{"id":30946,"date":"2018-03-09T09:24:47","date_gmt":"2018-03-09T09:24:47","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/papel-de-los-la%c2%adpidos-de-membrana-en-la-capacitacion-y-reaccion-acrosomica-del-espermatozoide-de-macho-cabra%c2%ado-estudios-biofa%c2%adsicos\/"},"modified":"2018-03-09T09:24:47","modified_gmt":"2018-03-09T09:24:47","slug":"papel-de-los-la%c2%adpidos-de-membrana-en-la-capacitacion-y-reaccion-acrosomica-del-espermatozoide-de-macho-cabra%c2%ado-estudios-biofa%c2%adsicos","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/papel-de-los-la%c2%adpidos-de-membrana-en-la-capacitacion-y-reaccion-acrosomica-del-espermatozoide-de-macho-cabra%c2%ado-estudios-biofa%c2%adsicos\/","title":{"rendered":"Papel de los l\u00edpidos de membrana en la capacitaci\u00f3n y reacci\u00f3n acrosomica del espermatozoide de macho cabr\u00edo: estudios biof\u00edsicos"},"content":{"rendered":"<h2>Tesis doctoral de <strong> M\u00f3nica Compa\u00f1\u00f3 Casanovas <\/strong><\/h2>\n<p>La p\u00e9rdida de colesterol de las membranas juega un papel importante en la capacitaci\u00f3n y la reacci\u00f3n acros\u00f3mica (ra) del espermatozoide. En esta tesis se ha establecido el efecto de la salida de colesterol sobre la \u00abfluidez\u00bb de la membrana plasm\u00e1tica y sobre la ra del espermatozoide de macho cabr\u00edo.  la incubaci\u00f3n de los espermatozoides en beta-ciclodextrina (betacd) 8 mm como aceptor de colesterol dio lugar a una salida de aproximadamente el 50% del colesterol de la membranas y a un 35% de ra. Esta salida de colesterol no iba acompa\u00f1ada de salida de fosfol\u00edpicos, hecho que indica la preservaci\u00f3n de las membranas. No obstante, cuando s\u00f3lo se eliminaba el 30% de colesterol no se induc\u00eda ra. Dicha salida es muy r\u00e1pida, sigue una cin\u00e9tica exponencial decreciente con un tiempo de semivida de aproximadamente 10 min., Llegando al nivel asintom\u00e1tico al cabo de unos 30 min. Esta cin\u00e9tica contrasta con la cin\u00e9tica lenta de la ra; se necesitan casi 2h para alcanzar el m\u00e1ximo porcentaje de ra. Se concluye que, la salida de colesterol, por s\u00ed sola, induce ra.  utilizando la anisotrop\u00eda de fluorescencia del 1,6-difenil-1,3,5-hexatrieno (dph) se estudi\u00f3 el comportamiento termotr\u00f3pico de los l\u00edpidos de membrana despu\u00e9s de 1h., De incubaci\u00f3n de los espermatozoides en presencia o ausencia de betacd 8mm. Los datos experimentales se ajustaron a curvas sigmoidales en las cuales se distinguieron dos transiciones de fase, atribuibles a diferentes dominios lip\u00eddicos. As\u00ed pues, en las membranas de los espermatozoides coexiten regiones fluidas con regiones claramente m\u00e1s r\u00edgidas. La salida de colesterol dio lugar a importantes cambios en la extensi\u00f3n de dichas transiciones, indicando un incremento de la fuidez de algunos microdominios lip\u00eddicos, as\u00ed como una reorganizaci\u00f3n lateral de dichos dominios, justo antes del inicio de la ra.  para establecer cu\u00e1les de estos macrodominios estaban implicados en la salida de colesterol se<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Papel de los l\u00edpidos de membrana en la capacitaci\u00f3n y reacci\u00f3n acrosomica del espermatozoide de macho cabr\u00edo: estudios biof\u00edsicos<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Papel de los l\u00edpidos de membrana en la capacitaci\u00f3n y reacci\u00f3n acrosomica del espermatozoide de macho cabr\u00edo: estudios biof\u00edsicos <\/li>\n<li><strong>Autor:<\/strong>\u00a0 M\u00f3nica Compa\u00f1\u00f3 Casanovas <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Aut\u00f3noma de barcelona<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 21\/06\/2004<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Antoni Morros Carulla<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: cristina Templado meseguer <\/li>\n<li>sergi Bonet marull (vocal)<\/li>\n<li>africa De madariaga de las heras (vocal)<\/li>\n<li>angel Mozo villarias (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de M\u00f3nica Compa\u00f1\u00f3 Casanovas La p\u00e9rdida de colesterol de las membranas juega un papel importante en la capacitaci\u00f3n [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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