Maturation of secreted HCV particles by incorporation of secreted ApoE protects from antibodies by enhancing infectivity
Background & Aims: Hepatitis C virus (HCV) evades humoral immunity and establishes chronic infections. Virus particles circulate in complex with lipoproteins facilitating antibody escape. Apolipoprotein E (ApoE) is essential for intracellular HCV assembly and for HCV cell entry. We aimed to expl...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
22 April 2017
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| In: |
Journal of hepatology
Year: 2017, Volume: 67, Issue: 3, Pages: 480-489 |
| ISSN: | 1600-0641 |
| DOI: | 10.1016/j.jhep.2017.04.010 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1016/j.jhep.2017.04.010 Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0168827817302519 
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| Author Notes: | Dorothea Bankwitz, Mandy Doepke, Kathrin Hueging, Romy Weller, Janina Bruening, Patrick Behrendt, Ji-Young Lee, Florian W. R. Vondran, Michael P. Manns, Ralf Bartenschlager, Thomas Pietschmann |
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| 245 | 1 | 0 | |a Maturation of secreted HCV particles by incorporation of secreted ApoE protects from antibodies by enhancing infectivity |c Dorothea Bankwitz, Mandy Doepke, Kathrin Hueging, Romy Weller, Janina Bruening, Patrick Behrendt, Ji-Young Lee, Florian W. R. Vondran, Michael P. Manns, Ralf Bartenschlager, Thomas Pietschmann |
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| 520 | |a Background & Aims: Hepatitis C virus (HCV) evades humoral immunity and establishes chronic infections. Virus particles circulate in complex with lipoproteins facilitating antibody escape. Apolipoprotein E (ApoE) is essential for intracellular HCV assembly and for HCV cell entry. We aimed to explore if ApoE released from non-infected cells interacts with and modulates secreted HCV particles. Methods: ApoE secreted from non-infected cells was incubated with HCV from primary human hepatocytes or Huh-7.5 cells. Co-immunoprecipitation, viral infectivity and neutralization experiments were conducted. Results: Physiological levels of secreted ApoE (10-60µg/ml) enhanced the infectivity of HCV up to 8-fold across all genotypes, which indirectly decreased virus neutralization by antibodies targeting E1 or E2 up to 10-fold. Infection enhancement was observed for particles produced in primary human hepatocytes and Huh-7.5 cells. Selective depletion of ApoE ablated infection enhancement. Addition of HA-tagged ApoE to HCV particles permitted co-precipitation of HCV virions. Serum ApoE levels ranged between 10-60µg/ml, which is ca 100-fold higher than in Huh-7.5 conditioned cell culture fluids. Serum-derived HCV particles carried much higher amounts of ApoE than cell culture-derived HCV particles. Serum ApoE levels correlated with efficiency of co-precipitation of HCV upon exogenous addition of HA-ApoE. ApoE-dependent infection enhancement was independent of the hypervariable region 1 and SR-B1, but was dependent on heparan sulfate proteoglycans (HSPGs). Conclusions: Physiological quantities of secreted ApoE stimulate HCV infection and increase antibody escape, by incorporating into virus particles and enhancing particle interactions with cellular HSPGs. Thus, secreted particles undergo ApoE-dependent maturation to enhance infectivity and to facilitate evasion from neutralizing antibodies. Lay summary: This study shows that HCV particle infectivity is remodeled by secreted ApoE after particle release from cells. Fluctuation of the availability of ApoE likely influences HCV infectivity, antibody escape and transmission. | ||
| 650 | 4 | |a Antibody escape | |
| 650 | 4 | |a Apolipoprotein E | |
| 650 | 4 | |a Assembly | |
| 650 | 4 | |a Entry | |
| 650 | 4 | |a Hepatitis C virus | |
| 650 | 4 | |a Neutralizing antibody | |
| 700 | 1 | |a Lee, Ji Young |e VerfasserIn |0 (DE-588)1058274570 |0 (DE-627)79668037X |0 (DE-576)414323610 |4 aut | |
| 700 | 1 | |a Bartenschlager, Ralf |d 1958- |e VerfasserIn |0 (DE-588)1058097989 |0 (DE-627)796390509 |0 (DE-576)168706067 |4 aut | |
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