Premium
Transcriptional regulation of CD38 expression by tumor necrosis factor‐α in human airway smooth muscle cells: role of NF‐κB and sensitivity to glucocorticoids
Author(s) -
Kang BitNa,
Tirumurugaan K. G.,
Deshpande Deepak A.,
Amrani Yassine,
Panettieri Reynold A.,
Walseth Timothy F.,
Karman Mathur S.
Publication year - 2006
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fj.05-4585fje
Subject(s) - tumor necrosis factor alpha , nf κb , tumor necrosis factor α , cd38 , cancer research , sensitivity (control systems) , microbiology and biotechnology , nfkb1 , airway , medicine , chemistry , biology , inflammation , transcription factor , gene , anesthesia , stem cell , engineering , cd34 , biochemistry , electronic engineering
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.