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Spatial and Temporal Control of T Cell Activation Using a Photoactivatable Agonist
Published on: April 25, 2018
Dynamic interactions of macrophages with T cells during antigen presentation
D M Underhill1, M Bassetti, A Rudensky
1Department of Immunology, University of Washington, Seattle, Washington 98195, USA.
The Journal of Experimental Medicine
|December 22, 1999
Summary
We developed a real-time method to visualize antigen presentation by antigen-presenting cells (APCs) to T cells. This shows T cells dynamically interact with macrophages, integrating signals from multiple encounters.
Area of Science:
- Immunology
- Cell Biology
- Microscopy
Background:
- Understanding T cell activation requires visualizing interactions with antigen-presenting cells (APCs).
- Existing methods lack real-time, single-cell resolution for productive antigen presentation.
Purpose of the Study:
- To establish a novel method for real-time video analysis of APC-T cell interactions.
- To visualize and quantify productive antigen presentation in single T cells.
Main Methods:
- Developed a reporter system using green fluorescent protein (GFP) under an NFAT-responsive promoter.
- Enabled visualization of T cell activation via video microscopy and flow cytometry.
- Analyzed interactions between macrophages and T cells in real-time.
Main Results:
- Macrophages can simultaneously activate multiple T cells.
- T cell interactions with macrophages are highly dynamic, involving continuous migration.
- T cells integrate signals from serial interactions with APCs during stimulation.
Conclusions:
- The new method provides rapid, semiquantitative analysis of T cell-APC interactions.
- Demonstrates the dynamic nature of T cell activation and signal summation.
- Offers insights into immune synapse formation and T cell response dynamics.
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