Effects of CYSLTR1 silencing and overexpression on phosphorylation of ERK1/2 in human adenoid epithelial cells. (A) Representative results of western blot analysis. (B) Normalized level of p-ERK1/2 in different groups of cells. *P<0.05. ERK, extracellular signal-regulated kinase; CYSLTR1, cysteinyl leukotriene receptor 1; p, phosphorylated; si, small interfering; NC, negative control; over-NC, transfection with empty pIRSE2-EGFP.