{"id":121478,"date":"2024-11-03T05:52:45","date_gmt":"2024-11-02T22:52:45","guid":{"rendered":"https:\/\/hotvideos24.online\/?p=121478"},"modified":"2024-11-03T05:52:45","modified_gmt":"2024-11-02T22:52:45","slug":"new-blood-test-shows-promise-for-early-parkinsons-detection","status":"publish","type":"post","link":"https:\/\/hotvideos24.online\/?p=121478","title":{"rendered":"New Blood Test Shows Promise for Early Parkinson\u2019s Detection"},"content":{"rendered":"<p> <script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3711241968723425\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-layout-key=\"-fb+5w+4e-db+86\"\r\n     data-ad-client=\"ca-pub-3711241968723425\"\r\n     data-ad-slot=\"7910942971\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><br \/>\n<\/p>\n<div>\n<p><strong>Summary: <\/strong>Researchers have developed a method to analyze extracellular vesicles (EVs) in blood for early detection of Parkinson\u2019s disease (PD). By isolating EVs and assessing their contents, the team identified a protein called phosphorylated \u03b1-synuclein that appears in elevated levels in PD patients.<\/p>\n<p>This discovery could allow for earlier diagnosis, as these protein changes are detectable before clinical symptoms appear. The approach uses an ultra-sensitive assay that can distinguish disease markers within EVs from those free in plasma.<\/p>\n<p>If successful, this technique could enable non-invasive, blood-based diagnostics for PD and other neurodegenerative disorders. Ongoing work will determine if the test can reliably differentiate PD from other conditions.<\/p>\n<p><strong>Key Facts:<\/strong><\/p>\n<ul class=\"wp-block-list\">\n<li>Elevated phosphorylated \u03b1-synuclein levels in EVs correlate with PD progression.<\/li>\n<li>Extracellular vesicles protect protein biomarkers, helping preserve disease indicators.<\/li>\n<li>This blood-based diagnostic technique may enable earlier, non-invasive PD detection.<\/li>\n<\/ul>\n<p><strong>Source: <\/strong>Wyss Institute<\/p>\n<p><strong>Brain disorders like Parkinson\u2019s (PD) or Alzheimer\u2019s Disease (AD) start to develop in patients much earlier than when their first clinical symptoms appear. <\/strong><\/p>\n<p>Treating patients at these early stages could slow or even stop their disease, but there is currently no way to diagnose brain disorders at those pre-symptomatic stages.<\/p>\n<p> Thus far, the specific brain lesions caused by PD, for example, can only be detected by analyzing brain biopsies, which can only be obtained posthumously.\u00a0<\/p>\n<figure class=\"wp-block-image size-full\"><picture fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-105857\"><source type=\"image\/webp\" srcset=\"https:\/\/neurosciencenews.com\/files\/2024\/11\/blood-tests-parkinsons-neuroscience.jpg.webp 1200w, https:\/\/neurosciencenews.com\/files\/2024\/11\/blood-tests-parkinsons-neuroscience-300x200.jpg.webp 300w, https:\/\/neurosciencenews.com\/files\/2024\/11\/blood-tests-parkinsons-neuroscience-770x513.jpg.webp 770w, https:\/\/neurosciencenews.com\/files\/2024\/11\/blood-tests-parkinsons-neuroscience-1155x770.jpg.webp 1155w, https:\/\/neurosciencenews.com\/files\/2024\/11\/blood-tests-parkinsons-neuroscience-370x247.jpg.webp 370w, https:\/\/neurosciencenews.com\/files\/2024\/11\/blood-tests-parkinsons-neuroscience-293x195.jpg.webp 293w, https:\/\/neurosciencenews.com\/files\/2024\/11\/blood-tests-parkinsons-neuroscience-150x100.jpg.webp 150w\" sizes=\"(max-width: 1200px) 100vw, 1200px\"\/><img fetchpriority=\"high\" decoding=\"async\" width=\"1200\" height=\"800\" src=\"https:\/\/neurosciencenews.com\/files\/2024\/11\/blood-tests-parkinsons-neuroscience.jpg\" alt=\"This shows blood vials.\" srcset=\"https:\/\/neurosciencenews.com\/files\/2024\/11\/blood-tests-parkinsons-neuroscience.jpg 1200w, https:\/\/neurosciencenews.com\/files\/2024\/11\/blood-tests-parkinsons-neuroscience-300x200.jpg 300w, https:\/\/neurosciencenews.com\/files\/2024\/11\/blood-tests-parkinsons-neuroscience-770x513.jpg 770w, https:\/\/neurosciencenews.com\/files\/2024\/11\/blood-tests-parkinsons-neuroscience-1155x770.jpg 1155w, https:\/\/neurosciencenews.com\/files\/2024\/11\/blood-tests-parkinsons-neuroscience-370x247.jpg 370w, https:\/\/neurosciencenews.com\/files\/2024\/11\/blood-tests-parkinsons-neuroscience-293x195.jpg 293w, https:\/\/neurosciencenews.com\/files\/2024\/11\/blood-tests-parkinsons-neuroscience-150x100.jpg 150w\" sizes=\"(max-width: 1200px) 100vw, 1200px\"\/> <\/picture><figcaption class=\"wp-element-caption\">Analyzing a cohort of patient samples, they could detect an enrichment of the pathological \u237a-synuclein protein inside EVs relative to total plasma. Credit: Neuroscience News<\/figcaption><\/figure>\n<p>To overcome this critical bottleneck, researchers have been pursuing the new concept of \u201cliquid biopsies,\u201d which involves the easy extraction of blood or other body fluids using non-invasive procedures, and analyzing them for molecules originating from brain and other solid tissues.