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Updated: Mar 29, 2026
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Measurement of T Cell Alloreactivity Using Imaging Flow Cytometry
Published on: April 19, 2017
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Quantification of CD4(+) T Cell Alloreactivity and Its Control by Regulatory T Cells Using Time-Lapse Microscopy and
S C Juvet1,2, S Sanderson3, J Hester1
1Transplantation Research Immunology Group, Nuffield Department of Surgical Sciences, John Radcliffe Hospital, University of Oxford, Oxford, UK.
Summary
Monitoring prolonged T cell-dendritic cell interactions can predict transplant outcomes. Regulatory T cells reduce these prolonged interactions, offering a potential biomarker for immunosuppression withdrawal strategies.
Area of Science:
- Immunology
- Transplantation Biology
- Cellular Immunology
Background:
- Current assays for selecting transplant recipients for immunosuppression withdrawal have limited success.
- Existing methods may fail to capture early T cell-alloantigen interactions crucial for transplant outcomes.
Purpose of the Study:
- To investigate if prolonged CD4(+) T cell interactions with donor dendritic cells correlate with transplant outcomes.
- To define and quantify immunologically relevant T cell-dendritic cell contacts.
- To assess the role of regulatory T cells in modulating these interactions.
Main Methods:
- Utilized in vitro time-lapse microscopy in a mouse transplant model.
- Defined prolonged T cell-dendritic cell interactions as those lasting ≥500 seconds, by blocking CD4-MHC class II and CD28-B7 pathways.
- Examined T cell-dendritic cell interactions during acute rejection, tolerance, and regulatory T cell-mediated control.
- Validated findings using human regulatory T cells and high-throughput imaging flow cytometry.
Main Results:
- The frequency of prolonged T cell-dendritic cell contacts was elevated during acute rejection and reduced in unresponsive states.
- Regulatory T cells significantly decreased the duration of these prolonged interactions.
- This effect was successfully replicated with human regulatory T cells.
- Differential allogeneic immune synapse formation was visualized in human CD4(+) T cells.
Conclusions:
- Prolonged T cell-dendritic cell interactions serve as a potential biomarker for predicting transplant rejection or tolerance.
- Regulatory T cells play a key role in mitigating prolonged T cell-donor interactions.
- This approach shows promise for developing novel assays for immunosuppression withdrawal in transplantation.
