title: cis- and trans-1,2-diphenylaziridines: induction of xenobiotic-metabolizing enzymes in rat liver and mutagenicity in Salmonella typhimurium.
abstract: trans-Stilbene imine (trans-1,2-diphenylaziridine) is the nitrogen analog of trans-stilbene oxide, a potent inducer of several microsomal and cytosolic xenobiotic-metabolizing enzymes. Although the acute toxicity of cis- and trans-stilbene imines prevents their application at the usual dose for trans-stilbene oxide (400 mg/kg/day), it is apparent that the imines nevertheless potently induce several xenobiotic-metabolizing enzymes in rat liver. The IP administration of trans-stilbene imine resulted in statistically significant increases in the activities of aminopyrine N-demethylase, microsomal epoxide hydrolase, glutathione transferase (toward 1-chloro-2,4-dinitrobenzene, 1,2-dichloro-4-nitrobenzene and delta 5-androstene-3,17-dione) and UDP-glucuronosyltransferase (toward testosterone). cis-Stilbene imine was less potent in inducing these activities. Although trans-stilbene imine (total dose = 400 mg/kg) was more potent than trans-stilbene oxide (total dose = 1200 mg/kg) in inducing the activities of glutathione transferase (toward 1-chloro-2,4-dinitrobenzene) and UDP-glucuronosyltransferase (toward testosterone), both compounds belong to the class of substances which are more potent inducers of conjugating (phase II) enzymes. Because of their structural similarity with K-region arene imines which are potent mutagens, cis-stilbene imine and trans-stilbene imine were investigated for mutagenicity (reversion of his- strains of Salmonella typhimurium). cis-Stilbene imine and trans-stilbene imine were direct mutagens in the strain TA100. This result, and the finding that acenaphthene 1,2-imine efficiently reverts various strains of Salmonella typhimurium, demonstrates that not only K-region arene imines, but also other aziridines substituted at the two carbons with aromatic moieties, are mutagenic.
mesh_terms: D000818:Animals; D001388:Aziridines / Q000633:toxicity*; D001389:Azirines / Q000633:toxicity*; D004790:Enzyme Induction / Q000187:drug effects*; D008099:Liver / Q000187:drug effects* / Q000201:enzymology; D008297:Male; D009152:Mutagenicity Tests; D009153:Mutagens; D051381:Rats; D011919:Rats, Inbred Strains; D012486:Salmonella typhimurium / Q000187:drug effects / Q000235:genetics; D013237:Stereoisomerism
chemical_list: D001388:Aziridines; D001389:Azirines; D009153:Mutagens; C051706:1,2-diphenylaziridine