Our findings reveal that fT3 levels partially modulate pituitary expression of tshb, its fine regulation is dependent on the total amount of T3 and/or T4 in plasma
2016
Characterization of the peripheral thyroid system of gilthead seabream acclimated to different ambient salinities
Key concepts
Scholarcy highlights
- Thyroid hormones are truly pleiotropic in fish, affecting metabolism, reproduction, growth and osmoregulation, relevant physiological processes for aquaculture
- No mortality was recorded during the experimental period
- The full-length sequence of S. aurata tshb consisted of 870 bp and had an open reading frame of 438 nucleotides that encoded a 146 aa protein
- Multiple sequence alignment of Tshb from seabream and a wide selection of vertebrates revealed they shared from 39% aa sequence conservation with mammals and reptiles up to 92% aa sequence conservation with Perciformes
- We provide some correlations between plasma fT4 concentrations and expression of dio2 in both gills and kidney, indicating an enhancement in peripheral Outer ring deiodination activity when circulating T4 levels increase
- Environmental salinity modulated ORD activity in osmoregulatory tissues such as the gills and kidney supporting the idea that the thyroid system is involved in osmoregulation in fish
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