{"id":9131,"date":"2025-09-05T07:57:12","date_gmt":"2025-09-05T05:57:12","guid":{"rendered":"https:\/\/rvh-synergie.org\/actualites\/letude-montre-comment-le-tabagisme-entraine-un-cancer-du-pancreas\/"},"modified":"2025-09-05T07:57:26","modified_gmt":"2025-09-05T05:57:26","slug":"letude-montre-comment-le-tabagisme-entraine-un-cancer-du-pancreas","status":"publish","type":"post","link":"https:\/\/rvh-synergie.org\/actualites\/letude-montre-comment-le-tabagisme-entraine-un-cancer-du-pancreas\/","title":{"rendered":"L&rsquo;\u00e9tude montre comment le tabagisme entra\u00eene un cancer du pancr\u00e9as"},"content":{"rendered":"<div>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2025\/study-shows-how-smokin.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/hires\/2025\/study-shows-how-smokin.jpg\" data-sub-html=\"IL-22 producing cells are present only after exposure to chemical carcinogen. Credit: Rogel Cancer Center\">\n<figure class=\"article-img\">\n<\/figure><\/div>\n<\/div>\n<p>Une nouvelle \u00e9tude explique pourquoi les fumeurs ont plus de chances de d\u00e9velopper un cancer du pancr\u00e9as et pourquoi ils ont tendance \u00e0 avoir de moins bons r\u00e9sultats que les non-fumeurs.<\/p>\n<p>Des chercheurs de l&rsquo;Universit\u00e9 du Michigan Health Rogel Cancer Center ont trouv\u00e9 une cellule sp\u00e9cifique qui r\u00e9pond aux toxines environnementales telles que celles trouv\u00e9es dans les cigarettes. Lorsque les toxines se lient aux cellules, cela conduit \u00e0 la lib\u00e9ration d&rsquo;une prot\u00e9ine, l&rsquo;interleukine-22, provoquant une croissance agressive des tumeurs chez les souris atteintes d&rsquo;un cancer du pancr\u00e9as.<\/p>\n<p>Digger Deeper a conduit l&rsquo;\u00e9quipe \u00e0 identifier un type de cellule immunitaire super-suppresseur qui alimente cette r\u00e9ponse tout en emp\u00eachant le syst\u00e8me immunitaire de lutter contre la croissance tumorale.<\/p>\n<p>L&rsquo;\u00e9tude est publi\u00e9e dans <i>D\u00e9couverte de cancer<\/i>.<\/p>\n<p>Les chercheurs ont commenc\u00e9 par donner un produit chimique dans les cigarettes et autres toxines environnementales \u00e0 des souris qui avaient des tumeurs pancr\u00e9atiques. Ils cherchaient \u00e0 voir comment cela aurait un impact sur l&rsquo;interleukin-22, ou IL-22.<\/p>\n<p>Des travaux ant\u00e9rieurs ont montr\u00e9 que l&rsquo;IL-22 joue un r\u00f4le dans le microenvironnement tumoral pancr\u00e9atique. Un r\u00e9cepteur sp\u00e9cialis\u00e9 trouv\u00e9 sur les cellules productrices de l&rsquo;IL-22 se lie aux produits chimiques, et non aux prot\u00e9ines naturelles, dans le corps, il s&rsquo;agissait donc d&rsquo;une premi\u00e8re \u00e9tape logique pour voir comment le canc\u00e9rog\u00e8ne chimique aurait un impact sur l&rsquo;IL-22.<\/p>\n<p>\u00ab\u00a0Cela a radicalement chang\u00e9 la fa\u00e7on dont les tumeurs se comportent. Ils sont devenus beaucoup plus grands, ils se m\u00e9tastasent dans tout le corps. C&rsquo;\u00e9tait vraiment assez dramatique\u00a0\u00bb, a d\u00e9clar\u00e9 Timothy L. Frankel, codirecteur de l&rsquo;\u00e9tude principale, codirecteur du Rogel et du Blondy Center for Pancreatic Cancer et Maud T. Lane professeur d&rsquo;oncologie chirurgicale \u00e0 Michigan Medicine.<\/p>\n<p>Ensuite, ils ont commenc\u00e9 \u00e0 creuser dans quel m\u00e9canisme conduisait \u00e0 cette croissance tumorale am\u00e9lior\u00e9e. Ils ont confirm\u00e9 que chez la souris sans syst\u00e8me immunitaire, les toxines chimiques ne provoquaient pas la croissance tumorale, ce qui sugg\u00e8re que le canc\u00e9rog\u00e8ne fonctionnait dans le syst\u00e8me immunitaire.