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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2016-10-04T00:00:00-04:00" class="date-display-single">October 4, 2016</span></p><div class='syndicate'><h1>Brain cells that cool the body </h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<ul>
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<li>Researchers identified a set of heat-sensing brain cells in mice that prompt both nervous system and behavioral changes that cool the body.</li>
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<li>The study suggests an answer to the longstanding question of how the brain regulates body temperature.</li>
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<picture title="Illustration of neurons.">
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2016/20161004-neurons.jpg?itok=polcHlAW&timestamp=1475588878 1x" media="screen and (min-width: 960px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2016/20161004-neurons.jpg?itok=LejSmO6u&timestamp=1475588878 1x" media="screen and (min-width: 800px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium-small/public/news-events/research-matters/2016/20161004-neurons.jpg?itok=AE0BoYhV&timestamp=1475588878 1x" media="screen and (min-width: 600px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-small/public/news-events/research-matters/2016/20161004-neurons.jpg?itok=oVBtjXlc&timestamp=1475588878 1x" media="screen and (min-width: 480px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-tiny/public/news-events/research-matters/2016/20161004-neurons.jpg?itok=4KCvCkt3&timestamp=1475588878 1x" media="screen and (min-width: 0)" />
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2016/20161004-neurons.jpg?itok=LejSmO6u&timestamp=1475588878" alt="Illustration of neurons." title="Illustration of neurons." />
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</picture><span class="caption">Scientists have long sought to understand how cells in the brain regulate body temperature.</span><span class="credit">Svisio/ iStock/Thinkstock</span></div>
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</div><p>The body’s temperature is closely regulated. We sense temperature changes in the environment through specialized nerve cells in the outer layers of the skin. If we are too hot or too cold, our nervous system activates responses to help change our temperature. We can sweat to cool down or shiver to generate heat. Our blood vessels can constrict to conserve heat or expand to release heat. To avoid discomfort, we sometimes seek out different environments―choosing to go into an air conditioned room or sit by a heater.</p>
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<p>Exactly how our brains turn on these regulating systems and behaviors isn’t clear. A research team led by Dr. Zachary Knight at the University of California, San Francisco, searched for neurons that detect body temperature changes in the brain region that regulates nervous system functions like temperature and sleep: the preoptic area of the hypothalamus. The research was funded in part by NIH’s National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) and National Institute of Neurological Disorders and Stroke (NINDS). Results were published in <em>Cell</em> on September 22, 2016.</p>
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<p>Using a technique called phosphoTRAP, the researchers identified genes that were activated when mice were exposed to warm temperatures. They found a unique population of heat-sensitive brain cells that expressed high levels of neuropeptides called PACAP and BDNF. The team measured these cells’ activities while mice were exposed to temperature increases (from 25°C to 45°C) and decreases (from 25°C to 10°C) in a custom-built chamber. The specialized neurons were activated by warm temperatures, but not by cool temperatures.</p>
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<p>The scientists genetically inserted a light-responsive protein into the specialized cells to control their activity. This allowed the researchers to turn on the heat-sensing neurons using a fiber-optic light. When the cells were activated, the animals’ core body temperatures dropped. Blood vessels in the animals’ tails dilated to release heat, and fat-burning heat production decreased. The mice also spontaneously moved to a colder part of the chamber, suggesting that activation of these neurons can induce both nervous system and behavioral changes that reduce the body’s temperature.</p>
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||
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||
<p>Using imaging techniques, the researchers confirmed that the heat-sensing neurons reach into brain regions that control both nervous system responses and motivated behaviors. These specialized brain cells could be activated by stimulating heat-sensitive nerve cells in the animals’ skin, suggesting that the neurons use the body’s peripheral temperature sensors for heat detection.</p>
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<p>“We know a lot about how body temperature is regulated in peripheral tissues, and a bit about the key regulatory brain regions, but the identity of the neurons that act as the master regulators of body temperature has been elusive,” says Knight. The authors suggest that specific sets of heat and cold-sensing neurons sit within in the preoptic area to act as a central control center for body temperature; however, more research is needed to determine if such cold-sensitive cells also exist.</p>
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<p>―Tianna Hicklin, Ph.D.</p>
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</div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="https://www.nih.gov/news-events/nih-research-matters/shivering-triggers-brown-fat-produce-heat-burn-calories" target="_top">Shivering Triggers Brown Fat to Produce Heat and Burn Calories</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/sensing-temperature" target="_top">Sensing Temperature </a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/serotonin-helps-control-body-temperature-breathing" target="_top">Serotonin Helps Control Body Temperature and Breathing</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/warm-hands-warm-feelings" target="_top">Warm Hands, Warm Feelings</a></li><li><a href="https://newsinhealth.nih.gov/issue/Jul2013/Feature2" target="_top">Stay Cool: Getting Too Hot Can Be Dangerous</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://www.ncbi.nlm.nih.gov/pubmed/27616062">Warm-Sensitive Neurons that Control Body Temperature.</a> Tan CL, Cooke EK, Leib DE, Lin YC, Daly GE, Zimmerman CA, Knight ZA. <em>Cell.</em> 2016 Sep 22;167(1):47-59.e15. doi: 10.1016/j.cell.2016.08.028. Epub 2016 Sep 8. PMID: 27616062.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH New Innovator Award, NIH Common Fund, NIH’s National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) and National Institute of Neurological Disorders and Stroke (NINDS).</p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/research-context-can-we-slow-aging">Research in Context: Can we slow aging?</a></p>
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|
||
<p><a href="https://www.nih.gov/news-events/nih-research-matters/brain-changes-observed-during-pregnancy">Brain changes observed during pregnancy</a></p>
|
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|
||
<p><a href="https://www.nih.gov/news-events/nih-research-matters/research-context-detecting-cancer">Research in Context: Detecting cancer</a></p>
|
||
|
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/risk-future-burden-dementia-united-states">Risk and future burden of dementia in the United States </a></p>
|
||
|
||
<p><a href="https://www.nih.gov/news-events/nih-research-matters/complete-wiring-map-adult-fruit-fly-brain">Complete wiring map of an adult fruit fly brain</a></p>
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<h3 class="block__title">About NIH Research Matters</h3>
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<p><strong>Editor:</strong> Harrison Wein, Ph.D.</p>
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<p><strong>Assistant Editors:</strong> Vicki Contie and Brian Doctrow, Ph.D.</p>
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<p><strong><em>NIH Research Matters </em></strong>is a weekly update of NIH research highlights reviewed by NIH’s experts. It's published by the <a href="/institutes-nih/nih-office-director/office-communications-public-liaison">Office of Communications and Public Liaison</a> in the <a href="/institutes-nih/nih-office-director">NIH Office of the Director</a>.</p>
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<p>ISSN 2375-9593</p>
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