Mixed‐function oxidase enzyme activity and oxidative stress in lake trout (Salvelinus namaycush) exposed to 3,3′,4,4′,5‐pentachlorobiphenyl (PCB‐126)
Identifieur interne : 001112 ( Main/Exploration ); précédent : 001111; suivant : 001113Mixed‐function oxidase enzyme activity and oxidative stress in lake trout (Salvelinus namaycush) exposed to 3,3′,4,4′,5‐pentachlorobiphenyl (PCB‐126)
Auteurs : Vince P. Palace [Canada] ; Jack F. Klaverkamp [Canada] ; W. Lyle Lockhart [Canada] ; Jack F. Klaverkamp [Canada] ; W. Lyle Lockhart [Canada] ; Don A. Metner [Canada] ; Derek Muir [Canada] ; Scott B. Brown [Canada]Source :
- Environmental Toxicology and Chemistry [ 0730-7268 ] ; 1996-06.
English descriptors
- KwdEn :
Abstract
Juvenile lake trout were intraperitoneally injected with corn oil containing nominal concentrations of 0, 0.6, 6.3, or 25 μg [14C]‐3,3′,4,4′,5‐pentachlorobiphenyl (PCB‐126) per gram of body weight. The PCB‐126 accumulated in liver in a dose‐dependent manner to a sustained concentration by 6 weeks and remained elevated for the 30‐week experimental period. Mixed‐function oxidase (MFO) enzyme activity was elevated in the two highest dose groups relative to the control group, but not in the low‐dose group throughout the 30 weeks. Oxidative stress, measured by the thiobarbituric acid reactive substances test, was correlated with ethoxyresorufin O‐deethylase and was elevated in liver of the two highest PCB dose groups but not the low‐dose group. The activities of the enzymatic antioxidants superoxide dismutase, catalase, and glutathione peroxidase were unaffected by PCB‐126 exposure. The nonenzymatic antioxidant tocopherol was depleted to approximately 75% of the control concentration in liver of all three PCB‐dosed groups. Hepatic ascorbic acid levels were not different in any of the treatment groups. Retinol was depleted by greater than an order of magnitude in liver of the two highest dose groups but not in the low‐dose group. This study demonstrates a correlation between hepatic MFO activity and oxidative stress in PCB‐exposed lake trout. Tocopherol and retinol may be important mediators of oxidative stress but additional study is required to confirm the antioxidant activity of retinol.
Url:
DOI: 10.1002/etc.5620150618
Affiliations:
- Canada
- Manitoba, Ontario
- Burlington (Ontario), Winnipeg
- Centre canadien des eaux intérieures, Université du Manitoba
Links toward previous steps (curation, corpus...)
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- to stream Istex, to step Curation: 000324
- to stream Istex, to step Checkpoint: 000C60
- to stream Main, to step Merge: 001178
- to stream Main, to step Curation: 001112
Le document en format XML
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The PCB‐126 accumulated in liver in a dose‐dependent manner to a sustained concentration by 6 weeks and remained elevated for the 30‐week experimental period. Mixed‐function oxidase (MFO) enzyme activity was elevated in the two highest dose groups relative to the control group, but not in the low‐dose group throughout the 30 weeks. Oxidative stress, measured by the thiobarbituric acid reactive substances test, was correlated with ethoxyresorufin O‐deethylase and was elevated in liver of the two highest PCB dose groups but not the low‐dose group. The activities of the enzymatic antioxidants superoxide dismutase, catalase, and glutathione peroxidase were unaffected by PCB‐126 exposure. The nonenzymatic antioxidant tocopherol was depleted to approximately 75% of the control concentration in liver of all three PCB‐dosed groups. Hepatic ascorbic acid levels were not different in any of the treatment groups. Retinol was depleted by greater than an order of magnitude in liver of the two highest dose groups but not in the low‐dose group. This study demonstrates a correlation between hepatic MFO activity and oxidative stress in PCB‐exposed lake trout. Tocopherol and retinol may be important mediators of oxidative stress but additional study is required to confirm the antioxidant activity of retinol.</div></front></TEI><affiliations><list><country><li>Canada</li></country><region><li>Manitoba</li><li>Ontario</li></region><settlement><li>Burlington (Ontario)</li><li>Winnipeg</li></settlement><orgName><li>Centre canadien des eaux intérieures</li><li>Université du Manitoba</li></orgName></list><tree><country name="Canada"><region name="Manitoba"><name sortKey="Palace, Vince P" sort="Palace, Vince P" uniqKey="Palace V" first="Vince P." last="Palace">Vince P. Palace</name></region><name sortKey="Brown, Scott B" sort="Brown, Scott B" uniqKey="Brown S" first="Scott B." last="Brown">Scott B. Brown</name><name sortKey="Klaverkamp, Jack F" sort="Klaverkamp, Jack F" uniqKey="Klaverkamp J" first="Jack F." last="Klaverkamp">Jack F. Klaverkamp</name><name sortKey="Klaverkamp, Jack F" sort="Klaverkamp, Jack F" uniqKey="Klaverkamp J" first="Jack F." last="Klaverkamp">Jack F. Klaverkamp</name><name sortKey="Lockhart, W Lyle" sort="Lockhart, W Lyle" uniqKey="Lockhart W" first="W. Lyle" last="Lockhart">W. Lyle Lockhart</name><name sortKey="Lockhart, W Lyle" sort="Lockhart, W Lyle" uniqKey="Lockhart W" first="W. Lyle" last="Lockhart">W. Lyle Lockhart</name><name sortKey="Metner, Don A" sort="Metner, Don A" uniqKey="Metner D" first="Don A." last="Metner">Don A. Metner</name><name sortKey="Muir, Derek C G" sort="Muir, Derek C G" uniqKey="Muir D" first="Derek C. G." last="Muir">Derek Muir</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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