Single-Cell Cytokine Analysis to Characterize CAR-T Cell Activation

Area of Science:

• Immunology
• Cell Biology
• Biotechnology

Background:

• Adoptive transfer of anti-CD19 chimeric antigen receptor (CAR) T cells is a growing immunotherapy approach.
• Understanding the heterogeneity of CAR T-cell responses, particularly cytokine secretion, is crucial for optimizing therapy.
• Traditional bulk activation methods mask individual cell behavior and cytokine profiles.

Purpose of the Study:

• To introduce a novel platform for studying single-cell cytokine responses of CAR T cells upon activation.
• To compare single-cell secretomic analysis with traditional bulk activation methods.
• To enable high-throughput, multiplexed detection of cytokine secretions at the single-cell level.

Main Methods:

• Development of a single-cell activation platform incubating single CAR T cells with single antigen-presenting cells (APCs).
• Utilizing a high-throughput, multiplexed single-cell secretomic microchip with antibody barcode arrays and subnanoliter microchambers.
• Detection of up to 42 unique proteins secreted by individual CAR T cells post-activation.

Main Results:

• The platform successfully measures heterogeneous cytokine responses at the single-cell level.
• Demonstrated capability to analyze both cell lines and primary cells.
• Enabled comparison between single-cell and bulk activation secretomic profiles.

Conclusions:

• The novel platform provides unprecedented insight into single-cell CAR T-cell secretomics.
• This technology can advance the understanding and optimization of CAR T-cell therapies.
• The microchip platform is adaptable for various cell types and research applications.