{"id":6501,"date":"2012-06-22T08:10:50","date_gmt":"2012-06-22T08:10:50","guid":{"rendered":"http:\/\/ibecbarcelona.eu\/new\/com-afronten-les-celmlules-la-presencia-de-forats-en-les-capes-epitelials\/"},"modified":"2015-01-08T15:40:40","modified_gmt":"2015-01-08T15:40:40","slug":"com-afronten-les-celmlules-la-presencia-de-forats-en-les-capes-epitelials","status":"publish","type":"post","link":"https:\/\/ibecbarcelona.eu\/ca\/com-afronten-les-celmlules-la-presencia-de-forats-en-les-capes-epitelials\/","title":{"rendered":"Com afronten les c\u00e8l\u00b7lules la presencia de forats \u2028en les capes epitelials?"},"content":{"rendered":"

\u00a0<\/p>\n

Els epitelis (conjunt de c\u00e8l\u00b7lules epitelials connectades entre elles), que formen la capa mes externa de la nostra pell alhora que tapissen les cavitats internes, poden presentar discontinu\u00eftats en diferents situacions. Aquests forats poden apar\u00e8ixer de forma natural en etapes del desenvolupament per\u00f2 tamb\u00e9 com a resultat d\u2019un fet tan com\u00fa com fer-se un tall. En front una discontinu\u00eftat en la capa epitelial, les c\u00e8l.lules que l\u2019envolten s\u2019activen per tancar el forat i assegurar que l\u2019epiteli segueix sent una capa continua i impermeable.<\/p>\n

Ara, investigadors de l\u2019Institut de Bioenginyeria de Catalunya (IBEC) han trobat una manera d\u2019estudiar el tancament dels forats que apareixen de forma natural durant diferents etapes del desenvolupament, esclarint els mecanismes de tancament durant el desenvolupament, sense haver de tenir en compte els profunds efectes de la mort cel\u00b7lular que t\u00e9 lloc en cas de lesi\u00f3.<\/p>\n

\u201cEn els experiments cl\u00e0ssics en epitelis danyats, s\u2019ha descrit el que anomenem \u2018mecanisme de cordill\u2019, que implica la contracci\u00f3 d\u2019un cable cellular format al marge del forat, que s\u2019estreny fins tancar la ferida\u201d explica l\u2019Ester A\u00f1\u00f3n, autora principal dels resultats que apareixen avui a la revista PNAS. \u201cUn altre mecanisme que s\u2019ha identificat \u00e9s l\u2019activaci\u00f3 de la maquinaria de protrusi\u00f3, que comporta una expansi\u00f3 i migraci\u00f3 actives de les pr\u00f2pies c\u00e8l\u00b7lules als extrems de la ferida. Vol\u00edem veure quin d\u2019aquests dos mecanismes s\u2019activa durant el tancament de forats que apareixen naturalment durant el desenvolupament.\u201d<\/p>\n

Els investigadors de Barcelona, junt amb els seus col\u00b7laboradors de Fran\u00e7a, Singapur i Nova York van fer servir una plantilla feta de pilars per a crear espais ben definits en mida i forma en una monocapa de c\u00e8l\u00b7lules epitelials. D\u2019aquesta manera, un cop retirats els pilars, van poder veure com les c\u00e8l\u00b7lules responien activament al nou espai de lliure acc\u00e9s estenent lamel\u00b7lipodis \u2013 protrusions amples i primes de la membrana, riques en una prote\u00efna anomenada actina \u2013 i migrant envers el forat.<\/p>\n

\u201cEls nostres resultats revelen que el tancament de discontinuitats epitelials en abs\u00e8ncia de dany cel\u00b7lular es basa en la migraci\u00f3 col\u00b7lectiva de les c\u00e8l\u00b7lules a trav\u00e9s de l\u2019extensio de protrusions cel.lulars, en lloc del mecanisme de cordill, que \u00e9s la resposta m\u00e9s habitual a la barreja de c\u00e8l\u00b7lules mortes i restes que resulta d\u2019una ferida,\u201d explica l\u2019Ester. \u201cTamb\u00e9 vam veure que la mera pres\u00e8ncia d\u2019espai lliure sembla ser suficient per desencadenar aquesta resposta.\u201d<\/p>\n

Els resultats descoberts ajudaran a entre millor els mecanismes b\u00e0sics de la migraci\u00f3 i el comportament cel\u00b7lulars durant el desenvolupament normal, de manera que pot incrementar el nostre coneixement de per qu\u00e8 ocorren les anormalitats i fer aven\u00e7os importants en el tractament de desordres i malalties cong\u00e8nits.<\/p>\n

—<\/p>\n

A\u00f1\u00f3n, E.<\/a>, Serra, X.<\/a>, Hersen, P., Gaulthier, N., Sheetz, M., Trepat, X.<\/a> & Ladoux, B. (2012). Cell crawling mediates collective cell migration to close undamaged epithelial gaps<\/a><\/strong>. PNAS, in press.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Nous resultats sobre el tancament de discontinu\u00eftats en epitelis<\/h3>\n

\u00a0<\/p>\n","protected":false},"author":4,"featured_media":6497,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[96],"tags":[],"post_formats":[],"class_list":["post-6501","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-noticies-de-recerca"],"yoast_head":"\nCom afronten les c\u00e8l\u00b7lules la presencia de forats \u2028en les capes epitelials? - 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\/ca\/com-afronten-les-celmlules-la-presencia-de-forats-en-les-capes-epitelials\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Com afronten les c\u00e8l\u00b7lules la presencia de 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