Oncolytic H-1 parvovirus enters cancer cells through clathrin-mediated endocytosis

Tiago Ferreira, Amit Kulkarni, Clemens Bretscher, Karsten Richter, Marcelo Ehrlich, Antonio Marchini*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

H-1 protoparvovirus (H-1PV) is a self-propagating virus that is non-pathogenic in humans and has oncolytic and oncosuppressive activities. H-1PV is the first member of the Parvoviridae family to undergo clinical testing as an anticancer agent. Results from clinical trials in patients with glioblastoma or pancreatic carcinoma show that virus treatment is safe, well-tolerated and associated with first signs of efficacy. Characterisation of the H-1PV life cycle may help to improve its efficacy and clinical outcome. In this study, we investigated the entry route of H-1PV in cervical carcinoma HeLa and glioma NCH125 cell lines. Using electron and confocal microscopy, we detected H-1PV particles within clathrin-coated pits and vesicles, providing evidence that the virus uses clathrin-mediated endocytosis for cell entry. In agreement with these results, we found that blocking clathrin-mediated endocytosis using specific inhibitors or small interfering RNA-mediated knockdown of its key regulator, AP2M1, markedly reduced H-1PV entry. By contrast, we found no evidence of viral entry through caveolae-mediated endocytosis. We also show that H-1PV entry is dependent on dynamin, while viral trafficking occurs from early to late endosomes, with acidic pH necessary for a productive infection. This is the first study that characterises the cell entry pathways of oncolytic H-1PV.

Original languageEnglish
Article number1199
JournalViruses
Volume12
Issue number10
DOIs
StatePublished - 21 Oct 2020

Keywords

  • Clathrin-mediated endocytosis
  • Oncolytic viruses
  • Rodent protoparvovirus H-1PV
  • Virus entry

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