<\/p>\n<p>A particularly promising target in body fluids are \u201cextracellular vesicles\u201d (EVs), tiny membrane-bound sacs released by brain and other cells into their surrounding fluids.<\/p>\n<p>These sacs contain a variety of molecules that can be unique to the cells types that produce them, such as the brain, and thus could also carry protected biomarkers for the early onset of Parkinson\u2019s and other brain diseases.\u00a0<\/p>\n<p>However, despite recent progress, EV experts haven\u2019t been able to tackle the problem of whether particular biomarker molecules that they measured in isolated EVs are strictly contained inside EVs or non-specifically bound to their surface.<\/p>\n<p>This challenge has actually prevented them from being able to make unambiguous conclusions about cargo molecules in EVs from all types of tissues.<\/p>\n<p>Now, a collaborative team led by\u00a0David Walt, Ph.D. at the Wyss Institute at Harvard University and\u00a0Brigham and Women\u2019s Hospital\u00a0(BWH) in Boston has solved this problem by adding a crucial step to an already validated\u00a0ultra-sensitive protocol.<\/p>\n<p>By enzymatically digesting all surface-bound proteins from a purified EV population, they were able to specifically home in on cargo protected inside of EVs while eliminating unspecific \u201ccontaminations.\u201d<\/p>\n<p>Using their enhanced protocol to measure the PD biomarker\u00a0\u237a-synuclein in blood, for the first time they were able to accurately determine the small fraction of any protein contained within EVs vs how much of it is present free in total blood plasma.\u00a0<\/p>\n<p>Importantly, they integrated this advance with a newly developed ultra-sensitive detection assay for a form of\u00a0\u237a-synuclein that becomes increasingly phosphorylated during the progression of PD and the related condition Lewy Body Dementia.<\/p>\n<p>Analyzing a cohort of patient samples, they could detect an enrichment of the pathological\u00a0\u237a-synuclein protein inside EVs relative to total plasma. The findings are published in\u00a0<em>PNAS<\/em>.<\/p>\n<p>\u201cResearch on EVs in our and other groups over the last few decades has steadily advanced our understanding of their complex biology and molecular composition.<\/p>\n<p>\u201cYet, the isolation of pure tissue-specific EVs from body fluids like blood or the cerebrospinal fluid surrounding the central nervous system, including the brain, and validating and quantifying their true contents with precise measurements still present formidable technical challenges,\u201d said Wyss Core Faculty member Walt.<\/p>\n<p>\u201cOur recent work is providing a solution to help fill this technological gap, and gets us closer to being able to obtain EVs free from contamination in order to use them as rich sources for clinical biomarkers, as we show with the example of phosphorylated\u00a0\u237a-synuclein.\u201d<\/p>\n<p>Walt, who is the faculty lead of the Wyss Institute\u2019s Diagnostic Accelerator, is also the Hansj\u00f6rg Wyss Professor of Biologically Inspired Engineering at Harvard Medical School (HMS), Professor of Pathology at Brigham and Women\u2019s Hospital, and a Howard Hughes Medical Institute Professor.<\/p>\n<p><strong>From blood to EVs to biomarkers to diagnosis<\/strong><\/p>\n<p>Especially motivated by the diagnostic promise of EVs for the early diagnosis of PD, AD, and other brain disorders, the Walt group has been systematically filling vital pieces into this technical jigsaw puzzle.<\/p>\n<p>With philanthropic support from\u00a0Good Ventures, the\u00a0Chan Zuckerberg Initiative, and more recently the\u00a0Michael J. Fox Foundation, they previously developed a\u00a0technical framework\u00a0for quantifying EVs and used this quantification to compare EV isolation methods from body fluids.<\/p>\n<p>Their methodology combines a separation technique known as size exclusion chromatography (SEC) to recover most EVs from biofluids with ultra-sensitive \u201cSimoa assays\u201d that allowed them to count single protein molecules associated with EVs that they captured and visualized with specific antibodies.