IAP antagonists target cIAP1 to induce TNFalpha-dependent apoptosis.

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State: Public
Version: author
Serval ID
serval:BIB_F9F8AF4594A4
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
IAP antagonists target cIAP1 to induce TNFalpha-dependent apoptosis.
Journal
Cell
Author(s)
Vince J.E., Wong W.W., Khan N., Feltham R., Chau D., Ahmed A.U., Benetatos C.A., Chunduru S.K., Condon S.M., McKinlay M., Brink R., Leverkus M., Tergaonkar V., Schneider P., Callus B.A., Koentgen F., Vaux D.L., Silke J.
ISSN
0092-8674 (Print)
ISSN-L
0092-8674
Publication state
Published
Issued date
2007
Volume
131
Number
4
Pages
682-693
Language
english
Abstract
XIAP prevents apoptosis by binding to and inhibiting caspases, and this inhibition can be relieved by IAP antagonists, such as Smac/DIABLO. IAP antagonist compounds (IACs) have therefore been designed to inhibit XIAP to kill tumor cells. Because XIAP inhibits postmitochondrial caspases, caspase 8 inhibitors should not block killing by IACs. Instead, we show that apoptosis caused by an IAC is blocked by the caspase 8 inhibitor crmA and that IAP antagonists activate NF-kappaB signaling via inhibtion of cIAP1. In sensitive tumor lines, IAP antagonist induced NF-kappaB-stimulated production of TNFalpha that killed cells in an autocrine fashion. Inhibition of NF-kappaB reduced TNFalpha production, and blocking NF-kappaB activation or TNFalpha allowed tumor cells to survive IAC-induced apoptosis. Cells treated with an IAC, or those in which cIAP1 was deleted, became sensitive to apoptosis induced by exogenous TNFalpha, suggesting novel uses of these compounds in treating cancer.
Keywords
Animals, Apoptosis/physiology, Autocrine Communication, Benzoquinones/metabolism, Brefeldin A/metabolism, Caspase 8/antagonists & inhibitors, Caspase 8/metabolism, Cell Line, Enzyme Inhibitors/metabolism, Humans, Inhibitor of Apoptosis Proteins/antagonists & inhibitors, Inhibitor of Apoptosis Proteins/genetics, Intracellular Signaling Peptides and Proteins/metabolism, Lactams, Macrocyclic/metabolism, Mice, Mitochondrial Proteins/metabolism, Molecular Mimicry, NF-kappa B/metabolism, Proteasome Endopeptidase Complex/metabolism, Protein Synthesis Inhibitors/metabolism, Receptors, Tumor Necrosis Factor, Type I/metabolism, Serpins/metabolism, Signal Transduction/physiology, TNF Receptor-Associated Factor 2/genetics, TNF Receptor-Associated Factor 2/metabolism, Tumor Necrosis Factor-alpha/metabolism, Viral Proteins/metabolism
Pubmed
Web of science
Open Access
Yes
Create date
19/01/2008 18:30
Last modification date
20/08/2019 17:25
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