The antiviral effect of the compounds (at the maximum non-toxic dose) were assessed before infection (pre-treatment of cells), during infection (co-treatment) and after infection (post-treatment). During pre-treatment, the cells (50,000 cells/well) were pre-treated with compound at 37 °C for 24 h. Then the compound containing culture supernatant was removed and the cells were infected with 0.1 MOI of DENV-2. After infection, the cells were washed twice to remove the unbounded virus and kept for incubation by adding maintenance media (MEM with antibiotics and 2% Fetal bovine serum). In co-treatment, the virus was mixed with different concentrations of the compound and the mixture was used for infecting cells for duration of one h. For post-treatment, the cells were infected with 0.1 MOI DENV-2 for 1 h. and treated with the compound after 24 h. For all types of treatments, the cells were incubated for five days post-infection. In the virus control, wells contain only infected cells without any treatment while the cell control contains uninfected cells only. In all conditions, plates were frozen at −80 °C and thawed to collect cell supernatant for quantitative estimation of viral RNA.
For the compound α-Mangostin which showed antiviral activity, the assays were repeated under pre-, co- and post-treatment conditions with different concentrations of the compounds as described earlier. The collected supernatant was used for determination of viral genomic RNA level by real-time RT-PCR and titer of infectious virus particle by focus forming unit assay. All the experiments were performed in triplicates in two independent trials.
For the compound α-Mangostin which showed antiviral activity, the assays were repeated under pre-, co- and post-treatment conditions with different concentrations of the compounds as described earlier. The collected supernatant was used for determination of viral genomic RNA level by real-time RT-PCR and titer of infectious virus particle by focus forming unit assay. All the experiments were performed in triplicates in two independent trials.
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