{"id":19607,"date":"2024-04-24T13:56:59","date_gmt":"2024-04-24T11:56:59","guid":{"rendered":"https:\/\/staging.wp-ibdm.nicolasg.fr\/et-pourtant-ils-diffusent\/"},"modified":"2024-04-25T15:04:31","modified_gmt":"2024-04-25T13:04:31","slug":"et-pourtant-ils-diffusent","status":"publish","type":"post","link":"https:\/\/staging.wp-ibdm.nicolasg.fr\/fr\/et-pourtant-ils-diffusent\/","title":{"rendered":"Et pourtant ils diffusent!"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"19607\" class=\"elementor elementor-19607 elementor-19600\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7aa502d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7aa502d\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-305ae95\" data-id=\"305ae95\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-8c26fb3 elementor-widget elementor-widget-text-editor\" data-id=\"8c26fb3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Les ligands Wnt sont des prot\u00e9ines de signalisation qui jouent un r\u00f4le important dans l&#8217;embryogen\u00e8se et l&#8217;hom\u00e9ostasie des tissus adultes. Ils sont g\u00e9n\u00e9ralement produits par des cellules sources et activent la voie de signalisation Wnt dans des cellules cibles \u00e9loign\u00e9es de cette source. Bien qu&#8217;ils aient \u00e9t\u00e9 largement \u00e9tudi\u00e9s, les m\u00e9canismes par lesquels les ligands Wnt se propagent dans les tissus ne sont toujours pas clairs.   <\/p>\n<p>Dans cette \u00e9tude, les \u00e9quipes Lenne et Bertrand ont \u00e9tudi\u00e9 comment les ligands Wnt se propagent dans les tissus en d\u00e9veloppement des embryons de C. elegans. Elles ont identifi\u00e9 les sources de Wnt et montr\u00e9 que les ligands peuvent \u00eatre d\u00e9tect\u00e9s \u00e0 distance de ces cellules. En utilisant la spectroscopie de corr\u00e9lation de fluorescence (FCS), ils ont d\u00e9montr\u00e9 que les mol\u00e9cules Wnt sont s\u00e9cr\u00e9t\u00e9es et diffusent librement entre les cellules dans l&#8217;espace extracellulaire. De mani\u00e8re significative, ils ont observ\u00e9 que ce processus de diffusion \u00e9tait suffisamment rapide pour que les Wnt nouvellement s\u00e9cr\u00e9t\u00e9es atteignent les cellules cibles en un temps inf\u00e9rieur au cycle cellulaire.    <span style=\"color: var( --e-global-color-text ); font-family: var( --e-global-typography-text-font-family ), Sans-serif; font-size: var( --e-global-typography-text-font-size ); font-weight: var( --e-global-typography-text-font-weight ); letter-spacing: var( --e-global-typography-text-letter-spacing );\">Enfin, ils ont utilis\u00e9 dans des simulations num\u00e9riques les coefficients de diffusion mesur\u00e9s exp\u00e9rimentalement pour proposer un mod\u00e8le dans lequel la diffusion des ligands Wnt \u00e9tablit la polarit\u00e9 dans le tissu en d\u00e9veloppement. <\/span><\/p>\n<p><b><span style=\"color: var( --e-global-color-text ); font-family: var( --e-global-typography-text-font-family ), Sans-serif; font-size: var( --e-global-typography-text-font-size ); letter-spacing: var( --e-global-typography-text-letter-spacing );\">Ce travail fournit de nouvelles informations sur la dynamique de la diffusion des ligands Wnt et de la signalisation \u00e0 longue port\u00e9e.<\/span><span style=\"color: var( --e-global-color-text ); font-family: var( --e-global-typography-text-font-family ), Sans-serif; font-size: var( --e-global-typography-text-font-size ); letter-spacing: var( --e-global-typography-text-letter-spacing );\"> <\/span><\/b><\/p>\n<p><a style=\"font-family: var( --e-global-typography-text-font-family ), Sans-serif; font-size: var( --e-global-typography-text-font-size ); font-weight: var( --e-global-typography-text-font-weight ); letter-spacing: var( --e-global-typography-text-letter-spacing ); background-color: #ffffff;\" href=\"http:\/\/Wnt%20ligands%20are%20signaling%20proteins%20that%20play%20an%20important%20role%20in%20embryogenesis%20and%20adult%20tissue%20homeostasis.%20They%20are%20typically%20produced%20by%20source%20cells%20and%20activate%20the%20Wnt%20signaling%20pathway%20in%20target%20cells%20located%20distant%20from%20the%20source.%20While%20extensively%20studied,%20the%20mechanisms%20by%20which%20Wnt%20ligands%20spread%20within%20tissues%20remained%20unclear.