{"id":6946,"date":"2025-06-01T10:56:55","date_gmt":"2025-06-01T08:56:55","guid":{"rendered":"https:\/\/rvh-synergie.org\/actualites\/le-modele-tout-en-un-reconstruit-larchitecture-hepatique-complexe\/"},"modified":"2025-06-01T10:56:57","modified_gmt":"2025-06-01T08:56:57","slug":"le-modele-tout-en-un-reconstruit-larchitecture-hepatique-complexe","status":"publish","type":"post","link":"https:\/\/rvh-synergie.org\/actualites\/le-modele-tout-en-un-reconstruit-larchitecture-hepatique-complexe\/","title":{"rendered":"Le mod\u00e8le tout-en-un reconstruit l&rsquo;architecture h\u00e9patique complexe"},"content":{"rendered":"<div>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2025\/all-in-one-model-recon.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/2025\/all-in-one-model-recon.jpg\" data-sub-html=\"Periportal assembloid, with the three component cell types visualized: cholangiocytes in pink, portal fibroblasts in green, and hepatocyte nuclei in blue; all cell borders are visualized in white. Credit: Anna M. Dowbaj, Aleksandra Sljukic et al. Nature (2025) \/ MPI-CBG\">\n<figure class=\"article-img\">\n<\/figure><\/div>\n<\/div>\n<p>Le foie a une structure unique, en particulier au niveau des cellules individuelles. Les h\u00e9patocytes, les principales cellules h\u00e9patiques, lib\u00e8rent la bile dans de minuscules canaux appel\u00e9s canaliculi biliaires, qui s&rsquo;\u00e9coulent dans le canal biliaire dans la r\u00e9gion p\u00e9riportale du foie. Lorsque ce syst\u00e8me de drainage biliaire est perturb\u00e9, il provoque des l\u00e9sions h\u00e9patiques et des maladies.<\/p>\n<p>En raison de cette architecture unique, l&rsquo;enqu\u00eate sur les maladies du foie a \u00e9t\u00e9 limit\u00e9e par le manque de mod\u00e8les cultiv\u00e9s en laboratoire qui montrent avec pr\u00e9cision comment la maladie progresse, car il est difficile de recr\u00e9er la structure complexe du foie et les interactions cellulaires dans un plat. Les mod\u00e8les organo\u00efdes h\u00e9patiques d\u00e9riv\u00e9s des tissus existants sont constitu\u00e9s d&rsquo;un seul type de cellule et ne reproduisent pas la composition cellulaire complexe et l&rsquo;architecture tissulaire, comme la r\u00e9gion p\u00e9riportale h\u00e9patique.<\/p>\n<p>The research group of Meritxell Huch, director at the Max Planck Institute of Molecular Cell Biology and Genetics (MPI-CBG) in Dresden, Germany, began to address this issue in a study in 2021, in which they developed a liver organoid consisting of two cell types, cholangiocyte and mesenchyme cells, that could model cell\u2013cell interactions and cell arrangement, but still lacked other periportal cell Types &#8211; Surtout, h\u00e9patocytes, la cellule qui construit la majorit\u00e9 de la masse h\u00e9patique.<\/p>\n<h2>Cr\u00e9ation d&rsquo;un mod\u00e8le organo\u00efde de nouvelle g\u00e9n\u00e9ration<\/h2>\n<p>Dans une \u00e9tude actuelle, publi\u00e9e dans <i>Nature<\/i>des chercheurs du groupe de Meritxell Huch, ainsi que des coll\u00e8gues des groupes de Marino Zerial et Heather Harrington, tous deux \u00e9galement directeurs du MPI-CBG, ont pu d\u00e9velopper un mod\u00e8le organo\u00efde de nouvelle g\u00e9n\u00e9ration, qu&rsquo;ils ont nomm\u00e9 \u00ab\u00a0assemblo\u00efd p\u00e9riportal\u00a0\u00bb.<\/p>\n<p>Cet assemblo\u00efde pr\u00e9sente des cholangiocytes adultes et des cellules m\u00e9senchymateuses h\u00e9patiques (comme dans le mod\u00e8le pr\u00e9c\u00e9dent), mais comprend d\u00e9sormais \u00e9galement des h\u00e9patocytes, qui sont les principales cellules fonctionnelles du foie adulte. Ce mod\u00e8le combine diff\u00e9rentes cellules assembl\u00e9es ensemble dans un processus pas \u00e0 pas que l&rsquo;on pourrait comparer \u00e0 LEGO.<\/p>\n<p>\u00ab\u00a0Notre assemblo\u00efd reconstruit la r\u00e9gion p\u00e9riportale h\u00e9patique et peut mod\u00e9liser les aspects des l\u00e9sions h\u00e9patiques cholestatiques et de la fibrose biliaire. Nous avons choisi cette r\u00e9gion en particulier car il joue un r\u00f4le cl\u00e9 dans le transport de la bile et est souvent perturb\u00e9 dans les maladies du foie lorsque la connexion des cellules responsables du transport de la bile est bloqu\u00e9e\u00a0\u00bb, a d\u00e9clar\u00e9 Anna Dowbaul, et de Juin 20 Nomm\u00e9 professeur adjoint \u00e0 l&rsquo;Universit\u00e9 technique de Munich (TUM).