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this complex is termed lipoviroparticle (LVP).35 LVPs make HCV undetectable to antibodies and serum complement.36 Also, apolipoproteins of the LVP play a key role on virus attachment and entry into the hepatic cells, since they are ligands of the LDLR and other hepatic lipid-coreceptors.37,38 The intrahepatic HCV life cycle is highly dependant on hepatic cholesterol and lipogenesis pathways.39 During infection, HCV upregulates host lipid metabolism by a variety of molecular mechanisms which may eventually contribute to the development of hepatic steatosis that occurs in almost 55% of HCV-infected patients.6 In general, an intracellular environment rich in lipids including cholesterol is necessary for a successful HCV life cycle.3 As shown in figure 2, HCV uses LDLR and other lipid receptors expressed in hepatocytes surface (CD36, CD81, SR-B1, claudin-1) on entry.40,41 Once inside, HCV increases lipogenesis de novo and cholesterol biosynthesis via activation of the transcriptional factor sterol regulatory element-binding protein (SREBP) and reduces lipid export via the very-low density lipoproteins (VLDL).42,43 SREBP is an endoplasmic reticulum membrane-bound transcription factor that activates genes encoding enzymes of cholesterol and fatty acid biosynthesis.44,45 During its replication HCV induces the activity of stearoyl coenzyme A desaturase 1 (SCD1), an enzyme that catalyzes the synthesis of monounsaturated fatty acids such as oleic acid.46 SCD1 is required for formation and regulation of HCV replication complex as its inhibition blocks HCV replication.47 Like other positive-sense RNA viruses, HCV life cycle needs a membrane web folding in the cytoplasm.48 This membrane web formation is dependent on the regulation of the cholesterol and unsaturated fatty acids metabolism.49 Finally, HCV also reduces lipid export by interfering VLDL excretion.43 Thus, low levelsof total cholesterol, LDL, VLDL and lipoproteins are found in the serum of chronic HCV patients.50 Hepatocellular lipid storage (steatosis) appears to be a direct consequence of HCV genotype 3

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