{"id":7164,"date":"2025-06-10T18:55:46","date_gmt":"2025-06-10T16:55:46","guid":{"rendered":"https:\/\/rvh-synergie.org\/actualites\/la-proteine-sars-cov-2-sest-averee-se-propager-entre-les-cellules-declenchant-une-attaque-immunitaire-sur-des-cellules-saines\/"},"modified":"2025-06-10T18:56:05","modified_gmt":"2025-06-10T16:56:05","slug":"la-proteine-sars-cov-2-sest-averee-se-propager-entre-les-cellules-declenchant-une-attaque-immunitaire-sur-des-cellules-saines","status":"publish","type":"post","link":"https:\/\/rvh-synergie.org\/actualites\/la-proteine-sars-cov-2-sest-averee-se-propager-entre-les-cellules-declenchant-une-attaque-immunitaire-sur-des-cellules-saines\/","title":{"rendered":"La prot\u00e9ine SARS-COV-2 s&rsquo;est av\u00e9r\u00e9e se propager entre les cellules, d\u00e9clenchant une attaque immunitaire sur des cellules saines"},"content":{"rendered":"<div>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2025\/sars-cov-2-protein-fou.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/hires\/2025\/sars-cov-2-protein-fou.jpg\" data-sub-html=\"Contribution of different NP parts to binding to heparin and the cell surface. Credit: &lt;i&gt;Cell Reports&lt;\/i&gt; (2025). DOI: 10.1016\/j.celrep.2025.115512\">\n<figure class=\"article-img\">\n<\/figure><\/div>\n<\/div>\n<p>Une nouvelle \u00e9tude r\u00e9v\u00e8le un m\u00e9canisme surprenant par lequel le virus SARS-COV-2, responsable du Covid-19, pourrait provoquer des l\u00e9sions tissulaires \u00e0 m\u00e9diation immunitaire en ciblant les cellules qu&rsquo;il n&rsquo;a jamais infect\u00e9es.<\/p>\n<p>Publi\u00e9 dans <i>Rapports cellulaires<\/i>l&rsquo;\u00e9tude d\u00e9montre que la prot\u00e9ine nucl\u00e9ocapside du virus (NP), mieux connue pour son r\u00f4le dans l&#8217;emballage de l&rsquo;ARN viral \u00e0 l&rsquo;int\u00e9rieur des cellules infect\u00e9es, est transf\u00e9r\u00e9e aux cellules \u00e9pith\u00e9liales non infect\u00e9es voisines et se fixe \u00e0 leurs surfaces.<\/p>\n<p>Une fois pr\u00e9sents sur ces cellules par ailleurs saines, le NP est reconnu par le syst\u00e8me immunitaire et est cibl\u00e9 par des anticorps anti-NP, qui \u00e9tiquettent \u00e0 tort les cellules pour la destruction. Ce processus active la voie du compl\u00e9ment classique, conduisant \u00e0 une inflammation et \u00e0 des dommages cellulaires qui pourraient contribuer \u00e0 des r\u00e9sultats et des complications Covid-19 s\u00e9v\u00e8res tels que longs.<\/p>\n<p>Cette recherche r\u00e9v\u00e8le une mani\u00e8re surprenante dont le virus SARS-COV-2 peut mal orienter le syst\u00e8me immunitaire, provoquant l&rsquo;attaque de cellules saines, simplement parce qu&rsquo;elles ont \u00e9t\u00e9 marqu\u00e9es par une prot\u00e9ine virale. Comprendre ce m\u00e9canisme ouvre la porte \u00e0 de nouvelles strat\u00e9gies pour pr\u00e9venir les dommages \u00e0 l&rsquo;immunit\u00e9 dans le Covid-19 et \u00e9ventuellement d&rsquo;autres infections virales, qui font l&rsquo;objet des \u00e9tudes en cours dans les laboratoires menant cette recherche.<\/p>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2025\/sars-cov-2-protein-fou-1.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/hires\/2025\/sars-cov-2-protein-fou-1.jpg\" data-sub-html=\"Surface-bound NP mediates classical complement activation through anti-NP antibodies (Abs) from COVID-19-recovered individuals. Credit: &lt;i&gt;Cell Reports&lt;\/i&gt; (2025). DOI: 10.1016\/j.celrep.2025.115512\">\n<figure class=\"article-img text-center\">\n            <img decoding=\"async\" src=\"https:\/\/rvh-synergie.org\/actualites\/wp-content\/uploads\/2025\/06\/1749574546_261_La-proteine-SARS-COV-2-sest-averee-se-propager-entre-les-cellules.jpg\" alt=\"La prot\u00e9ine SARS-COV-2 s'est av\u00e9r\u00e9e se propager entre les cellules, d\u00e9clenchant une attaque immunitaire sur des cellules saines\" title=\"Le NP li\u00e9 \u00e0 la surface intervient dans l'activation du compl\u00e9ment