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Bidirectional changes in striatal D1-dopamine receptor density during chronic ethanol intake
1Laboratory of Neuroscience, Pennington Biomedical Research Center, Baton Rouge, LA 70808.
Life Sciences
|January 1, 1993
Summary
Chronic ethanol consumption alters D1 dopamine receptor density in the striatum, with effects varying based on exposure duration. Receptor affinity remains unchanged, suggesting density is the primary target of ethanol.
Area of Science:
- Neuroscience
- Pharmacology
Background:
- Previous research on ethanol's effects on D1 dopamine receptors yields conflicting results.
- Understanding these effects is crucial for addressing alcohol-related neurological disorders.
Purpose of the Study:
- To investigate the time-dependent effects of chronic ethanol intake on striatal D1 dopamine receptors.
- To clarify the relationship between ethanol exposure duration and receptor property alterations.
Main Methods:
- Dietary ethanol administration to rats for up to 10 weeks.
- Measurement of D1 dopamine receptor density (Bmax) and affinity (Kd) using [3H]SCH-23390 binding assays.
- Analysis of receptor properties 10 hours post-ethanol withdrawal.
Main Results:
- Ethanol intake induced bidirectional changes in D1 receptor Bmax during the first 4 weeks.
- Significant decreases and increases in Bmax were observed at different time points (1, 2, 3, and 4 weeks).
- After 6 and 10 weeks, Bmax returned to control levels, while Kd remained unaffected.
Conclusions:
- The duration of ethanol exposure is a critical factor influencing striatal D1 dopamine receptor density.
- Ethanol's impact on D1 receptors is dynamic and time-dependent, not a simple up or downregulation.
- These findings contribute to a more nuanced understanding of neuroadaptations in chronic alcohol consumption.