A microfluidic device for simultaneous electrical and mechanical measurements on single cells.

Area of Science:

• Biomedical Engineering
• Cellular Biophysics
• Microfluidics

Background:

• Simultaneous characterization of single-cell mechanical and electrical properties is crucial for understanding cell behavior.
• Existing methods often require separate analyses, limiting throughput and efficiency.
• Microfluidic platforms offer a promising avenue for integrated cellular analysis.

Purpose of the Study:

• To present a novel microfluidic device for concurrent mechanical and electrical characterization of single cells.
• To validate the device's performance by measuring the properties of MC-3T3 osteoblast cells.
• To enable comprehensive single-cell analysis on a single chip.

Main Methods:

• Development of a microfluidic device integrating impedance spectroscopy and micropipette aspiration.
• Measurement of electrical properties (membrane capacitance, cytoplasm resistance) using impedance spectroscopy.
• Assessment of mechanical properties (aspiration length, Young's modulus) via micropipette aspiration.
• Application to MC-3T3 osteoblast cells under varying aspiration pressures (50 Pa and 100 Pa).

Main Results:

• Successfully characterized electrical properties: membrane capacitance (2.99–3.39 pF) and cytoplasm resistance (110.1–145.2 kΩ).
• Quantified mechanical properties: aspiration length (0.813–1.771 μm) and Young's modulus (344–377 Pa).
• Demonstrated device's capability to perform simultaneous electrical and mechanical measurements on single cells.

Conclusions:

• The developed microfluidic device effectively enables simultaneous mechanical and electrical characterization of single cells.
• The integrated approach provides valuable insights into cell biophysical properties.
• This technology holds potential for advancing cell-based assays and diagnostics.