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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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<div about="/news-events/nih-research-matters/medical-glue-inspired-sticky-slug-mucus" typeof="sioc:Item foaf:Document" class="ds-1col node node--nih-research-matters view-mode-full node--full node--nih-research-matters--full clearfix">
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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2017-08-08T00:00:00-04:00" class="date-display-single">August 8, 2017</span></p><div class='syndicate'><h1>Medical glue inspired by sticky slug mucus</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<ul>
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<li>Scientists designed a family of strong and stretchy medical glues that can be used even on wet surfaces.</li>
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<li>The findings could lead to the development of a new generation of medical adhesives. </li>
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</ul>
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</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="Dusky Arion slug">
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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/2017/20170808-slug.jpg?itok=C_ERV9RO&timestamp=1502122954 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/2017/20170808-slug.jpg?itok=g0lJRic4&timestamp=1502122954 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/2017/20170808-slug.jpg?itok=1Y7MOkVA&timestamp=1502122954 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/2017/20170808-slug.jpg?itok=KxjKRFdr&timestamp=1502122954 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/2017/20170808-slug.jpg?itok=exKYRohk&timestamp=1502122954 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/2017/20170808-slug.jpg?itok=g0lJRic4&timestamp=1502122954" alt="Dusky Arion slug" title="Dusky Arion slug" />
|
||
</picture><span class="caption">The Dusky Arion slug, shown here, adds certain proteins to its mucus to make a glue. </span><span class="credit">H. Krisp, [CC BY 3.0 (http://creativecommons.org/licenses/by/3.0)], via Wikimedia Commons</span></div>
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||
</div><p>The slug known as Dusky Arion (<em>Arion subfuscus</em>) coats itself with mucus to keep moist. It can add certain proteins to its mucus to make a glue. With this glue, the slug can attach so strongly to a surface that it can’t be carried off by a predator.</p>
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||
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||
<p>Inspired by the Dusky Arion, a research team led by Dr. David J. Mooney at Harvard University created a family of medical glues that could be sticky, strong, stretchy, and nontoxic. The study was supported in part by NIH’s National Institute of Dental and Craniofacial Research (NIDCR). Results were published on July 28, 2017, in <em>Science</em>.</p>
|
||
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||
<p>The research team designed a glue that has two layers. One layer is a sticky surface that contains a polymer. Like the proteins in the slug’s glue, the polymers create strong chemical bonds to the underlying tissue. The other layer is a stretchable, strong hydrogel, such as alginate-polyacrylamide. The team made a family of such two-layer glues by combining different polymers.</p>
|
||
|
||
<p>The researchers tested the strength of these glues in many scenarios. The new glues adhered strongly to the surfaces of tissues from a pig, including skin, cartilage, heart, and liver. The team found that the adhesion could be as strong as natural cartilage binding to bone. The glues adhered so well because they are stretchy rather than brittle like currently available medical adhesives, such as cyanoacrylate. This flexibility allows them to spread out the forces that normally cause adhesives to fail.</p>
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<picture title="Bioinspired adhesives" class="media-element file-floated-media">
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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/2017/20170808-slug-glue.jpg?itok=9zASgNQQ&timestamp=1502194790 1x" media="screen and (min-width: 960px)"></source>
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2017/20170808-slug-glue.jpg?itok=e5_OxXg4&timestamp=1502194790 1x" media="screen and (min-width: 800px)"></source>
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium-small/public/news-events/research-matters/2017/20170808-slug-glue.jpg?itok=fOYe4th2&timestamp=1502194790 1x" media="screen and (min-width: 600px)"></source>
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-small/public/news-events/research-matters/2017/20170808-slug-glue.jpg?itok=p12_puUQ&timestamp=1502194790 1x" media="screen and (min-width: 480px)"></source>
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-tiny/public/news-events/research-matters/2017/20170808-slug-glue.jpg?itok=4eBqdnl6&timestamp=1502194790 1x" media="screen and (min-width: 0)"></source>
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<!--[if IE 9]></video><![endif]-->
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<img class="media-element file-floated-media" src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2017/20170808-slug-glue.jpg?itok=e5_OxXg4&timestamp=1502194790" alt="Bioinspired adhesives" title="Bioinspired adhesives" />
|
||
</picture><span class="caption">A new, flexible adhesive material can stick to biological tissues even when wet, and can be formed into sheets (teal blue) and custom shapes (dark blue). </span><span class="credit">Wyss Institute at Harvard University</span></div>
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</div></div>
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||
<p>The team compared the performance of their family of glues to commercially available medical adhesives. The new glues adhered much more strongly than commercial adhesives. They also adhered more slowly, so that a surgeon would be able to position a seal precisely over tissues before the glue hardened.</p>
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||
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||
<p>Surgeons need adhesives that stick to wet surfaces. To test whether the new glues might be suitable for surgery, the researchers covered pig skin with blood to approximate a real-life surgery. Even in this wet environment, the new glues were sticky. The commercial adhesive didn’t work as well with blood.</p>
|
||
|
||
<p>Surgeons also require adhesives that will adapt to moving tissues, such as a beating heart. When tested with a heart, the team’s glues were stickier than the commercial adhesive. Even when the heart expanded, the seal remained stuck. The researchers also used the glues to seal a hole in the wall of a rat liver.</p>
|
||
|
||
<p>In lab tests, the new family of glues wasn’t toxic to a culture of human cells. When implanted under the skin or on the heart of lab rats, the glues caused less or about the same immune reactions as two commercial adhesives.</p>
|
||
|
||
<p>“The key feature of our material is the combination of a very strong adhesive force and the ability to transfer and dissipate stress, which have historically not been integrated into a single adhesive,” Mooney says. The new family of adhesive materials has the potential to be developed into a variety of medical products, such as an adhesive to glue medical devices to tissues, a stretchy patch to apply to tissue, or an injectable solution to repair deep injuries.</p>
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||
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||
<p>—by Geri Piazza </p>
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</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/nature-inspired-surgical-glue-mends-hearts" target="_top">Nature-Inspired Surgical Glue Mends Hearts</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/new-glue-marries-sticky-properties-geckos-mussels" target="_top">New “Glue” Marries Sticky Properties of Geckos and Mussels</a></li><li><a href="https://newsinhealth.nih.gov/issue/feb2015/feature1" target="_top">Fixing Flawed Body Parts: Engineering New Tissues and Organs</a></li><li><a href="https://directorsblog.nih.gov/2013/05/02/spiny-worm-inspires-next-gen-band-aid/" target="_top">Spiny Worm Inspires Next-Gen Band-Aid</a></li><li><a href="https://publications.nigms.nih.gov/insidelifescience/medical-materials.html" target="_top">Porcupine Quills, Gecko Feet and Spider Webs Inspire Medical Materials</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://www.ncbi.nlm.nih.gov/pubmed/28751604">Tough adhesives for diverse wet surfaces</a>. Li J, Celiz AD, Yang J, Yang Q, Wamala I, Whyte W, Seo BR, Vasilyev NV, Vlassak JJ, Suo Z, Mooney DJ. <em>Science</em>. 2017 Jul 28;357(6349):378-381. doi: 10.1126/science.aah6362. PMID: 28751604.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Institute of Dental and Craniofacial Research (NIDCR); European Commission; Science Foundation Ireland; Tsinghua University; National Science Foundation; and Harvard University Materials Research Science and Engineering Center.</p>
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