Related Experiment Video
Updated: Jun 2, 2026
05:12
Chronic Intermittent Ethanol Vapor Exposure Paired with Two-Bottle Choice to Model Alcohol Use Disorder
Published on: June 23, 2023
The dopamine system in mediating alcohol effects in humans
1Department of Psychiatry and Psychotherapy, Charité Universitätsmedizin Berlin, Charitéplatz 1, Berlin, Germany. katrin.charlet@charite.de
Current Topics in Behavioral Neurosciences
|May 3, 2011
Summary
Chronic alcohol intake alters the brain's dopamine system, leading to alcohol dependence through impaired reward processing and learning. These changes drive alcohol seeking and consumption.
Area of Science:
- Neuroscience
- Psychology
Background:
- Alcohol dependence involves complex interactions between neurotransmitter systems and psychological factors.
- The dopaminergic reinforcement system is crucial in alcohol dependence.
Purpose of the Study:
- To examine the effects of acute and chronic alcohol intake on dopaminergic neurotransmission.
- To understand neuroadaptations in dopaminergic pathways associated with alcohol dependence symptoms.
- To explore how these neurobiological changes influence reward processing, learning, and alcohol-seeking behavior.
Main Methods:
- Review of recent brain-imaging studies.
- Analysis of neurobiological and neurochemical mechanisms.
- Focus on dopaminergic neurotransmission alterations.
Main Results:
- Alcohol intake significantly impacts dopaminergic neurotransmission, with distinct effects for acute versus chronic consumption.
- Chronic alcohol use leads to neuroadaptations that impair reward processing and reinforcement learning.
- Altered dopaminergic signaling increases the salience of alcohol cues, driving compulsive alcohol seeking and consumption.
Conclusions:
- Dopamine system dysregulation is central to the development and maintenance of alcohol dependence.
- Neuroadaptations in reward pathways contribute to the cycle of alcohol seeking and intake.
- Interactions between neurobiology, personality, cognition, and emotion processing are key in alcohol dependence.
Related Concept Videos
01:15Drug Abuse and Addiction: Pharmacological Phenomena
Drug dependence, abuse, and addiction are complex phenomena that can precipitate various abnormal states. Physical dependence refers to a state of pharmacological adaptation to a drug. This adaptation often results in tolerance—a reduced response to the drug after repeated administrations. When the drug use is abruptly stopped, withdrawal symptoms occur due to the body's need to readjust from the pharmacologically induced imbalance. However, tolerance and withdrawal symptoms do not necessarily...
01:27CNS Depressants: Alcohol and Nicotine
Ethanol, a clear colorless alcohol, has been consumed by humans for millennia, but its effects on the body are far from benign. At lower doses, it induces decreased inhibitions and loquaciousness, leading to its social appeal. However, it can cause severe consequences at higher doses, such as coma and respiratory depression, due to its zero-order elimination kinetics. Chronic ethanol abuse wreaks havoc on multiple organ systems, particularly the CNS and the liver. Abrupt cessation of ethanol...
01:29Drugs Affecting Neurotransmitter Synthesis
Drugs affecting neurotransmitter synthesis can impact the adrenergic neuron and the synthesis of neurotransmitters. For example, α-methyltyrosine and carbidopa target specific enzymes involved in catecholamine synthesis. α-methyltyrosine inhibits the enzyme tyrosine hydroxylase, which converts tyrosine into dopamine. By blocking this enzyme, α-methyltyrosine reduces dopamine production and other catecholamines. Carbidopa, on the other hand, inhibits the enzyme dopa decarboxylase, which converts...
01:24Substance Use Disorders Affecting Sleep
Substance use disorders involve a pattern of using drugs more extensively than intended and continuing use despite harmful consequences. This includes legal substances like alcohol and nicotine, as well as illegal drugs. These disorders often involve both physical and psychological dependence, reflecting compulsive use of substances that significantly alter thoughts, feelings, and behaviors, contributing to a major public health issue.
Understanding the concepts of physical dependence,...
Understanding the concepts of physical dependence,...