Adaptation of the sea-bass (Dicentrarchus Labrax) to fresh water: Role of aquaporins and Na+/K+-ATPases

Type Article
Date 2008-07
Language English
Author(s) Giffard Mena I1, Lorin Nebel C2, Charmantier G1, Castille R1, Boulo VivianeORCID3
Affiliation(s) 1 : IFREMER, Univ Montpellier 2, UMR5119-UM2-CNRS-IFREMER, Ecolag, RIAE Team, F-34095 Montpellier 05, France.
2 : Vanderbilt Univ, Med Ctr, Dept Anesthesiol, Nashville, TN 37232 USA.
3 : Univ Montpellier 2, IFREMER, CNRS, UMR UM2 5119,RIAE Team, F-34095 Montpellier 05, France.
Source Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology (1095-6433) (Elsevier), 2008-07 , Vol. 150 , N. 3 , P. 332-338
DOI 10.1016/j.cbpa.2008.04.004
WOS© Times Cited 39
Keyword(s) Salinity adaptation, Juvenile sea bass, Differential mortality, Alpha 4 Na+/K+ ATPase, Alpha l Na+/K+ ATPase, AQP3, AQP1
Abstract Sea-bass (Dicentrarchus labrax) grow under different salinity regimes, from the open sea to lagoons and even rivers, but some mortality has been recorded in juvenile stages when exposed to low salinity water. Changes in water permeability of different osmoregulatory tissues could be the cause of reduction in blood osmotic pressure and death in some fish in fresh water (FW). In order to explore this condition, we have studied the changes of aquaporins (AQP1 and AQP3), alpha 1 and alpha 4 Na+/K(+-)ATPase transcript levels in the digestive tract, kidney and gills after a long-term exposure of juvenile sea-bass to sea water (SW) and FW fish able to survive in SW and FW are called SW-adapted fish (SWS), FW successfully-adapted fish (FWS) respectively, while fish that die in FW are called FW unsuccessfully-adapted fish (FWU). AQP1 was highly expressed in SWS digestive tract and kidney, suggesting its involvement in water absorption. In FWU, AQP1 transcript levels in the digestive tract were higher than in FWS, suggesting higher water absorption. AQP3 transcript levels in gills were higher in FWS compared to SWS, suggesting a role in FW adaptation. AQP3 transcript levels in gills were higher in FWU than in FWS, suggesting an increase in gill water permeability or other solutes. Transfer to FW was followed in gills by an increase in alpha 1 and alpha 4 Na+/K+-ATPase levels in FWS and FWU, supporting the current model of ion absorption through the gills. (C) 2008 Elsevier Inc. All rights reserved.
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Giffard Mena I, Lorin Nebel C, Charmantier G, Castille R, Boulo Viviane (2008). Adaptation of the sea-bass (Dicentrarchus Labrax) to fresh water: Role of aquaporins and Na+/K+-ATPases. Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 150(3), 332-338. Publisher's official version : https://doi.org/10.1016/j.cbpa.2008.04.004 , Open Access version : https://archimer.ifremer.fr/doc/00000/4656/