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Subcellular compartmentalization of FADD as a new level of regulation in death receptor signaling
Author(s) -
Föger Niko,
BulfonePaus Silvia,
Chan Andrew C.,
Lee KyeongHee
Publication year - 2009
Publication title -
the febs journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 204
eISSN - 1742-4658
pISSN - 1742-464X
DOI - 10.1111/j.1742-4658.2009.07134.x
Subject(s) - fadd , death domain , microbiology and biotechnology , signal transducing adaptor protein , fas receptor , nuclear export signal , cytoplasm , biology , signal transduction , caspase 8 , programmed cell death , caspase , apoptosis , cell nucleus , biochemistry
Fas‐associated protein with death domain (FADD) is an essential adaptor protein in death receptor‐mediated signal transduction. During apoptotic signaling, FADD functions in the cytoplasm, where it couples activated receptors with initiator caspase‐8. However, in resting cells, FADD is predominantly stored in the nucleus. In this study, we examined the modalities of FADD intracellular trafficking. We demonstrate that, upon CD95 activation, FADD redistributes from the nucleus to the cytoplasm. This inducible nuclear–cytoplasmic translocation of FADD is independent of CD95 internalization, formation of the death‐inducing signaling complex, and caspase‐8 activation. In contrast to nuclear export of FADD, its subsequent recruitment and accumulation at endosomes containing internalized CD95 requires a caspase‐8‐dependent feedback loop. These data indicate the existence of differential pathways directing FADD nuclear export and cytoplasmic trafficking, and identify subcellular compartmentalization of FADD as a novel regulatory mechanism in death receptor signaling.

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