Macropinocytosis and Clathrin-Dependent Endocytosis Play Pivotal Roles for the Infectious Entry of Puumala Virus
- 1 July 2020
- journal article
- research article
- Published by American Society for Microbiology in Journal of Virology
- Vol. 94 (14)
- https://doi.org/10.1128/JVI.00184-20
Abstract
Viruses from the family Hantaviridae are encountered as emerging pathogens causing two life-threatening human zoonoses: hemorrhagic fever with renal syndrome (HFRS) and hantavirus cardiopulmonary syndrome (HCPS), with case fatality rates of up to 50%. Here, we comprehensively investigated entry of the Old World hantavirus Puumala virus (PUUV) into mammalian cells, showing that upon treatment with pharmacological inhibitors of macropinocytosis and clathrin-mediated endocytosis, PUUV infections are greatly reduced. We demonstrate that the inhibitors did not interfere with viral replication and that RNA interference, targeting cellular mediators of macropinocytosis, decreases PUUV infection levels significantly. Moreover, we established lipophilic tracer staining of PUUV particles and show colocalization of stained virions and markers of macropinosomes. Finally, we report a significant increase in the fluid-phase uptake of cells infected with PUUV, indicative of a virus-triggered promotion of macropinocytosis. IMPORTANCE The family Hantaviridae comprises a diverse group of virus species and is considered an emerging global public health threat. Individual hantavirus species differ considerably in terms of their pathogenicity but also in their cell biology and host-pathogen interactions. In this study, we focused on the most prevalent pathogenic hantavirus in Europe, Puumala virus (PUUV), and investigated the entry and internalization of PUUV into mammalian cells. We show that both clathrin-mediated endocytosis and macropinocytosis are cellular pathways exploited by the virus to establish productive infections and demonstrate that pharmacological inhibition of macropinocytosis or a targeted knockdown using RNA interference significantly reduced viral infections. We also found indications of an increase of macropinocytic uptake upon PUUV infection, suggesting that the virus triggers specific cellular mechanisms in order to stimulate its own internalization, thus facilitating infection.Funding Information
- Infect-ERA (031L0096A)
- Infect-ERA (031L0096B)
This publication has 49 references indexed in Scilit:
- Filamentous Influenza Virus Enters Cells via MacropinocytosisJournal of Virology, 2012
- Ebola Virus Enters Host Cells by Macropinocytosis and Clathrin-Mediated EndocytosisThe Journal of Infectious Diseases, 2011
- Integrins traffic rapidly via circular dorsal ruffles and macropinocytosis during stimulated cell migrationThe Journal of cell biology, 2011
- Entry of Bunyaviruses into Mammalian CellsCell Host & Microbe, 2010
- Defining MacropinocytosisTraffic, 2009
- Published by Wiley ,2008
- Dynein-Dependent Transport of the Hantaan Virus Nucleocapsid Protein to the Endoplasmic Reticulum-Golgi Intermediate CompartmentJournal of Virology, 2007
- Selective inhibition by rottlerin of macropinocytosis in monocyte‐derived dendritic cellsImmunology, 2005
- Cholesterol and caveolae: structural and functional relationshipsBiochimica et Biophysica Acta (BBA) - Molecular and Cell Biology of Lipids, 2000
- Mis-assembly of clathrin lattices on endosomes reveals a regulatory switch for coated pit formation.The Journal of cell biology, 1993