Article (Scientific journals)
Withaferin a strongly elicits IkappaB kinase beta hyperphosphorylation concomitant with potent inhibition of its kinase activity
Kaileh, Mary; Vanden Berghe, Wim; Heyerick, Arne et al.
2007In Journal of Biological Chemistry, 282 (7), p. 4253
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Keywords :
Withaferin A; NFkappaB; IkappaB kinase beta
Abstract :
[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.
Research center :
University of Gent
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Kaileh, Mary;  Ghent University > Department of Molecular Biology > Laboratory of Eukaryotic Gene Expression and Signal Transduction (LEGEST)
Vanden Berghe, Wim
Heyerick, Arne
Horion, Julie ;  Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Anatomie et cytologie pathologiques
Piette, Jacques ;  Université de Liège - ULiège > 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)
Language :
English
Title :
Withaferin a strongly elicits IkappaB kinase beta hyperphosphorylation concomitant with potent inhibition of its kinase activity
Publication date :
2007
Journal title :
Journal of Biological Chemistry
ISSN :
0021-9258
eISSN :
1083-351X
Publisher :
American Society for Biochemistry and Molecular Biology, Baltimore, United States - Maryland
Volume :
282
Issue :
7
Pages :
4253
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 28 September 2009

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