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Title: Relationship between plasma leptin-like protein levels, begging and provisioning in nestling thin-billed prions Pachyptila belcheri
Authors: Quillfeldt, Petra ×
Everaert, Nadia
Buyse, Johan
Masello, Juan F
Dridi, Sami #
Issue Date: Apr-2009
Publisher: Academic Press
Series Title: General and Comparative Endocrinology vol:161 issue:2 pages:171-178
Abstract: While there have been many studies in various species examining the physiological role of leptin, there are so far no data in free-living seabirds. In the present study, we assess whether leptin is expressed in thin-billed prions (Pachyptila belcheri) and we investigate its relationship with feeding-related parameters including body condition, begging intensities and provisioning rates. We showed by Western Blot analysis using leptin-specific antibody that leptin-like protein (14-16 kDa) is expressed in adipose tissue and liver of nestling thin-billed prions. Plasma leptin-like protein levels, determined by RIA, were in the same range (1-3 ng/ml) as in other avian species and increased with age. In two breeding seasons, the plasma leptin-like protein levels were negatively correlated with provisioning rates (R = -0.67 and -0.35 in 2003 and 2004, respectively, P < 0.05) indicating that endogenous leptin may be an anorexigenic hormone in wild birds. Plasma leptin-like protein levels were positively correlated with begging intensities (R = 0.43 and 0.37 in 2003 and 2004, respectively, P < 0.05), and this may be because hungry nestling seabird chicks with low body conditions increased their begging intensities. Plasma leptin-like protein levels did not correlate either with plasma triglyceride or glucose levels in thin-billed prions. Overall, these findings show the presence of leptin-like protein in free-living seabirds and provide new insights into its function and its possible role in feeding-associated behaviours. (C) 2009 Elsevier Inc. All rights reserved.
URI: 
ISSN: 0016-6480
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division of Livestock-Nutrition-Quality (-)
× corresponding author
# (joint) last author

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