부산대학교 도서관

Mitochondrial outer membrane permeabilisation (MOMP) is often essential for apoptosis, by enabling cytochrome c release that leads to caspase activation and rapid cell death. Recently, MOMP has been shown to be inherently pro-inflammatory with emerging cellular roles, including its ability to elicit anti-tumour immunity. Nonetheless, how MOMP triggers inflammation and how the cell regulates this remains poorly defined. We find that upon MOMP, many proteins localised either to inner or outer mitochondrial membranes are ubiquitylated in a promiscuous manner. This extensive ubiquitylation serves to recruit the essential adaptor molecule NEMO, leading to the activation of pro-inflammatory NF-κB signalling. We show that disruption of mitochondrial outer membrane integrity through different means leads to the engagement of a similar pro-inflammatory signalling platform. Therefore, mitochondrial integrity directly controls inflammation, such that permeabilised mitochondria initiate NF-κB signalling. Synopsis: Apoptotic mitochondrial outer membrane permeabilisation (MOMP) can be pro-inflammatory. This study shows that MOMP triggers extensive ubiquitylation of mitochondrial proteins, serving to recruit the NF-κB adaptor NEMO and activate pro-inflammatory NF-κB signalling. During apoptosis, many outer and inner membrane proteins of permeabilised mitochondria are extensively ubiquitylated. Ubiquitylated mitochondrial membrane proteins recruit the NF-κB adaptor molecule NEMO to mitochondria. Mitochondria-localised NEMO promotes pro-inflammatory NF-κB signalling. Apoptotic permeabilisation activates NF-κB through extensive ubiquitylation of mitochondrial membrane proteins and recruitment of the NF-κB adaptor NEMO. [ABSTRACT FROM AUTHOR]