{"id":7405,"date":"2026-07-23T14:02:46","date_gmt":"2026-07-23T11:02:46","guid":{"rendered":"https:\/\/wiki.voka.io\/glossary\/barriere-placentaire\/"},"modified":"2026-07-23T14:02:49","modified_gmt":"2026-07-23T11:02:49","slug":"barriere-placentaire","status":"publish","type":"glossary_item","link":"https:\/\/wiki.voka.io\/fr\/glossaire\/barriere-placentaire\/","title":{"rendered":"Barri\u00e8re placentaire"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">La barri\u00e8re placentaire (du grec <em>plakus<\/em> \u2014 galette) est une barri\u00e8re entre le sang de la m\u00e8re et celui du f\u0153tus dans le placenta, poss\u00e9dant une perm\u00e9abilit\u00e9 s\u00e9lective dans les deux directions.<\/p>\n\n<p class=\"wp-block-paragraph\">Elle agit comme un filtre qui fournit la nutrition et la respiration \u00e0 l&rsquo;organisme en d\u00e9veloppement, tout en le prot\u00e9geant des effets de la plupart des microorganismes.<\/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\"><strong>\u00c9tiologie et physiopathologie<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">La base morphologique de la barri\u00e8re est constitu\u00e9e par les tissus des villosit\u00e9s choriales du f\u0153tus, qui sont en contact avec le sang maternel. <\/p>\n\n<p class=\"wp-block-paragraph\">La perm\u00e9abilit\u00e9 de la barri\u00e8re change au cours de la grossesse, augmentant consid\u00e9rablement au troisi\u00e8me trimestre.<\/p>\n\n<p class=\"wp-block-paragraph\">La barri\u00e8re poss\u00e8de une s\u00e9lectivit\u00e9 immunologique unique. Par exemple, elle laisse passer activement les anticorps maternels de classe IgG, fournissant au nouveau-n\u00e9 une immunit\u00e9 passive. Cependant, les anticorps plus gros de classe IgM ne la traversent pas. <\/p>\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\"><strong>Importance clinique<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">L&rsquo;\u00e9tat de la barri\u00e8re placentaire d\u00e9termine le risque d&rsquo;infection intra-ut\u00e9rine. En pratique m\u00e9dicale, cela rev\u00eat une importance cruciale dans plusieurs aspects :<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>surveillance des infections TORCH<\/strong> \u2014 les agents pathog\u00e8nes de ces maladies peuvent traverser la protection du placenta et causer de graves malformations ;<\/li>\n\n\n\n<li><strong>\u00e9valuation de la s\u00e9curit\u00e9 des m\u00e9dicaments<\/strong> \u2014 lors de la prescription de m\u00e9dicaments aux femmes enceintes, le facteur cl\u00e9 est la capacit\u00e9 de la mol\u00e9cule \u00e0 traverser la barri\u00e8re placentaire ;<\/li>\n\n\n\n<li><strong>cr\u00e9ation d&rsquo;un \u00ab bouclier m\u00e9dicamenteux \u00bb<\/strong> \u2014 la th\u00e9rapie de certaines infections chez les femmes enceintes vise \u00e0 maintenir la concentration du m\u00e9dicament emp\u00eachant le passage du microbe au f\u0153tus.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>La barri\u00e8re placentaire (du grec <em>plakus<\/em> \u2014 galette) est une barri\u00e8re entre le sang de la m\u00e8re et celui du f\u0153tus dans le placenta, poss\u00e9dant une perm\u00e9abilit\u00e9 s\u00e9lective dans les deux directions.<\/p>\n","protected":false},"featured_media":0,"template":"","class_list":["post-7405","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>Barri\u00e8re placentaire : d\u00e9finition m\u00e9dicale et description | Voka Wiki<\/title>\n<meta name=\"description\" content=\"La barri\u00e8re placentaire (du grec plakus \u2014 galette) est une barri\u00e8re entre le sang de la m\u00e8re et celui du f\u0153tus dans le placenta, poss\u00e9dant une perm\u00e9abilit\u00e9 s\u00e9lective dans les deux directions.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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