Reference : Withaferin a strongly elicits IkappaB kinase beta hyperphosphorylation concomitant with ...
Scientific journals : Article
Life sciences : Biochemistry, biophysics & molecular biology
http://hdl.handle.net/2268/24141
Withaferin a strongly elicits IkappaB kinase beta hyperphosphorylation concomitant with potent inhibition of its kinase activity
English
Kaileh, Mary [Ghent University > Department of Molecular Biology > Laboratory of Eukaryotic Gene Expression and Signal Transduction (LEGEST) >]
Vanden Berghe, Wim [> >]
Heyerick, Arne [> >]
Horion, Julie mailto [Université de Liège - ULg > Département des sciences biomédicales et précliniques > Anatomie et cytologie pathologiques >]
Piette, Jacques mailto [Université de Liège - ULg > Département des sciences de la vie > GIGA-R : Virologie - Immunologie - Département des sciences de la vie - GIGA-Research >]
Libert, Claude [> >]
De Keukeleire, Denis [> >]
Essawi, Tamer [> >]
Haegeman, Guy [Ghent University > Department of Molecular Biology > Laboratory of Eukaryotic Gene Expression and Signal Transduction (LEGEST) >]
2007
Journal of Biological Chemistry
American Society for Biochemistry and Molecular Biology
282
7
4253
Yes (verified by ORBi)
International
0021-9258
1083-351X
Baltimore
MD
[en] Withaferin A ; NFkappaB ; IkappaB kinase beta
[en] The transcription factor NFkappaB plays a critical role in normal and pathophysiological immune responses. Therefore, NFkappaB and the signaling pathways that regulate its activation have become a major focus of drug development programs. Withania somnifera (WS) is a medicinal plant that is widely used in Palestine for the treatment of various inflammatory disorders. In this study we show that the leave extract of WS, as well as its major constituent withaferin A (WA), potently inhibits NFkappaB activation by preventing the tumor necrosis factor-induced activation of IkappaB kinase beta via a thioalkylation-sensitive redox mechanism, whereas other WS-derived steroidal lactones, such as withanolide A and 12-deoxywithastramonolide, are far less effective. To our knowledge, this is the first communication of IkappaB kinase beta inhibition by a plant-derived inhibitor, coinciding with MEK1/ERK-dependent Ser-181 hyperphosphorylation. This prevents IkappaB phosphorylation and degradation, which subsequently blocks NFkappaB translocation, NFkappaB/DNA binding, and gene transcription. Taken together, our results indicate that pure WA or WA-enriched WS extracts can be considered as a novel class of NFkappaB inhibitors, which hold promise as novel anti-inflammatory agents for treatment of various inflammatory disorders and/or cancer.
University of Gent
http://hdl.handle.net/2268/24141

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