{"id":20132,"date":"2022-11-30T13:28:08","date_gmt":"2022-11-30T12:28:08","guid":{"rendered":"https:\/\/congopubonline.com\/?p=20132"},"modified":"2022-12-07T10:28:53","modified_gmt":"2022-12-07T09:28:53","slug":"les-globules-rouges-du-futur-du-sang-synthetique-a-ete-transfuse-pour-la-premiere-fois-a-des-humains","status":"publish","type":"post","link":"https:\/\/congopubonline.com\/?p=20132","title":{"rendered":"\u00ab\u00a0Les globules rouges du futur\u00a0\u00bb : du sang synth\u00e9tique a \u00e9t\u00e9 transfus\u00e9 pour la premi\u00e8re fois \u00e0 des humains"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Certains groupes sanguins sont tr\u00e8s rares, et le sang en stock vient \u00e0 manquer. Des chercheurs ont trouv\u00e9 la solution : le fabriquer en laboratoire.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les syst\u00e8mes de groupe sanguins ABO et Rh\u00e9sus sont les plus connus, et vous pensiez peut-\u00eatre qu&rsquo;il n&rsquo;y en avait pas d&rsquo;autres. Il en existe pourtant bien d&rsquo;autres : au total, on en compte 40. Si la classification traditionnelle (ABO avec rh\u00e9sus positif ou n\u00e9gatif) comprend 8 groupes (A+, A-, B+, B-, AB+, AB-, O+, O), qui correspondent \u00e0 98% des besoins en transfusions, on en recense en fait 380, dont 250 sont consid\u00e9r\u00e9s comme rares. Ces groupes sanguins rares, souvent n\u00e9s d&rsquo;anomalies, concernent, selon l&rsquo;EFS (\u00c9tablissement Fran\u00e7ais du Sang), entre 700 000 et un millions de Fran\u00e7ais, dont une majorit\u00e9 ne sont pas au courant.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans le cas de maladies rares comme la dr\u00e9panocytose, qui n\u00e9cessite des transfusions sanguines r\u00e9guli\u00e8res, la correspondance entre le sang du donneur et celle du receveur doit \u00eatre \u00ab\u00a0parfaitement compatible\u00a0\u00bb, afin d&rsquo;\u00e9viter un rejet par l&rsquo;organisme. Or, certains groupes sont si rares qu&rsquo;il n&rsquo;existe que tr\u00e8s peu de donneurs potentiels. En Europe, par exemple, seule une personne sur un million poss\u00e8de le groupe sanguin \u00ab\u00a0Bombay\u00a0\u00bb.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour r\u00e9gler ce probl\u00e8me vital, des chercheurs britanniques tentent de cultiver du sang en laboratoire, afin de pouvoir en fabriquer \u00e0 volont\u00e9, avec le groupe souhait\u00e9. Au Bristol BioDesign Institute (BBI), des scientifiques manipulent ainsi des globules rouges depuis 2009, et sont r\u00e9cemment parvenus \u00e0 transfuser, pour la toute premi\u00e8re fois, du \u00ab\u00a0sang synth\u00e9tique\u00a0\u00bb \u00e0 des humains.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/d1fmx1rbmqrxrr.cloudfront.net\/cnet\/i\/edit\/2022\/11\/sang-synthetique-720.jpg\" alt=\"\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>50 milliards de globules rouges produits en laboratoire<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les cellules sanguines fabriqu\u00e9es en laboratoire ont \u00e9t\u00e9 cultiv\u00e9es \u00e0 partir de cellules souches provenant de donneurs. En effet, les cellules souches sanguines sont immatures et peuvent se transformer en n&rsquo;importe quelle cellule sanguine : globules rouges, globules blancs ou plaquettes. Concr\u00e8tement, apr\u00e8s un don de sang \u00ab\u00a0classique\u00a0\u00bb, les chercheurs ont utilis\u00e9 des \u00ab\u00a0billes magn\u00e9tiques\u00a0\u00bb pour d\u00e9tecter les cellules souches sanguines capables de devenir des globules rouges. Ils les ont ensuite extraites, puis d\u00e9velopp\u00e9es en grand nombre en laboratoire, avant de les \u00ab\u00a0guider\u00a0\u00bb pour qu&rsquo;elles deviennent des globules rouges.