Cited by 211Cell death mechanisms and regulationAutophagy in Disease and TherapyFerroptosis and cancer prognosis

Obatoclax (GX15-070) triggers necroptosis by promoting the assembly of the necrosome on autophagosomal membranes

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Basit, F, Cristofanon, S, Fulda, S·2013·Cell Death & Differentiation

Abstract

Obatoclax (GX15-070), a small-molecule inhibitor of antiapoptotic Bcl-2 proteins, has been reported to trigger cell death via autophagy. However, the underlying molecular mechanisms have remained elusive. Here, we identify GX15-070-stimulated assembly of the necrosome on autophagosomal membranes as a key event that connects GX15-070-stimulated autophagy to necroptosis. GX15-070 predominately induces a non-apoptotic form of cell death in rhabdomyosarcoma cells, as evident by lack of typical apoptotic features such as DNA fragmentation or caspase activation and by insensitivity to the broad-range caspase inhibitor zVAD.fmk. Instead, GX15-070 triggers massive accumulation of autophagosomes, which are required for GX15-070-induced cell death, as blockade of autophagosome formation by silencing of Atg5 or Atg7 abolishes GX15-070-mediated cell death. Co-immunoprecipitation studies reveal that GX15-070 stimulates the interaction of Atg5, a constituent of autophagosomal membranes, with components of the necrosome such as FADD, RIP1 and RIP3. This GX15-070-induced assembly of the necrosome on autophagosomes occurs in a Atg5-dependent manner, as knockdown of Atg5 abrogates formation of this complex. RIP1 is necessary for GX15-070-induced cell death, as both genetic and pharmacological inhibition of RIP1 by shRNA-mediated knockdown or by the RIP1 inhibitor necrostatin-1 blocks GX15-070-induced cell death. Similarly, RIP3 knockdown rescues GX15-070-mediated cell death and suppression of clonogenic survival. Interestingly, RIP1 or RIP3 silencing has no effect on GX15-070-stimulated autophagosome formation, underlining that RIP1 and RIP3 mediate cell death downstream of autophagy induction. Of note, GX15-070 significantly suppresses tumor growth in a RIP1-dependent manner in the chorioallantoic membrane model in vivo. In conclusion, GX15-070 triggers necroptosis by promoting the assembly of the necrosome on autophagosomes. These findings provide novel insights into the molecular mechanisms of GX15-070-induced non-apoptotic cell death.

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Authors
Basit, F., Cristofanon, S., & Fulda, S.
Affiliations
Goethe University Frankfurt (DE)
Corresponding author
Fulda, S
Venue
Cell Death & Differentiation
Published
2013-06-07
Volume
20
Issue
9
Pages
1161-1173
ISSN
  • 1350-9047 (ISSN-L)
  • 1476-5403
OpenAlex
W1973671033
Cited by
211
References
47
Citations by year
2026: 5 · 2025: 9 · 2024: 12 · 2023: 10 · 2022: 7 · 2021: 13 · 2020: 20 · 2019: 12 · 2018: 14 · 2017: 21 · 2016: 27 · 2015: 30 · 2014: 21 · 2013: 8
FWCI
12.85
Type
journal article
Language
en
Update notices
erratum (2014-06-09)
Open access
Locations
  • Cell Death and Differentiation (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Deutsche Krebshilfe
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Ferroptosis and cancer prognosis
Keywords
obatoclax, necroptosis, autophagy, autophagosomes, ATG5, RIPK1, RIPK3, FADD, BCL-2 inhibitor, rhabdomyosarcoma, necrostatin-1, tumor growth inhibition, chorioallantoic membrane model, non-apoptotic cell death
MeSH terms
Autophagy-Related Protein 5, Autophagy-Related Protein 7, Autophagy, Cell Line, Humans, Imidazoles, Indoles, Microtubule-Associated Proteins, Necrosis, Phagosomes, Pyrroles, Cell Death, GTPase-Activating Proteins, RNA Interference, RNA, Small Interfering, Fas-Associated Death Domain Protein, Receptor-Interacting Protein Serine-Threonine Kinases, HEK293 Cells

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