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A Method for Evaluating the Reinforcing Properties of Ethanol in Rats without Water Deprivation, Saccharin Fading or Extended Access Training
Published on: January 29, 2017
Galanin and alcohol dependence: neurobehavioral research
M J Lewis1, P Rada, D F Johnson
1Department of Psychology, Princeton University, Green Hall, Princeton, NJ 08544, USA.
Neuropeptides
|May 12, 2005
Summary
Galanin (GAL) injection increases alcohol consumption, and alcohol intake boosts GAL levels in the brain. This suggests GAL systems may drive excessive drinking and alcohol dependence.
Area of Science:
- Neuroscience
- Endocrinology
- Addiction Research
Background:
- Galanin (GAL) influences feeding behavior, increasing food intake.
- Ethanol (EtOH) is a calorie-dense substance and a drug of abuse.
- The role of GAL in alcohol consumption is not fully understood.
Purpose of the Study:
- To investigate the role of galanin (GAL) in alcohol (EtOH) intake.
- To explore the relationship between EtOH consumption and GAL expression in the hypothalamus.
- To determine if GAL systems contribute to alcohol dependence.
Main Methods:
- Microinjection of GAL into the third ventricle and paraventricular nucleus (PVN) in rats.
- Administration of EtOH and assessment of GAL levels.
- Blockade of GAL receptors to observe effects on EtOH consumption.
- Measurement of GAL gene and peptide expression in hypothalamic sites.
Main Results:
- GAL microinjection into the third ventricle and PVN increased EtOH consumption in rats.
- GAL receptor blockade reversed EtOH intake increases.
- EtOH administration and intake elevated GAL expression in the PVN and related hypothalamic areas.
- GAL injection did not increase food intake in rats with chronic alcohol access.
Conclusions:
- GAL systems in the hypothalamus play a significant role in regulating alcohol intake.
- A positive feedback loop exists between alcohol consumption and hypothalamic GAL.
- This GAL-alcohol interaction may contribute to excessive drinking and alcohol dependence.
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