{"id":8092,"date":"2025-07-21T22:55:46","date_gmt":"2025-07-21T20:55:46","guid":{"rendered":"https:\/\/rvh-synergie.org\/actualites\/le-foie-entraine-la-cachexie-du-cancer-par-une-reponse-systemique-de-signalisation-decouvre-letude\/"},"modified":"2025-07-21T22:55:49","modified_gmt":"2025-07-21T20:55:49","slug":"le-foie-entraine-la-cachexie-du-cancer-par-une-reponse-systemique-de-signalisation-decouvre-letude","status":"publish","type":"post","link":"https:\/\/rvh-synergie.org\/actualites\/le-foie-entraine-la-cachexie-du-cancer-par-une-reponse-systemique-de-signalisation-decouvre-letude\/","title":{"rendered":"Le foie entra\u00eene la cachexie du cancer par une r\u00e9ponse syst\u00e9mique de signalisation, d\u00e9couvre l&rsquo;\u00e9tude"},"content":{"rendered":"<div>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2025\/liver-identified-as-dr.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/2025\/liver-identified-as-dr.jpg\" data-sub-html=\"Graphical abstract. Credit: &lt;i&gt;Cell&lt;\/i&gt; (2025). DOI: 10.1016\/j.cell.2025.06.039\">\n<figure class=\"article-img\">\n<\/figure><\/div>\n<\/div>\n<p>De nombreuses personnes atteintes de cancer subissent une perte spectaculaire de tissu musculaire et de graisse. Dans de nombreux cas, m\u00eame le muscle cardiaque est affect\u00e9, ce qui affaiblit encore le corps. Ce syndrome de gaspillage, connu sous le nom de cachexie, affecte environ la moiti\u00e9 de tous les patients canc\u00e9reux. Il s&rsquo;agit d&rsquo;une cause majeure de r\u00e9sistance au th\u00e9rapie, de complications et de mortalit\u00e9 accrue.<\/p>\n<p>Des chercheurs de Helmholtz Munich, en collaboration avec l&rsquo;h\u00f4pital universitaire de Heidelberg, de l&rsquo;Universit\u00e9 technique de Munich et du Centre allemand de la recherche sur le diab\u00e8te ont maintenant identifi\u00e9 un moteur de cachexie auparavant n\u00e9glig\u00e9: le foie. Il r\u00e9pond syst\u00e9matiquement aux tumeurs dans d&rsquo;autres organes &#8211; comme l&rsquo;intestin ou le pancr\u00e9as &#8211; et contribue \u00e0 la gaspillage tissulaire en lib\u00e9rant des mol\u00e9cules de signalisation sp\u00e9cifiques.<\/p>\n<p>L&rsquo;\u00e9tude est publi\u00e9e dans la revue <i>Cellule<\/i>.<\/p>\n<h2>Le g\u00e8ne de l&rsquo;horloge silencieux<\/h2>\n<p>Dans la cachexie, le m\u00e9tabolisme du foie est fondamentalement reprogramm\u00e9. Un g\u00e8ne, qui r\u00e9gule normalement l&rsquo;activit\u00e9 du foie tout au long de la journ\u00e9e, cesse de fonctionner correctement. \u00c0 l&rsquo;aide d&rsquo;un mod\u00e8le de souris, les chercheurs ont d\u00e9couvert que cette \u00ab\u00a0horloge interne\u00a0\u00bb \u00e9tait presque compl\u00e8tement ferm\u00e9e.<\/p>\n<p>\u00ab\u00a0Apr\u00e8s avoir r\u00e9activ\u00e9 le g\u00e8ne, connu sous le nom de Rev-Erb\u03b1, en particulier dans le foie des souris affect\u00e9es, la perte de masse corporelle a \u00e9t\u00e9 consid\u00e9rablement r\u00e9duite\u00a0\u00bb, explique le Dr Doris Kaltenecker, co-prime auteur de l&rsquo;\u00e9tude aux c\u00f4t\u00e9s du Dr S\u00f8ren Fisker Schmidt, et chercheur \u00e0 l&rsquo;Institut pour le diab\u00e8te et le cancer de Helmholtz Munich.<\/p>\n<h2>Les mol\u00e9cules de signalisation d\u00e9riv\u00e9es du foie conduisent la cachexie<\/h2>\n<p>L&rsquo;\u00e9quipe a montr\u00e9 que Rev-ERB\u03b1 r\u00e9gule plusieurs g\u00e8nes impliqu\u00e9s dans la production de mol\u00e9cules de signalisation d\u00e9riv\u00e9es du foie. Lorsque ce g\u00e8ne d&rsquo;horloge est inactif, le foie lib\u00e8re des niveaux de facteurs accrus qui favorisent la progression de la maladie.