{"id":5016,"date":"2026-02-18T13:33:47","date_gmt":"2026-02-18T12:33:47","guid":{"rendered":"https:\/\/esclerosismultiplegalicia.org\/?p=5016"},"modified":"2026-02-18T13:34:32","modified_gmt":"2026-02-18T12:34:32","slug":"o-papel-da-microbiota-intestinal-o-eixo-intestino-cerebro","status":"publish","type":"post","link":"http:\/\/esclerosismultiplegalicia.org\/index.php\/2026\/02\/18\/o-papel-da-microbiota-intestinal-o-eixo-intestino-cerebro\/","title":{"rendered":"O papel da microbiota intestinal: o eixo intestino-cerebro"},"content":{"rendered":"\n<p>Nos \u00faltimos anos, <strong>a microbiota intestinal converteuse nun dos campos de investigaci\u00f3n m\u00e1is relevantes no \u00e1mbito da sa\u00fade<\/strong>. Especialmente, o estudo do chamado <strong>eixo intestino-cerebro<\/strong> abriu unha nova perspectiva para comprender como o equilibro da nosa microbiota pode influ\u00edr no sistema nervioso e inmunitario.<\/p>\n\n\n\n<p>O que durante moito tempo se considerou un simple conxunto de microorganismos presentes no noso corpo, hoxe ent\u00e9ndese como un <strong>ecosistema complexo e din\u00e1mico<\/strong> que infl\u00fae no funcionamento metab\u00f3lico, inmunol\u00f3xico e mesmo neurol\u00f3xico.<\/p>\n\n\n\n<p>A evidencia cient\u00edfica actual parece indicar que o equilibro da microbiota intestinal pode influ\u00edr no desenvolvemento e evoluci\u00f3n de m\u00faltiples enfermidades: patolox\u00edas inflamatorias, trastornos metab\u00f3licos e tam\u00e9n determinadas enfermidades neurol\u00f3xicas como a<strong> <a href=\"https:\/\/esclerosismultiplegalicia.org\/index.php\/que-e-a-em\/\">Esclerose M\u00faltiple (EM)<\/a><\/strong>.<\/p>\n\n\n\n<p>Comprender que \u00e9 a microbiota, como funciona e que ocorre cando se altera resulta fundamental para lograr maiores co\u00f1ecementos sobre posibles tratamentos e terapias para a EM.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Que \u00e9 a microbiota?<\/h3>\n\n\n\n<p>A microbiota fai referencia ao <strong>conxunto de microorganismos que colonizan o noso organismo<\/strong>. A s\u00faa principal localizaci\u00f3n \u00e9 o tracto grastrointestinal (1), a\u00ednda que tam\u00e9n est\u00e1 presente na cavidade oral, no sistema respiratorio ou na superficie cut\u00e1nea (2). <\/p>\n\n\n\n<p>Est\u00e1 formada principalmente por <strong>bacterias, pero tam\u00e9n incl\u00fae virus, fungos e arqueas<\/strong>. En conxunto, constit\u00fae un verdadeiro <strong>ecosistema <\/strong>complexo e din\u00e1mico, en constante transformaci\u00f3n (1). <\/p>\n\n\n\n<p>A microbiota f\u00f3rmase nas primeiras etapas da vida e evoluciona de maneira continuada baixo a influencia de m\u00faltiples factores (2):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Factores <strong>xen\u00e9ticos<\/strong>.<\/li>\n\n\n\n<li>Fatores <strong>ambientais<\/strong>.<\/li>\n\n\n\n<li>Factores <strong>nutricionais<\/strong> (alimentaci\u00f3n).<\/li>\n\n\n\n<li>Factores <strong>farmacol\u00f3xicos<\/strong> (uso de medicamentos).<\/li>\n\n\n\n<li>Factores <strong>socioculturais<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p>Ademais, cada parte do corpo cont\u00e9n unha <strong>poboaci\u00f3n diferente <\/strong>na microbiota. Incluso dentro do popio tracto intestinal, a composici\u00f3n var\u00eda segundo a zona e a idade (2). <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">As funci\u00f3ns da microbiota intestinal<\/h3>\n\n\n\n<p>A microbiota intestinal mant\u00e9n unha relaci\u00f3n simbi\u00f3tica coa <strong>mucosa intestinal<\/strong>, \u00e9 dicir, ambos benef\u00edcianse mutuamente. Cumpre tres grandes funci\u00f3ns: metab\u00f3lica, inmunol\u00f3xica e de protecci\u00f3n intestinal.<\/p>\n\n\n\n<p>Por todo isto, a microbiota intestinal consid\u00e9rase un verdadeiro &#8220;\u00f3rgano metab\u00f3lico e inmunol\u00f3xico&#8221; (1). Este aspecto resulta especialmente relevante no contexto da EM, unha enfermidade na que o sistema inmunitario xoga un papel central.