{"id":60211,"date":"2018-07-03T16:53:38","date_gmt":"2018-07-03T16:53:38","guid":{"rendered":""},"modified":"2018-07-03T16:53:38","modified_gmt":"2018-07-03T16:53:38","slug":"renverser-le-mecanisme-biologique-qui-conduit-a-lalzheimer","status":"publish","type":"post","link":"https:\/\/harissa.com\/news-wp\/renverser-le-mecanisme-biologique-qui-conduit-a-lalzheimer\/","title":{"rendered":"Renverser le m\u00e9canisme biologique qui conduit \u00e0 l\u2019Alzheimer"},"content":{"rendered":"<p>Renverser le m\u00e9canisme biologique qui conduit \u00e0 l\u2019Alzheimer<\/p>\n<p>Des chercheurs de l\u2019Universit\u00e9 de Tel-Aviv ont identifi\u00e9 un moyen de renverser le m\u00e9canisme biologique qui conduit \u00e0 l\u2019Alzheimer<\/p>\n<p>Le Prof. Martin Kupiec et le Dr. Kobi Simpson-Lavy de l\u2019\u00c9cole de biologie mol\u00e9culaire et de biotechnologie de l\u2019Universit\u00e9 de Tel-Aviv ont identifi\u00e9 une prot\u00e9ine susceptible de subir un processus de transformation biologique inverse \u00e0 celui qui aboutit \u00e0 la perte des fonctions c\u00e9r\u00e9brales. Les chercheurs esp\u00e8rent que cette \u00e9tude r\u00e9volutionnaire pourra contribuer dans l\u2019avenir au traitement de maladies telles que le diab\u00e8te, la maladie d\u2019Alzheimer et celle de Parkinson.<\/p>\n<p>Les r\u00e9sultats de la recherche ont \u00e9t\u00e9 publi\u00e9s \u00e0 la fin de la semaine derni\u00e8re dans la revue&nbsp;<em>Molecular Cell<\/em>.<\/p>\n<p>Le processus de formation d\u2019agr\u00e9gats de prot\u00e9ines dans les cellules, qui caract\u00e9risent les maladies neuro-d\u00e9g\u00e9n\u00e9ratives du cerveau telles que la maladie d\u2019Alzheimer \u00e9tait jusqu\u2019\u00e0 pr\u00e9sent consid\u00e9r\u00e9 comme irr\u00e9versible. Dans leur nouvelle \u00e9tude, les chercheurs ont identifi\u00e9 une prot\u00e9ine du nom de Std1 dont le processus d\u2019accumulation est susceptible de s\u2019inverser lorsque ses conditions d\u2019environnement se transforment.<\/p>\n<p><strong>Un processus r\u00e9versible<\/strong>&nbsp;<\/p>\n<p>\u201d Avec l\u2019\u00e2ge des amas de prot\u00e9ines ou agr\u00e9gats se forment dans les cellules\u201d, explique le Dr. Kobi Simpson-Lavy qui a men\u00e9 l\u2019\u00e9tude dans le laboratoire de recherche du Prof. Kupiec. \u201cCes blocs se cr\u00e9ent pour de nombreuses raisons, et le processus est consid\u00e9r\u00e9 comme irr\u00e9versible. Il s\u2019agit d\u2019un ph\u00e9nom\u00e8ne typique d\u2019un certain nombre de maladies graves, en particulier des maladies caract\u00e9ris\u00e9es par une perte de la fonction c\u00e9r\u00e9brale \u201c.<\/p>\n<p>En r\u00e8gle g\u00e9n\u00e9rale, la plupart des processus dans nos cellules sont effectu\u00e9s par des prot\u00e9ines. En temps normal, il s\u2019agit de mol\u00e9cules solubles qui peuvent se d\u00e9placer d\u2019un endroit \u00e0 l\u2019autre de la cellule. Les agr\u00e9gats de prot\u00e9ines interf\u00e8rent avec cette capacit\u00e9 et sont responsables d\u2019un certain nombre de maladies, telles que le diab\u00e8te, la maladie d\u2019Alzheimer, la maladie de Parkinson et l\u2019enc\u00e9phalopathie spongiforme bovine (maladie de la \u201cvache folle\u201d). Pour minimiser ces interf\u00e9rences, la cellule tente de \u201cd\u00e9sassembler\u201d ces blocs ou de les empiler dans certains emplacements.