Identification of DELE, a novel DAP3-binding protein which is crucial for death receptor-mediated apoptosis induction
Copyright policy )Identification of DELE, a novel DAP3-binding protein which is crucial for death receptor-mediated apoptosis induction
Death associated protein 3 (DAP3) is known to be a highly conserved protein, and is responsible for regulating apoptosis induced by various stimuli. To understand the molecular mechanism of how DAP3 induces apoptosis, we performed yeast two-hybrid screening, and identified a novel DAP3-binding protein termed death ligand signal enhancer (DELE). In this report, we show that DELE actually binds to DAP3 in mammalian cells. We found that the cells stably expressing DELE are susceptible to apoptosis induction by the stimulation of TNF-α and TRAIL. In addition, knockdown of DELE expression rescued the HeLa cells from apoptosis induction by these stimuli. Moreover, activation of caspase-3, caspase-8 and caspase-9 induced by stimulation of TNF-α, anti-Fas or TRAIL was significantly inhibited by the knockdown of DELE expression. These results demonstrated the biological significance of DELE for apoptosis signal mediated by death receptors.
- Hokkaido University Japan
- Hokkaido Bunkyo University Japan
Ribosomal Proteins, Caspase 8, Caspase 3, Tumor Necrosis Factor-alpha, Gene Expression, Proteins, RNA-Binding Proteins, Apoptosis, Receptors, Death Domain, Caspase 9, Cell Line, Mitochondria, Mitochondrial Proteins, TNF-Related Apoptosis-Inducing Ligand, Gene Knockdown Techniques, Humans, RNA, Small Interfering, Apoptosis Regulatory Proteins, HeLa Cells, Signal Transduction
Ribosomal Proteins, Caspase 8, Caspase 3, Tumor Necrosis Factor-alpha, Gene Expression, Proteins, RNA-Binding Proteins, Apoptosis, Receptors, Death Domain, Caspase 9, Cell Line, Mitochondria, Mitochondrial Proteins, TNF-Related Apoptosis-Inducing Ligand, Gene Knockdown Techniques, Humans, RNA, Small Interfering, Apoptosis Regulatory Proteins, HeLa Cells, Signal Transduction
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