<\/p>\n<p>Trois de ces soi-disant h\u00e9patokines (LBP, ITIH3 et IGFBP1) sont au c\u0153ur du m\u00e9canisme nouvellement d\u00e9couvert. Dans les exp\u00e9riences de culture cellulaire, ils ont d\u00e9clench\u00e9 des processus cataboliques (d\u00e9grad\u00e9s tissulaires) dans les cellules musculaires et graisseuses, qui sont pr\u00e9cis\u00e9ment les processus responsables de la gaspillage physique observ\u00e9e dans la cachexie.<\/p>\n<p>De plus, les niveaux de ces prot\u00e9ines \u00e9taient nettement \u00e9lev\u00e9s dans le sang des patients cachectiques atteints de divers types de cancer. Dans les mod\u00e8les pr\u00e9cliniques, l&rsquo;inhibition cibl\u00e9e de ces facteurs a r\u00e9ussi \u00e0 att\u00e9nuer leurs effets nocifs.<\/p>\n<h2>Perspectives de diagnostic et de th\u00e9rapie<\/h2>\n<p>\u00ab\u00a0Pour la premi\u00e8re fois, nous avons pu montrer que le foie n&rsquo;est pas seulement un r\u00e9pondeur passif de la cachexie, mais contribue activement \u00e0 la progression de la maladie\u00a0\u00bb, explique le Dr Mauricio Berriel Diaz, qui a men\u00e9 l&rsquo;\u00e9tude \u00e0 Helmholtz Munich. \u00ab\u00a0Nos r\u00e9sultats ouvrent de nouvelles possibilit\u00e9s pour mieux diagnostiquer le syndrome et explorer les interventions th\u00e9rapeutiques.\u00a0\u00bb<\/p>\n<p>L&rsquo;\u00e9tude fournit \u00e9galement une ressource de donn\u00e9es compl\u00e8te sur le r\u00f4le du foie dans la cachexie, allant des r\u00e9seaux mol\u00e9culaires aux changements sp\u00e9cifiques au type cellulaire et aux r\u00e9sultats fonctionnels dans les mod\u00e8les pr\u00e9cliniques. Cet ensemble de donn\u00e9es est d\u00e9sormais accessible \u00e0 la communaut\u00e9 scientifique et peut \u00eatre utilis\u00e9 bien au-del\u00e0 du syst\u00e8me mod\u00e8le \u00e9tudi\u00e9.<\/p>\n<p>\u00c0 long terme, les facteurs identifi\u00e9s pourraient servir de biomarqueurs au risque de cachexie ou comme des cibles pour de nouvelles th\u00e9rapies.<\/p>\n<p>\u00ab\u00a0\u00c9tant donn\u00e9 qu&rsquo;il n&rsquo;y a actuellement aucun traitement approuv\u00e9 pour la cachexie, nous avons besoin de nouvelles approches de toute urgence\u00a0\u00bb, souligne le professeur Stephan Herzig, directeur du Helmholtz Diabetes Center et de l&rsquo;Institut du diab\u00e8te et du cancer \u00e0 Helmholtz Munich et professeur \u00e0 l&rsquo;Universit\u00e9 technique de Munich.<\/p>\n<p>\u00ab\u00a0Ces r\u00e9sultats d\u00e9montrent clairement l&rsquo;importance des interactions syst\u00e9miques des organes dans la progression du cancer.\u00a0\u00bb<\/p>\n<p>                                        <!-- print only --><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>De nombreuses personnes atteintes de cancer subissent une perte spectaculaire de tissu musculaire et de<\/p>\n","protected":false},"author":1,"featured_media":8093,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[6061,391,672,1220,191,1346,540,326,844,1646,47],"class_list":["post-8092","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-maladies","tag-cachexie","tag-cancer","tag-decouvre","tag-entraine","tag-foie","tag-letude","tag-par","tag-reponse","tag-signalisation","tag-systemique","tag-une","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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