At each time point, the supernatants of HaCat cells were harvested, and the secretion of interleukin-6 (IL-6) in the culture media was evaluated by an ELISA kit (both from Enzo Life Sciences, Farmingdale, NY, USA), according to the manufacturer’s instructions. The optical density values were obtained by measuring the absorbance at 450 using a Multiscan GO microplate spectrophotometer (Thermo Fisher Scientific).
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