{"id":25018,"date":"2026-02-23T12:00:00","date_gmt":"2026-02-23T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/politique\/prise-de-sang-predictive-pour-alzheimer-et-demences"},"modified":"2026-02-24T03:39:08","modified_gmt":"2026-02-24T03:39:08","slug":"prise-de-sang-predictive-pour-alzheimer-et-demences","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/prise-de-sang-predictive-pour-alzheimer-et-demences","title":{"rendered":"Prise de Sang Pr\u00e9dictive pour Alzheimer et D\u00e9mences"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; S\u00e3o Tom\u00e9 e Pr\u00edncipe. <\/strong><\/span>Tels des colis contenant des messages secrets, les ve\u0301sicules envoye\u0301es et rec\u0327ues par nos cellules pourraient nous informer sur la probabilite\u0301 de de\u0301velopper une maladie neurode\u0301ge\u0301ne\u0301rative dans le futur. \u00ab Les cellules libe\u0300rent volontairement ces ve\u0301sicules, qui en deviennent le miroir \u00bb, appuie le neuroscientifique Jean-Christophe Delpech, chercheur a\u0300 l\u2019Inrae. Son projet BEACON, axe\u0301 sur cette que\u0302te de la signature du vieillissement anormal du cerveau dans les ve\u0301sicules extracellulaires, lui a valu de remporter le Prix Desmarest en janvier 2026. Remis par la Fondation Pierre Deniker luttant pour la sante\u0301 mentale, ce prix comprend une bourse de recherche de 100.000 euros.<\/p>\n<p><b>Les ve\u0301sicules extracellulaires, miroir de l\u2019e\u0301tat et des besoins de nos cellules<\/b><\/p>\n<p>\u00ab Nous cherchons un marqueur de de\u0301clin acce\u0301le\u0301re\u0301, pour de\u0301tecter les gens dont la me\u0301moire et la cognition de\u0301clinent plus vite que la normale, au stade ou\u0300 on ne parle pas encore de maladie \u00bb, annonce Jean-Christophe Delpech a\u0300 Sciences et Avenir. Ce marqueur, il entend le trouver dans les ve\u0301sicules extracellulaires circulant dans le sang. Emises et rec\u0327ues en continu par nos cellules, ces minuscules \u00ab bulles \u00bb \u2013 les plus petites faisant la taille de bacte\u0301ries, de 20 a\u0300 200 nanome\u0300tres \u2013 contiennent des prote\u0301ines, lipides, ARN ou encore des fragments d\u2019ADN. Un monde d\u2019informations et de mate\u0301riel biologique qui peuvent me\u0302me agir par elles-me\u0302mes. \u00ab Les plaquettes par exemple libe\u0300rent des ve\u0301sicules extracellulaires qui participent a\u0300 la coagulation \u00bb, illustre Jean-Christophe Delpech. Certaines servent de ve\u0301ritables petits colis au be\u0301ne\u0301fice de cellules parfois tre\u0300s distantes. \u00ab Des donne\u0301es re\u0301centes sugge\u0300rent que des ve\u0301sicules d\u2019origine bacte\u0301rienne produites dans l\u2019intestin sont retrouve\u0301es au niveau de certaines cellules du cerveau, qui posse\u0300dent ainsi des micro ARN qu\u2019elles ne peuvent pas produire elles-me\u0302mes ! \u00bb Ces ve\u0301sicules sont d\u2019ailleurs e\u0301tudie\u0301es comme ve\u0301hicules possibles de me\u0301dicaments, mais les scientifiques peinent encore a\u0300 trouver un moyen de les adresser au bon destinataire.<\/p>\n<p><b>Des ve\u0301sicules contenant des marqueurs de de\u0301mence<\/b><\/p>\n<p>Miroirs des cellules qui les produisent, les ve\u0301sicules extracellulaires refle\u0300tent e\u0301galement leur e\u0301tat pathologique. \u00ab Par rapport a\u0300 un individu sain du me\u0302me a\u0302ge, les ve\u0301sicules d\u2019une personne souffrant de la maladie d\u2019Alzheimer contiennent plus de prote\u0301ines tau phosphoryle\u0301es, notamment la phospho217, a\u0300 mesure que la maladie avance \u00bb, explique Jean-Christophe Delpech. La phospho-tau 217 ou p-tau217 est de plus en plus conside\u0301re\u0301e comme un marqueur diagnostic de la maladie d\u2019Alzheimer, retrouve\u0301e dans le sang ou le plasma. Mais ce n\u2019est pas ce genre de marqueur, caracte\u0301ristique d\u2019une maladie de\u0301ja\u0300 