{"id":378464,"date":"2026-08-14T19:29:11","date_gmt":"2026-08-14T19:29:11","guid":{"rendered":"http:\/\/6a7f354bcb6e9b54e23f2fa0"},"modified":"2026-08-14T19:29:11","modified_gmt":"2026-08-14T19:29:11","slug":"este-podria-ser-el-vinculo-que-hemos-buscado-entre-las-bacterias-del-intestino-y-el-alzheimer","status":"publish","type":"post","link":"https:\/\/sarmiento24h.com\/?p=378464","title":{"rendered":"Este podr\u00eda ser el v\u00ednculo que hemos buscado entre las bacterias del intestino y el Alzheimer"},"content":{"rendered":"<p>Desde hace a\u00f1os, los cient\u00edficos saben que el microbioma intestinal de las personas con Alzheimer presenta diferencias respecto al de personas sanas. Lo que todav\u00eda no est\u00e1 claro es qu\u00e9 implican esas diferencias: podr\u00edan ser consecuencia de la enfermedad, contribuir a ella o simplemente acompa\u00f1arla. Es posible que una parte del enigma resida, m\u00e1s que en las bacterias intestinales, en las mol\u00e9culas que producen y que terminan circulando por el cuerpo.<\/p>\n<p>Un equipo de cient\u00edficos cree haber encontrado una de esas mol\u00e9culas. En un estudio publicado en <a href=\"https:\/\/www.nature.com\/articles\/s41467-026-74744-z\">Nature Communications<\/a>, los investigadores identificaron el propionato de imidazol (ImP), un compuesto producido por ciertas bacterias intestinales, como posible v\u00ednculo entre el microbioma y el Alzheimer.<\/p>\n<hr>\n<div class=\"ContentCardEmbedWrapper-hkvhYu kMYDit content-card-embed content-card-embed--stacked\" data-testid=\"ContentCardEmbedWrapper\" readability=\"20.974789915966\">\n<div class=\"ContentCardEmbedImage-bqahne fjmzkP content-card-embed__image\" data-testid=\"ContentCardEmbedImage\"><span class=\"SpanWrapper-kFnjvc eKnjjD responsive-asset\"><picture class=\"ResponsiveImagePicture-jKunQM gjCCFj responsive-image\"><img decoding=\"async\" alt=\"Concepto de un escaneo cerebral para identificar demencia.\" loading=\"lazy\" class=\"ResponsiveImageContainer-dkeESL cQPiWi responsive-image__image\" srcset=\"https:\/\/media.es.wired.com\/photos\/69fe3068e0ceba7da52e3bdf\/master\/w_120,c_limit\/GettyImages-941361062.jpg 120w, https:\/\/media.es.wired.com\/photos\/69fe3068e0ceba7da52e3bdf\/master\/w_240,c_limit\/GettyImages-941361062.jpg 240w, https:\/\/media.es.wired.com\/photos\/69fe3068e0ceba7da52e3bdf\/master\/w_320,c_limit\/GettyImages-941361062.jpg 320w, https:\/\/media.es.wired.com\/photos\/69fe3068e0ceba7da52e3bdf\/master\/w_640,c_limit\/GettyImages-941361062.jpg 640w, https:\/\/media.es.wired.com\/photos\/69fe3068e0ceba7da52e3bdf\/master\/w_768,c_limit\/GettyImages-941361062.jpg 768w\" sizes=\"100vw\" src=\"https:\/\/media.es.wired.com\/photos\/69fe3068e0ceba7da52e3bdf\/master\/w_775%2Cc_limit\/GettyImages-941361062.jpg\"><\/picture><\/span><\/div>\n<div class=\"ContentCardEmbedInfo-buyHWH gWLOee\" readability=\"22.285714285714\">\n<div class=\"BaseText-fEwdHD ContentCardEmbedHed-kDKGDs iUENtL dlHXUJ content-card-embed__hed\" data-testid=\"ContentCardEmbedHed\"><a class=\"BaseLink-haTOKm ContentCardEmbedHedLink-iBZsco ILkR hhUFQU content-card-embed__hed-link link\" href=\"https:\/\/es.wired.com\/articulos\/8-habitos-sencillos-que-reducen-el-riesgo-de-alzheimer\" data-testid=\"ContentCardEmbedHedLink\">8 h\u00e1bitos sencillos que reducen el riesgo de Alzheimer y otras formas de demencia<\/a><\/div>\n<p>Desde comer huevo hasta pasar m\u00e1s tiempo con amigos, los h\u00e1bitos para reducir el riesgo de demencia y Alzheimer suelen ser bastante sencillos de realizar.<\/p>\n<\/div>\n<\/div>\n<hr>\n<h2>Del intestino al cerebro<\/h2>\n<p>La hip\u00f3tesis que plantean los investigadores comienza en el intestino. Algunas bacterias utilizan un amino\u00e1cido llamado histidina y, al metabolizarla, producen ImP. Parte de esa mol\u00e9cula puede pasar a la sangre y circular por el organismo.