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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="2020-03-10T00:00:00-04:00" class="date-display-single">March 10, 2020</span></p><div class='syndicate'><h1>New blood test method may predict Alzheimer's disease </h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<ul>
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<li>A new blood testing technique could help researchers detect Alzheimer’s disease prior to onset or in those showing early signs of dementia.</li>
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<li>The approach could be less invasive and costly than current brain imaging and spinal fluid tests, enabling earlier treatments and testing of novel approaches.</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="Older man getting blood drawn">
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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/2020/20200310-tau.jpg?itok=A1mdhV-Z&timestamp=1583847154 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/2020/20200310-tau.jpg?itok=ZR3Wi2UB&timestamp=1583847154 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/2020/20200310-tau.jpg?itok=Fnn0VAjg&timestamp=1583847154 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/2020/20200310-tau.jpg?itok=vZP7UKHM&timestamp=1583847154 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/2020/20200310-tau.jpg?itok=Tu0vh_1a&timestamp=1583847154 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/2020/20200310-tau.jpg?itok=ZR3Wi2UB&timestamp=1583847154" alt="Older man getting blood drawn" title="Older man getting blood drawn" />
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</picture><span class="caption">Researchers are working to develop a blood test for detecting Alzheimer’s disease that would be less invasive and costly than current approaches. </span><span class="credit">Jovanmandic / iStock / Getty Images Plus</span></div>
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</div><p>Alzheimer’s disease is an age-related brain disorder that develops over many years. Toxic changes in the brain slowly destroy memory and thinking skills. Symptoms most often first appear when people are in their mid-60s. The disorder gets worse over time and eventually leads to severe loss of mental function.</p>
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||
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||
<p>The process that destroys the brain involves two proteins called beta-amyloid and tau. Beta-amyloid clumps into plaques, which slowly build up between brain cells. Abnormal tau accumulates inside brain cells, forming tangles.</p>
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||
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||
<p>Researchers have found that PET scans of the brain and lab tests of spinal fluid can reveal disease-related changes, or pathology, twenty years before the onset of symptoms. Although the disorder is not reversable, early treatment may help preserve daily functioning for some time. Early diagnosis would also enable testing of novel drugs and other treatment approaches. However, PET imaging is expensive and involves radioactive agents, and spinal fluid tests are invasive, complex, and time-consuming. Researchers are looking for simpler, more cost-effective tests.</p>
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||
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||
<p>A team led by Dr. Adam Boxer at the University of California, San Francisco investigated whether a new blood testing technique called Simoa could be used to measure the concentrations of tau and predict development of Alzheimer’s disease. The study was funded in part by NIH's National Institute on Aging (NIA), National Institute of Neurological Disorders and Stroke (NINDS), and National Center for Advancing Translational Sciences (NCATS). Results were published online on March 2, 2020, in <em>Nature Medicine</em>.</p>
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<p>The team collected blood samples from more than 400 people. They measured the concentration of ptau181—a modified version of tau that’s been linked with Alzheimer’s disease—in blood plasma, the liquid part of blood. Their analysis showed that the ptau181 in plasma differed between healthy participants and those with Alzheimer's pathology confirmed in autopsies. The test could also differentiate Alzheimer’s pathology from a group of rare neurodegenerative diseases known collectively as frontotemporal lobar degeneration.</p>
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||
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||
<p>The results with the plasma ptau181 test also mirrored results with two established biomarker tests for Alzheimer’s—a spinal fluid ptau181 test and a PET brain scan for beta-amyloid protein.</p>
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||
<p>A research team in Sweden reported similar findings in a second paper published in the same journal issue. Using the same plasma ptau181 test, they were able to differentiate between Alzheimer's and other neurodegenerative diseases nearly as well as they could with a spinal fluid ptau181 test and a PET brain scan for tau protein. In addition, they followed participants for several years and observed that high levels of plasma ptau181 among those who were cognitively normal or had mild cognitive impairment could be used to predict later development of Alzheimer's dementia.</p>
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||
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||
<p>“The considerable time and resources required for screening research participants with PET scans and spinal taps slow the pace of enrollment for Alzheimer’s disease treatment studies,” says NIA Director Dr. Richard J. Hodes. “The development of a blood test would enable us to rapidly screen a much larger and more diverse group of volunteers who wish to enroll in studies.”</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/sleep-deprivation-increases-alzheimers-protein" target="_top">Sleep Deprivation Increases Alzheimer’s Protein</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/mediterranean-diet-may-slow-development-alzheimers-disease" target="_top">Mediterranean Diet May Slow Development of Alzheimer’s Disease</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/alzheimers-protein-may-have-natural-antibiotic-role" target="_top">Alzheimer’s Protein May Have Natural Antibiotic Role</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/study-points-possible-blood-test-memory-decline-alzheimers" target="_top">Study Points to Possible Blood Test For Memory Decline, Alzheimer’s</a></li><li><a href="https://newsinhealth.nih.gov/special-issues/seniors/dealing-dementia" target="_top">Dealing with Dementia: When Thinking and Behavior Decline</a></li><li><a href="https://www.nia.nih.gov/health/alzheimers" target="_top">Alzheimer's Disease & Related Dementias</a></li><li><a href="https://www.ninds.nih.gov/Disorders/All-Disorders/Alzheimers-Disease-Information-Page" target="_top">Alzheimer's Disease Information Page</a></li><li><a href="https://www.nia.nih.gov/health/alzheimers-disease-research-centers" target="_top">Alzheimer's Disease Research Centers</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://www.ncbi.nlm.nih.gov/pubmed/32123386">Diagnostic value of plasma phosphorylated tau181 in Alzheimer's disease and frontotemporal lobar degeneration</a>. Thijssen EH, La Joie R, Wolf A, Strom A, Wang P, Iaccarino L, Bourakova V, Cobigo Y, Heuer H, Spina S, VandeVrede L, Chai X, Proctor NK, Airey DC, Shcherbinin S, Duggan Evans C, Sims JR, Zetterberg H, Blennow K, Karydas AM, Teunissen CE, Kramer JH, Grinberg LT, Seeley WW, Rosen H, Boeve BF, Miller BL, Rabinovici GD, Dage JL, Rojas JC, Boxer AL; Advancing Research and Treatment for Frontotemporal Lobar Degeneration (ARTFL) investigators. <em>Nat Med.</em> 2020 Mar 2. doi: 10.1038/s41591-020-0762-2. [Epub ahead of print] PMID: 32123386.<br />
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||
<br /><a href="https://www.ncbi.nlm.nih.gov/pubmed/32123385">Plasma P-tau181 in Alzheimer's disease: relationship to other biomarkers, differential diagnosis, neuropathology and longitudinal progression to Alzheimer's dementia.</a> Janelidze S, Mattsson N, Palmqvist S, Smith R, Beach TG, Serrano GE, Chai X, Proctor NK, Eichenlaub U, Zetterberg H, Blennow K, Reiman EM, Stomrud E, Dage JL, Hansson O. <em>Nat Med. </em>2020 Mar 2. doi: 10.1038/s41591-020-0755-1. [Epub ahead of print] PMID: 32123385.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Institute on Aging (NIA), National Institute of Neurological Diseases and Stroke (NINDS), and National Center for Advancing Translational Science (NCATS); LEFFTDS and ARTFL Consortium; Larry L. Hillblom Foundation; State of California; Michael J. Fox Foundation; Alzheimer’s Association.</p>
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