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Selon le BBI, le processus dure 3 semaines, et permet de transformer 500 000 cellules souches en 50 milliards de globules rouges. Parmi ceux-ci, apr\u00e8s un \u00ab\u00a0filtrage\u00a0\u00bb, 15 milliards peuvent \u00eatre transfus\u00e9s, car \u00ab\u00a0au bon stade de d\u00e9veloppement\u00a0\u00bb. \u00ab\u00a0Demain, nous pourrons produire autant de sang que possible, avec des salles pleines de machines produisant continuellement du sang synth\u00e9tique \u00e0 partir de dons de sang classiques\u00a0\u00bb, affirme le chercheur Ashley Toye, professeur de biologie cellulaire \u00e0 l&rsquo;universit\u00e9 de Bristol, \u00e0 la BBC. Sur le site du BBI, il estime \u00e9galement que cet essai clinique de transfusion sanguine, baptis\u00e9 RESTORE, \u00ab\u00a0est un \u00e9norme pas en avant pour la fabrication de sang \u00e0 partir de cellules souches\u00a0\u00bb. Selon lui, \u00ab\u00a0c&rsquo;est la premi\u00e8re fois que du sang cultiv\u00e9 en laboratoire \u00e0 partir d&rsquo;un donneur allog\u00e8ne est transfus\u00e9 et il reste maintenant \u00e0 voir comment les cellules se comportent \u00e0 la fin de l&rsquo;essai clinique.\u00a0\u00bb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les donneurs qui font partie de cet essai clinique, organis\u00e9 en partenariat avec le National Health Service Blood and Transplant (NHSBT) , sont pour l&rsquo;instant au nombre de deux, mais l&rsquo;objectif des chercheurs est de tester ce sang synth\u00e9tique sur au moins 10 volontaires sains. Ceux-ci devraient recevoir deux injections de 5 \u00e0 10 ml (l&rsquo;\u00e9quivlent de quelques cuill\u00e8res \u00e0 caf\u00e9) \u00e0 4 mois d&rsquo;intervalle ; l&rsquo;un de sang normal, l&rsquo;autre de sang cultiv\u00e9 en labo. Comme l&rsquo;explique le BBI, le sang de synth\u00e8se a \u00e9t\u00e9 marqu\u00e9 avec une substance radioactive, et les scientifiques pourront gr\u00e2ce \u00e0 ce proc\u00e9d\u00e9 analyser la dur\u00e9e pendant laquelle il demeure dans le corps.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Vers du sang \u00ab\u00a0sur commande\u00a0\u00bb<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">RESTORE a en effet pour objectif de comparer la dur\u00e9e de vie des cellules souches sanguines cultiv\u00e9es en laboratoire, par rapport \u00e0 celle des globules rouges \u00ab\u00a0standards\u00a0\u00bb provenant du m\u00eame donneur, qui est de 120 jours environ. Selon les chercheurs, \u00e9tant donn\u00e9 que les cellules cultiv\u00e9es en laboratoire sont \u00ab\u00a0toutes fra\u00eeches\u00a0\u00bb, elles devraient \u00eatre \u00ab\u00a0plus performantes\u00a0\u00bb et efficaces que celles issues de transfusions de sang naturel, qui contiennent des cellules d&rsquo;\u00e2ge diff\u00e9rent.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00ab\u00a0En outre, si les cellules fabriqu\u00e9es durent plus longtemps dans l&rsquo;organisme, les patients qui ont r\u00e9guli\u00e8rement besoin de sang pourraient ne pas avoir besoin de transfusions aussi fr\u00e9quentes, et les espacer. Cela permettrait ainsi de limiter les cas de surcharge en fer (une accumulation de fer dans l&rsquo;organisme due \u00e0 de trop nombreuses transfusions sanguines), qui peut entra\u00eener de graves complications (cirrhoses, diab\u00e8te, risques de cancer du foie)\u00a0\u00bb, \u00e9crivent les scientifiques britanniques.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A plus long terme, ces recherches pourraient d\u00e9boucher sur la \u00ab\u00a0fabrication de cellules sanguines sur commande\u00a0\u00bb. Cela permettrait de r\u00e9aliser des transfusions \u00ab\u00a0en toute s\u00e9curit\u00e9\u00a0\u00bb sur des personnes atteintes de dr\u00e9panocytose et \u00ab\u00a0difficiles \u00e0 transfuser, car ayant d\u00e9velopp\u00e9 des anticorps contre la plupart des groupes sanguins de donneurs\u00a0\u00bb. L&rsquo;\u00e9tape suivante serait enfin la production de nouveaux traitements et de m\u00e9dicaments gr\u00e2ce \u00e0 tout ce sang (frais) de synth\u00e8se.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ces essais prometteurs ne doivent toutefois pas occulter une r\u00e9alit\u00e9, que m\u00eame ces globules rouges du futur n&rsquo;effaceront pas : le besoin de dons du sang \u00ab\u00a0standards\u00a0\u00bb. Selon le NHS, il y aura toujours besoin de dons pour subvenir aux besoins des personnes dont le groupe sanguin est \u00ab\u00a0courant\u00a0\u00bb, tout autant que pour fournir aux chercheurs les cellules souches essentielles \u00e0 la production de sang de synth\u00e8se.