{"id":1091,"date":"2024-07-22T16:44:10","date_gmt":"2024-07-22T14:44:10","guid":{"rendered":"https:\/\/www.uni.lu\/lcsb-fr\/?page_id=1091"},"modified":"2024-07-31T14:47:55","modified_gmt":"2024-07-31T12:47:55","slug":"cellules-nerveuses","status":"publish","type":"page","link":"https:\/\/www.uni.lu\/lcsb-fr\/recherche\/recherche-animale\/exemples-projets-recherche\/cellules-nerveuses\/","title":{"rendered":"Ce que des centaines de biomol\u00e9cules nous apprennent sur nos cellules nerveuses"},"content":{"rendered":"<div class=\"section py-0 static\">\n<section class=\"py-0 wp-block-unilux-blocks-free-section section\"><div class=\"container xl:max-w-screen-xl\"><!-- SecondaryNavigationMirror --><div class=\"js-secondary-nav--sticky wp-block-unilux-blocks-secondary-navigation\" id=\"079cacee-a280-4f42-8b0f-7a37a67d3516\">\n    <nav id=\"secondary-navigation\" role=\"navigation\" aria-label=\"Secondary menu\" class=\"secondary-nav\">\n        <button class=\"secondary-nav__button btn 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class=\"has-text-align-left wp-block-unilux-blocks-heading\"        id=\"ce-que-des-centaines-de-biomolecules-nous-apprennent-sur-nos-cellules-nerveuses\"\n    >\nCe que des centaines de biomol\u00e9cules nous apprennent sur nos cellules nerveuses<\/h2>\n\n\n\n<p>Le cerveau des mammif\u00e8res est une structure complexe, compos\u00e9e de r\u00e9gions interagissant entre elles et assurant des fonctions extr\u00eamement sp\u00e9cialis\u00e9es, telles que la cognition, les fonctions motrices, les \u00e9motions et le traitement des informations. Chaque r\u00e9gion contient des millions, parfois m\u00eame des milliards de neurones et de cellules gliales de diff\u00e9rents types, comme des astrocytes, des oligodendrocytes et des cellules microgliales. Ensemble, ces cellules orchestrent les fonctions c\u00e9r\u00e9brales. Pour fonctionner correctement, les connexions entre les diff\u00e9rentes r\u00e9gions sont essentielles pour transmettre des informations sp\u00e9cifiques et d\u00e9clencher certains comportements. Le nombre de connexions cellulaires entre les neurones d\u2019un cerveau humain est estim\u00e9 \u00e0 plus de 100\u00a0billions. L\u2019\u00e9norme complexit\u00e9 des \u00e9l\u00e9ments du cerveau nous oblige \u00e0 \u00e9tudier les processus pathologiques, comme ceux de la maladie d\u2019Alzheimer ou de Parkinson, dans le cerveau dans son ensemble, en utilisant des\u00a0animaux mod\u00e8les.<\/p>\n\n\n\n<p>Les processus neurod\u00e9g\u00e9n\u00e9ratifs tels que ceux observ\u00e9s dans la maladie de Parkinson se caract\u00e9risent par des alt\u00e9rations pathologiques dans les cellules c\u00e9r\u00e9brales, souvent localis\u00e9es dans des zones sp\u00e9cifiques du cerveau\u00a0: ces cellules perdent leur structure et leur fonction, et donc leur connectivit\u00e9, un processus souvent accompagn\u00e9 de changements dans leur m\u00e9tabolisme. Jusqu\u2019\u00e0 pr\u00e9sent, la plupart des scientifiques se concentraient sur un seul ou quelques-uns des aspects de la maladie afin de mieux d\u00e9crire et comprendre les m\u00e9canismes sous-jacents.<\/p>\n\n\n\n<p>Les chercheurs du Luxembourg Centre for Systems Biomedicine (LCSB) de l\u2019Universit\u00e9 du Luxembourg ont r\u00e9cemment entrepris d\u2019adopter une approche plus globale\u00a0: ils ont analys\u00e9 le m\u00e9tabolome, l\u2019ensemble de centaines de petites biomol\u00e9cules qu\u2019on appelle les m\u00e9tabolites, produit par les cellules nerveuses dans diff\u00e9rentes r\u00e9gions du cerveau de souris. Au cours de ce processus, ils ont \u00e9tudi\u00e9 des cerveaux sains, mais aussi des cerveaux atteints de neurod\u00e9g\u00e9n\u00e9rescence.