
{"id":6502,"date":"2012-06-22T08:10:50","date_gmt":"2012-06-22T08:10:50","guid":{"rendered":"http:\/\/ibecbarcelona.eu\/new\/icomo-afrontan-las-celulas-la-presencia-de-agujeros-en-las-capas-epiteliales\/"},"modified":"2015-01-07T13:05:14","modified_gmt":"2015-01-07T13:05:14","slug":"icomo-afrontan-las-celulas-la-presencia-de-agujeros-en-las-capas-epiteliales","status":"publish","type":"post","link":"https:\/\/ibecbarcelona.eu\/es\/icomo-afrontan-las-celulas-la-presencia-de-agujeros-en-las-capas-epiteliales\/","title":{"rendered":"\u00bfC\u00f3mo afrontan las c\u00e9lulas la presencia de agujeros en las capas epiteliales?"},"content":{"rendered":"<\/h3>\n<p> Los epitelios (conjunto de c\u00e9lulas epiteliales conectadas entre s\u00ed), que forman la capa m\u00e1s externa de nuestra piel, a la vez que tapizan las cavidades internas, pueden presentar discontinuidades en diferentes situaciones. Estos agujeros pueden aparecer de forma natural en etapas del desarrollo, pero tambi\u00e9n como resultado de un hecho tan com\u00fan como hacerse un corte. Ante una discontinuidad en la capa epitelial, las c\u00e9lulas que la rodean se activan para cerrar el agujero y asegurar que el epitelio sigue siendo una capa continua e impermeable.<\/p>\n<p>Ahora, investigadores del Institut de Bioenginyeria de Catalunya (IBEC) han hallado una forma de estudiar el cierre de los agujeros que aparecen de forma natural durante diferentes etapas del desarrollo, aclarando los mecanismos de cierre durante el desarrollo, sin necesidad de tener en cuenta los profundos efectos de la muerte celular que tiene lugar en caso de lesi\u00f3n.<\/p>\n<p>\u201cEn los experimentos cl\u00e1sicos en epitelios da\u00f1ados se ha descrito lo que llamamos \u201cmecanismo de cordel\u201d, que implica la contracci\u00f3n de un cable celular formado a lo largo del margen del agujero, que se estira hasta cerrar la herida\u201d, explica Ester A\u00f1\u00f3n, autora principal de los resultados que aparecen hoy en la revista PNAS. \u201cOtro mecanismo que se ha identificado es la activaci\u00f3n de la maquinaria de protrusi\u00f3n, que comporta una expansi\u00f3n y migraci\u00f3n activas de las propias c\u00e9lulas hacia los extremos de la herida. Quer\u00edamos ver cu\u00e1l de estos dos mecanismos se activa durante el cierre de agujeros que aparecen naturalmente durante el desarrollo.\u201d<\/p>\n<p>Los investigadores de Barcelona, junto con sus colaboradores de Francia, Singapur y Nueva York, usaron una plantilla hecha con pilares para crear espacios bien definidos en tama\u00f1o y forma en una monocapa de c\u00e9lulas epiteliales. De esta manera, una vez retirados los pilares, pudieron ver c\u00f3mo las c\u00e9lulas respond\u00edan activamente al nuevo espacio de libre acceso, extendiendo lamelipodios \u2013 protrusiones anchas y finas de la membrana, ricas en una prote\u00edna llamada actina \u2013 y migrando hacia el agujero.<\/p>\n<p>\u201cNuestros resultados revelan que el cierre de discontinuidades epiteliales en ausencia de da\u00f1o celular se basa en la migraci\u00f3n colectiva de las c\u00e9lulas a trav\u00e9s de la extensi\u00f3n de protrusiones celulares, en vez del mecanismo de cordel, que es la respuesta m\u00e1s habitual a la mezcla de c\u00e9lulas muertas y restos que resulta de una herida,\u201d explica Ester. \u201cTambi\u00e9n vimos que la mera presencia de espacio libre parece ser suficiente para desencadenar esta respuesta.\u201d<\/p>\n<p>Los resultados descubiertos ayudar\u00e1n a entender mejor los mecanismos b\u00e1sicos de la migraci\u00f3n y el comportamiento celulares durante el desarrollo normal, lo que puede incrementar nuestro conocimiento de por qu\u00e9 ocurren las anormalidades y hacer avances importantes en el tratamiento de des\u00f3rdenes y enfermedades cong\u00e9nitas.  <\/p>\n<p>&#8212;<\/p>\n<p><span><a href=\"component\/option,com_jresearch\/id,33\/task,show\/view,member\/\">A\u00f1\u00f3n, E.<\/a>, <a href=\"component\/option,com_jresearch\/id,38\/task,show\/view,member\/\">Serra, X.<\/a>, Hersen, P., Gaulthier, N., Sheetz, M., <a href=\"component\/option,com_jresearch\/id,32\/task,show\/view,member\/\">Trepat, X.<\/a> &amp; Ladoux, B. (2012). <strong><a href=\"http:\/\/www.pnas.org\/content\/early\/2012\/06\/13\/1117814109\" target=\"_blank\" style=\"color: #484642; font-weight: bold;\">Cell crawling mediates collective cell migration to close undamaged epithelial gaps<\/a><\/strong>. PNAS, in press.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<h3><img decoding=\"async\" class=\"left size-full wp-image-6497 lazyload\" data-src=\"https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2012\/06\/picanon.jpg\" border=\"0\" width=\"200\" data-srcset=\"https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2012\/06\/picanon.jpg 356w, https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2012\/06\/picanon-150x150.jpg 150w, https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2012\/06\/picanon-300x300.jpg 300w, https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2012\/06\/picanon-45x45.jpg 45w\" data-sizes=\"(max-width: 356px) 100vw, 356px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 356px; --smush-placeholder-aspect-ratio: 356\/355;\" \/>Nuevos resultados sobre el cierre de discontinuidades en epitelios <\/p>\n","protected":false},"author":4,"featured_media":6497,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[97],"tags":[],"post_formats":[],"class_list":["post-6502","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-noticias-de-investigacion"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u00bfC\u00f3mo afrontan las c\u00e9lulas la presencia de agujeros en las capas epiteliales? - Institute for Bioengineering of Catalonia<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ibecbarcelona.eu\/es\/icomo-afrontan-las-celulas-la-presencia-de-agujeros-en-las-capas-epiteliales\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta 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