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Updated: Apr 23, 2026

Generation of Induced Regulatory T Cells from Primary Human Naïve and Memory T Cells
Published on: April 16, 2012
CTLA4-Ig preserves thymus-derived T regulatory cells
Sarah M Ahmadi1, Markus A Hölzl, Edda Mayer
11 Division Transplantation Immunology, Children's Cancer Research Institute, Vienna, Austria. 2 Division of Transplantation, Department of Surgery, Medical University Vienna, Austria. 3 Address correspondence to: Sarah Ahmadi, M.Sc., Children's Cancer Research Institute, Zimmermannplatz 10, A-1090 Vienna, Austria.
Cytotoxic T-lymphocyte-associated protein 4 immunoglobulin fusion proteins (CTLA4-Ig) do not impair regulatory T (Treg) cell function. This study shows CTLA4-Ig increases Treg cell frequency and maintains their suppressive activity in vitro.
Area of Science:
- Immunology
- Immunotherapy
Background:
- CTLA4-Ig therapies target T-cell costimulation for autoimmune diseases.
- Concerns exist regarding CTLA4-Ig's impact on regulatory T (Treg) cell homeostasis and function.
- Potential antitolerogenic effects of CTLA4-Ig require investigation.
Purpose of the Study:
- To investigate the in vitro effects of CTLA4-Ig on Treg cell numbers, frequencies, and function.
- To address concerns about CTLA4-Ig potentially interfering with Treg cell-mediated immune tolerance.
Main Methods:
- Utilized an in vitro murine major histocompatibility complex mismatched model.
- Employed C57BL/6 dendritic cells to stimulate allogeneic Balb/c Foxp3 T cells.
- Analyzed Treg cell frequency, proliferation, and suppressive activity in the presence of CTLA4-Ig.
Main Results:
- CTLA4-Ig dampened global T-cell proliferation but increased the relative frequency of Treg cells.
- Treg cell suppressive activity remained intact.
- CTLA4-Ig selectively inhibited conventional T cells, sparing Treg cell proliferation and decreasing apoptosis.
Conclusions:
- CTLA4-Ig does not negatively impact Treg cell frequencies in vitro.
- CTLA4-Ig maintains Treg cell function, suggesting it is not antitolerogenic.
- Findings support the continued investigation of CTLA4-Ig in immune-related diseases.
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