Repository logo
 
Loading...
Thumbnail Image
Publication

Characterization of the peripheral thyroid system of gilthead seabream acclimated to different ambient salinities

Use this identifier to reference this record.
Name:Description:Size:Format: 
Patricia Pinto - 2Ruiz-Jarabo16 CBP.pdf842.3 KBAdobe PDF Download

Advisor(s)

Abstract(s)

Thyroid 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, ff4), 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 ff4 (184%) plasma concentrations compared to control animals (acclimated to 40 ppt, natural salinity conditions in the Bay of Cadiz, Spain), while the amount of pituitary thyroid stimulating hormone subunit 13 (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 (diol 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. (C) 2016 Elsevier Inc. All rights reserved.

Description

Keywords

Bream Sparus-Aurata Sea bream Energy-metabolism Thyrotropin-beta Rainbow-trout Deiodinase Hormones Growth Liver Fish

Citation

Organizational Units

Journal Issue

Publisher

Elsevier

CC License

Altmetrics

Plum Print visual indicator of research metrics
  • Citations
    • Citation Indexes: 17
  • Captures
    • Readers: 39
see details