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- W1565248052 abstract "Abstract Expression of the inflammatory chemokine, growth-related oncogene protein-α (GRO-α), from airway smooth muscle cells (ASMC) is regulated by pathways involving NF-κB and MAPK activation. We determined the effects of dexamethasone on GRO-α induced by IL-1β or TNF-α with respect to the role of MAPK pathways and of MAPK phosphatase-1 (MKP-1). Human ASMC were studied in primary culture at confluence. Dexamethasone (10−8–10−5 M) partially inhibited GRO-α expression and release induced by IL-1β and TNF-α; this was associated with an inhibition of JNK, but not of p38 or ERK phosphorylation. Together with IL-1β or TNF-α, dexamethasone rapidly induced mRNA and protein expression of MKP-1, which dephosphorylates MAPKs. Using MKP-1 small interfering RNA (siRNA) to block the expression of IL-1β- and dexamethasone-induced MKP-1 by 50%, JNK phosphorylation was doubled. The inhibitory effect of dexamethasone on GRO-α release was partially reversed in ASMC treated with MKP-1 siRNA compared with those treated with scrambled siRNA. In contrast, overexpression of MKP-1 led to a reduction in IL-1β-induced release of GRO-α, but the inhibitory effects of dexamethasone were preserved. Nuclear translocation of the glucocorticoid receptor was increased in ASMC exposed to dexamethasone and IL-1β. Using chromatin immunoprecipitation assay, glucocorticoid receptor binding to the MKP-1 promoter was increased by IL-1β and dexamethasone compared with either alone. Glucocorticoids and IL-1β or TNF-α modulate GRO-α release partly through the inhibition of JNK pathway, resulting from an up-regulation of MKP-1 expression." @default.
- W1565248052 created "2016-06-24" @default.
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- W1565248052 date "2007-06-01" @default.
- W1565248052 modified "2023-10-17" @default.
- W1565248052 title "Corticosteroid Inhibition of Growth-Related Oncogene Protein-α via Mitogen-Activated Kinase Phosphatase-1 in Airway Smooth Muscle Cells" @default.
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- W1565248052 doi "https://doi.org/10.4049/jimmunol.178.11.7366" @default.
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