{"id":5700,"date":"2025-04-11T22:56:46","date_gmt":"2025-04-11T20:56:46","guid":{"rendered":"https:\/\/rvh-synergie.org\/actualites\/la-modification-des-proteines-immunitaires-peut-limiter-la-replication-virale-et-linflammation-cardiaque\/"},"modified":"2025-04-11T22:56:47","modified_gmt":"2025-04-11T20:56:47","slug":"la-modification-des-proteines-immunitaires-peut-limiter-la-replication-virale-et-linflammation-cardiaque","status":"publish","type":"post","link":"https:\/\/rvh-synergie.org\/actualites\/la-modification-des-proteines-immunitaires-peut-limiter-la-replication-virale-et-linflammation-cardiaque\/","title":{"rendered":"La modification des prot\u00e9ines immunitaires peut limiter la r\u00e9plication virale et l&rsquo;inflammation cardiaque"},"content":{"rendered":"<div>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2025\/study-finds-immune-pro.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/hires\/2025\/study-finds-immune-pro.jpg\" data-sub-html=\"Validation of MDA5&lt;sup&gt; K23R\/K43R&lt;\/sup&gt; mice and functional assessment of MDA5 oligomerization in cells derived from these mice. Credit: &lt;i&gt;Proceedings of the National Academy of Sciences&lt;\/i&gt; (2025). DOI: 10.1073\/pnas.2420190122\">\n<figure class=\"article-img\">\n<\/figure><\/div>\n<\/div>\n<p>Les chercheurs en virologie de la clinique de Cleveland ont d\u00e9couvert qu&rsquo;une modification sp\u00e9cifique des prot\u00e9ines de la prot\u00e9ine immunitaire MDA5 est la cl\u00e9 de la fa\u00e7on dont les corps humains d\u00e9tectent et r\u00e9pondent aux virus et \u00e0 la r\u00e9plication virale.<\/p>\n<p>Le <i>Actes de l&rsquo;Acad\u00e9mie nationale des sciences<\/i> La publication explique comment deux modifications des prot\u00e9ines activent le MDA5, une prot\u00e9ine immunitaire essentielle, pour d\u00e9tecter les envahisseurs, limiter la r\u00e9plication virale et lutter contre les infections. Ce processus est essentiel pour pr\u00e9venir les r\u00e9sultats comme l&rsquo;inflammation cardiaque induite par le virus.<\/p>\n<p>Cette publication la plus r\u00e9cente s&rsquo;appuie sur un ensemble d&rsquo;\u0153uvres du laboratoire de Michaela Gack, Ph.D., directeur scientifique du Cleveland Clinic&rsquo;s Florida Research &#038; Innovation Center, qui cherche \u00e0 am\u00e9liorer notre compr\u00e9hension de la fa\u00e7on dont les corps d\u00e9tectent les virus. L&rsquo;objectif \u00e0 long terme de l&rsquo;\u00e9quipe est de traduire potentiellement ces r\u00e9sultats en traitements antiviraux qui peuvent lutter contre plusieurs virus.<\/p>\n<p>Les modifications des prot\u00e9ines sont des mol\u00e9cules suppl\u00e9mentaires ou des groupes chimiques ajout\u00e9s \u00e0 une prot\u00e9ine apr\u00e8s sa r\u00e9alisation. Les g\u00e8nes fournissent des instructions pour cr\u00e9er des prot\u00e9ines mol\u00e9cule par mol\u00e9cule, mais la mol\u00e9cule n&rsquo;est pas termin\u00e9e une fois ce processus termin\u00e9.<\/p>\n<p>Les enzymes cellulaires ajoutent ensuite de nouvelles pi\u00e8ces \u00e0 la prot\u00e9ine pour les configurer pour certaines fonctions ou signaler la prot\u00e9ine pour la destruction. Ces modifications des prot\u00e9ines permettent \u00e0 notre corps de r\u00e9guler certains processus &#8211; ou de les arr\u00eater compl\u00e8tement.<\/p>\n<p>MDA5 est une prot\u00e9ine impliqu\u00e9e dans la toute premi\u00e8re \u00e9tape de la fa\u00e7on dont les corps humains d\u00e9tectent les virus. Il existe des sites sp\u00e9cifiques dans MDA5 o\u00f9 la modification des prot\u00e9ines se produit dans le cadre de la premi\u00e8re \u00e9tape de la r\u00e9ponse \u00e0 un virus. Une petite prot\u00e9ine appel\u00e9e ISG15 s&rsquo;attache \u00e0 ces sites &#8211; un processus appel\u00e9 Isgylation, explique le premier auteur de l&rsquo;\u00e9tude, Lucky Sarkar, Ph.D., chercheur postdoctoral dans le laboratoire du Dr Gack.