Hepatic 7-alkoxycoumarin O-dealkylase in mice: induction by beta-naphthoflavone of hepatic enzyme activity.
Hepatic 7-alkoxycoumarin O-dealkylation activities in control and beta-naphthoflavone-pretreated mice were determined. The O-demethylation and O-deethylation activities of 7-alkoxycoumarin in control mice were almost the same values, while the O-depropylation activity was lower than those of the other reactions. The O-dealkylase activity varied markedly among the 18 strains of mice surveyed, and strain-dependent differences in the cytochrome P-450 content were also detected among the strains. beta-Naphthoflavone induced O-dealkylation activity, especially O-deethylation and O-depropylation activities, only in ddY, DS and its substrains (A2-3, A3-1, C1-2 and Nh/+). C3H/He and C57BL/6J strains, but not in DBA/2, BALB/c and KYF/2 strains. The former strains of mice are thus classified as "responsive strains" to beta-naphthoflavone and the latter as "non-responsive strains". The O-dealkylase activity in other strains of mice were not clear in responsiveness to beta-naphthoflavone. The hepatic cytochrome P-450 content in responsive strains also increased upon pretreatment of the animals with beta-haphthoflavone. The results indicate marked strain differences in basal and beta-naphthoflavone-induced activity of hepatic 7-alkoxycoumarin O-dealkylase in mice.
D015660:7-Alkoxycoumarin O-Dealkylase; D000818:Animals; D001571:Benzoflavones / Q000494:pharmacology*; D003433:Crosses, Genetic; D004790:Enzyme Induction; D005419:Flavonoids / Q000494:pharmacology*; D008099:Liver / Q000201:enzymology*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D008813:Mice, Inbred ICR; D008815:Mice, Inbred Strains; D010105:Oxygenases / Q000096:biosynthesis*; D019324:beta-Naphthoflavone
D001571:Benzoflavones; D005419:Flavonoids; D019324:beta-Naphthoflavone; D010105:Oxygenases; D015660:7-Alkoxycoumarin O-Dealkylase