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Intraembryonic haemopoietic cells and early T cell development
M Lampisuo1, J Karvinen, T Petteri Arstila
1Department of Medical Microbiology, Turku University, Finland.
Scandinavian Journal of Immunology
|January 1, 1995
Summary
Avian T cell precursors in chick embryos were identified in the para-aortic region before thymic colonization. These cells, marked by Ov antigen, show potential for hematopoietic and endothelial differentiation, indicating early lineage heterogeneity.
Area of Science:
- Developmental immunology
- Avian embryology
- Hematopoiesis
Background:
- T cell precursors in chick embryos are found in the intraembryonic mesenchyme and para-aortic region before thymic colonization.
- The cell surface markers and lineage commitment of these avian prethymic stem cells are currently unknown.
Purpose of the Study:
- To identify cell surface markers of avian prethymic stem cells.
- To investigate the lineage commitment of these precursor cells before thymic colonization.
Main Methods:
- Immunohistochemical analysis of 7-day-old chick embryos.
- Flow cytometry analysis of intraembryonic mesenchyme precursors.
Main Results:
- Ov+ cells and embryonic dorsal aorta endothelial cells were identified in the para-aortic region.
- Ov antigen may mark primitive precursor cells with hematopoietic and endothelial potential.
- CD45+ and CD8 alpha+ hematopoietic cells were detected before thymic colonization.
- Flow cytometry revealed distinct subsets of Ov, CD45, and CD8 alpha expressing cells, suggesting precursor heterogeneity.
Conclusions:
- Avian T cell precursors exhibit heterogeneity before thymic colonization.
- Ov antigen represents a potential marker for primitive hematopoietic and endothelial precursor cells.