installe\u0301e, qui inte\u0301resse Jean-Christophe Delpech. L\u2019objectif de BEACON, c\u2019est de trouver un marqueur sanguin pre\u0301dictif d\u2019un de\u0301clin cognitif encore pas ou peu amorce\u0301. \u00ab Nous cherchons d\u2019abord la signature d\u2019une e\u0301volution vers une trajectoire anormale dans les ve\u0301sicules totales, c\u2019est la premie\u0300re e\u0301tape. A terme, nous aimerions examiner des sous-types de ve\u0301sicules pour voir si on observe un encore meilleur signal et une meilleure pre\u0301diction. \u00bb<\/p>\n<p><b>Pre\u0301dire pourquoi certains ont le cerveau qui vieillissent mieux que d\u2019autres<\/b><\/p>\n<p>L\u2019e\u0301quipe de chercheurs, en collaboration avec l\u2019e\u0301quipe Inserm bordelaise de la neuroscientifique Nora Abrous, a d\u2019ores et de\u0301ja\u0300 identifie\u0301 60 marqueurs potentiels dans les ve\u0301sicules extracellulaires de rats, en comparant deux populations qui, bien que ge\u0301ne\u0301tiquement homoge\u0300nes, ont des trajectoires cognitives distinctes. \u00ab Ces rats vieillissants e\u0301voluent spontane\u0301ment vers une re\u0301silience ou une vulne\u0301rabilite\u0301 cognitive \u00bb, souligne Jean-Christophe Delpech. L\u2019e\u0301quipe de chercheurs sait par ailleurs pre\u0301dire de\u0300s l\u2019a\u0302ge adulte, en absence de trouble de la me\u0301moire, la trajectoire de vulne\u0301rabilite\u0301 ou non des rats au cours du vieillissement. Gra\u0302ce a\u0300 la bourse du Prix Desmarest, les chercheurs espe\u0300rent trouver les deux a\u0300 cinq prote\u0301ines les plus pre\u0301dictives de cette trajectoire \u2013 l\u2019ide\u0301al pour constituer un biomarqueur fiable -, et ce de\u0300s l\u2019atteinte de l\u2019a\u0302ge adulte chez les rats. Parmi les candidates, plusieurs sont implique\u0301es dans la neuroinflammation, tre\u0300s importante dans le vieillissement cognitif.<\/p>\n<p>En paralle\u0300le, des re\u0301sultats chez l\u2019humain sont e\u0301galement sur le point d\u2019e\u0302tre publie\u0301s. \u00ab Apre\u0300s un an de supple\u0301mentation nutritionnelle, leur me\u0301moire s\u2019ame\u0301liore sur certains aspects&#8230; Mais pas pour tous. Certains re\u0301pondent tre\u0300s bien et pas d\u2019autres \u00bb, rapporte Jean-Christophe Delpech. \u00ab En creusant, nous nous sommes rendus compte que ces ve\u0301sicules extracellulaires pouvaient nous permettre de pre\u0301dire ceux qui y re\u0301pondent ! \u00bb L\u2019e\u0301quipe attend des premiers re\u0301sultats d\u2019ici 2027, avant de pouvoir ve\u0301rifier la pertinence de ses marqueurs d\u2019identification de trajectoire et de re\u0301ponse a\u0300 des approches nutritionnelles sur de plus grandes cohortes humaines. Avec a\u0300 la cle\u0301, ils l\u2019espe\u0300rent, un test sanguin pre\u0301dictif permettant de mettre en place des interventions correctives chez les personnes a\u0300 risque de basculer vers la neurode\u0301ge\u0301ne\u0301rescence. Mais pour cela il faudra attendre encore cinq a\u0300 dix ans.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; S\u00e3o Tom\u00e9 e Pr\u00edncipe. Tels des colis contenant des messages secrets, les ve\u0301sicules envoye\u0301es et rec\u0327ues par nos cellules pourraient nous informer sur la probabilite\u0301 de de\u0301velopper une maladie neurode\u0301ge\u0301ne\u0301rative dans le futur. \u00ab Les cellules libe\u0300rent volontairement ces ve\u0301sicules, qui en deviennent le miroir \u00bb, appuie le neuroscientifique Jean-Christophe Delpech, chercheur a\u0300 [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":25017,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[56],"class_list":["post-25018","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-sao-tome-e-principe"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Prise de Sang Pr\u00e9dictive pour Alzheimer et D\u00e9mences - 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