{"id":187653,"date":"2020-01-22T09:26:46","date_gmt":"2020-01-22T09:26:46","guid":{"rendered":"https:\/\/afrikmag.com\/var\/www\/vhosts\/afrikmag.compublic_html\/?p=187653"},"modified":"2020-01-22T09:26:48","modified_gmt":"2020-01-22T09:26:48","slug":"decouverte-dune-cellule-immunitaire-qui-detruit-la-plupart-des-types-de-cancer","status":"publish","type":"post","link":"https:\/\/afrikmag.com\/var\/www\/vhosts\/afrikmag.compublic_html\/decouverte-dune-cellule-immunitaire-qui-detruit-la-plupart-des-types-de-cancer\/","title":{"rendered":"D\u00e9couverte d&rsquo;une cellule immunitaire qui d\u00e9truit la plupart des types de cancer"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Les scientifiques ont d\u00e9couvert une nouvelle \u00ab\u00a0cellule immunitaire tueuse\u00a0\u00bb qui pourrait \u00eatre utilis\u00e9e comme rem\u00e8de \u00ab\u00a0universel\u00a0\u00bb contre le cancer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Des chercheurs de l&rsquo;Universit\u00e9 de Cardiff ont d\u00e9couvert une \u00ab\u00a0cellule T\u00a0\u00bb trouv\u00e9e dans le sang humain qui reconna\u00eet et tue de nombreux types de cancer tout en ignorant les cellules saines. Les chercheurs sugg\u00e8rent que la cellule pourrait \u00eatre utilis\u00e9e pour d\u00e9velopper un traitement contre le cancer \u00abtaille unique\u00bb.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les th\u00e9rapies \u00e0 base de cellules T pour le cancer &#8211; o\u00f9 les cellules immunitaires sont retir\u00e9es, modifi\u00e9es et renvoy\u00e9es dans le sang du patient pour rechercher et d\u00e9truire les cellules canc\u00e9reuses &#8211; sont le dernier paradigme des traitements contre le cancer. Le plus utilis\u00e9 est le CAR-T et est personnalis\u00e9 pour chaque patient. Cependant, il ne cible qu&rsquo;un nombre limit\u00e9 de cancers et n&rsquo;a pas r\u00e9ussi pour les tumeurs solides, qui constituent la majorit\u00e9 des cancers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mais les scientifiques ont d\u00e9couvert des cellules T \u00e9quip\u00e9es d&rsquo;un nouveau type de r\u00e9cepteur des cellules T (TCR) qui peut distinguer les cellules saines des cellules malades &#8211; ne tuant que les cellules canc\u00e9reuses, rapporte Metro UK.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le professeur Andrew Sewell, auteur principal de l&rsquo;\u00e9tude de l&rsquo;\u00c9cole de m\u00e9decine de l&rsquo;Universit\u00e9 de Cardiff, a d\u00e9clar\u00e9 qu&rsquo;il \u00e9tait \u00ab\u00a0tr\u00e8s inhabituel\u00a0\u00bb de trouver un TCR avec une telle sp\u00e9cificit\u00e9 contre le cancer, ce qui a ouvert la perspective d&rsquo;une th\u00e9rapie universelle contre le cancer.<br>\n*Il a ajout\u00e9: \u00ab\u00a0Nous esp\u00e9rons que ce nouveau TCR peut nous fournir une voie diff\u00e9rente pour cibler et d\u00e9truire un large \u00e9ventail de cancers chez tous les individus.\u00a0\u00bb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00ab\u00a0Les th\u00e9rapies actuelles \u00e0 base de TCR ne peuvent \u00eatre utilis\u00e9es que chez une minorit\u00e9 de patients atteints d&rsquo;une minorit\u00e9 de cancers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00ab\u00a0Le ciblage du cancer via des lymphocytes T restreints par MR1 est une nouvelle fronti\u00e8re passionnante &#8211; il ouvre la perspective d&rsquo;un traitement anticanc\u00e9reux\u00a0\u00bb unique \u00ab\u00a0; un seul type de lymphocytes T qui pourrait \u00eatre capable de d\u00e9truire de nombreux types de cancers dans la population.<br>\n\u00ab\u00a0Auparavant, personne ne pensait que cela pouvait \u00eatre possible.