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Sano M, Kaji N, Rowat AC, Yasaki H, Shao L, Odaka H, Yasui T, Higashiyama T, Baba Y. Microfluidic Mechanotyping of a Single Cell with Two Consecutive Constrictions of Different Sizes and an Electrical Detection System. Anal Chem 2019; 91:12890-12899. [PMID: 31442026 DOI: 10.1021/acs.analchem.9b02818] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The mechanical properties of a cell, which include parameters such as elasticity, inner pressure, and tensile strength, are extremely important because changes in these properties are indicative of diseases ranging from diabetes to malignant transformation. Considering the heterogeneity within a population of cancer cells, a robust measurement system at the single cell level is required for research and in clinical purposes. In this study, a potential microfluidic device for high-throughput and practical mechanotyping were developed to investigate the deformability and sizes of cells through a single run. This mechanotyping device consisted of two different sizes of consecutive constrictions in a microchannel and measured the size of cells and related deformability during transit. Cell deformability was evaluated based on the transit and on the effects of cytoskeleton-affecting drugs, which were detected within 50 ms. The mechanotyping device was able to also measure a cell cycle without the use of fluorescent or protein tags.
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Affiliation(s)
- Mamiko Sano
- Department of Biomolecular Engineering, Graduate School of Engineering , Nagoya University , Furo-cho , Chikusa-ku, Nagoya 464-8603 , Japan.,Institute of Nano-Life-Systems, Institutes of Innovation for Future Society , Nagoya University , Furo-cho , Chikusa-ku, Nagoya 464-8603 , Japan
| | - Noritada Kaji
- Institute of Nano-Life-Systems, Institutes of Innovation for Future Society , Nagoya University , Furo-cho , Chikusa-ku, Nagoya 464-8603 , Japan.,Department of Applied Chemistry, Graduate School of Engineering , Kyushu University , Moto-oka 744 , Nishi-ku, Fukuoka 819-0395 , Japan.,Japan Science and Technology Agency, PRESTO , 4-1-8 Honcho , Kawaguchi , Saitama 332-0012 , Japan
| | - Amy C Rowat
- Department of Integrative Biology & Physiology , University of California Los Angeles , 610 Charles E Young Dr. East , Los Angeles , California 90095 , United States
| | - Hirotoshi Yasaki
- Department of Biomolecular Engineering, Graduate School of Engineering , Nagoya University , Furo-cho , Chikusa-ku, Nagoya 464-8603 , Japan.,Institute of Nano-Life-Systems, Institutes of Innovation for Future Society , Nagoya University , Furo-cho , Chikusa-ku, Nagoya 464-8603 , Japan
| | - Long Shao
- AGC Inc. , Suehiro 1-1 , Tsurumi-ku, Yokohama City , Kanagawa 230-0045 , Japan
| | - Hidefumi Odaka
- AGC Inc. , Suehiro 1-1 , Tsurumi-ku, Yokohama City , Kanagawa 230-0045 , Japan
| | - Takao Yasui
- Department of Biomolecular Engineering, Graduate School of Engineering , Nagoya University , Furo-cho , Chikusa-ku, Nagoya 464-8603 , Japan.,Institute of Nano-Life-Systems, Institutes of Innovation for Future Society , Nagoya University , Furo-cho , Chikusa-ku, Nagoya 464-8603 , Japan.,Japan Science and Technology Agency, PRESTO , 4-1-8 Honcho , Kawaguchi , Saitama 332-0012 , Japan
| | - Tetsuya Higashiyama
- Institute of Transformative Bio-Molecules (ITbM) , Nagoya University , Furo-cho , Chikusa-ku, Nagoya 464-8602 , Japan.,Division of Biological Science, Graduate School of Science , Nagoya University , Furo-cho , Chikusa-ku, Nagoya 464-8602 , Japan
| | - Yoshinobu Baba
- Department of Biomolecular Engineering, Graduate School of Engineering , Nagoya University , Furo-cho , Chikusa-ku, Nagoya 464-8603 , Japan.,Institute of Nano-Life-Systems, Institutes of Innovation for Future Society , Nagoya University , Furo-cho , Chikusa-ku, Nagoya 464-8603 , Japan.,Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) , Hayashi-cho 2217-14 , Takamatsu 761-0395 , Japan.,College of Pharmacy , Kaohsiung Medical University , 100, Shih-Chuan First Road , Kaohsiung , 807 , Taiwan, R.O.C
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Effect of Electrode Shape on Impedance of Single HeLa Cell: A COMSOL Simulation. BIOMED RESEARCH INTERNATIONAL 2015; 2015:871603. [PMID: 25961043 PMCID: PMC4415739 DOI: 10.1155/2015/871603] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Accepted: 11/07/2014] [Indexed: 11/28/2022]
Abstract
In disease prophylaxis, single cell inspection provides more detailed data compared to conventional examinations. At the individual cell level, the electrical properties of the cell are helpful for understanding the effects of cellular behavior. The electric field distribution affects the results of single cell impedance measurements whereas the electrode geometry affects the electric field distributions. Therefore, this study obtained numerical solutions by using the COMSOL multiphysics package to perform FEM simulations of the effects of electrode geometry on microfluidic devices. An equivalent circuit model incorporating the PBS solution, a pair of electrodes, and a cell is used to obtain the impedance of a single HeLa cell. Simulations indicated that the circle and parallel electrodes provide higher electric field strength compared to cross and standard electrodes at the same operating voltage. Additionally, increasing the operating voltage reduces the impedance magnitude of a single HeLa cell in all electrode shapes. Decreasing impedance magnitude of the single HeLa cell increases measurement sensitivity, but higher operational voltage will damage single HeLa cell.