<\/p>\n<p>El problema comienza en la frontera del cerebro. Los experimentos del nuevo estudio indican que el ImP puede debilitar la <a href=\"https:\/\/es.wired.com\/articulos\/este-farmaco-a-base-de-cobre-busca-frenar-el-alzheimer-y-mejorar-la-memoria\">barrera hematoencef\u00e1lica<\/a>, la estructura que protege al cerebro y controla qu\u00e9 sustancias pueden pasar desde la sangre hacia el tejido cerebral. Una barrera menos eficaz facilitar\u00eda la entrada del propio metabolito al cerebro, donde los investigadores encontraron que puede interactuar directamente con las neuronas.<\/p>\n<p>Ah\u00ed aparecen dos protagonistas centrales del Alzheimer: las prote\u00ednas beta-amiloide y tau. En un cerebro con Alzheimer, la beta-amiloide se acumula formando placas entre las neuronas. Tau, por su parte, sufre modificaciones anormales que alteran su funcionamiento y favorecen la formaci\u00f3n de estructuras da\u00f1inas dentro de las c\u00e9lulas. Ambos fen\u00f3menos est\u00e1n estrechamente relacionados con el deterioro de las neuronas y constituyen dos de las principales caracter\u00edsticas biol\u00f3gicas de la enfermedad.<\/p>\n<p><strong>En los experimentos, el ImP parece tener la capacidad de empeorar ambos.<\/strong> Los investigadores encontraron que puede favorecer la acumulaci\u00f3n de <a href=\"https:\/\/es.wired.com\/articulos\/una-molecula-podria-reactivar-las-defensas-naturales-del-cerebro-contra-el-alzheimer\">placas de beta-amiloide<\/a> y aumentar la modificaci\u00f3n de tau mediante un proceso conocido como fosforilaci\u00f3n.<\/p>\n<p>El modelo que presenta el estudio funciona como una cadena: ciertas bacterias intestinales producen ImP, el metabolito llega al torrente sangu\u00edneo, puede deteriorar la barrera hematoencef\u00e1lica y alcanzar el interior del cerebro y, una vez all\u00ed, favorecer cambios relacionados con beta-amiloide y tau.<\/p>\n<p>Pero que una explicaci\u00f3n biol\u00f3gica sea coherente no significa que toda esa cadena est\u00e9 ocurriendo realmente en el cuerpo humano. Para comprobar hasta d\u00f3nde llegaba la relaci\u00f3n, los investigadores buscaron primero sus huellas en humanos y despu\u00e9s pusieron a prueba distintas partes del mecanismo en ratones y c\u00e9lulas.<\/p>\n<hr>\n<hr>\n<h2>Las pistas en humanos y ratones<\/h2>\n<p>Los cient\u00edficos analizaron el ImP presente en la sangre de 1,196 adultos cognitivamente sanos, cuya edad media era de 61.2 a\u00f1os. Quienes ten\u00edan niveles m\u00e1s elevados del metabolito obtuvieron, en promedio, peores resultados en pruebas cognitivas. Tambi\u00e9n presentaron niveles m\u00e1s altos de pTau-217, una forma modificada de la prote\u00edna tau utilizada como biomarcador del Alzheimer, y de NfL, una prote\u00edna que se libera en mayor cantidad cuando las neuronas sufren da\u00f1o. Ambas pueden <a href=\"https:\/\/es.wired.com\/articulos\/este-analisis-de-sangre-promete-revelar-la-edad-biologica-de-tus-organos-por-separado\">medirse en la sangre<\/a> y ofrecen pistas de cambios en el cerebro incluso antes de que aparezcan s\u00edntomas evidentes.<\/p>\n<p>Los investigadores tambi\u00e9n contaban con pruebas cognitivas y mediciones de biomarcadores realizadas a lo largo del tiempo. Al comparar a las personas con los niveles m\u00e1s altos y m\u00e1s bajos de ImP, encontraron que el primer grupo mostraba un deterioro cognitivo m\u00e1s r\u00e1pido con el paso del tiempo.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Desde hace a\u00f1os, los cient\u00edficos saben que&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":378465,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[46],"tags":[],"class_list":["post-378464","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tecnologia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - 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