@article {Wolff301, author = {T Wolff and E Deml and H Wanders}, title = {Aldrin epoxidation, a highly sensitive indicator specific for cytochrome P-450-dependent mono-oxygenase activities.}, volume = {7}, number = {5}, pages = {301--305}, year = {1979}, publisher = {American Society for Pharmacology and Experimental Therapeutics}, abstract = {Aldrin epoxidation was studied in rat liver microsomes. The assay is very sensitive; amounts of less than 1 microgram of microsomal protein were sufficient for activity determination. The very low background, stability of the metabolite, and the complete separation of substrate and metabolite permit estimation of mono-oxygenase activities of less than 1 pmol per mg of protein per min by a simple procedure. Pretreatment of animals with the mono-oxygenase inducer phenobarbital (PB) increased the epoxidation rate 3-fold, whereas 3-methylcholanthrene (MC) treatment markedly depressed enzyme activity. Induction with MC did not change the apparent Km of the reaction, which was 18 muM. The Km in microsomes from PB-treated animals was 28 muM. These data suggest that the same or (a) similar form(s) of mono-oxygenase catalyze(s) the epoxidation in the three different microsomal preparations. SKF 525-A, metyrapone, and 7,8-benzoflavone were almost similarly active as inhibitors in microsomes from control and inducer-treated rats. Sensitivity to these inhibitors was low; 0.7 mM SKF 525-A and 0.4 mM 7,8-benzoflavone were necessary to reduce enzyme activity by 50\%, whereas 0.5 mM metyrapone caused an inhibition of 10-45\%. The activity of aldrin epoxidation in untreated rats increased almost parallel to the activity of ethylmorphine demethylation between 3 and 10 weeks of age. The rate of benzo[a]pyrene hydroxylation remained unchanged during this period. The results demonstrate that aldrin epoxidation offers a selective and sensitive assay for the activity of mono-oxygenases dependent on cytochrome P-450 forms.}, issn = {0090-9556}, URL = {https://dmd.aspetjournals.org/content/7/5/301}, eprint = {https://dmd.aspetjournals.org/content/7/5/301.full.pdf}, journal = {Drug Metabolism and Disposition} }