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首页> 外文期刊>Polar biology >Antioxidant potential is positively correlated with mitochondrial enzyme activity in Antarctic and non-Antarctic notothenioid fishes
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Antioxidant potential is positively correlated with mitochondrial enzyme activity in Antarctic and non-Antarctic notothenioid fishes

机译：南极和非南极类胡萝卜素鱼类的抗氧化潜力与线粒体酶活性呈正相关

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摘要

Antarctic notothenioid fishes possess high oxidative capacities, large amounts of intracellular lipid combined with biological membranes enriched in polyun-saturated fatty acids, all of which could make these animals susceptible to oxidative injury, particularly in the form of lipid peroxidation. The central objective in this study was to examine capacities for oxidative metabolism and total antioxidant defense in Antarctic and non-Antarctic notothe-nioids in order to test the hypothesis that the cold-bodied Antarctic fishes possess elevated activities of citrate syn-thase (CS), matched by a more robust antioxidant (AOX) defense, than non-Antarctic species. CS activities and total AOX capacities were measured in brain and heart of 4 Antarctic species and 2 non-Antarctic species collected on the 2004 ICEFISH cruise. While no statistical differences are found among Antarctic and non-Antarctic fishes in either CS or AOX capacities, AOX capacity in both tissues expands with CS activity among individuals measured when all species are combined. There is also a 4.5-fold greater AOX capacity, when normalized to CS activity, in brain than in heart indicating the requirement for extra AOX defense in a tissue well known for its particularly high levels of phospholipids more prone to lipid peroxidation.
机译：南极类胡萝卜素鱼类具有很高的氧化能力，大量的细胞内脂质以及富含多不饱和脂肪酸的生物膜，所有这些都可能使这些动物容易受到氧化损伤，特别是脂质过氧化形式。这项研究的主要目的是检验南极和非南极人类拟南体的氧化代谢能力和总抗氧化剂防御能力，以检验冷身南极鱼类柠檬酸合酶（CS）活性升高的假说。 ，与非南极物种相比，具有更强大的抗氧化剂（AOX）防御能力。在2004年ICEFISH航行中，对4种南极物种和2种非南极物种的大脑和心脏的CS活性和总AOX能力进行了测量。虽然在南极和非南极鱼类之间在CS或AOX能力方面均未发现统计学差异，但在将所有物种合并后，两个组织的AOX能力随CS活性而扩展。当相对于CS活性进行标准化时，大脑中的AOX容量要比心脏中的AOX容量大4.5倍，这表明在组织中需要额外的AOX防御作用，该组织以其特别高的磷脂含量而更容易发生脂质过氧化作用。

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