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Open AccessArticle

Sequential Cell-Processing System by Integrating Hydrodynamic Purification and Dielectrophoretic Trapping for Analyses of Suspended Cancer Cells

1
Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
2
New Products Development Dept., Corporate New Business Development Office, NOK Corporation, 4-3-1 Tsujido-shinmachi, Fujisawa-shi, Kanagawa-ken 251-0042, Japan
3
Japan Science and Technology Agency PRESTO, Saitama 332-0012, Japan
*
Author to whom correspondence should be addressed.
Micromachines 2020, 11(1), 47; https://doi.org/10.3390/mi11010047
Received: 4 December 2019 / Revised: 25 December 2019 / Accepted: 26 December 2019 / Published: 30 December 2019
(This article belongs to the Special Issue Microfluidics-based Liquid Biopsies)
Microfluidic devices employing dielectrophoresis (DEP) have been widely studied and applied in the manipulation and analysis of single cells. However, several pre-processing steps, such as the preparation of purified target samples and buffer exchanges, are necessary to utilize DEP forces for suspended cell samples. In this paper, a sequential cell-processing device, which is composed of pre-processing modules that employ deterministic lateral displacement (DLD) and a single-cell trapping device employing an electroactive microwell array (EMA), is proposed to perform the medium exchange followed by arraying single cells sequentially using DEP. Two original microfluidic devices were efficiently integrated by using the interconnecting substrate containing rubber gaskets that tightly connect the inlet and outlet of each device. Prostate cancer cells (PC3) suspended in phosphate-buffered saline buffer mixed with microbeads were separated and then resuspended into the DEP buffer in the integrated system. Thereafter, purified PC3 cells were trapped in a microwell array by using the positive DEP force. The achieved separation and trapping efficiencies exceeded 94% and 93%, respectively, when using the integrated processing system. This study demonstrates an integrated microfluidic device by processing suspended cell samples, without the requirement of complex preparation steps. View Full-Text
Keywords: dielectrophoresis; deterministic lateral displacement; purification; single-cell trapping dielectrophoresis; deterministic lateral displacement; purification; single-cell trapping
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Park, J.; Komori, T.; Uda, T.; Miyajima, K.; Fujii, T.; Kim, S.H. Sequential Cell-Processing System by Integrating Hydrodynamic Purification and Dielectrophoretic Trapping for Analyses of Suspended Cancer Cells. Micromachines 2020, 11, 47.

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