A revised model of TRAIL-R2 DISC assembly explains how FLIP(L) can inhibit or promote apoptosis.
EMBO Rep
; 21(3): e49254, 2020 03 04.
Article
en En
| MEDLINE
| ID: mdl-32009295
ABSTRACT
The long FLIP splice form FLIP(L) can act as both an inhibitor and promoter of caspase-8 at death-inducing signalling complexes (DISCs) formed by death receptors such as TRAIL-R2 and related intracellular complexes such as the ripoptosome. Herein, we describe a revised DISC assembly model that explains how FLIP(L) can have these opposite effects by defining the stoichiometry (with respect to caspase-8) at which it converts from being anti- to pro-apoptotic at the DISC. We also show that in the complete absence of FLIP(L), procaspase-8 activation at the TRAIL-R2 DISC has significantly slower kinetics, although ultimately the extent of apoptosis is significantly greater. This revised model of DISC assembly also explains why FLIP's recruitment to the TRAIL-R2 DISC is impaired in the absence of caspase-8 despite showing that it can interact with the DISC adaptor protein FADD and why the short FLIP splice form FLIP(S) is the more potent inhibitor of DISC-mediated apoptosis.
Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Apoptosis
/
Proteína Reguladora de Apoptosis Similar a CASP8 y FADD
Tipo de estudio:
Prognostic_studies
Límite:
Humans
Idioma:
En
Año:
2020
Tipo del documento:
Article