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McCue C, Atari A, Parks S, Tseng YY, Varanasi KK. Reducing Cancer Cell Adhesion using Microtextured Surfaces. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2302401. [PMID: 37559167 DOI: 10.1002/smll.202302401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 06/30/2023] [Indexed: 08/11/2023]
Abstract
For the past century, trypsin has been the primary method of cell dissociation, largely without any major changes to the process. Enzymatic cell detachment strategies for large-scale cell culturing processes are popular but can be labor-intensive, potentially lead to the accumulation of genetic mutations, and produce large quantities of liquid waste. Therefore, engineering surfaces to lower cell adhesion strength could enable the next generation of cell culture surfaces for delicate primary cells and automated, high-throughput workflows. In this study, a process for creating microtextured polystyrene (PS) surfaces to measure the impact of microposts on the adhesion strength of cells is developed. Cell viability and proliferation assays show comparable results in two cancer cell lines between micropost surfaces and standard cell culture vessels. However, cell image analysis on microposts reveals that cell area decreases by half, and leads to an average twofold increase in cell length per area. Using a microfluidic-based method up to a seven times greater percentage of cells are removed from micropost surfaces than the flat control surfaces. These results show that micropost surfaces enable decreased cell adhesion strength while maintaining similar cell viabilities and proliferation as compared to flat PS surfaces.
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Affiliation(s)
- Caroline McCue
- Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA, 02139, USA
| | - Adel Atari
- Cancer Program, Broad Institute of Harvard and MIT, 415 Main St, Cambridge, MA, 02142, USA
| | - Sean Parks
- Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA, 02139, USA
| | - Yuen-Yi Tseng
- Cancer Program, Broad Institute of Harvard and MIT, 415 Main St, Cambridge, MA, 02142, USA
| | - Kripa K Varanasi
- Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA, 02139, USA
- Cancer Program, Broad Institute of Harvard and MIT, 415 Main St, Cambridge, MA, 02142, USA
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2
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Salari A, Appak-Baskoy S, Coe IR, Tsai SSH, Kolios MC. An ultrafast enzyme-free acoustic technique for detaching adhered cells in microchannels. RSC Adv 2021; 11:32824-32829. [PMID: 35493567 PMCID: PMC9042199 DOI: 10.1039/d1ra04875a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 09/26/2021] [Indexed: 12/20/2022] Open
Abstract
Adherent cultured cells are widely used biological tools for a variety of biochemical and biotechnology applications, including drug screening and gene expression analysis. One critical step in culturing adherent cells is the dissociation of cell monolayers into single-cell suspensions. Different enzymatic and non-enzymatic methods have been proposed for this purpose. Trypsinization, the most common enzymatic method for dislodging adhered cells, can be detrimental to cells, as it can damage cell membranes and ultimately cause cell death. Additionally, all available techniques require a prolonged treatment duration, typically on the order of minutes (5-10 min). Dissociation of cells becomes even more challenging in microfluidic devices, where, due to the nature of low Reynolds number flow and reduced mixing efficiency, multiple washing steps and prolonged trypsinization may be necessary to treat all cells. Here, we report a novel acoustofluidic method for the detachment of cells adhered onto a microchannel surface without exposing the cells to any enzymatic or non-enzymatic chemicals. This method enables a rapid (i.e., on the order of seconds), cost-effective, and easy-to-operate cell detachment strategy, yielding a detachment efficiency of ∼99% and cellular viability similar to that of the conventional trypsinization method. Also, as opposed to biochemical-based techniques (e.g., enzymatic), in our approach, cells are exposed to the dissociating agent (i.e., substrate-mediated acoustic excitation and microstreaming flow) only for as long as they remain attached to the substrate. After dissociation, the effect of acoustic excitation is reduced to microstreaming flow, therefore, minimizing unwanted effects of the dissociating agent on the cell phenotype. Additionally, our results suggest that cell excitation at acoustic powers lower than that required for complete cell detachment can potentially be employed for probing the adhesion strength of cell-substrate attachment. This novel approach can, therefore, be used for a wide range of lab-on-a-chip applications.
