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The D3 dopamine receptor and substance dependence.
N M Richtand1, R J Goldsmith, J E Nolan
1Cincinnati Vetrans Affairs Medical Center, Psychiatry Service, OH 45220, USA. Neil.Richtand@uc.edu
Journal of Addictive Diseases
|October 30, 2001
Summary
Repeated stimulant use may cause drug dependence by reducing the function of the D3 dopamine receptor, which normally inhibits behavior. This desensitization may drive increased locomotion and drug craving.
Area of Science:
- Neuroscience
- Pharmacology
- Behavioral Science
Background:
- Behavioral sensitization, a key factor in drug dependence, involves progressive enhancement of stimulant-induced behaviors.
- Dopaminergic pathways are implicated in both sensitization and the development of drug craving and addiction.
Purpose of the Study:
- To propose and investigate the role of D3 dopamine receptor down-regulation in the development of behavioral sensitization.
- To elucidate the mechanisms by which dopamine receptor subtypes regulate locomotion during stimulant exposure.
Main Methods:
- The study proposes a model based on existing knowledge of dopamine receptor function and occupancy.
- The model integrates the opposing roles of D3 (inhibitory) and D1/D2 (stimulatory) dopamine receptors in rodent locomotion.
Main Results:
- D3 dopamine receptors have higher occupancy post-stimulant administration compared to D1 or D2 receptors.
- Sensitization may arise from reduced D3 receptor inhibition, leading to increased locomotion with repeated drug exposure.
Conclusions:
- Down-regulation of D3 dopamine receptor function is hypothesized to contribute to behavioral sensitization.
- Further research is required to validate this model and clarify the specific roles of dopamine receptor subtypes in sensitization and drug dependence.