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Adams TNG, Jiang AYL, Mendoza NS, Ro CC, Lee DH, Lee AP, Flanagan LA. Label-free enrichment of fate-biased human neural stem and progenitor cells. Biosens Bioelectron 2020; 152:111982. [PMID: 32056730 PMCID: PMC8860404 DOI: 10.1016/j.bios.2019.111982] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Revised: 11/21/2019] [Accepted: 12/20/2019] [Indexed: 12/12/2022]
Abstract
Human neural stem and progenitor cells (hNSPCs) have therapeutic potential to treat neural diseases and injuries since they provide neuroprotection and differentiate into astrocytes, neurons, and oligodendrocytes. However, cultures of hNSPCs are heterogeneous, containing cells linked to distinct differentiated cell fates. HNSPCs that differentiate into astrocytes are of interest for specific neurological diseases, creating a need for approaches that can detect and isolate these cells. Astrocyte-biased hNSPCs differ from other cell types in electrophysiological properties, namely membrane capacitance, and we hypothesized that this could be used to enrich these cells using dielectrophoresis (DEP). We implemented a two-step DEP sorting scheme, consisting of analysis to define the optimal sorting frequency followed by separation of cells at that frequency, to test whether astrocyte-biased cells could be separated from the other cell types present in hNSPC cultures. We developed a novel device that increased sorting reproducibility and provided both enriched and depleted cell populations in a single sort. Astrocyte-biased cells were successfully enriched from hNSPC cultures by DEP sorting, making this the first study to use electrophysiological properties for label-free enrichment of human astrocyte-biased cells. Enriched astrocyte-biased human cells enable future experiments to determine the specific properties of these important cells and test their therapeutic efficacy in animal models of neurological diseases.
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Affiliation(s)
- Tayloria N G Adams
- Department of Chemical and Biomolecular Engineering, University of California, Irvine, Irvine, CA, 92697-2580, USA; Department of Neurology, University of California, Irvine, Irvine, CA, 92697-6750, USA; Sue & Bill Gross Stem Cell Research Center, University of California, Irvine, CA, 92697-1705, USA.
| | - Alan Y L Jiang
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, 92697-2627, USA; Department of Neurology, University of California, Irvine, Irvine, CA, 92697-6750, USA; Sue & Bill Gross Stem Cell Research Center, University of California, Irvine, CA, 92697-1705, USA
| | - Nicolo S Mendoza
- Department of Neurology, University of California, Irvine, Irvine, CA, 92697-6750, USA; Sue & Bill Gross Stem Cell Research Center, University of California, Irvine, CA, 92697-1705, USA
| | - Clarissa C Ro
- Department of Neurology, University of California, Irvine, Irvine, CA, 92697-6750, USA; Sue & Bill Gross Stem Cell Research Center, University of California, Irvine, CA, 92697-1705, USA
| | - Do-Hyun Lee
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, 92697-2627, USA
| | - Abraham P Lee
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, 92697-2627, USA
| | - Lisa A Flanagan
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, 92697-2627, USA; Department of Neurology, University of California, Irvine, Irvine, CA, 92697-6750, USA; Sue & Bill Gross Stem Cell Research Center, University of California, Irvine, CA, 92697-1705, USA; Department of Anatomy & Neurobiology, University of California, Irvine, Irvine, CA, 92697-4291, USA.
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S Iliescu F, Sim WJ, Heidari H, P Poenar D, Miao J, Taylor HK, Iliescu C. Highlighting the uniqueness in dielectrophoretic enrichment of circulating tumor cells. Electrophoresis 2019; 40:1457-1477. [PMID: 30676660 DOI: 10.1002/elps.201800446] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Revised: 01/19/2019] [Accepted: 01/20/2019] [Indexed: 12/14/2022]
Abstract
Circulating tumor cells (CTCs) play an essential role in the metastasis of tumors, and thus can serve as a valuable prognostic factor for malignant diseases. As a result, the ability to isolate and characterize CTCs is essential. This review underlines the potential of dielectrophoresis for CTCs enrichment. It begins by summarizing the key performance parameters and challenges of CTCs isolation using microfluidics. The two main categories of CTCs enrichment-affinity-based and label-free methods-are analysed, emphasising the advantages and disadvantages of each as well as their clinical potential. While the main argument in favour of affinity-based methods is the strong specificity of CTCs isolation, the major advantage of the label-free technologies is in preserving the integrity of the cellular membrane, an essential requirement for downstream characterization. Moving forward, we try to answer the main question: "What makes dielectrophoresis a method of choice in CTCs isolation?" The uniqueness of dielectrophoretic CTCs enrichment resides in coupling the specificity of the isolation process with the conservation of the membrane surface. The specificity of the dielectrophoretic method stems from the differences in the dielectric properties between CTCs and other cells in the blood: the capacitances of the malignantly transformed cellular membranes of CTCs differ from those of other cells. Examples of dielectrophoretic devices are described and their performance evaluated. Critical requirements for using dielectrophoresis to isolate CTCs are highlighted. Finally, we consider that DEP has the potential of becoming a cytometric method for large-scale sorting and characterization of cells.
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Affiliation(s)
| | - Wen Jing Sim
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore.,NUS Synthetic Biology for Clinical and Technological Innovation (SynCTI), National University of Singapore, Singapore
| | - Hossein Heidari
- Department of Mechanical Engineering, University of California, Berkeley, CA, USA
| | - Daniel P Poenar
- VALENS-Centre for Bio Devices and Signal Analysis, Nanyang Technological University, Singapore
| | - Jianmin Miao
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore
| | - Hayden K Taylor
- Department of Mechanical Engineering, University of California, Berkeley, CA, USA
| | - Ciprian Iliescu
- Biomedical Institute for Global Health Research & Technology (BIGHEART), National University of Singapore, Singapore
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