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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2019-10-15T00:00:00-04:00" class="date-display-single">October 15, 2019</span></p><div class='syndicate'><h1>Gut microbes affect harmful compound in red meat </h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<ul>
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<li>Researchers identified an enzyme in gut bacteria that releases an inflammation-causing carbohydrate from meat.</li>
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<li>Preventing this carbohydrate from entering the body’s tissues could potentially reduce the risk of diseases associated with eating red meat.</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="Minced red meat in Petri dishes">
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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/2019/20191015-meat.jpg?itok=o2Ulg7f9&timestamp=1570819633 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/2019/20191015-meat.jpg?itok=VT44xDUn&timestamp=1570819633 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/2019/20191015-meat.jpg?itok=QOyuGqTh&timestamp=1570819633 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/2019/20191015-meat.jpg?itok=R0fGies_&timestamp=1570819633 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/2019/20191015-meat.jpg?itok=Cb1yPOKp&timestamp=1570819633 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/2019/20191015-meat.jpg?itok=VT44xDUn&timestamp=1570819633" alt="Minced red meat in Petri dishes" title="Minced red meat in Petri dishes" />
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</picture><span class="caption">Scientists have been working to understand why diets rich in red meats have been linked to certain inflammatory diseases. </span><span class="credit">Svetlana-Cherruty / iStock / Getty Images Plus</span></div>
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||
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</div><p>Diet can alter the trillions of microbes living in the gut. These bacteria, fungi, and viruses are known collectively as the gut microbiome. Research has shown that changes to the gut microbiome may contribute to obesity, diabetes, and cancer.</p>
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<p>Studies have linked diets that are high in red meat to colon cancer, heart disease, stroke, and other diseases. The reasons appear to be complex, and researchers have been working to understand the factors involved. One suspected compound is a carbohydrate (a type of sugar molecule) called N-glycolylneuraminic acid (Neu5Gc).</p>
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||
|
||
<p>People can’t produce Neu5Gc on their own. While most mammals produce the sugar, humans lost a functional copy of the gene needed to produce Neu5Gc several million years ago. However, when people eat things with Neu5Gc like red meat, the Neu5Gc can be incorporated into their cells.</p>
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||
<p>The reason researchers think Neu5Gc may be harmful is that the immune system recognizes it as foreign and makes antibodies against it. This causes inflammation, the body’s natural response to protect against something harmful. This could be why diets rich in red meat diets have been linked to inflammatory diseases like colon cancer and forms of heart disease.</p>
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||
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||
<p>A research team led by Dr. Karsten Zengler of the University of California, San Diego, explored how gut bacteria are affected by a Neu5Gc-rich diet. The research was funded in part by NIH’s National Institute of General Medical Sciences (NIGMS). The study appeared in <em>Nature Microbiology</em> on September 23, 2019.</p>
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||
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||
<p>The team studied mice that were genetically modified so that, like humans, their only source of Neu5Gc was through diet. When the researchers examined fecal samples, they found significant differences in the bacteria from the genetically modified mice compared to unmodified mice. This showed that the inability to produce Neu5Gc significantly affected the mice’s gut microbes.</p>
|
||
|
||
<p>Mice fed a Neu5Gc-rich red meat diet had fewer types of bacteria in their gut microbiomes than those fed a soy-based diet. However, several types of bacteria were more abundant. This included Bacteroides, which are known to be efficient at using sialic acids, the family of sugars that includes Neu5Gc.</p>
|
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||
<p>Using DNA sequencing, the researchers identified increases in Bacteroides enzymes called sialidases in the mice that ate the red meat diet. They suspected that the bacteria use this enzyme to release Neu5Gc from cells. </p>
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||
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||
<p>The team then examined whether sialidases were also increased in the human microbiome when eating red meat. They examined data from a group of unique hunter-gathers who live in a remote region of Tanzania. The Hadza eat meat only during the dry season when hunting is possible. In the wet season, they eat mostly honey and berries. Bacteroides with similar sialidase genes were much more likely to be present in the gut during the dry season.</p>
|
||
|
||
<p>In the lab, the sialidases were able to strip Neu5Gc from store-bought beef and pork sausage when it was cut up and crushed into a suspension. These findings suggest strategies to remove Neu5Gc from red meat using bacterial sialidases and potentially reduce the risk of inflammatory diseases. However, further work needs to be done to understand the role of Neu5Gc in human diseases that have been linked to diets rich in red meats.</p>
|
||
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||
<p>“It’s our hope that this approach could be used as a sort of probiotic or prebiotic to help reduce inflammation and the risk of inflammatory diseases—without giving up steak,” Zengler says.</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/eating-red-meat-daily-triples-heart-disease-related-chemical" target="_top">Eating Red Meat Daily Triples Heart Disease-Related Chemical</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/how-dietary-factors-influence-disease-risk" target="_top">How Dietary Factors Influence Disease risk</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/red-meat-heart-disease-link-involves-gut-microbes" target="_top">Red Meat-Heart Disease Link Involves Gut Microbes</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/vegetarian-diets-linked-lower-mortality" target="_top">Vegetarian Diets Linked to Lower Mortality</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/gut-microbes-diet-interact-affect-obesity" target="_top">Gut Microbes and Diet Interact to Affect Obesity</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/healthy-human-microbiome" target="_top">The Healthy Human Microbiome</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://www.ncbi.nlm.nih.gov/pubmed/31548686">Gut bacteria responding to dietary change encode sialidases that exhibit preference for red meat-associated carbohydrates.</a> Zaramela LS, Martino C, Alisson-Silva F, Rees SD, Diaz SL, Chuzel L, Ganatra MB, Taron CH, Secrest P, Zuñiga C, Huang J, Siegel D, Chang G, Varki A, Zengler K. <em>Nat Microbiol.</em> 2019 Sep 23. doi: 10.1038/s41564-019-0564-9. PMID: 31548686.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Institute of General Medical Sciences; National Science Foundation; University of California San Diego; Science Without Borders.</p>
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NIH Research Matters<br />
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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><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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