<\/p>\n<p>By now, the team has engineered Simoa assays for a variety of EV-specific biomarkers and, importantly, excluded a widely used candidate surface protein, L1CAM, as a target to isolate brain-specific EVs, which provided the field with an important\u00a0course correction.<\/p>\n<p>\u201cTo answer the conceptually simple but technically challenging question of what percentage of a given protein (such as\u00a0\u237a-synuclein) present in plasma is inside of EVs relative to outside, we used SEC isolation methods that we previously developed to isolate most EVs from plasma together with an optimized \u2018proteinase protection assay\u2019 where\u00a0we use an enzyme to gently but efficiently chew all proteins off the surface of isolated EVs, while leaving the membrane-enclosed EV interior intact.\u201d said co-first author\u00a0Dima Ter-Ovanesyan, Ph.D., who is a Senior Scientist at the Wyss Institute and spearheads the EV project with co-first author and Postdoctoral Fellow\u00a0Tal Gilboa, Ph.D.<\/p>\n<p>Also, to measure\u00a0\u237a-synuclein at very low levels, Gilboa, together with Postdoctoral Fellow\u00a0Gina Wang, Ph.D. and Wyss Research Assistant\u00a0Sara Whiteman\u00a0in the Walt lab, developed a Simoa assay for\u00a0\u237a-synuclein that is much more sensitive that any previously reported assay.<\/p>\n<p>Using this assay in their protocol, the team was able to determine that most of the\u00a0\u237a-synuclein in EVs isolated using their SEC protocol was protected and that this amount presented less than 5% of total blood plasma\u00a0\u237a-synuclein.<\/p>\n<p>Understanding this amount is particularly important for the eventual goal of measuring\u00a0\u237a-synuclein in neuron-derived EVs as EVs that originate from a specific tissue like the brain are expected to be rare relative to EVs from blood cells, where\u00a0\u237a-synuclein is also expressed.\u00a0<\/p>\n<p>Importantly, in addition to their ultra-sensitive Simoa assay that enabled them to detect the normal unmodified\u00a0\u237a-synuclein protein, they also developed an assay that is able to detect\u00a0\u237a-synuclein that becomes phosphorylated at a specific site (pSer129) in the course of PD progression.<\/p>\n<p>\u201cWhen we applied our advanced methodology to a cohort of blood samples obtained from patients with PD and Lewy Body Dementia as well as healthy control donors, we found that the ratio of phosphorylated\u00a0\u237a-synuclein relative to total\u00a0\u237a-synuclein was two to three-fold higher inside EVs relative to outside of EVs,\u201d said Gilboa.<\/p>\n<p>\u201cThis was extremely exciting because it suggests that EVs may protect the phosphorylation state of proteins from circulating phosphatases that would otherwise erase this highly informative mark.\u201d<\/p>\n<p>The team is now further exploring whether these assays could be used to differentiate PD patients from people without the disease.\u00a0\u00a0<\/p>\n<p>\u201cThe work by David Walt\u2019s team presents a technological tour-de-force that brings us closer and closer to a next-generation diagnostic platform with extraordinary potential. At this point, we are not far from using these extremely rich and telling cell-derived vesicles as a window to peak into the brains of patients without requiring surgery,\u201d said Wyss Founding Director\u00a0Donald Ingber,\u00a0M.D., Ph.D., who is also the\u00a0Judah Folkman Professor of Vascular Biology\u00a0at HMS and Boston Children\u2019s Hospital and the\u00a0Hansj\u00f6rg Wyss Professor of Biologically Inspired Engineering\u00a0at Harvard\u2019s John A. Paulson School of Engineering and Applied Sciences.<\/p>\n<p>Additional authors of the paper are George Church, Ph.D., a Wyss Core Faculty member and the Robert Winthrop Professor of Genetics at HMS and Alice Chen-Plotkin, M.D., the Parker Family Professor of Neurology at the Perelman School of Medicine at the University of Pennsylvania, Philadelphia, who have both collaborated with Walt\u2019s group since the inception of the EV project, as well as George Kannarkat.<\/p>\n<p><strong>Funding: <\/strong>The work was supported by grants from the Michael J. Fox Foundation (Grant #2021A017224), Chan Zuckerberg Initiative NeuroDegeneration Challenge Network, and Good Ventures. Gilboa is an awardee of the Weizmann Institute of Science Women\u2019s Postdoctoral Career Development Award.