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Updated: Feb 15, 2026
Whole-animal Imaging and Flow Cytometric Techniques for Analysis of Antigen-specific CD8+ T Cell Responses after Nanoparticle Vaccination
Published on: April 29, 2015
Cytometric assessment of antigen-specific T cell signaling
Zachary H Walsh1, Shivem Shah2, Johannes C Melms1
1Columbia University Vagelos College of Physicians and Surgeons, New York, NY, United States; Department of Medicine, Division of Hematology and Oncology, Columbia University Irving Medical Center, New York, NY, United States; Columbia Center for Translational Immunology, New York, NY, United States; Herbert Irving Comprehensive Cancer Center, Columbia University Irving Medical Center, New York, NY, United States.
Abstract:
T cell receptor (TCR) signaling strength influences critical T cell characteristics including cytotoxic capacity, differentiation, memory formation, and exhaustion. Naturally occurring or engineered single-nucleotide variants (SNVs) and gene deletions which modulate T cell signaling pathways can significantly impact the potency of T cell cytolytic activity, including in the setting of T cell-based immunotherapies such as tumor-infiltrating lymphocyte (TIL) therapy and chimeric antigen receptor T cell (CAR T) therapy. Thus, studying T cell signaling represents a valuable component of the engineering and preclinical testing process for cell therapies and immune checkpoint blockade (ICB). Flow cytometry is a powerful experimental and diagnostic tool which enables rapid, quantitative analysis of T cell signaling responses by phosphoprotein detection with fluorophore-labeled antibodies. However, many approaches that have been developed to induce and study T cell signaling rely on supraphysiological and non-specific stimulation methods, such as crosslinking of T cell CD3 and CD28 or treatment with chemical stimulating agents such as ionomycin and phorbol 12-myristate 13-acetate (PMA). These assays bypass the endogenous TCR machinery and limit the conclusions which can be drawn regarding the physiological relevance of the T cell responses measured. Here, we present a simple, efficient, and scalable workflow to assess physiological T cell signaling responses to antigen-specific stimulation with cognate peptide-MHC expressing target cells using flow cytometry. With minimal modifications, this approach can be successfully applied to the study of chimeric antigen receptor (CAR) signaling or signaling in other immune cell subtypes such as B cells, using analogous antigen-matched co-culture systems.
Insights
This study introduces a new flow cytometry method to measure T cell signaling accurately. This technique uses antigen-specific stimulation for more relevant insights into T cell responses for immunotherapies.
Area of Science:
- Immunology
- Cellular Signaling
- Biotechnology
Background:
- T cell receptor (TCR) signaling strength is crucial for T cell functions like cytotoxicity, differentiation, memory, and exhaustion.
- Genetic variations impacting TCR signaling pathways can alter T cell potency, affecting immunotherapies like tumor-infiltrating lymphocyte (TIL) and chimeric antigen receptor T cell (CAR T) therapies.
- Studying T cell signaling is vital for engineering and preclinical testing of cell therapies and immune checkpoint blockade (ICB).
Purpose of the Study:
- To develop a simple, efficient, and scalable workflow for assessing physiological T cell signaling responses.
- To enable the study of T cell signaling using antigen-specific stimulation via cognate peptide-MHC expressing target cells.
- To provide a method adaptable for studying chimeric antigen receptor (CAR) signaling and other immune cell subtypes like B cells.
Main Methods:
- Utilized flow cytometry for rapid, quantitative analysis of T cell signaling through phosphoprotein detection.
- Developed a workflow employing antigen-specific stimulation with cognate peptide-MHC expressing target cells.
- Adapted the method for studying CAR T cell signaling and B cell signaling using co-culture systems.
Main Results:
- Presented a workflow for assessing physiological T cell signaling responses to antigen-specific stimulation.
- Demonstrated the workflow's applicability to T cell signaling studies using flow cytometry.
- Showcased the method's adaptability for CAR T cell and B cell signaling analysis.
Conclusions:
- The presented workflow enables the assessment of physiological T cell signaling responses to antigen-specific stimulation.
- This approach overcomes limitations of non-specific stimulation methods, offering more relevant insights.
- The method is versatile and can be applied to various immune cell signaling studies, including CAR T cell therapy research.
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