Effect of PD98059 (PD), U0126, Raf1 kinase inhibitor I (Raf I), SB202190 (SB), and SP600125 (SP) on CCL20 protein expression in BEAS-2Bs. The cells were pretreated for 1 hr as indicated before the 24-hr stimulation of IL-17F, and then CCL20 protein levels in supernatants were measured by ELISA. The values are expressed as (). * versus IL-17F-stimulated cells in the absence of the inhibitor. ** versus the presence of individual inhibitor.