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Generation of Human Chimeric Antigen Receptor Regulatory T Cells
Published on: January 3, 2025
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Continuous T cell receptor signals maintain a functional regulatory T cell pool
J Christoph Vahl1, Christoph Drees2, Klaus Heger3
1Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152 Martinsried, Germany.
Immunity
|December 4, 2014
Summary
Regulatory T (Treg) cells require continuous self-reactive T cell receptor (TCR) signals for homeostasis and function. Ablating TCRs in mature Treg cells revealed these signals are crucial, despite not affecting Foxp3 expression.
Area of Science:
- Immunology
- Cell Biology
- Autoimmunity
Background:
- Regulatory T (Treg) cells are crucial for maintaining immune homeostasis and preventing autoimmune diseases.
- Mature Treg cells in the periphery may continuously receive self-reactive T cell receptor (TCR) signals, but their importance is unclear.
Purpose of the Study:
- To investigate the role of inherent autoreactivity, mediated by the TCR, in the biology of mature Treg cells.
- To determine if continuous TCR signaling is essential for Treg cell homeostasis, gene expression, and suppressive function.
Main Methods:
- Genetic ablation of the T cell receptor (TCR) in mature Treg cells in vivo.
- Analysis of Foxp3 expression, gene hypomethylation, Treg cell homeostasis, gene expression, and suppressive function.
Main Results:
- TCR-induced Treg lineage-defining Foxp3 expression and gene hypomethylation were uncoupled from TCR input in mature Treg cells.
- Continuous TCR triggering was found to be critical for Treg cell homeostasis, cell-type-specific gene expression, and suppressive function.
Conclusions:
- Continuous TCR signaling is essential for maintaining the stability and function of mature Treg cells.
- While not required for initial Treg lineage commitment markers like Foxp3 expression, TCR signaling is vital for ongoing Treg cell biology.
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