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Affiliation(s)
- Alinaghi Salari
- Institute for Biomedical Engineering, Science and Technology (iBEST) Toronto ON M5B 1T8 Canada
- Biomedical Engineering Graduate Program, Ryerson University Toronto ON M5B 2K3 Canada
| | - Sila Appak-Baskoy
- Institute for Biomedical Engineering, Science and Technology (iBEST) Toronto ON M5B 1T8 Canada
- Department of Chemistry and Biology, Ryerson University Toronto ON M5B 2K3 Canada
| | - Imogen R Coe
- Institute for Biomedical Engineering, Science and Technology (iBEST) Toronto ON M5B 1T8 Canada
- Department of Chemistry and Biology, Ryerson University Toronto ON M5B 2K3 Canada
- Molecular Science Graduate Program, Ryerson University Toronto ON M5B2K3 Canada
| | - Scott S H Tsai
- Institute for Biomedical Engineering, Science and Technology (iBEST) Toronto ON M5B 1T8 Canada
- Department of Mechanical and Industrial Engineering, Ryerson University Toronto ON M5B 2K3 Canada
| | - Michael C Kolios
- Institute for Biomedical Engineering, Science and Technology (iBEST) Toronto ON M5B 1T8 Canada
- Department of Physics, Ryerson University Toronto ON M5B 2K3 Canada
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Kwizera EA, Sun M, White AM, Li J, He X. Methods of Generating Dielectrophoretic Force for Microfluidic Manipulation of Bioparticles. ACS Biomater Sci Eng 2021; 7:2043-2063. [PMID: 33871975 PMCID: PMC8205986 DOI: 10.1021/acsbiomaterials.1c00083] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Manipulation of microscale bioparticles including living cells is of great significance to the broad bioengineering and biotechnology fields. Dielectrophoresis (DEP), which is defined as the interactions between dielectric particles and the electric field, is one of the most widely used techniques for the manipulation of bioparticles including cell separation, sorting, and trapping. Bioparticles experience a DEP force if they have a different polarization from the surrounding media in an electric field that is nonuniform in terms of the intensity and/or phase of the electric field. A comprehensive literature survey shows that the DEP-based microfluidic devices for manipulating bioparticles can be categorized according to the methods of creating the nonuniformity via patterned microchannels, electrodes, and media to generate the DEP force. These methods together with the theory of DEP force generation are described in this review, to provide a summary of the methods and materials that have been used to manipulate various bioparticles for various specific biological outcomes. Further developments of DEP-based technologies include identifying materials that better integrate with electrodes than current popular materials (silicone/glass) and improving the performance of DEP manipulation of bioparticles by combining it with other methods of handling bioparticles. Collectively, DEP-based microfluidic manipulation of bioparticles holds great potential for various biomedical applications.
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Affiliation(s)
- Elyahb A. Kwizera
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
| | - Mingrui Sun
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio 43210, USA
| | - Alisa M. White
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
| | - Jianrong Li
- Department of Veterinary Biosciences, The Ohio State University, Columbus, OH 43210, USA
| | - Xiaoming He
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio 43210, USA
- Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, MD 20742, USA
- Marlene and Stewart Greenebaum Comprehensive Cancer Center, University of Maryland, Baltimore, MD 21201, USA
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Henslee EA, Dunlop CM, de Mel CM, Carter EA, Abdallat RG, Camelliti P, Labeed FH. DEP-Dots for 3D cell culture: low-cost, high-repeatability, effective 3D cell culture in multiple gel systems. Sci Rep 2020; 10:14603. [PMID: 32884022 PMCID: PMC7471335 DOI: 10.1038/s41598-020-71265-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Accepted: 07/13/2020] [Indexed: 11/16/2022] Open
Abstract
It is known that cells grown in 3D are more tolerant to drug treatment than those grown in dispersion, but the mechanism for this is still not clear; cells grown in 3D have opportunities to develop inter-cell communication, but are also closely packed which may impede diffusion. In this study we examine methods for dielectrophoresis-based cell aggregation of both suspension and adherent cell lines, and compare the effect of various drugs on cells grown in 3D and 2D. Comparing viability of pharmacological interventions on 3D cell clusters against both suspension cells and adherent cells grown in monolayer, as well as against a unicellular organism with no propensity for intracellular communication, we suggest that 3D aggregates of adherent cells, compared to suspension cells, show a substantially different drug response to cells grown in monolayer, which increases as the IC50 is approached. Further, a mathematical model of the system for each agent demonstrates that changes to drug response are due to inherent changes in the system of adherent cells from the 2D to 3D state. Finally, differences in the electrophysiological membrane properties of the adherent cell type suggest this parameter plays an important role in the differences found in the 3D drug response.
