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<h2 class="element-invisible">You are here</h2><div class="breadcrumb"><a href="/">Home</a> » <a href="/news-events">News & Events</a> » <a href="/news-events/nih-research-matters">NIH Research Matters</a></div> <div class="l-region l-region--section-header">
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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2021-04-13T00:00:00-04:00" class="date-display-single">April 13, 2021</span></p><div class='syndicate'><h1>How stress causes hair loss </h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<ul>
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<li>Researchers found that a stress hormone impairs stem cells necessary for hair growth in mice. </li>
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<li>The findings suggest potential ways to treat hair loss caused by chronic stress.</li>
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</ul></div><div class="media-float-right"><div class="ds-1col file file-image file-image-jpeg view-mode-floated_media clearfix">
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<picture title="Troubled young Asian woman checking for thinning hair in mirror">
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<!--[if IE 9]><video style="display: none;"><![endif]-->
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2021/20210413-hair.jpg?itok=PizRl2Bl&timestamp=1618237017 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/2021/20210413-hair.jpg?itok=ZB8Pr62o&timestamp=1618237017 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/2021/20210413-hair.jpg?itok=LL_3dvuS&timestamp=1618237017 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/2021/20210413-hair.jpg?itok=XNIO7Ul-&timestamp=1618237017 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/2021/20210413-hair.jpg?itok=UxSVpyKI&timestamp=1618237017 1x" media="screen and (min-width: 0)" />
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<!--[if IE 9]></video><![endif]-->
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2021/20210413-hair.jpg?itok=ZB8Pr62o&timestamp=1618237017" alt="Troubled young Asian woman checking for thinning hair in mirror" title="Troubled young Asian woman checking for thinning hair in mirror" />
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</picture><span class="caption">The study sheds light on how stress can lead to hair loss. </span><span class="credit">Prostock-Studio / iStock / Getty Images Plus</span></div>
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</div><p>Long-term, or chronic, stress puts people at risk for a variety of health problems. These can include depression and anxiety, as well as problems with digestion and sleep. Chronic stress has also long been linked to hair loss, but the reasons weren’t well understood. </p>
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||
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||
<p>Hair growth involves three stages. In growth (anagen), strands of hair push through the skin. In degeneration (catagen), hair ceases to grow, and the follicle at the base of the strand shrinks. In rest (telogen), hair falls out and the process can begin again. Hair is among the few tissues that mammals can regenerate throughout their lifetime.</p>
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||
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||
<p>The hair growth cycle is driven by stem cells that reside in the hair follicle. During growth, stem cells divide to become new cells that regenerate hair. In the resting period, the stem cells are inactive. Until now, researchers hadn’t determined exactly how chronic stress impaired hair follicle stem cells.</p>
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||
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||
<p>A team led by Dr. Ya-Chieh Hsu of Harvard University studied the underlying mechanisms that link stress and hair loss. The study was supported in part by NIH’s National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS). Results appeared in <em>Nature</em>, on March 4, 2021.</p>
|
||
|
||
<p>The researchers began by testing the role of the adrenal glands, which produce key stress hormones—corticosterone in rodents and cortisol in humans. Removing the adrenal glands from mice led to rapid cycles of hair regrowth. Hair follicle regeneration didn’t slow as these mice grew older, like it did in control mice. Rather, hair follicle stem cells continued to enter the growth phase and regenerate hair follicles throughout the animals’ lifespans. The team was able to restore the normal hair cycle by feeding the mice corticosterone.</p>
|
||
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||
<p>Subjecting mice to mild stress over many weeks increased corticosterone levels and reduced hair growth. Hair follicles remained in an extended resting phase. Together, these findings supported the role of corticosterone in inhibiting hair regrowth.</p>
|
||
|
||
<p>The scientists next examined how corticosterone affects hair follicle stem cells. They found that the stress hormone was not regulating stem cells directly. By deleting the receptor for corticosterone from different cells, they determined that the hormone acts on a cluster of cells underneath the hair follicle called the dermal papilla.</p>
|
||
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||
<p>Further studies revealed that corticosterone prevented the dermal papilla from secreting GAS6, a molecule they showed can activate hair follicle stem cells. Delivering GAS6 into the skin restored hair growth in mice fed corticosterone or undergoing chronic stress.</p>
|
||
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||
<p>Last year, <a href="https://www.nih.gov/news-events/nih-research-matters/how-stress-causes-gray-hair">findings from Hsu’s team</a> advanced the understanding of how stress causes gray hair. These results reveal a key pathway involved in hair loss from chronic stress. These findings may also lead to further insights into how stress affects tissue regeneration in other parts of the body.</p>
|
||
|
||
<p>“In the future, the Gas6 pathway could be exploited for its potential in activating stem cells to promote hair growth,” says first author Dr. Sekyu Choi of Harvard University. However, further study is needed to understand whether the same mechanism is at work in people.</p>
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<p>—by Erin Bryant</p></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/how-stress-causes-gray-hair" target="_top">How Stress Causes Gray Hair </a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/hairy-human-skin-generated-stem-cells" target="_top">Hairy Human Skin Generated from Stem Cells</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/what-goosebumps-are" target="_top">What Goosebumps Are For</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/some-melanomas-may-start-hair-follicles" target="_top">Some Melanomas May Start in Hair Follicles</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/molecular-effects-social-stress" target="_top">Molecular Effects of Social Stress</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/stress-hormone-causes-epigenetic-changes" target="_top">Stress Hormone Causes Epigenetic Changes</a></li><li><a href="https://newsinhealth.nih.gov/2021/01/feeling-stressed" target="_top">Feeling Stressed? Ways to Improve Your Well-Being</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://pubmed.ncbi.nlm.nih.gov/33790465/">Corticosterone inhibits GAS6 to govern hair follicle stem-cell quiescence.</a> Choi S, Zhang B, Ma S, Gonzalez-Celeiro M, Stein D, Jin X, Kim ST, Kang YL, Besnard A, Rezza A, Grisanti L, Buenrostro JD, Rendl M, Nahrendorf M, Sahay A, Hsu YC. <em>Nature.</em> 2021 Mar 31. doi: 10.1038/s41586-021-03417-2. Online ahead of print. PMID: 33790465.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), National Institute of Neurological Disorders and Stroke (NINDS), National Heart, Lung, and Blood Institute (NHLBI), National Institute of Mental Health (NIMH), and National Institute on Aging (NIA); New York Stem Cell Foundation; Broad Institute Fellows Program; Society of Fellows of Harvard University; Smith Family Foundation Odyssey Award; Pew Charitable Trusts; Harvard Stem Cell Institute; Harvard HMS Dean’s Award; American Cancer Society; James and Audrey Foster MGH Research Scholar Award; NARSAD Young Investigator Award; MGH ECOR Fund for Medical Discovery; New York State Department of Health.</p>
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