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Title: Transcriptional regulation of CD38 expression by tumor necrosis factor-alpha in human airway smooth muscle cells: role of NF-kappaB and sensitivity to glucocorticoids.
Authors: Kang, BN
Tirumurugaan, KG
Deshpande, DA
Amrani, Y
Panettieri, RA
Walseth, TF
Kannan, MS
First Published: May-2006
Citation: FASEB J, 2006, 20 (7), pp. 1000-1002
Abstract: The transmembrane glycoprotein CD38 catalyzes the synthesis of the calcium mobilizing molecule cyclic ADP-ribose from NAD. In human airway smooth muscle (HASM) cells, the expression and function of CD38 are augmented by the inflammatory cytokine tumor necrosis factor-alpha (TNF-alpha), leading to increased intracellular calcium response to agonists. A glucocorticoid response element in the CD38 gene has been computationally described, providing evidence for transcriptional regulation of its expression. In the present study, we investigated the effects of dexamethasone, a glucocorticoid, on CD38 expression and ADP-ribosyl cyclase activity in HASM cells stimulated with TNF-alpha. In HASM cells, TNF-alpha augmented CD38 expression and ADP-ribosyl cyclase activity, which were attenuated by dexamethasone. TNF-alpha increased NF-kappaB expression and its activation, and dexamethasone partially reversed these effects. TNF-alpha increased the expression of IkappaBalpha, and dexamethasone increased it further. An inhibitor of NF-kappaB activation or transfection of cells with IkappaB mutants decreased TNF-alpha-induced CD38 expression. The results indicate that TNF-alpha-induced CD38 expression involves NF-kappaB expression and its activation and dexamethasone inhibits CD38 expression through NF-kappaB-dependent and -independent mechanisms.
DOI Link: 10.1096/fj.05-4585fje
eISSN: 1530-6860
Type: Journal Article
Appears in Collections:Published Articles, Dept. of Infection, Immunity and Inflammation

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