title: Reductive metabolism of stilbene oxide and styrene oxide to the olefins in rats.
abstract: The present study provides the first evidence that stilbene oxide and styrene oxide are reductively metabolized to the corresponding olefins in rats. When cis- or trans-stilbene oxide was given orally to rats, both cis- and trans-stilbene were isolated from the urine and feces. Styrene was also isolated from the urine and feces of rats given styrene oxide. These metabolites were identified unequivocally by UV and mass spectral comparison with authentic samples, and on the basis of their TLC and HPLC behavior. However, these olefins were not detected in the urine or feces of antibiotics-treated rats dosed with cis- or trans-stilbene oxide. Cecal contents of the untreated rats exhibited olefin oxide reductase activities toward cis- and trans-stilbene oxides under anaerobic conditions. The results suggest that intestinal bacteria play an important role in the reduction of olefin oxides to the corresponding olefins in the animal body.
authors.affiliation: Institute of Pharmaceutical Science, Hiroshima University School of Medicine, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Kitamura
authors.forename: Y
authors.initials: Y
authors.lastname: Shiraishi
authors.forename: M
authors.initials: M
authors.lastname: Mita
authors.forename: H
authors.initials: H
authors.lastname: Sueki
authors.forename: C
authors.initials: C
authors.lastname: Maeda
authors.forename: K
authors.initials: K
authors.lastname: Tatsumi
mesh_terms: D000475:Alkenes / Q000378:metabolism* / Q000652:urine; D000818:Animals; D001711:Biotransformation; D002851:Chromatography, High Pressure Liquid; D002855:Chromatography, Thin Layer; D004852:Epoxy Compounds / Q000378:metabolism* / Q000652:urine; D005243:Feces / Q000737:chemistry; D008297:Male; D013058:Mass Spectrometry; D010084:Oxidation-Reduction; D051381:Rats; D017208:Rats, Wistar; D013056:Spectrophotometry, Ultraviolet; D013267:Stilbenes / Q000378:metabolism* / Q000652:urine
chemical_list: D000475:Alkenes; D004852:Epoxy Compounds; D013267:Stilbenes; C013690:styrene oxide; C025906:stilbene oxide