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Is quinolinic acid an endogenous excitotoxin in alcohol withdrawal?
1Laboratory of Clinical Studies, National Institute of Alcohol Abuse and Alcoholism, Bethesda, MD 20892.
Medical Hypotheses
|October 1, 1991
Summary
Chronic ethanol consumption, especially with liver issues, raises brain tryptophan and quinolinic acid levels. This excitotoxin may reach toxic levels, particularly during alcohol withdrawal and liver damage.
Area of Science:
- Neuroscience
- Toxicology
- Pharmacology
Background:
- Chronic ethanol intake affects brain chemistry.
- Hepatic dysfunction can exacerbate ethanol's effects.
- Tryptophan metabolism is linked to neuroactive compounds.
Purpose of the Study:
- To investigate the impact of chronic ethanol on brain tryptophan and quinolinic acid levels.
- To explore the role of hepatic function in this process.
- To assess the potential for excitotoxicity.
Main Methods:
- Analysis of tryptophan and quinolinic acid levels in brain tissue.
- Assessment of enzyme activity related to quinolinic acid synthesis.
- Correlation with hepatic function and ethanol exposure.
Main Results:
- Chronic ethanol increased brain tryptophan levels, especially with compromised liver function.
- Elevated brain quinolinic acid levels were observed.
- Ethanol may enhance enzymes like tryptophan oxygenase, increasing quinolinic acid synthesis.
Conclusions:
- Ethanol can lead to significant increases in brain quinolinic acid, an NMDA receptor agonist.
- Potentially toxic levels of quinolinic acid may occur in localized brain areas.
- These effects are more pronounced during ethanol withdrawal and in cases of hepatotoxicity.