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Updated: Jun 30, 2026
12:09
Use of Single Chain MHC Technology to Investigate Co-agonism in Human CD8+ T Cell Activation
Published on: February 28, 2019
Alloantigen-induced regulatory CD8+CD103+ T cells
Sven D Koch1, Elena Uss, René A W van Lier
1Department of Experimental Immunology, Academic Medical Center, Meibergdreef 9, P.O. Box 22660, 1100 DD Amsterdam, The Netherlands. S.D.Koch@amc.uva.nl
Human Immunology
|September 30, 2008
Summary
CD103(+) regulatory T cells (Tregs) are a newly identified CD8(+) T-cell subset crucial for transplant tolerance. These cells suppress immune responses through direct cell-cell contact, offering insights into alloimmune regulation.
Area of Science:
- Immunology
- Transplantation Biology
- Cellular Immunology
Background:
- Regulatory T cells (Tregs) are vital for maintaining immune tolerance after transplantation.
- Both CD4(+) and CD8(+) T cell subsets can function as Tregs.
- CD8(+)CD103(+) T cells represent a recently identified regulatory subset.
Purpose of the Study:
- To review the phenotypic and functional characteristics of CD8(+)CD103(+) Tregs.
- To elucidate the role of CD8(+)CD103(+) Tregs in the alloimmune response in vivo.
- To understand the mechanisms by which CD8(+)CD103(+) Tregs suppress immune cells.
Main Methods:
- Mixed lymphocyte cultures (MLCs) were used to generate CD8(+)CD103(+) Tregs.
- Transforming growth factor-beta (TGF-β) was employed to enhance Treg populations.
- Intracellular cytokine staining and transwell assays were utilized to investigate suppression mechanisms.
Main Results:
- CD8(+)CD103(+) Tregs exhibit an antigen-experienced effector phenotype with limited cytotoxicity and IFN-γ production.
- These Tregs demonstrate reduced proliferation capacity upon restimulation, indicating an anergic state.
- Suppression of alloreactive effector T cells by CD8(+)CD103(+) Tregs is cytokine-independent and requires cell-cell contact.
Conclusions:
- CD8(+)CD103(+) Tregs are a distinct regulatory T cell subset with significant implications for transplant tolerance.
- Myeloid dendritic cells are identified as key inducers of CD103(+) Treg generation.
- The cell-contact-dependent, cytokine-independent suppression mechanism highlights a unique mode of immune regulation by these Tregs.
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