AI Article Synopsis
- Euryhaline fish can adapt to changes in salinity by regulating water and mineral balance through a process called osmoregulation.
- Researchers isolated and sequenced cDNA from sea-bass, identifying aquaporin proteins AQP1 and AQP3, which show significant similarity to mammalian versions.
- Salinity levels affect the expression of these aquaporins in key organs like the gill, kidney, and digestive tract, suggesting that AQP1 mainly helps with water transport in saltwater fish, while AQP3 is likely important for freshwater fish.
Article Abstract
Euryhaline fish possess the ability to compensate for environmental salinity changes through hydro-mineral regulation. A number of proteins have been studied in order to understand water and ion exchanges, known as fish osmoregulation. Sea-bass (Dicentrarchus labrax) cDNA sequences encoding a homologue of mammalian aquaporin (termed AQP1) and a homologue of mammalian aquaglyceroporin (termed AQP3) have been isolated and sequenced. The aquaporin amino acid sequences share respectively more than 60% and 65% identity with other known aquaporins. We have shown that salinity influences aquaporin expression levels in the gill, kidney and digestive tract, the main osmoregulatory organs. AQP1 may have a major osmoregulatory role in water transport in kidney and gut in SW-acclimated fish, whereas AQP3 could be implicated in gill water transport in FW-acclimated fish.
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| http://dx.doi.org/10.1016/j.cbpa.2007.06.002 | DOI Listing |
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