<\/p>\n<h2 class=\"wp-block-heading\">About this Parkinson\u2019s disease research news<\/h2>\n<p class=\"has-background\" style=\"background-color:#ffffe8\"><strong>Author: <\/strong><a href=\"http:\/\/neurosciencenews.com\/cdn-cgi\/l\/email-protection#b3f1d6ddd9d2dedadd9df1dcd6c7c7ddd6c1f3c4cac0c09ddbd2c1c5d2c1d79dd6d7c6\" target=\"_blank\" rel=\"noreferrer noopener\">Benjamin Boettner<\/a><br \/><strong>Source: <\/strong><a href=\"https:\/\/wyss.harvard.edu\" target=\"_blank\" rel=\"noreferrer noopener\">Wyss Institute<\/a><br \/><strong>Contact: <\/strong>Benjamin Boettner \u2013 Wyss Institute<br \/><strong>Image: <\/strong>The image is credited to Neuroscience News<\/p>\n<p class=\"has-background\" style=\"background-color:#ffffe8\"><strong>Original Research: <\/strong>Closed access.<br \/>\u201c<a href=\"https:\/\/www.pnas.org\/doi\/10.1073\/pnas.2408949121\" target=\"_blank\" rel=\"noreferrer noopener\">Measurement of \u03b1-synuclein as protein cargo in plasma extracellular vesicles<\/a>\u201d by David Walt et al. <em>PNAS<\/em><\/p>\n<hr class=\"wp-block-separator has-text-color has-pale-cyan-blue-color has-alpha-channel-opacity has-pale-cyan-blue-background-color has-background\"\/>\n<p><strong>Abstract<\/strong><\/p>\n<p><strong>Measurement of \u03b1-synuclein as protein cargo in plasma extracellular vesicles<\/strong><\/p>\n<p>Extracellular vesicles (EVs) are released by all cells and hold great promise as a class of biomarkers. This promise has led to increased interest in measuring EV proteins from both total EVs as well as brain-derived EVs in plasma.<\/p>\n<p>However, measuring cargo proteins in EVs has been challenging because EVs are present at low levels, and EV isolation methods are imperfect at separating EVs from free proteins. Thus, knowing whether a protein measured after EV isolation is truly inside EVs is difficult.<\/p>\n<p>In this study, we developed methods to measure whether a protein is inside EVs and quantify the ratio of a protein in EVs relative to total plasma.<\/p>\n<p>To achieve this, we combined a high-yield size-exclusion chromatography protocol with an optimized protease protection assay and Single Molecule Array (Simoa) digital enzyme-linked immunoassays (ELISAs) for ultrasensitive measurement of proteins inside EVs.<\/p>\n<p>We applied these methods to analyze \u03b1-synuclein and confirmed that a small fraction of the total plasma \u03b1-synuclein is inside EVs. Additionally, we developed a highly sensitive Simoa assay for phosphorylated \u03b1-synuclein (phosphorylated at the Ser129 residue).<\/p>\n<p>We found enrichment in the phosphorylated \u03b1-synuclein to total \u03b1-synuclein ratio inside EVs relative to outside EVs.<\/p>\n<p>Finally, we applied the methods we developed to measure total and phosphorylated \u03b1-synuclein inside EVs from Parkinson\u2019s disease and Lewy body dementia patient samples.<\/p>\n<p>This work provides a framework for determining the levels of proteins in EVs and represents an important step in the development of EV diagnostics for diseases of the brain, as well as other organs.<\/p>\n<p> <!-- Form created by Optin Forms plugin by WPKube: create beautiful optin forms with ease! --> <!-- https:\/\/wpkube.com\/ --><!--optinforms-form5-container--> <!-- \/ Optin Forms --> <\/div>\n<p><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3711241968723425\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-layout-key=\"-fb+5w+4e-db+86\"\r\n     data-ad-client=\"ca-pub-3711241968723425\"\r\n     data-ad-slot=\"7910942971\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><br \/>\n<br \/><div data-type=\"_mgwidget\" data-widget-id=\"1660802\">\r\n<\/div>\r\n<script>(function(w,q){w[q]=w[q]||[];w[q].push([\"_mgc.load\"])})(window,\"_mgq\");\r\n<\/script>\r\n<br \/>\n<br \/><a href=\"https:\/\/neurosciencenews.com\/parkinsons-blood-evs-27968\/\">Source link <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Summary: Researchers have developed a method to analyze extracellular vesicles (EVs) in blood for early detection of Parkinson\u2019s disease (PD). By isolating EVs and assessing their contents, the team identified &hellip; <a href=\"https:\/\/hotvideos24.online\/?p=121478\" class=\"more-link\">Read More<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-121478","post","type-post","status-publish","format-standard","hentry","category-health","entry"],"_links":{"self":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/posts\/121478","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=121478"}],"version-history":[{"count":0,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/posts\/121478\/revisions"}],"wp:attachment":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=121478"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=121478"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=121478"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}