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PI3K/SHIP2/PTEN pathway in cell polarity and hepatitis C virus pathogenesis

World Journal of Hepatology 2017年第1期9卷 18-29页

作者： aline awad Ama Gassama-Diagne Inserm Unite 1193 Hopital Paul Brousse Univ Paris-Sud UMR-S 1193Univsite Paris-Saclay

Hepatitis C virus(HCV) infects hepatocytes, polarized cells in the liver. Chronic HCV infection often leads to steatosis, fibrosis, cirrhosis and hepatocellular carcinoma, and it has been identified as the leading cause of liver transplantation worldwide. The HCV replication cycle is dependent on lipid metabolism and particularly an accumulation of lipid droplets in host cells. Phosphoinositides(PIs) are minor phospholipids enriched in different membranes and their levels are tightly regulated by specific PI kinases and phosphatases. PIs are implicated in a vast array of cellular responses that are central to morphogenesis, such as cytoskeletal changes, cytokinesis and the recruitment of downstream effectors to govern mechanisms involved in polarization and lumen formation. Important reviews of the literature identified phosphatidylinositol(Ptd Ins) 4-kinases, and their lipid products Ptd Ins(4)P, as critical regulators of the HCV life cycle. SH2-containing inositol polyphosphate 5-phosphatase(SHIP2), phosphoinositide 3-kinase(PI3K) and their lipid products Ptd Ins(3,4)P2 and Ptd Ins(3,4,5)P3, respectively, play an important role in the cell membrane and are key to the establishment of apicobasal polarity and lumen formation. In this review, we will focus on these new functions of PI3 K and SHIP2, and their deregulation by HCV, causing a disruption of apicobasal polarity, actin organization and extracellular matrix assembly. Finally we will highlight the involvement of this pathway in the event of insulin resistance and nonalcoholic fatty liver disease related to HCV infection.

关键词： Hepatitis C virus Phosphoinositide 3-kinase SH2-containing inositol polyphosphate 5-phosphatase Epithelial cell polarity Phosphoinositides

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