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TRAIL-R2: a novel apoptosis-mediating receptor for TRAIL
H Walczak1, M A Degli-Esposti, R S Johnson
1Immunex Corporation, 51 University Street, Seattle, WA 98101, USA.
The EMBO Journal
|October 6, 1997
Summary
Researchers identified a second receptor for Tumor Necrosis Factor-Related Apoptosis-Inducing Ligand (TRAIL), named TRAIL-R2. This discovery reveals a more complex biological pathway for TRAIL-mediated apoptosis.
Area of Science:
- Molecular Biology
- Immunology
- Cell Biology
Background:
- Tumor Necrosis Factor-Related Apoptosis-Inducing Ligand (TRAIL) is a cytokine that induces apoptosis.
- A previously identified receptor for TRAIL is DR4 (TRAIL-R1).
- The cellular mechanisms of TRAIL-induced apoptosis require further elucidation.
Purpose of the Study:
- To identify and characterize novel receptors for TRAIL.
- To investigate the role of these receptors in TRAIL-mediated apoptosis.
- To understand the complexity of TRAIL signaling pathways.
Main Methods:
- Ligand-based affinity purification to isolate TRAIL receptors.
- Molecular cloning to identify the genetic sequence of the receptor.
- Expression analysis of TRAIL-R2 mRNA and gene localization.
Main Results:
- Identification of a distinct TRAIL receptor, TRAIL-R2, on human cell lines.
- TRAIL-R2 possesses structural features of TNF receptor family members and a death domain.
- TRAIL-R2 mediates apoptosis via FADD/MORT1, distinct from TRAIL-R1's pathway.
Conclusions:
- The existence of TRAIL-R2 alongside TRAIL-R1 indicates a complex TRAIL signaling network.
- TRAIL-R2 plays a significant role in mediating TRAIL-induced apoptosis.
- This finding expands our understanding of TNF superfamily signaling and apoptosis regulation.