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dc.contributor.authorRuiz-Jarabo, Ignacioes_ES
dc.contributor.authorKlaren, Peter H. M.es_ES
dc.contributor.authorLouro, Brunoes_ES
dc.contributor.authorMartos-Sitcha, Juan Antonioes_ES
dc.contributor.authorPinto, P. I. S.es_ES
dc.contributor.authorVargas-Chacoff, Luises_ES
dc.contributor.authorFlik, Gertes_ES
dc.contributor.authorMartínez-Rodríguez, Gonzaloes_ES
dc.contributor.authorPower, Deborah M.es_ES
dc.contributor.authorMancera, Juan Migueles_ES
dc.contributor.authorArjona, F. J.es_ES
dc.identifier.citationComparative Biochemistry and Physiology - A - Molecular and Integrative Physiology 203: 24-31 (2017)es_ES
dc.description.abstractThyroid hormones are involved in many developmental and physiological processes, including osmoregulation. The regulation of the thyroid system by environmental salinity in the euryhaline gilthead seabream (Sparus aurata) is still poorly characterized. To this end seabreams were exposed to four different environmental salinities (5, 15, 40 and 55 ppt) for 14 days, and plasma free thyroid hormones (fT3, fT4), outer ring deiodination and Na+/K+-ATPase activities in gills and kidney, as well as other osmoregulatory and metabolic parameters were measured. Low salinity conditions (5 ppt) elicited a significant increase in fT3 (29%) and fT4 (184%) plasma concentrations compared to control animals (acclimated to 40 ppt, natural salinity conditions in the Bay of Cádiz, Spain), while the amount of pituitary thyroid stimulating hormone subunit β (tshb) transcript abundance remained unchanged. In addition, plasma fT4 levels were positively correlated to renal and branchial deiodinase type 2 (dio2) mRNA expression. Gill and kidney T4-outer ring deiodination activities correlated positively with dio2 mRNA expression and the highest values were observed in fish acclimated to low salinities (5 and 15 ppt). The high salinity (55 ppt) exposure caused a significant increase in tshb expression (65%), but deiodinase gene expression (dio1 and dio2) and activity did not change and were similar to controls (40 ppt). In conclusion, acclimation to different salinities led to changes in the peripheral regulation of thyroid hormone metabolism in seabream. Therefore, thyroid hormones are involved in the regulation of ion transport and osmoregulatory physiology in this species. The conclusions derived from this study may also allow aquaculturists to modulate thyroid metabolism in seabream by adjusting culture salinity.es_ES
dc.description.sponsorshipThis work was partially supported by a Socrates/Erasmus Grant from the European Union and a Ph.D. scholarship from the University of Cadiz (UCA 2009-074-FPI) to I. R-J. It has been also supported by grants AGL2007-61211/ACU (Ministerio de Educación y Ciencia and FEDER, Spain) and Proyecto de Excelencia PO7-RNM-02843 (Junta de Andalucía) to J.M.M. BL (SFRH/BPD/89889/2012) and PISP (SFRH/BPD/84033/2012) were supported by the Science Foundation (FCT) of Portugal.es_ES
dc.subjectOuter ring deiodinationes_ES
dc.subjectSparus aurataes_ES
dc.subjectThyroid hormoneses_ES
dc.titleCharacterization of the peripheral thyroid system of gilthead seabream acclimated to different ambient salinitieses_ES
dc.description.peerreviewedPeer reviewedes_ES
dc.contributor.funderEuropean Commissiones_ES
dc.contributor.funderUniversidad de Cádizes_ES
dc.contributor.funderMinisterio de Educación y Ciencia (España)es_ES
dc.contributor.funderJunta de Andalucíaes_ES
dc.contributor.funderFundação para a Ciência e a Tecnologia (Portugal)es_ES
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