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. 2024 Sep 16;25(10):4153–4167. doi: 10.1038/s44319-024-00260-0

Figure 2. Signaling events downstream of extra centrosomes.

Figure 2

(A) Cycling cells typically contain a pair of centrioles, consisting of one daughter and one mature parent centriole decorated with distal appendages (indicated in red). The presence of extra mature centrioles leads to PIDD1 recruitment via ANKRD26 and its activation. The oligomerization of PIDD1, RAIDD and caspase-2 facilitates PIDDosome assembly and activates caspase-2. Caspase-2 cleaves either pro-apoptotic protein BID or MDM2 causing P53 stabilization and subsequent cell cycle arrest or apoptotic cell death. (B) Deubiquitination of PLK4 facilitates phosphorylation of NEK7, which in turn reduces NEK7-NLRP3 inflammasome interaction. NLRP3 release promotes oligomerization of NLRP3, ASC, and pro-caspase-1 into an active NLRP3 inflammasome. The inflammasome activates caspase-1, which in turn cleaves prointerleukin-1β (IL-1β) into its active form causing inflammation. Additionally, Gasdermin D (GSDMD) is cleaved by caspase-1 and forms a transmembrane pore leading to pyroptotic cell death.