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Alcohol preference: association with reduced striatal nicotinic receptors
Y Tizabi1, B Getachew, M Davila-Garcia
1Department of Pharmacology, College of Medicine, Howard University, 520 W Street NW, Washington, DC 20059, USA.
Alcohol and Alcoholism (Oxford, Oxfordshire)
|July 27, 2001
Summary
This study found that alcohol preference in rats is linked to fewer central nicotinic receptors in the striatum. These findings suggest nicotinic receptors in the striatum may play a role in alcohol consumption behaviors.
Area of Science:
- Neuroscience
- Pharmacology
- Genetics
Background:
- Nicotinic acetylcholine receptors (nAChRs) are implicated in various brain functions.
- Alcohol preference is a complex trait with potential neurobiological underpinnings.
- Specific nAChR subtypes may influence alcohol consumption.
Purpose of the Study:
- To investigate the association between inherent alcohol preference and the expression of central nicotinic receptors.
- To determine if alcohol-preferring (P) rats exhibit altered nicotinic receptor binding compared to non-preferring (NP) rats.
Main Methods:
- Used radioligands [(3)H]Cytisine and [(125)I]alpha-bungarotoxin to quantify binding sites for alpha4beta2 and alpha7 nAChR subtypes, respectively.
- Measured receptor binding in various brain regions of P and NP rats.
- Compared binding site densities between the two rat groups.
Main Results:
- A significant reduction in binding sites for both alpha4beta2 and alpha7 nAChRs was observed in the striatum of P rats compared to NP rats.
- No significant differences in receptor binding were found in other brain regions examined.
Conclusions:
- The striatum exhibits differential expression of key nicotinic acetylcholine receptor subtypes related to alcohol preference.
- These findings suggest a potential role for striatal nicotinic receptors in the mechanisms underlying alcohol preference and consumption.