Improving Single-Cell Encapsulation Efficiency and Reliability through Neutral Buoyancy of Suspension

Area of Science:

• Biotechnology
• Cell Biology
• Microfluidics

Background:

• Single-cell analysis is crucial for understanding cellular heterogeneity and identifying rare cell populations.
• Droplet-based microfluidics enables high-throughput single-cell analysis but faces challenges with cell sedimentation and aggregation.
• Maximizing single-cell encapsulation efficiency is vital for accurate and comprehensive single-cell studies.

Purpose of the Study:

• To investigate the impact of neutral buoyancy on single-cell encapsulation and incubation efficiency.
• To assess the feasibility of using neutral buoyancy to overcome cell sedimentation and aggregation issues in microfluidic systems.
• To evaluate the non-toxic effects of neutral buoyancy agents on cell viability.

Main Methods:

• Development of neutrally buoyant cell suspensions using OptiPrep™.
• Encapsulation of THP-1 cells (human monocytic leukemia cell line) in microdroplets.
• Assessment of single-cell encapsulation efficiency and cell viability in the presence of OptiPrep™.

Main Results:

• Neutrally buoyant cell suspensions significantly increased the efficiency of single-cell encapsulation in microdroplets.
• The neutral buoyancy method effectively eliminated cell loss due to sedimentation and aggregation.
• OptiPrep™ demonstrated no adverse effects on cellular viability during the encapsulation and incubation process.

Conclusions:

• Neutral buoyancy is a highly effective strategy for enhancing single-cell encapsulation in microfluidic devices.
• This approach improves the overall effectiveness of single-cell analysis by ensuring uniform cell distribution and minimizing cell loss.
• The non-toxic nature of the method facilitates robust single-cell studies and is broadly applicable to various cell types.