Cited by 421Cell death mechanisms and regulationImmune Response and InflammationNF-κB Signaling Pathways

RIPK1 counteracts ZBP1-mediated necroptosis to inhibit inflammation

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Lin, Juan, Kumari, Snehlata, Kim, Chun, Van, Trieu-My, Wachsmuth, Laurens, Polykratis, Apostolos, Pasparakis, Manolis·2016·Nature

Abstract

Receptor-interacting protein kinase 1 (RIPK1) regulates cell death and inflammation through kinase-dependent and -independent functions. RIPK1 kinase activity induces caspase-8-dependent apoptosis and RIPK3 and mixed lineage kinase like (MLKL)-dependent necroptosis. In addition, RIPK1 inhibits apoptosis and necroptosis through kinase-independent functions, which are important for late embryonic development and the prevention of inflammation in epithelial barriers. The mechanism by which RIPK1 counteracts RIPK3-MLKL-mediated necroptosis has remained unknown. Here we show that RIPK1 prevents skin inflammation by inhibiting activation of RIPK3-MLKL-dependent necroptosis mediated by Z-DNA binding protein 1 (ZBP1, also known as DAI or DLM1). ZBP1 deficiency inhibited keratinocyte necroptosis and skin inflammation in mice with epidermis-specific RIPK1 knockout. Moreover, mutation of the conserved RIP homotypic interaction motif (RHIM) of endogenous mouse RIPK1 (RIPK1 mRHIM) caused perinatal lethality that was prevented by RIPK3, MLKL or ZBP1 deficiency. Furthermore, mice expressing only RIPK1 mRHIM in keratinocytes developed skin inflammation that was abrogated by MLKL or ZBP1 deficiency. Mechanistically, ZBP1 interacted strongly with phosphorylated RIPK3 in cells expressing RIPK1 mRHIM, suggesting that the RIPK1 RHIM prevents ZBP1 from binding and activating RIPK3. Collectively, these results show that RIPK1 prevents perinatal death as well as skin inflammation in adult mice by inhibiting ZBP1-induced necroptosis. Furthermore, these findings identify ZBP1 as a critical mediator of inflammation beyond its previously known role in antiviral defence and suggest that ZBP1 might be implicated in the pathogenesis of necroptosis-associated inflammatory diseases.

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  • RIPK3 can be activated following RHIM-dependent interaction with ZBP1, which operates as sensor for cytosolic DNA-promoting type I IFN synthesis and NF-κB activation.

    “or (2) ZBP1, which operates as a sensor for cytosolic DNA-promoting type I interferon (IFN) synthesis and NF-κB activation [439–441].”
  • Absence of Ripk1 from keratinocytes promotes spontaneous necroptosis and consequent cutaneous inflammation, which can be prevented by co-deletion of Ripk3, Mlkl, or Zbp1 but not Fadd.

    “Likewise, the absence of Ripk1 from keratinocytes promotes spontaneous necroptosis and consequent cutaneous inflammation, which can be prevented by the co-deletion of Ripk3, Mlkl, or Zbp1 but not Fadd [440, 502].”
  • ZBP1 acts at initial steps of necroptosis by mediating sequential activation of RIPK3 and MLKL.

    “ZBP1 acts at the initial steps of necroptosis by mediating the sequential activation of RIPK3 and MLKL.”
  • Mice expressing variant of RIPK1 mutated in RHIM domain die perinatally, a phenotype that can be rescued by concurrent Ripk3, Mlkl, or Zbp1 (but not Ticam1) deletion, as well as by knock-in of catalytically inactive RIPK3 or RIPK3 mutated in RHIM domain.

    “Moreover, mice expressing a variant of RIPK1 mutated in the RHIM domain die perinatally, a phenotype that can be rescued by concurrent Ripk3, Mlkl, or Zbp1 (but not Ticam1) deletion, as well as by the knock-in of catalytically inactive RIPK3 or RIPK3 mutated in the RHIM domain [440, 441].”

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Authors
Lin, J., Kumari, S., Kim, C., Van, T.-M., Wachsmuth, L., Polykratis, A., & Pasparakis, M.
Affiliations
University of Cologne (DE)
Corresponding author
Pasparakis, Manolis
Venue
Nature
Published
2016-11-07
Volume
540
Issue
7631
Pages
124-128
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2547911415
Cited by
421
References
32
Citations by year
2026: 39 · 2025: 63 · 2024: 48 · 2023: 40 · 2022: 42 · 2021: 45 · 2020: 52 · 2019: 33 · 2018: 41 · 2017: 17 · 2016: 1
FWCI
15.85
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • Kölner Universitäts PublikationsServer (Universität zu Köln) (publishedVersion)
  • PubMed Central (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
Genentech
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › NF-κB Signaling Pathways
Keywords
RIPK1, ZBP1, necroptosis, RIPK3, MLKL, skin inflammation, RHIM domain, keratinocytes, perinatal lethality, innate immunity, epidermis, inflammatory skin diseases, DAI, cell death regulation
MeSH terms
Protein Domains, Animals, Glycoproteins, Inflammation, Mutation, Necrosis, Phosphorylation, Protein Kinases, Skin, Keratinocytes, RNA-Binding Proteins, Apoptosis, Mice, Receptor-Interacting Protein Serine-Threonine Kinases

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