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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2021-03-30T00:00:00-04:00" class="date-display-single">March 30, 2021</span></p><div class='syndicate'><h1>Fungi may impair wound healing in Crohn’s disease </h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<ul>
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<li>A fungus called <em>Debaryomyces hansenii</em> impaired gut wound healing in mice, and was also found in damaged gut tissue in people with Crohn’s disease.</li>
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<li>Blocking the microbe might help encourage tissue repair in this type of inflammatory bowel disease.</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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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2021/20210330-crohns.jpg?itok=PCOzBFOY&timestamp=1617045880 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/2021/20210330-crohns.jpg?itok=OYdtrqtt&timestamp=1617045880 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/2021/20210330-crohns.jpg?itok=oC-dJYqO&timestamp=1617045880 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/2021/20210330-crohns.jpg?itok=4R1D3bhu&timestamp=1617045880 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/2021/20210330-crohns.jpg?itok=PCOzBFOY&timestamp=1617045880" alt="Woman lying on sofa holding her stomach" title="Woman lying on sofa holding her stomach" />
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</picture><span class="caption">Understanding the relationship between the gut microbiome and inflammation may lead to better treatments for inflammatory bowel diseases like Crohn’s disease. </span><span class="credit">PeopleImages / E+ via Getty Images</span></div>
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</div><p>About 3 million people in the U.S. live with inflammatory bowel disease. This chronic condition develops when immune cells in the gut overreact to a perceived threat to the body. It’s thought that the microbiome—the bacteria, fungi, protozoa, and viruses that live in the intestines—plays a role in this process. Whatever the cause, this immune reaction can damage the cells that line the gastrointestinal tract.</p>
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||
<p>One major type of inflammatory bowel disease, called Crohn’s disease, can occur anywhere in the gastrointestinal tract, though it most often affects the small intestine and colon. Scientists have been studying the relationship between the gut microbiome and inflammation in Crohn’s disease, with a goal of developing targeted treatments.</p>
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<p>Researchers led by Dr. Thaddeus Stappenbeck, formerly from Washington University in St. Louis and now at the Cleveland Clinic, examined damaged intestinal tissue in a mouse model of Crohn’s disease. Their work was funded in part by NIH’s National Center for Complementary and Integrative Health (NCCIH), National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), and National Institute of Allergy and Infectious Diseases (NIAID). Results were published on March 12, 2021, in <em>Science</em>.</p>
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<p>The team gave antibiotics to mice with damaged intestinal tissue. Antibiotics are commonly given to people during a flare-up of Crohn’s disease to reduce complications that involve infection. However, such drugs can disturb the normal makeup of the microbiome.</p>
|
||
|
||
<p>The researchers found that the antibiotics impaired wound healing in the intestines. By about a week after the antibiotic treatments, fungi were found living in the intestinal wounds. When the mice received an anti-fungal drug, the wounds started to heal.</p>
|
||
|
||
<p>Genetic analysis showed that one fungus, a type of yeast called <em>Debaryomyces hansenii</em>, dominated in the wounds of mice given antibiotics. It was not found in nearby areas of healthy tissue. It also wasn’t found in the healing wounds of mice not given antibiotics. </p>
|
||
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||
<p>To see if the fungus impaired healing, the researchers fed it to other mice with intestinal wounds, without prior antibiotic administration. The fungus could later be found in the wounds, and wound healing was impaired.</p>
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||
<p>Further work revealed that <em>D</em>. <em>hansenii</em> caused the immune system to boost production of a signalling molecule called CCL5. When fed to mice that lacked CCL5, the fungus didn’t impair wound healing. Blocking CCL5 with drugs in normal mice had the same beneficial effect.</p>
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||
<p>Finally, the team looked for <em>D</em>. <em>hansenii</em> in tissue samples taken from seven people with Crohn’s disease and 10 without the condition. They found the yeast in all of the people with Crohn’s disease. Substantially more fungus was living within damaged tissue of the intestine than in undamaged regions. In contrast, <em>D</em>. <em>hansenii</em> was found in only one of the people without the condition. This enrichment of <em>D. hansenii</em> was also observed in additional groups of people with Crohn’s disease.</p>
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||
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||
<p><em>D</em>. <em>hansenii</em> isn’t a common component of the healthy human gut microbiome. It can live in extreme environments, and is also used in the food industry. However, it’s not known how its presence in the diet might affect people with Crohn’s disease.</p>
|
||
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||
<p>“The significance of our study is that we define a clear link between a specific gut microbe and wound healing response,” Stappenbeck says. “Targeting this infection may be a viable approach to treat the disease or develop diet-based prevention strategies.”</p>
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<p>—by Sharon Reynolds</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/gut-microbe-provokes-release-inflammatory-substance" target="_top">Gut Microbe Provokes Release of Inflammatory Substance</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/reduced-calorie-diet-lowers-signs-inflammatory-bowel-disease" target="_top">Reduced-Calorie Diet Lowers Signs of Inflammatory Bowel Disease</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/changing-gut-bacteria-crohns-disease" target="_top">Changing Gut Bacteria in Crohn’s Disease </a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/food-additives-alter-gut-microbes-cause-diseases-mice" target="_top">Food Additives Alter Gut Microbes, Cause Diseases in Mice</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/crohns-disease-triggers-may-include-viruses-other-factors" target="_top">Crohn’s Disease Triggers May Include Viruses and Other Factors</a></li><li><a href="https://newsinhealth.nih.gov/2020/02/gut-troubles" target="_top">Gut Troubles</a></li><li><a href="https://www.niddk.nih.gov/health-information/digestive-diseases/crohns-disease" target="_top">Crohn’s Disease</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://pubmed.ncbi.nlm.nih.gov/33707263/"><em>Debaryomyces</em> is enriched in Crohn’s disease intestinal tissue and impairs healing in mice.</a> Jain U, Ver Heul AM, Xiong S, Gregory MH, Demers EG, Kern JT, Lai CW, Muegge BD, Barisas DAG, Leal-Ekman JS, Deepak P, Ciorba MA, Liu TC, Hogan DA, Debbas P, Braun J, McGovern DPB, Underhill DM, Stappenbeck TS.<em> Science</em>. 2021 Mar 12;371(6534):1154-1159. doi: 10.1126/science.abd0919. PMID: 33707263.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Center for Complementary and Integrative Health (NCCIH), National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), and National Institute of Allergy and Infectious Diseases (NIAID); Department of Veterans Affairs; Crohn’s & Colitis Foundation; Lawrence C. Pakula, MD IBD Education and Innovation Fund; American College of Gastroenterology.</p>
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