Related Experiment Video
Updated: May 31, 2026
11:06
Preparation of Bead-supported Lipid Bilayers to Study the Particulate Output of T Cell Immune Synapses
Published on: April 1, 2022
Identification of T:B Cell Multimers After Bispecific T Cell Engagement, Using Both Conventional and Imaging Flow
Joanne E Davis1,2, Mandy Ludford-Menting1,2, Helena Peng1,2
1ACRF Translational Research Laboratory, The Royal Melbourne Hospital, Melbourne, Victoria, Australia.
Summary
Bispecific T cell engagers create T cell:malignant B cell conjugates for cancer therapy. Both conventional and imaging flow cytometry can detect these T:B synapses, aiding in treatment response assessment.
Area of Science:
- Immunology
- Oncology
- Biotechnology
Background:
- Bispecific T cell engagers (BiTEs) are crucial in treating hematological malignancies by linking T cells to malignant B cells.
- Patient-specific variations in T cell proportion and target binding can influence treatment efficacy and serve as potential biomarkers.
- Accurate detection of T cell:B cell conjugates is essential for understanding BiTE mechanism of action and predicting patient response.
Purpose of the Study:
- To develop and validate a method for detecting T cell:B cell conjugates formed by bispecific antibody engagement.
- To compare the capabilities of conventional flow cytometry and imaging flow cytometry in identifying these conjugates.
- To assess the impact of bispecific antibodies on T cell synapse formation and multimerization.
Main Methods:
- Development of a flow cytometry-based assay to detect T cell:B cell conjugates.
- Confirmation and detailed analysis using imaging flow cytometry.
- Evaluation of T cell memory phenotype markers (CD45RA, CCR7) on bound T cells.
Main Results:
- Bispecific antibody engagement led to the formation of multimers with multiple T cells bound to each malignant B cell target.
- Imaging flow cytometry confirmed significant increases in multimer number and size post-BiTE incubation.
- Conventional flow cytometry exhibited altered T cell memory marker expression (CD45RA, CCR7) on T cells within conjugates, potentially misrepresenting their phenotype.
- Both flow cytometry platforms successfully identified increased T:B synapse and multimer formation.
Conclusions:
- Conventional and imaging flow cytometry are both suitable for identifying T cell:target cell conjugates induced by bispecific T cell engagers.
- Imaging flow cytometry provides enhanced visualization and verification of conjugate formation and multimerization.
- Understanding conjugate dynamics is key for optimizing BiTE therapy and patient stratification.
