title: Characterization of antioxidant system parameters in four freshwater fish species.
abstract: The potential use of antioxidant system parameters has gained considerable interest due to their pivotal role of detoxification mechanisms in environmental studies and culture fish point of view. Fish with different ecological needs may have different antioxidant capacity and response to environmental contaminants. Thus, the optimal working conditions and specific enzyme activities (Vmax and Km) of antioxidant system parameters (Superoxide dismutase, SOD; Catalase, CAT; Glutathione peroxidase, GPX; Glutathione reductase, GR and Glutathione S-transferase, GST) and glutathione (GSH) were determined in four commonly cultured freshwater fish species (tilapia; Oreochromis niloticus, carp; Cyprinus carpio, trout; Onchorhynchus mykiss and catfish; Clarias garipienus). Data showed that optimal concentrations of different buffers, pH and specific chemicals for each enzyme and GSH were similar in most cases for all fish species, except a few differences. The highest Vmax and Km values were found in carp for GPX and GST, though these values were the highest in tilapia, catfish and trout for CAT, SOD and GR, respectively. As a conclusion, optimization assays of these parameters in different bioindicator organisms based on their physiological and ecological differences may be useful for the aquatic ecosystem biomonitoring studies and also present fundamental data for utilization in aquaculture.
authors.affiliation: Cukurova University Vocational School of Imamoglu, Adana, Turkey. Electronic address: gatli@cu.edu.tr.
authors.forename: Gülüzar
authors.initials: G
authors.lastname: Atli
authors.affiliation: Cukurova University Faculty of Science, Department of Biology, Adana, Turkey.
authors.forename: Esin G
authors.initials: EG
authors.lastname: Canli
authors.affiliation: Cukurova University Faculty of Science, Department of Biology, Adana, Turkey.
authors.forename: Ali
authors.initials: A
authors.lastname: Eroglu
authors.affiliation: Cukurova University Faculty of Science, Department of Biology, Adana, Turkey.
authors.forename: Mustafa
authors.initials: M
authors.lastname: Canli
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000378:metabolism*; D002347:Carps / Q000378:metabolism; D002397:Catfishes / Q000378:metabolism; D004784:Environmental Monitoring / Q000379:methods*; D005399:Fishes / Q000378:metabolism*; D005618:Fresh Water / Q000737:chemistry; D005978:Glutathione / Q000378:metabolism; D005979:Glutathione Peroxidase / Q000378:metabolism; D005980:Glutathione Reductase / Q000378:metabolism; D005982:Glutathione Transferase / Q000378:metabolism; D008099:Liver / Q000201:enzymology*; D018384:Oxidative Stress / Q000502:physiology*; D013482:Superoxide Dismutase / Q000378:metabolism; D017210:Tilapia / Q000378:metabolism; D014337:Trout / Q000378:metabolism
chemical_list: D000975:Antioxidants; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D005980:Glutathione Reductase; D005982:Glutathione Transferase; D005978:Glutathione
keywords: Antioxidant enzymes; Characterization; Freshwater fish; Glutathione