{"id":3566,"date":"2024-06-14T15:18:17","date_gmt":"2024-06-14T13:18:17","guid":{"rendered":"https:\/\/stopalzheimer.be\/?p=3566"},"modified":"2024-06-18T13:36:46","modified_gmt":"2024-06-18T11:36:46","slug":"demence-frontotemporale-des-chercheurs-belges-realisent-une-importante-decouverte","status":"publish","type":"post","link":"https:\/\/stopalzheimer.be\/fr\/demence-frontotemporale-des-chercheurs-belges-realisent-une-importante-decouverte\/","title":{"rendered":"D\u00e9mence frontotemporale\u00a0: Des chercheurs belges r\u00e9alisent une importante d\u00e9couverte"},"content":{"rendered":"<h2 class=\"wp-block-heading\"><strong>D\u00e9mence frontotemporale&nbsp;: Des chercheurs belges r\u00e9alisent une importante d\u00e9couverte<\/strong><\/h2>\n\n\n\n<p><strong>La d\u00e9mence frontotemporale (DFT) et la scl\u00e9rose lat\u00e9rale amyotrophique (SLA) sont deux maladies neurod\u00e9g\u00e9n\u00e9ratives d\u00e9vastatrices. Bien que les scientifiques aient longtemps suspect\u00e9 le r\u00f4le de la prot\u00e9ine FUS, son m\u00e9canisme restait myst\u00e9rieux. Une nouvelle \u00e9tude du laboratoire de la professeure Sandrine Da Cruz, financ\u00e9e par la Fondation Stop Alzheimer et publi\u00e9e dans Molecular Neurodegeneration, d\u00e9voile le comportement de la prot\u00e9ine FUS dans ces maladies, ouvrant la voie \u00e0 des interventions th\u00e9rapeutiques potentielles.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/stopalzheimer.be\/wp-content\/uploads\/2024\/06\/20240227_093937-1024x768.jpg\" alt=\"\" class=\"wp-image-3567\" srcset=\"https:\/\/stopalzheimer.be\/wp-content\/uploads\/2024\/06\/20240227_093937-1024x768.jpg 1024w, https:\/\/stopalzheimer.be\/wp-content\/uploads\/2024\/06\/20240227_093937-300x225.jpg 300w, https:\/\/stopalzheimer.be\/wp-content\/uploads\/2024\/06\/20240227_093937-768x576.jpg 768w, https:\/\/stopalzheimer.be\/wp-content\/uploads\/2024\/06\/20240227_093937-1536x1152.jpg 1536w, https:\/\/stopalzheimer.be\/wp-content\/uploads\/2024\/06\/20240227_093937-2048x1536.jpg 2048w, https:\/\/stopalzheimer.be\/wp-content\/uploads\/2024\/06\/20240227_093937-16x12.jpg 16w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>La d\u00e9mence frontotemporale (DFT) est une forme de d\u00e9mence pr\u00e9coce, repr\u00e9sentant environ 10 \u00e0 20 % des cas de d\u00e9mence. Contrairement \u00e0 la maladie d&#8217;Alzheimer, qui affecte principalement la m\u00e9moire, la DFT se caract\u00e9rise par des changements de personnalit\u00e9, de comportement et de langage dus \u00e0 la d\u00e9g\u00e9n\u00e9rescence des lobes frontaux et temporaux du cerveau. La scl\u00e9rose lat\u00e9rale amyotrophique (SLA), la maladie des motoneurones la plus courante chez les adultes, se caract\u00e9rise par une perte s\u00e9lective des motoneurones, entra\u00eenant une faiblesse musculaire progressive et une paralysie, ainsi que des probl\u00e8mes de d\u00e9glutition et de parole. Les patients succombent g\u00e9n\u00e9ralement \u00e0 la maladie dans les 2 \u00e0 5 ans suivant le diagnostic. Chaque ann\u00e9e, environ 100 000 personnes meurent de la SLA.<\/p>\n\n\n\n<p>Dans les deux maladies, une prot\u00e9ine appel\u00e9e &#8220;Fused in sarcoma&#8221; (FUS) pose des probl\u00e8mes. Normalement, FUS se trouve principalement dans le noyau cellulaire, mais chez certains patients, elle s&#8217;agglutine (s&#8217;agr\u00e8ge) dans le cytoplasme.