, by a direct action on mesocortical dopaminergic receptors.
- Targeting these dopaminergic pathways may offer a therapeutic strategy for cocaine addiction.