1
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Stehnach MR, Henshaw RJ, Floge SA, Guasto JS. Multiplexed microfluidic screening of bacterial chemotaxis. eLife 2023; 12:e85348. [PMID: 37486823 PMCID: PMC10365836 DOI: 10.7554/elife.85348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Accepted: 06/15/2023] [Indexed: 07/26/2023] Open
Abstract
Microorganism sensing of and responding to ambient chemical gradients regulates a myriad of microbial processes that are fundamental to ecosystem function and human health and disease. The development of efficient, high-throughput screening tools for microbial chemotaxis is essential to disentangling the roles of diverse chemical compounds and concentrations that control cell nutrient uptake, chemorepulsion from toxins, and microbial pathogenesis. Here, we present a novel microfluidic multiplexed chemotaxis device (MCD) which uses serial dilution to simultaneously perform six parallel bacterial chemotaxis assays that span five orders of magnitude in chemostimulant concentration on a single chip. We first validated the dilution and gradient generation performance of the MCD, and then compared the measured chemotactic response of an established bacterial chemotaxis system (Vibrio alginolyticus) to a standard microfluidic assay. Next, the MCD's versatility was assessed by quantifying the chemotactic responses of different bacteria (Psuedoalteromonas haloplanktis, Escherichia coli) to different chemoattractants and chemorepellents. The MCD vastly accelerates the chemotactic screening process, which is critical to deciphering the complex sea of chemical stimuli underlying microbial responses.
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Affiliation(s)
- Michael R Stehnach
- Department of Mechanical Engineering, Tufts University, Medford, United States
| | - Richard J Henshaw
- Department of Mechanical Engineering, Tufts University, Medford, United States
| | - Sheri A Floge
- Department of Biology, Wake Forest University, Winston-Salem, United States
| | - Jeffrey S Guasto
- Department of Mechanical Engineering, Tufts University, Medford, United States
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2
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de Graaf MNS, Vivas A, Kasi DG, van den Hil FE, van den Berg A, van der Meer AD, Mummery CL, Orlova VV. Multiplexed fluidic circuit board for controlled perfusion of 3D blood vessels-on-a-chip. LAB ON A CHIP 2022; 23:168-181. [PMID: 36484766 PMCID: PMC9764810 DOI: 10.1039/d2lc00686c] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Accepted: 10/21/2022] [Indexed: 06/11/2023]
Abstract
Three-dimensional (3D) blood vessels-on-a-chip (VoC) models integrate the biological complexity of vessel walls with dynamic microenvironmental cues, such as wall shear stress (WSS) and circumferential strain (CS). However, these parameters are difficult to control and are often poorly reproducible due to the high intrinsic diameter variation of individual 3D-VoCs. As a result, the throughput of current 3D systems is one-channel-at-a-time. Here, we developed a fluidic circuit board (FCB) for simultaneous perfusion of up to twelve 3D-VoCs using a single set of control parameters. By designing the internal hydraulic resistances in the FCB appropriately, it was possible to provide a pre-set WSS to all connected 3D-VoCs, despite significant variation in lumen diameters. Using this FCB, we found that variation of CS or WSS induce morphological changes to human induced pluripotent stem cell (hiPSC)-derived endothelial cells (ECs) and conclude that control of these parameters using a FCB is necessary to study 3D-VOCs.
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Affiliation(s)
- Mees N S de Graaf
- Department of Anatomy and Embryology, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands.
| | - Aisen Vivas
- Applied Stem Cell Technologies, University of Twente, 7500AE Enschede, The Netherlands
- BIOS Lab on a Chip Group, MESA+ Institute for Nanotechnology, Technical Medical Centre, Max Planck Institute for Complex Fluid Dynamics, University of Twente, 7500AE Enschede, The Netherlands
| | - Dhanesh G Kasi
- Department of Anatomy and Embryology, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands.
- Department of Human Genetics, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
- Department of Neurology, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
| | - Francijna E van den Hil
- Department of Anatomy and Embryology, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands.
| | - Albert van den Berg
- BIOS Lab on a Chip Group, MESA+ Institute for Nanotechnology, Technical Medical Centre, Max Planck Institute for Complex Fluid Dynamics, University of Twente, 7500AE Enschede, The Netherlands
| | | | - Christine L Mummery
- Department of Anatomy and Embryology, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands.
- Applied Stem Cell Technologies, University of Twente, 7500AE Enschede, The Netherlands
| | - Valeria V Orlova
- Department of Anatomy and Embryology, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands.
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3
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Shi H, Xie Z, Cao Y, Zhao Y, Zhang C, Chen Z, Reis NM, Liu Z. A microfluidic serial dilutor (MSD): Design optimization and application to tuning of liposome nanoparticle preparation. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.118080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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4
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Shahrivari S, Aminoroaya N, Ghods R, Latifi H, Afjei SA, Saraygord-Afshari N, Bagheri Z. Toxicity of trastuzumab for breast cancer spheroids: Application of a novel on-a-chip concentration gradient generator. Biochem Eng J 2022. [DOI: 10.1016/j.bej.2022.108590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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5
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Chen C, Li P, Guo T, Chen S, Xu D, Chen H. Generation of Dynamic Concentration Profile Using A Microfluidic Device Integrating Pneumatic Microvalves. BIOSENSORS 2022; 12:bios12100868. [PMID: 36291005 PMCID: PMC9599525 DOI: 10.3390/bios12100868] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 10/08/2022] [Accepted: 10/09/2022] [Indexed: 06/12/2023]
Abstract
Generating and maintaining the concentration dilutions of diffusible molecules in microchannels is critical for high-throughput chemical and biological analysis. Conventional serial network microfluidic technologies can generate high orders of arbitrary concentrations by a predefined microchannel network. However, a previous design requires a large occupancy area and is unable to dynamically generate different profiles in the same chip, limiting its applications. This study developed a microfluidic device enabling dynamic variations of both the concentration in the same channel and the concentration distribution in multiple channels by adjusting the flow resistance using programmable pneumatic microvalves. The key component (the pneumatic microvalve) allowed dynamic adjustment of the concentration profile but occupied a tiny space. Additionally, a Matlab program was developed to calculate the flow rates and flow resistance of various sections of the device, which provided theoretical guidance for dimension design. In silico investigations were conducted to evaluate the microvalve deformation with widths from 100 to 300 µm and membrane thicknesses of 20 and 30 µm under the activation pressures between 0 and 2000 mbar. The flow resistance of the deformed valve was studied both numerically and experimentally and an empirical model for valve flow resistance with the form of Rh=aebP was proposed. Afterward, the fluid flow in the valve region was characterized using Micro PIV to further demonstrate the adjustment mechanism of the flow resistance. Then, the herringbone structures were employed for fast mixing to allow both quick variation of concentration and minor space usage of the channel network. Finally, an empirical formula-supported computational program was developed to provide the activation pressures required for the specific concentration profile. Both linear (Ck = -0.2k + 1) and nonlinear (Ck = (110)k) concentration distribution in four channels were varied using the same device by adjusting microvalves. The device demonstrated the capability to control the concentration profile dynamically in a small space, offering superior application potentials in analytical chemistry, drug screening, and cell biology research.
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Affiliation(s)
- Chang Chen
- School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen 518055, China
| | - Panpan Li
- School of Science, Harbin Institute of Technology, Shenzhen 518055, China
| | - Tianruo Guo
- Graduate School of Biomedical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
| | - Siyuan Chen
- School of Science, Harbin Institute of Technology, Shenzhen 518055, China
| | - Dong Xu
- School of Science, Harbin Institute of Technology, Shenzhen 518055, China
| | - Huaying Chen
- School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen 518055, China
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6
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Kim S, Song J, Kim R, Lee NY, Kim MH, Park HG. Ferrowax microvalves for fully automated serial dilution on centrifugal microfluidic platforms. Biotechnol J 2021; 16:e2100131. [PMID: 34499815 DOI: 10.1002/biot.202100131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 09/06/2021] [Accepted: 09/07/2021] [Indexed: 11/07/2022]
Abstract
We herein describe a centrifugal microfluidic system to accomplish a fully automated serial dilution. The liquid flow on the disc was regulated by utilizing ferrowax microvalves systematically integrated into the channels within specially designed metering structures. By opening the differently positioned microvalves through irradiation of IR laser to allow metering, the same amount of diluent was serially eluted to the dilution chamber from the same diluent chamber. After dilution, the diluted samples were automatically delivered to the respective final product chambers by appropriately opening or closing the microvalves in the connecting channels, followed by rotating the disc. Based on this unique design principle, six consecutive two-fold and 10-fold dilutions were successfully achieved, yielding excellent accuracy in a wide dynamic range up to six orders of magnitude. Very importantly, the overall serial dilution process, including the diluent addition, mixing, and product transfer steps, was completed very rapidly within 5 min, due to the minimized procedures enabled by the automated actuation of the ferrowax microvalves at the rationally designed positions. We expect our centrifugal microfluidic system would serve as a powerful elemental tool to realize fully automated diagnostic microsystems involving the serial dilution process.
