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Ethanol as a xanthine dehydrogenase inhibitor
T Yamamoto1, Y Moriwaki, S Takahashi
1Third Department of Internal Medicine, Hyogo College of Medicine, Japan.
Metabolism: Clinical and Experimental
|June 1, 1995
Summary
Ethanol inhibits xanthine dehydrogenase, an enzyme crucial for purine metabolism. This inhibition is likely due to increased liver NADH levels caused by ethanol consumption.
Area of Science:
- Biochemistry
- Pharmacology
- Human Physiology
Background:
- Xanthine dehydrogenase (XDH) plays a key role in purine metabolism.
- Ethanol metabolism can influence cellular redox state, potentially affecting enzyme activities.
Purpose of the Study:
- To investigate the effect of ethanol on xanthine dehydrogenase (XDH) activity in humans.
- To elucidate the mechanism underlying ethanol's potential inhibition of XDH.
Main Methods:
- Administration of ethanol and/or inosine to normal subjects.
- Measurement of plasma and urinary purine bases (xanthine, uric acid).
- Assessment of blood lactic acid and pyruvic acid levels.
- Evaluation of pyrazinamide and its metabolites following ethanol administration.
Main Results:
- Combined ethanol and inosine administration showed synergistic increases in xanthine levels.
- Ethanol administration increased the blood lactic acid to pyruvic acid ratio.
- Ethanol decreased plasma and urinary levels of 5-hydroxypyrazinamide and 5-hydroxypyrazinoic acid.
Conclusions:
- Ethanol inhibits xanthine dehydrogenase (XDH) activity in humans.
- The inhibition is likely mediated by an ethanol-induced increase in hepatic cytosolic NADH concentration.
- Ethanol affects purine metabolism and cellular redox state.