{"id":4275,"date":"2018-05-31T14:35:00","date_gmt":"2018-05-31T21:35:00","guid":{"rendered":"https:\/\/dornsife.usc.edu\/news\/stories\/hunger-peptides-sent-through-the-brains-fluid-give-you-an-appetite\/"},"modified":"2023-04-19T11:08:08","modified_gmt":"2023-04-19T18:08:08","slug":"hunger-peptides-found-in-brain-fluid","status":"publish","type":"post","link":"https:\/\/dornsife.usc.edu\/news\/stories\/hunger-peptides-found-in-brain-fluid\/","title":{"rendered":"Hunger peptides sent through the brain\u2019s fluid give you an appetite"},"content":{"rendered":"\n\n\n    \n            \n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--article-hero \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--article-hero\"\n    \n      >\n\n    \n<div class=\"inner-wrapper\">\n          \n<div class=\"f--field f--image\">\n\n    \n    \n    \n    \n    \n    \n              \n      <img\n                            data-src=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2023\/04\/story-2815-768x432.jpg\"\n          data-srcset=\"https:\/\/dornsife.usc.edu\/news\/wp-content\/uploads\/sites\/7\/2023\/04\/story-2815-768x432.jpg 768w\"          data-sizes=\"(min-width:1200px) 75vw, (min-width:768px) 83vw, 100vw\"          class=\"lazyload\"\n        \n                  alt=\"Hunger peptides sent through the brain\u2019s fluid give you an appetite\"\n        \n        \n                                      \/>\n\n    \n    \n  \n  \n\n<\/div>\n  \n      <div class=\"image-caption\">\n          \n<div class=\"f--field f--description\">\n\n    \n  Scientists have figured out how your brain tells you that you are hungry. A neuropeptide (green) associated with appetite is sent into the cerebrospinal fluid to connect with neurons responsible for causing hunger (yellow). Photo courtesy of Scott Kanoski.\n\n\n<\/div>\n    <\/div>\n  \n  <div class=\"text-wrapper\">\n          <nav aria-label=\"Breadcrumb\" class=\"breadcrumbs\">\n        <ul>\n                      <li><a href=\"\/news\/stories\/\">News<\/a><\/li>\n                      <li><a href=\"\/news\/stories\/\/?category=faculty\">Faculty<\/a><\/li>\n                  <\/ul>\n      <\/nav>\n    \n              \n<div class=\"f--field f--page-title\">\n\n    \n  <h1>Hunger peptides sent through the brain\u2019s fluid give you an appetite<\/h1>\n\n\n<\/div>\n    \n          <div class=\"subtitle\">\n            \n<div class=\"f--field f--description\">\n\n    \n  The brain\u2019s plumbing system is a channel of communication that tells you when you are hungry, USC Dornsife scientists find.\n\n\n<\/div>\n      <\/div>\n    \n           <strong class=\"author-field\"><span >By<\/span><a href=\"mailto:communication@dornsife.usc.edu\">Emily Gersema<\/a><\/strong>\n    \n          <span class=\"post-date-field\">May 31, 2018<\/span>\n      <\/div>\n<\/div>\n\n\n  <\/div><\/div>\n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--social-share \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--social-share\"\n    \n      >\n\n    \n  <div class=\"content-wrapper\">\n    <span class=\"a2a_kit a2a_kit_size_32 addtoany_list\" style=\"line-height: 32px;\">\n      <span class=\"title\">\n        Share\n      <\/span>\n                        <a class=\"a2a_button_copy_link\" target=\"_blank\" href=\"\/#copy_link\" rel=\"nofollow noopener\" title=\"Link\">\n            <span class=\"a2a_svg a2a_s__default a2a_s_copy_link\">\n              <svg height=\"19\" viewBox=\"0 0 19 19\" width=\"19\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"m7.43475275 9.52380952-2.17490843 2.26076008c-1.08745421 1.058837-1.68841575 2.518315-1.68841575 4.0350275 0 1.5167124.60096154 2.9475732 1.68841575 4.0350274 1.058837 1.0874543 2.51831502 1.6884158 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xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"m8.14285714 9.42857143c-.17142857 0-.34285714 0-.51428571.08571428l7.28571427 6.34285719c.3428572.2571428.6857143.2571428.9428572 0l7.2857142-6.34285719c-.0857142-.08571428-.2571428-.08571428-.4285714-.08571428zm-1.28571428 1.11428567v.1714286 8.5714286c0 .6857143.6 1.2857143 1.28571428 1.2857143h14.57142856c.6857143 0 1.2857143-.6 1.2857143-1.2857143v-8.5714286c0-.0857143 0-.0857143 0-.1714286l-7.2 6.3428572c-.7714286.6857143-1.8857143.6857143-2.6571429 0z\" fill-rule=\"evenodd\" transform=\"translate(-6 -9)\"\/><\/svg>\n            <\/span>\n            <span class=\"a2a_label visually-hidden\">Email<\/span>\n          <\/a>\n                  <\/span>\n  <\/div>\n\n  <\/div><\/div>\n  \n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--rich-text \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--rich-text\"\n    \n      >\n\n    \n      \n<div class=\"f--field f--wysiwyg\">\n\n    \n  <p>A USC Dornsife study shows the brain&rsquo;s plumbing system serves double duty, flushing waste and channeling a hunger molecule that tells you when you should eat.