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Affiliation(s)
- Soohyun Kim
- Department of Chemical and Biomolecular Engineering (BK21+ Program), Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
| | - Jayeon Song
- Department of Chemical and Biomolecular Engineering (BK21+ Program), Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
| | - RaKyeom Kim
- Department of Chemical and Biomolecular Engineering (BK21+ Program), Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
- Department of BioNano Technology, Gachon University, Gyeonggi-do, Republic of Korea
| | - Nae Yoon Lee
- Department of BioNano Technology, Gachon University, Gyeonggi-do, Republic of Korea
| | | | - Hyun Gyu Park
- Department of Chemical and Biomolecular Engineering (BK21+ Program), Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
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7
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Zeraatkar M, de Tullio MD, Percoco G. Fused Filament Fabrication (FFF) for Manufacturing of Microfluidic Micromixers: An Experimental Study on the Effect of Process Variables in Printed Microfluidic Micromixers. MICROMACHINES 2021; 12:mi12080858. [PMID: 34442481 PMCID: PMC8399612 DOI: 10.3390/mi12080858] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2021] [Revised: 07/16/2021] [Accepted: 07/19/2021] [Indexed: 12/13/2022]
Abstract
The need for accessible and inexpensive microfluidic devices requires new manufacturing methods and materials as a replacement for traditional soft lithography and polydimethylsiloxane (PDMS). Recently, with the advent of modern additive manufacturing (AM) techniques, 3D printing has attracted attention for its use in the fabrication of microfluidic devices and due to its automated, assembly-free 3D fabrication, rapidly decreasing cost, and fast-improving resolution and throughput. Here, fused filament fabrication (FFF) 3D printing was used to create microfluidic micromixers and enhance the mixing process, which has been identified as a challenge in microfluidic devices. A design of experiment (DoE) was performed on the effects of studied parameters in devices that were printed by FFF. The results of the colorimetric approach showed the effects of different parameters on the mixing process and on the enhancement of the mixing performance in printed devices. The presence of the geometrical features on the microchannels can act as ridges due to the nature of the FFF process. In comparison to passive and active methods, no complexity was added in the fabrication process, and the ridges are an inherent property of the FFF process.
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8
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Nguyen AV, Azizi M, Yaghoobi M, Dogan B, Zhang S, Simpson KW, Abbaspourrad A. Diffusion-Convection Hybrid Microfluidic Platform for Rapid Antibiotic Susceptibility Testing. Anal Chem 2021; 93:5789-5796. [PMID: 33788554 DOI: 10.1021/acs.analchem.0c05248] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Conventional antibiotic susceptibility testing (AST) assays such as broth microdilution and Kirby-Bauer disk diffusion are time-consuming (e.g., 24-72 h) and labor-intensive. Here, we present a microfluidic platform to perform AST assays with a broad range of antibiotic concentrations and controls. A culture medium stream was serially enriched with antibiotics along the length of the platform via diffusion and flow-directing mass convection mechanisms, generating a concentration gradient captured in a series of microchamber duplicates. We observed an agreement between the simulated and experimental concentration gradients and applicability to a variety of different molecules by changing the loading time according to a simple linear equation. The AST assay in our platform is based on bacterial metabolism, indicated by resazurin fluorescence. The small reaction volume enabled a minimum inhibitory concentration (MIC) to be determined in 4-5 h. Proof-of-concept functionality testing, using human isolates and clinically important antibiotics from different classes, indicated a high rate of agreement (94%: MIC within ±1 two-fold dilution of the reference method) of on-chip MICs and conventional broth microdilution. Overall, our results showed that this microfluidic platform is capable of determining antibiotic susceptibility in a rapid and reliable manner.
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Affiliation(s)
- Ann V Nguyen
- Department of Food Science, College of Agricultural and Life Sciences, Cornell University, Stocking Hall, Ithaca, New York 14853, United States
| | - Morteza Azizi
- Department of Food Science, College of Agricultural and Life Sciences, Cornell University, Stocking Hall, Ithaca, New York 14853, United States
| | - Mohammad Yaghoobi
- Department of Food Science, College of Agricultural and Life Sciences, Cornell University, Stocking Hall, Ithaca, New York 14853, United States
| | - Belgin Dogan
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, 602 Tower Rd., Ithaca, New York 14853, United States
| | - Shiying Zhang
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, 602 Tower Rd., Ithaca, New York 14853, United States
| | - Kenneth W Simpson
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, 602 Tower Rd., Ithaca, New York 14853, United States
| | - Alireza Abbaspourrad
- Department of Food Science, College of Agricultural and Life Sciences, Cornell University, Stocking Hall, Ithaca, New York 14853, United States
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9
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Rho HS, Yang Y, Terstappen LW, Gardeniers H, Le Gac S, Habibović P. Programmable droplet-based microfluidic serial dilutor. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2020.08.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Jaberi A, Esfahani AM, Aghabaglou F, Park JS, Ndao S, Tamayol A, Yang R. Microfluidic Systems with Embedded Cell Culture Chambers for High-Throughput Biological Assays. ACS APPLIED BIO MATERIALS 2020; 3:6661-6671. [PMID: 35019392 PMCID: PMC10081828 DOI: 10.1021/acsabm.0c00439] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The ability to generate chemical and mechanical gradients on chips is important for either creating biomimetic designs or enabling high-throughput assays. However, there is still a significant knowledge gap in the generation of mechanical and chemical gradients in a single device. In this study, we developed gradient-generating microfluidic circuits with integrated microchambers to allow cell culture and to introduce chemical and mechanical gradients to cultured cells. A chemical gradient is generated across the microchambers, exposing cells to a uniform concentration of drugs. The embedded microchamber also produces a mechanical gradient in the form of varied shear stresses induced upon cells among different chambers as well as within the same chamber. Cells seeded within the chambers remain viable and show a normal morphology throughout the culture time. To validate the effect of different drug concentrations and shear stresses, doxorubicin is flowed into chambers seeded with skin cancer cells at different flow rates (from 0 to 0.2 μL/min). The experimental results show that increasing doxorubicin concentration (from 0 to 30 μg/mL) within chambers not only prohibits cell growth but also induces cell death. In addition, the increased shear stress (0.005 Pa) at high flow rates poses a synergistic effect on cell viability by inducing cell damage and detachment. Moreover, the ability of the device to seed cells in a 3D microenvironment was also examined and confirmed. Collectively, the study demonstrates the potential of microchamber-embedded microfluidic gradient generators in 3D cell culture and high-throughput drug screening.
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Affiliation(s)
- Arian Jaberi
- Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, NE 68588, USA
| | - Amir Monemian Esfahani
- Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, NE 68588, USA
| | - Fariba Aghabaglou
- Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, NE 68588, USA
| | - Jae Sung Park
- Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, NE 68588, USA
| | - Sidy Ndao
- Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, NE 68588, USA
| | - Ali Tamayol
- Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, NE 68588, USA
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA
| | - Ruiguo Yang
- Department of Mechanical and Materials Engineering, University of Nebraska, Lincoln, NE 68588, USA
- Nebraska Center for Integrated Biomolecular Communications (NCIBC), University of Nebraska-Lincoln, Lincoln, NE 68516, USA
- Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE 68198, USA
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11
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Bliese S, O’Donnell D, Weaver AA, Lieberman M. Paper Millifluidics Lab: Using a Library of Color Tests to Find Adulterated Antibiotics. JOURNAL OF CHEMICAL EDUCATION 2020; 97:786-792. [PMID: 32174646 PMCID: PMC7066646 DOI: 10.1021/acs.jchemed.9b00433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Revised: 01/23/2020] [Indexed: 06/10/2023]
Abstract
A two to three period analytical chemistry experiment has been developed which allows second year students to explore chemical color tests used to detect adulterated pharmaceuticals. Students prepare several paper analytical devices (PADs) to generate positive and negative controls antibiotics, along with cutting agents such as starch and chalk. These PADs are used to identify the active ingredients and excipients in mystery tablets prepared by their classmates. In the second part of the lab, the students select an individual color test and design an experiment to quantify their mystery pill's active pharmaceutical ingredient (API). Nearly all of the student groups were able to successfully identify adulterants present in their mystery tablets. The quantification of the mystery tablets was also successful with all but one group calculating the correct concentration within 6%. In a postlab assessment, the students identified their largest gains in their ability to analyze data and other information, skill in science writing, and learning of laboratory techniques.
