{"id":6001,"date":"2025-04-24T06:55:49","date_gmt":"2025-04-24T04:55:49","guid":{"rendered":"https:\/\/rvh-synergie.org\/actualites\/un-scanner-telt-tots-peut-desormais-aider-a-detecter-les-maladies-cerebrales-en-evaluant-la-permeabilite-de-la-barriere-hemato-encephalique\/"},"modified":"2025-04-24T06:55:50","modified_gmt":"2025-04-24T04:55:50","slug":"un-scanner-telt-tots-peut-desormais-aider-a-detecter-les-maladies-cerebrales-en-evaluant-la-permeabilite-de-la-barriere-hemato-encephalique","status":"publish","type":"post","link":"https:\/\/rvh-synergie.org\/actualites\/un-scanner-telt-tots-peut-desormais-aider-a-detecter-les-maladies-cerebrales-en-evaluant-la-permeabilite-de-la-barriere-hemato-encephalique\/","title":{"rendered":"Un scanner TELT TOTS peut d\u00e9sormais aider \u00e0 d\u00e9tecter les maladies c\u00e9r\u00e9brales en \u00e9valuant la perm\u00e9abilit\u00e9 de la barri\u00e8re h\u00e9mato-enc\u00e9phalique"},"content":{"rendered":"<div>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2025\/a-total-body-pet-scann.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/hires\/2025\/a-total-body-pet-scann.jpg\" data-sub-html=\"The blood-brain barrier (BBB) is commonly treated as a structural barrier (e.g., tightly lined endothelial cells, tight junction proteins, astrocyte end feet) but also comprises various transport systems and mechanisms associated with molecular BBB permeability that can be imaged using the proposed method with many available positron emission tomography (PET) radiotracers. Credit: &lt;i&gt;Nature Communications&lt;\/i&gt; (2025). DOI: 10.1038\/s41467-025-58356-7\">\n<figure class=\"article-img\">\n<\/figure><\/div>\n<\/div>\n<p>L&rsquo;explorateur total du scanner corporel total du corps total de l&rsquo;UC Davis Health est-il donn\u00e9 une autre nouvelle affectation &#8211; \u00e9valuer comment le cancer, les maladies neurod\u00e9g\u00e9n\u00e9ratives et d&rsquo;autres conditions syst\u00e9miques, peuvent affecter le cerveau.<\/p>\n<p>La perc\u00e9e a \u00e9t\u00e9 r\u00e9alis\u00e9e par la radiologie postdoctorale Kevin Chung et d&rsquo;autres coll\u00e8gues d&rsquo;UC Davis Health sous la supervision de Guobao Wang, professeur de radiologie et vice-pr\u00e9sident associ\u00e9 de la recherche, et Simon Cherry, professeur de recherche distingu\u00e9 de g\u00e9nie biom\u00e9dical.<\/p>\n<p>La d\u00e9couverte m\u00e8ne \u00e0 une nouvelle fa\u00e7on d&rsquo;utiliser la tomographie par \u00e9mission de positron (TEP) pour \u00e9valuer quantitativement la sant\u00e9 d&rsquo;une membrane de protection naturelle appel\u00e9e barri\u00e8re h\u00e9mato-enc\u00e9phalique (BBB). Le travail appara\u00eet dans <i>Communications de la nature<\/i>.<\/p>\n<p>Le dysfonctionnement du BBB est associ\u00e9 au syndrome m\u00e9tabolique, au cancer, aux maladies neurod\u00e9g\u00e9n\u00e9ratives et \u00e0 de nombreuses autres conditions syst\u00e9miques.<\/p>\n<p>\u00ab\u00a0Nous n&rsquo;avons pas eu de bonnes approches d&rsquo;imagerie qui peuvent facilement \u00e9valuer la perm\u00e9abilit\u00e9 BBB\u00a0\u00bb, a d\u00e9clar\u00e9 Wang, auteur principal de l&rsquo;\u00e9tude. \u00ab\u00a0Avec cette technique, nous pouvons d\u00e9sormais utiliser PET avec une large gamme de radiotraceurs pour aider \u00e0 d\u00e9terminer la sant\u00e9 de BBB.\u00a0\u00bb<\/p>\n<p>La barri\u00e8re h\u00e9mato-enc\u00e9phalique est une barri\u00e8re s\u00e9lectivement perm\u00e9able qui prot\u00e8ge le cerveau des agents pathog\u00e8nes, des cellules canc\u00e9reuses et d&rsquo;autres dangers. Lorsqu&rsquo;il est en bonne sant\u00e9, le BBB n&rsquo;autorise qu&rsquo;un groupe d&rsquo;\u00e9lite de mol\u00e9cules dans le cerveau. Cependant, la maladie peut modifier la perm\u00e9abilit\u00e9 du BBB, laissant le cerveau plus vuln\u00e9rable.