{"id":130182,"date":"2024-11-26T06:31:11","date_gmt":"2024-11-25T23:31:11","guid":{"rendered":"https:\/\/hotvideos24.online\/?p=130182"},"modified":"2024-11-26T06:31:11","modified_gmt":"2024-11-25T23:31:11","slug":"brains-locus-coeruleus-revealed-as-key-to-sleep-transitions","status":"publish","type":"post","link":"https:\/\/hotvideos24.online\/?p=130182","title":{"rendered":"Brain\u2019s Locus Coeruleus Revealed as Key to Sleep Transitions"},"content":{"rendered":"<p> <script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3711241968723425\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-layout-key=\"-fb+5w+4e-db+86\"\r\n     data-ad-client=\"ca-pub-3711241968723425\"\r\n     data-ad-slot=\"7910942971\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><br \/>\n<\/p>\n<div>\n<p><strong>Summary: <\/strong>A new study uncovers the role of the brain\u2019s locus coeruleus (LC) in regulating sleep cycles, managing transitions between NREM and REM sleep. This brainstem region alternates between activity peaks and troughs during sleep, acting like a clock to control sleep-state shifts.<\/p>\n<p>Stress disrupts LC activity, causing fragmented sleep and delayed REM onset, linking this region to sleep disorders. The findings, based on advanced neural targeting in mice, pave the way for treatments and biomarkers to address sleep disturbances and improve sleep quality in conditions like anxiety and insomnia.<\/p>\n<p><strong>Key Facts<\/strong>:<\/p>\n<ul class=\"wp-block-list\">\n<li>The locus coeruleus alternates between peaks and troughs to regulate sleep transitions.<\/li>\n<li>Elevated LC activity delays REM sleep and fragments NREM sleep, often due to stress.<\/li>\n<li>This research offers new avenues for diagnosing and treating sleep disorders.<\/li>\n<\/ul>\n<p><strong>Source: <\/strong>University of Lausanne<\/p>\n<p><strong>Researchers at the University of Lausanne have identified a novel role for the brain\u2019s \u2018locus coeruleus\u2019 in sleep and its disruptions. This brain region facilitates the transition between NREM and REM sleep states while maintaining an unconscious vigilance toward the external world. Stress disrupts its functions and negatively impacts on sleep quality.<\/strong><\/p>\n<p>Sleep disorders affect an increasing number of people, with potentially serious consequences for their health. Mammalian sleep consists of cycles between two states: non-rapid eye movement (NREM) sleep and rapid eye movement (REM) sleep. However, the rules governing these cycles remain poorly understood.<\/p>\n<p>A study led by Professor Anita L\u00fcthi, a researcher at the Department of Fundamental Neurosciences at the Faculty of Biology and Medicine at the University of Lausanne (UNIL), shows for the first time that the locus coeruleus (LC), a brainstem region, is involved in the organization of sleep.<\/p>\n<p>The LC has so far been known as the major regulator of the ability to react to challenging situations during wakefulness, not sleep.<\/p>\n<p>The study conducted by Anita L\u00fcthi and published in\u00a0<em>Nature Neuroscience<\/em>\u00a0now shows that the LC determines when the transition between the two sleep states is possible, showing that this brain area is crucial for the normal cyclicity of sleep states.<\/p>\n<p>Furthermore, the team discovered that experiences during the day, particularly stress, disrupt the activity of the LC during sleep and results in a disorganized sleep cycle and too frequent awakenings.<\/p>\n<p>These discoveries provide crucial insights for a better understanding of sleep disorders and could lead to improved treatments.<\/p>\n<p><strong>Sleep structure redefined<\/strong><\/p>\n<p>The LC, long recognized as the center of noradrenaline production \u2014 the primary hormone governing our ability to respond to environmental challenges by mobilizing the brain and body \u2014 is essential for cognitive wakefulness.<\/p>\n<p>During sleep, its activity becomes fluctuating, alternating between peaks and troughs at intervals of about 50 seconds. The role of this activity has remained poorly understood until now.