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Affiliation(s)
- Sarah
L. Bliese
- Chemistry
and Biochemistry Department, University
of Notre Dame, Notre
Dame, Indiana 46556, United States
| | - Deanna O’Donnell
- Chemistry
Department, Hamline University, St. Paul, Minnesota 55104, United States
| | - Abigail A. Weaver
- Civil
& Environmental Engineering & Earth Sciences Department, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Marya Lieberman
- Chemistry
and Biochemistry Department, University
of Notre Dame, Notre
Dame, Indiana 46556, United States
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12
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Liu W, Sun M, Han K, Wang J. Large-Scale Antitumor Screening Based on Heterotypic 3D Tumors Using an Integrated Microfluidic Platform. Anal Chem 2019; 91:13601-13610. [DOI: 10.1021/acs.analchem.9b02768] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Wenming Liu
- Departments of Biomedical Engineering and Pathology, School of Basic Medical Science, Central South University, Changsha, Hunan 410013, China
- Department of Chemistry, College of Chemistry and Pharmacy, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Meilin Sun
- Departments of Biomedical Engineering and Pathology, School of Basic Medical Science, Central South University, Changsha, Hunan 410013, China
| | - Kai Han
- Departments of Biomedical Engineering and Pathology, School of Basic Medical Science, Central South University, Changsha, Hunan 410013, China
| | - Jinyi Wang
- Department of Chemistry, College of Chemistry and Pharmacy, Northwest A&F University, Yangling, Shaanxi 712100, China
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13
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Juelg P, Specht M, Kipf E, Lehnert M, Eckert C, Keller M, Hutzenlaub T, von Stetten F, Zengerle R, Paust N. Automated serial dilutions for high-dynamic-range assays enabled by fill-level-coupled valving in centrifugal microfluidics. LAB ON A CHIP 2019; 19:2205-2219. [PMID: 31139783 DOI: 10.1039/c9lc00092e] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We introduce a new concept for centrifugal microfluidics that enables fully automated serial dilution generation without any additional means besides temperature control. The key feature is time-independent, serial valving of mixing chambers by fill-level-coupled temperature change rate (FLC-TCR) actuated valving. The automated dilution is realized under continuous rotation which enables reliable control of wetting liquids without the need for any additional fabrication steps such as hydrophobic coating. All fluidic features are implemented in a monolithic fashion and disks are manufactured by foil thermoforming for scalable manufacturing. The new valving concept is demonstrated to reliably prevent valving if the diluted sample is not added to the mixing chamber (n = 30) and ensure valving if the dilution stage is completed (n = 15). The accuracy and precision of automated serial dilutions are verified by on-disk generation of qPCR standard curve dilutions and compared with manually generated reference dilutions. In a first step, the 5-log-stage standard curves are evaluated in a commercial qPCR thermocycler revealing a linearity of R2 ≥ 99.92% for the proposed LabDisk method vs. R2 ≥ 99.67% in manual reference dilutions. In a second step, the disk automated serial dilutions are combined with on-disk qPCR thermocycling and readout, both inside a LabDisk player. A 4-log-stage linearity of R2 ≥ 99.81% and a sensitivity of one leukemia associated ETV6-RUNX1 mutant DNA copy in a background of 100 000 wild-type DNA copies are achieved.
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Affiliation(s)
- Peter Juelg
- Hahn-Schickard, Georges-Koehler-Allee 103, 79110 Freiburg, Germany.
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14
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Desyatnik I, Krasner M, Frolov L, Ronen M, Guy O, Wasserman D, Tzur A, Avrahami D, Barbiro-Michaely E, Gerber D. An Integrated Microfluidics Approach for Personalized Cancer Drug Sensitivity and Resistance Assay. ACTA ACUST UNITED AC 2019; 3:e1900001. [PMID: 32648689 DOI: 10.1002/adbi.201900001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2019] [Revised: 04/04/2019] [Indexed: 12/22/2022]
Abstract
Cancer is the second leading cause of death globally. Matching proper treatment and dosage is crucial for a positive outcome. Any given drug may affect patients with similar tumors differently. Personalized medicine aims to address this issue. Unfortunately, most cancer samples cannot be expanded in culture, limiting conventional cell-based testing. Herein, presented is a microfluidic device that combines a drug microarray with cell microscopy. The device can perform 512 experiments to test chemosensitivity and resistance to a drug array. MCF7 and 293T cells are cultured inside the device and their chemosensitivity and resistance to docetaxel, applied at various concentrations, are determined. Cell mortality is determined as a function of drug concentration and exposure time. It is found that both cell types form cluster morphology within the device, not evident in conventional tissue culture under similar conditions. Cells inside the clusters are less sensitive to drugs than dispersed cells. These findings support a heterogenous response of cancer cells to drugs. Then demonstrated is the principle of drug microarrays by testing cell response to four different drugs at four different concentrations. This approach may enable the personalization of treatment to the particular tumor and patient and may eventually improve final patient outcome.
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Affiliation(s)
- Inna Desyatnik
- The Mina & Everard Goodman Faculty of Life Sciences and the Institute for Nanotechnology and Advanced Materials, Bar Ilan University, Ramat Gan, 52900, Israel
| | - Matan Krasner
- The Mina & Everard Goodman Faculty of Life Sciences and the Institute for Nanotechnology and Advanced Materials, Bar Ilan University, Ramat Gan, 52900, Israel
| | - Ludmila Frolov
- The Mina & Everard Goodman Faculty of Life Sciences and the Institute for Nanotechnology and Advanced Materials, Bar Ilan University, Ramat Gan, 52900, Israel
| | - Maria Ronen
- The Mina & Everard Goodman Faculty of Life Sciences and the Institute for Nanotechnology and Advanced Materials, Bar Ilan University, Ramat Gan, 52900, Israel
| | - Ortal Guy
- The Mina & Everard Goodman Faculty of Life Sciences and the Institute for Nanotechnology and Advanced Materials, Bar Ilan University, Ramat Gan, 52900, Israel
| | - Danit Wasserman
- The Mina & Everard Goodman Faculty of Life Sciences and the Institute for Nanotechnology and Advanced Materials, Bar Ilan University, Ramat Gan, 52900, Israel
| | - Amit Tzur
- The Mina & Everard Goodman Faculty of Life Sciences and the Institute for Nanotechnology and Advanced Materials, Bar Ilan University, Ramat Gan, 52900, Israel
| | - Dorit Avrahami
- The Mina & Everard Goodman Faculty of Life Sciences and the Institute for Nanotechnology and Advanced Materials, Bar Ilan University, Ramat Gan, 52900, Israel
| | - Efrat Barbiro-Michaely
- The Mina & Everard Goodman Faculty of Life Sciences and the Institute for Nanotechnology and Advanced Materials, Bar Ilan University, Ramat Gan, 52900, Israel
| | - Doron Gerber
- The Mina & Everard Goodman Faculty of Life Sciences and the Institute for Nanotechnology and Advanced Materials, Bar Ilan University, Ramat Gan, 52900, Israel
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15
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Cui P, Wang S. Application of microfluidic chip technology in pharmaceutical analysis: A review. J Pharm Anal 2018; 9:238-247. [PMID: 31452961 PMCID: PMC6704040 DOI: 10.1016/j.jpha.2018.12.001] [Citation(s) in RCA: 144] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 11/29/2018] [Accepted: 12/04/2018] [Indexed: 01/18/2023] Open
Abstract
The development of pharmaceutical analytical methods represents one of the most significant aspects of drug development. Recent advances in microfabrication and microfluidics could provide new approaches for drug analysis, including drug screening, active testing and the study of metabolism. Microfluidic chip technologies, such as lab-on-a-chip technology, three-dimensional (3D) cell culture, organs-on-chip and droplet techniques, have all been developed rapidly. Microfluidic chips coupled with various kinds of detection techniques are suitable for the high-throughput screening, detection and mechanistic study of drugs. This review highlights the latest (2010–2018) microfluidic technology for drug analysis and discusses the potential future development in this field.
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Affiliation(s)
- Ping Cui
- School of Pharmacy, Xi'an Jiaotong University Health Science Center, #76, Yanta West Road, Xi'an 710061, China.,Shaanxi Engineering Research Center of Cardiovascular Drugs Screening & Analysis, Xi'an 710061, China
| | - Sicen Wang
- School of Pharmacy, Xi'an Jiaotong University Health Science Center, #76, Yanta West Road, Xi'an 710061, China.,Shaanxi Engineering Research Center of Cardiovascular Drugs Screening & Analysis, Xi'an 710061, China
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16
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Hirama H, Satoh T, Sugiura S, Shin K, Onuki-Nagasaki R, Kanamori T, Inoue T. Glass-based organ-on-a-chip device for restricting small molecular absorption. J Biosci Bioeng 2018; 127:641-646. [PMID: 30473393 DOI: 10.1016/j.jbiosc.2018.10.019] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Revised: 10/04/2018] [Accepted: 10/26/2018] [Indexed: 12/17/2022]
Abstract
The use of organ-on-a-chip (OOC) devices is a promising alternative to existing cell-based assays and animal testing in drug discovery. A rapid prototyping method with polydimethylsiloxane (PDMS) is widely used for developing OOC devices. However, because PDMS tends to absorb small hydrophobic molecules, the loss of test compounds in cell-based assays and increases in background fluorescence during observation often lead to biased results in cell-based assays. To address this issue, we have fabricated a glass-based OOC device and characterized the medium flow and molecular absorption properties in comparison with PDMS-based devices. Consequently, we revealed that the glass device generated a stable medium flow, restricted the absorption of small hydrophobic molecules, and showed enhanced cell adhesiveness. This glass device is expected to be applicable to precise cell-based assays to evaluate small hydrophobic molecules, for which PDMS devices cannot be applied because of their absorption of small hydrophobic molecules.
