{"id":8397,"date":"2026-10-22T16:37:40","date_gmt":"2026-10-22T13:37:40","guid":{"rendered":"https:\/\/wiki.voka.io\/glossary\/immunoglobuline-m\/"},"modified":"2026-10-22T16:37:45","modified_gmt":"2026-10-22T13:37:45","slug":"immunoglobuline-m","status":"publish","type":"glossary_item","link":"https:\/\/wiki.voka.io\/fr\/glossaire\/immunoglobuline-m\/","title":{"rendered":"Immunoglobuline M"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">L\u2019immunoglobuline M, ou IgM (du latin <em>immunitas<\/em> \u2014 lib\u00e9ration, d\u00e9livrance de quelque chose et <em>globulus<\/em> \u2014 petite sph\u00e8re, goutte ; M \u2014 d\u00e9signation du type de cha\u00eene prot\u00e9ique), est la premi\u00e8re classe d\u2019anticorps que le syst\u00e8me immunitaire commence \u00e0 produire lors du premier contact avec un antig\u00e8ne.<\/p>\n\n<p class=\"wp-block-paragraph\">Il s\u2019agit de \u00ab forces d\u2019intervention rapide \u00bb, destin\u00e9es \u00e0 assurer une protection d\u2019urgence de l\u2019organisme jusqu\u2019\u00e0 la synth\u00e8se d\u2019anticorps m\u00e9moire plus performants (IgG).<\/p>\n\n<h2 id=\"h-&#x44D;&#x442;&#x438;&#x43E;&#x43B;&#x43E;&#x433;&#x438;&#x44F;-&#x438;-&#x43F;&#x430;&#x442;&#x43E;&#x444;&#x438;&#x437;&#x438;&#x43E;&#x43B;&#x43E;&#x433;&#x438;&#x44F;\" class=\"wp-block-heading\">\u00c9tiologie et physiopathologie<\/h2>\n\n<p class=\"wp-block-paragraph\">La synth\u00e8se des IgM commence entre le 3e et le 5e jour apr\u00e8s le d\u00e9but de la maladie. Sur le plan physique, il s\u2019agit de la plus grande mol\u00e9cule du syst\u00e8me immunitaire.<\/p>\n\n<p class=\"wp-block-paragraph\">Elle se pr\u00e9sente sous la forme d\u2019un pentam\u00e8re, constitu\u00e9 de cinq anticorps classiques en forme de Y reli\u00e9s en anneau. Gr\u00e2ce \u00e0 cette structure, la mol\u00e9cule d\u2019IgM poss\u00e8de 10 sites de liaison \u00e0 l\u2019antig\u00e8ne.<\/p>\n\n<p class=\"wp-block-paragraph\">Les mol\u00e9cules d\u2019IgM poss\u00e8dent plusieurs propri\u00e9t\u00e9s sp\u00e9cifiques :<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>capacit\u00e9 d\u2019agglutination<\/strong> \u2014 bien que l\u2019avidit\u00e9 (force) de chaque contact individuel des IgM soit inf\u00e9rieure \u00e0 celle des IgG, leur taille consid\u00e9rable leur permet de coller (agglutiner) instantan\u00e9ment entre eux des dizaines de bact\u00e9ries ou de virions, les privant de mobilit\u00e9 et activant la cascade de prot\u00e9ines du syst\u00e8me du compl\u00e9ment afin de les d\u00e9truire ;<\/li>\n\n\n\n<li><strong>incapacit\u00e9 \u00e0 traverser le placenta<\/strong> \u2014 en raison de leur grande taille, les IgM ne peuvent physiquement pas traverser le placenta de la m\u00e8re vers le f\u0153tus.<\/li>\n<\/ul>\n\n<h2 id=\"h-&#x43A;&#x43B;&#x438;&#x43D;&#x438;&#x447;&#x435;&#x441;&#x43A;&#x43E;&#x435;-&#x437;&#x43D;&#x430;&#x447;&#x435;&#x43D;&#x438;&#x435;\" class=\"wp-block-heading\">Importance clinique<\/h2>\n\n<p class=\"wp-block-paragraph\">Dans la pratique m\u00e9dicale, l\u2019immunoglobuline M pr\u00e9sente les applications suivantes :<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>en diagnostic biologique<\/strong> \u2014 la d\u00e9tection de l\u2019immunoglobuline M constitue un marqueur d\u2019infection aigu\u00eb, en cours ou r\u00e9cente. Au cours de la gu\u00e9rison, le taux sanguin d\u2019IgM diminue rapidement et devient