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Modulation of branchial ion transport protein expression by salinity in glass eels (Anguilla anguilla L.)
Wilson, J.M.; Leitao, A.; Goncalves, A.F.; Ferreira, C.; Reis-Santos, P.; Fonseca, A.-V.; da Silva, J.M.; Antunes, J.C.; Pereira-Wilson, C.; Coimbra, J. (2007). Modulation of branchial ion transport protein expression by salinity in glass eels (Anguilla anguilla L.). Mar. Biol. (Berl.) 151(5): 1633-1645. http://dx.doi.org/10.1007/s00227-006-0579-7
In: Marine Biology: International Journal on Life in Oceans and Coastal Waters. Springer: Heidelberg; Berlin. ISSN 0025-3162; e-ISSN 1432-1793
|  |
| Auteurs | | Top |
- Wilson, J.M.
- Leitao, A.
- Goncalves, A.F.
- Ferreira, C.
|
- Reis-Santos, P.
- Fonseca, A.-V.
- da Silva, J.M.
|
- Antunes, J.C.
- Pereira-Wilson, C.
- Coimbra, J.
|
| Abstract |
The Anguillid juvenile glass eel must deal with the osmoregulatory consequences of highly variable environmental salinities on its recruitment migration from coastal to fresh waters. Changes in ionoregulatory parameters and branchial ion transport protein [Na+/K+-ATPase, Na+:K+:2Cl- cotransporter (NKCC), cystic fibrosis transmembrane regulator (CFTR) anion channel, V-type proton ATPase] expression (activities, protein and/or mRNA level expression and/or cellular localization) in response to acclimation to a broad range of ionic strengths [distilled water (DW) to hypersaline water (HSW; 150%) sea water (SW 32‰)] was studied. The estuarine glass eels were very euryhaline and successfully acclimated to acute changes in environmental ionic strength from 50% SW, with high mortality only observed in HSW (51%) and sublethal osmoregulatory indicators (whole body water content and sodium levels) disturbed at the extremes (DW and HSW). Central to a high salinity acclimation were elevated branchial Na+/K+-ATPase, NKCC and CFTR expression. At lower salinity, Na+/K+-ATPase expression was maintained and NKCC and CFTR expressions were reduced. Branchial chloride cells increased in size up to SW but decreased in HSW. During hypotonic disturbance (DW), no compensatory elevation in V-ATPase or Na+/K+-ATPase expression was observed. |
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