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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="2013-04-29T00:00:00-04:00" class="date-display-single">April 29, 2013</span></p><div class='syndicate'><h1>Lab-Grown Kidneys Function in Rats</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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<!--[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/2013/20130429-kidneys.jpg?itok=bz501DRd&timestamp=1431632115 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/2013/20130429-kidneys.jpg?itok=1NkZQNX-&timestamp=1431632115 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/2013/20130429-kidneys.jpg?itok=3VWx_v3a&timestamp=1431632115 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/2013/20130429-kidneys.jpg?itok=8tVi8WWH&timestamp=1431632115 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/2013/20130429-kidneys.jpg?itok=e8W7bNxT&timestamp=1431632115 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/2013/20130429-kidneys.jpg?itok=1NkZQNX-&timestamp=1431632115" alt="Rat kidney" title="Rat kidney" />
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</picture><span class="caption">A decellularized rat kidney in a bioreactor after reseeding with endothelial cells.</span><span class="credit">Massachusetts General Hospital Center for Regenerative Medicine</span></div>
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</div><p>Scientists have created artificial kidneys that can filter blood and produce urine when transplanted into rats. With further development, this approach could help the many patients who await organ transplants because their own kidneys no longer work.</p>
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<p>End-stage kidney disease, or renal failure, affects nearly 1 million people nationwide. Left untreated, it causes the body to retain excess water and waste products. Renal failure can be reversed by kidney transplants from well-matched donors. But about 1 in 5 recipients has problems with organ rejection within 5 years, and there aren’t enough donated kidneys to meet demand. About 100,000 people in the U.S. are now on the waiting list for a kidney transplant.</p>
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<p>To provide new options for these patients, researchers have been exploring techniques for creating artificial kidneys and other organs. One promising approach uses detergents to delicately strip cells from organs, leaving behind a protein-based scaffold that wouldn’t be rejected by a recipient’s immune system. These decellularized organs are then seeded, or repopulated, with living cells. The method has been used by different research teams in efforts to create nonhuman bioengineered hearts, livers and lungs.</p>
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<p>Dr. Harald C. Ott and his colleagues at Massachusetts General Hospital created bioengineered kidneys by using a decellularization technology Ott had previously developed. Their research was funded in part by an NIH Director’s New Innovator Award and by NIH’s National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). The results were reported in the April 14, 2013, online edition of<em> Nature Medicine.</em></p>
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<p>The scientists first tested their approach by decellularizing kidneys from rats, pigs and human cadavers. They confirmed that the fine architecture of the kidneys remained intact, including the framework for tiny blood vessels and filtering systems.</p>
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<p>To regenerate functional rat kidneys, the researchers mounted the decellularized organs within vacuum chambers to help draw new cells into the proper locations. Blood vessel linings were restored by delivering endothelial cells via the renal artery, which normally carries blood to the kidney. Remaining kidney tissues were populated by delivering newborn rat kidney cells via the ureter, which normally carries away urine.</p>
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<p>The seeded scaffolds were then grown for several days in a nutrient-rich bioreactor. The reactor chamber mimicked conditions inside the body. The scientists showed that the resulting organs could perform kidney-like functions. The organs filtered fluids and generated urine in culture. When transplanted into rats, the artificial kidneys produced urine and successfully filtered out and reabsorbed certain molecules. But the regenerated kidneys didn’t work as well as normal kidney transplants.</p>
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<p>Ott says the technique might be further improved by refining the cell types used for seeding and by changing the culture conditions. “Based on this initial proof of principle, we hope that bioengineered kidneys will someday be able to fully replace kidney function just as donor kidneys do,” says Ott. He and his colleagues are now developing techniques for creating human-sized organs.</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="https://www.nih.gov/news-events/nih-research-matters/progress-toward-artificial-liver-transplant" target="_top">Progress Toward an Artificial Liver Transplant</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/making-lung-replacement" target="_top">Making a Lung Replacement</a></li><li><a href="http://kidney.niddk.nih.gov/kudiseases/pubs/yourkidneys/" target="_top">The Kidneys and How They Work</a></li><li><a href="https://newsinhealth.nih.gov/issue/mar2013/feature1" target="_top">Keep Your Kidneys Healthy</a></li><li><a href="https://newsinhealth.nih.gov/issue/Mar2011/Feature1" target="_top">Organ Donation: Pass It On</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="http://www.ncbi.nlm.nih.gov/pubmed/23584091">Nat Med.</a> 2013 Apr 14. doi: 10.1038/nm.3154. [Epub ahead of print]. PMID: 23584091.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH Director's New Innovator Award, NIH’s National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) and the American Heart Association.</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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