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The conjugation of 4-nitroquinoline 1-oxide with GSH by human, rat and mouse liver cytosols, by purified mouse GSH transferases and by extrahepatic organ cytosols of male and female mice was investigated. 4-Nitroquinoline 1-oxide was as effectively conjugated by human liver cytosol as was 1-chloro-2,4-dinitrobenzene, at a substrate concentration of 0.1 mM.(More)
2(3)-tert-Butyl-4-hydroxyanisole (BHA) is one of several widely used antioxidant food additives that protect against chemical carcinogenesis and toxicity. The present report concerns the enhancement of dicoumarol-inhibited NAD(P)H:quinone reductase [NAD(P)H dehydrogenase (quinone); NAD(P)H:(quinone acceptor) oxidoreductase, EC 1.6.99.2] activity in mouse(More)
Addition of either 2(3)-tert-butyl-4-hydroxyanlsole (BHA) or I ,2-dlhydro-6-ethoxy-2,2,4-trlmethylquinollne (eth oxyquin) to the diet greatly decreases the bevels of muta genic metabobites of benzo(a)pyrenein CD-I mice.The mutagenic activity of the urinary metabo lites of benzo(a)pyreneis markedlyreduced in the pres ence of glutathionetogetherwiththe(More)
Biochemical characteristics relevant to the differential susceptibilities of liver, heart, and intestine to acute Adriamycin toxicity were examined in female CD-1 mice with and without intravenous Adriamycin (dose range 23-30 mg/kg). The liver which, unlike heart and intestine, is relatively resistant to Adriamycin toxicity, had high levels of glutathione(More)
Investigations in these and other laboratories have estab lished that administration of 2(3)-tert-butyl-4-hydroxyanisole (BHA) to rodents: (a) protects a variety of target tissues against the production of tumors by a wide range of chemical carcin ogens; (b) reduces the levels of mutagenic metabolites pro duced from benzo(a)pyrene and numerous therapeutic(More)
Dicumarol, often used as a specific inhibitor of DT diaphorase (NAD(P)H:(quinone-acceptor) oxidoreductase; EC 1.6.99.2), was found to potently inhibit GSH transferases (EC 2.5.1.18). Dicumarol exhibited an IC50 of 11 microM in inhibiting the conjugation of 1-chloro-2,4-dinitrobenzene (50 microM) by GSH transferase GT-8.7, the major hepatic class mu(More)
Glutathione S-transferase activities in mouse hepatic cytosols are elevated as much as 11-fold following the administration of BHA (2(3)-tert-butyl-4-hydroxyanisole), a widely used antioxidant food additive. Ethoxyquin (1,2-dihydro-6-ethoxy-2,2,4-trimethylquinoline) and disulfiram [bis(diethyldithiocarbamyl)disulfide] also enhance the activities of(More)
Soluble, glutathione-stimulated delta 5-3-ketosteroid isomerase (EC 5.3.3.A) activity of human and rat liver resides in very basic proteins with molecular weights of about 45,000 which are present in high concentrations in these tissues. Physiochemical and immunological evidence is presented for the identity of the proteins responsible for this enzymatic(More)
The effects of the dietary administration of four anticarcinogenic sulfur compounds on the activity of DT-diaphorase, a protective enzyme in quinone and quinoneimine detoxification, have been investigated in female CD-1 mice. Bisethylxanthogen, disulfiram, sodium diethyldithiocarbamate, and benzylisothiocyanate, administered at 0.5% of the diet (by weight)(More)