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2015 ; 22
(3
): 448-59
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Circadian Dysfunction Induces Leptin Resistance in Mice
#MMPMID26166747
Kettner NM
; Mayo SA
; Hua J
; Lee C
; Moore DD
; Fu L
Cell Metab
2015[Sep]; 22
(3
): 448-59
PMID26166747
show ga
Circadian disruption is associated with obesity, implicating the central clock in
body weight control. Our comprehensive screen of wild-type and three circadian
mutant mouse models, with or without chronic jet lag, shows that distinct genetic
and physiologic interventions differentially disrupt overall energy homeostasis
and Leptin signaling. We found that BMAL1/CLOCK generates circadian rhythm of
C/EBP?-mediated leptin transcription in adipose. Per and Cry mutant mice show
similar disruption of peripheral clock and deregulation of leptin in fat, but
opposite body weight and composition phenotypes that correlate with their
distinct patterns of POMC neuron deregulation in the arcuate nucleus. Chronic jet
lag is sufficient to disrupt the endogenous adipose clock and also induce central
Leptin resistance in wild-type mice. Thus, coupling of the central and peripheral
clocks controls Leptin endocrine feedback homeostasis. We propose that Leptin
resistance, a hallmark of obesity in humans, plays a key role in circadian
dysfunction-induced obesity and metabolic syndromes.