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Affiliation(s)
- Erin A Henslee
- Centre for Biomedical Engineering, Department of Mechanical Engineering Sciences, University of Surrey, Guildford, GU2 7XH, Surrey, UK.,Department of Engineering, Wake Forest University, Wake Downtown, Winston-Salem, NC, 27109, USA
| | - Carina M Dunlop
- Department of Mathematics, University of Surrey, Guildford, GU2 7XH, Surrey, UK
| | - Christine M de Mel
- Centre for Biomedical Engineering, Department of Mechanical Engineering Sciences, University of Surrey, Guildford, GU2 7XH, Surrey, UK
| | - Emily A Carter
- Centre for Biomedical Engineering, Department of Mechanical Engineering Sciences, University of Surrey, Guildford, GU2 7XH, Surrey, UK
| | - Rula G Abdallat
- Centre for Biomedical Engineering, Department of Mechanical Engineering Sciences, University of Surrey, Guildford, GU2 7XH, Surrey, UK.,Department of Biomedical Engineering, Faculty of Engineering, The Hashemite University, PO Box 330127, Zarqa, 13133, Jordan
| | - Patrizia Camelliti
- School of Biosciences and Medicine, University of Surrey, Guildford, GU2 7XH, Surrey, UK
| | - Fatima H Labeed
- Centre for Biomedical Engineering, Department of Mechanical Engineering Sciences, University of Surrey, Guildford, GU2 7XH, Surrey, UK.
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Ten-Second Electrophysiology: Evaluation of the 3DEP Platform for high-speed, high-accuracy cell analysis. Sci Rep 2019; 9:19153. [PMID: 31844107 PMCID: PMC6915758 DOI: 10.1038/s41598-019-55579-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Accepted: 11/18/2019] [Indexed: 01/08/2023] Open
Abstract
Electrical correlates of the physiological state of a cell, such as membrane conductance and capacitance, as well as cytoplasm conductivity, contain vital information about cellular function, ion transport across the membrane, and propagation of electrical signals. They are, however, difficult to measure; gold-standard techniques are typically unable to measure more than a few cells per day, making widespread adoption difficult and limiting statistical reproducibility. We have developed a dielectrophoretic platform using a disposable 3D electrode geometry that accurately (r2 > 0.99) measures mean electrical properties of populations of ~20,000 cells, by taking parallel ensemble measurements of cells at 20 frequencies up to 45 MHz, in (typically) ten seconds. This allows acquisition of ultra-high-resolution (100-point) DEP spectra in under two minutes. Data acquired from a wide range of cells – from platelets to large cardiac cells - benchmark well with patch-clamp-data. These advantages are collectively demonstrated in a longitudinal (same-animal) study of rapidly-changing phenomena such as ultradian (2–3 hour) rhythmicity in whole blood samples of the common vole (Microtus arvalis), taken from 10 µl tail-nick blood samples and avoiding sacrifice of the animal that is typically required in these studies.
