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An impedance method for spatial sensing of 3D cell constructs--towards applications in tissue engineering.

C Canali1, C Mazzoni, L B Larsen

  • 1Department of Micro- and Nanotechnology, Technical University of Denmark, 2800, Kgs. Lyngby, Denmark. jenny.emneus@nanotech.dtu.dk.

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Summary

Multiplexed impedance measurements can locate cell aggregates in 3D scaffolds. This impedance sensing technology offers new non-invasive monitoring for tissue engineering, improving spatial understanding of constructs.

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Area of Science:

  • Biomedical Engineering
  • Bioimpedance Sensing
  • Tissue Engineering

Background:

  • Sensing cell aggregate location in 3D scaffolds is crucial for tissue engineering.
  • Current methods lack non-invasive spatial resolution within complex 3D environments.
  • Multiplexed impedance measurements offer a potential solution for in situ monitoring.

Purpose of the Study:

  • To characterize and validate multiplexed four-terminal (4T) impedance measurements for spatial sensing of cell aggregates.
  • To optimize electrode configurations using finite element simulations for enhanced sensitivity and resolution.
  • To demonstrate the application in detecting cell constructs within gelatin scaffolds.

Main Methods:

  • Utilized an array of platinum needle electrodes in rectangular chambers for parallel analysis.
  • Employed finite element simulations to optimize electrode placement for sensitivity and spatial resolution.
  • Experimentally tested eight 4T combinations and validated simulations with conductivity phantoms.
  • Performed single-frequency analysis at 250 kHz and demonstrated proof-of-concept with HepG2 cell constructs.

Main Results:

  • Achieved a detection limit (volume sensitivity) of 16.5% for cell aggregates.
  • Optimized electrode configurations demonstrated improved sensitivity field distribution and spatial resolution.
  • Successfully detected human hepatoblastoma (HepG2) cell aggregates within gelatin scaffolds at various positions.
  • Identified a common frequency (250 kHz) for efficient single-frequency analysis across electrode combinations.

Conclusions:

  • Multiplexed 4T impedance measurements are validated as a robust method for spatial sensing in 3D tissue engineering scaffolds.
  • This technology enables non-invasive, real-time monitoring of cell construct location and distribution.
  • Opens new avenues for impedance-based sensing in advanced tissue engineering and regenerative medicine applications.