\u00a0\u00bb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les cellules T conventionnelles scannent la surface des autres cellules pour trouver des anomalies et \u00e9liminer les cellules canc\u00e9reuses, mais ignorent les cellules qui ne contiennent que des prot\u00e9ines \u00ab\u00a0normales\u00a0\u00bb. Le balayage reconna\u00eet de petites parties des prot\u00e9ines cellulaires qui sont li\u00e9es aux mol\u00e9cules de surface cellulaire appel\u00e9es antig\u00e8ne leucocytaire humain (HLA), permettant aux cellules T tueuses de voir ce qui se passe \u00e0 l&rsquo;int\u00e9rieur des cellules en balayant leur surface.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mais l&rsquo;\u00e9tude, publi\u00e9e dans Nature Immunology, d\u00e9crit un TCR unique qui peut reconna\u00eetre de nombreux types de cancer via une seule mol\u00e9cule de type HLA appel\u00e9e MR1. Contrairement \u00e0 HLA, MR1 ne varie pas dans la population humaine, ce qui signifie qu&rsquo;il s&rsquo;agit d&rsquo;une nouvelle cible extr\u00eamement attrayante pour les immunoth\u00e9rapies.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En laboratoire, il a \u00e9t\u00e9 d\u00e9montr\u00e9 que les cellules T \u00e9quip\u00e9es du nouveau TCR tuent les cellules canc\u00e9reuses du poumon, de la peau, du sang, du c\u00f4lon, du sein, des os, de la prostate, des ovaires, des reins et du col de l&rsquo;ut\u00e9rus, tout en ignorant les cellules saines.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour tester le potentiel th\u00e9rapeutique de ces cellules in vivo, les chercheurs ont inject\u00e9 des cellules T capables de reconna\u00eetre MR1 chez des souris porteuses d&rsquo;un cancer humain et poss\u00e9dant un syst\u00e8me immunitaire humain.<br>\nLes scientifiques disent que cela a montr\u00e9 une \u00e9limination du cancer encourageante, comparable \u00e0 la th\u00e9rapie CAR-T maintenant approuv\u00e9e par le NHS dans un mod\u00e8le animal similaire.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ils ont \u00e9galement pu d\u00e9montrer que les cellules T de patients atteints de m\u00e9lanome modifi\u00e9s pour exprimer ce nouveau TCR pouvaient d\u00e9truire non seulement les propres cellules canc\u00e9reuses du patient, mais \u00e9galement les cellules canc\u00e9reuses d&rsquo;autres patients en laboratoire, quel que soit le type HLA du patient.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les chercheurs exp\u00e9rimentent actuellement pour d\u00e9terminer le m\u00e9canisme mol\u00e9culaire pr\u00e9cis par lequel le nouveau TCR fait la distinction entre les cellules saines et le cancer. Ils esp\u00e8rent tester la nouvelle approche chez les patients vers la fin de l&rsquo;ann\u00e9e<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les scientifiques ont d\u00e9couvert une nouvelle \u00ab\u00a0cellule immunitaire tueuse\u00a0\u00bb qui pourrait \u00eatre utilis\u00e9e comme rem\u00e8de \u00ab\u00a0universel\u00a0\u00bb contre le cancer. Des chercheurs de l&rsquo;Universit\u00e9 de Cardiff ont d\u00e9couvert une \u00ab\u00a0cellule T\u00a0\u00bb trouv\u00e9e dans le sang humain qui reconna\u00eet et tue de nombreux types de cancer tout en ignorant les cellules saines. Les chercheurs sugg\u00e8rent que la &hellip;<\/p>\n","protected":false},"author":37,"featured_media":187657,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7220],"tags":[1426,160812,1987],"class_list":["post-187653","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science","tag-cancer","tag-cellule-immunitaire","tag-scientifiques"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>D\u00e9couverte d&#039;une cellule immunitaire qui d\u00e9truit la plupart des types de cancer<\/title>\n<meta name=\"description\" content=\"Les scientifiques ont d\u00e9couvert une nouvelle &quot;cellule immunitaire tueuse&quot; qui pourrait \u00eatre utilis\u00e9e comme rem\u00e8de &quot;universel&quot; contre le cancer.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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