<\/p>\n\n\n\n<p>Une nouvelle \u00e9tude financ\u00e9e par la Fondation Stop Alzheimer, dirig\u00e9e par la professeure Sandrine Da Cruz au VIB-KU Leuven Center for Brain &amp; Disease Research, r\u00e9v\u00e8le comment ces agr\u00e9gats de FUS se propagent et se comportent, contribuant ainsi \u00e0 la neurod\u00e9g\u00e9n\u00e9rescence.<\/p>\n\n\n\n<p><strong>Propagation de la maladie<\/strong><\/p>\n\n\n\n<p>Les chercheurs ont inject\u00e9 des agr\u00e9gats de FUS humains associ\u00e9s \u00e0 la maladie dans des souris g\u00e9n\u00e9tiquement modifi\u00e9es pour exprimer la prot\u00e9ine FUS humaine. Remarquablement, les agr\u00e9gats ont agi comme des graines, provoquant l&#8217;agr\u00e9gation et la propagation de la prot\u00e9ine FUS endog\u00e8ne humaine dans le cerveau des souris.<\/p>\n\n\n\n<p>Sonia Vazquez-Sanchez, co-auteure de l&#8217;\u00e9tude. &#8220;<em>Cette d\u00e9couverte sugg\u00e8re un m\u00e9canisme semblable \u00e0 celui des prions, un processus par lequel des prot\u00e9ines mal repli\u00e9es induisent d&#8217;autres prot\u00e9ines \u00e0 se replier de mani\u00e8re similaire, entra\u00eenant la propagation des maladies dans le corps<\/em>. <em>Dans ce cas, les agr\u00e9gats de FUS mal repli\u00e9s &#8220;endommagent&#8221; les prot\u00e9ines FUS saines, entra\u00eenant un effet domino d&#8217;agr\u00e9gation nocive de FUS dans le cerveau.&#8221;<\/em><\/p>\n\n\n\n<p>L&#8217;agr\u00e9gation des prot\u00e9ines FUS a aggrav\u00e9 le d\u00e9clin cognitif li\u00e9 \u00e0 l&#8217;\u00e2ge et les troubles du comportement chez les souris. Ce processus refl\u00e8te ce qui est observ\u00e9 dans les DFT et SLA humaines, o\u00f9 les agr\u00e9gats de prot\u00e9ines se propagent et contribuent \u00e0 la neurod\u00e9g\u00e9n\u00e9rescence.<\/p>\n\n\n\n<p>Une autre d\u00e9couverte importante \u00e9tait la barri\u00e8re d&#8217;esp\u00e8ce pour l&#8217;agr\u00e9gation de FUS. Lorsque des fibrilles de FUS humaines ont \u00e9t\u00e9 inject\u00e9es dans des souris exprimant uniquement la FUS de souris, aucune agr\u00e9gation ne s&#8217;est produite. Cela indique que des interactions sp\u00e9cifiques entre les prot\u00e9ines FUS humaines pourraient \u00eatre n\u00e9cessaires pour l&#8217;agr\u00e9gation et la propagation.<\/p>\n\n\n\n<p><strong>Implications et orientations futures<\/strong><\/p>\n\n\n\n<p>Cette recherche soutient l&#8217;hypoth\u00e8se plus large selon laquelle dans de nombreuses maladies neurod\u00e9g\u00e9n\u00e9ratives, y compris Alzheimer et Parkinson, des m\u00e9canismes semblables \u00e0 ceux des prions pourraient \u00eatre impliqu\u00e9s, o\u00f9 des prot\u00e9ines mal repli\u00e9es se propagent en induisant des prot\u00e9ines similaires \u00e0 se replier de mani\u00e8re anormale. Comprendre ces m\u00e9canismes ouvre de nouvelles possibilit\u00e9s pour des strat\u00e9gies th\u00e9rapeutiques visant \u00e0 stopper ou ralentir la progression de la maladie en s&#8217;attaquant \u00e0 la propagation des agr\u00e9gats de prot\u00e9ines.<\/p>\n\n\n\n<p>L&#8217;\u00e9quipe de recherche examine actuellement les caract\u00e9ristiques sp\u00e9cifiques de la neurod\u00e9g\u00e9n\u00e9rescence induite par les agr\u00e9gats de FUS. <em>&#8220;Identifier les composants exacts de ces agr\u00e9gats et les r\u00e9gions du cerveau les plus touch\u00e9es par leur propagation sera crucial pour le d\u00e9veloppement de futures interventions th\u00e9rapeutiques,&#8221;<\/em> conclut la professeure Sandrine Da Cruz.