{
  "abstract": "Background Hepatitis E virus (HEV) is a leading cause of viral hepatitis, yet treatment remains limited to the off-label use of ribavirin, which can have significant side effects and is not suitable for all patients, highlighting the need for new antiviral strategies. HEV infection depends on endolysosomal trafficking of virions to lysosomal compartments to initiate host cell entry. To deepen our understanding of the HEV infection cycle and support the development of novel antiviral strategies, we assessed the antiviral efficacy of compounds targeting components of the endocytic machinery.Methods Using an established HEV cell culture model, we screened a panel of experimental and Food and Drug Administration-approved compounds targeting the endocytic pathway. Following the initial screen, the antiviral activity of apilimod was further characterised using infectivity assays, siRNA-mediated knockdown, time-of-addition experiments and mechanistic analyses of endolysosomal organisation and lysosomal protease activity. Efficacy was additionally evaluated in primary human hepatocytes and in a ratHEV infection model in vivo.Results Five compounds (apilimod, raloxifen, verapamil, chloroquine and tamoxifen) inhibited HEV infection in a dose-dependent manner. The FYVE-type zinc finger containing phosphoinositide kinase (PIKfyve) inhibitor apilimod exhibited the highest antiviral potency. Requirement of PIKfyve for HEV infection was confirmed by siRNA knockdown, and time-of-addition assays demonstrated that apilimod acts during viral entry without affecting replication. Mechanistically, PIKfyve inhibition disrupted lysosomal organisation, impaired HEV trafficking to late endosomal/lysosomal compartments and reduced lysosomal cathepsin activity. Apilimod significantly reduced HEV infectivity in primary human hepatocytes and decreased viral RNA levels in faeces and tissues in a ratHEV infection model.Conclusion Overall, our data suggest that the endolysosomal protein PIKfyve plays a crucial role during the entry of HEV. Considering the reported safety profile of apilimod in previous human clinical trials, the pharmacological targeting of PIKfyve kinase activity might guide novel antiviral strategies against HEV.",
  "authors": [
    {
      "affiliations": [
        "Department of Molecular and Medical Virology, Faculty of Medicine, Ruhr University Bochum, Bochum, Germany",
        "Hepatitis E Virus Research Hub (HepE-Hub), Bochum, Germany"
      ],
      "name": "Julian J Ring"
    },
    {
      "affiliations": [
        "Department of Molecular and Medical Virology, Faculty of Medicine, Ruhr University Bochum, Bochum, Germany",
        "Hepatitis E Virus Research Hub (HepE-Hub), Bochum, Germany"
      ],
      "name": "Sarah Schlienkamp"
    },
    {
      "affiliations": [
        "Department of Molecular and Medical Virology, Faculty of Medicine, Ruhr University Bochum, Bochum, Germany",
        "Hepatitis E Virus Research Hub (HepE-Hub), Bochum, Germany"
      ],
      "name": "Maria L Goussain Darido"
    },
    {
      "affiliations": [
        "Virology, Antiviral Drug & Vaccine Research Group, Department of Microbiology, Immunology and Transplantation, Rega Institute for Medical Research, KU Leuven, Leuven, Belgium"
      ],
      "name": "Xin Zhang"
    },
    {
      "affiliations": [
        "Institute for Medical Microbiology and Virology, Carl von Ossietzky University Oldenburg, Oldenburg, Germany"
      ],
      "name": "Olinda Pinto Veiga"
    },
    {
      "affiliations": [
        "Department of Molecular and Medical Virology, Faculty of Medicine, Ruhr University Bochum, Bochum, Germany",
        "Hepatitis E Virus Research Hub (HepE-Hub), Bochum, Germany"
      ],
      "name": "Jil Alexandra Haase"
    },
    {
      "affiliations": [
        "Department of Molecular and Medical Virology, Faculty of Medicine, Ruhr University Bochum, Bochum, Germany",