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Affiliation(s)
- Hirotada Hirama
- Research Center for Ubiquitous MEMS and Micro Engineering, National Institute of Advanced Industrial Science and Technology, 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564, Japan.
| | - Taku Satoh
- Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Shinji Sugiura
- Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Kazumi Shin
- Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Reiko Onuki-Nagasaki
- Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Toshiyuki Kanamori
- Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Tomoya Inoue
- Research Center for Ubiquitous MEMS and Micro Engineering, National Institute of Advanced Industrial Science and Technology, 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564, Japan
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17
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Beckham J, Alam F, Omojola V, Scherr T, Guitreau A, Melvin A, Park DS, Choi JW, Tiersch TR, Todd Monroe W. A microfluidic device for motility and osmolality analysis of zebrafish sperm. Biomed Microdevices 2018; 20:67. [PMID: 30090952 PMCID: PMC6600829 DOI: 10.1007/s10544-018-0308-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
A microfluidic chip is described that facilitates research and quality control analysis of zebrafish sperm which, due to its miniscule (i.e., 2-5 μl) sample volume and short duration of motility (i.e., <1 min), present a challenge for traditional manual assessment methods. A micromixer molded in polydimethylsiloxane (PDMS) bonded to a glass substrate was used to activate sperm samples by mixing with water, initiated by the user depressing a transfer pipette connected to the chip. Sample flow in the microfluidic viewing chamber was able to be halted within 1 s, allowing for rapid analysis of the sample using established computer-assisted sperm analysis (CASA) methods. Zebrafish sperm cell activation was consistent with manual hand mixing and yielded higher values of motility at earlier time points, as well as more subtle time-dependent trends in motility, than those processed by hand. Sperm activation curves, which indicate sample quality by evaluating percentage and duration of motility at various solution osmolalities, were generated with on-chip microfabricated gold floor electrodes interrogated by impedance spectroscopy. The magnitude of admittance was linearly proportional to osmolality and was not affected by the presence of sperm cells in the vicinity of the electrodes. This device represents a pivotal step in streamlining methods for consistent, rapid assessment of sperm quality for aquatic species. The capability to rapidly activate sperm and consistently measure motility with CASA using the microfluidic device described herein will help improve the reproducibility of studies on sperm and assist development of germplasm repositories.
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Affiliation(s)
- Jacob Beckham
- Department of Biological & Agricultural Engineering, Louisiana State University and Agricultural Center, Baton Rouge, LA, USA
| | - Faiz Alam
- Department of Biological & Agricultural Engineering, Louisiana State University and Agricultural Center, Baton Rouge, LA, USA
| | - Victor Omojola
- Department of Biological & Agricultural Engineering, Louisiana State University and Agricultural Center, Baton Rouge, LA, USA
| | - Thomas Scherr
- Department of Chemistry, Vanderbilt University, Nashville, TN, USA
| | - Amy Guitreau
- Aquatic Germplasm and Genetic Resources Center, Louisiana State University Agricultural Center, Baton Rouge, LA, USA
| | - Adam Melvin
- Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA, USA
| | - Daniel S Park
- Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA, USA
| | - Jin-Woo Choi
- School of Electrical Engineering & Computer Science, Louisiana State University, Baton Rouge, LA, USA
| | - Terrence R Tiersch
- Aquatic Germplasm and Genetic Resources Center, Louisiana State University Agricultural Center, Baton Rouge, LA, USA
| | - W Todd Monroe
- Department of Biological & Agricultural Engineering, Louisiana State University and Agricultural Center, Baton Rouge, LA, USA.
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18
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Effects of Pulse Interval and Dosing Flux on Cells Varying the Relative Velocity of Micro Droplets and Culture Solution. Processes (Basel) 2018. [DOI: 10.3390/pr6080119] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Microdroplet dosing to cell on a chip could meet the demand of narrow diffusion distance, controllable pulse dosing and less impact to cells. In this work, we studied the diffusion process of microdroplet cell pulse dosing in the three-layer sandwich structure of PDMS (polydimethylsiloxane)/PCTE (polycarbonate) microporous membrane/PDMS chip. The mathematical model is established to solve the diffusion process and the process of rhodamine transfer to micro-traps is simulated. The rhodamine mass fraction distribution, pressure field and velocity field around the microdroplet and cell surfaces are analyzed for further study of interdiffusion and convective diffusion effect. The cell pulse dosing time and drug delivery efficiency could be controlled by adjusting microdroplet and culture solution velocity without impairing cells at micro-traps. Furthermore, the accuracy and controllability of the cell dosing pulse time and maximum drug mass fraction on cell surfaces are achieved and the drug effect on cells could be analyzed more precisely especially for neuron cell dosing.
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19
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Design keys for paper-based concentration gradient generators. J Chromatogr A 2018; 1561:83-91. [DOI: 10.1016/j.chroma.2018.05.040] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Revised: 05/15/2018] [Accepted: 05/20/2018] [Indexed: 11/19/2022]
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20
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Chadly DM, Oleksijew AM, Coots KS, Fernandez JJ, Kobayashi S, Kessler JA, Matsuoka AJ. Full Factorial Microfluidic Designs and Devices for Parallelizing Human Pluripotent Stem Cell Differentiation. SLAS Technol 2018; 24:41-54. [PMID: 29995450 DOI: 10.1177/2472630318783497] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Human pluripotent stem cells (hPSCs) are promising therapeutic tools for regenerative therapies and disease modeling. Differentiation of cultured hPSCs is influenced by both exogenous factors added to the cultures and endogenously secreted molecules. Optimization of protocols for the differentiation of hPSCs into different cell types is difficult because of the many variables that can influence cell fate. We present microfluidic devices designed to perform three- and four-factor, two-level full factorial experiments in parallel for investigating and directly optimizing hPSC differentiation. These devices feature diffusion-isolated, independent culture wells that allow for control of both exogenous and endogenous cellular signals and that allow for immunocytochemistry (ICC) and confocal microscopy in situ. These devices are fabricated by soft lithography in conjunction with 3D-printed molds and are operable with a single syringe pump, eliminating the need for specialized equipment or cleanroom facilities. Their utility was demonstrated by on-chip differentiation of hPSCs into the auditory neuron lineage. More broadly, these devices enable multiplexing for experimentation with any adherent cell type or even multiple cell types, allowing efficient investigation of the effects of medium conditions, pharmaceuticals, or other soluble reagents.
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Affiliation(s)
- Duncan M Chadly
- 1 Department of Otolaryngology and Head and Neck Surgery, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Andrew M Oleksijew
- 1 Department of Otolaryngology and Head and Neck Surgery, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Kyle S Coots
- 1 Department of Otolaryngology and Head and Neck Surgery, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Jose J Fernandez
- 2 Department of Chemical and Biological Engineering, McCormick School of Engineering, Northwestern University, Evanston, IL, USA
| | - Shun Kobayashi
- 1 Department of Otolaryngology and Head and Neck Surgery, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - John A Kessler
- 3 Department of Neurology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Akihiro J Matsuoka
- 1 Department of Otolaryngology and Head and Neck Surgery, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.,4 Roxelyn and Richard Pepper Department of Communication Sciences and Disorders, School of Communication, Northwestern University, Evanston, IL, USA.,5 Hugh Knowles Center for Hearing Research, Northwestern University, Evanston, IL, USA
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21
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Satoh T, Sugiura S, Shin K, Onuki-Nagasaki R, Ishida S, Kikuchi K, Kakiki M, Kanamori T. A multi-throughput multi-organ-on-a-chip system on a plate formatted pneumatic pressure-driven medium circulation platform. LAB ON A CHIP 2017; 18:115-125. [PMID: 29184959 DOI: 10.1039/c7lc00952f] [Citation(s) in RCA: 97] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
This paper reports a multi-throughput multi-organ-on-a-chip system formed on a pneumatic pressure-driven medium circulation platform with a microplate-sized format as a novel type of microphysiological system. The pneumatic pressure-driven platform enabled parallelized multi-organ experiments (i.e. simultaneous operation of multiple multi-organ culture units) and pipette-friendly liquid handling for various conventional cell culture experiments, including cell seeding, medium change, live/dead staining, cell growth analysis, gene expression analysis of collected cells, and liquid chromatography-mass spectrometry analysis of chemical compounds in the culture medium. An eight-throughput two-organ system and a four-throughput four-organ system were constructed on a common platform, with different microfluidic plates. The two-organ system, composed of liver and cancer models, was used to demonstrate the effect of an anticancer prodrug, capecitabine (CAP), whose metabolite 5-fluorouracil (5-FU) after metabolism by HepaRG hepatic cells inhibited the proliferation of HCT-116 cancer cells. The four-organ system, composed of intestine, liver, cancer, and connective tissue models, was used to demonstrate evaluation of the effects of 5-FU and two prodrugs of 5-FU (CAP and tegafur) on multiple organ models, including cancer and connective tissue.
