Related Experiment Videos
Characterization of two receptors for TRAIL
P Schneider1, J L Bodmer, M Thome
1Institute of Biochemistry, University of Lausanne, Epalinges, Switzerland.
FEBS Letters
|December 31, 1997
Summary
Two new tumor necrosis factor receptor family members, TRAIL-R2 and TRAIL-R3, were identified. TRAIL-R2 induces apoptosis, while TRAIL-R3 does not, indicating complex regulation of TRAIL signaling pathways.
Area of Science:
- Molecular Biology
- Immunology
Background:
- The tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) pathway plays a critical role in apoptosis and immune regulation.
- Identification and characterization of TRAIL receptors are crucial for understanding TRAIL-mediated cellular responses.
Purpose of the Study:
- To identify and characterize novel receptors for TRAIL.
- To elucidate the functional differences and expression patterns of these newly identified TRAIL receptors.
Main Methods:
- Receptor identification and cloning.
- Analysis of receptor structure and function (apoptosis induction assays).
- Investigation of receptor tissue distribution and binding affinities.
Main Results:
- Two TRAIL receptors, TRAIL-R2 and TRAIL-R3, were identified as members of the tumor necrosis factor receptor family.
- TRAIL-R2, similar to TRAIL-R1 (DR-4), can induce apoptosis, while TRAIL-R3 does not promote cell death.
- TRAIL-R3 is highly glycosylated, membrane-bound via a phosphatidylinositol anchor, and characterized by TAPE repeats; it is expressed in PBLs and skeletal muscle, unlike the broadly distributed TRAIL-R2.
- All three TRAIL receptors bind TRAIL with comparable affinity.
Conclusions:
- TRAIL-R2 and TRAIL-R3 represent distinct TRAIL receptors with differential functions in apoptosis.
- The unique structural features and restricted expression of TRAIL-R3 suggest specialized roles.
- Similar binding affinities of all TRAIL receptors to TRAIL imply intricate regulatory mechanisms governing TRAIL signaling outcomes.