Suppression of endogenous antioxidant enzymes by 2,3,7,8- tetrachlorodibenzo-p-dioxin-induced oxidative stress in chicken liver during development

J. Lim, J. C. DeWitt, R. A. Sanders, J. B. Watkins, D. S. Henshel

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Domestic chickens (Gallus gallus) are an excellent model in which to evaluate developmental toxicity and oxidative stress because of their high sensitivity to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). The goal of this study was to measure the effects of environmentally relevant doses of TCDD on endogenous hepatic antioxidant enzyme activity in hatchling chickens. The vehicle (sunflower oil) or 2, 20, or 200 pg/g TCDD was injected into chicken eggs before incubation. On hatching, livers were harvested and quickly frozen. The changes in activity of antioxidant enzymes, including glutathione peroxidase (GPx), glutathione reductase (GRx), copper zinc superoxide dismutase (SOD), and catalase (CAT) were determined as indicators of oxidative stress. TCDD exposure was associated with a significant suppression of the activities of the protective endogenous enzymes GPx, GRx, and SOD in the liver, even at the lowest dose. CAT activity was also suppressed, but not significantly. The measured decreases were 37% to 63% for GPx, 50% to 58% for GRx, 30% to 40% for SOD, and 16% to 24% for CAT. Noncomplex dose-response relationships were evident in GPx and GRx, whereas SOD and CAT curves were U-shaped. These results demonstrate that a decreased ability to scavenge reactive oxygen species may result from developmental TCDD exposure at very low doses, contributing to oxidative stress and thus to the embryotoxicity of TCDD.

Original languageEnglish
Pages (from-to)590-595
Number of pages6
JournalArchives of Environmental Contamination and Toxicology
Volume52
Issue number4
DOIs
StatePublished - May 2007

Fingerprint

Oxidative stress
Antioxidants
Liver
dioxin
antioxidant
Chickens
Oxidative Stress
Enzymes
enzyme
Glutathione Peroxidase
Catalase
Superoxide Dismutase
Sunflower oil
Enzyme activity
Glutathione Reductase
dose-response relationship
Toxicity
Zinc
Eggs
enzyme activity

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry
  • Toxicology

Cite this

Suppression of endogenous antioxidant enzymes by 2,3,7,8- tetrachlorodibenzo-p-dioxin-induced oxidative stress in chicken liver during development. / Lim, J.; DeWitt, J. C.; Sanders, R. A.; Watkins, J. B.; Henshel, D. S.

In: Archives of Environmental Contamination and Toxicology, Vol. 52, No. 4, 05.2007, p. 590-595.

Research output: Contribution to journalArticle

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