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- Title
Time‐course changes in the regulation of ions and amino acids in the hard clam Meretrix lusoria upon lower salinity challenge.
- Authors
Lin, Chia‐Hao; Yeh, Po‐Ling; Lee, Tsung‐Han
- Abstract
In this study, we examined ion and amino acid regulation in the gill and mantle of the hard clam Meretrix lusoria. We found that the osmolality and Na+ and Cl‐ concentrations of hard clam hemolymph were significantly reduced after transferring clams from the salinity of their natural habitat [20‰ saltwater (SW)] to a lower salinity environment (10‰ SW). Specific activities of Na+, K+‐ATPase (NKA), which provides the driving force for the secondary ion transport associated with cell osmoregulation in gills and mantles, were unaffected during the acclimation to lower salinity. In contrast, there was a significant decline in the contents of free amino acids (FAAs) in the gills and mantles of hard clams during lower salinity acclimation. Taurine was established to be the dominant FAA, the content of which is considerably higher than that of other FAAs in the hard clam. Following acclimation to the lower salinity environment, mRNA expression of the taurine transporter (TAUT), which plays a pivotal role in regulating intracellular taurine contents, was significantly upregulated in the gill and downregulated in the mantle of hard clams at different time points. However, the relative abundance of TAUT protein in the gill and mantle was significantly increased after transfer from 20‰ SW to 10‰ SW, which may reflect feedback regulation in response to reduced taurine contents in the gill and mantle of hard clams. Collectively, the findings of this study provide important insights on the dynamic processes of ion and amino acid regulation in the peripheral tissues of bivalves. Highlights: Dynamic processes of ion and amino acid regulation in the gill and mantle of hard clams upon low salinity challenge were evaluated.Na+,K+‐ATPase activity in the gill was not in response to low salinity challenge.Taurine transporter mRNA and protein expression in the gill and mantle were differently regulated after transfer to low salinity.
- Subjects
AMINO acids; CLAMS; SALINITY; IONS; CARRIER proteins
- Publication
Journal of Experimental Zoology: Part A Ecological & Integrative Physiology, 2021, Vol 335, Issue 7, p602
- ISSN
2471-5638
- Publication type
Article
- DOI
10.1002/jez.2503