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10:29
Generation of Human Chimeric Antigen Receptor Regulatory T Cells
Published on: January 3, 2025
Cyclic AMP underpins suppression by regulatory T cells.
Josef Bodor1, Tobias Bopp, Martin Vaeth
1Department of Molecular Pathology, Institute of Pathology, University of Würzburg, Würzburg, Germany. bodor@uni-mainz.de
European Journal of Immunology
|June 9, 2012
Summary
Naturally occurring T regulatory (nTreg) cells use cyclic adenosine monophosphate (cAMP) to suppress immune responses. This review explores how cAMP transfer and its downstream effects, like ICER and CTLA-4 modulation, mediate nTreg cell suppression.
Area of Science:
- Immunology
- Cellular Biology
- Molecular Biology
Background:
- Naturally occurring T regulatory (nTreg) cells are crucial for immune system regulation.
- Intracellular cyclic adenosine monophosphate (cAMP) levels are elevated in nTreg cells and mediate their suppressive functions.
- nTreg cell-mediated suppression involves the transfer of cAMP to target cells.
Purpose of the Study:
- To review the molecular mechanisms by which cAMP mediates nTreg cell suppression.
- To elucidate the role of inducible cAMP early repressor (ICER) in cAMP-driven suppression.
- To discuss the modulation of CTLA-4 and its ligands by cAMP in nTreg cell function.
Main Methods:
- This review synthesizes existing research on nTreg cell function and cAMP signaling.
- Analysis of molecular pathways involving cAMP, ICER, NFAT, and CTLA-4.
- Examination of intercellular communication via gap junctions for cAMP transfer.
Main Results:
- cAMP transfer via gap junctions suppresses CD4(+) T cell and antigen-presenting cell (APC) function.
- cAMP facilitates ICER expression, inhibiting interleukin-2 (IL-2) transcription.
- ICER also inhibits NFATc1/α transcription and complexes with NFATc1/c2, further suppressing NFAT-driven transcription.
- cAMP modulates CTLA-4 and B7 ligand expression, fine-tuning immune suppression.
Conclusions:
- cAMP is a central mediator of nTreg cell suppressive functions.
- The ICER pathway is a key mechanism for cAMP-induced suppression of T cell activation.
- Modulation of CTLA-4/B7 interactions by cAMP adds another layer to nTreg cell-mediated immune regulation.
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