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Quantifying mechanical opacity as a novel indicator for single-cell phenotyping via integrated dynamic mechanical
Shan-Shan Li1,2, Chun-Dong Xue1,3, Si-Yu Hu2
1Institute of Oncology, Cancer Hospital of Dalian University of Technology, Liaoning Cancer Hospital and Institute, Shenyang 110044, P.R. China. xuechundong@dlut.edu.cn.
Lab on a Chip
|July 4, 2025
Summary
We developed a new method to measure cell mechanics by combining compression with electrical impedance. This technique quantifies "mechanical opacity," revealing cell differences and linking mechanical stress to electrical properties for cell analysis.
Area of Science:
- Biophysics
- Cell Biology
- Electrical Engineering
Background:
- Cellular mechanical heterogeneity is key to understanding cell phenotypes.
- Impedance flow cytometry (IFC) measures cell electrical properties label-free.
- Current IFC methods neglect mechanical perturbations affecting cell structure and electrical response.
Purpose of the Study:
- To develop an integrated system for quantifying mechanical opacity under dynamic deformation.
- To establish mechanical opacity as a dynamic, label-free marker for single-cell mechanics.
- To explore applications in cell classification, drug screening, and disease diagnostics.
Main Methods:
- Integrated system combining controlled mechanical compression with impedance measurement.
- Quantification of mechanical opacity, an electrical metric reflecting membrane permeability during deformation.
- Dual-frequency (500 kHz and 5 MHz) impedance measurements and a four-parameter feature set (R_squ, R_sti1, R_sti2, R_relax) for capturing impedance changes.
Main Results:
- Mechanical opacity correlates with cytoskeletal integrity and reveals how mechanical stimuli influence electrical responses.
- Theoretical modeling confirmed the role of membrane permittivity and conductivity in frequency-dependent impedance.
- Distinct mechanical opacity profiles were observed in three human cancer cell lines (HeLa, SW1990, BxPC-3), reflecting their biomechanical differences.
- Fluorescence assays confirmed that lower mechanical opacity corresponds to increased membrane permeability.
Conclusions:
- Mechanical opacity is a novel, dynamic, label-free marker for single-cell mechanics.
- The developed system bridges mechanical stimulation and electrical detection, enhancing IFC capabilities.
- This approach offers potential for advanced cell classification, drug screening, and disease diagnostics.
