Oxidative damage and stress response from ochratoxin A exposure in rats

Jean Charles Gautier, Daisy Holzhaeuser, Jovanka Markovic, Eric Gremaud, Benoît Schilter, Robert J. Turesky

Research output: Contribution to journalArticlepeer-review

152 Scopus citations

Abstract

Ochratoxin A (OTA) is a mycotoxin found in some cereal and grain products. It is a potent renal carcinogen in male rats, although its mode of carcinogenic action is not known. Oxidative stress may play a role in OTA-induced toxicity and carcinogenicity. In this study, we measured several chemical and biological markers that are associated with oxidative stress response to determine if this process is involved in OTA-mediated toxicity in rats. Treatment of male rats with OTA (up to 2 mg/kg per os, 24 h exposure) did not increase the formation of biomarkers of oxidative damage such as the lipid peroxidation marker malondialdehyde in rat plasma, kidney, and liver, or the DNA damage marker 8-oxo-7,8-dihydro-2′ deoxyguanosine in kidney DNA. However, OTA treatment (1 mg/kg) did result in a 22% decrease in α-tocopherol plasma levels and a 5-fold increase in the expression of the oxidative stress responsive protein haem oxygenase-1, specifically in the kidney. The selective alteration of these latter two markers indicates that OTA does evoke oxidative stress, which may contribute at least in part to OTA renal toxicity and carcinogenicity in rats during long-term exposure.

Original languageEnglish (US)
Pages (from-to)1089-1098
Number of pages10
JournalFree Radical Biology and Medicine
Volume30
Issue number10
DOIs
StatePublished - May 15 2001

Keywords

  • 8-OxodG
  • Free radicals
  • Haem oxygenase-1
  • MDA
  • Ochratoxin A
  • Oxidative stress
  • Vitamin E oxidation

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