{"id":15917,"date":"2017-03-22T09:02:09","date_gmt":"2017-03-22T13:02:09","guid":{"rendered":"https:\/\/cna.ca\/?post_type=news&#038;p=15917\/"},"modified":"2020-03-10T13:55:02","modified_gmt":"2020-03-10T17:55:02","slug":"science-nucleaire-etablir-une-cartographie-de-la-maladie-dalzheimer","status":"publish","type":"post","link":"https:\/\/cna.ca\/fr\/2017\/03\/22\/science-nucleaire-etablir-une-cartographie-de-la-maladie-dalzheimer\/","title":{"rendered":"Science nucl\u00e9aire : \u00e9tablir une cartographie de la maladie&nbsp;d\u2019Alzheimer"},"content":{"rendered":"<p>Parmi la population canadienne, ce sont les femmes de plus de 65 ans qui courent le plus grand risque de souffrir de d\u00e9mence et leur nombre augmente de fa\u00e7on consid\u00e9rable. On s\u2019attend \u00e0 ce que le nombre de <a href=\"http:\/\/www.alzheimer.ca\/en\/About-dementia\/What-is-dementia\/Dementia-numbers\">Canadien<\/a>s atteints de d\u00e9mence soit quasiment multipli\u00e9 par deux, avec un million d\u2019individus touch\u00e9s d\u2019ici 2030. Aux \u00c9tats-Unis, un diagnostic de d\u00e9mence est pos\u00e9 toutes les <a href=\"http:\/\/www.alz.org\/facts\/\">66 secondes.<\/a><\/p>\n<p>Avec une population vieillissante importante et des taux de d\u00e9mence en augmentation, le syst\u00e8me de soins de sant\u00e9, d\u00e9j\u00e0 sous tension, est mis \u00e0 rude \u00e9preuve, tout particuli\u00e8rement les \u00e9tablissements de soins de longue dur\u00e9e. \u00c0 travers le pays, <a href=\"http:\/\/news.nationalpost.com\/news\/canada\/ontarios-long-term-care-problem-seniors-staying-at-home-longer-isnt-a-cure-for-waiting-lists\">les listes d\u2019attente<\/a> pour les soins de longue dur\u00e9e varient en fonction des provinces mais il arrive parfois que les d\u00e9lais d\u2019attente soient sup\u00e9rieurs \u00e0 un an. En raison d\u2019une demande massive en soins de sant\u00e9 coupl\u00e9e \u00e0 une p\u00e9nurie de lits, nombre de personnes \u00e2g\u00e9es sont contraintes de rester chez elles plus longtemps.<\/p>\n<p>Le diagnostic pr\u00e9coce de la maladie d\u2019Alzheimer est une \u00e9tape importante de la planification, aussi bien pour les patients eux-m\u00eames que pour leur famille. Une \u00e9tape devenue plus r\u00e9aliste gr\u00e2ce \u00e0 la science nucl\u00e9aire et \u00e0 la technique de <a href=\"http:\/\/www.brightfocus.org\/alzheimers\/grant\/stable-isotope-labeling-kinetics-human-tau-alzheimers-disease\">cin\u00e9tique de marquage isotopique stable (stable isotope labeling kinetics, SILK)<\/a>.<\/p>\n<p>Les cellules nerveuses de notre cerveau contiennent des prot\u00e9ines tau. Ces prot\u00e9ines ont pour fonction de stabiliser d\u2019autres prot\u00e9ines pr\u00e9sentes dans le cerveau, les microtubules. Ces microtubules sont responsables de la structure et du d\u00e9placement des cellules. Des d\u00e9couvertes r\u00e9centes faites par la <a href=\"https:\/\/medicine.wustl.edu\/news\/brain-imaging-links-alzheimers-decline-to-tau-protein\/\">\u00a0facult\u00e9 de m\u00e9decine de l\u2019Universit\u00e9 de Washington \u00e0 St Louis aux \u00c9tats-Unis<\/a> et publi\u00e9es l\u2019automne dernier r\u00e9v\u00e8lent l\u2019importance des prot\u00e9ines tau dans les premiers stades d\u2019\u00e9volution de la maladie d\u2019Alzheimer.<\/p>\n<p>\u00ab\u00a0La prot\u00e9ine tau est pr\u00e9sente en tr\u00e8s grand nombre dans les cellules nerveuses du cerveau. C\u2019est l\u00e0 qu\u2019elle stabilise l\u2019\u00e9chafaudage des microtubules, qui jouent un r\u00f4le critique dans le transport de contenu au sein des cellules. Mais dans le cas de la maladie d\u2019Alzheimer \u2013 ainsi que dans d\u2019autres \u201ctauopathies\u201d, comme la paralysie supranucl\u00e9aire progressive et la d\u00e9mence fronto-temporale \u2013 des amas de prot\u00e9ine tau se d\u00e9posent de fa\u00e7on anormale dans les cellules nerveuses sous forme d\u2019\u00e9cheveaux.\u00a0\u00bb<\/p>\n<p>Afin d\u2019\u00e9valuer l\u2019\u00e9tat de sant\u00e9 et les concentrations de prot\u00e9ine tau d\u2019un patient, on lui administre un isotope stable d\u2019acides amin\u00e9s, avant de mesurer la quantit\u00e9 de prot\u00e9ine tau marqu\u00e9e produite par son cerveau, au moyen de la <a href=\"http:\/\/www.healthline.com\/health\/pet-scan\">tomographie par \u00e9mission de positrons (TEP)<\/a>. Une fois la quantit\u00e9 de prot\u00e9ine tau connue, les chercheurs peuvent calculer la vitesse \u00e0 laquelle la prot\u00e9ine est produite et \u00e9limin\u00e9e par le cerveau.