{"id":1013,"date":"2023-05-12T22:29:39","date_gmt":"2023-05-12T20:29:39","guid":{"rendered":"https:\/\/www.linkidoc.fr\/blog\/2023\/05\/12\/lechographie-implantee-permet-a-la-chimio-dacceder-au-cerveau\/"},"modified":"2023-05-12T22:29:41","modified_gmt":"2023-05-12T20:29:41","slug":"lechographie-implantee-permet-a-la-chimio-dacceder-au-cerveau","status":"publish","type":"post","link":"https:\/\/www.linkidoc.fr\/blog\/2023\/05\/12\/lechographie-implantee-permet-a-la-chimio-dacceder-au-cerveau\/","title":{"rendered":"L&rsquo;\u00e9chographie implant\u00e9e permet \u00e0 la chimio d&rsquo;acc\u00e9der au cerveau"},"content":{"rendered":"<div>\n<figure class=\"wp-block-image size-full\"><noscript><img loading=\"lazy\" decoding=\"async\" width=\"770\" height=\"522\" src=\"https:\/\/www.linkidoc.fr\/blog\/wp-content\/uploads\/2023\/05\/Lechographie-implantee-permet-a-la-chimio-dacceder-au-cerveau.jpg\" alt=\"\" class=\"wp-image-1548585\"  \/><\/noscript><\/figure>\n<p>Des chercheurs de l&rsquo;Universit\u00e9 Northwestern ont suivi un appareil \u00e0 ultrasons implant\u00e9 chez des patients, qui est utilis\u00e9 en combinaison avec des microbulles pour ouvrir de mani\u00e8re transitoire les pores de la barri\u00e8re h\u00e9mato-enc\u00e9phalique, permettant aux m\u00e9dicaments chimio d&rsquo;entrer.  Nous avons d\u00e9j\u00e0 fait \u00e9tat de cette technique en tant que concept de laboratoire (voir les flashbacks ci-dessous), mais c&rsquo;est la premi\u00e8re fois qu&rsquo;elle est r\u00e9ellement test\u00e9e sur des patients humains, en l&rsquo;occurrence des patients atteints de glioblastome, un cancer du cerveau difficile \u00e0 traiter.  L&rsquo;approche a conduit avec succ\u00e8s \u00e0 une multiplication par quatre \u00e0 six des concentrations de chimio dans le cerveau, en utilisant des m\u00e9dicaments qui ne sont pas autrement capables de traverser la barri\u00e8re h\u00e9mato-enc\u00e9phalique, suscitant l&rsquo;espoir que la technique pourrait ouvrir la voie \u00e0 un traitement efficace.   <\/p>\n<p>Une combinaison microbulles\/ultrasons a \u00e9t\u00e9 propos\u00e9e il y a longtemps comme moyen d&rsquo;ouvrir temporairement la barri\u00e8re h\u00e9mato-enc\u00e9phalique pour permettre \u00e0 certains m\u00e9dicaments de p\u00e9n\u00e9trer dans le cerveau.  Bien qu&rsquo;il se soit montr\u00e9 prometteur dans des mod\u00e8les animaux, il s&rsquo;agit du premier essai clinique qui a montr\u00e9 qu&rsquo;il pouvait \u00e9galement fonctionner chez l&rsquo;homme.  Les enjeux sont importants, car le glioblastome, le cancer du cerveau qui \u00e9tait au centre de l&rsquo;essai, n&rsquo;a actuellement aucun traitement efficace.<\/p>\n<p>En guise de rappel, le concept consiste \u00e0 administrer un flux de microbulles dans la circulation sanguine, puis \u00e0 utiliser des ultrasons pour les faire vibrer lorsqu&rsquo;elles traversent les vaisseaux sanguins du cerveau.  Cette vibration provoque l&rsquo;ouverture de pores transitoires dans l&rsquo;endoth\u00e9lium sp\u00e9cialis\u00e9 qui tapisse ces vaisseaux, ce qui entra\u00eene une faiblesse exploitable de la barri\u00e8re h\u00e9mato-enc\u00e9phalique.  Un agent chimioth\u00e9rapeutique administr\u00e9 dans la circulation sanguine pendant cette fen\u00eatre th\u00e9rapeutique peut alors traverser ces pores et acc\u00e9der au cerveau.<!-- ASYNC UAT M - 300x250(t,r) - --><\/p>\n<p><!-- END ASYNC UAT M - 300x250(t,r) --><\/p>\n<p>Cette version de la technique consiste en fait \u00e0 implanter une grille de neuf \u00e9metteurs d&rsquo;ultrasons dans le cr\u00e2ne.  L&rsquo;appareil a \u00e9t\u00e9 con\u00e7u par une soci\u00e9t\u00e9 fran\u00e7aise de biotechnologie appel\u00e9e Carthera.  Lorsqu&rsquo;ils sont activ\u00e9s, les \u00e9metteurs peuvent baigner une partie importante du cerveau dans les ultrasons.  L&rsquo;essai impliquait des patients atteints de glioblastome dont la tumeur avait \u00e9t\u00e9 r\u00e9s\u00e9qu\u00e9e et l&rsquo;appareil \u00e0 ultrasons implant\u00e9 au cours de la m\u00eame intervention chirurgicale.  