{"id":117670,"date":"2026-04-12T04:27:09","date_gmt":"2026-04-12T04:27:09","guid":{"rendered":"http:\/\/69d94c968a39f17fcfa5d411"},"modified":"2026-04-12T04:27:09","modified_gmt":"2026-04-12T04:27:09","slug":"por-que-no-podemos-regenerar-extremidades-como-los-anfibios","status":"publish","type":"post","link":"https:\/\/sarmiento24h.com\/?p=117670","title":{"rendered":"Por qu\u00e9 no podemos regenerar extremidades como los anfibios"},"content":{"rendered":"<div><img decoding=\"async\" src=\"https:\/\/media.es.wired.com\/photos\/69d94c9662068e5eebdb73ce\/16:9\/w_1280,c_limit\/1074790118\" class=\"ff-og-image-inserted\"><\/div>\n<p>Algunos anfibios son capaces de regenerar partes de su cuerpo, como extremidades e incluso \u00f3rganos. Pero hasta ahora, este extraordinario proceso hab\u00eda permanecido en gran medida en el misterio. Un reciente estudio realizado por un equipo de investigadores de la Escuela Polit\u00e9cnica Federal de Lausana (EPFL) ha a\u00f1adido ahora una pieza m\u00e1s al rompecabezas. Seg\u00fan este estudio, el ox\u00edgeno desempe\u00f1a un papel crucial en la regeneraci\u00f3n de las extremidades: cuando las c\u00e9lulas lo perciben, esto determinar\u00eda si el proceso de regeneraci\u00f3n puede comenzar. El <a href=\"https:\/\/www.science.org\/doi\/10.1126\/science.adw8526\" target=\"_blank\">estudio<\/a> se public\u00f3 en <em>Science<\/em>.<\/p>\n<h2>Los anfibios pueden regenerar extremidades, los mam\u00edferos no<\/h2>\n<p>La regeneraci\u00f3n de las extremidades comienza con la cicatrizaci\u00f3n de las heridas. En efecto, tras una amputaci\u00f3n, las c\u00e9lulas del lugar de la lesi\u00f3n deben sellar r\u00e1pidamente la herida y transformarse en c\u00e9lulas regenerativas. Aunque sabemos que en los anfibios este proceso se desarrolla sin problemas, en los mam\u00edferos se detiene pronto. Esto se debe a que el cierre de la herida es m\u00e1s lento y la formaci\u00f3n de tejido cicatricial toma el relevo, bloqueando as\u00ed la regeneraci\u00f3n. Seg\u00fan los expertos, esta diferencia entre anfibios y mam\u00edferos radica en el entorno: las larvas de los anfibios, en efecto, se desarrollan en el agua, donde hay niveles de <a href=\"https:\/\/www.wired.it\/scienza\/medicina\/2019\/10\/07\/cellule-ossigeno-nobel-medicina-2019\/\" target=\"_blank\">ox\u00edgeno<\/a> m\u00e1s bajos que en el aire, al que est\u00e1n expuestos los tejidos de los mam\u00edferos. Aunque muchos estudios han demostrado que especies regenerativas como los anfibios y los mam\u00edferos comparten genes similares, lo que sugiere que <strong>los mam\u00edferos pueden conservar una capacidad regenerativa latente<\/strong>, a\u00fan no estaba claro si los tejidos de los mam\u00edferos pod\u00edan activar realmente programas de regeneraci\u00f3n de extremidades y qu\u00e9 les imped\u00eda hacerlo\u00bb, recuerda Can Aztekin, uno de los autores del nuevo estudio.<\/p>\n<h2>Niveles de ox\u00edgeno y capacidad para percibirlos<\/h2>\n<p>Para entenderlo, los investigadores amputaron las extremidades en desarrollo de renacuajos de rana y embriones de rat\u00f3n y los cultivaron fuera del organismo en condiciones de ox\u00edgeno controladas, es decir, bajando sus niveles para simular entornos acu\u00e1ticos o aument\u00e1ndolos hasta los del aire. A continuaci\u00f3n, controlaron la respuesta celular midiendo el cierre de heridas, el movimiento celular, la actividad g\u00e9nica, el metabolismo y los estados epigen\u00e9ticos, centr\u00e1ndose en particular en HIF1A, una prote\u00edna que act\u00faa como sensor de ox\u00edgeno celular y que, cuando el ox\u00edgeno es bajo, se vuelve m\u00e1s estable y activa los programas de cicatrizaci\u00f3n y regeneraci\u00f3n.<\/p>\n<h2>Respuestas celulares al entorno<\/h2>\n<p>En an\u00e1lisis posteriores, los investigadores observaron que, cuando se reduc\u00edan los niveles de ox\u00edgeno, las c\u00e9lulas de los ratones cicatrizaban m\u00e1s r\u00e1pido las heridas y mostraban signos de activaci\u00f3n de un programa regenerativo. La privaci\u00f3n de ox\u00edgeno tambi\u00e9n modific\u00f3 el comportamiento de las c\u00e9lulas de la piel, que se volvieron m\u00e1s m\u00f3viles y cambiaron sus propiedades mec\u00e1nicas. En el caso de los renacuajos de rana, sin embargo, sus extremidades se regeneraron con eficacia en una amplia gama de niveles de ox\u00edgeno, incluso muy superiores a los que se encuentran normalmente en el aire. Al comparar todos estos datos, el equipo lleg\u00f3 a la conclusi\u00f3n de que los anfibios que consiguen regenerar sus extremidades muestran una capacidad reducida para detectar el ox\u00edgeno mientras que, por el contrario, los mam\u00edferos reaccionan fuertemente al ox\u00edgeno, desestabilizando HIF1A y desactivando as\u00ed los programas regenerativos en las primeras fases, es decir, inmediatamente despu\u00e9s de una lesi\u00f3n. En conclusi\u00f3n, aunque el estudio no demuestra que la regeneraci\u00f3n de las extremidades humanas sea inminente, pone de relieve que las diferencias entre especies pueden depender de c\u00f3mo respondan las c\u00e9lulas a su entorno.<\/p>\n<p><em>Art\u00edculo originalmente publicado en<\/em> <a href=\"https:\/\/www.wired.it\/article\/perche-anfibi-riescono-a-rigenerare-propri-arti-mammiferi-no-chiave-questo-mistero-ossigeno\/\">WIRED Italia<\/a><em>. Adaptado por Mauricio Serfatty Godoy.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Algunos anfibios son capaces de regenerar partes&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":117671,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_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}},"categories":[46],"tags":[],"class_list":["post-117670","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tecnologia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Por qu\u00e9 no podemos regenerar extremidades como los anfibios - 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