Effect of thiols on lipid peroxidation in rat liver microsomes

G R Haenen, N P Vermeulen, H Timmerman, A Bast

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The stimulatory or inhibitory effects of various thiol compounds on in vitro lipid peroxidation by iron-ascorbate in rat liver microsomes were determined. Glutathione had no measurable pro-oxidant capacity, in contrast, it protected against lipid peroxidation. N-Acetyl l-cysteine and S-methyl-glutathione had no effect on in vitro lipid peroxidation. l-Cysteine stimulated lipid peroxidation and also of d-penicillamine and dl-dithiothreitol the pre-oxidant capacity predominated the anti-oxidant capacity. Cysteamine afforded a pronounced protection against in vitro lipid peroxidation. In contrast to the labile character of the glutathione dependent protection, the protection by cysteamine was not affected by heat-pretreatment of the liver microsomes or alkylating protein sulfhydryl groups by N-ethyl maleimide. Again in contrast to glutathione, the protection against in vitro microsomal lipid peroxidation by cysteamine was not reduced after in vivo lipid peroxidation induced by CC14. This suggests that even after the process of lipid peroxidation has been started, administration of cysteamine might still be beneficial.

Original languageEnglish
Pages (from-to)201-12
Number of pages12
JournalChemico-Biological Interactions
Volume71
Issue number2-3
DOIs
Publication statusPublished - 1989

Keywords

  • Acetylcysteine
  • Animals
  • Cysteamine
  • Cysteine
  • Dithiothreitol
  • Glutathione
  • Kinetics
  • Lipid Peroxidation
  • Male
  • Microsomes, Liver
  • Penicillamine
  • Rats
  • Rats, Inbred Strains
  • Structure-Activity Relationship
  • Sulfhydryl Compounds
  • Journal Article

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