Effects of 4-tert-octylphenol on glutathione-related antioxidant status in olive flounder Paralichthys olivaceus
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Effects on glutathione-related antioxidant parameters were examined after a chronic exposure of olive flounder, Paralichthys olivaceus to dietary 4-tert-octylphenol (4-tert-OP). Fish were fed diets containing 4-tert-OP at 0, 1, 5 and 10 mg/kg diet for 6 weeks. Antioxidant parameters examined were reduced glutathione (GSH) contents and enzyme activities of glutathione reductase (GR), glutathione S-transferase (GST) and glutathione peroxidase (GPx) in tissue homogenates of the liver, kidney and gill. It was observed that all parameters examined increased although there were some differences in dose responses and temporal patterns in the increase. GSH contents increased after exposure to 4-tert-OP in the three organs examined. However, the GSH increase was evident only after 4 weeks in the liver whereas it was elevated after 2 weeks in the kidney and gill. GR activity exhibited a significant increase in response to 4-tert-OP at 1 mg/kg in all three organs, however, its activity returned to control levels when exposed to 5 and 10 mg/kg. Hepatic GST activity showed an earlier increase at week 2 in contrast to the kidney and gill where they increased after 4 weeks of 4-tert-OP exposure. Temporal patterns in GPx activity changes to 4-tert-OP exposure were dissimilar among the organs: hepatic activity increased from week 2 through week 6; renal activity increased transiently at week 2; gill levels were higher through weeks 4-6. The results suggest that elevation of several GSH-related antioxidant parameters can be considered as evaluation criteria for 4-tert- OP-induced oxidative stress in a fish.
Abstract
Effects on glutathione-related antioxidant parameters were examined after a chronic exposure of olive flounder, Paralichthys olivaceus to dietary 4-tert-octylphenol (4-tert-OP). Fish were fed diets containing 4-tert-OP at 0, 1, 5 and 10 mg/kg diet for 6 weeks. Antioxidant parameters examined were reduced glutathione (GSH) contents and enzyme activities of glutathione reductase (GR), glutathione S-transferase (GST) and glutathione peroxidase (GPx) in tissue homogenates of the liver, kidney and gill. It was observed that all parameters examined increased although there were some differences in dose responses and temporal patterns in the increase. GSH contents increased after exposure to 4-tert-OP in the three organs examined. However, the GSH increase was evident only after 4 weeks in the liver whereas it was elevated after 2 weeks in the kidney and gill. GR activity exhibited a significant increase in response to 4-tert-OP at 1 mg/kg in all three organs, however, its activity returned to control levels when exposed to 5 and 10 mg/kg. Hepatic GST activity showed an earlier increase at week 2 in contrast to the kidney and gill where they increased after 4 weeks of 4-tert-OP exposure. Temporal patterns in GPx activity changes to 4-tert-OP exposure were dissimilar among the organs: hepatic activity increased from week 2 through week 6; renal activity increased transiently at week 2; gill levels were higher through weeks 4-6. The results suggest that elevation of several GSH-related antioxidant parameters can be considered as evaluation criteria for 4-tert- OP-induced oxidative stress in a fish.
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