Related Experiment Videos
Galanin microinjection in the third ventricle increases voluntary ethanol intake
Michael J Lewis1, Deanne F Johnson, Daniel Waldman
1Department of Psychology, Princeton University, Princeton, NJ 08544, USA. mlewis@princeton.edu
Alcoholism, Clinical and Experimental Research
|December 21, 2004
Summary
Galanin neuropeptide administration into the brain's third ventricle significantly increased voluntary ethanol consumption in rats. This effect was blocked by a galanin antagonist, suggesting galanin's role in alcohol intake.
Area of Science:
- Neuroscience
- Endocrinology
- Addiction Research
Background:
- Galanin, a neuropeptide, is known to stimulate food intake.
- Chronic ethanol (EtOH) exposure elevates hypothalamic galanin expression.
- This study investigates galanin's direct impact on voluntary alcohol consumption.
Purpose of the Study:
- To determine the effect of central galanin administration on ethanol intake.
- To assess galanin's role in modulating voluntary alcohol consumption patterns.
- To investigate the diurnal influence on galanin-induced ethanol consumption.
Main Methods:
- Male Sprague Dawley rats were cannulated in the third ventricle.
- Rats developed a preference for 7% ethanol over water.
- Microinjections of galanin (0, 1, 3 nmol) and galanin antagonist M40 were administered.
Main Results:
- Galanin administration dose-dependently increased ethanol intake during both light and dark cycles.
- Ethanol consumption increased significantly, while food and water intake remained unchanged.
- The galanin antagonist M40 blocked galanin-induced ethanol consumption, confirming receptor specificity.
Conclusions:
- Intraventricular galanin administration enhances voluntary ethanol consumption.
- Galanin's effect on ethanol intake is evident across diurnal cycles, even with food and water available.
- These findings suggest galanin may contribute to alcohol intake and the development of alcohol dependence.