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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/news-releases">News Releases</a></div> <div class="l-region l-region--section-header">
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<p class="publishdate"><span class="tag-term">News Release</span></p><p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2017-06-13T11:00:00-04:00" class="date-display-single">Tuesday, June 13, 2017</span></p><h1>Researchers aim to repurpose former experimental cancer therapy to treat muscular dystrophy </h1><p class="subtitle">
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Duchenne muscular dystrophy is caused by a faulty gene that leads to progressive muscle weakness.</p><div class="featured-media"><div class="ds-1col file file-image file-image-jpeg view-mode-featured_media clearfix">
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<source srcset="https://www.nih.gov/sites/default/files/styles/featured_media_breakpoint-large/public/news-events/news-releases/2017/20170613-diaphragm-muscle.jpg?itok=ZwX2UvWz&timestamp=1497360221 1x" media="screen and (min-width: 960px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/featured_media_breakpoint-medium/public/news-events/news-releases/2017/20170613-diaphragm-muscle.jpg?itok=fUvMuja0&timestamp=1497360221 1x" media="screen and (min-width: 800px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/featured_media_breakpoint-medium-small/public/news-events/news-releases/2017/20170613-diaphragm-muscle.jpg?itok=RbdC1WVK&timestamp=1497360221 1x" media="screen and (min-width: 600px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/featured_media_breakpoint-small/public/news-events/news-releases/2017/20170613-diaphragm-muscle.jpg?itok=91DZti5m&timestamp=1497360221 1x" media="screen and (min-width: 480px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/featured_media__breakpoint-tiny_/public/news-events/news-releases/2017/20170613-diaphragm-muscle.jpg?itok=YRoyBtdJ&timestamp=1497360221 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/featured_media_breakpoint-medium/public/news-events/news-releases/2017/20170613-diaphragm-muscle.jpg?itok=fUvMuja0&timestamp=1497360221" alt="Diaphragm muscle" title="Diaphragm muscle" />
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</picture><span class="caption">Diaphragm muscle from SU9516 treated dystrophin deficient mouse showing nuclei (blue), myofibers (outlined in red) and regenerating muscle fibers (green).</span><span class="credit">Burkin lab at the University of Nevada, Reno School of Medicine</span></div>
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</div><p>Researchers at the National Institutes of Health’s National Center for Advancing Translational Sciences (NCATS) and the University of Nevada, Reno School of Medicine (UNR Med) have demonstrated that a drug originally targeted unsuccessfully to treat cancer may have new life as a potential treatment for Duchenne muscular dystrophy (DMD).</p>
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||
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||
<p>The candidate drug, SU9516, represents a different kind of approach for treating DMD, a degenerative muscle disease that usually begins in childhood and has no known cure. It is caused by a faulty gene that leads to progressive muscle weakness, with death often occurring around age 25. Rather than trying to fix or replace the broken gene, SU9516 ramps up the muscle repair process, helping reinforce muscle structure.</p>
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||
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||
<p>NCATS Chemical Genomics Center Acting Branch Chief Juan Marugan, Ph.D., and UNR Med Professor of Pharmacology Dean Burkin, Ph.D., led a team that screened more than 350,000 compounds to find SU9516, which had been previously developed as a treatment for leukemia. The research demonstrated that this compound improved muscle function in both laboratory and animal DMD models. The results, published recently in <em>Molecular Therapy</em>, may provide a promising approach against the disorder and other muscle-wasting conditions.</p>
|
||
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||
<p>Those with DMD lack dystrophin, a protein akin to a molecular shock-absorber that helps keep muscle cells intact. Without dystrophin, muscles are fragile and easily injured. Individuals lose muscle strength and the ability to repair damaged muscle tissue. Most die from heart or respiratory problems.</p>
|
||
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||
<p>“Our findings open the door to develop new drug treatments for DMD,” Marugan said.</p>
|
||
|
||
<p>In earlier research, Burkin, who is senior author of the current study, and his co-workers showed that boosting the levels of a cell structural protein, α7β1 integrin, in affected muscle cells could alleviate DMD symptoms in a mouse model. In addition, increased amounts of the protein slowed the disease’s progress.</p>
|
||
|
||
<p>Burkin and his UNR Med colleagues collaborated with NCATS researchers, including co-team leaders Marc Ferrer, Ph.D., and Noel Southall, Ph.D., to screen a large collection of compounds for molecules that could increase α7β1 integrin production in mouse muscle cells grown in the laboratory. The screen revealed that SU9516 raised integrin production and promoted the formation of muscle cells and fibers from DMD muscle stem cells, another important indication of its potential as a drug.</p>
|
||
|
||
<p>In a series of pre-clinical experiments, the researchers showed that SU9516 increased the production of α7β1 integrin in human and mouse DMD muscle cells. Subsequent tests found SU9516 improved muscle function and slowed indicators of disease progression.</p>
|
||
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||
<p>Burkin suggests that such a drug could be used alone, or in combination, with other therapies yet to be developed. There might be wide ranging applications to other muscle-damaging conditions, like cachexia, a wasting syndrome characterized by weight loss and muscle atrophy that is often seen in the late stages of cancers, and the effects of aging and injury, he noted.</p>
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||
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<p>“Integrin stabilizes muscle structure, and helps stimulate muscle repair and regeneration,” Burkin said. “If we can artificially increase its production with drugs, we think it can help protect muscle cells from damage.”</p>
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||
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||
<p>The NCATS-UNR Med team plans to work with medicinal chemists to make the molecule more specific for DMD, while also removing the toxic anticancer components, creating a safer version with a goal of future testing in patients. </p>
|
||
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||
<p>The work was supported by NCATS through its intramural research program, the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) grants R01AR053697, R01AR064338 and R41AR067014, the National Institute of Neurological Disorders and Stroke (NINDS) grant NS058429, Cure CMD and Struggle Against Muscular Dystrophy. </p>
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<p>The mission of the NIAMS, a part of the U.S. Department of Health and Human Services' National Institutes of Health, is to support research into the causes, treatment and prevention of arthritis and musculoskeletal and skin diseases; the training of basic and clinical scientists to carry out this research; and the dissemination of information on research progress in these diseases. For more information about the NIAMS, call the information clearinghouse at (301) 495-4484 or (877) 22-NIAMS (free call) or visit the NIAMS website at <a href="https://www.niams.nih.gov">https://www.niams.nih.gov</a>.</p>
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<p><strong>About the National Center for Advancing Translational Sciences (NCATS):</strong> NCATS conducts and supports research on the science and operation of translation — the process by which interventions to improve health are developed and implemented — to allow more treatments to get to more patients more quickly. For more information about how NCATS is improving health through smarter science, visit <a href="https://ncats.nih.gov/">https://ncats.nih.gov</a>.</p>
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