<\/p>\n<p>&ldquo;People usually think of brain cells as communicating signals through the synapses between them,&rdquo; said Emily Noble, postdoctoral fellow in <a href=\"https:\/\/dornsife.usc.edu\/bisc\" target=\"_blank\">biological sciences<\/a> at USC Dornsife. &ldquo;We are showing that the brain has another complementary way to communicate by sending these signals into the cerebrospinal fluid.&rdquo;<\/p>\n<p>In cell-to-cell communication, the neurons are discretely passing notes to individual neurons or other cells. However, cerebrospinal fluid distributes a newsletter to many subscribers.<\/p>\n<p>Scientists have long known that signals are sent from cell to cell, or through release into blood vessels. The study, published today in the journal <a href=\"https:\/\/www.cell.com\/cell-metabolism\/fulltext\/S1550-4131(18)30308-5.\" target=\"_blank\"><i>Cell Metabolism<\/i><\/a>, shows that the brain regulates some processes by releasing and dispersing molecules, and in this case, a neuropeptide, through cerebrospinal fluid.<\/p>\n<p>Drug developers are interested in creating pharmaceuticals that would target the MCH system to control appetite, and thereby address obesity and other weight-related health problems.<\/p>\n<p><strong>One fluid, many purposes<\/strong><\/p>\n<p>Cerebrospinal fluid has three chief assignments. First, its grueling eternal task is buoyancy: Like the Greek Titan Atlas lifting Earth, cerebrospinal fluid supports the brain. Second, it acts as a cushion after a blow to the head. Third, it is the brain&rsquo;s sewer system, clearing away metabolic waste. But its function doesn&rsquo;t end there.<\/p>\n<p>As neuroscience technologies have advanced, scientists have seen indications that what is sometimes dismissed as sewage actually has a role in the brain&rsquo;s regulation of behaviors such as stress, energy balance and reproduction.<\/p>\n<p>&ldquo;The cerebrospinal fluid had been historically thought more of as a metabolic wasteland,&rdquo; said Scott Kanoski, assistant professor of biological sciences at USC Dornsife and the study&rsquo;s corresponding author. &ldquo;But what we are showing is that the fluid is an active mechanism for communication in the brain.&rdquo;<\/p>\n<p><strong>Hunger peptides <\/strong><\/p>\n<p>For their study, the researchers focused on the molecule &ldquo;melanin-concentrating hormone&rdquo; (MCH). This neuropeptide is generated by neurons in the brain&rsquo;s hunger center, the lateral hypothalamus, at the base of the brain just above the pituitary gland. A protein molecule, MCH stimulates appetite. It also can slow energy expenditure.<\/p>\n<p>Through a series of experiments with rats, the researchers stimulated release of the hunger peptide and then tracked it in the cerebrospinal fluid.<\/p>\n<p>&ldquo;When we released MCH into the cerebrospinal fluid, the animals would start eating,&rdquo; Kanoski said. &ldquo;When we reduced the levels of the molecule, then we saw the opposite effect and the animals would eat less.&rdquo;<\/p>\n<p>Based on their findings, the researchers determined the peptide&rsquo;s release is likely influenced by the body&rsquo;s circadian clock and a daily mealtime routine.&nbsp;<\/p>\n<p>The researchers have some lingering questions about the hunger molecule that they hope will be answered with further investigation: Is MCH released from the brain in some special form that protects it from damage or other degradation? How exactly does it travel into the cerebrospinal fluid and where does it go from there?<\/p>\n<p>Kanoski added that they wonder what other behaviors, besides feeding, the cerebrospinal fluid helps to regulate.<\/p>\n<p><strong>About the study<\/strong><\/p>\n<p>The study was supported by institutional grants to Kanoski (DK104897), co-author Suzanne M. Appleyard at Washington State University (DK083452), Ted M. Hsu at USC Dornsife (DK107333) and Noble (DK111158).<\/p>\n<p>Other study co-authors were Martin Darvas at the University of Washington; Vaibhav R. Konanur at the University of Illinois; and Joel D.&nbsp; Hahn,&nbsp; Alyssa M. Cortella, Clarissa Liu, Monica Song, Andrea Suarez, Caroline C. Szujewski, Danielle Rider and Jamie E. Clarke, all at USC Dornsife.<\/p>\n\n\n\n<\/div>\n\n\n  <\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>The brain\u2019s plumbing system is a channel of communication that tells you when you are hungry, USC Dornsife scientists find.<\/p>\n","protected":false},"author":0,"featured_media":4278,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[10],"tags":[117,481],"class_list":["post-4275","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faculty","tag-biology","tag-scott-kanoski"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hunger peptides sent through the brain\u2019s fluid give you an appetite<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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