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Lysophosphatidylcholine acyltransferase 1 is downregulated by hepatitis C virus: impact on production of lipo-viro-particles
  1. Frauke Beilstein1,2,
  2. Matthieu Lemasson3,
  3. Véronique Pène3,
  4. Dominique Rainteau4,
  5. Sylvie Demignot1,2,
  6. Arielle R Rosenberg3,5
  1. 1Sorbonne Universités, UPMC Univ. Paris 06, Inserm, Université Paris Descartes, Sorbonne Paris Cité, UMR_S 1138, Centre de Recherche des Cordeliers, Paris, France
  2. 2EPHE, Ecole Pratique des Hautes Etudes, PSL Research University, Laboratoire de Pharmacologie Cellulaire et Moléculaire, Paris, France
  3. 3Université Paris Descartes, EA 4474 «Hepatitis C Virology», Paris, France
  4. 4UPMC Univ. Paris 06, ERL INSERM U 1057/UMR 7203, Paris, France
  5. 5AP-HP, Groupe Hospitalier Cochin, Service de Virologie, Paris, France
  1. Correspondence to Dr Sylvie Demignot, Centre de Recherche des Cordeliers, 15 rue de l'Ecole de Médecine, 75006 Paris, France; sylvie.demignot{at}crc.jussieu.fr; Dr Arielle R Rosenberg, EA 4474 “Hepatitis C Virology”, 22 rue Méchain, 75014 Paris, France; arielle.rosenberg{at}parisdescartes.fr

Abstract

Objective HCV is intimately linked with the liver lipid metabolism, devoted to the efflux of triacylglycerols stored in lipid droplets (LDs) in the form of triacylglycerol-rich very-low-density lipoproteins (VLDLs): (i) the most infectious HCV particles are those of lowest density due to association with triacylglycerol-rich lipoproteins and (ii) HCV-infected patients frequently develop hepatic steatosis (increased triacylglycerol storage). The recent identification of lysophosphatidylcholine acyltransferase 1 (LPCAT1) as an LD phospholipid-remodelling enzyme prompted us to investigate its role in liver lipid metabolism and HCV infectious cycle.

Design Huh-7.5.1 cells and primary human hepatocytes (PHHs) were infected with JFH1-HCV. LPCAT1 depletion was achieved by RNA interference. Cells were monitored for LPCAT1 expression, lipid metabolism and HCV production and infectivity. The density of viral particles was assessed by isopycnic ultracentrifugation.

Results Upon HCV infection, both Huh-7.5.1 cells and PHH had decreased levels of LPCAT1 transcript and protein, consistent with transcriptional downregulation. LPCAT1 depletion in either naive or infected Huh-7.5.1 cells resulted in altered lipid metabolism characterised by LD remodelling, increased triacylglycerol storage and increased secretion of VLDL. In infected Huh-7.5.1 cells or PHH, LPCAT1 depletion increased production of the viral particles of lowest density and highest infectivity.

Conclusions We have identified LPCAT1 as a modulator of liver lipid metabolism downregulated by HCV, which appears as a viral strategy to increase the triacylglycerol content and hence infectivity of viral particles. Targeting this metabolic pathway may represent an attractive therapeutic approach to reduce both the viral titre and hepatic steatosis.

  • HEPATITIS C

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