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The role of prostaglandin endoperoxide synthetase in the in vivo activation of benzo(a)pyrene to reactive metabolites capable of interacting irreversibly with cellular macromolecules was studied in guinea pig liver, lung, kidney, spleen, small intestine, colon, and brain. DNA and protein covalent binding experiments were made after systemic administration of acetylsalicylic acid (200 mg/kg) followed by radiolabeled benzo(a)pyrene (4 microgram/kg). Results are compared with a control situation in which the prostaglandin endoperoxide synthetase inhibitor (acetylsalicylic acid) was not administered. No decrease in the level of DNA or protein benzo(a)pyrene-derived covalent binding was observed in any of the tissues studied.
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