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Updated: Aug 12, 2026
Generation of Induced Regulatory T Cells from Primary Human Naïve and Memory T Cells
Published on: April 16, 2012
Suppressive properties of human CD4+CD25+ regulatory T cells are dependent on CTLA-4 expression
Brigitte Birebent1, Richard Lorho, Hélène Lechartier
1Laboratoire d'Immunologie (UPRES EA 1257-IFR97), Faculté de Médecine de Rennes1, Rennes, France.
Insights
Researchers identified a novel method to isolate regulatory T cells (Tregs) from human blood. This technique enriches for cells expressing CTLA-4 (cytotoxic T-lymphocyte-associated protein 4), enhancing their regulatory function.
Area of Science:
- Immunology
- Cell Biology
Background:
- Regulatory T cells (Tregs) are crucial for immune homeostasis and are found within the CD4(+)CD25(+) T cell population.
- Existing methods for isolating Tregs may not fully capture cells with optimal regulatory function.
Purpose of the Study:
- To develop an original method for purifying viable human CD4(+)CD25(+)CD152(+) T lymphocytes.
- To characterize the regulatory properties and suppressive activity of these purified cells.
- To elucidate the role of CTLA-4 in Treg function.
Main Methods:
- Developed a novel technique to induce the surface expression of CTLA-4 from intracellular vesicles on human CD4(+) T cells.
- Purified CD4(+)CD25(+)CD152(+) T lymphocytes and CD4(+)CD25(+)CD152(-) T lymphocytes.
- Assessed in vitro regulatory activity and suppressive function of purified T cell populations.
- Analyzed Foxp3 expression and the involvement of CTLA-4 and suppressive cytokines.
Main Results:
- The novel method successfully isolated a smaller, more homogeneous population of CD4(+) T cells enriched in regulatory activity.
- This enriched population exhibited increased Foxp3 expression.
- CD4(+)CD25(+)CD152(+) T lymphocytes demonstrated significantly stronger suppressive activity on the proliferation of alloantigen-specific T cells compared to CD4(+)CD25(+)CD152(-) T cells.
- CTLA-4 was confirmed to be involved in the regulatory activity of these cells, whereas suppressive cytokines were not.
Conclusions:
- A novel method allows for the purification of highly functional regulatory T cells expressing CTLA-4.
- CTLA-4 plays a critical role in the suppressive function of CD4(+)CD25(+)CD152(+) T lymphocytes.
- This purification strategy enriches for potent regulatory T cells for further study and potential therapeutic applications.
Abstract:
It has been demonstrated that T cells with regulatory properties are present within the peripheral blood CD4(+)CD25(+) T cell compartment. Here, we describe an original method to purify human CD4(+)CD25(+)CD152(+) T lymphocytes as living cells by forcing the exportation of CTLA-4 molecules stored in intracellular vesicules at the cell surface. By doing so, we demonstrate that CD4(+)CD25(+) T cells contain a smaller and more homogeneous population enriched in cells with in vitro regulatory activity. Moreover, we show that this enrichment in regulatory T cells is associated with an increased expression of Foxp3 and that CD4(+)CD25(+)CD152(+) T lymphocytes display a much stronger suppressive activity in controlling in vitro proliferation of alloantigen-specific T cells than CD4(+)CD25(+)CD152(-) T lymphocytes purified in parallel. Lastly, by purifying such cells expressing CTLA-4, we demonstrate that indeed CTLA-4 is involved in CD4(+)CD25(+)CD152(+) T cell regulatory activity, while suppressive cytokines are not.
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