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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2012-10-15T00:00:00-04:00" class="date-display-single">October 15, 2012</span></p><div class='syndicate'><h1>Intestinal Mending Depends on Key Protein</h1><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="Microscope image shows intestinal lining with areas of dark green cells">
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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/2012/20121015-intestinal.jpg?itok=zAPmsZ90&timestamp=1435848681 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/2012/20121015-intestinal.jpg?itok=cRANiZYJ&timestamp=1435848681 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/2012/20121015-intestinal.jpg?itok=LzmMGCES&timestamp=1435848681 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/2012/20121015-intestinal.jpg?itok=ju6wj8Zi&timestamp=1435848681 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/2012/20121015-intestinal.jpg?itok=ba-wBhlf&timestamp=1435848681 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/2012/20121015-intestinal.jpg?itok=cRANiZYJ&timestamp=1435848681" alt="Microscope image shows intestinal lining with areas of dark green cells." title="Microscope image shows intestinal lining with areas of dark green cells" />
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</picture><span class="caption">Crypts (dark green) are stem-cell-containing glands that help to regenerate the intestinal lining.</span><span class="credit">Hiroyuki Miyoshi, University of Washington in St. Louis.</span></div>
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</div><p>Scientists identified a protein that’s essential for mending injuries to the intestinal lining in mice. The finding might have implications for understanding and repairing damage to the human intestinal wall, which can be caused by factors including inflammatory bowel disease, infection and irradiation.</p>
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<p>The inner lining of the intestines is one of the most-often renewed surfaces in the human body, replenishing itself every 2 to 4 weeks. Lining replacement depends on stem cells stored within indentations called crypts, which are densely scattered across the intestine’s inner wall. When the lining is injured—for example, by infection or inflammation—crypts can be destroyed. Crypts can reappear, but their mechanism for renewal has been unclear.</p>
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<p>In the new study, scientists led by Dr. Thaddeus S. Stappenbeck at Washington University in St. Louis took a closer look at the rejuvenation of intestinal crypts in mice. The research was funded in part by NIH’s National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) and National Cancer Institute (NCI). Their report appeared on October 5, 2012, in <em>Science.</em></p>
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<p>The scientists suspected that new crypts within wounds somehow arose from existing, nearby crypts. To test this idea, the scientists studied mice that had tiny injuries to the lining of the large intestine. The mice had initially lost up to about 300 crypts in the wounded areas. Within 4 days, the scientists found, a thin layer of slow-growing epithelial cells had emerged from nearby crypts and spread over the injured surface. Within 4 more days, an array of channels containing rapidly dividing stem cells had extended from the crypts into the wounded areas. The channels developed little cavities that eventually formed new crypts.</p>
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<p>The researchers next wanted to identify the factors driving new crypt formation. They noted that cells adjacent to budding wound channels expressed high levels of <em>Wnt</em> genes. Wnt proteins are signaling molecules known to aid communication between cells. These proteins have been linked to embryo development, tissue regeneration and cancer. Wnt signaling is also known to play a role in intestinal development and to help control intestinal stem cells.</p>
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<p>A closer analysis showed higher expression of the signaling molecule Wnt5a by certain cells in the wound bed. Wnt5a-producing cells, the researchers found, migrate from the outer surface of the intestine and collect near the wound. Further experiments showed that the Wnt5a protein slows the growth of stem cells within the wound channels, which in turn triggers the creation of new crypts.</p>
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<p>To verify the role of Wnt5a in crypt formation, the scientists used specialized mice developed by NCI’s Dr. Terry Yamaguchi. The mice had been bred so that the <em>Wnt5a</em> gene could be switched off in specific tissues. When the gut lining was damaged and the gene turned off, wound channels formed as expected, but they did not create new crypts. The results suggest that Wnt5a is essential to crypt formation.</p>
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<p>“Inflammatory bowel disease can destroy huge stretches of the lining, including the crypts,” says Stappenbeck. “It’s important to better understand how the crypts are replaced.” The scientists note that their findings might also be relevant to other Wnt-related processes, including hair follicle formation and cancer development.</p>
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<p>—by Vicki Contie</p>
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</div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="http://digestive.niddk.nih.gov/ddiseases/topics/IBD.aspx" target="_top">Inflammatory Bowel Disease</a></li><li><a href="http://www.nih.gov/researchmatters/may2007/05212007hair.htm" target="_top">Mice Regenerate Hair Follicles</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="http://www.ncbi.nlm.nih.gov/pubmed/22956684" target="_blank."> Science.</a> 2012 Oct 5;338(6103):108-13. doi: 10.1126/science.1223821. Epub 2012 Sep 6. PMID 22956684.</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>
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<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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<p><strong>Editor:</strong> Harrison Wein, 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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