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6
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Henslee EA, Torcal Serrano RM, Labeed FH, Jabr RI, Fry CH, Hughes MP, Hoettges KF. Accurate quantification of apoptosis progression and toxicity using a dielectrophoretic approach. Analyst 2018; 141:6408-6415. [PMID: 27774532 DOI: 10.1039/c6an01596d] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A loss of ability of cells to undergo apoptosis (programmed cell death, whereby the cell ceases to function and destroys itself) is commonly associated with cancer, and many anti-cancer interventions aim to restart the process. Consequently, the accurate quantification of apoptosis is essential in understanding the function and performance of new anti-cancer drugs. Dielectrophoresis has previously been demonstrated to detect apoptosis more rapidly than other methods, and is low-cost, label-free and rapid, but has previously been unable to accurately quantify cells through the apoptotic process because cells in late apoptosis disintegrate, making cell tracking impossible. In this paper we use a novel method based on light absorbance and multi-population tracking to quantify the progress of apoptosis, benchmarking against conventional assays including MTT, trypan blue and Annexin-V. Analyses are performed on suspension and adherent cells, and using two apoptosis-inducing agents. IC50 measurements compared favourably to MTT and were superior to trypan blue, whilst also detecting apoptotic progression faster than Annexin-V.
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Affiliation(s)
- Erin A Henslee
- Centre for Biomedical Engineering, Department of Mechanical Engineering Sciences, University of Surrey, Guildford, Surrey GU2 7XH, UK.
| | - Ruth M Torcal Serrano
- Centre for Biomedical Engineering, Department of Mechanical Engineering Sciences, University of Surrey, Guildford, Surrey GU2 7XH, UK.
| | - Fatima H Labeed
- Centre for Biomedical Engineering, Department of Mechanical Engineering Sciences, University of Surrey, Guildford, Surrey GU2 7XH, UK.
| | - Rita I Jabr
- Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, UK
| | - Christopher H Fry
- Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, UK
| | - Michael P Hughes
- Centre for Biomedical Engineering, Department of Mechanical Engineering Sciences, University of Surrey, Guildford, Surrey GU2 7XH, UK.
| | - Kai F Hoettges
- Centre for Biomedical Engineering, Department of Mechanical Engineering Sciences, University of Surrey, Guildford, Surrey GU2 7XH, UK.
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Mahabadi S, Labeed FH, Hughes MP. Dielectrophoretic analysis of treated cancer cells for rapid assessment of treatment efficacy. Electrophoresis 2018; 39:1104-1110. [PMID: 29405335 DOI: 10.1002/elps.201700488] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Revised: 01/26/2018] [Accepted: 01/30/2018] [Indexed: 12/21/2022]
Abstract
Whilst personalized medicine (where interventions are precisely tailored to a patient's genotype and phenotype, as well as the nature and state of the disease) is regarded as an optimal form of treatment, the time and cost associated with it means it remains inaccessible to the greater public. A simpler alternative, stratified medicine, identifies groups of patients who are likely to respond to a given treatment. This allows appropriate treatments to be selected at the start of therapy, avoiding the common "trial and error" approach of replacing a therapy only once it is demonstrated to be ineffective in the patient. For stratification to be effective, tests are required that rapidly predict treatment effectiveness. Most tests use genetic analysis to identify drug targets, but these can be expensive and may not detect changes in the phenotype that affect drug sensitivity. An alternative method is to assess the whole-cell phenotype by evaluating drug response using cells from a biopsy. We assessed dielectrophoresis to assess drug efficacy on short timescales and at low cost. To explore the principle of assessing drug efficacy we examined two cell lines (one expressing EGFR, one not) with the drug Iressa. We then further explored the sensitive cells using combinations of chemotherapeutic and radiotherapeutic therapies. Our results compare with known effects of these cell/treatment combination, and offer the additional benefit over methods such as TUNEL of detecting drug effects such as cell cycle arrest, which do not cause cell death.
