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© 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Low temperatures provoke drastic reductions in gilthead sea bream (Sparus aurata) activity and nourishment, leading to growth arrest and a halt in production. However, scarce data exist concerning the implications of central core control during the cold season. The aim of this work was to study the effects of low temperature and recovery from such exposure on the pituitary activity of sea bream juveniles fed 18% or 14% dietary lipid. A controlled indoor trial was performed to simulate natural temperature fluctuation (22 °C to 14 °C to 22 °C). Meanwhile, we determined the regulatory role of the pituitary by analyzing the gene expression of some pituitary hormones and hormone receptors via qPCR, as well as plasma levels of thyroidal hormones. In response to higher dietary lipids, hormone pituitary expressions were up-regulated. Induced low temperatures and lower ingesta modulated pituitary function up-regulating GH and TSH and thyroid and glucocorticoid receptors. All these findings demonstrate the capacity of the pituitary to recognize both external conditions and to modulate its response accordingly. However, growth, peripheral tissues and metabolism were not linked or connected to pituitary function at low temperatures, which opens an interesting field of study to interpret the hypothalamus–pituitary–target axis during temperature fluctuations in fish.

Details

Title
Modulation of Pituitary Response by Dietary Lipids and Throughout a Temperature Fluctuation Challenge in Gilthead Sea Bream
Author
Sánchez-Nuño, Sergio 1   VIAFID ORCID Logo  ; Silva, Sandra C 2 ; Guerreiro, Pedro M 2 ; Ordóñez-Grande, Borja 1 ; Sanahuja, Ignasi 1 ; Fernández-Alacid, Laura 1 ; Ibarz, Antoni 1 

 Department of Cell Biology, Physiology and Immunology, Faculty of Biology, Universitat de Barcelona, Diagonal 643, 08028 Barcelona, Spain; [email protected] (B.O.-G.); [email protected] (I.S.); [email protected] (L.F.-A.) 
 CCMAR—Centre for Marine Sciences, Universidade do Algarve, 8005-139 Faro, Portugal; [email protected] (S.C.S.); [email protected] (P.M.G.) 
First page
55
Publication year
2019
Publication date
2019
Publisher
MDPI AG
e-ISSN
24103888
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2548429992
Copyright
© 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.