{"id":23726,"date":"2023-12-23T20:44:21","date_gmt":"2023-12-23T20:44:21","guid":{"rendered":"https:\/\/www.africa-press.net\/benin\/?p=23726"},"modified":"2023-12-21T21:02:09","modified_gmt":"2023-12-21T21:02:09","slug":"decouvrez-la-premiere-cartographie-3d-dune-tete-dembryon-humain","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/benin\/toutes-les-actualites\/decouvrez-la-premiere-cartographie-3d-dune-tete-dembryon-humain","title":{"rendered":"D\u00e9couvrez la premi\u00e8re cartographie 3D d&rsquo;une t\u00eate d&#8217;embryon humain"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Benin. <\/strong><\/span>Les images sont stupe\u0301fiantes. Il s\u2019agit la\u0300 de la premie\u0300re cartographie 3D d\u2019une te\u0302te d\u2019embryon, des travaux d\u2019une e\u0301quipe de scientifiques franc\u0327ais parues dans la revue Cell.<\/p>\n<p><b>La toute premie\u0300re carte tridimensionnelle d\u2019une te\u0302te embryonnaire humaine<\/b><\/p>\n<p>Pour re\u0301aliser cette prouesse, les diffe\u0301rentes e\u0301quipes (Inserm, CNRS, Sorbonne Universite\u0301, Institut de la vision, Universite\u0301 Claude Bernard Lyon 1, Hospices civils de Lyon), coordonne\u0301es par Alain Che\u0301dotal, prix de recherche Inserm 2017, ont eu recours a\u0300 des techniques alliant biochimie et une optique sophistique\u0301e, le microscope a\u0300 feuillet de lumie\u0300re.<\/p>\n<p>Re\u0301sultat: la toute premie\u0300re carte tridimensionnelle d\u2019une te\u0302te humaine embryonnaire. Regardez le re\u0301sultat avec cette image 3D de glande lacrymale dont les diffe\u0301rents e\u0301le\u0301ments ont e\u0301te\u0301 colorise\u0301s par un logiciel de re\u0301alite\u0301 virtuelle (voir image et vide\u0301o ci-dessous).<\/p>\n<p><b>La te\u0302te, la structure la plus complexe du corps humain<\/b><\/p>\n<p>Pour me\u0301moire, la te\u0302te est en effet la structure la plus complexe du corps humain. Car outre ses diffe\u0301rentes enveloppes protectrices (os, muscles, peau) elle contient bien su\u0302r le cerveau sans compter sur les e\u0301le\u0301ments vasculaires (arte\u0300res, veines), les nerfs sans oublier les glandes, celles dites endocrines (secre\u0301tant des hormones directement dans la circulation sanguine) comme l\u2019hypophyse, mais aussi les exocrines (secre\u0301tant des substances vers le milieu exte\u0301rieur) telles les glandes salivaires ou lacrymales.<\/p>\n<p>Les chercheurs travaillent depuis de\u0301ja\u0300 plusieurs anne\u0301es a\u0300 e\u0301lucider les me\u0301canismes qui contro\u0302lent le de\u0301veloppement de structures comme la te\u0302te, les malformations a\u0300 ce niveau e\u0301tant pre\u0301sentes chez environ un tiers des be\u0301be\u0301s pre\u0301sentant des anomalies conge\u0301nitales.<\/p>\n<p>Or, les connaissances actuelles sont a\u0300 ce jour encore tre\u0300s parcellaires et proviennent d\u2019e\u0301tudes re\u0301alise\u0301es pour la plupart dans la premie\u0300re moitie\u0301 du 20e sie\u0300cle, a\u0300 l\u2019aide de simples coupes anatomiques et d&rsquo;analyses de tissus. C\u2019est tout l\u2019inte\u0301re\u0302t de l\u2019application de ces techniques re\u0301centes dites de transparisation ou\u0300 tout commence avec le recueil d\u2019embryons, tous issus d\u2019une biobanque de tissus humains constitue\u0301e a\u0300 vise\u0301e de recherche, a\u0300 diffe\u0301rents stades du de\u0301veloppement.