Electronic profiling of membrane antigen expression via immunomagnetic cell manipulation

Area of Science:

• Biomedical Engineering
• Cell Biology
• Analytical Chemistry

Background:

• Membrane antigens are crucial diagnostic and prognostic targets in biomedicine.
• Current fluorescent-based cytometry methods require complex, expensive instrumentation, limiting accessibility.
• There is a need for cost-effective and accessible cell analysis techniques.

Purpose of the Study:

• To develop a novel, frugal cytometry technique for measuring cell surface antigen expression.
• To enable direct expression profiling from non-purified clinical samples.
• To create a platform for point-of-care testing, especially in resource-limited settings.

Main Methods:

• Immunomagnetic labeling of cells.
• Electrical tracking of cell trajectories on a microfluidic chip under a magnetic field gradient.
• Measurement of surface antigen expression and cell size.
• Application to human breast cancer cells for epithelial cell adhesion molecule detection.

Main Results:

• The new cytometry technique achieves a throughput of >500 cells per minute.
• Measurements of surface expression and cell size closely correlate with traditional fluorescence-based flow cytometry.
• The method allows direct profiling of target subpopulations from unpurified samples.

Conclusions:

• This immunomagnetic cell manipulation-based measurement approach offers a cost-effective alternative to existing cytometry platforms.
• The disposable cytometer has significant potential for point-of-care testing of clinical samples.
• This technology can broaden access to quantitative cell analysis, particularly in resource-limited environments.