Adaptive alterations on gill Na+, K+-ATPase activity and mitochondrion-rich cells of juvenile Acipenser sinensis acclimated to brackish water

文献类型: 外文期刊

第一作者: Zhao, Feng

作者: Zhao, Feng;Wu, Beibei;Yang, Gang;Zhang, Tao;Zhuang, Ping

作者机构:

关键词: Acipenser sinensis;Na+;K+-ATPase;Mitochondria-rich cell;Osmoregulation;The Yangtze Estuary

期刊名称:FISH PHYSIOLOGY AND BIOCHEMISTRY ( 影响因子:2.794; 五年影响因子:2.876 )

ISSN:

年卷期:

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收录情况: SCI

摘要: Understanding the physiological changes and osmoregulatory strategy is critical for anadromous species to adapt to large changes between freshwater and marine environments. In this study, juvenile Chinese sturgeon (Acipenser sinensis) were acclimated for 2 months to freshwater (FW, c. 0 aEuro degrees) and brackish water (BW, 15 aEuro degrees). Blood was assessed for changes in osmolality and ions. Gill tissue was assayed for Na+, K+-ATPase (NKA) activity and immunohistochemical analysis on mitochondria-rich cells (MRCs). Serum osmolality and ions concentrations (Na+, Cl- and K+) examined, except K+, increased significantly in those specimens adapted to BW. However, the variations were within the range of effective hyperosmotic adaptation. The specific activity of gill NKA of juveniles adapted to BW was significantly higher (c. 1.6 times) than that of fish adapted to FW. MRCs were mainly presented in the interlamellar region of the filament and at the base of the lamella in either FW- or BW-acclimated individuals. In BW, the number and size of MRCs on filaments greatly increased. However, there was no significant difference in the number and size of the MRCs at the lamella region. Results show that juvenile Chinese sturgeon keep osmotic homeostasis in hyperosmotic environments by increasing gill NKA activity and MRCs' size and number, which is similar to other sturgeons and euryhaline teleosts.

分类号: S9

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