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Microdialysis of Ethanol During Operant Ethanol Self-administration and Ethanol Determination by Gas Chromatography
Published on: September 5, 2012
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Changes in Brain Dopamine Extracellular Concentration after Ethanol Administration; Rat Microdialysis Studies
Abdelkader Dahchour1, Roberta J Ward2
1Department of Biology, Faculty of Sciences, Clinical Neurosciences Laboratory, Faculty of Medicine and Pharmacy. Sidi Mohamed Ben Abdellah University, Imouzzer Road, Fez 30000, Morocco.
Alcohol and Alcoholism (Oxford, Oxfordshire)
|October 25, 2021
Summary
Ethanol intake alters dopamine levels in the brain, with acute doses increasing dopamine transmission. Alcohol withdrawal significantly decreases dopamine, potentially driving cravings and addiction.
Area of Science:
- Neuroscience
- Pharmacology
- Addiction Research
Background:
- The dopaminergic system plays a crucial role in reward and motivation.
- Alcohol abuse and withdrawal significantly impact neurotransmitter systems.
- Understanding dopamine's role in alcohol dependence is critical for developing effective treatments.
Purpose of the Study:
- To review microdialysis studies examining dopaminergic system alterations during alcohol intoxication and withdrawal.
- To compare dopamine changes in animals with and without alcohol preference.
- To elucidate the role of dopamine in alcohol dependence and addiction.
Main Methods:
- Microdialysis was used to measure dopamine concentrations in animal models.
- Studies included various routes of ethanol administration (intraperitoneal, intravenous, oral, direct NAc infusion).
- Animal models encompassed different states: acute intoxication, chronic consumption, withdrawal, and selective breeding for alcohol preference.
Main Results:
- Acute ethanol administration increased mesolimbic dopamine transmission.
- Chronic alcohol consumption showed variable effects on basal dopamine.
- Ethanol withdrawal significantly reduced basal dopamine content, potentially increasing cravings.
- Animals bred for alcohol preference exhibited enhanced ethanol-evoked dopamine responses.
Conclusions:
- Microdialysis provides key insights into ethanol-induced dopamine release in alcohol abuse models.
- Acute ethanol increases dopamine, while withdrawal decreases it, impacting dependence and addiction.
- Dopamine fluctuations contribute to susceptibility to withdrawal and addiction by altering responses to normal dopamine signaling.
