{"id":6768,"date":"2026-08-11T13:33:36","date_gmt":"2026-08-11T11:33:36","guid":{"rendered":"https:\/\/stopalzheimer.be\/?p=6768"},"modified":"2026-08-11T13:33:38","modified_gmt":"2026-08-11T11:33:38","slug":"sommeil-alzheimer-micro-reveils-stopalzheimer","status":"publish","type":"post","link":"https:\/\/stopalzheimer.be\/nl\/sommeil-alzheimer-micro-reveils-stopalzheimer\/","title":{"rendered":"Le sommeil pourrait aider \u00e0 rep\u00e9rer plus t\u00f4t les personnes \u00e0 risques de d\u00e9velopper Alzheimer"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Le sommeil pourrait aider \u00e0 rep\u00e9rer plus t\u00f4t les personnes \u00e0 risques de d\u00e9velopper la maladie d&#8217;Alzheimer<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Et si certains signes de la maladie se manifestaient discr\u00e8tement pendant le sommeil, bien avant les premiers troubles de la m\u00e9moire ? C&#8217;est la piste qu&#8217;explore une \u00e9quipe de chercheurs de l&#8217;ULi\u00e8ge, avec le soutien de notre Fondation. <\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Une \u00e9quipe de scientifiques de l&#8217;Universit\u00e9 de Li\u00e8ge (GIGA Neurosciences), soutenue par notre Fondation, a analys\u00e9 le sommeil de plus de 500 personnes en bonne sant\u00e9. Chez les participants d&#8217;\u00e2ge m\u00fbr, une fr\u00e9quence plus \u00e9lev\u00e9e de micro-r\u00e9veils nocturnes s&#8217;av\u00e8re associ\u00e9e \u00e0 un risque g\u00e9n\u00e9tique plus important de d\u00e9velopper la maladie d&#8217;Alzheimer alors que ce lien n&#8217;appara\u00eet pas chez les jeunes adultes. Ces travaux, publi\u00e9s dans la revue Sleep, sugg\u00e8rent que l&#8217;\u00e9tude du sommeil pourrait, \u00e0 terme, contribuer au rep\u00e9rage pr\u00e9coce des personnes vuln\u00e9rables.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Depuis plusieurs ann\u00e9es, les scientifiques du monde entier \u00e9tudient le lien entre troubles du sommeil et maladies neurod\u00e9g\u00e9n\u00e9ratives. Une \u00e9tude r\u00e9cente men\u00e9es par des scientifiques de l&#8217;Universit\u00e9 de Li\u00e8ge apportent un \u00e9l\u00e9ment nouveau en postulant que ce lien pourrait s&#8217;installer avant toute manifestation clinique de la maladie&#8230; pour l&#8217;\u00e9tablir, les chercheurs ont exploit\u00e9 le caract\u00e8re en partie g\u00e9n\u00e9tique (la maladie d&#8217;Alzheimer n&#8217;est ni purement h\u00e9r\u00e9ditaire, ni totalement ind\u00e9pendante des g\u00e8nes) de la maladie afin de calculer un risque polyg\u00e9nique (c-\u00e0-d. r\u00e9sumer en un seul chiffre l&#8217;influence combin\u00e9e de vos g\u00e8nes sur votre probabilit\u00e9 de d\u00e9velopper une maladie donn\u00e9e) chez plus de 500 personnes en bonne sant\u00e9, en majorit\u00e9 de jeunes adultes (18 \u00e0 31 ans), mais aussi des personnes plus \u00e2g\u00e9es (50 \u00e0 69 ans). Avant de continuer, il est important de noter que le risque polyg\u00e9nique reste toujours faible et ne permet pas de pr\u00e9dire qui d\u00e9veloppera la maladie. Avec cette estimation du risque, l&#8217;\u00e9quipe a cherch\u00e9 des correspondances avec les caract\u00e9ristiques du sommeil des participants.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les r\u00e9sultats montrent cette fois-ci que le risque g\u00e9n\u00e9tique de d\u00e9velopper la maladie d&#8217;Alzheimer est li\u00e9 \u00e0 la fr\u00e9quence des micro-r\u00e9veils nocturnes, de br\u00e8ves activations c\u00e9r\u00e9brales qui ne r\u00e9veillent pas compl\u00e8tement le dormeur mais peuvent perturber le d\u00e9roulement du sommeil. Aucun lien n&#8217;appara\u00eet chez les plus jeunes. Chez les participants plus \u00e2g\u00e9s, en revanche, des micro-r\u00e9veils plus fr\u00e9quents vont de pair avec un risque g\u00e9n\u00e9tique plus \u00e9lev\u00e9, alors m\u00eame qu&#8217;ils restent relativement jeunes et ne pr\u00e9sentent aucun signe de la maladie. <em>\u00ab Ces micro-r\u00e9veils ne sont donc pas anodins, <\/em>souligne Puneet Talwar, chercheur au sein du GIGA Institute,<em> certains profils pourraient favoriser l&#8217;accumulation des prot\u00e9ines impliqu\u00e9es dans la maladie d&#8217;Alzheimer et \u00eatre associ\u00e9s \u00e0 une vuln\u00e9rabilit\u00e9 accrue. \u00bb<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les chercheurs se sont int\u00e9ress\u00e9s en parall\u00e8le au locus <em>coeruleus<\/em>, une r\u00e9gion nich\u00e9e dans le tronc c\u00e9r\u00e9bral, de la taille d&#8217;un grain de riz, qui est impliqu\u00e9e dans l&#8217;\u00e9veil, l&#8217;attention et la r\u00e9gulation du sommeil. <em>\u00ab Cette r\u00e9gion est difficile \u00e0 observer, mais elle semble jouer un r\u00f4le dans les