Characterization and expression of Na+/K+-ATPase in gills and kidneys of the Teleost fish Oreochromis mossambicus, Oreochromis urolepis hornorurn and their hybrids in response to salinity challenge

文献类型： 外文期刊

第一作者： Zhu, Huaping

作者： Zhu, Huaping;Liu, Zhigang;Gao, Fengying;Lu, Maixin;Liu, Yujiao;Su, Huanhuan;Ma, Dongmei;Ke, Xiaoli;Wang, Miao;Cao, Jianmeng;Yi, Mengmeng

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关键词： Na+/K+-ATPase; Salinities tolerance; Tilapia; Gene expression; Osmoregulation

期刊名称：COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY （ 影响因子：2.32； 五年影响因子：2.465 ）

ISSN： 1095-6433

年卷期： 2018 年 224 卷

页码：

收录情况： SCI

摘要： Tilapia (Oreochromis mossambicus, O. urolepis homonym their hybrids O. mossambicus female x O. hornorum male and O. hornorum female x O. mossambicus male) were exposed to a high salinity environment to evaluate their osmoregulatory responses. The plasma osmolality of all the tilapia species were elevated with the salinity challenge. The activities of Na+/K+-ATPase (NKA) in both the gill and kidney showed a similar increased change tendency compared with the control. The distribution of NKA alpha 1 mRNA in all the examined tissues suggested that NKA al has a possible housekeeping role for this isoform. The amount of NKA al mRNA in the gill and kidney was elevated in the four fishes with similar expression patterns after transfer from freshwater to seawater. The NKA alpha 1 mRNA expression levels in the gill reached their peak level at 24 h after transfer (P < 0.01) compared to the freshwater group, following decreases in the pretreatment level at 48 h (P > 0.05). However, the NKAa1 mRNA expression levels in the kidney were not significantly affected with increasing environmental salinity (P > 0.05). The differences in the responses to saltwater challenge may be associated with differences in saltwater tolerance between the four tilapia. The drastic increase in the plasma osmolality, NKA activities and mRNA expression suggested that the hybrids (O. mossambicus female x O. hornorum male) possess heterosis in salinity responsiveness compared to that of both the parents, indicating a maternal effect on the salinity tolerance of the tilapia hybrids. This study provides a theoretical basis to further study the mechanism of fish osmoregulation response to salinity challenge.

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