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Activation of MEK/ERK pathways through NF-κB activation is involved in interleukin-1β-induced cyclooxygenease-2 expression in canine dermal fibroblasts.

Vet. Immunol. Immunopathol.2015 Dec 15;168(3-4):223-32. Epub 2015 Oct 09
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摘要


The proinflammatory cytokine interleukin-1β (IL-1β) induced cyclooxygenases-2 (COX-2) mRNA expression and lipid mediator prostaglandin E2 release and in a time- and dose-dependent manner in canine dermal fibroblasts. The MEK inhibitor U0126 and the ERK inhibitor FR180204 clearly inhibited IL-1β-induced prostaglandin E2 release and COX-2 mRNA expression. IL-1β enhanced ERK1/2 phosphorylation, which was attenuated by inhibitors of MEK and ERK. The NF-κB inhibitor BAY 11-7082 also suppressed IL-1β-induced prostaglandin E2 release and COX-2 mRNA expression. Treatment of fibroblasts with IL-1β led to the phosphorylation of p65 and degradation of IκBα occurred, indicating that IL-1β treatment activated NF-κB. MEK and ERK1/2 inhibitors had no effect on the phosphorylation of p65 subunit induced by IL-1β, whereas the NF-κB inhibitor completely blocked IL-1β-induced phosphorylation of ERK1/2. We also observed that IκBα-knockdown enhanced the phosphorylation of p65 and ERK1/2. These findings suggest that stimulation of MEK/ERK signaling pathway by NF-κB activation regulates IL-1β-induced COX-2 expression and subsequent prostaglandin E2 release in canine dermal fibroblasts.

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