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TRAIL is a potent inducer of apoptosis and has been studied almost exclusively in this context. However, TRAIL can also induce NFκB-dependent expression of multiple pro-inflammatory cytokines and chemokines. Surprisingly, whereas inhibition of caspase activity blocked TRAIL-induced apoptosis, but not cytokine production, knock down or deletion of caspase-8 suppressed both outcomes, suggesting that caspase-8 participates in TRAIL-induced inflammatory signaling in a scaffold role. Consistent with this, introduction of a catalytically inactive caspase-8 mutant into CASP-8 null cells restored TRAIL-induced cytokine production, but not cell death. Furthermore, affinity precipitation of the native TRAIL receptor complex revealed that pro-caspase-8 was required for recruitment of RIPK1, via FADD, to promote NFκB activation and pro-inflammatory cytokine production downstream. Thus, caspase-8 can serve in two distinct roles in response to TRAIL receptor engagement, as a scaffold for assembly of a Caspase-8-FADD-RIPK1 "FADDosome" complex, leading to NFκB-dependent inflammation, or as a protease that promotes apoptosis.
Pubmed ID: 28212752 RIS Download
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