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Identification of DR5 as a critical, NF-κB-regulated mediator of Smac-induced apoptosis
- Smac mimetic promotes apoptosis by neutralizing inhibitor of apoptosis (IAP) proteins and is considered as a promising cancer therapeutic. Although an autocrine/paracrine tumor necrosis factor-α (TNFα) loop has been implicated in Smac mimetic-induced cell death, little is yet known about additional factors that determine sensitivity to Smac mimetic. Using genome-wide gene expression analysis, we identify death receptor 5 (DR5) as a novel key mediator of Smac mimetic-induced apoptosis. Although several cell lines that are sensitive to the Smac mimetic BV6 die in a TNFα-dependent manner, A172 glioblastoma cells undergo BV6-induced apoptosis largely independently of TNFα/TNFR1, as the TNFα-blocking antibody Enbrel or TNFR1 knockdown provide little protection. Yet, BV6-stimulated nuclear factor-κB (NF-κB) activation is critically required for apoptosis, as inhibition of NF-κB by overexpression of dominant-negative IκBα superrepressor (IκBα-SR) blocks BV6-induced apoptosis. Unbiased genome-wide gene expression studies in IκBα-SR-overexpressing cells versus vector control cells reveal that BV6 increases DR5 expression in a NF-κB-dependent manner. Importantly, this BV6-stimulated upregulation of DR5 is critically required for apoptosis, as transient or stable knockdown of DR5 significantly inhibits BV6-triggered apoptosis. In addition, DR5 silencing attenuates formation of a RIP1/FADD/caspase-8 cytosolic cell death complex and activation of caspase-8, -3 and -9. By identifying DR5 as a critical mediator of Smac mimetic-induced apoptosis, our findings provide novel insights into the determinants that control susceptibility of cancer cells to Smac mimetic.
Author: | Ines Eckhardt, Stefanie Rösler, Simone FuldaORCiDGND |
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URN: | urn:nbn:de:hebis:30:3-355525 |
DOI: | https://doi.org/10.1038/cddis.2013.457 |
ISSN: | 2041-4889 |
Pubmed Id: | https://pubmed.ncbi.nlm.nih.gov/24287697 |
Parent Title (English): | Cell death & disease |
Publisher: | Nature Publishing Group |
Place of publication: | London [u.a.] |
Document Type: | Article |
Language: | English |
Date of Publication (online): | 2013/11/28 |
Date of first Publication: | 2013/11/28 |
Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
Release Date: | 2014/11/22 |
Tag: | Apoptosis; DR5; IAP proteins; Smac; glioblastoma |
Volume: | 4 |
Issue: | e936 |
Page Number: | 14 |
Note: | Copyright © 2013 Macmillan Publishers Limited This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/ |
HeBIS-PPN: | 366863541 |
Institutes: | Medizin / Medizin |
Dewey Decimal Classification: | 6 Technik, Medizin, angewandte Wissenschaften / 61 Medizin und Gesundheit / 610 Medizin und Gesundheit |
Sammlungen: | Universitätspublikationen |
Licence (German): | ![]() |