<\/p>\n<p>Pour les besoins de la nouvelle \u00e9tude, le Dr. Simpson-Lavy a examin\u00e9 la r\u00e9ponse des cellules de levure \u00e0 la pr\u00e9sence de sucres. Il a constat\u00e9 que l\u2019ajout de glucose au substrat de croissance provoquait l\u2019empilement d\u2019une prot\u00e9ine nomm\u00e9e STD1.<\/p>\n<p>\u201cNous nous sommes demand\u00e9s si les blocs de Std1 avaient un r\u00f4le physiologique\u201d, explique le Prof. Kupiec. \u201d Nous avons donc suivi l\u2019\u00e9volution de ces cellules et constat\u00e9 que lorsque les niveaux de glucose diminuaient, les blocs disparaissaient et la prot\u00e9ine STD1 revenait vers son emplacement naturel dans le noyau, o\u00f9 se trouve le g\u00e9nome de la cellule. En raison du r\u00f4le cl\u00e9 de la STD1 dans la r\u00e9action \u00e0 la pr\u00e9sence de sucres divers dans le substrat de croissance, nous faisons l\u2019hypoth\u00e8se que son agr\u00e9gation r\u00e9versible est un m\u00e9canisme de contr\u00f4le qui permet aux cellules de r\u00e9agir avec rapidit\u00e9 \u00e0 la variation des niveaux de sucre dans l\u2019environnement de l\u2019agr\u00e9gat\u201d.<\/p>\n<p>La formation des agr\u00e9gats de la prot\u00e9ine Std1 d\u00e9pend des m\u00eames syst\u00e8mes cellulaires que ceux qui conduisent aux maladies neuro-d\u00e9g\u00e9n\u00e9ratives du cerveau. Ainsi, les chercheurs ont-ils d\u00e9couvert un nouveau m\u00e9canisme biologique de r\u00e9gulation de l\u2019activit\u00e9 des g\u00e8nes qui aboutit \u00e0 une r\u00e9version du processus d\u2019agr\u00e9gation suite \u00e0 des changements des conditions environnementales. L\u2019\u00e9tude sugg\u00e8re que toutes les accumulations de prot\u00e9ines ne provoquent pas n\u00e9cessairement une maladie et qu\u2019il est peut-\u00eatre possible de transformer un agr\u00e9gat irr\u00e9versible en agr\u00e9gat r\u00e9versible.<\/p>\n<p>\u201cCes r\u00e9sultats nous encouragent \u00e0 continuer d\u2019explorer le m\u00e9canisme, afin de mieux comprendre les voies du d\u00e9mant\u00e8lement des blocs de prot\u00e9ines \u201c, conclut le Prof. Kupiec. \u201cCette recherche est susceptible de permettre le d\u00e9veloppement de futurs traitements des maladies neurod\u00e9g\u00e9n\u00e9ratives et d\u2019autres affections\u201d.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Renverser le m\u00e9canisme biologique qui conduit \u00e0 l\u2019Alzheimer Des chercheurs de l\u2019Universit\u00e9 de Tel-Aviv ont identifi\u00e9 un moyen de renverser le m\u00e9canisme biologique qui conduit \u00e0 l\u2019Alzheimer Le Prof. Martin Kupiec et le Dr. Kobi Simpson-Lavy de l\u2019\u00c9cole de biologie mol\u00e9culaire et de biotechnologie de l\u2019Universit\u00e9 de Tel-Aviv ont identifi\u00e9 une prot\u00e9ine susceptible de subir&hellip;&nbsp;<\/p>\n","protected":false},"author":1,"featured_media":60212,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-60211","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Renverser le m\u00e9canisme biologique qui conduit \u00e0 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