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Funci\u00f3n metab\u00f3lica<\/h4>\n\n\n\n<p>Participa na dixesti\u00f3n, na produci\u00f3n de determinados metabolitos e na obtenci\u00f3n de enerx\u00eda.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Funci\u00f3n inmunol\u00f3xica<\/h4>\n\n\n\n<p>Interv\u00e9n na regulaci\u00f3n do sistema inmunitario, que axuda a distinguir entre o que \u00e9 propio e o que \u00e9 alleo \u00f3 corpo.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Funci\u00f3n de protecci\u00f3n intestinal<\/h4>\n\n\n\n<p>Contrib\u00fae ao mantemento da barreira intestinal, impedindo a colonizaci\u00f3n por microorganismos potencialmente pat\u00f3xenos.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">A composici\u00f3n da microbiota<\/h3>\n\n\n\n<p>Cada vez hai m\u00e1is estudos que demostran que a composici\u00f3n da microbiota \u00e9 de gran relevancia no plano da sa\u00fade (2). \u00c9 importante <strong>mantela equilibrada e cunha gran diversidade<\/strong> de compo\u00f1entes. <\/p>\n\n\n\n<p>Non se co\u00f1ece a\u00ednda unha microbiota ideal v\u00e1lida para toda a poboaci\u00f3n. Pero identific\u00e1ronse alg\u00fans patr\u00f3ns asociados a unha mellor sa\u00fade metab\u00f3lica e inmunol\u00f3xica (1, 2):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Diversidade <\/strong>microbiana, que se considera un marcador b\u00e1sico para poder falar de estabilidade do ecosistema intestinal.<\/li>\n\n\n\n<li>Presenza equilibrada de x\u00e9neros omo <strong>Bacteroides, Bifidobacterium, Faecalibacterium e Lactobacillus.<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Eubiose e disbiose<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Eubiose<\/h4>\n\n\n\n<p>E <strong>eubiose <\/strong>d\u00e1se cando hai un estado de equilibro estrutural e funcional da microbiota intestinal. Cando isto sucede, mantense a simbiose co organismo e axuda a manter un bo estado de sa\u00fade (2, 3).<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Disbiose<\/h4>\n\n\n\n<p>A <strong>disbiose <\/strong>fai referencia \u00e1 alteraci\u00f3n do equilibro da microbiota intestinal. Sup\u00f3n cambios na s\u00faa composici\u00f3n, diversidade e funcionalidade, e xera danos na sa\u00fade (3). <\/p>\n\n\n\n<p>Este desequilibro pode producirse como consecuencia de:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Diminuci\u00f3n de microorganismos beneficiosos,<\/strong> implicados no mantemento da barreira intestinal e a regulaci\u00f3n da resposta inmunitaria (1).<\/li>\n\n\n\n<li><strong>Aumento de microorganismos con potencial proinflamatorio<\/strong>, capaces de favorecer a activaci\u00f3n do sistema inmunitario e a produci\u00f3n de mediadores inflamatorios (1).<\/li>\n\n\n\n<li><strong>A perda de diversidade microbiana,<\/strong> considerada un marcador de peor estado de sa\u00fade do ecosistema intestinal e de menor capacidade de adaptaci\u00f3n fronte a est\u00edmulos externos (1).<\/li>\n\n\n\n<li><strong>A combinaci\u00f3n de varias destas alteraci\u00f3ns<\/strong>, que d\u00e1 lugar a un ecosistema intestinal menos estable e funcional (1). <\/li>\n<\/ul>\n\n\n\n<p>A disbiose adoita relacionarse cun estado de <strong>inflamaci\u00f3n cr\u00f3nica de baixo grao<\/strong>, con alteraci\u00f3ns na <strong>barreira intestinal <\/strong>e cunha <strong>desregulaci\u00f3n da resposta inmunitaria<\/strong> (1). Estes factores poden ter repercusi\u00f3ns tanto a nivel local como sist\u00e9mico.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">O eixo intestino-cerebro<\/h3>\n\n\n\n<p>O <strong>eixo intetino-cerebro<\/strong> describe a comunicaci\u00f3n bidireccional entre o sistema nervioso central, o tracto gastrointestinal e a microbiota intestinal (6). <\/p>\n\n\n\n<p>Esta conexi\u00f3n prod\u00facese a trav\u00e9s das v\u00edas inmunol\u00f3xicas, hormonais, metab\u00f3licas e nerviosas. En consecuencia,<strong> o que ocorre no intestino pode influ\u00edr na funci\u00f3n cerebral, e viceversa.