Journal of Obesity & Weight Loss Therapy
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Circadian rhythms are biological rhythms that control most aspects of mammalian physiology. These rhythms are generated
by an endogenous mechanism called the circadian clock. We have demonstrated that disruption of circadian rhythm
abolishes energy homeostasis and induces obesity in mice independent of all previous identified risk factors for obesity, and that
the expression of the key peripheral adiposity signal leptin is primarily controlled by the molecular clock in the fat tissue but not
exogenous food cues. Disruption of circadian homeostasis in mice by circadian gene mutation or jet-lag abolishes the circadian
homeostasis of leptin expression and induces Leptin resistance in mice, a key pathophysiological mechanism for human obesity.
Using in vivo ChIP approach, we demonstrated that the molecular clock directly control the transcription of leptin in the fat
tissue by rhythmically competing with other transcription factors to bind to the same promoter region on the leptin promoter.
We propose that disruption of circadian control of Leptin expression and signaling is a major contributor to the diverse metabolic
consequences of circadian disruption
Loning Fu has completed her Ph.D from the University of Calgary and postdoctoral trainings inUniversity of Toronto and Baylor College of Medicine.
Her studies have lead to the discovery ofthe role of the mammalian circadian clock in tumor suppression. Recent progress in the Fu lab have also
revealed that the circadian homeostasis of Leptin expression and signaling plays a key role in energy homeostasis, and that disruption of circadian
rhythm increases the risk of obesity and obesity-related cancersindependent of all previously identified risk factors.
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