{"id":75678,"date":"2026-03-17T14:18:00","date_gmt":"2026-03-17T14:18:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/reactivation-dun-cerveau-de-souris-congele-a-140c"},"modified":"2026-04-19T18:02:16","modified_gmt":"2026-04-19T18:02:16","slug":"reactivation-dun-cerveau-de-souris-congele-a-140c","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/reactivation-dun-cerveau-de-souris-congele-a-140c","title":{"rendered":"R\u00e9activation d\u2019un cerveau de souris congel\u00e9 \u00e0 -140\u00b0C"},"content":{"rendered":"<p><span class=\"ap-article-header-tag\"> <strong>Africa-Press &#8211; Senegal. <\/strong> <\/span>Le cerveau peut-il rester fonctionnel apre\u0300s e\u0302tre congele\u0301? La re\u0301ponse a\u0300 cette question e\u0301tait facile: non, car le froid extre\u0302me cause la formation de cristaux qui endommagent les cellules et cassent les circuits neuronaux ne\u0301cessaires au bon fonctionnement de cet organe. Mais une nouvelle technique pourrait nous obliger a\u0300 changer cette re\u0301ponse. Le 3 mars 2026, des chercheurs de l\u2019Universite\u0301 Friedrich-Alexander d\u2019Erlangen-Nuremberg en Allemagne ont pre\u0301sente\u0301 dans la revue Pnas une approche de conge\u0301lation qui sauvegarde le tissu ce\u0301re\u0301bral de souris et pre\u0301serve les synapses, qui restent fonctionnelles apre\u0300s la de\u0301conge\u0301lation. Cette avance\u0301e phe\u0301nome\u0301nale pourrait faciliter l\u2019e\u0301tude de cet organe et montre que la cryoge\u0301nisation pourrait fonctionner sur des organes humains entiers, et pas seulement sur des cellules ou des embryons.<\/p>\n<p>Congeler les cellules en e\u0301vitant la formation des cristaux<\/p>\n<p>La recherche tente de congeler les cerveaux depuis au moins les anne\u0301es 1950, mais a\u0300 chaque fois, ces tentatives e\u0301chouaient a\u0300 cause de la perte des synapses, ces connexions entre neurones qui relaient l\u2019information a\u0300 travers le cerveau. Ces zones de contact entre deux cellules sont tre\u0300s fragiles, car le moindre petit mouvement peut se\u0301parer les neurones et empe\u0302cher leur communication. Elles peuvent donc e\u0302tre facilement perturbe\u0301es par la formation de cristaux, ce qui arrive naturellement lorsque les mole\u0301cules d\u2019eau dans les corps ge\u0300lent. Pour e\u0301viter cette cristallisation, les chercheurs utilisent de\u0301sormais la vitrification: dans cette technique, une partie de l\u2019eau des tissus biologiques est remplace\u0301e par des solvants qui ne cristallisent pas lors de la conge\u0301lation.<\/p>\n<p>\u00ab Pour notre e\u0301tude, nous avons utilise\u0301 une solution de vitrification nomme\u0301e V3, qui consiste en un me\u0301lange de dime\u0301thylsulfoxyde (un solvant utilise\u0301 comme cryoprotecteur pour la conge\u0301lation de cellules, ndlr), de l\u2019e\u0301thyle\u0300ne glycol (utilise\u0301 comme antigel pour les voitures), du formamide (solvant utilise\u0301 dans l\u2019industrie) et de l\u2019eau \u00bb, nous explique Alex German, auteur de l\u2019e\u0301tude. \u00ab Quand on expose cette solution a\u0300 un refroidissement rapide, ces solvants bloquent les interactions entre les mole\u0301cules d\u2019eau qui normalement formeraient des cristaux et causeraient ainsi des de\u0301placements nanoscopiques du tissu. \u00bb<\/p>\n<p>Une me\u0301thode difficile a\u0300 mettre au point<\/p>\n<p>Plusieurs e\u0301quipes avaient re\u0301ussi a\u0300 mettre au point la technique chez des rongeurs, mais pour d\u2019autres organes, dont le c\u0153ur et le foie. Mais la conge\u0301lation du cerveau restait hors d\u2019atteinte, a\u0300 cause de la difficulte\u0301 a\u0300 pre\u0301server les synapses. Mais Alex German et son e\u0301quipe sont parvenus a\u0300 trouver les conditions propices, en jouant sur diffe\u0301rents facteurs: niveau de de\u0301shydratation du cerveau, concentration de la solution V3, tempe\u0301ratures, vitesses de refroidissement pour la conge\u0301lation et re\u0301chauffement pour la