Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P47989 (xanthine oxidase)
 8,633 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The effect of superoxide anion-radical and other reactive oxygen species on the metabolism of benzo(a)pyrene was studied with isolated mouse liver microsomes. Reactive oxygen species were generated in vitro by xanthine-xanthine oxidase plus Fe3+ X FeEDTA and benzo(a)pyrene metabolism was followed by reverse-phase high pressure liquid chromatography. The following results were obtained: The reactive oxygen species induced one-electron oxidation of benzo(a)pyrene and increased production of free epoxide as well as protein-binding intermediates. The reactive oxygen species triggered microsomal lipid peroxidation in the presence of Fe3+ X FeEDTA. As a result of microsomal lipid peroxidation a decreased activity of cytochrome P-450, epoxide hydrolase and UDP-glucuronyltransferase was found. It is suggested that active oxygen species changed the balance between bioactivation and conjugation of benzo(a)pyrene metabolites causing accumulation of the epoxide and protein-binding intermediates. The role of iron ions and chelates in this process is discussed.
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PMID:Action of xanthine-xanthine oxidase system on microsomal benzo(a)pyrene metabolism in vitro. 303 65