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cIAPs Block Ripoptosome Formation, a RIP1/Caspase-8 Containing Intracellular Cell Death Complex Differentially Regulated by cFLIP Isoforms

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Feoktistova, Maria, Geserick, Peter, Kellert, Beate, Dimitrova, Diana Panayotova, Langlais, Claudia, Hupe, Mike, Cain, Kelvin, MacFarlane, Marion, Häcker, Georg, Leverkus, Martin·2011·Molecular Cell
DOI 10.1016/j.molcel.2011.06.011
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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.

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Cited by

Metadata

Authors
Feoktistova, M., Geserick, P., Kellert, B., Dimitrova, D. P., Langlais, C., Hupe, M., Cain, K., MacFarlane, M., Häcker, G., & Leverkus, M.
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2011-08
Volume
43
Issue
3
Pages
449-463
ISSN
1097-2765 (ISSN-L)
DOI
10.1016/j.molcel.2011.06.011
OpenAlex
W2170554156
Cited by
860
References
14
FWCI
31.74
Type
journal article
Language
en
Open access
hybrid
Licence

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