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Quantitative interplay between activating and pro-apoptotic signals dictates T cell responses
Aoshuang Chen1, Guoxing Zheng, Mark L Tykocinski
1Department of Pathology and Laboratory Medicine, University of Pennsylvania, 6 Gates Building, 3400 Spruce Street, Philadelphia, PA 19104-4283, USA.
Cellular Immunology
|May 16, 2003
Summary
Antigen-presenting cells (APCs) deliver opposing signals to T cells. This study quantifies how the balance between activating and inhibitory signals on APCs dictates T cell response magnitude.
Area of Science:
- Immunology
- Cell Signaling
- Molecular Biology
Background:
- Antigen-presenting cells (APCs) express ligands that can activate or inhibit T cells.
- Understanding how T cells integrate these opposing signals is crucial for immune response regulation.
Purpose of the Study:
- To quantitatively investigate how T cells integrate concurrent activating and inhibitory signals from APCs.
- To determine the balance between costimulatory and pro-apoptotic signals in dictating T cell responses.
Main Methods:
- Utilized protein transfer to quantitatively "paint" Fc fusion proteins (costimulatory and pro-apoptotic) onto surrogate APCs.
- Assessed T cell proliferation in response to these engineered APCs in vitro.
- Analyzed species-specific differences in naive versus memory T cell responses.
Main Results:
- The quantitative ratio of costimulatory ligands (B7-1, 4-1BBL) to FasL on APCs directly correlates with T cell proliferation magnitude.
- A balance exists between T cell receptor (TCR) and FasL signaling, influencing T cell response.
- Naive and memory T cells exhibit distinct responses to Fas-mediated apoptosis and opposing signals.
Conclusions:
- Demonstrates a quantitative interplay between activating and pro-apoptotic signals in dictating T cell response.
- Highlights the importance of signal balance in immune regulation.
- Reveals subset-specific differences in T cell responses to conflicting signals.