Microsomal styrene mono-oxygenase and styrene epoxide hydrase activities in rats

M. Salmona, J. Pachecka, L. Cantoni, G. Belvedere, E. Mussini, S. Garattini

Research output: Contribution to journalArticlepeer-review


1. Styrene epoxide formation and styrene epoxide hydration have been studied in liver, lung, kidney, heart, spleen and brain of female and male rats. 2. Styrene epoxide formation is NADPH-dependent although it is enhanced when NADH is added together with NADP. This enzymic activity is inhibited by metyrapone and SKF 525-A but not by the effective inhibitors of epoxide hydrase, l,2-epoxy-3,3,3-trichloropropene and cyclohexene oxide. 3. Known inducers of liver microsomal mono-oxygenases show a different activity on the two enzymes. Phenobarbital increases both formation and hydration of styrene epoxide; and carbamazepine increase the hydration but not the formation of styrene epoxide; a steroid contraceptive combination (lynestrenol + mestranol) increases styrene epoxide formation while it inhibits epoxide hydrase; 3-methylcholanthrene does not affect either of the activities.

Original languageEnglish
Pages (from-to)585-591
Number of pages7
Issue number10
Publication statusPublished - 1976

ASJC Scopus subject areas

  • Pharmacology
  • Toxicology
  • Biochemistry
  • Health, Toxicology and Mutagenesis
  • Biochemistry, Genetics and Molecular Biology(all)


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