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[Hepatic allopurinol oxidizing enzyme in mice]
Nihon Yakurigaku Zasshi. Folia Pharmacologica Japonica
|March 1, 1975
Summary
This study demonstrates that aldehyde oxidase catalyzes the oxidation of both allopurinol and N-methylnicotinamide in mice. Evidence suggests a single enzyme is responsible for these distinct oxidation reactions.
Area of Science:
- Biochemistry
- Enzymology
- Pharmacology
Context:
- Aldehyde oxidase (AO) is a key enzyme involved in the metabolism of various xenobiotics and endogenous compounds.
- Understanding the substrate specificity of AO is crucial for predicting drug metabolism and potential drug-drug interactions.
- Previous research has suggested potential overlap in substrates for AO, but definitive evidence in vivo was limited.
Purpose:
- To investigate whether allopurinol and N-methylnicotinamide are oxidized by the same enzyme in mice.
- To provide biochemical and physiological evidence supporting the identity of the enzyme responsible for these oxidation pathways.
Summary:
- Multiple lines of evidence indicate that aldehyde oxidase (aldehyde-oxygen oxidoreductase EC, 1.2.3.1.) catalyzes the oxidation of both allopurinol and N-methylnicotinamide in mice.
- Similarities in postnatal activity changes, parallel increases with sexual maturity, and identical inactivation rates by heat and dexamethasone support a single enzyme.
- Inhibitor studies, substrate competition assays, and parallel activity increases during purification further confirm that AO is responsible for both oxidation processes, independent of xanthine oxidase.
Impact:
- Clarifies the enzymatic basis for allopurinol and N-methylnicotinamide metabolism in mice.
- Provides a foundation for understanding the role of aldehyde oxidase in drug metabolism and disposition.
- Highlights the importance of considering aldehyde oxidase activity in the development and use of drugs metabolized by this enzyme.