{"id":3471,"date":"2025-01-13T21:57:54","date_gmt":"2025-01-13T20:57:54","guid":{"rendered":"https:\/\/rvh-synergie.org\/actualites\/le-vaccin-covid-19-de-nouvelle-generation-presente-des-resultats-prometteurs-chez-la-souris\/"},"modified":"2025-01-13T21:58:00","modified_gmt":"2025-01-13T20:58:00","slug":"le-vaccin-covid-19-de-nouvelle-generation-presente-des-resultats-prometteurs-chez-la-souris","status":"publish","type":"post","link":"https:\/\/rvh-synergie.org\/actualites\/le-vaccin-covid-19-de-nouvelle-generation-presente-des-resultats-prometteurs-chez-la-souris\/","title":{"rendered":"Le vaccin COVID-19 de nouvelle g\u00e9n\u00e9ration pr\u00e9sente des r\u00e9sultats prometteurs chez la souris"},"content":{"rendered":"<div>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2025\/covid-19-vaccine-devel.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/hires\/2025\/covid-19-vaccine-devel.jpg\" data-sub-html=\"VLPs-based vaccine production and characterization. Credit: &lt;i&gt;Scientific Reports&lt;\/i&gt; (2024). DOI: 10.1038\/s41598-024-76163-w\">\n<figure class=\"article-img\">\n<\/figure><\/div>\n<\/div>\n<p>Des \u00e9tudes men\u00e9es sur des souris ont montr\u00e9 que le vaccin contre la COVID-19 d\u00e9velopp\u00e9 par des chercheurs de la facult\u00e9 de m\u00e9decine de l&rsquo;Universit\u00e9 de S\u00e3o Paulo (FM-USP) au Br\u00e9sil est s\u00fbr et efficace. Le vaccin a d\u00e9clench\u00e9 une r\u00e9ponse immunitaire satisfaisante contre l\u2019agent pathog\u00e8ne chez les souris et les a prot\u00e9g\u00e9es de l\u2019infection. Un article d\u00e9crivant les r\u00e9sultats est publi\u00e9 dans la revue <i>Rapports scientifiques<\/i>.<\/p>\n<p>\u00ab La plupart des vaccins sont bas\u00e9s sur des virus att\u00e9nu\u00e9s ou inactiv\u00e9s, mais notre strat\u00e9gie de nouvelle g\u00e9n\u00e9ration nous permet de donner la priorit\u00e9 non seulement \u00e0 la s\u00e9curit\u00e9 et \u00e0 l&rsquo;efficacit\u00e9, mais \u00e9galement \u00e0 la plasticit\u00e9 de la formulation afin que le vaccin puisse facilement \u00eatre mis \u00e0 jour pour lutter contre les variantes pr\u00e9occupantes \u00bb, a d\u00e9clar\u00e9 Gustavo Cabral. de Miranda, chercheur principal du projet, h\u00e9berg\u00e9 par le laboratoire d&rsquo;immunologie de l&rsquo;Institut de m\u00e9decine tropicale (IMT-FM-USP).<\/p>\n<p>La strat\u00e9gie utilis\u00e9e par les chercheurs du FM-USP pour d\u00e9velopper le vaccin fait appel \u00e0 des particules pseudo-virales (VLP). \u00ab\u00a0Les VLP ont des caract\u00e9ristiques similaires \u00e0 celles des virus, mais sans mat\u00e9riel g\u00e9n\u00e9tique viral. Ainsi, bien qu&rsquo;elles soient reconnues par le syst\u00e8me immunitaire, elles ne peuvent pas se r\u00e9pliquer ni provoquer de maladie\u00a0\u00bb, a d\u00e9clar\u00e9 Cabral.<\/p>\n<p>Les VLP peuvent servir de vaccins \u00e0 elles seules, ou elles peuvent \u00eatre conjugu\u00e9es \u00e0 un antig\u00e8ne (une prot\u00e9ine qui stimule le syst\u00e8me immunitaire \u00e0 produire des anticorps), comme dans ce cas pr\u00e9cis.