<\/p>\n<p>Pour explorer \u00e0 quel point cette modification sp\u00e9cifique des prot\u00e9ines est critique \u00e0 la d\u00e9tection des virus, les chercheurs ont travaill\u00e9 avec la Case Western Reserve Transgenic and Cibunting Facility pour cr\u00e9er un mod\u00e8le pr\u00e9clinique h\u00e9bergeant une version de MDA5 qui manquait des sites n\u00e9cessaires pour se fixer \u00e0 ISG15.<\/p>\n<p>\u00ab\u00a0L&rsquo;\u00e9limination de la capacit\u00e9 de la prot\u00e9ine \u00e0 \u00eatre modifi\u00e9e avait presque le m\u00eame effet que le supprimer compl\u00e8tement\u00a0\u00bb, a d\u00e9clar\u00e9 le Dr Sarkar. \u00ab\u00a0Les donn\u00e9es d\u00e9montrent que la modification ISG15 de MDA5 est essentielle pour activer l&rsquo;immunit\u00e9 inn\u00e9e &#8211; notre premi\u00e8re ligne de d\u00e9fense de l&rsquo;organisme.\u00a0\u00bb<\/p>\n<p>Sans Isgylation MDA5, les mod\u00e8les pr\u00e9cliniques d&rsquo;infection par le virus de l&rsquo;enc\u00e9phalomyocardite (EMCV) \u00e9taient plus graves. La r\u00e9plication virale et l&rsquo;inflammation cardiaque ont augment\u00e9 de mani\u00e8re significative.<\/p>\n<p>Des travaux ant\u00e9rieurs du laboratoire du Dr Gack ont \u200b\u200bmontr\u00e9 que MDA5 sent de nombreuses autres familles de virus, notamment des coronavirus et des maladies transmises par les moustiques.<\/p>\n<p>\u00ab\u00a0Nous avons d\u00e9montr\u00e9 que MDA5 utilise l&rsquo;isgylation pour ressentir des envahisseurs viraux une fois qu&rsquo;ils sont entr\u00e9s dans notre corps\u00a0\u00bb, explique le Dr Gack. \u00ab\u00a0L&rsquo;isgylation MDA5 est un m\u00e9canisme pivot qui aide notre syst\u00e8me immunitaire \u00e0 r\u00e9pondre \u00e0 un large \u00e9ventail de virus. Comprendre ces processus fondamentaux derri\u00e8re la fa\u00e7on dont le corps d\u00e9tecte un intrus est essentiel \u00e0 la conception de traitements largement antiviraux.\u00a0\u00bb<\/p>\n<p>Drs. Gack et Sarkar disent que leurs r\u00e9sultats pourraient repr\u00e9senter la premi\u00e8re \u00e9tape pour d\u00e9velopper un antiviral \u00e0 large spectre. Les recherches actuelles sur la lutte contre les virus se concentrent principalement sur les vaccins sp\u00e9cifiques au virus ou les traitements antiviraux, explique le Dr Gack. Bien qu&rsquo;il s&rsquo;agisse d&rsquo;excellents outils pour pr\u00e9venir les infections sp\u00e9cifiques, elles sont faites sur mesure pour chaque virus ou m\u00eame une seule souche d&rsquo;un virus.<\/p>\n<p>\u00ab\u00a0\u00c0 l&rsquo;heure actuelle, nous demandons si nous pouvons moduler ces modifications de prot\u00e9ines pour augmenter notre r\u00e9ponse immunitaire inn\u00e9e naturelle pour le d\u00e9veloppement d&rsquo;une approche largement antivirale pour plusieurs infections virales\u00a0\u00bb, explique le Dr Gack. \u00ab\u00a0Ce serait un changement de jeu pour les nouveaux agents pathog\u00e8nes et pour les situations o\u00f9 les approches traditionnelles ont \u00e9chou\u00e9.\u00a0\u00bb<\/p>\n<p>                                        <!-- print only --><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Les chercheurs en virologie de la clinique de Cleveland ont d\u00e9couvert qu&rsquo;une modification sp\u00e9cifique des<\/p>\n","protected":false},"author":1,"featured_media":5701,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[1638,16,1259,3038,1974,2953,669,1204,2306,1197],"class_list":["post-5700","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-maladies","tag-cardiaque","tag-des","tag-immunitaires","tag-limiter","tag-linflammation","tag-modification","tag-peut","tag-proteines","tag-replication","tag-virale","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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