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Energy stores, lipid mobilization and leptin endocrinology of rainbow trout

Journal article
Authors Marcus Johansson
Daniel Morgenroth
Ingibjörg Einarsdottir
Ningping Gong
Björn Thrandur Björnsson
Published in Journal of Comparative Physiology B-Biochemical Systemic and Environmental Physiology
Volume 186
Issue 6
Pages 759-773
ISSN 0174-1578
Publication year 2016
Published at Department of Biological and Environmental Sciences
Pages 759-773
Language en
Keywords Leptin, Leptin receptor, Leptin-binding proteins, Energy balance, Adiposity, Salmonid fish, muscle fat-content, salmo-salar l., goldfish carassius-auratus, anadromous arctic charr, farmed atlantic salmon, central-nervous-system, obese gene-product, oncorhynchus-mykiss, plasma leptin, food-intake, Physiology, Zoology
Subject categories Earth and Related Environmental Sciences, Biological Sciences


The physiological role of leptin in fish is not fully elucidated. In the present study, the involvement of the leptin system in lipid deposition and mobilization in rainbow trout during feeding and 1, 2 and 4 weeks of fasting was investigated in two lines of rainbow trout with different muscle and visceral adiposity: a fat line (FL) with high total energy reserves, high muscle adiposity, but low visceral adiposity and a lean line (LL) with lower total energy reserves and lower muscle adiposity, but higher visceral adiposity. During 4 weeks of fasting, muscle lipids decreased by 63 % in the FL fish, while no such energy mobilization from muscle occurred in the LL fish. On the other hand, lipid stores in liver and visceral adipose tissue was utilized to a similar extent by the two fish lines during fasting. Under normal feeding conditions, plasma leptin levels were higher in the LL than the FL fish, suggesting a possible contribution of visceral adipocytes to plasma leptin levels. Plasma leptin-binding protein levels did not differ between the lines and were not affected by fasting. After 4 weeks of fasting, the long leptin receptor and the leptin-binding protein isoforms 1 and 3 muscle expression increased in the LL fish, as well as hepatic expression of leptin A1 and the two binding protein isoforms. These responses were not seen in the FL fish. The data suggest that the Lep system in rainbow trout is involved in regulation of energy stores and their mobilization.

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