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Seasonal appetite regulation in the anadromous Arctic charr: Evidence for a role of adiposity in the regulation of appetite but not for leptin in signalling adiposity

Journal article
Authors E. Froiland
M. Jobling
Björn Thrandur Björnsson
Peter Kling
C. S. Ravuri
E. H. Jorgensen
Published in General and Comparative Endocrinology
Volume 178
Issue 2
Pages 330-337
ISSN 0016-6480
Publication year 2012
Published at Department of Biological and Environmental Sciences
Pages 330-337
Language en
Links dx.doi.org/10.1016/j.ygcen.2012.06....
Keywords Salmonids, Fasting, Adipokines, Leptin, Body fat, Seasonality, salmon salmo-salar, atlantic salmon, food-intake, salvelinus-alpinus, gene-expression, feeding regime, rainbow-trout, lipostatic regulation, compensatory growth, receptor expression
Subject categories Biological Sciences

Abstract

The aim of this study was to investigate whether the seasonal feeding cycle of the anadromous Arctic charr (Salvelinus alpinus) is regulated by a lipostatic mechanism and if leptin (Lep) might act as an endocrine signal of adiposity. Offspring of anadromous Arctic charr with a body mass of 121 g were divided into two treatment groups; one was given feed in excess from March to November. and the other was fasted between April and early June and fed in excess thereafter. In the continuously fed group there was an 8-fold increase in body mass, and a doubling of percentage body fat, from March to August, after which there was no further increase. Fish in the other group lost weight and body fat during fasting, but grew rapidly on being fed, and had partially compensated for their deficit in body mass by August. Differences in percentage body fat between treatment groups were eliminated by August. providing evidence for a lipostatic regulation of feeding and energy homeostasis in Arctic charr. Neither liver total LepA gene expression nor plasma Lep concentrations correlated positively with fish adiposity, so there was no evidence that Lep acts as a signal of adiposity in this species. On the other hand, there was a strong increase in liver LepA1 gene expression at the end of the fasting period, concomitant with fat mobilization and increased plasma glucose, indicating that LepA1 may play a role in regulating metabolic processes associated with fasting. (C) 2012 Elsevier Inc. All rights reserved.

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