Rh proteins and H plus transporters involved in ammonia excretion in Amur Ide (Leuciscus waleckii) under high alkali exposure

文献类型： 外文期刊

第一作者： Zhao, Xue Fei

作者： Zhao, Xue Fei;Huang, Jing;Li, Wen;Wang, Shuang Yi;Liang, Li Qun;Zhang, Li Min;Chang, Yu Mei;Zhao, Xue Fei;Li, Wen;Wang, Shuang Yi;Liew, Hon Jung

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关键词： Ammonia excretion; Alkali tolerant fish; Alkalinity; Ammonia transporters; Acid transporters

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.8； 五年影响因子：6.9 ）

ISSN： 0147-6513

年卷期： 2024 年 273 卷

页码：

收录情况： SCI

摘要： High alkaline environment can lead to respiratory alkalosis and ammonia toxification to freshwater fish. However, the Amur ide (Leuciscus waleckii), which inhabits an extremely alkaline lake in China with titratable alkalinity up to 53.57 mM (pH 9.6) has developed special physiological and molecular mechanisms to adapt to such an environment. Nevertheless, how the Amur ide can maintain acid-base balance and perform ammonia detoxification effectively remains unclear. Therefore, this study was designed to study the ammonia excretion rate (Tamm), total nitrogen accumulation in blood and tissues, including identification, expression, and localization of ammonia-related transporters in gills of both the alkali and freshwater forms of the Amur ide. The results showed that the freshwater form Amur ide does not have a perfect ammonia excretion mechanism exposed to high-alkaline condition. Nevertheless, the alkali form of Amur ide was able to excrete ammonia better than freshwater from Amur ide, which was facilitated by the ionocytes transporters (Rhbg, Rhcg1, Na+/H+ exchanger 2 (NHE2), and V-type H+ ATPase (VHA)) in the gills. Converting ammonia into urea served as an ammonia detoxication strategy to reduced endogenous ammonia accumulation under high-alkaline environment.

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