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<dc:title xml:lang="fr">Impact du collagène de type VI sécrétés par les hépatocytes infectés par le virus de l’hépatite B sur l’activation des myofibroblastes hépatiques</dc:title>
<dcterms:alternative xml:lang="en">Impact of type VI collagen secreted by hepatocytes infected with hepatitis B virus on the activation of hepatic myofibroblasts</dcterms:alternative>
<dc:subject xml:lang="fr">Virus de l’hépatite B</dc:subject>
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<dcterms:abstract xml:lang="fr">L’hépatite B chronique est une cause majeure de la progression des maladies hépatiques, de la fibrose au carcinome hépatocellulaire (CHC), mais les mécanismes moléculaires sous-jacents restent mal compris. Ce projet de thèse a mis en évidence, via une analyse protéomique de cellules infectées par le VHB, une dérégulation des processus impliqués dans le remodelage de la matrice extracellulaire, notamment une surexpression du collagène de type VI (ColVI). Au cours de cette étude, un lien fonctionnel a été établi entre l’activation de la voie PI3K/Akt et l’induction du ColVI par le VHB. Le ColVI ainsi induit est ensuite sécrété par les hépatocytes infectés et possède la capacité d’activer les cellules stellaires hépatiques. Ces résultats révèlent un rôle inédit du ColVI dans la fibrogenèse associée au VHB et ouvrent la voie à l’identification de nouvelles cibles thérapeutiques pour limiter la progression vers la cirrhose et le CHC.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Chronic hepatitis B is a major driver of liver disease progression, from fibrosis to hepatocellular carcinoma (HCC), yet the underlying molecular mechanisms remain poorly understood. This thesis project revealed, through a proteomic analysis of HBV-infected cells, a dysregulation of processes involved in extracellular matrix remodeling, notably an overexpression of type VI collagen (ColVI). During this study, a functional link was established between the activation of the PI3K/Akt pathway and the HBV-mediated induction of ColVI. The induced ColVI is subsequently secreted by infected hepatocytes and has the capacity to activate hepatic stellate cells. These findings highlight a previously unrecognized role of ColVI in HBV-associated fibrogenesis and pave the way for identifying new therapeutic targets to prevent progression to cirrhosis and HCC.</dcterms:abstract>
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