Linked Life Data

20086129

Source:http://linkedlifedata.com/resource/pubmed/id/20086129

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pubmed-article:20086129pubmed:abstractTextCold acclimation of ectotherms results typically in enhanced oxidative capacities and lipid remodeling, changes that should increase the risk of lipid peroxidation (LPO). It is unclear whether activities of antioxidant enzymes may respond in a manner to mitigate the increased potential for LPO. The current study addresses these questions using killifish (Fundulus heteroclitus macrolepidotus) and bluegill (Lepomis macrochirus) acclimated to 5 and 25 degrees C for 9 days and 2 months, respectively. Because the effects of temperature acclimation on pro- and antioxidant metabolism may be confounded by variable activity levels among temperature groups, one species (killifish) was also subjected to a 9-day exercise acclimation. Oxidative capacity of glycolytic (skeletal) muscle (indicated by the activity of cytochrome c oxidase) was elevated by 1.5-fold in killifish, following cold acclimation, but was unchanged in cardiac muscle and also unaffected by exercise acclimation in either tissue. No changes in citrate synthase activity were detected in either tissue following temperature acclimation. Enzymatic antioxidants (catalase and superoxide dismutase) of either muscle type were unaltered by temperature or exercise acclimation. Mitochondria from glycolytic muscle of cold-acclimated killifish were enriched in highly oxidizable polyunsaturated fatty acids (PUFA), including diacyl phospholipids (total carbons:total double bonds) 40:8 and 44:12. Increased oxidative capacity, coupled with elevated PUFA content in mitochondria from cold-acclimated animals did not, however, impact LPO susceptibility when measured with C11-BODIPY. The apparent mismatch between oxidative capacity and enzymatic antioxidants following temperature acclimation will be addressed in future studies.lld:pubmed
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pubmed-article:20086129pubmed:authorpubmed-author:GrisJ CJClld:pubmed
pubmed-article:20086129pubmed:authorpubmed-author:CrockettE LELlld:pubmed
pubmed-article:20086129pubmed:authorpubmed-author:MilesD R BDRlld:pubmed
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pubmed-article:20086129pubmed:dateRevised2011-7-22lld:pubmed
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pubmed-article:20086129pubmed:articleTitleTemperature acclimation alters oxidative capacities and composition of membrane lipids without influencing activities of enzymatic antioxidants or susceptibility to lipid peroxidation in fish muscle.lld:pubmed
pubmed-article:20086129pubmed:affiliationDepartment of Biological Science, Irvine Hall, Ohio University, Athens, OH 45701, USA. grimj@ohio.edulld:pubmed
pubmed-article:20086129pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:20086129pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed
pubmed-article:20086129pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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