{"id":2555,"date":"2024-12-02T17:59:53","date_gmt":"2024-12-02T16:59:53","guid":{"rendered":"https:\/\/rvh-synergie.org\/actualites\/la-decouverte-dun-nouvel-anticorps-offre-de-lespoir-contre-les-variantes-evolutives-du-sras-cov-2\/"},"modified":"2024-12-02T17:59:55","modified_gmt":"2024-12-02T16:59:55","slug":"la-decouverte-dun-nouvel-anticorps-offre-de-lespoir-contre-les-variantes-evolutives-du-sras-cov-2","status":"publish","type":"post","link":"https:\/\/rvh-synergie.org\/actualites\/la-decouverte-dun-nouvel-anticorps-offre-de-lespoir-contre-les-variantes-evolutives-du-sras-cov-2\/","title":{"rendered":"La d\u00e9couverte d\u2019un nouvel anticorps offre de l\u2019espoir contre les variantes \u00e9volutives du SRAS-CoV-2"},"content":{"rendered":"
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Des chercheurs de l\u2019Universit\u00e9 de Kumamoto ont d\u00e9couvert un anticorps monoclonal capable de neutraliser un large \u00e9ventail de variantes du SRAS-CoV-2, y compris les insaisissables sous-variantes omicron. Cet anticorps, nomm\u00e9 K4-66, a \u00e9t\u00e9 isol\u00e9 d\u2019un cas d\u2019infection \u00e0 perc\u00e9e delta.<\/p>\n

Les r\u00e9sultats, publi\u00e9s dans la revue eBioM\u00e9decine<\/i>mettent en \u00e9vidence la capacit\u00e9 exceptionnelle de K4-66 \u00e0 cibler plusieurs variantes du SRAS-CoV-2, y compris les souches omicrons r\u00e9centes telles que EG.5.1, XBB.1.5 et JN.1.<\/p>\n

L’\u00e9quipe de recherche, dirig\u00e9e par le professeur Shuzo Matsushita du Centre commun de recherche sur les infections \u00e0 r\u00e9trovirus humains (JRCHRI) de l’Universit\u00e9 de Kumamoto, a d\u00e9couvert que K4-66 utilise un g\u00e8ne connu sous le nom d’IGHV3-53\/3-66, qui lui permet de s’adapter au mutations fr\u00e9quentes du virus. Ce g\u00e8ne contribue au d\u00e9veloppement d’\u00ab anticorps publics \u00bb, un type d’anticorps souvent induit chez les individus vaccin\u00e9s ou infect\u00e9s.<\/p>\n

Alors que de nombreux anticorps publics perdent leur efficacit\u00e9 contre les variants fortement mut\u00e9s, le K4-66 pr\u00e9sente une rare capacit\u00e9 \u00e0 les neutraliser, r\u00e9duisant m\u00eame la charge virale dans les poumons des mod\u00e8les de hamsters infect\u00e9s par l’omicron XBB.1.5.<\/p>\n

Les analyses structurelles du K4-66 ont r\u00e9v\u00e9l\u00e9 que son efficacit\u00e9 \u00e0 large spectre r\u00e9side dans sa capacit\u00e9 \u00e0 former des interactions \u00e9lectrostatiques avec le domaine de liaison au r\u00e9cepteur (RBD) de la prot\u00e9ine de pointe, une r\u00e9gion cruciale pour que le virus infecte les cellules humaines.<\/p>\n

Cette d\u00e9couverte est particuli\u00e8rement importante dans la mesure o\u00f9 l\u2019\u00e9volution constante du SRAS-CoV-2 a cr\u00e9\u00e9 des variantes qui \u00e9chappent \u00e0 l\u2019immunit\u00e9 des vaccins et des anticorps th\u00e9rapeutiques actuels. Les sous-variantes d\u2019Omicron, en particulier, se sont r\u00e9v\u00e9l\u00e9es tr\u00e8s r\u00e9sistantes, ce qui complique les efforts mondiaux visant \u00e0 contr\u00f4ler la pand\u00e9mie.<\/p>\n

La capacit\u00e9 du K4-66 \u00e0 neutraliser diverses variantes offre de l’espoir pour le d\u00e9veloppement de nouveaux vaccins et th\u00e9rapies qui restent efficaces malgr\u00e9 l’\u00e9volution rapide du virus.<\/p>\n

Les implications de cette recherche s\u2019\u00e9tendent au-del\u00e0 des applications imm\u00e9diates. L\u2019\u00e9tude sugg\u00e8re que l\u2019am\u00e9lioration de la maturation des anticorps publics comme le K4-66 gr\u00e2ce \u00e0 des strat\u00e9gies vaccinales cibl\u00e9es pourrait conduire \u00e0 des d\u00e9fenses immunitaires plus robustes et plus durables. De tels progr\u00e8s pourraient potentiellement pr\u00e9venir de futures \u00e9pid\u00e9mies et att\u00e9nuer les risques pos\u00e9s par les variants \u00e9mergents.<\/p>\n

Cette perc\u00e9e a \u00e9t\u00e9 r\u00e9alis\u00e9e gr\u00e2ce \u00e0 la collaboration avec des institutions \u00e0 travers le Japon, notamment l’Universit\u00e9 de Tokyo et l’Universit\u00e9 de Kyoto. Le professeur Matsushita a soulign\u00e9 l\u2019importance de cette d\u00e9couverte, notant son potentiel pour guider le d\u00e9veloppement de vaccins de nouvelle g\u00e9n\u00e9ration.<\/p>\n

<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

Des chercheurs de l\u2019Universit\u00e9 de Kumamoto ont d\u00e9couvert un anticorps monoclonal capable de neutraliser un<\/p>\n","protected":false},"author":1,"featured_media":2556,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[2005,90,2305,528,2841,49,1036,1760,1035,1913,2367],"class_list":["post-2555","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-maladies","tag-anticorps","tag-contre","tag-decouverte","tag-dun","tag-evolutives","tag-les","tag-lespoir","tag-nouvel","tag-offre","tag-srascov2","tag-variantes","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50","resize-featured-image"],"yoast_head":"\nLa d\u00e9couverte d\u2019un nouvel anticorps offre de l\u2019espoir contre les variantes \u00e9volutives du SRAS-CoV-2 - 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\/la-decouverte-dun-nouvel-anticorps-offre-de-lespoir-contre-les-variantes-evolutives-du-sras-cov-2\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La d\u00e9couverte d\u2019un nouvel anticorps offre de l\u2019espoir contre les variantes \u00e9volutives du SRAS-CoV-2 - 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