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      Ion Transport Signal Pathways Mediated by Neurotransmitter (Biogenic Amines) of Litopenaeus vannamei Under Low Salinity Challenge

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          The Pacific white shrimp, Litopenaeus vannamei, is widely farmed in China. Salinity is a major environmental factor that affects its growth and distribution. Crustacean hyperglycemic hormone is verified to participate in ion transport in response to the salinity challenge mediated by endocrine neurotransmitters (biogenic amines, BAs). In the present study, the contents of BAs and expressions of their receptors were detected in gills of Litopenaeus vannamei exposed to low salinity. The intracellular signaling molecules such as cyclic adenosine monophosphate (cAMP), protein kinase A (PKA), 14-3-3 protein, FXYD2 protein and cAMP response element-binding protein (CREB) were detected. The effects of low salinity on the expressions of Na +-K +-ATPase , Na +/K +/2Cl co-transporter and Cl transporter and activity of Na +-K +-ATPase were also analyzed. The results showed that dopamine and epinephrine concentrations and their receptor expressions were significantly affected by low salinity. The changes of cAMP and PKA were obvious and the expressions of 14-3-3 and FXYD2 peaked at early stages. However, the expression of CREB was only significantly up-regulated on day 9. The activity and expression of Na +-K +-ATPase (α subunit) reached a peak on day 1. The expressions of Na +/K +/2Cl co-transporter and Cl transporter up-regulated obviously. It suggests that BAs can activate the cAMP-PKA pathway, which further acts on the 14-3-3 and FXYD2 proteins, and ultimately improve the activity of Na +-K +-AT- Pase. Furthermore, after BAs stimulate the cAMP-PKA pathway, PKA phosphorylates the transcription factor CREB and regulates the expressions of ion transport enzymes/ transporters. The results in this study are helpful for understanding the response mechanism of endocrine neurotransmitters on osmoregulation in crustaceans.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          10 January 2019
          01 February 2019
          : 18
          : 1
          : 210-218
          1 The Key Laboratory of Mariculture of Ministry of Education, Ocean University of China, Qingdao 266003, China
          Author notes
          *Corresponding author: PAN Luqing
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2019.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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