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Updated: Aug 8, 2026
Generation of Induced Regulatory T Cells from Primary Human Naïve and Memory T Cells
Published on: April 16, 2012
Human CD4+CD25+ regulatory cells have marked and sustained effects on CD8+ T cell activation
Niels Olsen Saraiva Câmara1, Fabien Sebille, Robert I Lechler
1Department of Immunology, Division of Medicine, Imperial College London, Hammersmith Hospital, London, GB.
Insights
Human CD4(+)CD25(+) regulatory T cells significantly inhibit CD8(+) T cell proliferation and function. These regulatory T cells induce sustained hyporesponsiveness in CD8(+) T cells, impacting immune responses.
Area of Science:
- Immunology
- Cell Biology
Background:
- CD4(+)CD25(+) T cells are regulatory cells crucial for preventing autoimmunity and maintaining transplant tolerance.
- Understanding their interaction with CD8(+) T cells is vital for immune regulation.
Purpose of the Study:
- To investigate the regulatory capacity of human CD4(+)CD25(+) T cells on human CD8(+) T cells.
- To analyze the behavior of CD8(+) T cells activated in the presence of CD4(+)CD25(+) T cells.
Main Methods:
- Co-culture experiments involving human CD4(+)CD25(+) and CD8(+) T cells.
- Assessment of CD8(+) T cell proliferation, cytokine production (perforin, granzyme B, IFN-gamma), cytotoxicity, and response to IL-2.
Main Results:
- CD4(+)CD25(+) T cells markedly inhibited CD8(+) T cell proliferation against polyclonal and allogeneic stimuli.
- Regulation was cell contact-dependent, suppressing key cytotoxic molecules and impairing cytotoxicity.
- Regulated CD8(+) T cells exhibited prolonged hyporesponsiveness and refractoriness to IL-2.
Conclusions:
- Human CD4(+)CD25(+) T cells exert profound, sustained inhibition on CD8(+) T cell functions.
- These findings offer insights for optimizing vaccination strategies against tumors and viral infections.
Abstract:
Amongst the many types of regulatory cells that have been described during the past few years, the spontaneously occurring population that is characterized by co-expression of CD4 and CD25 appears to play a key role in the prevention of autoimmunity and the maintenance of transplantation tolerance. In this study we have examined the ability of CD4(+)CD25(+) T cells to regulate human CD8(+) T cells, and the behavior of CD8(+) T cells following activation in the presence of regulatory CD4(+)CD25(+) T cells. The experiments described here demonstrate that human CD4(+)CD25(+) T cells cause pronounced and sustained inhibition of CD8(+) T cell proliferation in response to polyclonal and allogeneic stimulation. The regulation of CD8(+) T cell activation was cell contact-dependent and included inhibition of perforin, granzyme B and IFN-gamma cytokine production at the transcriptional level and impaired cytotoxicity. The regulated CD8(+) T cell population showed sustained hyporesponsiveness and refractoriness to exogenous IL-2. These data provide insights into the short- and long-term effects of CD4(+)CD25(+) T cells on CD8(+) T cells that could be of considerable value in optimizing vaccination against tumor and viral antigens.
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