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Peripheral selection of the T cell repertoire
1Unité INSERM U-25 CNRS UA-122, Hôpital Necker, Paris, France.
Science (New York, N.Y.)
|March 8, 1991
Summary
Peripheral selection shapes T lymphocytes after thymic selection. This process, dependent on T cell receptor (TCR)-ligand interactions, involves antigen binding, T cell clone expansion, and tolerance induction to peripheral self-antigens.
Area of Science:
- Immunology
- Cell Biology
Background:
- T lymphocytes undergo critical selection processes not only during thymic development but also within the peripheral tissues.
- Understanding peripheral T cell selection is crucial for immune system regulation and tolerance.
Purpose of the Study:
- To investigate the mechanisms and characteristics of peripheral T cell selection.
- To differentiate peripheral selection from thymic selection processes.
Main Methods:
- Analysis of T cell receptor (TCR)-ligand interactions in the periphery.
- Assessment of antigen binding requirements for peripheral T cell selection.
- Evaluation of T cell clone expansion and tolerance induction mechanisms.
Main Results:
- Peripheral T cell selection is dependent on TCR-ligand interactions.
- Unlike thymic selection, peripheral selection requires antigen binding to the TCR and induces T cell clone expansion.
- Tolerance to peripheral self-antigens is achieved through elimination of self-reactive T cells and clonal anergy, associated with reduced TCR and CD8 expression.
Conclusions:
- Peripheral selection represents a distinct mechanism from thymic selection, actively shaping the T cell repertoire post-thymic egress.
- Antigen-driven T cell expansion and tolerance induction are key features of peripheral selection, ensuring immune homeostasis.