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Phosphorylation of CD4 and CD8 molecules following T cell triggering
M L Blue1, D A Hafler, K A Craig
1Dana-Farber Cancer Institute, Department of Medicine, Harvard Medical School, Boston, MA.
Journal of Immunology (Baltimore, Md. : 1950)
|December 15, 1987
Summary
CD4 and CD8 molecules, crucial for T cell activation, undergo phosphorylation upon stimulation via CD3 or CD2 pathways. This suggests a shared signaling mechanism in T cell triggering.
Area of Science:
- Immunology
- Molecular Biology
- Cell Signaling
Background:
- CD4 and CD8 molecules play key roles in T cell activation.
- The precise molecular mechanisms regulating T cell signaling are under investigation.
Purpose of the Study:
- To investigate the role of CD4 and CD8 phosphorylation in T cell activation.
- To explore how different receptor pathways converge to modify CD4 and CD8 molecules.
Main Methods:
- T cell clones and thymocytes were stimulated using phorbol-12-myristate-13-acetate (PMA).
- T cells were activated via the CD3-T cell receptor complex.
- T cell activation was also induced through the CD2 pathway using specific antibodies.
Main Results:
- Exposure to PMA or triggering via the CD3-T cell receptor complex increased CD4 and CD8 phosphorylation.
- Activation through the CD2 pathway also resulted in CD4 and CD8 phosphorylation.
- Phosphorylation of CD4 and CD8 was observed in thymocytes upon PMA treatment or CD2 pathway activation.
Conclusions:
- Signals from distinct receptor pathways (CD3/TCR and CD2) converge to induce CD4 and CD8 phosphorylation.
- CD4 and CD8 phosphorylation appears to be a common consequence of T cell triggering.
- These findings suggest CD4 and CD8 phosphorylation is a significant molecular signaling mechanism in T cell activation.