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Modulatory effect of aggregating the CD3 molecular complex on T cell activation
H Gur1, M C Wacholtz, L S Davis
1Harold C. Simmons Arthritis Research Center, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas 75235.
Cellular Immunology
|March 1, 1992
Summary
T cell activation requires T cell receptor/CD3 complex aggregation. Excessive cross-linking inhibits Interleukin-2 (IL-2) production, impacting T cell signaling and gene transcription.
Area of Science:
- Immunology
- Molecular Biology
Background:
- T cell activation is crucial for adaptive immunity.
- The T cell receptor (TCR)/CD3 complex plays a central role in initiating T cell responses.
- Understanding the precise role of TCR/CD3 complex cross-linking is vital for immune modulation.
Purpose of the Study:
- To investigate how cross-linking of the TCR/CD3 complex influences T cell activation, specifically Interleukin-2 (IL-2) production.
- To differentiate the effects of soluble versus immobilized cross-linking agents on T cell signaling.
- To explore the impact of varying degrees of cross-linking on IL-2 gene expression and T cell responsiveness.
Main Methods:
- Utilized human peripheral blood T cells and the Jurkat T cell line.
- Induced T cell activation using anti-CD3 monoclonal antibodies (mAbs) and phorbol myristate acetate (PMA).
- Employed soluble and immobilized goat anti-mouse immunoglobulin (GaMIg) for cross-linking, and F(ab) fragments to modulate cross-linking extent.
Main Results:
- Soluble GaMIg markedly inhibited IL-2 production by cross-linking anti-CD3 mAbs, linked to diminished IL-2 mRNA accumulation.
- Immobilized GaMIg potently stimulated IL-2 production.
- Cross-linking anti-CD3 with soluble GaMIg enhanced aggregation but did not alter intracellular calcium changes; excessive cross-linking suppressed responses.
Conclusions:
- TCR/CD3 complex aggregation is necessary for IL-2 production induction.
- Excessive cross-linking of the TCR/CD3 complex diminishes IL-2 production.
- Cross-linking differentially affects TCR/CD3 complex aggregation, signaling, and IL-2 gene transcription, highlighting complex regulatory mechanisms.