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Updated: Dec 31, 2025
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Dynamic Imaging of Chimeric Antigen Receptor T Cells with [18F]Tetrafluoroborate Positron Emission Tomography/Computed Tomography
Published on: February 17, 2022
Imaging Chimeric Antigen Receptor (CAR) Activation
1Department of Cell Biology, Yale School of Medicine, New Haven, CT, USA.
Abstract:
The chimeric antigen receptor (CAR) has been extensively exploited in cancer immunotherapy. In spite of the success of CAR T cells in clinical applications, the molecular mechanism underlying CAR-T cell activation remains unclear. Key questions remain: how are CARs activated by tumor antigens? How do activated CARs transduce signaling to downstream pathways? Here we introduce a microscopy-based method for studying CAR signaling. We use an antigen-coated supported lipid bilayer to activate CARs and combine it with TIRF microscopy to visualize the initial activation process of CAR T cells. This enables monitoring CAR signaling at high spatial and temporal resolutions.
Insights
Chimeric antigen receptor (CAR) T cell activation mechanisms are unclear. This study introduces a microscopy method using supported lipid bilayers and TIRF microscopy to visualize CAR signaling dynamics at high resolution.
Area of Science:
- Immunology
- Cell Biology
- Biophysics
Background:
- Chimeric antigen receptor (CAR) T cell therapy is a promising cancer immunotherapy.
- The precise molecular mechanisms of CAR T cell activation by tumor antigens remain poorly understood.
- Understanding CAR signaling is crucial for improving CAR T cell efficacy.
Purpose of the Study:
- To investigate the molecular mechanisms of CAR T cell activation.
- To develop a high-resolution method for visualizing CAR signaling.
- To address key questions regarding CAR activation and signal transduction.
Main Methods:
- Development of a microscopy-based assay for CAR signaling studies.
- Utilizing antigen-coated supported lipid bilayers to trigger CAR activation.
- Employing Total Internal Reflection Fluorescence (TIRF) microscopy to visualize early CAR T cell activation events.
Main Results:
- The study presents a novel method for observing CAR signaling.
- Visualized initial CAR activation processes at the cell surface.
- Achieved high spatial and temporal resolution in monitoring CAR signaling dynamics.
Conclusions:
- The developed microscopy technique provides unprecedented insight into CAR signaling.
- This method facilitates the study of fundamental CAR T cell activation processes.
- Further research using this technique can optimize CAR T cell-based cancer immunotherapies.
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