Rearing temperature enhances hepatic glucokinase but not glucose-6-phosphataseactivities in European sea bass (Dicentrarchus labrax) and gilthead sea bream (Sparus aurata) juveniles fed with the same level of glucose

• Type: Article in International Scientific Journal
• Date: 2008

Authors

Enes, P (Author) FCUP; Panserat, S (Author) Other; Kaushik, S (Author) Other; Oliva Teles, A (Author) FCUP

Journal

Title: Comparative biochemistry and physiology. Part A, Molecular & integrative physiology

Vol. 150

Pages: 355-358

ISSN: 1095-6433

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 26 Citations

Scopus - 26 Citations

Scientific classification

FOS: Medical and Health sciences > Basic medicine

Other information

Authenticus ID: P-003-XY3

DOI: 10.1016/j.cbpa.2008.04.596

Abstract (EN): The aim of this work was to elucidate if the previous results observed in hepatic glucokinase (GK) and glucose-6-phosphatase (G6PaSe) activities in European sea bass and gilthead sea bream are due to temperature per se or to differences in feed intake at different water temperatures. For that purpose triplicate groups of fish (30 g initial body weight) were kept at 18 degrees C or 25 degrees C during two weeks and fed a fixed daily ration of a glucose-free or 20% glucose diet. At the end of the experimental period, plasma glucose levels in both species were not influenced by water temperature but were higher in fish fed the glucose diet. Higher hepatic GK activity was observed in the two fish species fed the glucose diet than the glucose-free diet. In the glucose fed groups, GK activity was higher at 25 degrees C than at 18 degrees C. Glucose-6-phosphatase activities in both species were not influenced by water temperature. In European sea bass and in contrast to gilthead sea bream it was observed an effect of dietary composition on G6Pase activities with surprising higher activities recorded in fish fed the glucose diet than in fish fed the glucose-free diet. Overall, our data strongly suggest that European sea bass and gilthead sea bream are apparently capable to strongly regulate glucose uptake by the liver but not glucose synthesis, which is even enhanced by dietary glucose in European sea bass. Within limits, increasing water temperature enhances liver GK but not G6Pase activities, suggesting that both species are more able to use dietary carbohydrates at higher rearing temperatures.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4