Measuring interaction force between T lymphocytes and their target cells using live microscopy and laminar shear flow...

Area of Science:

• Immunology
• Cell Biology
• Biophysics

Background:

• Understanding the immunological synapse is key to immune response.
• Existing methods for measuring cell-cell interaction forces are limited, often analyzing one pair at a time.

Purpose of the Study:

• To develop and validate a novel laminar shear flow-based method for measuring immunological synapse rupture forces.
• To investigate the role of adenomatous polyposis coli (APC) in the stability of cytotoxic T cell-tumor cell interactions.

Main Methods:

• A laminar shear flow system was used to apply controlled dragging forces to immobilized T cell-target cell conjugates.
• Synapse rupture forces were measured by monitoring cell detachment at increasing flow rates across a population of cell pairs.
• Cells were collected and sorted based on measured rupture forces.

Main Results:

• The method allows for the measurement of synapse rupture forces ranging from 10 pN to 20 nN for hundreds of cell pairs in a single experiment.
• Reduced expression of adenomatous polyposis coli (APC) was found to impair T cell adhesion to tumor target cells.
• This suggests a significant impact of APC mutations on anti-tumor immune defense.

Conclusions:

• The developed shear flow method provides a high-throughput approach to quantify immunological synapse stability.
• Adenomatous polyposis coli (APC) plays a critical role in maintaining the stability of cytotoxic T cell-tumor cell interactions.
• APC's function in T cell adhesion highlights its importance in effective anti-tumor immune responses.