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 (Ripk3 mice), thus abolishing its kinase activity. Ripk3 cells were resistant to necroptosis stimulation in vitro, and Ripk3 mice were protected from necroptotic diseases. Although the Ripk3 mutation rescued embryonic lethality in Fadd embryos, FaddRipk3 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.
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http://dx.doi.org/10.1016/j.celrep.2017.04.011 | DOI Listing |
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