<\/p>\n<p>\u00ab\u00a0Dans certaines conditions de laboratoire, les prot\u00e9ines structurelles de surface sont capables de se transformer en VLP. Elles peuvent \u00eatre produites en laboratoire \u00e0 l&rsquo;aide de bact\u00e9ries qui agissent comme des usines miniatures pour stimuler cette transformation. Une deuxi\u00e8me \u00e9tape implique l&rsquo;inoculation de l&rsquo;antig\u00e8ne, qui est le \u00ab\u00a0, a-t-il d\u00e9clar\u00e9.<\/p>\n<p>Un autre avantage du vaccin contre la COVID-19, selon Cabral, est qu&rsquo;il ne n\u00e9cessite pas d&rsquo;adjuvant pour renforcer la r\u00e9ponse immunitaire de l&rsquo;organisme \u00e0 l&rsquo;antig\u00e8ne. \u00ab\u00a0Dans les tests in vitro et in vivo, nous avons con\u00e7u des strat\u00e9gies pour maintenir le co\u00fbt de formulation \u00e0 un faible niveau et utiliser la plus petite quantit\u00e9 possible d&rsquo;intrants non d\u00e9velopp\u00e9s dans notre propre laboratoire. Le vaccin ne n\u00e9cessite pas d&rsquo;adjuvant, par exemple\u00a0\u00bb, a-t-il d\u00e9clar\u00e9. dit.<\/p>\n<p>Outre une partie du virus qu\u2019ils sont con\u00e7us pour combattre, ou des mol\u00e9cules qui imitent le virus comme les VLP, les vaccins contiennent divers autres compos\u00e9s qui stimulent la r\u00e9ponse immunitaire, notamment des adjuvants. L\u2019adjuvant le plus courant est l\u2019hydroxyde d\u2019aluminium, utilis\u00e9 dans les vaccins dans le monde entier depuis plus de 100 ans.<\/p>\n<p>\u00ab\u00a0Opter pour le d\u00e9veloppement d&rsquo;un vaccin auto-adjuvant nous permet d&rsquo;\u00e9viter la d\u00e9pendance vis-\u00e0-vis des entreprises qui produisent des adjuvants et de r\u00e9duire le co\u00fbt de la formulation\u00a0\u00bb, a-t-il d\u00e9clar\u00e9.<\/p>\n<p>Le groupe de chercheurs du FM-USP vise \u00e0 produire des connaissances utilisables par une plateforme capable de d\u00e9velopper plusieurs autres vaccins. \u00ab\u00a0Les VLP constituent une technologie tr\u00e8s flexible. Dans ce cas, par exemple, nous pouvons simplement retirer l&rsquo;antig\u00e8ne (un morceau de la prot\u00e9ine Spike du SARS-CoV-2) et le remplacer par une prot\u00e9ine du virus Zika\u00a0\u00bb, a expliqu\u00e9 Cabral.<\/p>\n<p>\u00ab\u00a0Il n&rsquo;y a rien d&rsquo;hypoth\u00e9tique dans cet exemple. Nous d\u00e9veloppons un tel vaccin dans notre laboratoire. Ce n&rsquo;est bien s\u00fbr pas une t\u00e2che simple, mais une plateforme pour le d\u00e9veloppement de plusieurs vaccins peut \u00eatre bas\u00e9e sur cette technologie.\u00a0\u00bb<\/p>\n<p>                                        <!-- print only --><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Des \u00e9tudes men\u00e9es sur des souris ont montr\u00e9 que le vaccin contre la COVID-19 d\u00e9velopp\u00e9<\/p>\n","protected":false},"author":1,"featured_media":3472,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[56,561,16,2268,244,1094,2733,69,1266,323],"class_list":["post-3471","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-maladies","tag-chez","tag-covid19","tag-des","tag-generation","tag-nouvelle","tag-presente","tag-prometteurs","tag-resultats","tag-souris","tag-vaccin","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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