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Prolonged ethanol intake increases D2 dopamine receptor expression in the rat brain
1Department of Anatomy, College of Medicine, Gyeongsang National University, Chinju, Korea.
Molecules and Cells
|December 5, 1997
Summary
Prolonged ethanol intake increases D2 dopamine receptor mRNA in key brain areas like the caudate putamen. This suggests a role for dopamine D2 receptor expression in alcoholism.
Area of Science:
- Neuroscience
- Molecular Biology
- Pharmacology
Background:
- Dopamine receptor interactions are crucial for mammalian brain functions, including behavior and endocrine regulation.
- Ethanol's behavioral effects are linked to its influence on the dopaminergic system.
Purpose of the Study:
- To investigate the impact of chronic ethanol consumption on D2 dopamine receptor mRNA expression in the rat brain.
- To determine specific brain regions affected by ethanol-induced changes in dopamine receptor mRNA levels.
Main Methods:
- In situ hybridization histochemistry to visualize receptor mRNA distribution.
- RNase protection assay to quantify changes in receptor mRNA levels.
- Utilized rat models for controlled ethanol intake and brain tissue analysis.
Main Results:
- D2 dopamine receptor mRNA was detected in various brain regions, including the caudate putamen, nucleus accumbens, and substantia nigra.
- Chronic ethanol intake (5 weeks) significantly increased D2 dopamine receptor mRNA expression in the caudate putamen and nucleus accumbens.
- RNase protection assay confirmed a ~1.5-fold increase in D2 dopamine receptor mRNA levels in the corpus striatum.
Conclusions:
- Ethanol consumption alters dopamine D2 receptor expression in specific brain areas.
- These findings support the involvement of dopamine D2 receptor regulation in the neurobiological underpinnings of alcoholism.