The viability of BEAS-2B cells was assessed by CCK-8 assay using the Cell Counting Kit-8 (CCK-8) assay kit (MedChemExpress, Monmouth Junction, NJ, USA) following the manufacturer’s instructions as previously described [29 (link),30 (link)]. Briefly, transfected or non-transfected cells were inoculated into 96-well plates. At the indicated time points after treatment, 10 μl of CCK-8 solution was added to each well of the plates and incubated for an additional 3 h. Next, the absorbance was examined at 450 nm. Cell viability = (OD experiment group – OD blank group)/(ODnormoxia group (0 h) – OD blank group (0 h)) *100%.
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