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Affiliation(s)
- T Satoh
- Biotechnology Research Institute for Drug Discovery, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan.
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22
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Li F, Macdonald NP, Guijt RM, Breadmore MC. Using Printing Orientation for Tuning Fluidic Behavior in Microfluidic Chips Made by Fused Deposition Modeling 3D Printing. Anal Chem 2017; 89:12805-12811. [DOI: 10.1021/acs.analchem.7b03228] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
| | | | - Rosanne M. Guijt
- Centre
for Rural and Regional Futures, Deakin University, Geelong, Private Bag
20000, 3220 Geelong, Australia
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23
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Wang X, Liu Z, Pang Y. Concentration gradient generation methods based on microfluidic systems. RSC Adv 2017. [DOI: 10.1039/c7ra04494a] [Citation(s) in RCA: 113] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Various concentration gradient generation methods based on microfluidic systems are summarized in this paper.
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Affiliation(s)
- Xiang Wang
- College of Mechanical Engineering and Applied Electronics Technology
- Beijing University of Technology
- Beijing 100124
- China
| | - Zhaomiao Liu
- College of Mechanical Engineering and Applied Electronics Technology
- Beijing University of Technology
- Beijing 100124
- China
| | - Yan Pang
- College of Mechanical Engineering and Applied Electronics Technology
- Beijing University of Technology
- Beijing 100124
- China
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24
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Aminian M, Bernardi F, Camassa R, Harris DM, McLaughlin RM. How boundaries shape chemical delivery in microfluidics. Science 2016; 354:1252-1256. [DOI: 10.1126/science.aag0532] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Revised: 06/22/2016] [Accepted: 10/20/2016] [Indexed: 11/02/2022]
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25
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Chen Z, Li W, Choi G, Yang X, Miao J, Cui L, Guan W. Arbitrarily Accessible 3D Microfluidic Device for Combinatorial High-Throughput Drug Screening. SENSORS (BASEL, SWITZERLAND) 2016; 16:E1616. [PMID: 27690055 PMCID: PMC5087404 DOI: 10.3390/s16101616] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 09/19/2016] [Accepted: 09/23/2016] [Indexed: 12/30/2022]
Abstract
Microfluidics-based drug-screening systems have enabled efficient and high-throughput drug screening, but their routine uses in ordinary labs are limited due to the complexity involved in device fabrication and system setup. In this work, we report an easy-to-use and low-cost arbitrarily accessible 3D microfluidic device that can be easily adopted by various labs to perform combinatorial assays for high-throughput drug screening. The device is capable of precisely performing automatic and simultaneous reagent loading and aliquoting tasks and performing multistep assays with arbitrary sequences. The device is not intended to compete with other microfluidic technologies regarding ultra-low reaction volume. Instead, its freedom from tubing or pumping systems and easy operation makes it an ideal platform for routine high-throughput drug screening outside traditional microfluidic labs. The functionality and quantitative reliability of the 3D microfluidic device were demonstrated with a histone acetyltransferase-based drug-screening assay using the recombinant Plasmodium falciparum GCN5 enzyme, benchmarked with a traditional microtiter plate-based method. This arbitrarily accessible, multistep capable, low-cost, and easy-to-use device can be widely adopted in various combinatorial assays beyond high-throughput drug screening.
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Affiliation(s)
- Zhuofa Chen
- Department of Electrical Engineering, Pennsylvania State University, University Park, PA 16802, USA.
| | - Weizhi Li
- Department of Entomology, Pennsylvania State University, University Park, PA 16802, USA.
| | - Gihoon Choi
- Department of Electrical Engineering, Pennsylvania State University, University Park, PA 16802, USA.
| | - Xiaonan Yang
- Department of Electrical Engineering, Pennsylvania State University, University Park, PA 16802, USA.
| | - Jun Miao
- Department of Entomology, Pennsylvania State University, University Park, PA 16802, USA.
| | - Liwang Cui
- Department of Entomology, Pennsylvania State University, University Park, PA 16802, USA.
| | - Weihua Guan
- Department of Electrical Engineering, Pennsylvania State University, University Park, PA 16802, USA.
- Department of Biomedical Engineering, Pennsylvania State University, University Park, PA 16802, USA.
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26
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Norouzi N, Bhakta HC, Grover WH. Orientation-Based Control of Microfluidics. PLoS One 2016; 11:e0149259. [PMID: 26950700 PMCID: PMC4780784 DOI: 10.1371/journal.pone.0149259] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Accepted: 01/13/2016] [Indexed: 11/18/2022] Open
Abstract
Most microfluidic chips utilize off-chip hardware (syringe pumps, computer-controlled solenoid valves, pressure regulators, etc.) to control fluid flow on-chip. This expensive, bulky, and power-consuming hardware severely limits the utility of microfluidic instruments in resource-limited or point-of-care contexts, where the cost, size, and power consumption of the instrument must be limited. In this work, we present a technique for on-chip fluid control that requires no off-chip hardware. We accomplish this by using inert compounds to change the density of one fluid in the chip. If one fluid is made 2% more dense than a second fluid, when the fluids flow together under laminar flow the interface between the fluids quickly reorients to be orthogonal to Earth’s gravitational force. If the channel containing the fluids then splits into two channels, the amount of each fluid flowing into each channel is precisely determined by the angle of the channels relative to gravity. Thus, any fluid can be routed in any direction and mixed in any desired ratio on-chip simply by holding the chip at a certain angle. This approach allows for sophisticated control of on-chip fluids with no off-chip control hardware, significantly reducing the cost of microfluidic instruments in point-of-care or resource-limited settings.
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Affiliation(s)
- Nazila Norouzi
- Department of Bioengineering, University of California, Riverside, Riverside, CA, United States of America
| | - Heran C. Bhakta
- Department of Bioengineering, University of California, Riverside, Riverside, CA, United States of America
| | - William H. Grover
- Department of Bioengineering, University of California, Riverside, Riverside, CA, United States of America
- * E-mail:
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27
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Microfluidics for cell-based high throughput screening platforms - A review. Anal Chim Acta 2015; 903:36-50. [PMID: 26709297 DOI: 10.1016/j.aca.2015.11.023] [Citation(s) in RCA: 158] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 10/04/2015] [Accepted: 11/14/2015] [Indexed: 01/09/2023]
Abstract
In the last decades, the basic techniques of microfluidics for the study of cells such as cell culture, cell separation, and cell lysis, have been well developed. Based on cell handling techniques, microfluidics has been widely applied in the field of PCR (Polymerase Chain Reaction), immunoassays, organ-on-chip, stem cell research, and analysis and identification of circulating tumor cells. As a major step in drug discovery, high-throughput screening allows rapid analysis of thousands of chemical, biochemical, genetic or pharmacological tests in parallel. In this review, we summarize the application of microfluidics in cell-based high throughput screening. The screening methods mentioned in this paper include approaches using the perfusion flow mode, the droplet mode, and the microarray mode. We also discuss the future development of microfluidic based high throughput screening platform for drug discovery.
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28
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Chen H, Sun J, Wolvetang E, Cooper-White J. High-throughput, deterministic single cell trapping and long-term clonal cell culture in microfluidic devices. LAB ON A CHIP 2015; 15:1072-83. [PMID: 25519528 DOI: 10.1039/c4lc01176g] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We report the design and validation of a two-layered microfluidic device platform for single cell capture, culture and clonal expansion. Under manual injection of a cell suspension, deterministic trapping of hundreds to thousands of single cells (adherent and non-adherent) in a high throughput manner and at high trapping efficiency was achieved simply through the incorporation of a U-shaped hydrodynamic trap into the downstream wall of each micro-well. Post single cell trapping, we confirmed that these modified micro-wells permit the attachment, spreading and proliferation of the trapped single cells for multiple generations over extended periods of time (>7 days) under media perfusion. Due to its a) low cost, b) simplicity in fabrication and operation, c) high trapping efficiency, d) reliable and repeatable trapping mechanism, e) cell size selection and f) capability to provide perfused long-term culture and continuous time-lapse imaging, the microfluidic device developed and validated in this study is seen to have significant potential application in high-throughput single cell quality assessment and clonal analysis.
