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Updated: Jan 29, 2026
14:29
Examination of Thymic Positive and Negative Selection by Flow Cytometry
Published on: October 8, 2012
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The early proximal αβ TCR signalosome specifies thymic selection outcome through a quantitative protein interaction
Steven C Neier1,2, Alejandro Ferrer1, Katelynn M Wilton1,2,3
1Department of Immunology, Mayo Clinic College of Medicine, Rochester, MN, USA.
Science Immunology
|February 17, 2019
Summary
T cell development relies on quantitative T cell receptor (TCR) signaling. Signal strength, not unique protein interactions, determines T cell selection, with CD3δ boosting signal for maximal T cell generation.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- T cell receptor (TCR) signaling dictates T cell fate during development.
- The mechanisms distinguishing positive and negative selection remain incompletely understood.
- Signal specificity may arise from qualitative, quantitative, or kinetic differences in protein-protein interactions (PPIs).
Purpose of the Study:
- To investigate how early TCR signals discriminate between positive and negative selection.
- To determine the role of CD3δ in TCR-mediated signaling during T cell development.
Main Methods:
- Novel protein-protein interaction (PPI) network analysis.
- Assessment of T cell selection in CD3δ-deficient mice.
- TCR signaling quantification and manipulation.
Main Results:
- Early TCR-proximal signals distinguishing positive and negative selection are primarily quantitative.
- Antigen dose can reprogram a negative selection ligand to induce positive selection.
- CD3δ quantitatively boosts TCR signals, enhancing positive selection efficiency.
Conclusions:
- Thymic selection outcome is determined by a quantitative network signaling mechanism.
- Signal quantity, rather than qualitative differences, is key for early TCR signal discrimination.
- CD3δ plays a quantitative role in maximizing T cell generation during positive selection.
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