Abstract:
:The kinases RIPK1 and RIPK3 and the pseudo-kinase MLKL have been identified as key regulators of the necroptotic cell death pathway, although a role for MLKL within the whole animal has not yet been established. Here, we have shown that MLKL deficiency rescued the embryonic lethality caused by loss of Caspase-8 or FADD. Casp8(-/-)Mlkl(-/-) and Fadd(-/-)Mlkl(-/-) mice were viable and fertile but rapidly developed severe lymphadenopathy, systemic autoimmune disease, and thrombocytopenia. These morbidities occurred more rapidly and with increased severity in Casp8(-/-)Mlkl(-/-) and Fadd(-/-)Mlkl(-/-) mice compared to Casp8(-/-)Ripk3(-/-) or Fadd(-/-)Ripk3(-/-) mice, respectively. These results demonstrate that MLKL is an essential effector of aberrant necroptosis in embryos caused by loss of Caspase-8 or FADD. Furthermore, they suggest that RIPK3 and/or MLKL may exert functions independently of necroptosis. It appears that non-necroptotic functions of RIPK3 contribute to the lymphadenopathy, autoimmunity, and excess cytokine production that occur when FADD or Caspase-8-mediated apoptosis is abrogated.
journal_name
Immunityjournal_title
Immunityauthors
Alvarez-Diaz S,Dillon CP,Lalaoui N,Tanzer MC,Rodriguez DA,Lin A,Lebois M,Hakem R,Josefsson EC,O'Reilly LA,Silke J,Alexander WS,Green DR,Strasser Adoi
10.1016/j.immuni.2016.07.016subject
Has Abstractpub_date
2016-09-20 00:00:00pages
513-526issue
3eissn
1074-7613issn
1097-4180pii
S1074-7613(16)30289-8journal_volume
45pub_type
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