{"id":8394,"date":"2026-10-22T16:37:40","date_gmt":"2026-10-22T13:37:40","guid":{"rendered":"https:\/\/wiki.voka.io\/glossary\/imunoglobulina-m\/"},"modified":"2026-10-22T16:37:42","modified_gmt":"2026-10-22T13:37:42","slug":"imunoglobulina-m","status":"publish","type":"glossary_item","link":"https:\/\/wiki.voka.io\/pt\/glossario\/imunoglobulina-m\/","title":{"rendered":"Imunoglobulina M"},"content":{"rendered":"\n

A imunoglobulina M, ou IgM (do latim immunitas<\/em> \u2014 libera\u00e7\u00e3o, isen\u00e7\u00e3o de algo e globulus<\/em> \u2014 esfera, gota; M \u2014 nome do tipo de cadeia proteica), \u00e9 a primeira classe de anticorpos que o sistema imunol\u00f3gico come\u00e7a a produzir no primeiro contato com um ant\u00edgeno.<\/p>\n\n

Essas s\u00e3o as \u00abfor\u00e7as de resposta r\u00e1pida\u00bb, destinadas \u00e0 prote\u00e7\u00e3o emergencial do organismo at\u00e9 que sejam sintetizados anticorpos de mem\u00f3ria mais aperfei\u00e7oados (IgG).<\/p>\n\n

Etiologia e fisiopatologia<\/h2>\n\n

A s\u00edntese de IgM come\u00e7a entre o 3.\u00ba e o 5.\u00ba dia ap\u00f3s o in\u00edcio da doen\u00e7a. Fisicamente, essa \u00e9 a maior mol\u00e9cula do sistema imunol\u00f3gico.<\/p>\n\n

Ela consiste em um pent\u00e2mero \u2014 cinco anticorpos cl\u00e1ssicos em forma de Y unidos em um anel. Gra\u00e7as a essa estrutura, a mol\u00e9cula de IgM apresenta 10 s\u00edtios de liga\u00e7\u00e3o ao ant\u00edgeno.<\/p>\n\n

As mol\u00e9culas de IgM apresentam diversas propriedades espec\u00edficas:<\/p>\n\n

    \n
  • capacidade de aglutina\u00e7\u00e3o<\/strong> \u2014 embora a avidez (for\u00e7a) de cada contato individual da IgM seja menor que a da IgG, seu enorme tamanho permite unir (aglutinar) instantaneamente dezenas de bact\u00e9rias ou v\u00edrions entre si, privando-os de mobilidade e ativando a cascata de prote\u00ednas do sistema complemento para sua destrui\u00e7\u00e3o;<\/li>\n\n\n\n
  • incapacidade de atravessar a placenta<\/strong> \u2014 devido ao seu grande tamanho, a IgM n\u00e3o consegue atravessar fisicamente a placenta da m\u00e3e para o feto.<\/li>\n<\/ul>\n\n

    Import\u00e2ncia cl\u00ednica<\/h2>\n\n

    Na pr\u00e1tica m\u00e9dica, a imunoglobulina M apresenta os seguintes aspectos de aplica\u00e7\u00e3o:<\/p>\n\n

      \n
    • no diagn\u00f3stico laboratorial<\/strong> \u2014 a detec\u00e7\u00e3o da imunoglobulina M \u00e9 um marcador de infec\u00e7\u00e3o aguda, em curso ou recente. \u00c0 medida que ocorre a recupera\u00e7\u00e3o, o n\u00edvel de IgM no sangue diminui rapidamente e desaparece por completo ap\u00f3s alguns meses;<\/li>\n\n\n\n
    • em neonatologia<\/strong> \u2014 apresenta import\u00e2ncia excepcional. Se forem detectadas no sangue de um rec\u00e9m-nascido IgM contra Toxoplasma ou rub\u00e9ola, isso confirma a infec\u00e7\u00e3o intrauterina na presen\u00e7a dos sinais cl\u00ednicos correspondentes de infec\u00e7\u00e3o cong\u00eanita. Como as IgM maternas n\u00e3o atravessam a placenta, sua presen\u00e7a no sangue do lactente significa que o feto foi infectado e que seu sistema imunol\u00f3gico as produziu de forma independente.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

      A imunoglobulina M, ou IgM (do latim immunitas<\/em> \u2014 libera\u00e7\u00e3o, isen\u00e7\u00e3o de algo e globulus<\/em> \u2014 esfera, gota; M \u2014 nome do tipo de cadeia proteica), \u00e9 a primeira classe de anticorpos que o sistema imunol\u00f3gico come\u00e7a a produzir no primeiro contato com um ant\u00edgeno. <\/p>\n","protected":false},"featured_media":0,"template":"","class_list":["post-8394","glossary_item","type-glossary_item","status-publish","hentry"],"acf":[],"yoast_head":"\nImunoglobulina M: defini\u00e7\u00e3o m\u00e9dica e vis\u00e3o geral | Voka Wiki<\/title>\n<meta name=\"description\" content=\"A imunoglobulina M, ou IgM (do latim immunitas \u2014 libera\u00e7\u00e3o, isen\u00e7\u00e3o de algo e globulus \u2014 esfera, gota; M \u2014 nome do tipo de cadeia proteica), \u00e9 a primeira classe de anticorpos que o sistema imunol\u00f3gico come\u00e7a a produzir no primeiro contato com um ant\u00edgeno.\" \/>\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\/pt\/glossario\/imunoglobulina-m\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Imunoglobulina M\" \/>\n<meta property=\"og:description\" content=\"A imunoglobulina M, ou IgM (do latim immunitas \u2014 libera\u00e7\u00e3o, isen\u00e7\u00e3o de algo e globulus \u2014 esfera, gota; 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