%20In%20this%20study,%20the%20Lenne%20and%20Bertrand%20teams%20investigated%20how%20Wnt%20ligands%20propagate%20in%20the%20developing%20tissue%20of%20C.%20elegans%20embryos.%20They%20identified%20the%20sources%20of%20Wnt%20and%20showed%20that%20the%20ligands%20can%20be%20detected%20at%20a%20distance%20from%20these%20cells.%20Using%20fluorescence%20correlation%20spectroscopy%20(FCS),%20they%20demonstrated%20that%20Wnt%20molecules%20are%20secreted%20and%20diffuse%20freely%20between%20cells%20in%20the%20extracellular%20space.%20Significantly,%20they%20observed%20that%20this%20diffusion%20process%20was%20rapid%20enough%20for%20newly%20secreted%20Wnts%20to%20reach%20target%20cells%20within%20a%20time%20shorter%20than%20the%20cell%20cycle.%20Finally,%20they%20employed%20experimentally%20measured%20diffusion%20coefficients%20in%20numerical%20simulations%20to%20propose%20a%20model%20where%20Wnt%20ligand%20diffusion%20establishes%20polarity%20in%20the%20developing%20tissue.%20This%20work%20provides%20novel%20insights%20into%20the%20dynamics%20of%20Wnt%20spreading%20and%20long-range%20signaling.<\/p>%20<p><a%20href=\" target=\"_blank\" rel=\"noopener\">R<\/a><font face=\"var( --e-global-typography-text-font-family ), Sans-serif\"><span style=\"font-weight: var( --e-global-typography-text-font-weight ); letter-spacing: var( --e-global-typography-text-letter-spacing ); background-color: rgb(255, 255, 255);\"><a href=\"https:\/\/doi.org\/10.1016\/j.cub.2024.03.030\" target=\"_blank\" rel=\"noopener\">ecouvreux et al., Transfer of polarity information via diffusion of Wnt ligands in C. elegans embryos, Current Biology (2024), https:\/\/doi.org\/10.1016\/j.cub.2024.03.030<\/a><\/span><\/font><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d1d3379 elementor-widget elementor-widget-button\" data-id=\"d1d3379\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/staging.wp-ibdm.nicolasg.fr\/fr\/team\/approches-physiques-de-la-dynamique-cellulaire-et-de-la-morphogenese-tissulaire\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">RENCONTRER L'\u00c9QUIPE LENNE <\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8b68bbb elementor-widget elementor-widget-button\" data-id=\"8b68bbb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/staging.wp-ibdm.nicolasg.fr\/fr\/team\/polarisation-et-decisions-binaires-du-destin-cellulaire-dans-le-systeme-nerveux\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\"><span>BERTRAND RENCONTRER L'\u00c9QUIPE BERTRAND<\/span><\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Dans les embryons de C. elegans les ligands Wnt diffusent dans le tissu pour polariser des cellules \u00e0 distance.<\/p>\n","protected":false},"author":3,"featured_media":19603,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[79],"tags":[],"class_list":["post-19607","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-fr","ibdm_team-team-101","ibdm_team-team-104"],"acf":[],"_links":{"self":[{"href":"https:\/\/staging.wp-ibdm.nicolasg.fr\/fr\/wp-json\/wp\/v2\/posts\/19607","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/staging.wp-ibdm.nicolasg.fr\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/staging.wp-ibdm.nicolasg.fr\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/staging.wp-ibdm.nicolasg.fr\/fr\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/staging.wp-ibdm.nicolasg.fr\/fr\/wp-json\/wp\/v2\/comments?post=19607"}],"version-history":[{"count":7,"href":"https:\/\/staging.wp-ibdm.nicolasg.fr\/fr\/wp-json\/wp\/v2\/posts\/19607\/revisions"}],"predecessor-version":[{"id":19623,"href":"https:\/\/staging.wp-ibdm.nicolasg.fr\/fr\/wp-json\/wp\/v2\/posts\/19607\/revisions\/19623"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/staging.wp-ibdm.nicolasg.fr\/fr\/wp-json\/wp\/v2\/media\/19603"}],"wp:attachment":[{"href":"https:\/\/staging.wp-ibdm.nicolasg.fr\/fr\/wp-json\/wp\/v2\/media?parent=19607"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/staging.wp-ibdm.nicolasg.fr\/fr\/wp-json\/wp\/v2\/categories?post=19607"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/staging.wp-ibdm.nicolasg.fr\/fr\/wp-json\/wp\/v2\/tags?post=19607"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}