        "Hepatitis E Virus Research Hub (HepE-Hub), Bochum, Germany"
      ],
      "name": "Emely Richter"
    },
    {
      "affiliations": [
        "Department of Molecular and Medical Virology, Faculty of Medicine, Ruhr University Bochum, Bochum, Germany",
        "Hepatitis E Virus Research Hub (HepE-Hub), Bochum, Germany"
      ],
      "name": "André Gömer"
    },
    {
      "affiliations": [
        "Schaller Research Group, Department of Infectious Diseases and Virology, Heidelberg University Hospital, Heidelberg, Germany",
        "Heidelberg Biosciences International Graduate School, Heidelberg University, Heidelberg, Germany"
      ],
      "name": "Rebecca Menhua Fu"
    },
    {
      "affiliations": [
        "Schaller Research Group, Department of Infectious Diseases and Virology, Heidelberg University Hospital, Heidelberg, Germany",
        "German Center for Infection Research (DZIF), Partner Site Heidelberg, Heidelberg, Germany"
      ],
      "name": "Viet Loan Dao Thi"
    },
    {
      "affiliations": [
        "Institute of Novel and Emerging Infectious Diseases, Friedrich-Loeffler-Institute, Greifswald-Insel Riems, Germany",
        "German Center for Infection Research (DZIF), Partner Site Hamburg-Lübeck-Borstel, Greifswald-Insel Riems, Germany"
      ],
      "name": "Rainer G Ulrich"
    },
    {
      "affiliations": [
        "Department of Molecular and Medical Virology, Faculty of Medicine, Ruhr University Bochum, Bochum, Germany",
        "Hepatitis E Virus Research Hub (HepE-Hub), Bochum, Germany"
      ],
      "name": "Mara Klöhn"
    },
    {
      "affiliations": [
        "Department of Molecular and Medical Virology, Faculty of Medicine, Ruhr University Bochum, Bochum, Germany",
        "Hepatitis E Virus Research Hub (HepE-Hub), Bochum, Germany",
        "Department of Translational and Computational Infection Research, Ruhr University Bochum, Bochum, Germany",
        "European Virus Bioinformatics Centre (EVBC), Jena, Germany"
      ],
      "name": "Daniel Todt"
    },
    {
      "affiliations": [
        "Department of Molecular Cell Biology, Institute of Biochemistry and Pathobiochemistry, Ruhr University Bochum, Bochum, Germany"
      ],
      "name": "Verian Bader"
    },
    {
      "affiliations": [
        "Department of Molecular Cell Biology, Institute of Biochemistry and Pathobiochemistry, Ruhr University Bochum, Bochum, Germany"
      ],
      "name": "Konstanze F Winklhofer"
    },
    {
      "affiliations": [
        "Institute for Medical Microbiology and Virology, Carl von Ossietzky University Oldenburg, Oldenburg, Germany"
      ],
      "name": "Volker Kinast"
    },
    {
      "affiliations": [
        "Virology, Antiviral Drug & Vaccine Research Group, Department of Microbiology, Immunology and Transplantation, Rega Institute for Medical Research, KU Leuven, Leuven, Belgium"
      ],
      "name": "Johan Neyts"
    },
    {
      "affiliations": [
        "Virology, Antiviral Drug & Vaccine Research Group, Department of Microbiology, Immunology and Transplantation, Rega Institute for Medical Research, KU Leuven, Leuven, Belgium"
      ],
      "name": "Suzanne J F Kaptein"
    },
    {
      "affiliations": [
        "Department of Molecular and Medical Virology, Faculty of Medicine, Ruhr University Bochum, Bochum, Germany",
        "Hepatitis E Virus Research Hub (HepE-Hub), Bochum, Germany",
        "German Center for Infection Research (DZIF), External Partner Site Bochum, Bochum, Germany"
      ],
      "name": "Eike Steinmann"
    },
    {
      "affiliations": [
        "Department of Molecular and Medical Virology, Faculty of Medicine, Ruhr University Bochum, Bochum, Germany",
        "Hepatitis E Virus Research Hub (HepE-Hub), Bochum, Germany"
      ],
      "name": "Yannick Brüggemann"
    }
  ],
  "title": "Phosphoinositide kinase PIKfyve inhibitor apilimod blocks hepatitis E virus infection",
  "uid": "1944cbba-f7a9-5597-91bd-fe6cc9bb53c8"
}