Catalase inhibition by amino triazole induces oxidative stress in goldfish brain.
The effects of in vivo inhibition of catalase by 3-amino 1,2,4-triazole (AMT) on the levels of damage products resulting from reactive oxygen species attack on proteins and lipids as well as on the activities of five antioxidant and associated enzymes were studied in the brain of goldfish, Carassius auratus. Intraperitoneal injection of AMT at a concentration of 0.1 mg/g wet weight caused a gradual decrease in brain catalase activity over 72 h, whereas higher AMT concentrations (0.5 or 1.0 mg/g) reduced catalase activity by about two-thirds within 5-10 h. AMT effects on antioxidant enzyme activities and oxidative stress markers were studied in detail using fish treated with 0.5 mg/g AMT for 24 or 168 h. The levels of thiobarbituric acid-reactive substances (a lipid damage product) increased 6.5-fold by 24 h after AMT injection but fell again after 168 h. The content of carbonylproteins (CP) also rose within 24 h (by approximately 2-fold) and remained 1.5-fold higher compared with respective sham-injected fish after 168 h. CP levels correlated inversely with catalase activity (R(2) = 0.83) suggesting that catalase may protect proteins in vivo against oxidative modification. The activities of both glutathione peroxidase and glutathione-S-transferase increased by approximately 50% and 80%, respectively, in brain of AMT-treated fish and this might represent a compensatory response to lowered catalase activity. Possible functions of catalase in the maintenance of prooxidant/antioxidant balance in goldfish brain are discussed.
Bagnyukova
Tetyana V
TV
Department of Biochemistry, Institute of Natural Sciences, Vassyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine.
Vasylkiv
Olena Yu
OY
Storey
Kenneth B
KB
Lushchak
Volodymyr I
VI
D000429:Alcohol Oxidoreductases / Q000378:metabolism; D000449:Aldehyde Reductase; D000074408:Aldo-Keto Reductases; D000640:Amitrole / Q000494:pharmacology*; D000818:Animals; D001921:Brain / Q000187:drug effects* / Q000378:metabolism; D001923:Brain Chemistry / Q000187:drug effects*; D002374:Catalase / Q000037:antagonists & inhibitors*; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D005260:Female; D005982:Glutathione Transferase / Q000378:metabolism; D006054:Goldfish; D008297:Male; D018384:Oxidative Stress / Q000187:drug effects*; D013223:Statistics as Topic; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism; D013997:Time Factors
D004791:Enzyme Inhibitors; D017392:Thiobarbituric Acid Reactive Substances; D000429:Alcohol Oxidoreductases; D000074408:Aldo-Keto Reductases; D000449:Aldehyde Reductase; D002374:Catalase; D005982:Glutathione Transferase; D000640:Amitrole