classique par le biais d'anticorps anti-NP (ABS) des individus recouverts de Covid-19. Cr\u00e9dit: rapports cellulaires (2025). Doi: 10.1016 \/ j.celrep.2025.115512\"><br \/>\n                     <\/figure>\n<\/p><\/div>\n<\/div>\n<p>Les chercheurs ont utilis\u00e9 des cellules cultiv\u00e9es en laboratoire, des techniques d&rsquo;imagerie sophistiqu\u00e9es et des \u00e9chantillons de patients Covid-19 pour comprendre comment une prot\u00e9ine virale sp\u00e9cifique, appel\u00e9e prot\u00e9ine nucl\u00e9ocapside, s&rsquo;attache aux cellules saines. Ils ont d\u00e9couvert que cette prot\u00e9ine colle \u00e0 certaines mol\u00e9cules de type sucre trouv\u00e9es \u00e0 la surface de nombreuses cellules, appel\u00e9es prot\u00e9oglycanes de sulfate d&rsquo;h\u00e9parane.<\/p>\n<p>Lorsque cela se produit, les touffes de la prot\u00e9ine virale se forment sur ces cellules saines. Le syst\u00e8me immunitaire attaque ensuite \u00e0 tort ces touffes \u00e0 l&rsquo;aide d&rsquo;anticorps, qui d\u00e9clenchent une r\u00e9action en cha\u00eene qui pourrait endommager les cellules, \u00e0 la fois des cellules infect\u00e9es et saines dans l&rsquo;organisme infect\u00e9.<\/p>\n<p>Les chercheurs ont \u00e9galement constat\u00e9 que le m\u00e9dicament \u00e9noxaparine, un diluant sanguin couramment utilis\u00e9, peut emp\u00eacher la prot\u00e9ine virale de coller \u00e0 des cellules saines. Il le fait en prenant en charge les spots auxquels la prot\u00e9ine se lierait normalement, \u00e9tant un analogue d&rsquo;h\u00e9parine. Dans les deux exp\u00e9riences en laboratoire et lorsque les \u00e9chantillons obtenus aupr\u00e8s de patients ont \u00e9t\u00e9 test\u00e9s en laboratoire, l&rsquo;\u00e9noxaparine a emp\u00each\u00e9 la prot\u00e9ine de se fixer aux cellules et a aid\u00e9 \u00e0 emp\u00eacher le syst\u00e8me immunitaire de les attaquer \u00e0 tort.<\/p>\n<p>L&rsquo;\u00e9tude a impliqu\u00e9 les efforts de collaboration des laboratoires du Dr Alexander Rouvinski, du professeur Ora Schueler-Furman et du professeur Reuven Wiener, dirig\u00e9 par Ph.D. \u00c9tudiants Jamal Fahoum et Maria Billan de la Facult\u00e9 de m\u00e9decine de l&rsquo;Universit\u00e9 h\u00e9bra\u00efque de J\u00e9rusalem. Les cliniciens Dr Dan Padawer, le professeur Dana Wolf et le Dr Orly Zelig et les membres de leur \u00e9quipe de plusieurs d\u00e9partements de l&rsquo;Universit\u00e9 Hebrew &#8211; Hadassah Medical Center ont fourni les donn\u00e9es cliniques compl\u00e9mentaires n\u00e9cessaires \u00e0 ce travail. Les auteurs consacrent l&rsquo;article \u00e0 la m\u00e9moire de feu le professeur Herv\u00e9 (Hillel) Bercovie, un microbiologiste dou\u00e9, un scientifique inspirant et un grand mentor<\/p>\n<p>Les exp\u00e9riences d&rsquo;infection SARS-COV-2 essentielles pour cette recherche ont \u00e9t\u00e9 r\u00e9alis\u00e9es dans le laboratoire national de biocontainment \u00e9lev\u00e9 r\u00e9cemment \u00e9tabli, Barry Skolnick Biosafety Level 3 (BSL3) Unit\u00e9 nationale du centre de recherche de base \u00e0 la Facult\u00e9 de m\u00e9decine de l&rsquo;Universit\u00e9 h\u00e9bra\u00efque de J\u00e9rusalem.<\/p>\n<p>                                        <!-- print only --><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Une nouvelle \u00e9tude r\u00e9v\u00e8le un m\u00e9canisme surprenant par lequel le virus SARS-COV-2, responsable du Covid-19,<\/p>\n","protected":false},"author":1,"featured_media":7165,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[5627,3464,1622,5626,16,159,834,49,1888,1033,120,1160,535,112,47],"class_list":["post-7164","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-maladies","tag-attaque","tag-averee","tag-cellules","tag-declenchant","tag-des","tag-entre","tag-immunitaire","tag-les","tag-propager","tag-proteine","tag-saines","tag-sarscov2","tag-sest","tag-sur","tag-une","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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