Reference : Distinct Signal Transduction Pathways Mediate Nuclear Factor-Kappab Induction by Il-1bet...
Scientific journals : Article
Human health sciences : Oncology
http://hdl.handle.net/2268/2310
Distinct Signal Transduction Pathways Mediate Nuclear Factor-Kappab Induction by Il-1beta in Epithelial and Lymphoid Cells
English
Bonizzi, Giuseppina [> > > >]
Piette, Jacques mailto [Université de Liège - ULg > Département des sciences de la vie > Virologie - Immunologie >]
Merville, Marie-Paule mailto [Université de Liège - ULg > Département de pharmacie > Chimie médicale >]
Bours, Vincent mailto [Université de Liège - ULg > Département des sciences biomédicales et précliniques > Génétique générale et humaine]
1-Dec-1997
Journal of Immunology
159
11
5264-72
Yes (verified by ORBi)
International
0022-1767
[en] We previously demonstrated that IL-1beta-mediated induction of the nuclear factor-kappaB (NF-kappaB) transcription factor proceeds through the production of reactive oxygen intermediates in lymphoid cells, while it occurs independently of any oxidative stress in epithelial transformed cells. Indeed, inhibition of receptor internalization as well as NH4Cl and chloroquine blocked IL-1beta-mediated induction of NF-kappaB in OVCAR-3 and in other epithelial cell lines but not in lymphoid cells, indicating that distinct pathways are involved. Conversely, while we observed phospholipase A2 activity in both cell types following IL-1beta stimulation, specific inhibitors of this enzyme inhibited NF-kappaB induction only in lymphoid cells. Moreover, expression of the 5-lipoxygenase (5-LOX) enzyme was not detected in epithelial cells, and inhibition of this enzyme blocked NF-kappaB induction by IL-1beta only in lymphoid cells. This study thus indicates that the activation of NF-kappaB following IL-1beta treatment involves the activation of phospholipase A2 and 5-LOX and the production of reactive oxygen intermediates (ROIs) in lymphoid cells, while in epithelial cells, another pathway predominates and could involve the acid sphingomyelinase. Moreover, arachidonic acid could induce NF-kappaB in epithelial and lymphoid cells, but this activation involved the 5-LOX enzyme and the production of ROIs only in lymphoid cells. The inefficiency of the ROI pathway in epithelial cells is probably the consequence of both low ROI production due to undetectable expression of 5-LOX and rapid degradation of hydrogen peroxide due to high catalase activity.
http://hdl.handle.net/2268/2310

There is no file associated with this reference.

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.