Characterization of Single-Nucleus Electrical Properties by Microfluidic Constriction Channel

As key bioelectrical markers, equivalent capacitance (C , i.e., capacitance per unit area) and resistance (R , i.e., resistivity multiply thickness) of nuclear envelopes have emerged as promising electrical indicators, which cannot be effectively measured by conventional approaches. In this study, s...

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Bibliographic Details
Published in:Micromachines (Basel) 2019-10, Vol.10 (11), p.740
Main Authors: Liang, Hongyan, Zhang, Yi, Chen, Deyong, Tan, Huiwen, Zheng, Yu, Wang, Junbo, Chen, Jian
Format: Article
Language:English
Subjects:
Bioelectricity
Capacitance
constriction channel
Constrictions
Electrical properties
Equivalence
Exocrine glands
Markers
Membranes
Microfluidics
nuclear envelope
Nuclei (cytology)
single-nucleus analysis
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Summary:As key bioelectrical markers, equivalent capacitance (C , i.e., capacitance per unit area) and resistance (R , i.e., resistivity multiply thickness) of nuclear envelopes have emerged as promising electrical indicators, which cannot be effectively measured by conventional approaches. In this study, single nuclei were isolated from whole cells and trapped at the entrances of microfluidic constriction channels, and then corresponding impedance profiles were sampled and translated into single-nucleus C and R based on a home-developed equivalent electrical model. C and R of A549 nuclei were first quantified as 3.43 ± 1.81 μF/cm and 2.03 ± 1.40 Ω·cm (N = 35), which were shown not to be affected by variations of key parameters in nuclear isolation and measurement. The developed approach in this study was also used to measure a second type of nuclei, producing C and R of 3.75 ± 3.17 μF/cm and 1.01 ± 0.70 Ω·cm for SW620 (N = 17). This study may provide a new perspective in single-cell electrical characterization, enabling cell type classification and cell status evaluation based on bioelectrical markers of nuclei.
ISSN:2072-666X
2072-666X
DOI:10.3390/mi10110740