Changes in mitochondrial membrane composition and oxidative status during rapid growth,maturation and aging in zebrafish, Danio rerio |
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Authors: | Pedro F Almaida-Pagán Alejandro Lucas-Sánchez Douglas R Tocher |
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Institution: | 1. Institute of Aquaculture, School of Natural Sciences, University of Stirling, Stirling FK9 4LA, Scotland, United Kingdom;2. Department of Physiology, Faculty of Biology, University of Murcia, 30100 Murcia, Spain |
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Abstract: | Considering membranes and membrane components as possible pacemakers of the main processes taking place inside mitochondria, changes in phospholipids or fatty acids could play a central role linking different mechanisms involved in cumulative damage to cell molecules and dysfunction during periods of high stress, such as rapid growth and aging. Changes affecting either lipid class or fatty acid compositions could affect phospholipid and membrane properties and alter mitochondrial function and cell viability. In the present study, mitochondrial oxidative status and mitochondrial membrane phospholipid compositions were analyzed throughout the life-cycle of zebrafish. TBARS content significantly increased in 18-month-old fish while aconitase activity decreased in 24-month-old fish, which have been related with oxidative damage to molecules. Mitochondria-specific superoxide dismutase decreased in 24-month-old animals although this change was not statistically significant. Age affected both mitochondrial phospholipid content and the peroxidation index of most phospholipid classes suggesting that oxidative damage to mitochondrial lipids was occurring. |
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Keywords: | Acn aconitase ARA arachidonic acid BHT butylated hydroxytoluene CL cardiolipin DHA docosahexaenoic acid DMA dimethyl acetal ETC electron transport chain FAME fatty acid methyl esters HP-TLC high performance thin layer chromatography LA linoleic acid LC-PUFA long chain polyunsaturated fatty acid MUFA monounsaturated fatty acids OA oleic acid PC phosphatidylcholine PE phosphatidylethanolamine PI phosphatidylinositol PIn peroxidation index PL phospholipid PS phosphatidylserine PUFA polyunsaturated fatty acid ROS reactive oxygen species SA-β-gal senescence-associated β-galactosidase SFA saturated fatty acids SM sphingomyelin SOD superoxide dismutase TBARS thiobarbituric acid reactive substances TBA thiobarbituric acid TCA trichloroacetic acid TLC thin layer chromatography |
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