Hypoxic acclimation improves mitochondrial bioenergetic function in large yellow croaker Larimichthys crocea under Cu stress

文献类型： 外文期刊

第一作者： Zeng, Lin

作者： Zeng, Lin;Li, Wen-Cheng;Zhang, Hui;Song, Wei;Cao, Ping;Song, Wei;Ai, Chun-Xiang;Hu, Bing

作者机构：

关键词： Hypoxic acclimation; Mitochondria; Oxidative phosphorylation; Cu exposure

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.291； 五年影响因子：6.393 ）

ISSN： 0147-6513

年卷期： 2021 年 224 卷

页码：

收录情况： SCI

摘要： The purpose of this study was to investigate how pre-hypoxia exposure affected the mitochondrial structure and bioenergetic function of large yellow croaker in responding to Cu stress. Fish were acclimated to normoxia and 3.0 mg DO L-1 for 48 h, then subjected to 0 and 120 mu g Cu L-1 for another 48 h. Hypoxic acclimation did not affect mitochondrial ultrastructure and reactive oxygen species (ROS), but reduced oxidative phosphorylation (OXPHOS) efficiency. Cu exposure impaired mitochondrial ultrastructure, increased ROS generation and inhibited OXPHOS efficiency. Compared with Cu exposure alone, hypoxic acclimation plus Cu exposure reduced ROS production and improved OXPHOS efficiency by enhancing mitochondrial respiratory control ratio, mitochondrial membrane potential, and activities and gene expressions of electron transport chain enzymes. In conclusion, hypoxic acclimation improved the mitochondrial energy metabolism of large yellow croaker under Cu stress, facilitating our understanding of the molecular mechanisms regarding adaptive responses of hypoxia-acclimated fish under Cu stress.

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