<\/strong><\/p>\n\n\n\n<p>Numerosos estudos sinalan unha posible relaci\u00f3n directa entre os estados disbiose intestinal e o desenvolvemento e progresi\u00f3n de m\u00faltiples procesos patol\u00f3xicos (2, 3):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Enfermidades inflamatorias intestinais.<\/li>\n\n\n\n<li>Trastornos funcionais dixestivos.<\/li>\n\n\n\n<li>Patolox\u00edas metab\u00f3licas.<\/li>\n\n\n\n<li>Envellecemento prematuro.<\/li>\n\n\n\n<li>Enfermidades neurol\u00f3xicas e autoinmunes, como a<strong> Esclerose M\u00faltiple<\/strong> (6).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Microbiota intestinal e EM<\/h3>\n\n\n\n<p>No caso da EM, a\u00ednda que a evidencia en seres humanos contin\u00faa en desenvolvemento, os estudos dispo\u00f1ibles mostran <strong>diferenzas na composici\u00f3n da microbiota intestinal <\/strong>en comparaci\u00f3n con persoas sen EM. <\/p>\n\n\n\n<p>Existe unha s\u00f3lida evidencia experimental que indica que a microbiota intestinal<strong> pode modular a resposta inmunitaria<\/strong> implicada na enfermidade (4, 5, 6). Isto \u00e9 debido a que a disbiose poder\u00eda favorecer:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Inflamaci\u00f3n cr\u00f3nica de baixo grao<\/strong>, que pode levar \u00e1 activaci\u00f3n persistente do sistema inmunitario.<\/li>\n\n\n\n<li><strong>Estr\u00e9s oxidativo<\/strong>, que se debe evitar na EM.<\/li>\n<\/ul>\n\n\n\n<p>Estes factores son relevantes na Esclerose M\u00faltiple, xa que poder\u00edan contribu\u00edr a procesos como a <strong>desmielinizaci\u00f3n, o dano axonal ou a neurodexeneraci\u00f3n<\/strong> (3, 5). <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Bibliograf\u00eda<\/h3>\n\n\n\n<p>(1) <a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC4528021\/\">https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC4528021\/<\/a><\/p>\n\n\n\n<p>(2) <a href=\"https:\/\/www.nature.com\/articles\/s41392-022-00974-4\">https:\/\/www.nature.com\/articles\/s41392-022-00974-4<\/a><\/p>\n\n\n\n<p>(3) <a href=\"https:\/\/www.medigraphic.com\/pdfs\/adm\/od-2025\/od254a.pdf\">https:\/\/www.medigraphic.com\/pdfs\/adm\/od-2025\/od254a.pdf<\/a><\/p>\n\n\n\n<p>(4) <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0213485315001802\">https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0213485315001802<\/a><\/p>\n\n\n\n<p>(5) <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S2173580824000324\">https:\/\/www.sciencedirect.com\/science\/article\/pii\/S2173580824000324<\/a><\/p>\n\n\n\n<p>(6) <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0213485319300829 \">https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0213485319300829 <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nos \u00faltimos anos, a microbiota intestinal converteuse nun dos campos&hellip; <a class=\"continue\" href=\"http:\/\/esclerosismultiplegalicia.org\/index.php\/2026\/02\/18\/o-papel-da-microbiota-intestinal-o-eixo-intestino-cerebro\/\">Ler m\u00e1is sobre<span> O papel da microbiota intestinal: o eixo intestino-cerebro<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":4292,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[103],"tags":[13,155],"class_list":["post-5016","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novas","tag-fegadem","tag-nutricion"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.1.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>O papel da microbiota intestinal: o eixo intestino-cerebro - FEGADEM<\/title>\n<meta name=\"description\" content=\"O estudo do eixo 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