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Sub-second Extracellular Impedance Measurement of Epithelial Cell Monolayers using Step Excitations and Time-domain

Rongming Guo, Athena J Chien, Jake Hawks

    Biorxiv : the Preprint Server for Biology
    |February 27, 2026
    PubMed
    Summary

    A new method, Time-domain Epithelial Impedance Measurement (TEIM), allows sub-second measurements of epithelial barrier function, overcoming limitations of traditional electrochemical impedance spectroscopy (EIS). This advancement enables real-time monitoring of rapid biological changes in cell models.

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    Area of Science:

    • Biophysics
    • Cell Biology
    • Electrophysiology

    Background:

    • Extracellular electrochemical impedance spectroscopy (EIS) is valuable for in vitro epithelial research, assessing barrier integrity, morphology, and polarity via transepithelial electrical resistance (TER/TEER), transepithelial capacitance (TEC), and membrane ratio (α).
    • Traditional EIS requires tens of seconds per measurement due to broad frequency ranges, limiting its ability to capture rapid biological events.

    Purpose of the Study:

    • To introduce Time-domain Epithelial Impedance Measurement (TEIM), a novel method for sub-second extracellular impedance measurements of epithelial cell monolayers.
    • To demonstrate TEIM's capability to measure key epithelial parameters (TER, TEC, α) with significantly improved temporal resolution compared to EIS.

    Main Methods:

    • TEIM utilizes step (Heaviside function) current excitation and time-domain analysis of voltage transients, eliminating the need for Fourier transforms.
    • Measurements of TER, TEC, α, and model-derived impedance spectra were performed at a ~0.3 s sampling rate.
    • TEIM's accuracy and precision were validated against EIS using electrical circuits and human epithelial cell monolayers (16HBE, Caco-2).

    Main Results:

    • TEIM achieved a ~100-fold improvement in time resolution compared to traditional EIS.
    • Average percent errors for TEIM measurements against EIS were low, ranging from 0.17-3.55% for TER, 1.13-8.96% for TEC, and 0.59-26.35% for α.
    • TEIM successfully captured rapid, double-exponential transient changes in TER and TEC in Caco-2 cells treated with saponin, phenomena previously unresolvable with EIS.

    Conclusions:

    • TEIM provides a robust, high-time-resolution method for electrophysiological studies of epithelial cell monolayers and potentially more complex in vitro models.
    • This technique enables the study of rapid biological phenomena in epithelial models, advancing applications in disease modeling and therapeutic development.