Abstract：
:The intracellular regulation of cell death pathways by cIAPs has been enigmatic. Here we show that loss of cIAPs promotes the spontaneous formation of an intracellular platform that activates either apoptosis or necroptosis. This 2 MDa intracellular complex that we designate "Ripoptosome" is necessary but not sufficient for cell death. It contains RIP1, FADD, caspase-8, caspase-10, and caspase inhibitor cFLIP isoforms. cFLIP(L) prevents Ripoptosome formation, whereas, intriguingly, cFLIP(S) promotes Ripoptosome assembly. When cIAPs are absent, caspase activity is the "rheostat" that is controlled by cFLIP isoforms in the Ripoptosome and decides if cell death occurs by RIP3-dependent necroptosis or caspase-dependent apoptosis. RIP1 is the core component of the complex. As exemplified by our studies for TLR3 activation, our data argue that the Ripoptosome critically influences the outcome of membrane-bound receptor triggering. The differential quality of cell death mediated by the Ripoptosome may cause important pathophysiological consequences during inflammatory responses.
journal_name
Mol Celljournal_title
Molecular cellauthors
Feoktistova M,Geserick P,Kellert B,Dimitrova DP,Langlais C,Hupe M,Cain K,MacFarlane M,Häcker G,Leverkus Mdoi
10.1016/j.molcel.2011.06.011subject
Has Abstractpub_date
2011-08-05 00:00:00pages
449-63issue
3eissn
1097-2765issn
1097-4164pii
S1097-2765(11)00452-7journal_volume
43pub_type
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