A novel method for high-throughput screening to quantify antiviral activity against viruses that induce limited CPE

J Virol Methods. 2012 Aug;183(2):176-9. doi: 10.1016/j.jviromet.2012.04.011. Epub 2012 Apr 28.


For antiviral screenings purposes, infection of cell cultures with the virus under study, should ideally result in the induction, within just a few days, of (nearly) complete CPE and allow the calculation of acceptable Z' factors (>0.5). The human Corona virus NL63 (HCoV-NL63) causes only limited CPE on different cell lines (Schildgen et al., 2006). Following infection of Vero118 cells, virus-induced CPE was too low to allow readout based on classical colorimetric methods (such as the MTS assay), even following prolonged incubation times (>7 days). To develop an antiviral screenings-assay against HCoV-NL63, we explored whether a dead-cell protease substrate could be used instead. The substrate used is a quenched peptide (bis-AAF-R110) that releases a fluorophore upon proteolytic-cleavage by proteases; the latter released from dead cells. Following different rounds of optimization a screening protocol was developed: Vero118 cells in 96-well plate format were infected with HCoV-NL63 (MOI=0.01; 200μL cell culture; 2.10(4)cells/mL, IMDM 5% FBS medium). Cultures were subsequently incubated for 5 days at 35°C after which 20μL of the peptide solution was added. Fluorescence was quantitated 2 hr after incubation at 37°C. A roughly 3-fold increase in fluorescence intensity in the infected cultures was observed as compared to the uninfected cultures with a low well-to-well variability. Z' factors calculated from different experiments were in the range of 0.6-0.8, indicating excellent assay quality. An anti-ACE2 polyclonal antiserum (that prevents coronavirus infection in cell cultures) was used as a positive control and allowed to validate the assay for antiviral screening purposes. In conclusion, in conditions where a viability staining is inadequate to quantitate virus-induced CPE, a novel simple and convenient method that detects cell-death and that is suitable for high-throughput screening purposes can be employed.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antiviral Agents / pharmacology*
  • Cell Death
  • Cell Survival
  • Chlorocebus aethiops
  • Coronavirus NL63, Human / drug effects*
  • Coronavirus NL63, Human / physiology
  • Fluorescent Dyes / chemistry
  • High-Throughput Screening Assays*
  • Host-Pathogen Interactions
  • Humans
  • Peptides / chemistry
  • Proteolysis
  • Vero Cells


  • Antiviral Agents
  • Fluorescent Dyes
  • Peptides