In mycoplasmal pneumonia, the bronchi are histopathologically filled with polymorphonuclear leukocytes. The EGFR pathway is involved in IL-8 production. We investigated the contribution of the EGFR pathway to IL-8 production by bronchial epithelial cells (A549) stimulated with Mp-Ag. The IL-8 production by A549 cells stimulated with Mp-Ag was decreased by the addition of an EGFR kinase inhibitor or transfection with small interfering RNA against EGFR. The levels of epiregulin mRNA in A549 cells were increased by stimulation with Mp-Ag. In conclusion, the EFGR pathway participates in IL-8 production by bronchial epithelial cells stimulated with Mp-Ag.
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