Compartmentalization of TNF Receptor 1 Signaling: Internalized TNF Receptosomes as Death Signaling Vesicles

作者: Wulf Schneider-Brachert , Vladimir Tchikov , Jens Neumeyer , Marten Jakob , Supandi Winoto-Morbach

DOI: 10.1016/J.IMMUNI.2004.08.017

关键词: EndocytosisSignal transductionEndosomeFADDTumor Necrosis Factor Decoy ReceptorsEndocytic vesicleInternalizationBiologyCell biologyTRADD

摘要: The molecular regulation of the recruitment initial signaling complexes at TNF-R1 is poorly defined. We demonstrate here that within minutes internalized (TNF receptosomes) recruits TRADD, FADD, and caspase-8 to establish "death-inducing complex" (DISC). In addition, we identified internalization domain (TRID) required for receptor endocytosis provide evidence internalization, DISC formation, apoptosis are inseparable events. Analyzing cell lines expressing an internalization-deficient (TNF-R1 DeltaTRID) revealed RIP-1 TRAF-2 occurred level plasma membrane. contrast, aggregation TNF-R1-associated critically dependent on endocytosis. Furthermore, fusion TNF receptosomes with trans-Golgi vesicles results in activation acid sphingomyelinase cathepsin D. Thus, different pathways by compartmentalization membrane-derived endocytic harboring DISC.

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