Circadian rhythms of hedonic drinking behavior in mice. (4th May 2017)

• Record Type: Journal Article
• Authors: Bainier, Claire; Mateo, Maria; Felder-Schmittbuhl, Marie-Paule; Mendoza, Jorge
• Is Part Of: Neuroscience. Volume 349(2017)
• Page Start: 229
• Page End: 238
• Publication Date: 2017-05-04
• Subjects: CP caudate–putamen -- CT circadian time -- DA dopamine -- DD constant darkness -- LD lightdark cycle -- MAPK mitogen-activated protein kinase -- NAcc nucleus accumbens -- Per Period -- PK2 Prokineticin 2 -- Ctx cortex -- OD optical density -- ORX orexin -- SCN suprachiasmatic nucleus -- VTA ventral tegmental area -- WT wild-type -- ZT zeitgeber time; circadian -- motivation -- sucrose -- drinking -- reward -- Per genes; Neurochemistry -- Periodicals; Neurophysiology -- Periodicals; Neurology -- Periodicals; Neurochimie -- Périodiques; Neurophysiologie -- Périodiques; Neurochemistry; Neurophysiology; Electronic journals; Periodicals; Electronic journals; 612.8
• DOI: 10.1016/j.neuroscience.2017.03.002
• Languages: English
• ISSNs: 0306-4522

Abstract

Highlights: Sucrose intake and preference show a daily and a circadian rhythm in mice. The Per2 gene expression in the brain is affected in sucrose-exposed animals. Per2 mutations lead to a loss of daily rhythms of sucrose intake and preference. Circadian rhythms of hedonic feeding are modulated by a brain timekeeping mechanism. Abstract: In mammals, the suprachiasmatic nucleus (SCN) of the hypothalamus is the site of the main circadian clock, synchronized by the light–dark cycle, which generates behavioral rhythms like feeding, drinking and activity. Notwithstanding, the main role of the SCN clock on the control of all circadian rhythms has been questioned due to the presence of clock activity in many brain areas, including those implicated in the regulation of feeding and reward. Moreover, whether circadian rhythms of particular motivated behaviors exist is unknown. Here, we evaluated the spontaneous daily and circadian behavior of consumption of a sweet caloric solution (5–10% sucrose), and the effects of sucrose intake on the expression of clock genes in the mouse brain. Mice showed a daily (in a light–dark cycle) and a circadian (in constant darkness conditions) rhythm in the intake and sucrose preference with a rise for both parameters at night (or subjective night). In addition, we observed changes in the circadian day-night expression of the clock gene Per2 in the SCN, cortex and striatum of animals ingesting sucrose compared to control mice on pure water. Finally, daily rhythms of sucrose intake and preference were abolished in Per2 Brdm1 - and double Per1 −/− Per2 Brdm1 -mutant animals. These data indicate that the expression of circadian rhythms of hedonic feeding behaviors may be controlled by brain circadian clocks and Per gene expression.