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首页> 外文期刊>Fish Physiology and Biochemistry >Effect of long-term thermal challenge on the Antarctic notothenioid Notothenia rossii
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Effect of long-term thermal challenge on the Antarctic notothenioid Notothenia rossii

机译:长期热挑战对南极通知Nothothiaid的影响Notholia rossii

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The thermal stability of the Antarctic Ocean raises questions concerning the metabolic plasticity of Antarctic notothenioids to changes in the environmental temperature. In this study, Notothenia rossii survived 90 days at 8 degrees C, and their condition factor level was maintained. However, their hepatosomatic (0.29x) index decreased, indicating a decrease in nutrient storage as a result of changes in the energy demands to support survival. At 8 degrees C, the plasma calcium, magnesium, cholesterol, and triglyceride concentrations decreased, whereas the glucose (1.91x) and albumin (1.26x) concentrations increased. The main energy substrate of the fish changed from lipids to glucose due to a marked increase in lactate dehydrogenase activity, as demonstrated by an increase in anaerobic metabolism. Moreover, malate dehydrogenase activity increased in all tissues, suggesting that fish acclimated at 8 degrees C exhibit enhanced gluconeogenesis. The aerobic demand increased only in the liver due to an increase (2.23x) in citrate synthase activity. Decreases in the activities of superoxide dismutase, catalase, and glutathione-Stransferase to levels that are most likely sufficient at 8 degrees C were observed, establishing a new physiological activity range for antioxidant defense. Our findings indicate that N. rossii has some compensatory mechanisms that enabled its long-term survival at 8 degrees C.
机译:南极海洋的热稳定性提高了关于南极通知的代谢可塑性对环境温度变化的问题。在这项研究中,NotoThia rossii在8℃下90天存活,并保持其条件因子水平。然而,它们的肝脏(0.29倍)指数降低,表明由于能源需求的变化来支持存活的结果,营养存放减少。在8摄氏度下,血浆钙,镁,胆固醇和甘油三酯浓度降低,而葡萄糖(1.91x)和白蛋白(1.26x)浓度增加。由于乳酸脱氢酶活性的显着增加,鱼的主要能量基板从脂质转化为葡萄糖,所以通过增加厌氧代谢的增加。此外,母体脱氢酶活性在所有组织中增加,表明在8摄氏度下驯化的鱼类表现出增强的葡糖生成。由于柠檬酸盐合酶活性的增加(2.23倍),肝脏需求仅增加了肝脏。观察到超氧化物歧化酶,过氧化氢酶和谷胱甘肽 - 溶剂酶的活性降低至最有可能在8摄氏度下足够足够的水平,建立抗氧化防御的新生理活性范围。我们的研究结果表明,N.Rossii具有一些补偿机制,使其在8℃下的长期存活。

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