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Obesity in mice with adipocyte-specific deletion of clock component Arntl.

Authors :
Paschos, Georgios K
Ibrahim, Salam
Song, Wen-Liang
Kunieda, Takeshige
Grant, Gregory
Reyes, Teresa M
Bradfield, Christopher A
Vaughan, Cheryl H
Eiden, Michael
Masoodi, Mojgan
Griffin, Julian L
Wang, Fenfen
Lawson, John A
FitzGerald, Garret A
Source :
Nature Medicine; Dec2012, Vol. 18 Issue 12, p1768-1777, 10p
Publication Year :
2012

Abstract

Adipocytes store excess energy in the form of triglycerides and signal the levels of stored energy to the brain. Here we show that adipocyte-specific deletion of Arntl (also known as Bmal1), a gene encoding a core molecular clock component, results in obesity in mice with a shift in the diurnal rhythm of food intake, a result that is not seen when the gene is disrupted in hepatocytes or pancreatic islets. Changes in the expression of hypothalamic neuropeptides that regulate appetite are consistent with feedback from the adipocyte to the central nervous system to time feeding behavior. Ablation of the adipocyte clock is associated with a reduced number of polyunsaturated fatty acids in adipocyte triglycerides. This difference between mutant and wild-type mice is reflected in the circulating concentrations of polyunsaturated fatty acids and nonesterified polyunsaturated fatty acids in hypothalamic neurons that regulate food intake. Thus, this study reveals a role for the adipocyte clock in the temporal organization of energy regulation, highlights timing as a modulator of the adipocyte-hypothalamic axis and shows the impact of timing of food intake on body weight. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
10788956
Volume :
18
Issue :
12
Database :
Complementary Index
Journal :
Nature Medicine
Publication Type :
Academic Journal
Accession number :
83928418
Full Text :
https://doi.org/10.1038/nm.2979