de\u0301conge\u0301lation&#8230; \u00ab Le protocole pour le cerveau en entier implique la de\u0301shydratation du cerveau pour remplacer cette eau par la solution, re\u0301duisant la masse de l\u2019organe a\u0300 environ 70% de sa taille originale, de\u0301taille-t-il. Mais si la de\u0301shydratation diminue au-dessous de 45% de la masse normale, le tissu ne re\u0301pond plus apre\u0300s la de\u0301conge\u0301lation. \u00bb<\/p>\n<p>Les synapses restent fonctionnelles me\u0302me apre\u0300s une tempe\u0301rature de -140\u00b0C<\/p>\n<p>Gra\u0302ce a\u0300 ce protocole optimise\u0301, les neurones redevenaient actifs apre\u0300s la de\u0301conge\u0301lation, et les synapses restaient fonctionnelles: \u00ab On a e\u0301te\u0301 surpris de la bonne re\u0301cupe\u0301ration des tissus, me\u0302me s\u2019il y avait quelques alte\u0301rations dans l\u2019excitabilite\u0301 de certaines populations de neurones, re\u0301ve\u0300le Alex German. Par exemple, les cellules pyramidales dans l\u2019hippocampe avaient une excitabilite\u0301 re\u0301duite, alors que celle-ci n\u2019e\u0301tait pas modifie\u0301e chez d\u2019autres neurones. Ces diffe\u0301rences pourraient e\u0302tre cause\u0301es par les variations de la taille des cellules, des proprie\u0301te\u0301s des membranes, ou l\u2019activite\u0301 me\u0301tabolique intrinse\u0300que de chaque cellule, qui affecte comment elles ge\u0300rent le stress osmotique et la toxicite\u0301 des solvants. La technique peut encore e\u0302tre ame\u0301liore\u0301e. \u00bb<\/p>\n<p>Les cerveaux pouvaient e\u0302tre garde\u0301s a\u0300 -140\u00b0C pendant plusieurs jours, tout en gardant leur structure et leur fonction. \u00ab A\u0300 des tempe\u0301ratures au-dessous de -130\u00b0C, tous les processus dynamiques a\u0300 l\u2019inte\u0301rieur du cerveau se mettent comple\u0300tement en pause, et cet e\u0301tat est stable de fac\u0327on permanente: des embryons humains peuvent ainsi e\u0302tre utilise\u0301s me\u0302me apre\u0300s trois de\u0301cennies dans cet e\u0301tat vitrifie\u0301, avance-t-il. La limite est le peu de temps que le tissu reste fonctionnel apre\u0300s la de\u0301conge\u0301lation, car le tissu se de\u0301grade apre\u0300s 10 a\u0300 15 heures. \u00bb<\/p>\n<p>Une technique qui n\u2019est pas encore pre\u0302te pour le cerveau humain<\/p>\n<p>Cette technique a de\u0301ja\u0300 e\u0301te\u0301 teste\u0301e avec succe\u0300s pour des coupes de cortex humain, mais la vitrification du cerveau en entier reste impossible&#8230; pour le moment. \u201cNos syste\u0300mes de refroidissement et de re\u0301chauffement ne peuvent pas fonctionner pour des organes de cette taille, il nous faudrait des approches qui permettent de de\u0301passer les limites actuelles dans le transfert de chaleur, ainsi que de meilleures solutions de vitrification, conclut-il. La cryostase pour les humains est encore tre\u0300s loin.\u201d<\/p>\n<p class=\"ap-article-footer-note\">Retrouvez plus d\u2019actualit\u00e9s et d\u2019analyses sur <span class=\"ap-highlight-country\">Senegal<\/span> sur le site <span class=\"ap-highlight-brand\">Africa Press<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Senegal. Le cerveau peut-il rester fonctionnel apre\u0300s e\u0302tre congele\u0301? La re\u0301ponse a\u0300 cette question e\u0301tait facile: non, car le froid extre\u0302me cause la formation de cristaux qui endommagent les cellules et cassent les circuits neuronaux ne\u0301cessaires au bon fonctionnement de cet organe. Mais une nouvelle technique pourrait nous obliger a\u0300 changer cette re\u0301ponse. [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":75677,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-75678","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"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>R\u00e9activation d\u2019un cerveau de souris congel\u00e9 \u00e0 -140\u00b0C - Senegal<\/title>\n<meta name=\"description\" content=\"-article-header-tag&quot;&gt; Africa-Press - Senegal. 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