Related Experiment Video
Updated: Jul 14, 2026
08:13
Flypub To Study Ethanol Induced Behavioral Disinhibition and Sensitization
Published on: May 18, 2020
Stress, ethanol, and neuroactive steroids.
Giovanni Biggio1, Alessandra Concas, Paolo Follesa
1Department of Experimental Biology, Center of Excellence for the Neurobiology of Dependence, University of Cagliari, Cagliari, Italy. biggio@unica.it
Pharmacology & Therapeutics
|June 9, 2007
Summary
Stress, ethanol, and neuroactive steroids interact to alter GABAergic neurotransmission. Understanding these neurosteroid mechanisms offers insights into anxiety and potential new treatments.
Area of Science:
- Neuroscience
- Pharmacology
- Molecular Biology
Background:
- Neurosteroids modulate neurotransmitter actions, influencing stress and alcohol dependence.
- GABAergic inhibitory neurotransmission is a key target for neurosteroid action.
Purpose of the Study:
- To review the molecular mechanisms underlying the interaction of stress, ethanol, and neuroactive steroids.
- To elucidate how these interactions induce plastic changes in GABA(A) receptors.
- To provide insights into the modulation of GABAergic synapses by ethanol and stress.
Main Methods:
- In vivo and in vitro experimental models were used.
- Analysis of neurosteroid levels and GABA(A) receptor gene expression and function under stress.
- Investigation of ethanol-stimulated neurosteroidogenesis.
- Assessment of GABA(A) receptor plasticity following ethanol exposure.
Main Results:
- Acute and chronic stress affect peripheral and brain neurosteroid levels and GABA(A) receptor function.
- Ethanol stimulates neurosteroid production in the brain.
- GABA(A) receptors exhibit plasticity in response to acute and chronic ethanol exposure.
Conclusions:
- The interplay between stress, ethanol, and neurosteroids induces molecular and functional changes in GABAergic neurotransmission.
- Understanding these mechanisms can illuminate the pathophysiology of anxiety disorders.
- These findings may guide the development of novel anxiolytic, hypnotic, and anticonvulsant drugs with reduced side effects.
Related Concept Videos
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...
01:22CNS Stimulants: Psychedelic Agents
Hallucinogens, also known as psychedelic drugs, are a class of substances known for their ability to alter perception, cognition, and emotions. Despite their profound effects on the mind, these drugs are non-addictive, setting them apart from many other abused substances. The mechanism of action of these drugs lies in their impact on the 5-HT2A receptor in the brain. Upon activation, this receptor couples to Gq-type G proteins, triggering a cascade that releases intracellular calcium. This...
01:24CNS Stimulants: Cocaine, Amphetamines and Cannabinoids
CNS stimulants, such as cocaine, amphetamines, and cannabinoids, have varying structures and mechanisms of action that lead to different therapeutic effects and side effects. Cocaine, with its molecular formula C17H21NO4, is a tropane alkaloid and a tertiary amino compound. It has two chemical forms: the hydrochloride salt and the "freebase." The former is in powder form, while the latter involves removing the hydrochloride salt to create a form that can be smoked. Cocaine exerts its effects by...
01:29Stimulants
Stimulants are substances that enhance neural activity and elevate dopamine levels in the brain, leading to their highly addictive nature. These drugs include cocaine, amphetamines, MDMA, caffeine, and nicotine, each with distinct mechanisms of action and varied health implications.
Cocaine can be administered via snorting, injection, or smoking. It primarily functions by blocking the reuptake of dopamine, resulting in a euphoric high characterized by an intense sensation of happiness and...
Cocaine can be administered via snorting, injection, or smoking. It primarily functions by blocking the reuptake of dopamine, resulting in a euphoric high characterized by an intense sensation of happiness and...
01:28Depressants
Depressant drugs, including alcohol and sedative-hypnotics, diminish central nervous system activity by enhancing the action of gamma-aminobutyric acid (GABA), a neurotransmitter that reduces brain activity and promotes relaxation. These substances can have various therapeutic uses but also pose significant risks, especially when misused or combined.
Alcohol is a common depressant that can induce a sense of relaxation and reduced inhibition at low doses. Contrary to its occasional...
Alcohol is a common depressant that can induce a sense of relaxation and reduced inhibition at low doses. Contrary to its occasional...
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...