Changes of physiological rhythms of N-methyl-d-aspartate receptors in the chum salmon Oncorhynchus keta: effect of seawater acclimation during the parr-smolt transformation |
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Authors: | Young Jae Choi Na Na Kim Young-Ung Choi |
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Institution: | 1. Division of Marine BioScience, Korea Maritime and Ocean University, Busan, Republic of Korea;2. Biological Oceanography &3. Marine Biology Division, Korea Institute of Ocean Science &4. Technology, Ansan, Republic of Korea |
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Abstract: | We examined changes on N-methyl-d-aspartate receptors (NRs) in different growth stages (early parr, parr, and early smolt) of chum salmon, Oncorhynchus keta, during parr-smolt transformation from freshwater to seawater. Expression levels of NR genes mRNA and concentration of cortisol, T3, T4, dopamine and Na+/K+-ATPase activity significantly increased at salinity change condition. Moreover, in cultured brain cells, NRs were significantly lower in all groups treated with MK-801 (an antagonist of NRs) than in the early parr stage group in the FW treatment. We confirmed that the reduction in mRNA expression levels of NRs increased from the early parr to the early smolt stage. The information reported here should be taken into account in future studies on the relationship between memory factors of natal streams and homing mechanisms in Salmonidae. |
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Keywords: | chum salmon d-aspartate receptors" target="_blank">N-methyl-d-aspartate receptors NR antagonist parr-smolt transformation physiological rhythm seawater acclimation |
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