title: Dose-related induction of rat hepatic drug-metabolizing enzymes by diuron and chlorotoluron, two substituted phenylurea herbicides.
abstract: Dose-related induction of various hepatic drug-metabolizing enzymes has been investigated after short-term treatment of rats by diuron and chlorotoluron, a dichlorinated and a monochlorinated phenylurea herbicide, respectively. Results suggest that 'saturation' of the induction system of benzo(a)pyrene monooxygenase, 7-ethoxycoumarin O-deethylase and 7-ethoxyresorufin O-deethylase activities may occur in the same range of the molar doses of both compounds, and with the dichlorinated herbicide at much higher activities. Induction of epoxide hydrolase, UDP-glucuronyltransferase and glutathione S-transferases also shows saturation curves in the function of molar doses. However, the structural difference is not reflected in the enhancement of enzyme activities.
authors.affiliation: Department of Biochemistry, National Institute of Hygiene, Budapest, Hungary.
authors.forename: B
authors.initials: B
authors.lastname: Schoket
authors.forename: I
authors.initials: I
authors.lastname: Vincze
mesh_terms: D015660:7-Alkoxycoumarin O-Dealkylase / Q000096:biosynthesis; D000633:Aminopyrine N-Demethylase / Q000096:biosynthesis; D000818:Animals; D001579:Benzopyrene Hydroxylase / Q000096:biosynthesis; D019363:Cytochrome P-450 CYP1A1; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis; D004237:Diuron / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004790:Enzyme Induction / Q000187:drug effects; D004851:Epoxide Hydrolases / Q000096:biosynthesis; D014453:Glucuronosyltransferase / Q000096:biosynthesis; D005982:Glutathione Transferase / Q000096:biosynthesis; D006540:Herbicides / Q000494:pharmacology*; D008099:Liver / Q000187:drug effects / Q000201:enzymology*; D008297:Male; D006899:Mixed Function Oxygenases / Q000096:biosynthesis; D015394:Molecular Structure; D010088:Oxidoreductases / Q000096:biosynthesis; D010671:Phenylurea Compounds / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D006540:Herbicides; D010671:Phenylurea Compounds; D003577:Cytochrome P-450 Enzyme System; D004237:Diuron; D006899:Mixed Function Oxygenases; D010088:Oxidoreductases; C019647:aldrin epoxidase; D015660:7-Alkoxycoumarin O-Dealkylase; D001579:Benzopyrene Hydroxylase; D019363:Cytochrome P-450 CYP1A1; D000633:Aminopyrine N-Demethylase; D014453:Glucuronosyltransferase; D005982:Glutathione Transferase; D004851:Epoxide Hydrolases; C007033:chlortoluron