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Smoking-induced ventral striatum dopamine release
Arthur L Brody1, Richard E Olmstead, Edythe D London
1Veterans Affairs Greater Los Angeles Healthcare, 300 UCLA Medical Plaza, Suite 2200, Los Angeles, CA 90095, USA. abrody@ucla.edu
The American Journal of Psychiatry
|July 2, 2004
Summary
Smoking a cigarette significantly reduces dopamine release in the ventral striatum of nicotine-dependent individuals. This finding, measured using positron emission tomography (PET), links dopamine pathways to nicotine addiction.
Area of Science:
- Neuroscience
- Addiction Research
- Pharmacology
Background:
- Animal models suggest dopamine release in the ventral striatum is key to nicotine's reinforcing effects.
- Understanding this mechanism in humans is crucial for addiction treatment.
Purpose of the Study:
- To quantify smoking-induced dopamine release in the human ventral striatum.
- To investigate the relationship between dopamine release, smoking, and craving.
Main Methods:
- Utilized [(11)C]raclopride bolus-plus-continuous-infusion positron emission tomography (PET).
- Recruited 20 nicotine-dependent smokers, divided into smoking and non-smoking groups during a PET scan break.
Main Results:
- Smokers showed significantly greater reductions in [(11)C]raclopride binding potential in ventral striatum regions (e.g., nucleus accumbens, ventral putamen) compared to non-smokers.
- Reductions in binding potential correlated with self-reported craving levels.
Conclusions:
- Smoking acutely reduces dopamine release in the human ventral striatum, confirming animal model findings.
- The observed dopamine changes are comparable to those seen with other addictive substances, highlighting a common neurobiological pathway in addiction.