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Role of 3,4-dichlorophenyl methyl sulfone, a metabolite of o-dichlorobenzene, in the changes in hepatic microsomal drug-metabolizing enzymes caused by o-dichlorobenzene administration in rats.

Abstract：

:2,3- and 3,4-Dichlorophenyl methyl sulfoxides and 2,3- and 3,4-dichlorophenyl methyl sulfones (2,3- and 3,4-DCPSO2Mes) were detected in the urine of rats administered o-dichlorobenzene (o-DCB). After administration of o-DCB to rats, swift decreases were observed in the concentrations of o-DCB in blood, liver, and kidneys, whereas 3,4-DCPSO2Me appeared in blood, liver, kidneys, and adipose tissue. The concentrations of 3,4-DCPSO2Me in the blood and three tissues reached maxima at 24 hr. Both aminopyrine N-demethylase and aniline hydroxylase activities and cytochrome P450 content of hepatic microsomes decreased 24 hr after administration of o-DCB. In contrast, 3,4-DCPSO2Me increased the activities of these enzymes and cytochrome P450 and b5 contents in rat liver microsomes. In both antibiotic-pretreated and bile duct-cannulated rats dosed with o-DCB, the concentrations of 2,3- and 3,4-DCPSO2Mes in blood, liver, kidneys, and adipose tissue were dramatically reduced. These findings suggest that the process of formation of methylsulfonyl metabolites of o-DCB involves biliary secretion of DCPSO2Mes and/or their precursors which will be subjected to metabolism by intestinal microflora. In antibiotic-pretreated rats, the inhibitory effects of o-DCB administration on the activities of aminopyrine- and aniline-metabolizing enzymes and the contents of cytochromes P450 and b5 in hepatic microsomes were greater than those observed in the intact rats. In bile duct-cannulated rats, the decrease in aminopyrine N-demethylase activity after administration of o-DCB was greater than that observed in the intact rats. These findings suggest that the apparent inhibition of drug-metabolizing enzymes by o-DCB is the result of simultaneous contrary effects, namely, the inductive effect of 3,4-DCPSO2Me and the stronger inhibitory effect of an unknown factor(s) on drug-metabolizing enzymes.

journal_name

Toxicol Appl Pharmacol

journal_title

Toxicology and applied pharmacology

authors

Kato Y,Kimura R

doi

10.1006/taap.1997.8191

subject

Has Abstract

pub_date

1997-08-01 00:00:00

pages

277-84

issue

2

eissn

0041-008X

issn

1096-0333

pii

S0041-008X(97)98191-6

journal_volume

145

pub_type

杂志文章

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