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Affiliation(s)
- Huaying Chen
- Tissue Engineering and Microfluidics Laboratory, Australian Institute for Bioengineering & Nanotechnology, The University of Queensland, St. Lucia, QLD 4072, Australia.
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29
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Shimizu K, Araki H, Sakata K, Tonomura W, Hashida M, Konishi S. Microfluidic devices for construction of contractile skeletal muscle microtissues. J Biosci Bioeng 2015; 119:212-6. [DOI: 10.1016/j.jbiosc.2014.07.003] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Revised: 06/26/2014] [Accepted: 07/07/2014] [Indexed: 01/03/2023]
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30
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Abstract
Microfluidic perfusion culture is a novel technique to culture animal cells in a small-scale microchamber with medium perfusion. Polydimethylsiloxane (PDMS) is the most popular material to fabricate a microfluidic perfusion culture chip. Photolithography and replica molding techniques are generally used for fabrication of a microfluidic perfusion culture chip. Pressure-driven perfusion culture system is convenient technique to carry out the perfusion culture of animal cells in a microfluidic device. Here, we describe a general theory on microfluid network design, microfabrication technique, and experimental technique for pressure-driven perfusion culture in an 8 × 8 microchamber array on a glass slide-sized microchip made out of PDMS.
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Affiliation(s)
- Koji Hattori
- Research Center for Stem Cell Engineering, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan
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31
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Halldorsson S, Lucumi E, Gómez-Sjöberg R, Fleming RMT. Advantages and challenges of microfluidic cell culture in polydimethylsiloxane devices. Biosens Bioelectron 2014; 63:218-231. [PMID: 25105943 DOI: 10.1016/j.bios.2014.07.029] [Citation(s) in RCA: 572] [Impact Index Per Article: 57.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2014] [Revised: 07/03/2014] [Accepted: 07/12/2014] [Indexed: 02/06/2023]
Abstract
Culture of cells using various microfluidic devices is becoming more common within experimental cell biology. At the same time, a technological radiation of microfluidic cell culture device designs is currently in progress. Ultimately, the utility of microfluidic cell culture will be determined by its capacity to permit new insights into cellular function. Especially insights that would otherwise be difficult or impossible to obtain with macroscopic cell culture in traditional polystyrene dishes, flasks or well-plates. Many decades of heuristic optimization have gone into perfecting conventional cell culture devices and protocols. In comparison, even for the most commonly used microfluidic cell culture devices, such as those fabricated from polydimethylsiloxane (PDMS), collective understanding of the differences in cellular behavior between microfluidic and macroscopic culture is still developing. Moving in vitro culture from macroscopic culture to PDMS based devices can come with unforeseen challenges. Changes in device material, surface coating, cell number per unit surface area or per unit media volume may all affect the outcome of otherwise standard protocols. In this review, we outline some of the advantages and challenges that may accompany a transition from macroscopic to microfluidic cell culture. We focus on decisive factors that distinguish macroscopic from microfluidic cell culture to encourage a reconsideration of how macroscopic cell culture principles might apply to microfluidic cell culture.
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Affiliation(s)
- Skarphedinn Halldorsson
- Center for Systems Biology and Biomedical Center, University of Iceland, Sturlugata 8, Reykjavik, Iceland
| | - Edinson Lucumi
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, 7 avenue des Hauts-Fourneaux, Esch-sur-Alzette, Luxembourg
| | - Rafael Gómez-Sjöberg
- Engineering Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, United States of America
| | - Ronan M T Fleming
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, 7 avenue des Hauts-Fourneaux, Esch-sur-Alzette, Luxembourg.
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32
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Meucci S, Travagliati M, Vittorio O, Cirillo G, Masini L, Voliani V, Picci N, Beltram F, Tredicucci A, Cecchini M. Tubeless biochip for chemical stimulation of cells in closed-bioreactors: anti-cancer activity of the catechin–dextran conjugate. RSC Adv 2014. [DOI: 10.1039/c4ra05496b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Here we introduce a tubeless microbioreactor for chemically stimulation of cells in microchambers, based on automatic cell valving, hydrostatic-pressure pumping and on-chip liquid reservoirs.
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Affiliation(s)
- Sandro Meucci
- NEST
- Scuola Normale Superiore and Istituto Nanoscienze-CNR
- Pisa 56127, Italy
- Center for Nanotechnology Innovation@NEST
- Istituto Italiano di Tecnologia
| | - Marco Travagliati
- NEST
- Scuola Normale Superiore and Istituto Nanoscienze-CNR
- Pisa 56127, Italy
- Center for Nanotechnology Innovation@NEST
- Istituto Italiano di Tecnologia
| | - Orazio Vittorio
- NEST
- Scuola Normale Superiore and Istituto Nanoscienze-CNR
- Pisa 56127, Italy
| | - Giuseppe Cirillo
- Department of Pharmacy
- Health and Nutritional Sciences
- University of Calabria
- I-87036 Rende (CS), Italy
- Leibniz Institute for Solid State and Materials Research Dresden
| | - Luca Masini
- NEST
- Scuola Normale Superiore and Istituto Nanoscienze-CNR
- Pisa 56127, Italy
- Center for Nanotechnology Innovation@NEST
- Istituto Italiano di Tecnologia
| | - Valerio Voliani
- NEST
- Scuola Normale Superiore and Istituto Nanoscienze-CNR
- Pisa 56127, Italy
- Center for Nanotechnology Innovation@NEST
- Istituto Italiano di Tecnologia
| | - Nevio Picci
- Department of Pharmacy
- Health and Nutritional Sciences
- University of Calabria
- I-87036 Rende (CS), Italy
| | - Fabio Beltram
- NEST
- Scuola Normale Superiore and Istituto Nanoscienze-CNR
- Pisa 56127, Italy
- Center for Nanotechnology Innovation@NEST
- Istituto Italiano di Tecnologia
| | | | - Marco Cecchini
- NEST
- Scuola Normale Superiore and Istituto Nanoscienze-CNR
- Pisa 56127, Italy
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33
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Zhang Y, Shin DJ, Wang TH. Serial dilution via surface energy trap-assisted magnetic droplet manipulation. LAB ON A CHIP 2013; 13:4827-31. [PMID: 24162777 PMCID: PMC3963271 DOI: 10.1039/c3lc50915j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
This paper demonstrates a facile method of generating precise serial dilutions in the form of droplets on an open surface platform. The method relies on the use of surface energy traps (SETs), etched areas of high surface energy on a Teflon coated glass substrate, to assist in the magnetic manipulation of droplets to meter and dispense liquid of defined volumes for the preparation of serial dilutions. The volume of the dispensed liquid can be precisely controlled by the size of the SETs, facilitating generation of concentration profiles of high linearity. We have applied this approach to the generation of serial dilutions of antibiotics for anti-microbial susceptibility testing (AST).
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Affiliation(s)
- Yi Zhang
- Department of Biomedical Engineering, Johns Hopkins University, 3400 North Charles Street, Clark 122, Baltimore, Maryland, USA.
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Hattori K, Sugiura S, Kanamori T. Pressure-Driven Microfluidic Perfusion Culture Device for Integrated Dose-Response Assays. ACTA ACUST UNITED AC 2013; 18:437-45. [DOI: 10.1177/2211068213503155] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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35
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Hamon M, Hong JW. New tools and new biology: recent miniaturized systems for molecular and cellular biology. Mol Cells 2013; 36:485-506. [PMID: 24305843 PMCID: PMC3887968 DOI: 10.1007/s10059-013-0333-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Accepted: 11/14/2013] [Indexed: 01/09/2023] Open
Abstract
Recent advances in applied physics and chemistry have led to the development of novel microfluidic systems. Microfluidic systems allow minute amounts of reagents to be processed using μm-scale channels and offer several advantages over conventional analytical devices for use in biological sciences: faster, more accurate and more reproducible analytical performance, reduced cell and reagent consumption, portability, and integration of functional components in a single chip. In this review, we introduce how microfluidics has been applied to biological sciences. We first present an overview of the fabrication of microfluidic systems and describe the distinct technologies available for biological research. We then present examples of microsystems used in biological sciences, focusing on applications in molecular and cellular biology.
