Bioactivation of dapsone to a cytotoxic metabolite by human hepatic microsomal enzymes.

Abstract:

:1. Using human mononuclear leucocytes as target cells, we have investigated the bioactivation of dapsone (DDS) to a cytotoxic metabolite in the presence of microsomes from nine human livers. Values for NADPH dependent toxicity ranged from 8.8-27% (15.8 +/- 5.9%) and were similar to those for microsomes from control mice, 16-24% (19.0 +/- 4.8%). 2. Microsomes prepared from mice induced with either phenobarbitone or beta-naphthoflavone did not produce significantly more NADPH dependent toxicity than microsomes prepared from control mice. 3. Cytotoxicity was abolished not only by ascorbic acid, but also by sub-physiological concentrations of N-acetylcysteine and glutathione. 4. DDS was metabolised in vitro to a hydroxylamine (metabolic conversion 3.1 +/- 1.5%), which was oxidised further to a cytotoxic metabolite which also became irreversibly bound to protein.

journal_name

Br J Clin Pharmacol

authors

Coleman MD,Breckenridge AM,Park BK

doi

10.1111/j.1365-2125.1989.tb03517.x

subject

Has Abstract

pub_date

1989-10-01 00:00:00

pages

389-95

issue

4

eissn

0306-5251

issn

1365-2125

journal_volume

28

pub_type

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