Drug repurposing screens reveal cell-type-specific entry pathways and FDA-approved drugs active against SARS-Cov-2

Cell Rep. 2021 Apr 6;35(1):108959. doi: 10.1016/j.celrep.2021.108959. Epub 2021 Mar 23.

Abstract

There is an urgent need for antivirals to treat the newly emerged severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). To identify new candidates, we screen a repurposing library of ∼3,000 drugs. Screening in Vero cells finds few antivirals, while screening in human Huh7.5 cells validates 23 diverse antiviral drugs. Extending our studies to lung epithelial cells, we find that there are major differences in drug sensitivity and entry pathways used by SARS-CoV-2 in these cells. Entry in lung epithelial Calu-3 cells is pH independent and requires TMPRSS2, while entry in Vero and Huh7.5 cells requires low pH and triggering by acid-dependent endosomal proteases. Moreover, we find nine drugs are antiviral in respiratory cells, seven of which have been used in humans, and three are US Food and Drug Administration (FDA) approved, including cyclosporine. We find that the antiviral activity of cyclosporine is targeting Cyclophilin rather than calcineurin, revealing essential host targets that have the potential for rapid clinical implementation.

Keywords: HTS; SARS2; TMPRSS2; antiviral; coronavirus; cyclophilin; cyclosporin; drugs; entry; screening.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • COVID-19 / metabolism
  • COVID-19 / pathology
  • COVID-19 Drug Treatment*
  • Chlorocebus aethiops
  • Cyclosporine / pharmacology*
  • Drug Repositioning*
  • Epithelial Cells / metabolism*
  • Epithelial Cells / pathology
  • Epithelial Cells / virology
  • Humans
  • Lung / metabolism*
  • Lung / pathology
  • Lung / virology
  • SARS-CoV-2 / metabolism*
  • Serine Endopeptidases / metabolism
  • United States
  • United States Food and Drug Administration
  • Vero Cells

Substances

  • Cyclosporine
  • Serine Endopeptidases
  • TMPRSS2 protein, human