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Affiliation(s)
- Sina Mahabadi
- Centre for Biomedical Engineering, Department of Mechanical Engineering Sciences, University of Surrey, Guildford, UK
| | - Fatima H Labeed
- Centre for Biomedical Engineering, Department of Mechanical Engineering Sciences, University of Surrey, Guildford, UK
| | - Michael P Hughes
- Centre for Biomedical Engineering, Department of Mechanical Engineering Sciences, University of Surrey, Guildford, UK
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Rahmanian N, Bozorgmehr M, Torabi M, Akbari A, Zarnani AH. Cell separation: Potentials and pitfalls. Prep Biochem Biotechnol 2016; 47:38-51. [PMID: 27045194 DOI: 10.1080/10826068.2016.1163579] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Cell separation techniques play an indispensable part in numerous basic biological studies and even clinical settings. Although various cell isolation methods with diverse applications have been devised so far, not all of them have been able to gain widespread popularity among researchers and clinicians. There is not a single method known to be advantageous over all cell isolation techniques, and in fact, it is the researcher's aim in performing a study that determines the most suitable method. A perfect method for one study might not be necessarily a proper choice for another and likewise, expensive and complex isolation methods might not always be the best choices. There are several criteria such as cell purity, viability, activation status, and frequency that need to be given serious thought before selecting an isolation technique. Moreover, time and cost are two of the key elements that should be taken into consideration before implementing a project. Hence, here we provide a succinct description of six more popular cell separation methods with respect to their principles, advantages, and disadvantages as well as their most common applications. We further provide several key features of each technique so that it helps the researchers to take the first step toward opting for the best method that fits well into their projects.
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Affiliation(s)
- Narges Rahmanian
- a Department of Molecular Medicine, School of Advanced Technologies in Medicine , Tehran University of Medical Sciences , Tehran , Iran
| | - Mohmood Bozorgmehr
- b Oncopathology Research Center , Iran University of Medical Sciences , Tehran , Iran
| | - Monir Torabi
- c Department of Pathology, Shariati Hospital , Tehran University of Medical Sciences , Tehran , Iran
| | - Abolfazl Akbari
- d Colorectal Research Center , Iran University of Medical Sciences , Tehran , Iran
| | - Amir-Hassan Zarnani
- e Department of Immunology , School of Public Health, Tehran University of Medical Sciences , Tehran , Iran.,f Immunology Research Center , Iran University of Medical Sciences , Tehran , Iran
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Chen S, So EC, Strome SE, Zhang X. Impact of Detachment Methods on M2 Macrophage Phenotype and Function. J Immunol Methods 2015; 426:56-61. [PMID: 26253940 DOI: 10.1016/j.jim.2015.08.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Revised: 08/03/2015] [Accepted: 08/03/2015] [Indexed: 12/18/2022]
Abstract
The methods of cell detachment influence phenotype and function of human macrophages cultured in vitro. However, comparative studies defining the influence of cell detachment techniques on secondary characterization of M1 or M2 polarized macrophages are largely absent from the literature. In this study we evaluated the impact of trypsin, accutase, EDTA, PBS, and cell scraping on: A. cell recovery, B. phenotype and C. function of in vitro polarized macrophages. Our data demonstrate that while exposure to trypsin or accutase yields highly efficient recovery of viable cells, such chemical cleavage results in loss of select M2 cell surface markers with correlative changes in cell function. In contrast, phenotype and function are maintained following detachment by EDTA on ice. Our data suggest that seemingly "trivial" changes in methodologies for macrophage detachment induce both variable and profound changes on cell phenotype and function which can dramatically impact the results of polarization experiments.
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Affiliation(s)
- Shaodong Chen
- Department of Otorhinolaryngology-Head and Neck Surgery, University of Maryland School of Medicine, USA; Medical College of Xiamen University, China.
| | - Edward C So
- Department of Otorhinolaryngology-Head and Neck Surgery, University of Maryland School of Medicine, USA.
| | - Scott E Strome
- Department of Otorhinolaryngology-Head and Neck Surgery, University of Maryland School of Medicine, USA.
| | - Xiaoyu Zhang
- Department of Otorhinolaryngology-Head and Neck Surgery, University of Maryland School of Medicine, USA.
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