<\/p>\n<p>Thanks to the implementation of advanced technologies, UNIL neuroscientists have been able to specifically target neuronal pathways in this brain region in mice.<\/p>\n<p>\u201cWe found that both peaks and troughs of the LC\u2019s fluctuating activity play key roles in sleep organization. This is a new structural element of sleep; it functions somewhat like a clock,\u201d explains Georgios Foustoukos, one of the study\u2019s three lead authors.<\/p>\n<p>Their results show that sleep is composed of previously unknown structural units, during which two functions are sequentially coordinated. During peaks of LC activity, part of the subcortical brain enters a more wake-like state, thanks to noradrenaline, allowing unconscious vigilance toward the environment and potential dangers. Conversely, during troughs, transitions to REM sleep are possible.<\/p>\n<p><strong>Two key functions for restorative sleep<\/strong><\/p>\n<p>Under normal conditions, human NREM sleep consists of four distinct stages that include the deepest stages of sleep. REM sleep, on the other hand, is characterized by high brain activity associated with dreams and occupies about a quarter of the night.<\/p>\n<p>A typical night alternates, in a coordinated manner, between NREM and REM states, allowing the body and mind to rest and recover.<\/p>\n<p>UNIL\u2019s neuroscientists have identified the LC as the gatekeeper of these transitions, precisely controlling when the shift from NREM to REM sleep can occur, notably at moments when its activity is low.<\/p>\n<p>Conversely, the scientists discovered that when LC activity is elevated, more noradrenaline is released into the brain, making certain areas of the brain more prone to become aroused, yet without actually waking up the organism.<\/p>\n<p>This state represents a previously unknown type of arousal that generates a vigilance toward the environment and body during sleep, facilitating a complete and rapid awakening in case of emergency.<\/p>\n<p>\u201cIn other words, the brain is semi-awake at the subcortical level while being asleep at the cortical level,\u201d says Anita L\u00fcthi.<\/p>\n<p><strong>A hope for sleep disorders<\/strong><\/p>\n<p>Another major insight of this study is the observation that stressful experiences during wakefulness in mice can disrupt sleep by increasing LC activity, which delays the onset of REM sleep and fragments NREM sleep by causing too many awakenings. These concern both subcortical and cortical parts of the brain.<\/p>\n<p>For Anita L\u00fcthi, the results pave the way for new clinical applications for people suffering from sleep disorders: \u201cOur discoveries can help better understand sleep disturbances associated with mental health disorders such as anxiety or other sleep disorders.<\/p>\n<p>\u201cMoreover, they offer avenues for new treatments, like using the LC as a biomarker to monitor and potentially correct sleep cycles. The strength of our work is that we bring the neural activity of the sleeping brain a big step closer to human sleep measures that we know from the hospital.\u201d<\/p>\n<p>Clinical collaborations with the Lausanne University Hospital (CHUV) have been initiated to assess whether the mechanisms identified in mice can be applied to human sleep.<\/p>\n<p>Finally, the study also provides cues to better understand sleep through the evolution of species. Unlike mammals with their two clearly distinct sleep states, some archaic species like reptiles do not show such a well-defined duality.<\/p>\n<p>However, several reptiles exhibit two types of sleep that alternate over a period of about 50 seconds. This suggests that precursors of LC activity already existed to structure their ancient sleep.