{"id":5110,"date":"2025-03-18T13:57:24","date_gmt":"2025-03-18T12:57:24","guid":{"rendered":"https:\/\/rvh-synergie.org\/actualites\/de-nouveaux-mecanismes-intercellulaires-peuvent-eclairer\/"},"modified":"2025-03-18T13:57:26","modified_gmt":"2025-03-18T12:57:26","slug":"de-nouveaux-mecanismes-intercellulaires-peuvent-eclairer","status":"publish","type":"post","link":"https:\/\/rvh-synergie.org\/actualites\/de-nouveaux-mecanismes-intercellulaires-peuvent-eclairer\/","title":{"rendered":"De nouveaux m\u00e9canismes intercellulaires peuvent \u00e9clairer"},"content":{"rendered":"<div>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2025\/novel-intercellular-me.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/hires\/2025\/novel-intercellular-me.jpg\" data-sub-html=\"Both DeltaC and DeltaD ligands are crucial for &lt;i&gt;her&lt;\/i&gt; transcription. Credit: &lt;i&gt;Nature Communications&lt;\/i&gt; (2025). DOI: 10.1038\/s41467-025-57645-5\">\n<figure class=\"article-img\">\n<\/figure><\/div>\n<\/div>\n<p>Les chercheurs de Northwestern Medicine ont identifi\u00e9 de nouveaux m\u00e9canismes r\u00e9gulant le d\u00e9veloppement de la colonne vert\u00e9brale pendant le d\u00e9veloppement embryonnaire, les r\u00e9sultats qui pourraient \u00e9clairer de nouveaux traitements pour la scoliose cong\u00e9nitale et d&rsquo;autres malformations cong\u00e9nitales connexes, selon une \u00e9tude r\u00e9cente publi\u00e9e dans <i>Communications de la nature<\/i>.<\/p>\n<p>La colonne vert\u00e9brale de toutes les esp\u00e8ces de vert\u00e9br\u00e9s, y compris les humains, est divis\u00e9e en segments (disques vert\u00e9braux), qui donnent \u00e0 la colonne vert\u00e9brale \u00e0 la fois la flexibilit\u00e9 et la mobilit\u00e9.<\/p>\n<p>Au cours du d\u00e9veloppement embryonnaire pr\u00e9coce, ces disques se d\u00e9veloppent \u00e0 partir de cellules sp\u00e9cialis\u00e9es appel\u00e9es somites et sont s\u00e9quentiellement \u00ab\u00a0tranch\u00e9es\u00a0\u00bb en disques s\u00e9par\u00e9s, un processus entra\u00een\u00e9 par une horloge biologique appel\u00e9e horloge de segmentation des vert\u00e9br\u00e9s.<\/p>\n<p>\u00ab\u00a0Il s&rsquo;agit d&rsquo;une segmentation s\u00e9quentielle et d&rsquo;une segmentation p\u00e9riodique, et l&rsquo;horloge se r\u00e9f\u00e8re \u00e0 certains g\u00e8nes qui expriment l&rsquo;ARN et les prot\u00e9ines. Ces expressions ne se produisent pas toujours constamment; elles se produisent en oscillations, comme les vagues\u00a0\u00bb, a d\u00e9clar\u00e9 Ertugrul \u00d6zbudak, Ph.D., The Robert Laughlin Rea professeur de biologie cellulaire au D\u00e9partement de la biologie cellulaire et du d\u00e9veloppement et de l&rsquo;auteur principal de l&rsquo;\u00e9tude.<\/p>\n<p>Chaque cellule Somite contient deux prot\u00e9ines d&rsquo;horloge, HER1 et HER7, qui aident \u00e0 r\u00e9guler l&rsquo;horloge de segmentation des vert\u00e9br\u00e9s. En parall\u00e8le, les prot\u00e9ines deltac et deltad activent la voie de signalisation de l&rsquo;encoche, qui \u00e0 son tour active la transcription des g\u00e8nes d&rsquo;horloge dans les cellules pr\u00e9omiques voisines.<\/p>\n<p>Les mutations de ces g\u00e8nes de voie entra\u00eenent des d\u00e9fauts de segmentation vert\u00e9brale chez l&rsquo;homme, comme la scoliose cong\u00e9nitale.<\/p>\n<p>\u00ab\u00a0Il y a une action collective. Des centaines de cellules produisent et d\u00e9gradent de mani\u00e8re synchrone ces mol\u00e9cules et cela n\u00e9cessite une communication cellulaire \u00e0 cellule\u00a0\u00bb, a d\u00e9clar\u00e9 \u00d6zbudak.<\/p>\n<p>Des travaux ant\u00e9rieurs avaient sugg\u00e9r\u00e9 qu&rsquo;un seul de ces ligands, Deltac, a contribu\u00e9 \u00e0 la transcription des g\u00e8nes de l&rsquo;horloge de segmentation.<\/p>\n<p>Pour mieux comprendre comment Deltac et Deltad influencent la transcription des g\u00e8nes de l&rsquo;horloge de segmentation des vert\u00e9br\u00e9s HER1 et HER7, l&rsquo;\u00e9quipe d&rsquo;\u00d6zbudak a effectu\u00e9 une imagerie avanc\u00e9e sur diff\u00e9rents arri\u00e8re-plans g\u00e9n\u00e9tiques d&#8217;embryons de poisson z\u00e8bre.<\/p>\n<p>\u00c9tonnamment, ils ont constat\u00e9 que Deltad \u00e9tait non seulement fonctionnel, mais aussi que la signalisation Notch favorise la transcription des g\u00e8nes deltac et deltad.<\/p>\n<p>\u00ab\u00a0Deltac oscille et contribue imm\u00e9diatement \u00e0 la synchronisation. Deltad n&rsquo;oscille pas, mais \u00e9l\u00e8ve les niveaux du g\u00e8ne cible afin qu&rsquo;ils puissent \u00eatre capables d&rsquo;osciller et de synchroniser\u00a0\u00bb, a d\u00e9clar\u00e9 \u00d6zbudak.<\/p>\n<p>Les r\u00e9sultats aideront \u00e0 am\u00e9liorer la compr\u00e9hension des raisons pour lesquelles ces deux mutations g\u00e9n\u00e9tiques entra\u00eenent des anomalies cong\u00e9nitales de la colonne vert\u00e9brale et \u00e9clairent les travaux futurs pour identifier de nouvelles strat\u00e9gies th\u00e9rapeutiques, a ajout\u00e9 \u00d6zbudak.<\/p>\n<p>\u00ab\u00a0Dans un avenir proche, nous visons \u00e0 \u00e9valuer les contributions d&rsquo;autres r\u00e9gulateurs de transcription et d&rsquo;autres m\u00e9canismes de signalisation cellulaire\u00a0\u00bb, a conclu \u00d6zbudak.<\/p>\n<p>                                        <!-- print only --><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Les chercheurs de Northwestern Medicine ont identifi\u00e9 de nouveaux m\u00e9canismes r\u00e9gulant le d\u00e9veloppement de la<\/p>\n","protected":false},"author":1,"featured_media":5111,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[2410,4514,3226,992,92],"class_list":["post-5110","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-maladies","tag-eclairer","tag-intercellulaires","tag-mecanismes","tag-nouveaux","tag-peuvent","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 - 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