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B mediate COX-2 expression in human airway myocytes
1Department of Pharmacology and 2Cell and Molecular Biology Program, University of Nevada School of Medicine, Reno, Nevada 89557-0046
Submitted 27 November 2002 ; accepted in final form 17 July 2003
We have previously demonstrated that p38 and extracellular signal-regulated protein kinase (ERK) mitogen-activated protein kinases (MAPK) are components of proinflammatory induced cytokine expression in human airway myocytes. The experiments described here further these studies by examining p38 MAPK and NF-
B regulation of cyclooxygenase-2 (COX-2) expression in response to a complex inflammatory stimulus consisting of 10 ng/ml interleukin (IL)-1
, tumor necrosis factor-
(TNF-
), and interferon (IFN)-
. COX-2 expression was induced with this stimulus in a time-dependent manner, with maximal expression seen 12-20 h after treatment. Semiquantitative RT-PCR and immunoblotting experiments demonstrate decreased COX-2 expression following treatment with the p38 MAPK inhibitor SB-203580 (25 µM) or the proteosome inhibitor MG-132 (1 µM). SB-203580 did not affect cytokine-stimulated I
B
degradation, NF-
B nuclear binding activity, or NF-
B-dependent signaling from the COX-2 promoter, indicating that p38 MAPK and NF-
B may affect COX-2 expression via separate signaling pathways. SB-203580, but not MG-132, also increased the initial rate of COX-2 mRNA decay, indicating p38 MAPK, but not NF-
B, participates in the regulation of COX-2 mRNA stability. These findings suggest that although p38 MAPK and NF-
B signaling regulate steady-state levels of COX-2 expression, p38 MAPK additionally affects stability of COX-2 mRNA in cytokine-stimulated human airway myocytes.
inflammation; mitogen-activated protein kinase; mRNA stability; cytokines
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