Profiling of immune-cancer interactions at the single-cell level using a microfluidic well array.

Area of Science:

• Immunology
• Biotechnology
• Cancer Research

Background:

• Cancer immunotherapy shows promise in blood cancers but faces challenges due to immune cell heterogeneity.
• Current methods average immune cell behavior, masking individual T cell responses and tumor-killing efficacy.
• Understanding single-cell dynamics is vital for predicting patient response to immunotherapy.

Purpose of the Study:

• To develop a microfluidic microwell array for massive parallel analysis of immune cell heterogeneity.
• To investigate single-cell interactions between T cells and tumor cells.
• To reveal details of T cell activation, immune synapse formation, and tumor cell killing at the single-cell level.

Main Methods:

• A microfluidic microwell array device was designed for high-throughput single-cell analysis.
• Precise control over tumor cell and T cell ratios within 6400 microfluidic wells.
• Simultaneous interrogation of CD8+ T cell and leukemia cell interactions.

Main Results:

• The device enables detailed analysis of immunocyte heterogeneity during interactions with tumor cells.
• Revealed heterogeneity in T cell killing capacity and time-dependent killing dynamics.
• Demonstrated the ability to observe drug treatment-induced dynamic shifts in cell interactions.

Conclusions:

• This microfluidic approach uncovers critical single-cell details previously hidden in bulk analyses.
• It offers a powerful tool for investigating cancer immunotherapy efficacy and resistance mechanisms.
• Facilitates a deeper understanding of cancer immunity and supports personalized therapy development.