Journal ArticleDOI
Rapid eye movement sleep is initiated by basolateral amygdala dopamine signaling in mice
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TLDR
It is found that a transient increase of dopamine in the basolateral amygdala (BLA) during NREMSleep terminates NREM sleep and initiates REM sleep, which shows a critical role of DA signaling in the BLA in initiating REM sleep and provide a neuronal basis for sleep cycle generation.Abstract:
The sleep cycle is characterized by alternating non–rapid eye movement (NREM) and rapid eye movement (REM) sleeps. The mechanisms by which this cycle is generated are incompletely understood. We found that a transient increase of dopamine (DA) in the basolateral amygdala (BLA) during NREM sleep terminates NREM sleep and initiates REM sleep. DA acts on dopamine receptor D2 (Drd2)–expressing neurons in the BLA to induce the NREM-to-REM transition. This mechanism also plays a role in cataplectic attacks—a pathological intrusion of REM sleep into wakefulness—in narcoleptics. These results show a critical role of DA signaling in the BLA in initiating REM sleep and provide a neuronal basis for sleep cycle generation. Description Dopamine and the gating of REM sleep Sleep is composed of rapid eye movement (REM) and non-REM sleep, and REM sleep usually appears after periods of non-REM sleep. However, we do not understand the mechanisms by which the brain cycles between those states. Using fiber photometry, Hasegawa et al. found increases in dopamine activation before non-REM to REM transitions but not before non-REM to wake transitions in the basolateral amygdala (see the Perspective by Arrigoni and Fuller). This effect was mediated by dopamine receptor D2-expressing neurons in the amygdala. Artificially activating these neurons induced a transition from non-REM to REM sleep and cataplectic states in awake mice. —PRS Transient dopamine elevation in the amygdala during non-REM sleep plays a role in triggering the non-REM to REM sleep transition.read more
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Design and Synthesis of Orexin 1 Receptor-Selective Agonists.
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References
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TL;DR: In this article, the authors design and use several optogenetic tools to causally investigate the cellular E/I balance hypothesis in freely moving mammals, and explore the associated circuit physiology.
Neocortical excitation/inhibition balance in information processing and social
Lief E. Fenno,Matthias Prigge,Franziska Schneider,Thomas J. Davidson,Vikaas S. Sohal,Inbal Goshen,Joel Finkelstein,Jeanne T. Paz,Katja Stehfest,Roman Fudim,Charu Ramakrishnan,John R. Huguenard,Peter Hegemann,Karl Deisseroth +13 more
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The sleep switch: hypothalamic control of sleep and wakefulness
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Genetic Ablation of Orexin Neurons in Mice Results in Narcolepsy, Hypophagia, and Obesity
Junko Hara,Carsten T. Beuckmann,Tadahiro Nambu,Jon T. Willie,Richard M. Chemelli,Christopher M. Sinton,Fumihiro Sugiyama,Ken-ichi Yagami,Katsutoshi Goto,Masashi Yanagisawa,Takeshi Sakurai +10 more
TL;DR: Evidence is provided that orexin-containing neurons play important roles in regulating vigilance states and energy homeostasis and the pathophysiology and treatment of narcolepsy.
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Functional neuroanatomy of human rapid-eye-movement sleep and dreaming.
Pierre Maquet,J.M. Peters,Joël Aerts,Guy Delfiore,Christian Degueldre,André Luxen,Georges Franck +6 more
TL;DR: A group study of seven subjects who maintained steady REM sleep during brain scanning and recalled dreams upon awakening shows that regional cerebral blood flow is positively correlated with REM sleep in pontine tegmentum, left thalamus, both amygdaloid complexes, anterior cingulate cortex and right parietal operculum.