<\/p>\n\n\n\n<p><strong><em>La presse en parle : <\/em><\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.lesoir.be\/595162\/article\/2024-06-14\/des-chercheurs-belges-font-une-importante-decouverte-sur-la-maladie-de-charcot\">Des chercheurs belges font une importante d\u00e9couverte sur la maladie de Charcot &#8211; Le Soir<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.rtl.be\/actu\/belgique\/politique\/des-chercheurs-de-la-ku-leuven-elucident-le-role-dune-proteine-dans-la-maladie\/2024-06-14\/article\/680054\">Des chercheurs de la KU Leuven \u00e9lucident le r\u00f4le d&#8217;une prot\u00e9ine dans la maladie de Charcot | RTL Info<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.lalibre.be\/dernieres-depeches\/2024\/06\/14\/des-chercheurs-de-la-ku-leuven-elucident-le-role-dune-proteine-dans-la-maladie-de-charcot-C5OWHYHIAVDSRH3TNHSXUAN3WA\/\">Des chercheurs de la KU Leuven \u00e9lucident le r\u00f4le d&#8217;une prot\u00e9ine dans la maladie de Charcot &#8211; La Libre<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.dhnet.be\/dernieres-depeches\/2024\/06\/14\/des-chercheurs-de-la-ku-leuven-elucident-le-role-dune-proteine-dans-la-maladie-de-charcot-C5OWHYHIAVDSRH3TNHSXUAN3WA\/\">Des chercheurs de la KU Leuven \u00e9lucident le r\u00f4le d&#8217;une prot\u00e9ine dans la maladie de Charcot &#8211; La DH\/Les Sports+ (dhnet.be)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.lespecialiste.be\/fr\/actualites\/des-chercheurs-de-la-ku-leuven-elucident-le-role-d-une-proteine-dans-la-maladie-de-charcot.html\">Des chercheurs de la KU Leuven \u00e9lucident le r\u00f4le d&#8217;une prot\u00e9ine dans la maladie de Charcot &#8211; Le Sp\u00e9cialiste (lespecialiste.be)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.mediquality.net\/be-fr\/news\/article\/25742496\/des-chercheurs-belges-decouvrent-le-role-d-une-proteine-dans-la-maladie-de-charcot\">Des chercheurs belges d\u00e9couvrent le r\u00f4le d&#8217;une prot\u00e9ine dans la maladie de Charcot &#8211; MediQuality<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>D\u00e9mence frontotemporale&nbsp;: Des chercheurs belges r\u00e9alisent une importante d\u00e9couverte La d\u00e9mence frontotemporale (DFT) et la scl\u00e9rose lat\u00e9rale amyotrophique (SLA) sont deux maladies neurod\u00e9g\u00e9n\u00e9ratives d\u00e9vastatrices. Bien que les scientifiques aient longtemps suspect\u00e9 le r\u00f4le de la prot\u00e9ine FUS, son m\u00e9canisme restait myst\u00e9rieux. Une nouvelle \u00e9tude du laboratoire de la professeure Sandrine Da Cruz, financ\u00e9e par la [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":3567,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[29],"tags":[],"locatie":[26,41],"class_list":["post-3566","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-onderzoek","locatie-homepage","locatie-pers"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>D\u00e9mence frontotemporale\u00a0: Des chercheurs belges r\u00e9alisent une importante d\u00e9couverte - Stop Alzheimer<\/title>\n<meta name=\"description\" content=\"La compr\u00e9hension du comportement de la prot\u00e9ine FUS ouvre la voie \u00e0 des interventions th\u00e9rapeutiques potentielles.\" \/>\n<meta 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