title: Hepatic oxidative stress and metal subcellular partitioning are affected by selenium exposure in wild yellow perch (Perca flavescens).
abstract: Yellow perch (Perca flavescens) collected from 11 lakes in the Canadian mining regions of Sudbury (Ontario) and Rouyn-Noranda (Quebec) display wide ranges in the concentrations of cadmium (Cd), nickel (Ni), selenium (Se), and thallium (Tl) in their livers. To determine if these trace elements, as well as copper (Cu) and zinc (Zn), are causing oxidative stress in these fish, we measured three biochemical indicators (glutathione (GSH), glutathione disulfide (GSSG) and thiobarbituric acid-reactive substances (TBARS)) in their livers. We observed that 44% of the yellow perch that we collected were at risk of cellular oxidative stress and lipid peroxidation. Considering all fish from all lakes, higher liver Se concentrations were coincident with both lower proportions of GSSG compared to GSH and lower concentrations of TBARS, suggesting that the essential trace-element Se acts as an antioxidant. Furthermore, fish suffering oxidative stress had higher proportions of Cd, Cu and Zn in potentially sensitive subcellular fractions (organelles and heat-denatured proteins) than did fish not suffering from stress. This result suggests that reactive oxygen species may oxidize metal-binding proteins and thereby reduce the capacity of fish to safely bind trace metals. High Cd concentrations in metal-sensitive subcellular fractions likely further exacerbate the negative effects of lower Se exposure.
authors.affiliation: Institut national de la recherche scientifique, Centre - Eau Terre Environnement (INRS-ETE), Université du Québec, 490 rue de la Couronne, Quebec City, G1K 9A9, QC, Canada. Electronic address: dponton@usgs.gov.
authors.forename: Dominic E
authors.initials: DE
authors.lastname: Ponton
authors.affiliation: Institut national de la recherche scientifique, Centre - Eau Terre Environnement (INRS-ETE), Université du Québec, 490 rue de la Couronne, Quebec City, G1K 9A9, QC, Canada.
authors.forename: Antoine
authors.initials: A
authors.lastname: Caron
authors.affiliation: Institut national de la recherche scientifique, Centre - Eau Terre Environnement (INRS-ETE), Université du Québec, 490 rue de la Couronne, Quebec City, G1K 9A9, QC, Canada.
authors.forename: Landis
authors.initials: L
authors.lastname: Hare
authors.affiliation: Institut national de la recherche scientifique, Centre - Eau Terre Environnement (INRS-ETE), Université du Québec, 490 rue de la Couronne, Quebec City, G1K 9A9, QC, Canada.
authors.forename: Peter G C
authors.initials: PGC
authors.lastname: Campbell
mesh_terms: D000818:Animals; D002104:Cadmium / Q000378:metabolism; D002170:Canada; D003300:Copper / Q000378:metabolism; D004784:Environmental Monitoring; D005978:Glutathione / Q000378:metabolism; D019803:Glutathione Disulfide / Q000378:metabolism; D060106:Lakes / Q000737:chemistry; D015227:Lipid Peroxidation; D008099:Liver / Q000378:metabolism*; D008660:Metabolism / Q000187:drug effects; D009532:Nickel / Q000378:metabolism; D018384:Oxidative Stress; D010471:Perches / Q000378:metabolism*; D017382:Reactive Oxygen Species / Q000378:metabolism; D012643:Selenium / Q000032:analysis / Q000378:metabolism / Q000633:toxicity*; D013858:Thiobarbiturates / Q000378:metabolism; D015032:Zinc / Q000378:metabolism
chemical_list: D017382:Reactive Oxygen Species; D013858:Thiobarbiturates; D002104:Cadmium; D003300:Copper; D009532:Nickel; D005978:Glutathione; D012643:Selenium; D015032:Zinc; C029684:thiobarbituric acid; D019803:Glutathione Disulfide
keywords: Cadmium; Glutathione; Malondialdehyde; Oxidative stress; Selenium; Subcellular partitioning