<\/p>\n<p><b>\u00ab\u00a0De\u0301couvrir des caracte\u0301ristiques jusqu\u2019alors inconnues du de\u0301veloppement des muscles, des nerfs et des vaisseaux sanguins\u00a0\u00bb<\/b><\/p>\n<p>Les organes sont, dans un premier temps et gra\u0302ce a\u0300 diffe\u0301rents lavages par des bains chimiques, rendus transparents a\u0300 la lumie\u0300re. Ensuite, les e\u0301chantillons peuvent e\u0302tre image\u0301s en 3D a\u0300 l\u2019aide du microscope a\u0300 feuillet de lumie\u0300re, qui les scanne avec une fine feuille de lumie\u0300re laser. Ce qui permet de localiser in situ avec une pre\u0301cision ine\u0301gale\u0301e les cellules constituant les tissus embryonnaires.<\/p>\n<p>\u00ab\u00a0Cela nous a permis de de\u0301couvrir des caracte\u0301ristiques jusqu\u2019alors inconnues du de\u0301veloppement des muscles, des nerfs et des vaisseaux sanguins cra\u0302niens, du cra\u0302ne et des glandes exocrines cra\u0302niennes, pre\u0301cise Alain Che\u0301dotal dans le communique\u0301 de presse de l\u2019Inserm. Par exemple, les tout premiers stades de de\u0301veloppement des glandes salivaires et lacrymales n\u2019avaient jamais pu e\u0302tre e\u0301tudie\u0301s chez l\u2019e\u0302tre humain. Nos travaux nous ont permis de commencer a\u0300 visualiser et a\u0300 mieux comprendre les me\u0301canismes a\u0300 l\u2019origine de leur mise en place\u00a0\u00bb, ajoute-t-il.<\/p>\n<p>Image 3D obtenue en microscope a\u0300 feuillet de lumie\u0300re d\u2019une glande lacrymale d\u2019embryon humain de 12 semaines transparise\u0301. Les diffe\u0301rents e\u0301le\u0301ments de la glande ont e\u0301te\u0301 colorise\u0301s a\u0300 l\u2019aide d\u2019un logiciel de re\u0301alite\u0301 virtuelle. Cre\u0301dits: Raphae\u0308l Blain\/Alain Che\u0301dotal, Institut de la vision (Inserm\/CNRS\/Sorbonne Universite\u0301)<\/p>\n<p><b>Prochaine e\u0301tape: cartographier toutes les cellules de la re\u0301tine<\/b><\/p>\n<p>Ces travaux poursuivent un but bien pre\u0301cis: mieux comprendre le de\u0301veloppement des structures complexes comme la te\u0302te humaine et, par conse\u0301quence, les anomalies conge\u0301nitales responsables des malformations.<\/p>\n<p>Les chercheurs ont aussi cre\u0301e\u0301 une interface web, Hudeca, permettant de partager les images obtenues, mais e\u0301galement d\u2019acce\u0301der a\u0300 des mode\u0300les pour l\u2019impression 3D et a\u0300 des reconstructions 3D interactives d\u2019embryons humains. Prochaine e\u0301tape: cartographier toutes les cellules de la re\u0301tine.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/benin\">Benin<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Benin. Les images sont stupe\u0301fiantes. Il s\u2019agit la\u0300 de la premie\u0300re cartographie 3D d\u2019une te\u0302te d\u2019embryon, des travaux d\u2019une e\u0301quipe de scientifiques franc\u0327ais parues dans la revue Cell. La toute premie\u0300re carte tridimensionnelle d\u2019une te\u0302te embryonnaire humaine Pour re\u0301aliser cette prouesse, les diffe\u0301rentes e\u0301quipes (Inserm, CNRS, Sorbonne Universite\u0301, Institut de la vision, Universite\u0301 [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":23725,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,50,45],"class_list":["post-23726","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-benin","tag-benin"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>D\u00e9couvrez la premi\u00e8re cartographie 3D d&#039;une t\u00eate d&#039;embryon humain - B\u00e9nin<\/title>\n<meta name=\"description\" content=\"Les images sont stupe\u0301fiantes. 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