Involvement of p42/p44 MAPK, JNK, and NF-kappaB in IL-1beta-induced ICAM-1 expression in human pulmonary epithelial cells

Journal of Cellular Physiology
Feng-Shu LinChuen-Mao Yang

Abstract

Interleukin-1beta (IL-1beta) has been shown to induce the expression of intercellular adhesion molecule-1 (ICAM-1) on airway epithelial cells and contributes to inflammatory responses. However, the mechanisms regulating ICAM-1 expression by IL-1beta in human A549 cells was not completely understood. Here, the roles of mitogen-activated protein kinases (MAPKs) and NF-kappaB pathways for IL-1beta-induced ICAM-1 expression were investigated in A549 cells. IL-1beta induced expression of ICAM-1 protein and mRNA in a time- and concentration-dependent manner. The IL-1beta induction of ICAM-1 mRNA and protein were partially inhibited by U0126 and PD98059 (specific inhibitors of MEK1/2) and SP600125 [a specific inhibitor of c-Jun-N-terminal kinase (JNK)]. U0126 was more potent than other inhibitors to attenuate IL-1beta-induced ICAM-1 expression. Consistently, IL-1beta stimulated phosphorylation of p42/p44 MAPK and JNK which was attenuated by pretreatment with U0126 or SP600125, respectively. Moreover, transfection with dominant negative mutants of MEK1/2 (MEK K97R) or ERK2 (ERK2 K52R) also attenuated IL-1beta-induced ICAM-1 expression. The combination of PD98059 and SP600125 displayed an additive effect on IL-1beta-induced ICAM-1 gene ...Continue Reading

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