Efficient cell pairing in droplets using dual-color sorting

Area of Science:

• Biotechnology
• Cell Biology
• Microfluidics

Background:

• Microfluidic droplets are valuable for cell screening but limited to single cell types.
• Analyzing interactions between different cell types or using reporter cells is challenging.
• Low probability (13.5%) exists for co-encapsulating two distinct cell types in droplets.

Purpose of the Study:

• To develop a method for efficiently analyzing droplets containing specific combinations of two different cell types.
• To overcome the limitations of single-cell type analysis in microfluidic assays.
• To enable new cell-based assays, such as those in immunology and antibody screening.

Main Methods:

• Cells of different types were stained with distinct fluorescent dyes.
• Encapsulation of stained cells into microfluidic droplets.
• Utilized a compact sorting device for high-magnification analysis and cell fixation.
• Implemented dual-color sorting to isolate droplets with precisely two different cell types.

Main Results:

• Achieved high efficiency in collecting droplets with exactly two different cell types (up to 86.7%).
• Overall efficiency exceeded 97% when including droplets with one or more cells of each type.
• Demonstrated a viable method for specific collection and analysis of dual-cell droplets.

Conclusions:

• The developed dual-color microfluidic droplet sorting method overcomes previous limitations.
• This approach significantly enhances the efficiency of analyzing mixed cell populations in droplets.
• The technique is expected to facilitate diverse cell-based assays, including those in immunology and drug discovery.