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Assay Method Information

Assay Name:  DRC analysis by immunofluorescence
Description:  Ten-point DRCs were generated for each drug. Vero cells were seeded at 1.2 ◊ 104 cells per well in DMEM, supplemented with 2% FBS and 1◊ antibiotic-antimycotic solution (Gibco), in black, 384-well μClear plates (Greiner Bio-One) 24 h prior to the experiment. Ten-point DRCs were generated, with compound concentrations ranging from 0.1 to 50 μM. For the viral infections, plates were transferred into the BSL3 containment facility and SARS-CoV-2 was added at a multiplicity of infection (MOI) of 0.0125. The cells were fixed at 24 hours postinfection (hpi) with 4% PFA and analyzed by immunofluorescence. The acquired images were analyzed using in-house software to quantify cell numbers and infection ratios, and antiviral activity was normalized to positive (mock) and negative (0.5% DMSO) controls in each assay plate. DRCs were fitted by sigmoidal dose-response models, with the following equation: Y = bottom + (top − bottom)/[1 + (IC50/X)Hillslope], using XLfit 4 software or Prism7. IC50 values were calculated from the normalized activity data set-fitted curves. All IC50 and 50% cytotoxic concentration (CC50) values were measured in duplicate, and the quality of each assay was controlled by Zí-factor and the coefficient of variation in percent (%CV).
Affinity data for this assay
 

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Last update November 1, 2007
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