Dynamic gap structure for high-throughput measurement of cellular mechanical properties

Area of Science:

• Biophysics
• Cell Biology
• Microfluidics

Background:

• Accurate measurement of cellular mechanical properties like Young's modulus is crucial for understanding cell function and disease.
• Existing deformability cytometry methods have limitations in throughput and control.

Purpose of the Study:

• To develop and validate a novel all-glass microfluidic platform with a Dynamic Gap Structure (DGS) for high-throughput, precise quantification of cellular mechanical properties.
• To assess the platform's ability to measure cell stiffness, detect dose-dependent changes, and compare its performance with existing techniques.

Main Methods:

• An all-glass microfluidic platform featuring a Dynamic Gap Structure (DGS) was designed, integrating an ultra-thin glass membrane within a microchannel.
• Cells were passed through a tunable constriction under controlled pressure, and whole-cell deformation was correlated with applied pressure to estimate Young's modulus.
• Pharmacological perturbation with latrunculin A was used to induce dose-dependent changes in cell stiffness.

Main Results:

• The DGS platform enabled high-throughput mechanical characterization of A549, C6, and NIH3T3 cells.
• The platform demonstrated sensitivity to cytoskeletal alterations, resolving stiffness differences of approximately 0.1-0.2 kPa.
• Measurements showed higher throughput and improved consistency compared to atomic force microscopy (AFM), with narrower modulus distributions.

Conclusions:

• The developed DGS microfluidic platform provides a robust, label-free method for mechanical phenotyping of cells.
• The platform shows significant potential for applications in cancer diagnostics, drug screening, and mechanobiology.
• Further investigation is required to extend the application to primary and clinical samples.