Single-cell electro-mechanical shear flow deformability cytometry.

Area of Science:

• Cellular Biophysics
• Microfluidics
• Biotechnology

Background:

• Cellular structure dictates unique dielectric and mechanical properties, serving as phenotypic markers.
• Distinguishing cell populations requires methods to characterize these intrinsic properties.

Purpose of the Study:

• To develop a high-throughput microfluidic technique for simultaneous characterization of single cell electrical and mechanical properties.
• To establish a novel method for cell population analysis based on electro-mechanical profiling.

Main Methods:

• Utilized non-contact shear flow deformability cytometry in a microfluidic channel.
• Measured electrical impedance along orthogonal axes during cell deformation by viscoelastic fluid shear.
• Correlated electrical deformability with optical measurements of cell shape change.

Main Results:

• Achieved a throughput of approximately 100 cells per second.
• Demonstrated excellent correlation between optically and electrically determined cell deformability.
• Validated system performance using cells subjected to osmotic shock, cross-linking, and cytoskeletal disruption.

Conclusions:

• The developed shear flow deformability cytometer is a simple, high-speed, and accurate tool for characterizing single cell electro-mechanical properties.
• This technique offers a novel approach for distinguishing cell populations based on their intrinsic biophysical markers.
• The system's simplicity and high throughput make it suitable for various cell analysis applications without requiring sheath flow or high-speed imaging.