<\/p>\n<p>\u00ab\u00a0Pour atteindre notre objectif, nous avons d&rsquo;abord cr\u00e9\u00e9 des organo\u00efdes constitu\u00e9s uniquement d&rsquo;h\u00e9patocytes qui formaient des canaux biliaires de travail et maintenaient des caract\u00e9ristiques cl\u00e9s de r\u00e9els h\u00e9patocytes dans les tissus. Ensuite, nous avons ajout\u00e9 des cholangiocytes et des cellules fibroblastiques pour construire Interactions entre les diff\u00e9rentes cellules h\u00e9patiques \u00ab\u00a0, explique Aleksandra Sljukic, \u00e9galement premier auteur de l&rsquo;\u00e9tude et un doctorant dans le groupe Huch.<\/p>\n<p>En manipulant le nombre de cellules m\u00e9senchymateuses, les chercheurs ont pu d\u00e9clencher une r\u00e9ponse similaire \u00e0 la fibrose h\u00e9patique. Ils ont \u00e9galement pu montrer que ce mod\u00e8le peut \u00eatre utilis\u00e9 pour \u00e9tudier les r\u00f4les de g\u00e8nes sp\u00e9cifiques dans la maladie du foie en m\u00e9langeant des cellules normales et mut\u00e9es ou en \u00e9teignant les g\u00e8nes.<\/p>\n<p>En utilisant l&rsquo;analyse des donn\u00e9es topologiques, Heather Harrington et ses coll\u00e8gues de l&rsquo;Universit\u00e9 d&rsquo;Oxford ont class\u00e9 les formes des assemblo\u00efdes et ont constat\u00e9 que certaines formes \u00e9taient en corr\u00e9lation avec une meilleure fonction h\u00e9patique au fil du temps.<\/p>\n<h2>\u00c9tudier les maladies du foie et une vision future<\/h2>\n<p>Meritxell Huch, qui a supervis\u00e9 et supervis\u00e9 l&rsquo;\u00e9tude, conclut: \u00ab\u00a0Nous sommes ravis que nous ayons pu cr\u00e9er un mod\u00e8le assemblo\u00efde p\u00e9riportal qui combine pour la premi\u00e8re fois, bien que certaines cellules soient toujours manquantes, de la fin de l&rsquo;architecture endoth\u00e9lium et des cellules immine zone p\u00e9riportale \u00e0 l&rsquo;\u00e9chelle d&rsquo;une bo\u00eete de culture tissulaire.<\/p>\n<p>\u00ab\u00a0De plus, ses caract\u00e9ristiques modulaires permettent d&rsquo;\u00eatre facilement \u00e9tudi\u00e9e, manipul\u00e9e et manipul\u00e9e dans le laboratoire. Nos assemblo\u00efdes h\u00e9patiques sont le premier mod\u00e8le de laboratoire tout-en-un qui peut \u00eatre utilis\u00e9 pour \u00e9tudier le flux de la bile, la l\u00e9sion des canaux biliaires et la fa\u00e7on dont diff\u00e9rentes cellules h\u00e9patiques contribuent \u00e0 la maladie.<\/p>\n<p>\u00ab\u00a0Nous envisageons que nos mod\u00e8les h\u00e9patiques p\u00e9riportaux peuvent finalement \u00eatre utilis\u00e9s pour \u00e9tudier les m\u00e9canismes de la maladie. Une fois traduit en cellules humaines, il pourrait \u00eatre un moyen de passer des mod\u00e8les 2D utilis\u00e9s dans les d\u00e9pistages pharmaceutiques \u00e0 des mod\u00e8les 3D plus physiologiques pour \u00e9tudier l&rsquo;efficacit\u00e9 des m\u00e9dicaments et la toxicit\u00e9 dans un contexte plus physiologiquement pertinent.\u00a0\u00bb<\/p>\n<p>                                        <!-- print only --><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Le foie a une structure unique, en particulier au niveau des cellules individuelles. Les h\u00e9patocytes,<\/p>\n","protected":false},"author":1,"featured_media":6947,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[2188,655,5523,1047,5522,5521],"class_list":["post-6946","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-maladies","tag-complexe","tag-hepatique","tag-larchitecture","tag-modele","tag-reconstruit","tag-toutenun","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Le mod\u00e8le tout-en-un reconstruit l&#039;architecture h\u00e9patique complexe - RVH-Synergie.org<\/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:\/\/rvh-synergie.org\/actualites\/le-modele-tout-en-un-reconstruit-larchitecture-hepatique-complexe\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le mod\u00e8le tout-en-un reconstruit l&#039;architecture h\u00e9patique complexe - RVH-Synergie.org\" \/>\n<meta property=\"og:description\" content=\"Le foie a une structure unique, en particulier au niveau des cellules individuelles. 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