<\/p>\n<p>De l\u00e0, ils ont d\u00e9couvert un r\u00f4le pour l&rsquo;IL-22 dans la production de cellules immunitaires en T r\u00e9gulatrices, un type de cellule qui a \u00e9t\u00e9 pr\u00e9c\u00e9demment impliqu\u00e9 dans les troubles auto-immunes mais pas dans le cancer du pancr\u00e9as.<\/p>\n<p>\u00ab\u00a0Ces cellules T-R\u00e9gulatrices ont la capacit\u00e9 de fabriquer \u00e0 la fois l&rsquo;IL-22 mais aussi supprimer massivement toute immunit\u00e9 anti-tumorale. C&rsquo;est une attaque \u00e0 deux volets. Lorsque nous avons \u00e9limin\u00e9 toutes les cellules Treg de ces souris, nous avons invers\u00e9 toute la capacit\u00e9 du produit chimique de la cigarette \u00e0 laisser grandir le tumoraire\u00a0\u00bb, a d\u00e9clar\u00e9 Frankel.<\/p>\n<p>Ils ont confirm\u00e9 leurs r\u00e9sultats dans les cellules immunitaires humaines et \u00e9galement dans les cellules de patients atteints d&rsquo;un cancer du pancr\u00e9as. Effectivement, les fumeurs atteints de cancer du pancr\u00e9as avaient plus de cellules Treg que les non-fumeurs.<\/p>\n<p>Les chercheurs ont en outre pu montrer qu&rsquo;un inhibiteur qui bloque le produit chimique des cigarettes \u00e9tait efficace pour r\u00e9duire les tumeurs.<\/p>\n<p>\u00ab\u00a0Si nous sommes en mesure d&rsquo;inhiber les cellules super-suppressives, nous pourrions \u00e9galement d\u00e9bloquer l&rsquo;immunit\u00e9 anti-tumorale naturelle.<\/p>\n<p>Des recherches suppl\u00e9mentaires sont n\u00e9cessaires pour comprendre le potentiel d&rsquo;utiliser un m\u00e9dicament qui inhibe cette toxine environnementale ou qui bloque cette voie de signalisation. De plus, les r\u00e9sultats de l&rsquo;\u00e9tude sugg\u00e8rent la n\u00e9cessit\u00e9 d&rsquo;un traitement personnalis\u00e9 en fonction de l&rsquo;exposition des patients \u00e0 la fum\u00e9e de cigarette.<\/p>\n<p>\u00ab\u00a0Il y a un potentiel dont nous avons besoin pour traiter les fumeurs qui d\u00e9veloppent un cancer du pancr\u00e9as diff\u00e9remment\u00a0\u00bb, a d\u00e9clar\u00e9 Frankel. \u00ab\u00a0Nous pouvons \u00e9galement devoir d\u00e9pister les fumeurs de plus pr\u00e8s pour le d\u00e9veloppement du cancer du pancr\u00e9as. Il n&rsquo;y a pas un grand m\u00e9canisme de d\u00e9pistage, mais les personnes qui fument devraient \u00eatre \u00e9duqu\u00e9es sur les sympt\u00f4mes pour rechercher et envisager des r\u00e9f\u00e9rences \u00e0 une clinique \u00e0 haut risque.\u00a0\u00bb<\/p>\n<p>Les signes de cancer du pancr\u00e9as comprennent des lombalgies, un jaunissement de la peau et une perte de poids inexpliqu\u00e9e.<\/p>\n<p>Frankel ajoute que les personnes ayant des ant\u00e9c\u00e9dents familiaux de cancer du pancr\u00e9as ou avec d&rsquo;autres maladies inflammatoires pancr\u00e9atiques devraient \u00e9viter de fumer.<\/p>\n<p>                                        <!-- print only --><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Une nouvelle \u00e9tude explique pourquoi les fumeurs ont plus de chances de d\u00e9velopper un cancer<\/p>\n","protected":false},"author":1,"featured_media":9132,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[391,182,1220,1346,210,387,54],"class_list":["post-9131","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-addictions","tag-cancer","tag-comment","tag-entraine","tag-letude","tag-montre","tag-pancreas","tag-tabagisme","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.4 - 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