ind\u00e9tectable apr\u00e8s quelques mois ;<\/li>\n\n\n\n<li><strong>en n\u00e9onatologie<\/strong> \u2014 elle rev\u00eat une importance exceptionnelle. La d\u00e9tection, dans le sang d\u2019un nouveau-n\u00e9, d\u2019IgM dirig\u00e9es contre Toxoplasma ou le virus de la rub\u00e9ole confirme une infection intra-ut\u00e9rine en pr\u00e9sence de signes cliniques correspondants d\u2019infection cong\u00e9nitale. Puisque les IgM maternelles ne traversent pas le placenta, leur pr\u00e9sence dans le sang du nourrisson signifie que le f\u0153tus a \u00e9t\u00e9 infect\u00e9 et que son syst\u00e8me immunitaire les a produites lui-m\u00eame.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>L\u2019immunoglobuline M, ou IgM (du latin <em>immunitas<\/em> \u2014 lib\u00e9ration, d\u00e9livrance de quelque chose et <em>globulus<\/em> \u2014 petite sph\u00e8re, goutte ; M \u2014 d\u00e9signation du type de cha\u00eene prot\u00e9ique), est la premi\u00e8re classe d\u2019anticorps que le syst\u00e8me immunitaire commence \u00e0 produire lors du premier contact avec un antig\u00e8ne. <\/p>\n","protected":false},"featured_media":0,"template":"","class_list":["post-8397","glossary_item","type-glossary_item","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v27.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Immunoglobuline M : d\u00e9finition m\u00e9dicale et description | Voka Wiki<\/title>\n<meta name=\"description\" content=\"L\u2019immunoglobuline M, ou IgM (du latin immunitas \u2014 lib\u00e9ration, d\u00e9livrance de quelque chose et globulus \u2014 petite sph\u00e8re, goutte ; M \u2014 d\u00e9signation du type de cha\u00eene prot\u00e9ique), est la premi\u00e8re classe d\u2019anticorps que le syst\u00e8me immunitaire commence \u00e0 produire lors du premier contact avec un antig\u00e8ne.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/wiki.voka.io\/fr\/glossaire\/immunoglobuline-m\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Immunoglobuline M\" \/>\n<meta property=\"og:description\" content=\"L\u2019immunoglobuline M, ou IgM (du latin immunitas \u2014 lib\u00e9ration, d\u00e9livrance de quelque chose et globulus \u2014 petite sph\u00e8re, goutte ; M \u2014 d\u00e9signation du type de cha\u00eene prot\u00e9ique), est la premi\u00e8re classe d\u2019anticorps que le syst\u00e8me immunitaire commence \u00e0 produire lors du premier contact avec un antig\u00e8ne.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/wiki.voka.io\/fr\/glossaire\/immunoglobuline-m\/\" \/>\n<meta property=\"og:site_name\" content=\"Voka Wiki\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/VOKA3DAnatomyAndPathology\/\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-22T13:37:45+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/wiki.voka.io\\\/fr\\\/glossaire\\\/immunoglobuline-m\\\/\",\"url\":\"https:\\\/\\\/wiki.voka.io\\\/fr\\\/glossaire\\\/immunoglobuline-m\\\/\",\"name\":\"Immunoglobuline M : d\u00e9finition m\u00e9dicale et description | Voka Wiki\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/wiki.voka.io\\\/fr\\\/#website\"},\"datePublished\":\"2026-10-22T13:37:40+00:00\",\"dateModified\":\"2026-10-22T13:37:45+00:00\",\"description\":\"L\u2019immunoglobuline M, ou IgM (du latin immunitas \u2014 lib\u00e9ration, d\u00e9livrance de quelque chose et globulus \u2014 petite sph\u00e8re, goutte ; 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