m\u00e9canismes pr\u00e9coces li\u00e9s \u00e0 la maladie \u00bb<\/em>, explique Gilles Vandewalle, co-directeur de la plateforme technologique GIGA CRC In Vivo Imaging et directeur de recherches FNRS \u00e0 l&#8217;ULi\u00e8ge. En 2025 d\u00e9j\u00e0 lors d&#8217;une \u00e9tude pr\u00e9alable(2) ayant recourt \u00e0 l&#8217;IRM 7 Tesla, install\u00e9 au sein de la plateforme de l&#8217;ULi\u00e8ge, l&#8217;\u00e9quipe avait pu analyser finement ce locus <em>coeruleus <\/em>et montrer que la qualit\u00e9 du sommeil (rapidit\u00e9 d&#8217;endormissement, profondeur) \u00e9tait li\u00e9e \u00e0 l&#8217;\u00e9tat du tronc c\u00e9r\u00e9bral d\u00e8s le jeune \u00e2ge, et que le bon fonctionnement du locus <em>coeruleus<\/em> d\u00e9pendait de la qualit\u00e9 du sommeil paradoxal, une phase importante pour la m\u00e9moire. En effet, le locus <em>coeruleus <\/em>pr\u00e9sente un int\u00e9r\u00eat particulier&nbsp;: c&#8217;est l&#8217;une des premi\u00e8res r\u00e9gions o\u00f9 apparaissent des d\u00e9p\u00f4ts anormaux de prot\u00e9ines, parfois d\u00e8s l&#8217;adolescence, sans que l&#8217;on sache encore ce que cela implique.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ces observations compil\u00e9es ouvrent des perspectives pour le d\u00e9pistage et la pr\u00e9vention. \u00c0 terme, l&#8217;analyse du sommeil pourrait compl\u00e9ter les outils permettant d&#8217;identifier les personnes \u00e0 risque avant l&#8217;apparition des sympt\u00f4mes. <em>\u00ab Le sommeil pourrait devenir un marqueur accessible pour rep\u00e9rer pr\u00e9cocement les personnes vuln\u00e9rables \u00bb<\/em>, reprend Gilles Vandewalle. Une autre piste consiste \u00e0 agir sur la qualit\u00e9 du sommeil pour tenter de pr\u00e9venir ou de ralentir la maladie chez les personnes g\u00e9n\u00e9tiquement pr\u00e9dispos\u00e9es. <em>\u00ab Ces travaux montrent que le sommeil n&#8217;est pas seulement un indicateur de sant\u00e9, mais aussi un levier possible d&#8217;intervention \u00bb<\/em>, ajoute Lucie Leroux, responsable des activit\u00e9s francophones de la Fondation Stop Alzheimer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alors que la maladie d&#8217;Alzheimer touche plus de 220 000 personnes en Belgique, ces r\u00e9sultats restent des associations statistiques qui demandent \u00e0 \u00eatre confirm\u00e9es et ne permettent pas, \u00e0 ce stade, de pr\u00e9dire la maladie chez un individu. Ils rappellent n\u00e9anmoins l&#8217;int\u00e9r\u00eat de la recherche fondamentale pour mieux comprendre et, un jour, anticiper la maladie.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>R\u00e9f\u00e9rence bibliographique<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Nasrin Mortazavi, Mikhail Zubkov, Daphne Chylinski, Fabienne Collette, Christine Bastin, Pierre Maquet, Gilles Vandewalle, Puneet Talwar, Sleep arousals are associated with the polygenic risk for developing Alzheimer\u2019s disease and with cognitive change in healthy late middle-aged individuals, <em>Sleep<\/em>, May 2026, <a href=\"https:\/\/doi.org\/10.1093\/sleep\/zsag143\">https:\/\/doi.org\/10.1093\/sleep\/zsag143<\/a><\/li>\n\n\n\n<li>Mortazavi, N., Talwar, P., Koshmanova, E. <em>et al.<\/em> REM sleep quality is associated with balanced tonic activity of the locus coeruleus during wakefulness. <em>J Biomed Sci<\/em> <strong>32<\/strong>, 35 (2025). https:\/\/doi.org\/10.1186\/s12929-025-01127-9 https:\/\/link.springer.com\/article\/10.1186\/s12929-025-01127-9<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le sommeil pourrait aider \u00e0 rep\u00e9rer plus t\u00f4t les personnes \u00e0 risques de d\u00e9velopper la maladie d&#8217;Alzheimer Et si certains signes de la maladie se manifestaient discr\u00e8tement pendant le sommeil, bien avant les premiers troubles de la m\u00e9moire ? C&#8217;est la piste qu&#8217;explore une \u00e9quipe de chercheurs de l&#8217;ULi\u00e8ge, avec le soutien de notre Fondation. [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":6769,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[29],"tags":[],"locatie":[27,26,28,41],"class_list":["post-6768","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-onderzoek","locatie-help-mee","locatie-homepage","locatie-over-alzheimer","locatie-pers"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le sommeil pourrait aider \u00e0 rep\u00e9rer plus t\u00f4t les personnes \u00e0 risques de d\u00e9velopper Alzheimer -<\/title>\n<meta name=\"description\" content=\"Des micro r\u00e9veils nocturnes fr\u00e9quents sont li\u00e9s \u00e0 un risque g\u00e9n\u00e9tique accru d&#039;Alzheimer, selon une \u00e9tude de l&#039;ULi\u00e8ge.\" \/>\n<meta name=\"robots\" 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