{"id":7342,"date":"2026-06-11T10:14:04","date_gmt":"2026-06-11T07:14:04","guid":{"rendered":"https:\/\/wiki.voka.io\/glossary\/antigene\/"},"modified":"2026-07-23T14:04:31","modified_gmt":"2026-07-23T11:04:31","slug":"antigene","status":"publish","type":"glossary_item","link":"https:\/\/wiki.voka.io\/fr\/glossaire\/antigene\/","title":{"rendered":"Antig\u00e8ne"},"content":{"rendered":"\n

Antig\u00e8ne (du grec anti<\/em> \u2014 contre et gennao<\/em> \u2014 produire) \u2014 d\u00e9signe toute substance \u00e9trang\u00e8re \u00e0 l’organisme, reconnue par les r\u00e9cepteurs des cellules immunitaires et d\u00e9clenchant une cascade de r\u00e9actions immunitaires protectrices (induit une r\u00e9ponse immunitaire). <\/p>\n\n

Normalement, un syst\u00e8me immunitaire sain per\u00e7oit les antig\u00e8nes comme des marqueurs de menace biologique et initie leur destruction.<\/p>\n\n

\u00c9tiologie et physiopathologie<\/strong><\/h2>\n\n

Dans leur structure chimique, les antig\u00e8nes sont souvent des prot\u00e9ines complexes de haut poids mol\u00e9culaire, des glycoprot\u00e9ines ou des polysaccharides. Le syst\u00e8me immunitaire ne reconna\u00eet pas la mol\u00e9cule enti\u00e8re. Il r\u00e9agit uniquement aux petites r\u00e9gions uniques sur sa surface, appel\u00e9es \u00e9pitopes.<\/p>\n\n

Le processus de pr\u00e9sentation de l’antig\u00e8ne et le d\u00e9clenchement de la r\u00e9ponse immunitaire comprend les \u00e9tapes suivantes :<\/p>\n\n

    \n
  1. l’absorption de l’agent pathog\u00e8ne<\/strong> \u2014 lorsque la bact\u00e9rie ou le virus p\u00e9n\u00e8tre dans le tissu, des cellules patrouille sp\u00e9cifiques (macrophages et cellules dendritiques) l’absorbent ;<\/li>\n\n\n\n
  2. clivage et pr\u00e9sentation<\/strong> \u2014 les cellules d\u00e9composent physiquement l’agent pathog\u00e8ne en fragments et affichent ces \u00e9pitopes antig\u00e9niques sur leur propre membrane cellulaire \u00e0 l’aide du complexe majeur d’histocompatibilit\u00e9 (MHC) ;<\/li>\n\n\n\n
  3. activation des lymphocytes T<\/strong> \u2014 seulement ensuite les cellules T peuvent \u00ab voir \u00bb l’ennemi, s’activer et donner l’ordre pour la production massive d’une arme sp\u00e9cifique \u2014 des anticorps.<\/li>\n<\/ol>\n\n

    Importance clinique<\/strong><\/h2>\n\n

    Le concept d’antig\u00e8ne est \u00e0 la base de toute la diagnostic de laboratoire, la transfusiologie et la prophylaxie vaccinale :<\/p>\n\n

      \n
    • prophylaxie vaccinale<\/strong> \u2014 les vaccins contiennent des antig\u00e8nes hautement purifi\u00e9s ou synth\u00e9tis\u00e9s artificiellement, qui entra\u00eenent en toute s\u00e9curit\u00e9 l’immunit\u00e9 \u00e0 reconna\u00eetre l’infection ;<\/li>\n\n\n\n
    • diagnostic de laboratoire<\/strong> \u2014 les tests rapides (pour COVID-19, grippe, streptocoque) visent \u00e0 rechercher physiquement des antig\u00e8nes sp\u00e9cifiques de l’agent pathog\u00e8ne dans le biomat\u00e9riau du patient ;<\/li>\n\n\n\n
    • transfusiologie<\/strong> \u2014 les groupes sanguins humains (syst\u00e8me ABO et facteur Rh) sont d\u00e9termin\u00e9s par la pr\u00e9sence d’antig\u00e8nes sp\u00e9cifiques sur la membrane des \u00e9rythrocytes.<\/li>\n<\/ul>\n\n

      Une transfusion sanguine incorrecte avec un antig\u00e8ne \u00e9tranger provoque une crise h\u00e9molytique potentiellement mortelle.<\/p>\n","protected":false},"excerpt":{"rendered":"

      Antig\u00e8ne (du grec anti<\/em> \u2014 contre et gennao<\/em> \u2014 produire) \u2014 d\u00e9signe toute substance \u00e9trang\u00e8re \u00e0 l’organisme, reconnue par les r\u00e9cepteurs des cellules immunitaires et d\u00e9clenchant une cascade de r\u00e9actions immunitaires protectrices (induit une r\u00e9ponse immunitaire). <\/p>\n","protected":false},"featured_media":0,"template":"","class_list":["post-7342","glossary_item","type-glossary_item","status-publish","hentry"],"acf":[],"yoast_head":"\nAntig\u00e8ne : d\u00e9finition m\u00e9dicale et description | Voka Wiki<\/title>\n<meta name=\"description\" content=\"Antig\u00e8ne (du grec anti \u2014 contre et gennao \u2014 produire) \u2014 d\u00e9signe toute substance \u00e9trang\u00e8re \u00e0 l'organisme, reconnue par les r\u00e9cepteurs des cellules immunitaires et d\u00e9clenchant une cascade de r\u00e9actions immunitaires protectrices (induit une r\u00e9ponse immunitaire).\" \/>\n<meta name=\"robots\" content=\"index, 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