<\/p>\n\n\n\n<p>Capturer l\u2019anatomie tridimensionnelle du cerveau est cruciale pour cr\u00e9er cet aper\u00e7u instantan\u00e9 de sa physiologie, ce qui exclut les exp\u00e9riences men\u00e9es en culture cellulaire ou sur des organismes moins complexes, tels que la levure ou des n\u00e9matodes. Chez l\u2019Homme, de telles \u00e9tudes ne peuvent \u00eatre r\u00e9alis\u00e9es que sur des tissus post mortem de personnes ayant fait don de leur cerveau. L&rsquo;\u00e9tude des changements m\u00e9taboliques dus \u00e0 la neurod\u00e9g\u00e9n\u00e9rescence au fil du temps, comme c&rsquo;est le cas dans cette \u00e9tude, ne serait pas possible. Le cerveau de la souris \u00e9tant structurellement similaire \u00e0 celui de l&rsquo;humain, les chercheurs s&rsquo;attendent \u00e0 trouver des diff\u00e9rences m\u00e9taboliques similaires dans le cerveau de patients.<\/p>\n\n\n\n<p>Les chercheurs ont diss\u00e9qu\u00e9 des r\u00e9gions sup\u00e9rieures, moyennes et inf\u00e9rieures du cerveau de souris atteintes de diff\u00e9rents stades de neurod\u00e9g\u00e9n\u00e9rescence induite par l\u2019injection d\u2019une neurotoxine. Pour \u00e9tudier les signatures m\u00e9taboliques du cerveau, ils ont utilis\u00e9 la chromatographie en phase gazeuse coupl\u00e9e \u00e0 la spectrom\u00e9trie de masse. Ces techniques de chimie analytique sont particuli\u00e8rement adapt\u00e9es \u00e0 l\u2019analyse d\u2019\u00e9chantillons provenant de tissus complexes et \u00e0 la d\u00e9couverte de biomol\u00e9cules connues et encore inconnues dans ces tissus.<\/p>\n\n\n\n<p>Apr\u00e8s avoir effectu\u00e9 ces mesures, les chercheurs ont utilis\u00e9 une approche bioinformatique d\u2019apprentissage automatique (Machine learning) pour \u00e9tablir le profil m\u00e9tabolique sp\u00e9cifiquement de chaque r\u00e9gion du cerveau.\u00a0Ils ont d\u00e9couvert que certaines combinaisons de mol\u00e9cules diff\u00e9rentes refl\u00e8tent des \u00e9tats fonctionnels sp\u00e9cifiques des cellules nerveuses dans chaque r\u00e9gion du cerveau. En comparant leurs observations \u00e0 l&rsquo;analyse microscopique des processus pathologiques dans les cellules nerveuses, les chercheurs du LCSB ont pu montrer quel profil m\u00e9tabolique particulier est associ\u00e9 \u00e0 la d\u00e9g\u00e9n\u00e9rescence de ces cellules.<\/p>\n\n\n\n<p>\u00ab Nos observations sont importantes, d&rsquo;une part, pour ouvrir la voie \u00e0 la d\u00e9couverte de nouvelles m\u00e9thodes de diagnostic de la neurod\u00e9g\u00e9n\u00e9rescence et, d&rsquo;autre part, pour le d\u00e9veloppement de nouveaux m\u00e9dicaments destin\u00e9s \u00e0 lutter contre la maladie de Parkinson ou la maladie d&rsquo;Alzheimer&nbsp;\u00bb, explique le Dr Manuel Buttini, responsable de l&rsquo;\u00e9tude de neuropathologie. \u00ab&nbsp;L&rsquo;analyse des profils de m\u00e9tabolites plut\u00f4t que des changements cellulaires microscopiques ou des biomol\u00e9cules individuelles peut permettre de mieux comprendre l&rsquo;effet des nouvelles th\u00e9rapies pour les maladies du cerveau.&nbsp;\u00bb<\/p>\n\n\n\n<p>Cette \u00e9tude a b\u00e9n\u00e9fici\u00e9 des efforts conjoints d&rsquo;experts de domaines tr\u00e8s diff\u00e9rents : la neurobiologie de la souris, la biochimie, la biologie mol\u00e9culaire et la bio-informatique se sont unies pour permettre de mener cette \u00e9tude. Elle a \u00e9t\u00e9 publi\u00e9e dans l&rsquo;American Journal of Pathology.La plateforme de neuropathologie du LCSB travaille en \u00e9troite collaboration avec la plateforme des rongeurs. Ensemble, elles apportent leur expertise pour \u00e9tudier les changements pathologiques aux niveaux macroscopique, microscopique et mol\u00e9culaire dans les mod\u00e8les murins de la maladie de Parkinson et de la maladie d&rsquo;Alzheimer.<\/p>\n<\/div><\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":39,"featured_media":0,"parent":1078,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"featured_image_focal_point":[],"show_featured_caption":false,"ulux_newsletter_groups":"","uluxPostTitle":"","uluxPrePostTitle":"","_trash_the_other_posts":false,"_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"footnotes":""},"field-of-interest":[289],"organisation":[526,525],"authorship":[39,56],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.3 (Yoast SEO v22.3) - 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