Hepatitis B Virus Targets Lipid Transport Pathways to Infect Hepatocytes

Knud Esser, Xiaoming Cheng, Jochen M. Wettengel, Julie Lucifora, Lea Hansen-Palmus, Katharina Austen, Armando A. Roca Suarez, Sarah Heintz, Barbara Testoni, Firat Nebioglu, Minh Tu Pham, Shangqing Yang, Alma Zernecke, Dirk Wohlleber, Marc Ringelhan, Mathias Broxtermann, Daniel Hartmann, Norbert Hüser, Julia Mergner, Andreas PichlmairWolfgang E. Thasler, Mathias Heikenwalder, Georg Gasteiger, Andreas Blutke, Axel Walch, Percy A. Knolle, Ralf Bartenschlager, Ulrike Protzer

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Background & Aims: A single hepatitis B virus (HBV) particle is sufficient to establish chronic infection of the liver after intravenous injection, suggesting that the virus targets hepatocytes via a highly efficient transport pathway. We therefore investigated whether HBV uses a physiological liver-directed pathway that supports specific host-cell targeting in vivo. Methods: We established the ex vivo perfusion of intact human liver tissue that recapitulates the liver physiology to investigate HBV liver targeting. This model allowed us to investigate virus-host cell interactions in a cellular microenvironment mimicking the in vivo situation. Results: HBV was rapidly sequestered by liver macrophages within 1 hour after a virus pulse perfusion but was detected in hepatocytes only after 16 hours. We found that HBV associates with lipoproteins in serum and within machrophages. Electron and immunofluorescence microscopy corroborated a co-localization in recycling endosomes within peripheral and liver macrophages. Recycling endosomes accumulated HBV and cholesterol, followed by transport of HBV back to the cell surface along the cholesterol efflux pathway. To reach hepatocytes as final target cells, HBV was able to utilize the hepatocyte-directed cholesterol transport machinery of macrophages. Conclusions: Our results propose that by binding to liver targeted lipoproteins and using the reverse cholesterol transport pathway of macrophages, HBV hijacks the physiological lipid transport pathways to the liver to most efficiently reach its target organ. This may involve transinfection of liver macrophages and result in deposition of HBV in the perisinusoidal space from where HBV can bind its receptor on hepatocytes.

Original languageEnglish
Pages (from-to)201-221
Number of pages21
JournalCMGH
Volume16
Issue number2
DOIs
StatePublished - Jan 2023

Keywords

  • Lipoprotein Metabolism
  • Liver Targeting
  • Transcytosis
  • Transinfection

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