Fiche publication
Date publication
décembre 2015
Journal
Proceedings of the National Academy of Sciences of the United States of America
Auteurs
Membres identifiés du Cancéropôle Est :
Pr CHAMBON Pierre
,
Dr MUKHERJI Atish
Tous les auteurs :
Mukherji A, Kobiita A, Damara M, Misra N, Meziane H, Champy MF, Chambon P
Lien Pubmed
Résumé
The light-entrained master central circadian clock (CC) located in the suprachiasmatic nucleus (SCN) not only controls the diurnal alternance of the active phase (the light period of the human light-dark cycle, but the mouse dark period) and the rest phase (the human dark period, but the mouse light period), but also synchronizes the ubiquitous peripheral CCs (PCCs) with these phases to maintain homeostasis. We recently elucidated in mice the molecular signals through which metabolic alterations induced on an unusual feeding schedule, taking place during the rest phase [i.e., restricted feeding (RF)], creates a 12-h PCC shift. Importantly, a previous study showed that the SCN CC is unaltered during RF, which creates a misalignment between the RF-shifted PCCs and the SCN CC-controlled phases of activity and rest. However, the molecular basis of SCN CC insensitivity to RF and its possible pathological consequences are mostly unknown. Here we deciphered, at the molecular level, how RF creates this misalignment. We demonstrate that the PPARα and glucagon receptors, the two instrumental transducers in the RF-induced shift of PCCs, are not expressed in the SCN, thereby preventing on RF a shift of the master SCN CC and creating the misalignment. Most importantly, this RF-induced misalignment leads to a misexpression (with respect to their normal physiological phase of expression) of numerous CC-controlled homeostatic genes, which in the long term generates in RF mice a number of metabolic pathologies including diabetes, obesity, and metabolic syndrome, which have been reported in humans engaged in shift work schedules.
Mots clés
Animals, Circadian Clocks, physiology, Circadian Rhythm, Diabetes Mellitus, metabolism, Disease Models, Animal, Eating, physiology, Feeding Behavior, Gene Expression Regulation, Glycogen Synthase Kinase 3, metabolism, Glycogen Synthase Kinase 3 beta, Hypercholesterolemia, metabolism, Hypertriglyceridemia, metabolism, Liver, metabolism, Male, Metabolic Syndrome X, metabolism, Mice, Mice, Inbred C57BL, Period Circadian Proteins, metabolism, Phosphorylation, Photoperiod, Sterol Regulatory Element Binding Protein 1, metabolism, Suprachiasmatic Nucleus, physiology, Time Factors, Work Schedule Tolerance
Référence
Proc. Natl. Acad. Sci. U.S.A.. 2015 Dec;112(48):E6691-8
