Aryl hydrocarbon hydroxylase activity levels in the hepatic microsomal fraction from MC- or TCDD-treated mice: a comparison between aromatic hydrocarbon responsive and non-responsive strains

doi:10.1016/0378-4274(90)90167-K

Toxicology Letters

Volume 52, Issue 1, June 1990, Pages 73-80

https://doi.org/10.1016/0378-4274(90)90167-K Get rights and content

Abstract

The effects of in vivo administration of polycyclic aromatic hydrocarbons on the levels of aryl hydrocarbon hydroxylase (AHH) activity in aromatic hydrocarbon (Ah) responsive and non-responsive strains of mice were studied using the hepatic microsomal fraction. Injection of 3-methylcholanthrene (MC; 42 $mg kg$ body wt.) or 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD; 120 $μg kg$ body wt.) into both strains produced marked enhancement of AHH activity except for MC treatment of Ah non-responsive strains. Addition of 7,8-benzoflavone (BNF) to the microsomal AHH assay mixture prepared from mice previously injected with vehicle (olive oil) alone caused an increase in activity when the mice were responsive, while BNF lowered the activity in non-responsive strains. With regard to MC-injected mice, BNF and 3-methyl-sulphonyl-4,5,3',4'-tetrachlorobiphenyl (3-MSF-TCB) decreased microsomal AHH activity in Ah-responsive mice, whereas these drugs enhanced the activity in Ah-non-responsive strains. 3-MSF-TCB also had inhibitory potency on AHH activity, but the mechanism of inhibition seems to be somewhat different from that of BNF. It may also suggest that cytochrome P-450 isozymes inhibited by BNF are different from those inhibited by 3-MSF-TCB.

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Aryl hydrocarbon hydroxylase activity levels in the hepatic microsomal fraction from MC- or TCDD-treated mice: a comparison between aromatic hydrocarbon responsive and non-responsive strains

Abstract

J. Biol. Chem.

Arch. Biochem. Biophys.

J. Biol. Chem.

Arch. Biochem. Biophys.

Pharmacological implications of microsomal enzyme induction

Pharmacol. Rev.

Substrate-inducible microsomal aryl hydrocarbon hydroxylase in mammalian cell culture. 2. Cellular responses during enzyme induction

J. Biol. Chem.