Journal
BIOSENSORS & BIOELECTRONICS
Volume 111, Issue -, Pages 138-143Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2018.04.015
Keywords
Microfluidic impedance cytometry; Single-cell analysis; Cellular electrical properties; Neural network based cell type classification; High throughput
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Funding
- National Basic Research Program of China (973 Program) [2014CB744600]
- National Natural Science Foundation of China [61431019, 61671430, 61571437, 31671459]
- National Key R D Program [2016YFC0900201]
- Chinese Academy of Sciences [QYZDB-SSW-JSC011]
- Qimingxing Project [15QA1404200]
- State Key Laboratory of Luminescence and Application [SKLA-2016-12]
- Instrument Development Program of the Chinese Academy of Sciences
- Youth Innovation Promotion Association of Chinese Academy of Sciences
- CAS Interdisciplinary Innovation Team
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This paper presents a new microfluidic impedance cytometry with crossing constriction microchannels, enabling the characterization of cellular electrical markers (e.g., specific membrane capacitance (C-sm) and cytoplasm conductivity (sigma(cy))) in large cell populations (similar to 100,000 cells) at a rate greater than 100 cells/s. Single cells were aspirated continuously through the major constriction channel with a proper sealing of the side constriction channel. An equivalent circuit model was developed and the measured impedance values were translated to C-sm and sigma(cy). Neural network was used to classify different cell populations where classification success rates were calculated. To evaluate the developed technique, different tumour cell lines, and the effects of epithelial-mesenchymal transitions on tumour cells were examined. Significant differences in both C-sm and sigma(cy), were found for H1299 and HeLa cell lines with a classification success rate of 90.9% in combination of the two parameters. Meanwhile, tumour cells A549 showed significant decreases in both C-sm and sigma(cy) after epithelial-mesenchymal transitions with a classification success rate of 76.5%. As a high-throughput microfluidic impedance cytometry, this technique can add a new marker-free dimension to flow cytometry in single-cell analysis.
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