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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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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2021-11-02T00:00:00-04:00" class="date-display-single">November 2, 2021</span></p><div class='syndicate'><h1>A targeted antibiotic for treating Lyme disease</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<ul>
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<li>Researchers found that a neglected antibiotic called hygromycin A selectively kills the bacteria that cause Lyme disease.</li>
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<li>The antibiotic was able to treat Lyme disease in mice without disrupting the microbiome.</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="Photograph of a mouse eating a piece of bait">
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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/2021/20211002-lyme.jpg?itok=DzTpovOx&timestamp=1635862157 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/2021/20211002-lyme.jpg?itok=fnkZDJLy&timestamp=1635862157 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/2021/20211002-lyme.jpg?itok=xXS8horg&timestamp=1635862157 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/2021/20211002-lyme.jpg?itok=ac5AVNyi&timestamp=1635862157 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/2021/20211002-lyme.jpg?itok=8euzR0l0&timestamp=1635862157 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/2021/20211002-lyme.jpg?itok=fnkZDJLy&timestamp=1635862157" alt="Photograph of a mouse eating a piece of bait" title="Photograph of a mouse eating a piece of bait" />
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</picture><span class="caption">In addition to being a potential therapeutic candidate for Lyme disease, hygromycin A could be used to lace mouse baits, shown here, to clear the disease from wild mice. </span><span class="credit">Leimer et al, Cell</span></div>
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</div><p>Lyme disease cases are becoming more frequent and widespread. Currently, it affects almost half a million people nationwide each year.</p>
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<p>Lyme disease is caused by a bacterium, <em>Borelliella burgdorferi</em>, that is transmitted by tick bites. Treatment entails the use of broad-spectrum antibiotics, which have considerable drawbacks. These drugs kill not only <em>B. burgdorferi</em>, but a wide range of other bacteria as well. As a result, they can damage the patient’s gut microbiome and select for resistance in non-target bacteria.</p>
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||
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||
<p>A team of researchers led by Dr. Kim Lewis at Northeastern University wanted to find an antibiotic that would kill <em>B. burgdorferi</em> while leaving other bacterial species alone. The results of their search appeared in <em>Cell</em> on October 14, 2021. NIH’s National Institute of Allergy and Infectious Diseases (NIAID) supported the study.</p>
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||
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||
<p>The research team suspected that compounds that selectively kill <em>B. burgdorferi </em>might already exist in nature. Many broad-spectrum antibiotics in use were discovered in soil-dwelling bacteria. The researchers thought these bacteria might also make an antibiotic specific to <em>B. burgdorferi.</em> To find out, they screened extracts from more than 450 soil bacteria. They found one that was potent at killing <em>B. burgdorferi</em> but not another type of bacteria that was used as a control.</p>
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||
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||
<p>The researchers purified and identified a compound from this extract that acted against <em>B. burgdorferi</em>. It turned out to be hygromycin A, an antibiotic discovered in 1953. Previous research on hygromycin A was abandoned due to its weak activity against most bacteria.</p>
|
||
|
||
<p>The team confirmed that hygromycin A did not kill most bacteria, including many beneficial gut microbes. But it did kill <em>B. burgdorferi</em> and other bacteria in the same class very effectively.</p>
|
||
|
||
<p>Hygromycin A works by blocking the cellular machinery that makes proteins. This machinery is highly conserved across all bacteria. So, the researchers were puzzled about why hygromycin A only worked on one class of bacteria. Further investigation showed that <em>B. burgdorferi</em> took up the drug much more easily than other bacteria. <em>B. burgdorferi</em> use a specific protein on their surfaces to take in certain essential nutrients from the environment. This protein allowed hygromycin A to enter the cell.</p>
|
||
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||
<p>Hygromycin A had no toxic effects on cultured human cells. In a mouse model of Lyme disease, 5 days of hygromycin A treatment cleared the infection as well as broad-spectrum antibiotics did. But unlike the broad-spectrum antibiotics, hygromycin A didn't disrupt the gut microbiome. It worked when injected under the skin or when the mice ate hygromycin A-laced baits. </p>
|
||
|
||
<p>Hygromycin A could make an attractive therapeutic candidate. Hygromycin A baits could also be used to clear the disease from wild mice. Since mice are the principal hosts of <em>B. burgdorferi</em>, this strategy might help to eradicate the disease at its source.</p>
|
||
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||
<p>“I hope that it will continue moving forward in development and will become the first targeted therapeutic to treat Lyme disease,” Lewis says. However, more study will be needed before the compound can enter clinical trials.</p>
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<p>—by Brian Doctrow, Ph.D.</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/genome-reveals-insights-into-tick-spreads-lyme-disease" target="_top">Genome Reveals Insights into Tick that Spreads Lyme Disease</a></li><li><a href="https://newsinhealth.nih.gov/2021/07/protect-yourself-lyme-disease" target="_top">Protect Yourself from Lyme Disease</a></li><li><a href="https://newsinhealth.nih.gov/2014/05/tick-talk" target="_top">Tick Talk</a></li><li><a href="https://www.niaid.nih.gov/diseases-conditions/lyme-disease" target="_top">Lyme Disease</a></li><li><a href="https://www.niaid.nih.gov/diseases-conditions/tickborne-diseases" target="_top">Tickborne Diseases</a></li><li><a href="https://www.cdc.gov/lyme/index.html" target="_top">Lyme Disease (CDC)</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://pubmed.ncbi.nlm.nih.gov/34619078/">A selective antibiotic for Lyme disease.</a> Leimer N, Wu X, Imai Y, Morrissette M, Pitt N, Favre-Godal Q, Iinishi A, Jain S, Caboni M, Leus IV, Bonifay V, Niles S, Bargabos R, Ghiglieri M, Corsetti R, Krumpoch M, Fox G, Son S, Klepacki D, Polikanov YS, Freliech CA, McCarthy JE, Edmondson DG, Norris SJ, D'Onofrio A, Hu LT, Zgurskaya HI, Lewis K. <em>Cell.</em> 2021 Oct 14;184(21):5405-5418.e16. doi: 10.1016/j.cell.2021.09.011. Epb 2021 Oct 6. PMID: 34619078.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Institute of Allergy and Infectious Diseases (NIAID); Steven & Alexandra Cohen Foundation; Global Lyme Alliance.</p>
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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><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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