<\/p>\n<p>Pendant des ann\u00e9es, les scientifiques et les radiologues ont utilis\u00e9 l&rsquo;imagerie par r\u00e9sonance magn\u00e9tique (IRM) pour \u00e9tudier la perm\u00e9abilit\u00e9 BBB. Cependant, les IRM ne peuvent mesurer que la fuite des vaisseaux sanguins, qui est un indicateur tardif. En d&rsquo;autres termes, une maladie devrait progresser loin avant que les vaisseaux sanguins ne commencent \u00e0 fuir.<\/p>\n<p>Les efforts ant\u00e9rieurs pour mesurer la perm\u00e9abilit\u00e9 BBB avec PET ont \u00e9t\u00e9 r\u00e9ussis mais assez compliqu\u00e9s. PET utilise des traceurs radioactifs pour image le corps, et les chercheurs ont d\u00fb utiliser deux traceurs, l&rsquo;un pour d\u00e9tecter une cible mol\u00e9culaire sp\u00e9cifique et l&rsquo;autre pour mesurer le flux sanguin. Malheureusement, les traceurs \u00e0 flux de sang sont difficiles \u00e0 obtenir.<\/p>\n<p>\u00ab\u00a0La plupart des traceurs de flux ont une demi-vie tr\u00e8s courte\u00a0\u00bb, a d\u00e9clar\u00e9 Chung, premier auteur de l&rsquo;\u00e9tude et boursier postdoctoral dans le laboratoire Wang. \u00ab\u00a0Un h\u00f4pital aurait besoin d&rsquo;un cyclotron sur place pour faire le traceur, et c&rsquo;est un \u00e9quipement co\u00fbteux. De nombreux h\u00f4pitaux n&rsquo;ont m\u00eame pas cette capacit\u00e9.\u00a0\u00bb<\/p>\n<p>L&rsquo;explorateur a \u00e9t\u00e9 invent\u00e9 par Cherry et Ramsey Badawi, vice-pr\u00e9sident de la recherche au D\u00e9partement de radiologie.<\/p>\n<p>\u00ab\u00a0Cela donne aux chercheurs une r\u00e9solution temporelle beaucoup plus \u00e9lev\u00e9e: la capacit\u00e9 de mesurer des changements biologiques rapides au fil du temps\u00a0\u00bb, a d\u00e9clar\u00e9 Cherry. \u00ab\u00a0L&rsquo;explorateur peut produire des cadres rapides d&rsquo;une seconde ou m\u00eame de plus en plus courts, ce qui \u00e9tait essentiel pour cette \u00e9tude, tandis que d&rsquo;autres machines peuvent n\u00e9cessiter 10 ou m\u00eame 30 secondes.\u00a0\u00bb<\/p>\n<p>Cette r\u00e9solution \u00e9lev\u00e9e temporale, combin\u00e9e \u00e0 une mod\u00e9lisation math\u00e9matique avanc\u00e9e, a contribu\u00e9 \u00e0 rendre la perc\u00e9e possible, et les gains pourraient \u00eatre \u00e9normes. La nouvelle technique peut d\u00e9tecter des changements subtils dans les transporteurs qui transportent des mol\u00e9cules \u00e0 travers le BBB, des marqueurs pr\u00e9coces potentiels pour une perm\u00e9abilit\u00e9 alt\u00e9r\u00e9e et d&rsquo;autres probl\u00e8mes. De plus, les chercheurs ont montr\u00e9 qu&rsquo;ils peuvent mesurer les effets du vieillissement normal sur la sant\u00e9 du BBB, ainsi que la fa\u00e7on dont il r\u00e9agit \u00e0 l&rsquo;inflammation du foie.<\/p>\n<p>\u00ab\u00a0Il s&rsquo;agit d&rsquo;une technique habilitante pour nous de mesurer la perm\u00e9abilit\u00e9 pour presque tous les radiotracer existants, et il y en a plus d&rsquo;un millier\u00a0\u00bb, a d\u00e9clar\u00e9 Wang. \u00ab\u00a0Cela nous donnera beaucoup de flexibilit\u00e9 pour vraiment comprendre ce qui se passe avec le BBB avant que la maladie ne progresse jusqu&rsquo;\u00e0 pr\u00e9sent.\u00a0\u00bb<\/p>\n<p>D&rsquo;autres auteurs, tous de UC Davis, comprenaient: Yasser Abdelhafez, Benjamin Spencer, Terry Jones, Quyen Tran, Lorenzo Nardo, Moon Chen, Souvik Sarkar, Valentina Medici et Victoria Lyo.<\/p>\n<p>                                        <!-- print only --><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>L&rsquo;explorateur total du scanner corporel total du corps total de l&rsquo;UC Davis Health est-il donn\u00e9<\/p>\n","protected":false},"author":1,"featured_media":6002,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[264,3072,3180,1093,856,5034,5036,49,404,5035,669,5031,5032,5033],"class_list":["post-6001","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-maladies","tag-aider","tag-barriere","tag-cerebrales","tag-desormais","tag-detecter","tag-evaluant","tag-hematoencephalique","tag-les","tag-maladies","tag-permeabilite","tag-peut","tag-scanner","tag-telt","tag-tots","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.4 - 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