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Affiliation(s)
- Morgan Hamon
- Materials Research and Education Center, Department of Mechanical Engineering, Auburn University, Auburn, AL 36849,
USA
| | - Jong Wook Hong
- Materials Research and Education Center, Department of Mechanical Engineering, Auburn University, Auburn, AL 36849,
USA
- College of Pharmacy, Seoul National University, Seoul 151-741,
Korea
- Department of Bionano Engineering, Hanyang University, Ansan 426-791,
Korea
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Design, fabrication and characterization of drug delivery systems based on lab-on-a-chip technology. Adv Drug Deliv Rev 2013; 65:1403-19. [PMID: 23726943 DOI: 10.1016/j.addr.2013.05.008] [Citation(s) in RCA: 142] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Revised: 05/16/2013] [Accepted: 05/22/2013] [Indexed: 11/23/2022]
Abstract
Lab-on-a-chip technology is an emerging field evolving from the recent advances of micro- and nanotechnologies. The technology allows the integration of various components into a single microdevice. Microfluidics, the science and engineering of fluid flow in microscale, is the enabling underlying concept for lab-on-a-chip technology. The present paper reviews the design, fabrication and characterization of drug delivery systems based on this amazing technology. The systems are categorized and discussed according to the scales at which the drug is administered. Starting with the fundamentals on scaling laws of mass transfer and basic fabrication techniques, the paper reviews and discusses drug delivery devices for cellular, tissue and organism levels. At the cellular level, a concentration gradient generator integrated with a cell culture platform is the main drug delivery scheme of interest. At the tissue level, the synthesis of smart particles as drug carriers using lab-on-a-chip technology is the main focus of recent developments. At the organism level, microneedles and implantable devices with fluid-handling components are the main drug delivery systems. For drug delivery to a small organism that can fit into a microchip, devices similar to those of cellular level can be used.
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Pethig R. Dielectrophoresis: an assessment of its potential to aid the research and practice of drug discovery and delivery. Adv Drug Deliv Rev 2013; 65:1589-99. [PMID: 24056182 DOI: 10.1016/j.addr.2013.09.003] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Revised: 08/08/2013] [Accepted: 09/11/2013] [Indexed: 02/06/2023]
Abstract
Dielectrophoresis (DEP) is an electrokinetic technique with proven ability to discriminate and selectively manipulate cells based on their phenotype and physiological state, without the need for biological tags and markers. The DEP response of a cell is predominantly determined by the physico-chemical properties of the plasma membrane, subtle changes of which can be detected from two so-called 'cross-over' frequencies, f(xo1) and f(xo2). Membrane capacitance and structural changes can be monitored by measurement of f(xo1) at sub-megahertz frequencies, and current indications suggest that f(xo2), located above 100 MHz, is sensitive to changes of trans-membrane ion fluxes. DEP lends itself to integration in microfluidic devices and can also operate at the nanoscale to manipulate nanoparticles. Apart from measurements of f(xo1) and f(xo2), other examples where DEP could contribute to drug discovery and delivery include its ability to: enrich stem cells according to their differentiation potential, and to engineer artificial cell structures and nano-structures.
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Affiliation(s)
- Ronald Pethig
- Institute for Integrated Micro and Nano Systems, School of Engineering, The University of Edinburgh, Edinburgh EH9 3JF, UK
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38
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Hamon M, Jambovane S, Bradley L, Khademhosseini A, Hong JW. Cell-based dose responses from open-well microchambers. Anal Chem 2013; 85:5249-54. [PMID: 23570236 DOI: 10.1021/ac400743w] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Cell-based assays play a critical role in discovery of new drugs and facilitating research in cancer, immunology, and stem cells. Conventionally, they are performed in Petri dishes, tubes, or well plates, using milliliters of reagents and thousands of cells to obtain one data point. Here, we are introducing a new platform to realize cell-based assay capable of increased throughput and greater sensitivity with a limited number of cells. We integrated an array of open-well microchambers into a gradient generation system. Consequently, cell-based dose responses were examined with a single device. We measured IC50 values of three cytotoxic chemicals, Triton X-100, H2O2, and cadmium chloride, as model compounds. The present system is highly suitable for the discovery of new drugs and studying the effect of chemicals on cell viability or mortality with limited samples and cells.
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Affiliation(s)
- Morgan Hamon
- Materials Research and Education Center, Department of Mechanical Engineering, Auburn University, Auburn, Alabama 36849, United States
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Weibull E, Matsui S, Sakai M, Andersson Svahn H, Ohashi T. Microfluidic device for generating a stepwise concentration gradient on a microwell slide for cell analysis. BIOMICROFLUIDICS 2013; 7:64115. [PMID: 24396549 PMCID: PMC3874052 DOI: 10.1063/1.4846435] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Accepted: 11/28/2013] [Indexed: 05/04/2023]
Abstract
Understanding biomolecular gradients and their role in biological processes is essential for fully comprehending the underlying mechanisms of cells in living tissue. Conventional in vitro gradient-generating methods are unpredictable and difficult to characterize, owing to temporal and spatial fluctuations. The field of microfluidics enables complex user-defined gradients to be generated based on a detailed understanding of fluidic behavior at the μm-scale. By using microfluidic gradients created by flow, it is possible to develop rapid and dynamic stepwise concentration gradients. However, cells exposed to stepwise gradients can be perturbed by signals from neighboring cells exposed to another concentration. Hence, there is a need for a device that generates a stepwise gradient at discrete and isolated locations. Here, we present a microfluidic device for generating a stepwise concentration gradient, which utilizes a microwell slide's pre-defined compartmentalized structure to physically separate different reagent concentrations. The gradient was generated due to flow resistance in the microchannel configuration of the device, which was designed using hydraulic analogy and theoretically verified by computational fluidic dynamics simulations. The device had two reagent channels and two dilutant channels, leading to eight chambers, each containing 4 microwells. A dose-dependency assay was performed using bovine aortic endothelial cells treated with saponin. High reproducibility between experiments was confirmed by evaluating the number of living cells in a live-dead assay. Our device generates a fully mixed fluid profile using a simple microchannel configuration and could be used in various gradient studies, e.g., screening for cytostatics or antibiotics.
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Affiliation(s)
- Emilie Weibull
- Division of Proteomics and Nanobiotechnology, Science for Life Laboratory, KTH-Royal Institute of Technology, 171 65 Stockholm, Sweden
| | - Shunsuke Matsui
- Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
| | - Manabu Sakai
- Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
| | - Helene Andersson Svahn
- Division of Proteomics and Nanobiotechnology, Science for Life Laboratory, KTH-Royal Institute of Technology, 171 65 Stockholm, Sweden
| | - Toshiro Ohashi
- Faculty of Engineering, Hokkaido University, Sapporo Hokkaido 060-8628, Japan
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Hattori K, Yoshimitsu R, Sugiura S, Maruyama A, Ohnuma K, Kanamori T. Masked plasma oxidation: simple micropatterning of extracellular matrix in a closed microchamber array. RSC Adv 2013. [DOI: 10.1039/c3ra42976h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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Titmarsh DM, Chen H, Wolvetang EJ, Cooper-White JJ. Arrayed cellular environments for stem cells and regenerative medicine. Biotechnol J 2012; 8:167-79. [PMID: 22890848 DOI: 10.1002/biot.201200149] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Revised: 07/02/2012] [Accepted: 07/17/2012] [Indexed: 12/26/2022]
Abstract
The behavior and composition of both multipotent and pluripotent stem cell populations are exquisitely controlled by a complex, spatiotemporally variable interplay of physico-chemical, extracellular matrix, cell-cell interaction, and soluble factor cues that collectively define the stem cell niche. The push for stem cell-based regenerative medicine models and therapies has fuelled demands for increasingly accurate cellular environmental control and enhanced experimental throughput, driving an evolution of cell culture platforms away from conventional culture formats toward integrated systems. Arrayed cellular environments typically provide a set of discrete experimental elements with variation of one or several classes of stimuli across elements of the array. These are based on high-content/high-throughput detection, small sample volumes, and multiplexing of environments to increase experimental parameter space, and can be used to address a range of biological processes at the cell population, single-cell, or subcellular level. Arrayed cellular environments have the capability to provide an unprecedented understanding of the molecular and cellular events that underlie expansion and specification of stem cell and therapeutic cell populations, and thus generate successful regenerative medicine outcomes. This review focuses on recent key developments of arrayed cellular environments and their contribution and potential in stem cells and regenerative medicine.
