RIPK3 Mediates Necroptosis during Embryonic Development and Postnatal Inflammation in Fadd-Deficient Mice

Cell Rep. 2017 Apr 25;19(4):798-808. doi: 10.1016/j.celrep.2017.04.011.

Abstract

RIPK3 mediates cell death and regulates inflammatory responses. Although genetic studies have suggested that RIPK3-MLKL-mediated necroptosis leads to embryonic lethality in Fadd or Caspase-8-deficient mice, the exact mechanisms are not fully understood. Here, we generated Ripk3 mutant mice by altering the RIPK3 kinase domain (Ripk3Δ/Δ mice), thus abolishing its kinase activity. Ripk3Δ/Δ cells were resistant to necroptosis stimulation in vitro, and Ripk3Δ/Δ mice were protected from necroptotic diseases. Although the Ripk3Δ/Δ mutation rescued embryonic lethality in Fadd-/- embryos, Fadd-/-Ripk3Δ/Δ mice died within 1 day after birth due to massive inflammation. These results indicate that Ripk3 ablation rescues embryonic lethality in Fadd-deficient mice by suppressing two RIPK3-mediating processes: necroptosis during embryogenesis and inflammation during postnatal development in Fadd-/- mice.

Keywords: Fadd; RIPK3; cell death; embryogenesis; inflammation; kinase activity; necroptosis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Apoptosis* / drug effects
  • Caspase 8 / genetics
  • Caspase 8 / metabolism
  • Ceruletide / toxicity
  • Chemokines / metabolism
  • Cytokines / analysis
  • Cytokines / metabolism
  • Embryo, Mammalian / metabolism
  • Embryonic Development / drug effects
  • Fas-Associated Death Domain Protein / deficiency
  • Fas-Associated Death Domain Protein / genetics*
  • HEK293 Cells
  • Humans
  • Inflammation
  • Lipopolysaccharides / toxicity
  • Macrophages / cytology
  • Macrophages / drug effects
  • Macrophages / metabolism
  • Mice
  • Mice, Knockout
  • Mutagenesis
  • Necrosis
  • Oligopeptides / pharmacology
  • Pancreatitis / chemically induced
  • Pancreatitis / pathology
  • Phosphorylation
  • Protein Kinases / metabolism
  • Receptor-Interacting Protein Serine-Threonine Kinases / genetics
  • Receptor-Interacting Protein Serine-Threonine Kinases / metabolism*

Substances

  • Chemokines
  • Cytokines
  • Fadd protein, mouse
  • Fas-Associated Death Domain Protein
  • Lipopolysaccharides
  • Oligopeptides
  • benzyloxycarbonyl-valyl-alanyl-aspartic acid
  • Ceruletide
  • MLKL protein, mouse
  • Protein Kinases
  • Receptor-Interacting Protein Serine-Threonine Kinases
  • Ripk3 protein, mouse
  • Caspase 8