<\/p>\n<p>La recherche a permis de d\u00e9montrer que les cerveaux des personnes les plus susceptibles d\u2019\u00eatre atteintes de d\u00e9mence pr\u00e9sentent une accumulation de prot\u00e9ines dysfonctionnelles et ont plus de difficult\u00e9s \u00e0 \u00e9liminer les prot\u00e9ines en exc\u00e8s que les cerveaux des patients en bonne sant\u00e9. Bien qu\u2019il \u00a0ne s\u2019agisse pas d\u2019un traitement, cette d\u00e9couverte pourrait toutefois redonner espoir aux patients et \u00e0 leurs familles.<\/p>\n<p>\u00ab\u00a0Habituellement, nous ne pouvons poser un diagnostic qu\u2019\u00e0 un stade tardif dans l\u2019\u00e9volution de la maladie, lorsque les fonctions c\u00e9r\u00e9brales sont d\u00e9j\u00e0 atteintes\u00a0\u00bb, a d\u00e9clar\u00e9 l\u2019auteur principal de l\u2019\u00e9tude,\u00a0<a href=\"https:\/\/wuphysicians.wustl.edu\/for-patients\/find-a-physician\/beau-m-ances\">Beau M. Ances<\/a>, M.D., Ph. D., professeur agr\u00e9g\u00e9 de neurologie. \u00ab\u00a0Nous souhaitons d\u00e9velopper de nouveaux moyens qui nous permettront de poser un diagnostic \u00e0 un stade plus pr\u00e9coce et de concevoir des \u00e9tudes pour tester des m\u00e9dicaments contre l\u2019accumulation de la prot\u00e9ine amylo\u00efde et de la prot\u00e9ine tau. \u00c0 ce jour, nous ne sommes pas en mesure de pr\u00e9venir ni de gu\u00e9rir la maladie d\u2019Alzheimer, mais le fait de retarder l\u2019apparition des sympt\u00f4mes de la maladie de 10 \u00e0 15 ans ferait une diff\u00e9rence \u00e9norme pour nos patients, leurs familles et le personnel soignant, ainsi que pour l\u2019\u00e9conomie mondiale.\u00a0\u00bb<\/p>\n<p>En plus de ses travaux sur les prot\u00e9ines tau, l\u2019\u00e9cole s\u2019est vu accorder r\u00e9cemment 4,3\u00a0millions de dollars par l\u2019Association Alzheimer en vue d\u2019\u00e9largir une \u00e9tude clinique internationale qui tentera d\u2019identifier des m\u00e9dicaments capables de ralentir ou de pr\u00e9venir la maladie d\u2019Alzheimer chez les patients g\u00e9n\u00e9tiquement pr\u00e9dispos\u00e9s mais ne pr\u00e9sentant pas de sympt\u00f4mes. La science nucl\u00e9aire jouera un r\u00f4le important dans cette recherche d\u2019un traitement visant \u00e0 am\u00e9liorer la vie des patients dans le monde entier.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Parmi la population canadienne, ce sont les femmes de plus de 65 ans qui courent le plus grand risque de souffrir de d\u00e9mence et leur nombre augmente de fa\u00e7on consid\u00e9rable. On s\u2019attend \u00e0 ce que le nombre de Canadiens atteints de d\u00e9mence soit quasiment multipli\u00e9 par deux, avec un million d\u2019individus touch\u00e9s d\u2019ici 2030. Aux \u00c9tats-Unis, un diagnostic de d\u00e9mence est pos\u00e9 toutes les 66 secondes.<\/p>\n","protected":false},"author":1,"featured_media":16344,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[244],"tags":[],"topic":[],"class_list":["post-15917","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-contenu-vedette"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Science nucl\u00e9aire : \u00e9tablir une cartographie de la maladie d\u2019Alzheimer - Association nucl\u00e9aire canadienne<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cna.ca\/fr\/2017\/03\/22\/science-nucleaire-etablir-une-cartographie-de-la-maladie-dalzheimer\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Science nucl\u00e9aire : \u00e9tablir une cartographie de la maladie d\u2019Alzheimer - Association nucl\u00e9aire canadienne\" \/>\n<meta property=\"og:description\" content=\"Parmi la population canadienne, ce sont les femmes de plus de 65 ans qui courent le plus grand risque de souffrir de d\u00e9mence et leur nombre augmente de fa\u00e7on consid\u00e9rable. On s\u2019attend \u00e0 ce que le nombre de Canadiens atteints de d\u00e9mence soit quasiment multipli\u00e9 par deux, avec un million d\u2019individus touch\u00e9s d\u2019ici 2030. 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On s\u2019attend \u00e0 ce que le nombre de Canadiens atteints de d\u00e9mence soit quasiment multipli\u00e9 par deux, avec un million d\u2019individus touch\u00e9s d\u2019ici 2030. 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