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Stimulation through the TCR/CD3 complex up-regulates the CD2 surface expression on human T lymphocytes
J Alberola-Ila1, L Places, O de la Calle
1Servei d'Immunologia, Hospital Clinic i Provincial de Barcelona, Spain.
Journal of Immunology (Baltimore, Md. : 1950)
|February 15, 1991
Summary
Stimulating the CD3 complex on human peripheral blood mononuclear cells (PBMC) leads to increased CD2 surface expression. This CD2 up-regulation requires new protein and RNA synthesis, involving protein kinase C and IL-2 pathways during T cell activation.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- The relationship between CD2 and CD3 signaling is known, but CD2 regulation by TCR/CD3 triggering is unclear.
- Understanding T cell activation pathways is crucial for immunology.
Purpose of the Study:
- To investigate if CD2 surface expression is regulated by triggering the TCR/CD3 complex.
- To elucidate the molecular mechanisms underlying CD2 up-regulation.
Main Methods:
- Human peripheral blood mononuclear cells (PBMC) were stimulated with anti-CD3 monoclonal antibodies (mAbs).
- Immunofluorescence and immunoprecipitation assays assessed CD2 surface antigen expression.
- Impact of inhibitors (cycloheximide, actinomycin D, staurosporine) and cytokines (IL-2) on CD2 expression was evaluated.
Main Results:
- CD3 mAb stimulation resulted in CD2 surface antigen hyperexpression.
- This up-regulation required de novo protein and RNA synthesis, with increased CD2 RNA levels observed.
- CD2 up-regulation correlated with other activation markers (CD25, CD71) and involved protein kinase C and IL-2 pathways.
Conclusions:
- TCR/CD3 complex engagement triggers CD2 up-regulation on T cells.
- This process involves new gene transcription and protein synthesis.
- CD2 up-regulation is a significant event in physiological T cell activation.