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Generation of Induced Regulatory T Cells from Primary Human Naïve and Memory T Cells
Published on: April 16, 2012
Human peripheral gammadelta T cells possess regulatory potential.
Anja A Kühl1, Nina N Pawlowski, Katja Grollich
1Medizinische Klinik I, Charité - Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm, Berlin, Germany.
Immunology
|October 8, 2009
Summary
Human gammadelta T cells, crucial for immune regulation, exhibit potent T helper cell suppression in vitro. Their strong secretion of transforming growth factor-beta (TGF-beta), especially by the Vdelta1 subset, underlies this regulatory capacity.
Area of Science:
- Immunology
- Cell Biology
Background:
- Animal models suggest gammadelta T cells possess regulatory properties, as their deficiency exacerbates colitis.
- Understanding the in vitro functions of human gammadelta T cells is essential for elucidating their role in immune homeostasis.
Purpose of the Study:
- To investigate the proliferation, suppression, and cytokine secretion of human peripheral gammadelta T cells in vitro.
- To compare the regulatory potential of gammadelta T cells with CD4(+) CD25(+) T cells.
Main Methods:
- Isolation of human peripheral gammadelta T cells using magnetic antibody cell sorting.
- Assessment of proliferation via (3)[H]thymidine incorporation and cytokine levels (IFN-gamma, IL-2, TGF-beta, IL-10) using ELISA.
- Flow cytometry analysis for latency associated peptide (LAP) expression, intracellular cytokine content, and T helper cell proliferation.
Main Results:
- Human gammadelta T cells demonstrated limited proliferation but potent suppression of T helper cell growth, exceeding that of CD4(+) CD25(+) T cells.
- These cells secreted high levels of IFN-gamma, IL-10, and TGF-beta, with minimal IL-2 production.
- The Vdelta1 subset was identified as the primary producer of TGF-beta compared to the Vdelta2 subset.
Conclusions:
- Peripheral gammadelta T cells possess significant in vitro regulatory potential, particularly in suppressing T helper cell proliferation.
- This potent suppressive activity is attributed to substantial TGF-beta secretion, predominantly from the Vdelta1 subset.
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