Oxidative changes in the liver, brain and lens of lipopolysaccharide-treated rats

E. Sewerynek, M. Abe, L. Chen, G. G. Ortiz, R. J. Reiter

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Oxidative damage in various tissues of LPS-treated rats was studied using the following parameters: changes in reduced (GSH) and oxidized glutathione (GSSG) levels in liver, brain and lens; the activity of glutathione peroxidase (GSH-PX) in both liver and brain; the content of cytochrome P450 reductase in liver. Bacterial LPS was injected i.p. (at a dose of 4 mg/kg BW) 6 h before the animals were killed. One group of rats received N(ω)-nitro-L-arginine methyl ester (L-NAME), an inhibitor of nitric oxide synthase (NOS) (given for 4 days in the drinking water at a concentration of 50 mM); another group received both L-NAME and LPS. In brain and lens no changes in GSH were observed after either LPS,L-NAME or both. In contrast, GSSG and the GSSG/GSH ratio was significantly higher after LPS. This effect was abolished in the brain by L-NAME treatment. The level of the activity of the antioxidative enzyme GSH-PX in brain was significantly higher after L-NAME in LPS-treated animals. Hepatic GSH-PX activity was enhanced after either LPS, L-NAME or treatment with both substances. Additionally, LPS diminished the level of cytochrome P450 reductase with this effect being largely prevented by L-NAME. The results suggest that GSH, as an endogenous antioxidant, may play a major role in combating toxicity of LPS.

Original languageEnglish (US)
Pages (from-to)S109-S115
JournalArchives of Medical Research
Volume26
Issue numberSPEC. ISS.
StatePublished - 1995

Keywords

  • Cytochrome P450
  • Glutathione
  • Glutathione peroxidase
  • Oxidized glutathione
  • Reactive oxygen species

ASJC Scopus subject areas

  • Medicine(all)

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    Sewerynek, E., Abe, M., Chen, L., Ortiz, G. G., & Reiter, R. J. (1995). Oxidative changes in the liver, brain and lens of lipopolysaccharide-treated rats. Archives of Medical Research, 26(SPEC. ISS.), S109-S115.