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Non-canonical Caspase-1 Signaling Drives RIP2-Dependent and TNF-α-Mediated Inflammation In Vivo.
Reinke, Sören Linge, Mary Diebner, Hans H Luksch, Hella Glage, Silke Gocht, Anne Robertson, Avril A B Cooper, Matthew A Hofmann, Sigrun R Naumann, Ronald
Reinke, Sören
Linge, Mary
Diebner, Hans H
Luksch, Hella
Glage, Silke
Gocht, Anne
Robertson, Avril A B
Cooper, Matthew A
Hofmann, Sigrun R
Naumann, Ronald
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Abstract
Pro-inflammatory caspase-1 is a key player in innate immunity. Caspase-1 processes interleukin (IL)-1β and IL-18 to their mature forms and triggers pyroptosis. These caspase-1 functions are linked to its enzymatic activity. However, loss-of-function missense mutations in CASP1 do not prevent autoinflammation in patients, despite decreased IL-1β production. In vitro data suggest that enzymatically inactive caspase-1 drives inflammation via enhanced nuclear factor κB (NF-κB) activation, independent of IL-1β processing. Here, we report two mouse models of enzymatically inactive caspase-1-C284A, demonstrating the relevance of this pathway in vivo. In contrast to Casp1-/- mice, caspase-1-C284A mice show pronounced hypothermia and increased levels of the pro-inflammatory cytokines tumor necrosis factor alpha (TNF-α) and IL-6 when challenged with lipopolysaccharide (LPS). Caspase-1-C284A signaling is RIP2 dependent and mediated by TNF-α but independent of the NLRP3 inflammasome. LPS-stimulated whole blood from patients carrying loss-of-function missense mutations in CASP1 secretes higher amounts of TNF-α. Taken together, these results reveal non-canonical caspase-1 signaling in vivo.
Citation
Cell Rep. 2020 Feb 25;30(8):2501-2511.e5. doi: 10.1016/j.celrep.2020.01.090.
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en
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2211-1247
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Attribution-NonCommercial-ShareAlike 4.0 International