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Ethanol induces higher BEC in CB1 cannabinoid receptor knockout mice while decreasing ethanol preference
1Biologie du Comportement, Université Catholique de Louvain, 1 Place Croix du Sud, 1348 Louvain-la-Neuve, Belgium.
Alcohol and Alcoholism (Oxford, Oxfordshire)
|November 20, 2004
Summary
CB(1) knockout mice exhibit altered blood ethanol concentration and reduced ethanol preference, suggesting CB(1) receptors influence alcohol metabolism and consumption behaviors. These findings highlight the role of CB(1) receptors in alcohol
Area of Science:
- Neuroscience
- Pharmacology
- Genetics
Background:
- Cannabinoid receptor 1 (CB(1)) antagonists like SR 141716 affect ethanol-induced behaviors in rats.
- CB(1) receptors are implicated in the complex relationship between alcohol and behavior.
Purpose of the Study:
- To investigate the impact of acute and chronic alcohol exposure on blood ethanol concentration (BEC) and ethanol preference in CB(1) knockout mice.
- To extend previous findings on CB(1) receptor involvement in ethanol's behavioral effects.
Main Methods:
- CB(1) knockout (-/-) and wild-type (+/+) male mice were administered acute ethanol (1, 3, or 5 g/kg).
- Blood ethanol concentration (BEC) was monitored for 8 hours post-injection.
- Ethanol preference was assessed through non-forced and forced chronic pulmonary alcohol administration over 14 and 39 days.
Main Results:
- CB(1) knockout mice showed significantly higher BEC during ethanol elimination after a 5 g/kg dose compared to wild-type mice.
- A 2-3 fold increase in BEC was observed in CB(1) knockout mice during chronic alcoholization (days 10-11).
- CB(1) knockout mice displayed significantly lower ethanol preference than wild-type mice.
Conclusions:
- CB(1) receptor plays a confirmed role in ethanol-induced behavioral effects.
- CB(1) receptors appear to influence ethanol absorption and distribution, particularly at high doses.
- Genetic deletion of CB(1) receptors alters alcohol metabolism and preference.