Please use this identifier to cite or link to this item:
Title: Oxidative attack during temperature fluctuation challenge compromises liver protein homeostasis of a temperate fish model
Author: Sánchez Nuño, Sergio
Sanahuja Piera, Ignasi
Fernández-Alacid, Laura
Ordóñez-Grande, Borja
Carbonell i Camós, Teresa
Ibarz i Valls, Antoni
Keywords: Peixos marins
Marine fishes
Issue Date: 4-Jul-2019
Publisher: Elsevier Ltd
Abstract: Seasonal variations in water temperature are a natural stressor of temperate fish that affect growth performance and metabolism globally. Gilthead sea bream is one of the most economically interesting species in the Mediterranean; but its liver metabolism is affected by the cold season. However, the effects of cold on protein turnover mechanisms have hardly been studied. Here, we study the relationship between liver oxidative status and protein homeostasis pathways during a 50-day low temperature period at 14 °C, and subsequent recovery at two times: 7 days (early recovery) and 30 days (late recovery). Liver redox status was determined by measuring oxidised lipids and proteins, the glutathione redox cycle and major antioxidant enzymes activities. Protein turnover was analysed via liver protein expression of HSP70 and HSP90; proteasome 26S subunits and polyubiquitination, as markers of the ubiquitin-proteasome system (UPS); and cathepsin D, as a lysosomal protease. Low temperature exposure depressed antioxidant enzyme activities, affecting the glutathione redox cycle and reducing total glutathione levels. Both the UPS and lysosomal pathways were also depressed and consequently, oxidised protein accumulated in liver. Interestingly, both protein oxidation and polyubiquitination tagging depended on protein molecular weight. Despite all these alterations, temperature recovery reverted most consequences of the cold at different rates: with delayed recovery of total glutathione levels and oxidised protein degradation with respect to enzyme activities recovery. All these findings demonstrate that protein liver homeostasis is compromised after chronic cold exposure and could be the cause of liver affectations reported in aquaculture of temperate fish.
Note: Versió postprint del document publicat a:
It is part of: Comparative Biochemistry and Physiology B-Biochemistry & Molecular Biology, 2019, vol. 236, p. 110311
Related resource:
ISSN: 1096-4959
Appears in Collections:Articles publicats en revistes (Biologia Cel·lular, Fisiologia i Immunologia)

Files in This Item:
File Description SizeFormat 
691598.pdf2.78 MBAdobe PDFView/Open

This item is licensed under a Creative Commons License Creative Commons