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Subpopulations of CD4-, CD8- thymocytes
W C Gause1, J D Mountz, A D Steinberg
1Cellular Immunology Section, National Institute of Arthritis, Musculoskeletal and Skin Diseases, Bethesda, MD 20892.
European Journal of Immunology
|September 1, 1987
Summary
Researchers identified new CD4-, CD8- thymocyte subpopulations using flow cytometry and gene expression analysis. These double-negative cells show distinct surface markers, suggesting further developmental stages or lineages within the thymus.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Thymocytes, immature T cells, undergo complex development in the thymus.
- CD4-, CD8- thymocytes represent an early developmental stage.
- Further characterization of thymocyte subpopulations is crucial for understanding T cell maturation.
Purpose of the Study:
- To further elucidate thymocyte subpopulations within the CD4-, CD8- (double-negative) population.
- To identify novel markers and potential subdivisions of double-negative thymocytes.
- To investigate the relationship of these subpopulations to known cell surface markers.
Main Methods:
- Analysis of highly purified CD4-, CD8- thymocytes.
- Flow microfluorometry (FACS) for cell surface marker expression.
- In situ hybridization for gene expression analysis (c-myb, T cell gamma genes).
Main Results:
- Double-negative thymocytes showed increased expression of c-myb and T cell gamma genes.
- Subpopulations identified: 27% Ly-24+, 8% Ly-6C+, 6% 6B2+.
- All Ly-6C+ cells were Ly-24+; 6% of double-negative thymocytes expressed T cell receptor (F23.1), Ly-1+, and half were Ly-24+.
Conclusions:
- CD4-, CD8- thymocytes comprise further subdivisions based on cell surface markers.
- These markers (Ly-24, Ly-6C, 6B2) are typically found on bone marrow cells and non-T cell progeny.
- These findings suggest distinct activation-maturation stages or different cell lineages within the double-negative thymocyte pool.