Cited by 99Cell death mechanisms and regulationNF-κB Signaling PathwaysImmune Response and Inflammation

TRAF2 is a biologically important necroptosis suppressor

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Petersen, S L, Chen, T T, Lawrence, D A, Marsters, S A, Gonzalvez, F, Ashkenazi, A·2015·Cell Death & Differentiation

Abstract

Tumor necrosis factor α (TNFα) triggers necroptotic cell death through an intracellular signaling complex containing receptor-interacting protein kinase (RIPK) 1 and RIPK3, called the necrosome. RIPK1 phosphorylates RIPK3, which phosphorylates the pseudokinase mixed lineage kinase-domain-like (MLKL)-driving its oligomerization and membrane-disrupting necroptotic activity. Here, we show that TNF receptor-associated factor 2 (TRAF2)-previously implicated in apoptosis suppression-also inhibits necroptotic signaling by TNFα. TRAF2 disruption in mouse fibroblasts augmented TNFα-driven necrosome formation and RIPK3-MLKL association, promoting necroptosis. TRAF2 constitutively associated with MLKL, whereas TNFα reversed this via cylindromatosis-dependent TRAF2 deubiquitination. Ectopic interaction of TRAF2 and MLKL required the C-terminal portion but not the N-terminal, RING, or CIM region of TRAF2. Induced TRAF2 knockout (KO) in adult mice caused rapid lethality, in conjunction with increased hepatic necrosome assembly. By contrast, TRAF2 KO on a RIPK3 KO background caused delayed mortality, in concert with elevated intestinal caspase-8 protein and activity. Combined injection of TNFR1-Fc, Fas-Fc and DR5-Fc decoys prevented death upon TRAF2 KO. However, Fas-Fc and DR5-Fc were ineffective, whereas TNFR1-Fc and interferon α receptor (IFNAR1)-Fc were partially protective against lethality upon combined TRAF2 and RIPK3 KO. These results identify TRAF2 as an important biological suppressor of necroptosis in vitro and in vivo.

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Crossref · 10.1038/cdd.2015.35

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  1. Linkermann A, Green DR. Necroptosis. N Engl J Med 2014; 370: 455-465.

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Authors
Petersen, S. L., Chen, T. T., Lawrence, D. A., Marsters, S. A., Gonzalvez, F., & Ashkenazi, A.
Affiliations
Genentech (US)
Corresponding author
Ashkenazi, A
Venue
Cell Death & Differentiation
Published
2015-04-17
Volume
22
Issue
11
Pages
1846-1857
ISSN
  • 1350-9047 (ISSN-L)
  • 1476-5403
OpenAlex
W2161706122
Cited by
99
References
56
Citations by year
2026: 4 · 2025: 7 · 2024: 10 · 2023: 12 · 2022: 15 · 2021: 10 · 2020: 6 · 2019: 6 · 2018: 5 · 2017: 6 · 2016: 15 · 2015: 3
FWCI
4.17
Type
journal article
Language
en
Open access
Locations
  • Cell Death and Differentiation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Genentech
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › NF-κB Signaling Pathways
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
Keywords
TRAF2, necroptosis, necrosome, TNF signaling, RIPK3, MLKL, RIPK1, deubiquitination, CYLD, caspase-8, TNFR1, Fas, DR5, interferon alpha receptor, hepatocyte death
MeSH terms
Animals, Fibroblasts, Immunohistochemistry, Protein Binding, Protein Kinases, Cell Death, Apoptosis, Mice, Knockout, TNF Receptor-Associated Factor 2, Mice, Receptor-Interacting Protein Serine-Threonine Kinases, Ubiquitination

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