{"id":3358,"date":"2026-02-26T16:55:26","date_gmt":"2026-02-26T13:55:26","guid":{"rendered":"https:\/\/wiki.voka.io\/glossary\/laktobakterii\/"},"modified":"2026-02-26T16:55:19","modified_gmt":"2026-02-26T13:55:19","slug":"lactobacilos","status":"publish","type":"glossary_item","link":"https:\/\/wiki.voka.io\/pt\/glossario\/lactobacilos\/","title":{"rendered":"Lactobacillus"},"content":{"rendered":"\n<p><em>Lactobacillus spp. <\/em>\u00e9 um g\u00e9nero de bact\u00e9rias Gram-positivas, n\u00e3o formadoras de esporos, facultativamente anaer\u00f3bias ou microaer\u00f3filas. S\u00e3o as bact\u00e9rias dominantes obrigat\u00f3rias (95-98% da massa bacteriana total) do microbiota vaginal de uma mulher saud\u00e1vel em idade reprodutiva. <\/p>\n\n<h2 class=\"wp-block-heading\" 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;\"><strong>Etiologia e fisiopatologia<\/strong><\/h2>\n\n<p>As esp\u00e9cies mais comuns no bi\u00f3topo vaginal s\u00e3o <em>L. crispatus<\/em>, <em>L. jensenii<\/em>, <em>L. gasseri<\/em> e <em>L. iners<\/em>. O seu papel fisiol\u00f3gico consiste em proporcionar resist\u00eancia \u00e0 coloniza\u00e7\u00e3o atrav\u00e9s de tr\u00eas mecanismos: <\/p>\n\n<ol class=\"wp-block-list\">\n<li><strong>Acidog\u00e9nese:<\/strong> Os lactobacilos fermentam o glicog\u00e9nio contido nas c\u00e9lulas maduras do epit\u00e9lio vaginal para formar \u00e1cido l\u00e1tico. Isto mant\u00e9m o pH do ambiente entre 3,8-4,5, criando condi\u00e7\u00f5es desfavor\u00e1veis para o crescimento de microrganismos patog\u00e9nicos e oportunistas. <\/li>\n\n\n\n<li><strong>S\u00edntese de per\u00f3xido de hidrog\u00e9nio (H\u2082O\u2082):<\/strong> Muitas estirpes produzem H\u2082O\u2082, que na presen\u00e7a de mieloperoxidase tem um potente efeito bactericida em anaer\u00f3bios catalase-negativos (por exemplo, <em>Gardnerella vaginalis<\/em>).<\/li>\n\n\n\n<li><strong>Ades\u00e3o competitiva:<\/strong> As bact\u00e9rias revestem densamente os receptores na superf\u00edcie dos epiteli\u00f3citos, formando um biofilme protetor e impedindo fisicamente a ades\u00e3o dos agentes patog\u00e9nicos.<\/li>\n<\/ol>\n\n<h2 class=\"wp-block-heading\" id=\"h-&#x43A;&#x43B;&#x438;&#x43D;&#x438;&#x447;&#x435;&#x441;&#x43A;&#x43E;&#x435;-&#x437;&#x43D;&#x430;&#x447;&#x435;&#x43D;&#x438;&#x435;\"><strong>Significado cl\u00ednico<\/strong><\/h2>\n\n<p>A diminui\u00e7\u00e3o do t\u00edtulo de lactobacilos (<strong>menos de 10\u2076 CFU\/ml<\/strong>) ou a substitui\u00e7\u00e3o de estirpes produtoras de H\u2082O\u2082 por estirpes inactivas \u00e9 um elo fundamental na patog\u00e9nese da <strong>vaginose bacteriana<\/strong>, da vaginite aer\u00f3bica e da candid\u00edase. Na <strong>vaginite atr\u00f3fica<\/strong> p\u00f3s-menop\u00e1usica, a defici\u00eancia de estrog\u00e9nio leva \u00e0 interrup\u00e7\u00e3o da matura\u00e7\u00e3o epitelial e ao desaparecimento do glicog\u00e9nio. Isto priva os lactobacilos de substrato nutritivo, conduz \u00e0 sua elimina\u00e7\u00e3o, \u00e0 alcaliniza\u00e7\u00e3o do ambiente e ao desenvolvimento de disbiose.  <\/p>\n","protected":false},"excerpt":{"rendered":"<p><em>Lactobacillus spp. <\/em>\u00e9 um g\u00e9nero de bact\u00e9rias Gram-positivas, n\u00e3o formadoras de esporos, facultativamente anaer\u00f3bias ou microaer\u00f3filas. S\u00e3o as bact\u00e9rias dominantes obrigat\u00f3rias (95-98% da massa bacteriana total) do microbiota vaginal de uma mulher saud\u00e1vel em idade reprodutiva. <\/p>\n","protected":false},"featured_media":0,"template":"","class_list":["post-3358","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 v26.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Lactobacillus: defini\u00e7\u00e3o m\u00e9dica e vis\u00e3o geral | Voka Wiki<\/title>\n<meta name=\"description\" content=\"Lactobacillus spp. \u00e9 um g\u00e9nero de bact\u00e9rias Gram-positivas, n\u00e3o formadoras de esporos, facultativamente anaer\u00f3bias ou microaer\u00f3filas. 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