Lead intoxication: Antioxidant defenses and oxidative damage in rat brain

V. N. Adonaylo, P. I. Oteiza

Research output: Contribution to journalArticle

232 Scopus citations

Abstract

Oxidative damage associated with the presence of lead (Pb) in the brain has been proposed as one possible mechanism involved in Pb toxicity. To investigate this hypothesis, we examined the long-term effects of Pb2+ on parameters of oxidative stress in the brain from rats chronically exposed to the metal (1 g Pb acetate/l drinking water). After 8 weeks of treatment, Pb2+-intoxicated rats (blood Pb concentration >100 μg/dl) showed lower body weight, and lower hematocrit and 5-aminolevulinic acid dehydratase activity as compared to controls. The content of brain 2-thiobarbituric acid-reactive substances (TBARS), an indicator of lipid oxidation, was significantly (P<0.05) higher in the Pb2+-intoxicated animals than in controls. Higher activities of the antioxidant enzymes glutathione reductase and glutathione peroxidase, and a lower (44%) level of ubiquinol 10 were found in the brain of the Pb2+-treated rats, compared to controls. A negative correlation between brain ubiquinol 9 (r2=0.79), 10 (r2=0.84) and blood Pb concentration was observed. Brain α-tocopherol levels, superoxide dismutase activity and parameters of oxidative damage to proteins were similar between control and Pb2+-treated rats. The present results indicate that chronic Pb2+ intoxication induces an oxidative stress situation in rat brain. Copyright (C) 1999 Elsevier Science Ireland Ltd.

Original languageEnglish (US)
Pages (from-to)77-85
Number of pages9
JournalToxicology
Volume135
Issue number2-3
DOIs
StatePublished - Jul 15 1999
Externally publishedYes

Keywords

  • Antioxidants
  • Free radicals
  • Lead intoxication
  • Neurotoxicity

ASJC Scopus subject areas

  • Toxicology

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