Figure 7: The effects of eckol and dieckol on the expression of inflammatory cytokines in human epidermal keratinocytes exposed to PM10. The cells were exposed to PM10 (100 μg mL−1) for 24 h in the absence and presence of eckol or dieckol (10 μg mL−1). The mRNA levels of TNF-α (a), IL-1β (b), IL-6 (c), and IL-8 (d) were analyzed by qRT-PCR and normalized to those of GAPDH, a housekeeping gene. The data are presented as the percentage of the control value (mean ± SE, ). < 0.05 versus PM10 control.