Voici un exemple vid\u00e9o de la proc\u00e9dure :<\/p>\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\">\n<div class=\"wp-block-embed__wrapper\">\n<img decoding=\"async\" class=\"lazy lazy-hidden\" data-lazy-type=\"iframe\" src=\"&lt;iframe loading=&quot;lazy&quot; title=&quot;Ultrasound Opens Blood Brain Barrier to Let In Cancer Drugs&quot; width=&quot;770&quot; height=&quot;433&quot; bad-src=&quot;https:\/\/www.youtube.com\/embed\/swYviF0ucK0?feature=oembed&quot; frameborder=&quot;0&quot; allow=&quot;accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share&quot; allowfullscreen&gt;&lt;\/iframe&gt;\" alt=\"\"\/><noscript><iframe loading=\"lazy\" title=\"Ultrasound Opens Blood Brain Barrier to Let In Cancer Drugs\" width=\"1200\" height=\"675\" src=\"https:\/\/www.youtube.com\/embed\/swYviF0ucK0?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/noscript>\n<\/div>\n<\/figure>\n<p>De mani\u00e8re frappante, la technique a conduit \u00e0 une augmentation marqu\u00e9e de la quantit\u00e9 de m\u00e9dicament atteignant le cerveau, avec des augmentations de 4 \u00e0 6 fois observ\u00e9es pour des m\u00e9dicaments tels que le paclitaxel, qui n&rsquo;est g\u00e9n\u00e9ralement pas administr\u00e9 pour les tumeurs situ\u00e9es derri\u00e8re la barri\u00e8re h\u00e9mato-enc\u00e9phalique, car il ne peut pas traversent g\u00e9n\u00e9ralement la barri\u00e8re en quantit\u00e9s importantes.  \u00ab\u00a0Alors que nous nous sommes concentr\u00e9s sur le cancer du cerveau (pour lequel il existe environ 30 000 gliomes aux \u00c9tats-Unis), cela ouvre la porte \u00e0 l&rsquo;\u00e9tude de nouveaux traitements m\u00e9dicamenteux pour des millions de patients souffrant de diverses maladies du cerveau\u00a0\u00bb, a d\u00e9clar\u00e9 Adam Sonabend, un chercheur. impliqu\u00e9s dans l&rsquo;\u00e9tude.<\/p>\n<p>Voir une vid\u00e9o sur la technologie ci-dessous :<\/p>\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\">\n<div class=\"wp-block-embed__wrapper\">\n<img decoding=\"async\" class=\"lazy lazy-hidden\" data-lazy-type=\"iframe\" src=\"&lt;iframe loading=&quot;lazy&quot; title=&quot;SonoCloud-9 Animation&quot; width=&quot;770&quot; height=&quot;433&quot; bad-src=&quot;https:\/\/www.youtube.com\/embed\/KSDhqhKL-JQ?feature=oembed&quot; frameborder=&quot;0&quot; allow=&quot;accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share&quot; allowfullscreen&gt;&lt;\/iframe&gt;\" alt=\"\"\/><noscript><a href=\"https:\/\/www.youtube.com\/watch?v=KSDhqhKL-JQ\">https:\/\/www.youtube.com\/watch?v=KSDhqhKL-JQ<\/a><\/noscript>\n<\/div>\n<\/figure>\n<p>\u00c9tudier dans la revue <em>L&rsquo;oncologie du Lancet<\/em>: Ouverture r\u00e9p\u00e9t\u00e9e de la barri\u00e8re h\u00e9mato-enc\u00e9phalique avec un appareil \u00e0 ultrasons implantable pour l&rsquo;administration de paclitaxel li\u00e9 \u00e0 l&rsquo;albumine chez les patients atteints de glioblastome r\u00e9current\u00a0: un essai de phase\u00a01<\/p>\n<p>Flashbacks\u00a0: ultrasons et microbulles utilis\u00e9s pour p\u00e9n\u00e9trer la barri\u00e8re h\u00e9mato-enc\u00e9phalique\u00a0;  L&rsquo;\u00e9chographie \u00e0 courte longueur d&rsquo;onde aide les m\u00e9dicaments \u00e0 p\u00e9n\u00e9trer dans le cerveau de mani\u00e8re plus s\u00fbre\u00a0;  Les ultrasons focalis\u00e9s et les microbulles poussent les m\u00e9dicaments \u00e0 travers la barri\u00e8re h\u00e9mato-enc\u00e9phalique\u00a0;  Ouverture temporaire de la barri\u00e8re h\u00e9mato-enc\u00e9phalique \u00e0 l&rsquo;aide d&rsquo;ondes ultrasonores<\/p>\n<p>Via : Nord-Ouest<\/p>\n<p><!--TrendMD v2.4.8--><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Des chercheurs de l&rsquo;Universit\u00e9 Northwestern ont suivi un appareil \u00e0 ultrasons implant\u00e9 chez des patients, qui est utilis\u00e9 en combinaison<\/p>\n","protected":false},"author":1,"featured_media":1014,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1354,1352,1353,1351,1350,682],"class_list":["post-1013","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-classe","tag-cerveau","tag-chimio","tag-dacceder","tag-implantee","tag-lechographie","tag-permet","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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