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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="2019-01-29T00:00:00-05:00" class="date-display-single">January 29, 2019</span></p><div class='syndicate'><h1>Printed scaffolds promote spinal cord repair in rats</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<ul>
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<li>Researchers used 3D printing technology to create a scaffold that protects implanted stem cells in the spinal cord.</li>
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<li>When tested in rats, the scaffold helped promote the growth of new nerve cells and restore some limb movement after spinal cord injury.</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="Section of 3D-printed scaffold">
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2019/20190129-spine.jpg?itok=hCuhLqRA&timestamp=1548783948 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/2019/20190129-spine.jpg?itok=EllTWjwa&timestamp=1548783948 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/2019/20190129-spine.jpg?itok=4lDLx8Cj&timestamp=1548783948 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/2019/20190129-spine.jpg?itok=nhDSmBKp&timestamp=1548783948 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/2019/20190129-spine.jpg?itok=qJEHNxyg&timestamp=1548783948 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/2019/20190129-spine.jpg?itok=EllTWjwa&timestamp=1548783948" alt="Section of 3D-printed scaffold" title="Section of 3D-printed scaffold" />
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</picture><span class="caption">A 3D printed, two-millimeter implant (slightly larger than the thickness of a penny) used as scaffolding to repair spinal cord injuries in rats. The dots surrounding the H-shaped core are hollow pores through which implanted cells can grow.</span><span class="credit"> Jacob Koffler and Wei Zhu, UC San Diego</span></div>
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</div><p>More than 250,000 people in the United States have experienced a spinal cord injury. In many cases, such an injury can lead to permanent paralysis of one or more limbs. Researchers have been working on ways to regrow nerve cells and restore function in the spine after injury.</p>
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||
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||
<p>Scientists have tried harnessing a type of cell called a neural progenitor cell (NPC). NPCs have the potential to become different types of cells in the nervous system. However, it has proven hard to keep NPCs alive within an injured spine long enough for them to promote substantial repair.</p>
|
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<p>To address this difficulty, researchers led by Drs. Shaochen Chen and Mark Tuszynski from the University of California, San Diego, turned to 3D printing. They designed and printed protective scaffolds for implantation in the spinal cord. The scaffolds contain substances that reduce inflammation and protect growing nerve cells (neurons). They also have tiny channels that encourage new nerve cells to grow along the spine, toward existing neurons on either side of an injury.</p>
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<p>The researchers tested whether the scaffolds could promote substantial nerve cell growth and restore physical functioning in rats with a complete tear in their spinal cords. The study was funded by NIH’s National Institute of Biomedical Imaging and Bioengineering (NIBIB) and Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD). Results appeared online on January 14, 2019, in <em>Nature Medicine</em>.</p>
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||
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||
<p>One month after implantation, rats that received the scaffolds plus NPCs showed reduced inflammation at the site of injury. The researchers also saw a large number of new nerve cells growing in the correct directions through the scaffolds. In contrast, these improvements weren’t seen in rats that received NPCs without the scaffold.</p>
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||
|
||
<p>After six months, rats that received the scaffold and NPCs showed the growth of new neurons that extended out into the rest of the spinal cord. The researchers confirmed that these new neurons and the rest of the nervous system could communicate with each other.</p>
|
||
|
||
<p>Rats that received the scaffold with the NPCs regained some movement in their back leg joints by six months after injury. In contrast, rats that received only NPCs or only empty scaffolds did not show similar functional recovery.</p>
|
||
|
||
<p>The scaffolds were custom printed to match the size and shape of each rat’s spinal injury. In a related proof-of-concept experiment, the researchers also successfully printed scaffolds that matched several complex human spinal cord injuries. These included a partial tear and a knife wound.</p>
|
||
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||
<p>“This marks another key step toward conducting clinical trials to repair spinal cord injury in people,” says coauthor Dr. Jacob Koffler. “The scaffolding provides a stable, physical structure that supports consistent engraftment and survival of neural stem cells.”</p>
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<p>—by Sharon Reynolds</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/regrowing-neurons-across-scarred-spinal-tissue" target="_top">Regrowing Neurons Across Scarred Spinal Tissue</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/spinal-cord-injury-repair-requires-scars" target="_top">Spinal Cord Injury Repair Requires Scars</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/spinal-cord-stimulation-improves-hand-grip-after-cervical-spinal-injury" target="_top">Spinal Cord Stimulation Improves Hand Grip After Cervical Spinal Injury</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/paralyzed-men-gain-movement-without-surgery" target="_top">Paralyzed Men Gain Movement Without Surgery</a></li><li><a href="https://www.nibib.nih.gov/science-education/science-topics/tissue-engineering-and-regenerative-medicine" target="_top">Tissue Engineering and Regenerative Medicine</a></li><li><a href="https://www.nih.gov/rmi" target="_top">Regenerative Medicine Innovation Project</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://www.ncbi.nlm.nih.gov/pubmed/30643285">Biomimetic 3D-printed scaffolds for spinal cord injury repair.</a> Koffler J, Zhu W, Qu X, Platoshyn O, Dulin JN, Brock J, Graham L, Lu P, Sakamoto J, Marsala M, Chen S, Tuszynski MH. <em>Nat Med</em>. 2019 Jan 14. doi: 10.1038/s41591-018-0296-z. [Epub ahead of print]. PMID: 30643285.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Institute of Biomedical Imaging and Bioengineering (NIBIB) and Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD); National Science Foundation; California Institute for Regenerative Medicine; and Dr. Miriam and Sheldon G. Adelson Medical Research Foundation.</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><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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