Comparison of the effects of redox cycling and arylating quinones on hepatobiliary function and glutathione homeostasis in rat hepatocyte couplets.

Abstract:

:Menadione (2-methyl-1,4-naphthoquinone, a redox cycling and arylating quinone; 5-100 microM) inhibited the canalicular vacuolar accumulation (CVA) of a fluorescent bile acid, cholyl-lysyl-fluorescein (CLF), in rat hepatocyte couplets. This was associated with depletion of reduced glutathione and accumulation of oxidized glutathione, the latter indicating that the concentrations of menadione used were able to induce oxidative stress. There was no associated cytotoxicity as indicated by ATP content. Treatment of couplets with the redox cycling quinone 2,3-dimethoxy-1,4-naphthoquinone (up to 100 microM) had relatively little effect on CVA, suggesting that the magnitude of reactive oxygen formation induced by this compound was insufficient to disrupt canalicular integrity. In comparison, the arylation of protein thiol groups by p-benzoquinone (up to 100 microM) proved to be more potent in inhibiting canalicular vacuolar accumulation. The predominant mechanism of menadione-induced inhibition of couplet hepatobiliary function is therefore more likely to involve the arylation of critical thiol groups (such as those in the F-actin cytoskeleton) rather than their oxidation. The oxidative effects of menadione could, however, potentiate the deleterious effects induced by arylation, such as by reduced glutathione depletion.

journal_name

Toxicol Appl Pharmacol

authors

Stone V,Coleman R,Chipman JK

doi

10.1006/taap.1996.0117

subject

Has Abstract

pub_date

1996-06-01 00:00:00

pages

195-200

issue

2

eissn

0041-008X

issn

1096-0333

pii

S0041-008X(96)90117-9

journal_volume

138

pub_type

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