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Fabien Soyez<br>CNetFrance<\/strong> <strong>via CONGO PUB Online<\/strong><\/p>\n<div class='epvc-post-count'><span class='epvc-eye'><\/span>  <span class=\"epvc-count\"> 465<\/span><span class='epvc-label'> Vues<\/span><\/div>","protected":false},"excerpt":{"rendered":"<p>Certains groupes sanguins sont tr\u00e8s rares, et le sang en stock vient \u00e0 manquer. Des chercheurs ont trouv\u00e9 la solution : le fabriquer en laboratoire. Les syst\u00e8mes de groupe sanguins&hellip;<\/p>\n","protected":false},"author":1,"featured_media":20133,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","_monsterinsights_skip_tracking":false,"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[60],"tags":[],"class_list":["post-20132","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sante"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.4 (Yoast SEO v28.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>&quot;Les globules rouges du futur&quot; : du sang synth\u00e9tique a \u00e9t\u00e9 transfus\u00e9 pour la premi\u00e8re fois \u00e0 des humains - Congo Pub Online<\/title>\n<meta name=\"description\" content=\"&quot;Les globules rouges du futur&quot; : du sang synth\u00e9tique a \u00e9t\u00e9 transfus\u00e9 pour la premi\u00e8re fois \u00e0 des humains\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/congopubonline.com\/?p=20132\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"&quot;Les globules rouges du futur&quot; : du sang synth\u00e9tique a \u00e9t\u00e9 transfus\u00e9 pour la premi\u00e8re fois \u00e0 des humains\" \/>\n<meta property=\"og:description\" content=\"&quot;Les globules rouges du futur&quot; : du sang synth\u00e9tique a \u00e9t\u00e9 transfus\u00e9 pour la premi\u00e8re fois \u00e0 des humains\" \/>\n<meta property=\"og:url\" content=\"https:\/\/congopubonline.com\/?p=20132\" \/>\n<meta property=\"og:site_name\" content=\"Congo Pub Online\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/web.facebook.com\/Congopubonline\" \/>\n<meta property=\"article:published_time\" content=\"2022-11-30T12:28:08+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-12-07T09:28:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/congopubonline.com\/wp-content\/uploads\/2022\/11\/sang-artificiel_jpeg_711_473_1.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"711\" \/>\n\t<meta property=\"og:image:height\" content=\"473\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"admin9775\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@CONGOPUBOnline\" \/>\n<meta name=\"twitter:site\" content=\"@CONGOPUBOnline\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin9775\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/congopubonline.com\\\/?p=20132#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/congopubonline.com\\\/?p=20132\"},\"author\":{\"name\":\"admin9775\",\"@id\":\"https:\\\/\\\/congopubonline.com\\\/#\\\/schema\\\/person\\\/d2f3a940be2e9c1a0e4f8831e203f3cc\"},\"headline\":\"\u00ab\u00a0Les globules rouges du futur\u00a0\u00bb : du sang synth\u00e9tique a \u00e9t\u00e9 transfus\u00e9 pour la premi\u00e8re fois \u00e0 des humains\",\"datePublished\":\"2022-11-30T12:28:08+00:00\",\"dateModified\":\"2022-12-07T09:28:53+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/congopubonline.com\\\/?p=20132\"},\"wordCount\":964,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/congopubonline.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/congopubonline.com\\\/?p=20132#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/congopubonline.com\\\/wp-content\\\/uploads\\\/2022\\\/11\\\/sang-artificiel_jpeg_711_473_1.jpeg\",\"articleSection\":[\"Sant\u00e9\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/congopubonline.com\\\/?p=20132#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/congopubonline.com\\\/?p=20132\",\"url\":\"https:\\\/\\\/congopubonline.com\\\/?p=20132\",\"name\":\"\\\"Les globules rouges du futur\\\" : du sang synth\u00e9tique a \u00e9t\u00e9 transfus\u00e9 pour la premi\u00e8re fois \u00e0 des humains - 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