Cytotoxicity of S. aureus and PLNC8 αβ on HaCaT cells was determined by measuring the activity of extracellular lactate dehydrogenase (LDH) using the LDH cytotoxicity assay (Thermo Scientific ™ Pierce ™ LDH Cytotoxicity Assay Kit). The procedure was performed according to the manufacturer’s instructions. The method relies on the fact that the cytosolic enzyme LDH is released into the surrounding cell culture media if the cell membrane is damaged. Extracellular LDH undergoes an enzymatic reaction with the assay chemicals culminating in the formation of a red formazan compound, which is measured in a spectrophotometer at 490 nm.
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