<\/p>\n<h2 class=\"wp-block-heading\">About this sleep and neuroscience research news<\/h2>\n<p class=\"has-background\" style=\"background-color:#ffffe8\"><strong>Author: <\/strong><a href=\"http:\/\/neurosciencenews.com\/cdn-cgi\/l\/email-protection#513c343538302211243f383d7f3239\" target=\"_blank\" rel=\"noreferrer noopener\">G\u00e9raldine Falbriard<\/a><br \/><strong>Source: <\/strong><a href=\"https:\/\/unil.ch\" target=\"_blank\" rel=\"noreferrer noopener\">University of Lausanne<\/a><br \/><strong>Contact: <\/strong>G\u00e9raldine Falbriard \u2013 University of Lausanne<br \/><strong>Image: <\/strong>The image is credited to Neuroscience News<\/p>\n<p class=\"has-background\" style=\"background-color:#ffffe8\"><strong>Original Research: <\/strong>Closed access.<br \/>\u201c<a href=\"https:\/\/dx.doi.org\/10.1038\/s41593-024-01822-0\" target=\"_blank\" rel=\"noreferrer noopener\">Infraslow noradrenergic locus coeruleus activity fluctuations are gatekeepers of the NREM\u2013REM sleep cycle<\/a>\u201d by Anita L\u00fcthi et al. <em>Nature Neuroscience<\/em><\/p>\n<hr class=\"wp-block-separator has-text-color has-pale-cyan-blue-color has-alpha-channel-opacity has-pale-cyan-blue-background-color has-background\"\/>\n<p><strong>Abstract<\/strong><\/p>\n<p><strong>Infraslow noradrenergic locus coeruleus activity fluctuations are gatekeepers of the NREM\u2013REM sleep cycle<\/strong><\/p>\n<p>The noradrenergic locus coeruleus (LC) regulates arousal levels during wakefulness, but its role in sleep remains unclear.<\/p>\n<p>Here, we show in mice that fluctuating LC neuronal activity partitions non-rapid-eye-movement sleep (NREMS) into two brain\u2013autonomic states that govern the NREMS\u2013REMS cycle over ~50-s periods; high LC activity induces a subcortical\u2013autonomic arousal state that facilitates cortical microarousals, whereas low LC activity is required for NREMS-to-REMS transitions.<\/p>\n<p>This functional alternation regulates the duration of the NREMS\u2013REMS cycle by setting permissive windows for REMS entries during undisturbed sleep while limiting these entries to maximally one per ~50-s period during REMS restriction.<\/p>\n<p>A stimulus-enriched, stress-promoting wakefulness was associated with longer and shorter levels of high and low LC activity, respectively, during subsequent NREMS, resulting in more microarousal-induced NREMS fragmentation and delayed REMS onset.<\/p>\n<p>We conclude that LC activity fluctuations are gatekeepers of the NREMS\u2013REMS cycle and that this role is influenced by adverse wake experiences.<\/p>\n<p> <!-- Form created by Optin Forms plugin by WPKube: create beautiful optin forms with ease! --> <!-- https:\/\/wpkube.com\/ --><!--optinforms-form5-container--> <!-- \/ Optin Forms --> <\/div>\n<p><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3711241968723425\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-layout-key=\"-fb+5w+4e-db+86\"\r\n     data-ad-client=\"ca-pub-3711241968723425\"\r\n     data-ad-slot=\"7910942971\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><br \/>\n<br \/><div data-type=\"_mgwidget\" data-widget-id=\"1660802\">\r\n<\/div>\r\n<script>(function(w,q){w[q]=w[q]||[];w[q].push([\"_mgc.load\"])})(window,\"_mgq\");\r\n<\/script>\r\n<br \/>\n<br \/><a href=\"https:\/\/neurosciencenews.com\/locus-coeruleus-sleep-circadian-28132\/\">Source link <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Summary: A new study uncovers the role of the brain\u2019s locus coeruleus (LC) in regulating sleep cycles, managing transitions between NREM and REM sleep. This brainstem region alternates between activity &hellip; <a href=\"https:\/\/hotvideos24.online\/?p=130182\" class=\"more-link\">Read More<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-130182","post","type-post","status-publish","format-standard","hentry","category-health","entry"],"_links":{"self":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/posts\/130182","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=130182"}],"version-history":[{"count":0,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/posts\/130182\/revisions"}],"wp:attachment":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=130182"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=130182"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=130182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}