Related Experiment Video

Updated: Aug 21, 2026

Chronic Intermittent Ethanol Vapor Exposure Paired with Two-Bottle Choice to Model Alcohol Use Disorder
05:12

Chronic Intermittent Ethanol Vapor Exposure Paired with Two-Bottle Choice to Model Alcohol Use Disorder

Published on: June 23, 2023

In the adult CNS, ethanol prevents rather than produces NMDA antagonist-induced neurotoxicity

Nuri B Farber1, Corey Heinkel, William H Dribben

  • 1Department of Psychiatry, Washington University, Campus Box 8134 660 S. Euclid Ave. St. Louis, MO, 63110-1093, USA. farbern@psychiatry.wustl.edu

Brain Research
|November 3, 2004
PubMed

Insights

Ethanol (EtOH) does not cause neurotoxicity in adult brains, unlike in young animals. Instead, it protects adult brains from NMDA antagonist-induced neurotoxicity, suggesting a different mechanism than previously thought.

Area of Science:

  • Neuroscience
  • Toxicology
  • Pharmacology

Background:

  • Single doses of NMDA antagonists induce neurodegeneration in a age-dependent manner.
  • Ethanol (EtOH) blocks NMDA receptors, causing apoptotic neurodegeneration in young animals, potentially contributing to fetal alcohol syndrome.
  • NMDA antagonist-induced neurotoxicity (NAN) is a specific form of neurotoxicity observed only in adult animals.

Purpose of the Study:

  • To investigate if EtOH can induce NAN in adult animals.
  • To explore the protective effects of EtOH against NAN in adult animals.
  • To elucidate the mechanisms underlying EtOH's neuroprotective effects in the adult central nervous system (CNS).

Main Methods:

  • Administered varying doses of EtOH to adult animals, monitoring for neurotoxicity.
  • Investigated EtOH's ability to prevent MK-801 (a potent NMDA antagonist) from inducing NAN in adult animals.
  • Tested the effects of GABA(A) antagonists and non-NMDA glutamate agonists on reversing EtOH's protective effects against NAN.

Main Results:

  • EtOH did not induce NAN in adult animals, even at high blood concentrations known to block NMDA receptors.
  • EtOH demonstrated a dose-dependent protective effect against MK-801-induced NAN in adult animals (ED(50)=138 mg/dl).
  • GABA(A) antagonists and non-NMDA agonists did not significantly reverse EtOH's protective effect.

Conclusions:

  • Acute exposure to EtOH does not cause NAN in the adult CNS, contrasting with its effects in fetuses and young animals.
  • EtOH's neuroprotective effect against NAN in adults may involve mechanisms beyond NMDA receptor antagonism, possibly related to GABA(A) agonism or non-NMDA glutamate antagonism.
  • Further research is needed to fully determine the precise mechanism of EtOH's protective action in the adult CNS due to its broad effects on various receptors and ion channels.

More Related Videos

Construction of Vapor Chambers Used to Expose Mice to Alcohol During the Equivalent of all Three Trimesters of Human Development15:27

Construction of Vapor Chambers Used to Expose Mice to Alcohol During the Equivalent of all Three Trimesters of Human Development

Published on: July 13, 2014

The Use of Trace Eyeblink Classical Conditioning to Assess Hippocampal Dysfunction in a Rat Model of Fetal Alcohol Spectrum Disorders19:57

The Use of Trace Eyeblink Classical Conditioning to Assess Hippocampal Dysfunction in a Rat Model of Fetal Alcohol Spectrum Disorders

Published on: August 5, 2017

Related Concept Videos

CNS Depressants: Alcohol and Nicotine01:27

CNS 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...
Hepatic Encephalopathy01:29

Hepatic Encephalopathy

DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic shunting—including...
Antiepileptic Drugs: Glutamate Antagonists01:14

Antiepileptic Drugs: Glutamate Antagonists

Glutamate is a fundamental neurotransmitter in the central nervous system, playing a vital role in neuronal communication and various cognitive processes. Glutamate stands as the principal excitatory neurotransmitter in the brain. Its presence is crucial for the communication between neurons, underpinning essential processes such as synaptic transmission, neuronal excitability, and plasticity. These functions are vital for higher-order cognitive processes, including learning and memory. The...
Local Anesthetics: Adverse Effects01:12

Local Anesthetics: Adverse Effects

While local anesthetics are generally safe and well-tolerated, they can occasionally cause adverse effects that vary in severity. Local anesthetics can induce toxicity at two distinct levels. They can either produce local effects through direct contact with the neural elements or be absorbed into the bloodstream from the injection site, leading to systemic effects.
Once absorbed into the systemic circulation, local anesthetics can affect the organs that depend on the functioning of sodium...