PMID: 7523070Jun 1, 1994Paper

Glutathione-dependent defense in channel catfish (Ictalurus punctatus) and brown bullhead (Ameriurus nebulosus)

Ecotoxicology and Environmental Safety
B M HasspielerR T Di Giulio

Abstract

Glutathione-dependent defense against xenobiotic toxicity is a multifaceted phenomenon that has been well characterized in mammals. This study undertakes a comparison of two benthic fish species, the channel catfish and brown bullhead, in terms of characteristics of the glutathione system. The channel catfish, a species that has seldom been observed to express pollutant-mediated neoplasia in field studies, was observed to have significantly higher constitutive levels of hepatic total glutathione and reduced glutatione (GSH). Brown bullhead, a species that is often observed to express neoplasia in contaminated systems, had significantly higher hepatic levels of glutathione disulfide. Furthermore, catfish expressed higher levels of activity of the enzymes gamma-glutamylcysteine synthetase (GCS), glutathione reductase (GR), and glutathione S-transferase, whereas bullhead expressed higher hepatic glutathione peroxidase (GPOX) activity. Both species responded to treatment with the redox active quinone, menadione, by expressing elevated hepatic content of total glutathione. However, the induction response was more rapid and more extensive in catfish compared to that in bullhead. This is attributable to the observed interspecific diff...Continue Reading

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