Human microglial CHME3 cells [65 (link)] were grown in DMEM containing 10% fetal bovine serum. Cytotoxicity of EBS was determined by using lactate dehydrogenase (LDH) assay (Roche). Briefly, cells treated with EBS at the indicated doses for overnight underwent LDH assay. Sample absorbance was determined by using an ELISA reader (molecular device) at 490 nm. For antiviral study, cells in 12-well plates were adsorbed with ZIKV at 0.1 of multiplicity of infection for 2 hours with the indicated doses of EBS, washed thoroughly to remove unbound viruses, then incubated for another 24 hours in the presence or absence of EBS. The antiviral effect of EBS was evaluated by immunofluorescence and plaque-forming assays.
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