Oral epithelial cells PCS-200-014 (Primary gingival keratinocytes (PGK; ATCC® PCS-200-014™) were purchased from American Type Culture Collection (ATCC; Manassas, VA, USA). Lung Fibroblast cells WI-38 were obtained from VACSERA Tissue Culture Unit, Cairo, Egypt. The cells were propagated in Dulbecco’s modified Eagle’s medium (DMEM) supplemented with 10% heat-inactivated fetal bovine serum, 1% L-glutamine, HEPES buffer, and 50 µg/mL gentamycin. All cells were maintained at 37 °C in a humidified atmosphere with 5% CO2 [44 (link)].
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