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Lawlor, Kate E; Khan, Nufail; Mildenhall, Alison; Gerlic, Motti; Croker, Ben A; D'Cruz, Akshay A; Hall, Cathrine; Kaur Spall, Sukhdeep; Anderton, Holly; Masters, Seth L; Rashidi, Maryam; Wicks, Ian P; Alexander, Warren S; Mitsuuchi, Yasuhiro; Benetatos, Christopher A; Condon, Stephen M; Wong, W Wei-Lynn; Silke, John; Vaux, David L; Vince, James E
Nature communications, 02/2015, Letnik: 6, Številka: 1Journal Article
RIPK3 and its substrate MLKL are essential for necroptosis, a lytic cell death proposed to cause inflammation via the release of intracellular molecules. Whether and how RIPK3 might drive inflammation in a manner independent of MLKL and cell lysis remains unclear. Here we show that following LPS treatment, or LPS-induced necroptosis, the TLR adaptor protein TRIF and inhibitor of apoptosis proteins (IAPs: X-linked IAP, cellular IAP1 and IAP2) regulate RIPK3 and MLKL ubiquitylation. Hence, when IAPs are absent, LPS triggers RIPK3 to activate caspase-8, promoting apoptosis and NLRP3-caspase-1 activation, independent of RIPK3 kinase activity and MLKL. In contrast, in the absence of both IAPs and caspase-8, RIPK3 kinase activity and MLKL are essential for TLR-induced NLRP3 activation. Consistent with in vitro experiments, interleukin-1 (IL-1)-dependent autoantibody-mediated arthritis is exacerbated in mice lacking IAPs, and is reduced by deletion of RIPK3, but not MLKL. Therefore RIPK3 can promote NLRP3 inflammasome and IL-1β inflammatory responses independent of MLKL and necroptotic cell death.
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in: SICRIS
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