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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2017-06-13T00:00:00-04:00" class="date-display-single">June 13, 2017</span></p><div class='syndicate'><h1>Fungi in the gut linked to alcoholic liver disease</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
<ul>
<li>Researchers uncovered a key role for intestinal fungi in the liver damage seen in alcoholic liver disease.</li>
<li>An antifungal drug protected mice from alcohol-related liver disease progression.</li>
<li>Preliminary findings suggest that antifungal drugs could also have potential for treating alcoholic liver disease in people, but further study will be needed.</li>
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<picture title="Photomicrograph of liver tissue specimen with dark chains of fungi.">
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2017/20170613-fungus.jpg?itok=Df3IVs16&amp;timestamp=1497358970" alt="Photomicrograph of liver tissue specimen with dark chains of fungi." title="Photomicrograph of liver tissue specimen with dark chains of fungi." />
</picture><span class="caption">In a preliminary finding, the intestines of people with chronic alcohol abuse had a large increase in Candida fungi, seen here in a tissue specimen.</span><span class="credit">CDC/Dr. Kaplan</span></div>
</div><p>Alcoholic liver disease includes a broad range of liver diseases, from simple steatosis (fatty liver) to end-stage liver disease, or cirrhosis (liver cell death). Liver cirrhosis is a leading cause of death worldwide, and alcohol abuse accounts for about half of these deaths. The need for a treatment for alcoholic liver disease is crucial.</p>
<p>Alcohol abuse can change the community of microorganisms, or microbiome, in the intestine. It encourages bacterial and fungal overgrowth, and can also cause a leaky gut barrier, which allows substances to enter the bloodstream. Studies have linked changes in intestinal fungal communities with other illnesses, but research related to alcoholic liver disease has primarily focused on bacteria.</p>
<p>A team led by Dr. Bernd Schnabl at the University of California, San Diego, and Dr. Derrick Fouts at the J. Craig Venter Institute set out to investigate fungal overgrowth in the intestines and determine its role in alcoholic liver disease. Their work was funded in part by NIHs National Institutes of Alcohol Abuse and Alcoholism (NIAAA). The study appeared online on May 22, 2017, in the<em> Journal of Clinical Investigation</em>.</p>
<p>The researchers fed mice a liquid diet over the course of eight weeks with an escalating number of calories from alcohol (ethanol). Control mice received the same number of calories from isomaltose. The ethanol-containing diet caused liver damage along with a surge of intestinal fungal growth. It also increased fungal products in the animals blood. This is likely due both to the rise in fungal populations and leakage from the gut.</p>
<p>Fungal cell wall components are known to activate inflammatory elements of the immune system through a receptor called CLEC7A. The researchers examined this immune pathway in liver immune cells and found high levels of activity in ethanol-fed mice. Mice without CLEC7A, in contrast, were protected from ethanol-induced liver disease.</p>
<p>When the researchers treated mice with an antifungal drug called amphotericin B, it lessened the level of ethanol-associated liver disease. The drug reduced fungal overgrowth in the gut, lowered levels of fungal products in the bloodstream, and dampened the inflammatory response.</p>
<p>In a preliminary study, the researchers found that people who were alcohol-dependent had distinct differences in their intestinal fungi relative to healthy people. Blood samples revealed increased exposure and immune response to fungal products. This elevated immune response was linked to the likelihood of death in patients with alcoholic cirrhosis. A larger study, however, will be required to confirm these findings.</p>
<p>Taken together, these results illustrate the importance of alcohol-induced changes to intestinal fungi in alcoholic liver disease. They also suggest that antifungal agents like amphotericin B might be useful as a therapy. “Since it was so effective in mice, we are interested in testing amphotericin B in patients with alcohol-related liver disease—a population in urgent need of new therapeutics,” Schnabl says.</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/healthy-human-microbiome" target="_top">The Healthy Human Microbiome</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/diet-affects-autoinflammatory-disease-gut-microbes" target="_top">Diet Affects Autoinflammatory Disease Via Gut Microbes</a></li><li><a href="https://www.niddk.nih.gov/health-information/liver-disease" target="_top">Liver Disease</a></li><li><a href="https://www.niaaa.nih.gov/alcohol-health" target="_top">Alcohol &amp; Your Health</a></li></ul><p class="footnote"><strong class="label-inline">References:&nbsp;</strong><a href="https://www.ncbi.nlm.nih.gov/pubmed/28530644">Intestinal fungi contribute to development of alcoholic liver disease</a>. Yang AM, Inamine T, Hochrath K, Chen P, Wang L, Llorente C, Bluemel S, Hartmann P, Xu J, Koyama Y, Kisseleva T, Torralba MG, Moncera K, Beeri K, Chen CS, Freese K, Hellerbrand C, Lee SM, Hoffman HM, Mehal WZ, Garcia-Tsao G, Mutlu EA, Keshavarzian A, Brown GD, Ho SB, Bataller R, Stärkel P, Fouts DE, Schnabl B. <em>J Clin Invest.</em> 2017 May 22. pii: 90562. doi: 10.1172/JCI90562. [Epub ahead of print]. PMID: 28530644.</p><p class="footnote"><strong class="label-inline">Funding:&nbsp;</strong>NIHs National Institute on Alcohol Abuse and Alcoholism (NIAAA) and National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK); VA Office of Research and Development; Swiss National Science Foundation; and Wellcome Trust.</p>
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