Related Experiment Videos
Physical and functional association between thymic shared antigen-1/stem cell antigen-2 and the T cell receptor
1School of Allied Health Sciences, Faculty of Medicine, Osaka University, Osaka 565, Japan. kosugi@sahs.med.osaka-u.ac.jp
The Journal of Biological Chemistry
|June 20, 1998
Summary
Thymic shared antigen-1 (TSA-1)/stem cell antigen-2 (Sca-2) physically associates with CD3zeta chains, revealing a molecular mechanism for its regulation of T cell receptor signaling and activation.
Area of Science:
- Immunology
- Molecular Biology
- Cell Signaling
Background:
- Thymic shared antigen-1 (TSA-1)/stem cell antigen-2 (Sca-2) is a GPI-anchored antigen on lymphocytes.
- TSA-1/Sca-2 signaling inhibits T cell receptor (TCR)-mediated T cell activation and apoptosis.
Purpose of the Study:
- To elucidate the molecular mechanism of TSA-1-mediated modulation of TCR signaling.
- To investigate the physical association between TSA-1 and the TCR signaling complex.
Main Methods:
- Immunoprecipitation and confocal microscopy to confirm physical association.
- Analysis of TSA-1 and CD3zeta interactions in various cell types, including transfectants.
- Assessment of tyrosine phosphorylation of CD3zeta chains upon anti-TSA-1 stimulation.
Main Results:
- TSA-1 was found to be physically associated with CD3zeta chains on the T cell surface.
- This association does not require the GPI anchor of TSA-1.
- Stimulation with anti-TSA-1 induced tyrosine phosphorylation of CD3zeta, indicating functional association.
Conclusions:
- The physical association of TSA-1/Sca-2 with CD3zeta is a key molecular mechanism underlying its regulatory role in TCR signaling.
- This interaction provides insight into how TSA-1 modulates T cell activation and apoptosis.