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CD4+CD8+CD3high thymocytes appear transiently during ontogeny: evidence from phenotypic and functional studies
P Hugo1, R L Boyd, G A Waanders
1Department of Pathology and Immunology, Monash Medical School, Parkville.
European Journal of Immunology
|November 1, 1991
Summary
This study identifies CD4+CD8+CD3high thymocytes as a crucial intermediate stage in T cell development. These cells appear after CD4+CD8+CD3low thymocytes and before mature T cells, showing unique cortisone resistance and calcium signaling patterns.
Area of Science:
- Immunology
- Developmental Biology
- Cell Biology
Background:
- T cell development in the thymus involves distinct maturational stages.
- Thymocyte subsets emerge in a specific, ordered sequence.
Purpose of the Study:
- To determine the precise timing of CD4+CD8+CD3high thymocyte appearance during T cell development.
- To investigate the precursor-progeny relationship between thymocyte subsets.
Main Methods:
- In vivo and in vitro embryonic development models.
- Thymic reconstitution after cortisone treatment.
- Analysis of antigen receptor-mediated calcium influx.
Main Results:
- CD4+CD8+CD3high thymocytes emerged after CD4+CD8+CD3low cells and before mature thymocytes.
- Cortisone resistance was first observed in CD4+CD8+CD3high cells.
- These cells exhibited intermediate calcium influx patterns.
Conclusions:
- Results support a precursor-progeny relationship between CD4+CD8+CD3low and CD4+CD8+CD3high thymocytes.
- CD4+CD8+CD3high thymocytes represent a key transitional stage toward mature T cells.