Effects of feeding time on daily rhythms of neuropeptide and clock gene expression in the rat hypothalamus

文献类型： 外文期刊

第一作者： Opperhuizen, Anne-Loes

作者： Opperhuizen, Anne-Loes;Su, Yan;Kalsbeek, Andries;Wang, Dawei;Opperhuizen, Anne-Loes;Su, Yan;Kalsbeek, Andries;Wang, Dawei;Reznick, Jane;Turner, Nigel;Cooney, Gregory J.;Cooney, Gregory J.;Cooney, Gregory J.;Kalsbeek, Andries

作者机构：

关键词： Feeding time;Clock genes;Daily rhythm;Hypothalamus;GABA;Neuropeptides

期刊名称：BRAIN RESEARCH （ 影响因子：3.252； 五年影响因子：3.582 ）

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收录情况： SCI

摘要： Shiftworkers are exposed to several adverse health conditions, one being eating at night. Food consumption at an unnatural time-of-day is thought to be one of the main factors responsible for the increased risk of developing metabolic diseases, such as obesity and diabetes mellitus. The underlying mechanism is considered to include disruption of the circadian organization of physiology, leading to disruption of metabolism. When food is consumed at night, the hypothalamus, a brain region central to homeostasis, receives contradicting input from the central clock and the systemic circulation. This study investigated how timing of feeding affects hypothalamic function by studying, in different hypothalamic nuclei, expression of clock genes and key neuropeptide genes involved in energy metabolism, including orexin, melanin-concentrating hormone (MCH) and neuropeptide Y. Animals with food available ad libitum showed diurnal variation in the expression of clock genes Peri and Pert in the perifornical area and arcuate nucleus. Clock gene rhythms were lost in both nuclei when food was restricted to the light (i.e., sleep) period. Neuropeptide genes did not display significant daily variation in either feeding groups, except for orexin-receptor 1 in ad libitum animals. Analysis of genes involved in glutamatergic and GABAergic signaling did not reveal diurnal variation in expression, nor effects of feeding time. In conclusion, feeding at the 'wrong' time-of-day not only induces desynchronization between brain and body clocks but also within the hypothalamus, which may contribute further to the underlying pathology of metabolic dysregulation. (C) 2017 Elsevier B.V. All rights reserved.

分类号： R741

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