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<dc:title xml:lang="fr">Identification des circuits biologiques induits par le virus de l'hépatite C et leurs implications dans le développement du carcinome hepatocellulaire</dc:title>
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<dc:subject xml:lang="fr">Virus de l’hépatite C</dc:subject>
<dc:subject xml:lang="fr">Carcinome hépatocellulaire</dc:subject>
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<dc:subject xml:lang="fr">Phosphatase</dc:subject>
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<dc:subject xml:lang="en">Hepatitis C virus</dc:subject>
<dc:subject xml:lang="en">Hepatocellular carcinoma</dc:subject>
<dc:subject xml:lang="en">Liver disease</dc:subject>
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<dcterms:abstract xml:lang="fr">En combinant un nouveau système de culture cellulaire à partir d'hépatocytes différenciés avec du virus de l’hépatite C (VHC) purifié, nous pouvons induire un profil transcriptomique caractéristique des patients à risque élevé de développer un carcinome hépatocellulaire (CHC). En utilisant ce modèle, nous avons découvert le rôle fonctionnel de l'EGFR comme élément moteur de la signature du risque de développement d'un CHC. De plus, nous avons identifié des gènes candidats impliqués dans le développement du CHC. Pour étudier les maladies du foie in vivo, nous avons caractérisé l'expression des protéines phosphatases dans des biopsies hépatiques de patients infectés par le VHC. Nous avons observé une régulation négative de PTPRD, un suppresseur de tumeur, causé par une augmentation de miR-135a-5p qui cible l'ARNm de PTPRD. Par ailleurs, l'analyse in silico montre que l'expression de PTPRD dans le tissu hépatique est corrélée à la survie chez les patients atteints de CHC.</dcterms:abstract>
<dcterms:abstract xml:lang="en">By combining a cell culture system of hepatocyte-like cells with purified hepatitis C virus (HCV), we effectively simulated chronic infection in vitro. We found this infection model induces a transcriptomic profile of chronic HCV patients at high risk of developing hepatocellular carcinoma (HCC). Using this model, we have uncovered the functional role of EGFR as a driver of the HCC risk signature and revealed candidate drivers of the molecular recalibration of hepatocytes leading to liver cancer. In an approach to study liver disease in vivo, we opted to screen for protein phosphatase expression in liver biopsies of chronic HCV patients. We observed a downregulation of PTPRD, a well-known tumor suppressor. We demonstrated that this effect is mediated by an increase in miR-135a-5p which targets PTPRD mRNA. Moreover, in silico analysis shows that PTPRD expression in adjacent liver tissue of HCC patients correlates with survival and reduced tumor recurrence after surgical resection.</dcterms:abstract>
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