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Cell death: TRAIL and its receptors
1Centre d'Immunologie INSERM-CNRS de Marseille-Luminy, Case 906, 13288 Marseille Cedex 9, France.
Current Biology : CB
|February 21, 1998
Summary
A novel cell-death pathway involves Tumor Necrosis Factor-Related Apoptosis-Inducing Ligand (TRAIL) and its receptors. Some receptors trigger cell death, while others unexpectedly block this signal, revealing a new regulatory mechanism.
Area of Science:
- Cell biology
- Molecular signaling
- Apoptosis research
Background:
- The Tumor Necrosis Factor-Related Apoptosis-Inducing Ligand (TRAIL) pathway regulates programmed cell death.
- TRAIL interacts with specific cell-surface receptors to initiate signaling cascades.
Purpose of the Study:
- To elucidate the complete mechanism of TRAIL-mediated cell-death signaling.
- To identify and characterize the roles of all TRAIL-specific receptors in signal transduction.
Main Methods:
- Analysis of TRAIL receptor interactions.
- Investigation of downstream signaling events following TRAIL stimulation.
- Functional assays to determine receptor-mediated effects on cell viability.
Main Results:
- Identified two distinct types of TRAIL receptors.
- Demonstrated that two receptors specifically transduce the cell-death signal.
- Discovered two additional receptors that act as a control mechanism, preventing signal transduction.
Conclusions:
- The TRAIL-mediated cell-death system involves a balance between death-inducing and death-inhibiting receptors.
- A previously unrecognized regulatory mechanism exists within the TRAIL signaling pathway.