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• W2072688910 abstract "Prostaglandin H synthase (PHS) catalyzes the oxidation of arachidonic acid to prostaglandin H2 in reactions which utilize two activities, a cyclooxygenase and a peroxidase. These enzymatic activities generate enzyme- and substrate-derived free radical intermediates which can oxidize xenobiotics to biologically reactive intermediates. As a consequence, in the presence of arachidonic acid or a peroxide source, PHS can bioactivate many chemical carcinogens to their ultimate mutagenic and carcinogenic forms. In general, PHS-dependent bioactivation is most important in extrahepatic tissues with low monooxygenase activity such as the urinary bladder, renal medulla, skin and lung. Mutagenicity assays are useful in the detection of compounds which are converted to genotoxic metabolites during PHS oxidation. In addition, the oxidation of xenobiotics by PHS often form metabolites or adducts to cellular macromolecules which are specific for peroxidase- or peroxyl radical-dependent reactions. These specific metabolites and/or adducts have served as biological markers of xenobiotic bioactivation by PHS in certain tissues. Evidence is presented which supports a role for PHS in the bioactivation of several polycyclic aromatic hydrocarbons and aromatic amines, two classes of carcinogens which induce extrahepatic neoplasia. It should be emphasized that the toxicities induced by PHS-dependent bioactivation of xenobiotics are not limited to carcinogenicity. Examples are given which demonstrate a role for PHS in pulmonary toxicity, teratogenicity, nephrotoxicity and myelotoxicity." @default.
• W2072688910 created "2016-06-24" @default.
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• W2072688910 creator A5040852432 @default.
• W2072688910 creator A5064125146 @default.
• W2072688910 date "1991-01-01" @default.
• W2072688910 modified "2023-10-15" @default.
• W2072688910 title "Bioactivation of xenobiotics by prostaglandin H synthase" @default.
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• W2072688910 doi "https://doi.org/10.1016/0009-2797(91)90108-j" @default.
• W2072688910 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1913972" @default.
• W2072688910 hasPublicationYear "1991" @default.
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