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Signals involved in CD4/CD8 lineage commitment: current concepts and potential mechanisms.
A Singer1, R Bosselut, A Bhandoola
1Experimental Immunology Branch, National Cancer Institute, National Institutes of Health, Building 10 Room 4B36, Bethesda, Maryland 20892, USA.
Seminars in Immunology
|August 11, 1999
Summary
T cell development requires matching T cell receptor (TCR) and coreceptor specificities, a process called lineage commitment. This review explores current models and experimental evidence for how immature T cells achieve this critical immune function.
Area of Science:
- Immunology
- Cell Biology
- Developmental Biology
Background:
- Mature T cells require specific T cell receptor (TCR) and CD4/CD8 coreceptor matching for immune competence.
- This matching, termed lineage commitment, occurs in the thymus at the CD4(+)8(+) stage.
- The signaling pathways initiating lineage commitment in thymocytes are under active investigation.
Purpose of the Study:
- To review major models of T cell lineage commitment.
- To discuss the experimental evidence supporting these models.
- To provide an overview of the ongoing research in thymocyte development.
Main Methods:
- Literature review of existing research models.
- Analysis of experimental data supporting different hypotheses.
- Synthesis of current understanding of T cell signaling pathways.
Main Results:
- Several models propose mechanisms for TCR and coreceptor specificity matching.
- Experimental data provide insights into the signaling events during lineage commitment.
- The precise signals and pathways remain a focus of ongoing research.
Conclusions:
- Lineage commitment is a complex process essential for T cell function.
- Understanding these developmental pathways is crucial for immunology.
- Further research is needed to fully elucidate the mechanisms of T cell lineage commitment.