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Characterization of Thymic Settling Progenitors in the Mouse Embryo Using In Vivo and In Vitro Assays
Published on: June 9, 2015
Circulating macrophages as well as developing thymocytes are enclosed within thymic nurse cells
M Samms1, M Martinez, S Fousse
1Department of Biology, The City College of New York, 138th Street at Convent Avenue, New York, NY 10031, USA.
Cellular Immunology
|November 22, 2001
Summary
Thymic nurse cells (TNCs) and macrophages interact directly in the thymus, with macrophages entering TNCs to support antigen presentation. This study reveals a novel collaboration between these immune cells in thymocyte selection.
Area of Science:
- Immunology
- Cell Biology
Background:
- Thymic nurse cells (TNCs) and macrophages are known antigen-presenting cells involved in thymocyte selection.
- TNCs internalize viable thymocytes, while macrophages engulf apoptotic ones.
Purpose of the Study:
- To investigate the direct interaction between peripheral macrophages and TNCs in mice.
- To explore the functional relationship between TNCs and macrophages in the thymus.
Main Methods:
- Isolation and examination of freshly isolated TNCs from C57BL/6 mice.
- In vitro co-culture of thymocytes and macrophages with the tsTNC-1 cell line.
- In vivo tracking of fluorescently labeled peritoneal macrophages in the mouse thymus.
Main Results:
- Approximately 1.7% of isolated TNCs contained macrophages within their cytoplasm.
- A total of 4.6% of TNCs showed association with macrophages (internalized or bound).
- In vitro and in vivo experiments confirmed dynamic interactions and thymus infiltration by macrophages.
Conclusions:
- This study provides the first evidence of direct interaction between peripheral macrophages and TNCs.
- TNCs and macrophages collaborate dynamically in the thymus, likely enhancing antigen presentation during thymocyte selection.
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