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Affiliation(s)
- Drew M Titmarsh
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St. Lucia, Australia
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42
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Chen QL, Cheung KL, Kong SK, Zhou JQ, Kwan YW, Wong CK, Ho HP. An integrated lab-on-a-disc for automated cell-based allergen screening bioassays. Talanta 2012; 97:48-54. [PMID: 22841046 DOI: 10.1016/j.talanta.2012.03.061] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2011] [Revised: 03/23/2012] [Accepted: 03/26/2012] [Indexed: 10/28/2022]
Abstract
We have utilized various valving scheme to leverage purely rotation-regulated flow control to enable comprehensive cell-based bioassays (CBBs) on centrifuge-based lab-on-a-disc (LOAD). A LOAD has been developed to examine allergic degranulation from live basophils for allergens screening for the first time, which can also be adjusted to suit a wide range of CBBs. In this system, controlled allergic reaction together with mediator separation from basophils using siphon valving and centrifugal sedimentation are realized inside microstructured network. The entire degranulation analysis process including on-demand release of samples, reaction and degranulation, allergic mediator separation and detection is executed in an automatic sequence within a single run. To validate our cell-based approach, detection of degranulation mediated by known secretagagues, ionomycin or chemotatic peptide formyl-methionine-leucine-pheylalanine (fMLP), is first demonstrated. Further experiments using real allergens house dust mite protein (Der p1) and its corresponding human serum IgE also show positive results. The overall efficiency of the assay is 80.6%, which is comparable to other conventional methods. With 4 identical units on a disc running in a parallel format, the device offers the possibility of single-step, multiplexed allergens screening. The device is capable of reporting a result within 30 min. It has many desirable merits including fast and multiplexed analysis, low cost, single-step operation, minimal sample volume, less discomfort and most importantly increased safety as patients are no longer susceptible to possible anaphylactic shock reactions induced by the common skin-prick-test. The flexibility of the flow control within the device makes it suitable to a wide range of CBBs.
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Affiliation(s)
- Q L Chen
- Department of Electronic Engineering, Center for Advanced Research in Photonics, The Chinese University of Hong Kong, Satin N.T., Hong Kong
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43
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Three-dimensional cell bioreactor coupled with high performance liquid chromatography–mass spectrometry for the affinity screening of bioactive components from herb medicine. J Chromatogr A 2012; 1243:33-8. [DOI: 10.1016/j.chroma.2012.04.041] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 04/12/2012] [Accepted: 04/12/2012] [Indexed: 01/09/2023]
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44
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Gao D, Liu H, Jiang Y, Lin JM, Gao D, Liu H, Jiang Y. Recent developments in microfluidic devices for in vitro cell culture for cell-biology research. Trends Analyt Chem 2012. [DOI: 10.1016/j.trac.2012.02.008] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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45
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Walling L, Schulz C, Johnson M. Dispersion serial dilution methods using the gradient diluter device. Assay Drug Dev Technol 2012; 10:507-13. [PMID: 22364546 DOI: 10.1089/adt.2011.433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
A solute aspirated into a prefilled tube of diluent undergoes a dilution effect known as dispersion. Traditionally the effects of dispersion have been considered a negative consequence of using liquid-filled fixed-tip liquid handlers. We present a novel device and technique that utilizes the effects of dispersion to the benefit of making dilutions. The device known as the Gradient Diluter extends the dilution range of practical serial dilutions to six orders of magnitude in final volumes as low as 10 μL. Presented are the device, dispersion methods, and validation tests using fluorescence detection of sulforhodamine and the high-performance liquid chromatography/ultraviolet detection of furosemide. In addition, a T-cell inhibition assay of a relevant downstream protein is used to demonstrate IC(50) curves made with the Gradient Diluter compare favorably with those generated by hand.
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46
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Chen CY, Wo AM, Jong DS. A microfluidic concentration generator for dose-response assays on ion channel pharmacology. LAB ON A CHIP 2012; 12:794-801. [PMID: 22222413 DOI: 10.1039/c1lc20548j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We present a microfluidic device to generate either statically spatial or dynamically temporal logarithmic concentrations. The temporal logarithmic concentration generator was also integrated with planar patch-clamp chips for dose-response assays on ion channels. Proposed serial dilution principle controls the flow pattern at each branching point via designing the flow resistance of microchannels. Simple and linear ratios of the flow resistance results in desired logarithmic concentration at outlets, where the concentrations can be dynamically altered by different combination of valve actuations, were demonstrated. Single-cell pharmacology on ion channels was implemented by sequentially applying logarithmic drug concentrations to patched cells. Inhibitory activity of potassium channels of human embryonic kidney cells was examined by tetraethylammonium solutions. Resulted IC(50) and Hill slope reveal excellent agreement with assays from manually prepared drug concentrations showing the practicability and preciseness of the present approach. Applications include cellular analysis under various drugs and/or logarithmic concentrations at the single-cell level.
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Affiliation(s)
- Chang-Yu Chen
- Institute of Applied Mechanics, National Taiwan University, Taipei 106, Taiwan
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47
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Oh KW, Lee K, Ahn B, Furlani EP. Design of pressure-driven microfluidic networks using electric circuit analogy. LAB ON A CHIP 2012; 12:515-45. [PMID: 22179505 DOI: 10.1039/c2lc20799k] [Citation(s) in RCA: 248] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
This article reviews the application of electric circuit methods for the analysis of pressure-driven microfluidic networks with an emphasis on concentration- and flow-dependent systems. The application of circuit methods to microfluidics is based on the analogous behaviour of hydraulic and electric circuits with correlations of pressure to voltage, volumetric flow rate to current, and hydraulic to electric resistance. Circuit analysis enables rapid predictions of pressure-driven laminar flow in microchannels and is very useful for designing complex microfluidic networks in advance of fabrication. This article provides a comprehensive overview of the physics of pressure-driven laminar flow, the formal analogy between electric and hydraulic circuits, applications of circuit theory to microfluidic network-based devices, recent development and applications of concentration- and flow-dependent microfluidic networks, and promising future applications. The lab-on-a-chip (LOC) and microfluidics community will gain insightful ideas and practical design strategies for developing unique microfluidic network-based devices to address a broad range of biological, chemical, pharmaceutical, and other scientific and technical challenges.
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Affiliation(s)
- Kwang W Oh
- SMALL (Sensors and MicroActuators Learning Lab), Department of Electrical Engineering, University at Buffalo, The State University of New York at Buffalo (SUNY-Buffalo), New York 14260, USA.
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48
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Kovarik ML, Gach PC, Ornoff DM, Wang Y, Balowski J, Farrag L, Allbritton NL. Micro total analysis systems for cell biology and biochemical assays. Anal Chem 2012; 84:516-40. [PMID: 21967743 PMCID: PMC3264799 DOI: 10.1021/ac202611x] [Citation(s) in RCA: 180] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Michelle L. Kovarik
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Phillip C. Gach
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Douglas M. Ornoff
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
- Department of Pharmacology, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Yuli Wang
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Joseph Balowski
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Lila Farrag
- School of Medicine, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Nancy L. Allbritton
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
- Department of Biomedical Engineering, University of North Carolina, Chapel Hill, NC 27599 and North Carolina State University, Raleigh, NC 27695
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49
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Sugiura S, Kanamori T. Comparison of substance supply in static and perfusion cultures based on mass transport phenomena. Biochem Eng J 2011. [DOI: 10.1016/j.bej.2011.08.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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50
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Jang YH, Hancock MJ, Kim SB, Selimović Š, Sim WY, Bae H, Khademhosseini A. An integrated microfluidic device for two-dimensional combinatorial dilution. LAB ON A CHIP 2011; 11:3277-86. [PMID: 21837312 PMCID: PMC3357545 DOI: 10.1039/c1lc20449a] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
High-throughput preparation of multi-component solutions is an integral process in biology, chemistry and materials science for screening, diagnostics and analysis. Compact microfluidic systems enable such processing with low reagent volumes and rapid testing. Here we present a microfluidic device that incorporates two gradient generators, a tree-like generator and a new microfluidic active injection system, interfaced by intermediate solution reservoirs to generate diluted combinations of input solutions within an 8 × 8 or 10 × 10 array of isolated test chambers. Three input solutions were fed into the device, two to the tree-like gradient generator and one to pre-fill the test chamber array. The relative concentrations of these three input solutions in the test chambers completely characterized device behaviour and were controlled by the number of injection cycles and the flow rate. Device behaviour was modelled by computational fluid dynamics simulations and an approximate analytic formula. The device may be used for two-dimensional (2D) combinatorial dilution by adding two solutions in different relative concentrations to each of its three inputs. By appropriate choice of the two-component input solutions, test chamber concentrations that span any triangle in 2D concentration space may be obtained. In particular, explicit inputs are given for a coarse screening of a large region in concentration space followed by a more refined screening of a smaller region, including alternate inputs that span the same concentration region but with different distributions. The ability to probe arbitrary subspaces of concentration space and to control the distribution of discrete test points within those subspaces makes the device of potential benefit for high-throughput cell biology studies and drug screening.
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Affiliation(s)
- Yun-Ho Jang
- Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, 02115, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Matthew J. Hancock
- Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, 02115, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Sang Bok Kim
- Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, 02115, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Šeila Selimović
- Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, 02115, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Woo Young Sim
- Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, 02115, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Hojae Bae
- Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, 02115, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Ali Khademhosseini
- Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, 02115, USA
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA, 02115, USA
- ; Fax: +1 617 768 8477; Tel: +1 617 768 8395
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