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Galicia-Vázquez G, Cencic R, Robert F, Agenor AQ, Pelletier J. A cellular response linking eIF4AI activity to eIF4AII transcription. RNA (NEW YORK, N.Y.) 2012; 18:1373-84. [PMID: 22589333 PMCID: PMC3383968 DOI: 10.1261/rna.033209.112] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2012] [Accepted: 04/05/2012] [Indexed: 05/18/2023]
Abstract
The recruitment of ribosomes to eukaryotic cellular mRNAs requires the activity of two prototypic RNA helicases, eukaryotic initiation factor (eIF) 4AI and eIF4AII. The eIF4A isoforms are highly conserved, are thought to be functionally interchangeable, and are directed to the 5' m(7)GpppN cap structure of mRNAs during translation initiation by virtue of their assembly into eIF4F, a heterotrimeric complex that also harbors the eIF4E cap binding protein and eIF4G scaffolding unit. During the course of RNA interference experiments aimed at investigating the respective roles of eIF4AI and eIF4AII in translation, we uncovered a cellular response pathway whereby suppression of eIF4AI increases transcription of the eIF4AII gene, leading to elevated eIF4AII mRNA and protein levels. Inhibition of eIF4AI suppresses protein synthesis, and although eIF4AII protein levels increase above and beyond what should be sufficient to compensate for the decrease in eIF4AI levels, there is no corresponding rescue of translation or of the block on cellular proliferation that occurs upon eIF4AI suppression. These results were phenocopied using the small molecule eIF4A inhibitor hippuristanol. Taken together, our results indicate that eIF4AI and eIF4AII expression appear linked and that the two protein isoforms exhibit functional differences.
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Affiliation(s)
| | | | | | | | - Jerry Pelletier
- Department of Biochemistry and
- The Rosalind and Morris Goodman Cancer Research Center, McGill University, Montreal, Quebec, Canada, H3G 1Y6
- Corresponding authorE-mail
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Alexandrov Y, Santos AF, Hather C, Zaltsman AB. Microscopy-based HTS examines the mechanism of stress F-actin fiber disruption by cytochalasin D: orientation texture data collated with quantitative kinetic modeling. Assay Drug Dev Technol 2009; 7:366-73. [PMID: 19689205 DOI: 10.1089/adt.2008.0170] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
We report a drug dose-response, end-point study of intracellular filamentous actin (F-actin) by automated fluorescence microscopy, complemented with theoretical kinetic simulation of drug action. We highlight the use of an advanced orientation-sensitive image processing procedure (<cos(2)theta> transform), specially tailored for the detection of ordered filamentous "patches" in cell images. To examine the extent of stress F-actin disruption caused by the drug, we compare the measured response based on the above transformation with the theoretical data obtained from a quantitative model. We show that the assay data are consistent with the first-order mass action kinetics predicted by a basic reaction model. As a concluding remark, we briefly discuss advantages, perspectives, and challenges of conventional fluorescent microscopy within the context of the quantitative high-throughput screening paradigm.
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Deman JJ, Vakaet LC, Bruyneel EA. Cell size and mutual cell adhesion. II. Evidence for a relation between cell size, long-range electrostatic repulsion and intercellular adhesiveness during density-regulated growth in suspension. J Membr Biol 1976; 26:205-15. [PMID: 1263252 DOI: 10.1007/bf01868874] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The strength of the long-range electrostatic repulsion forces on HeLa cells is measured by agglutinative titration using low molecular weight polylysine (M.W. 11,000). Repulsion forces, found to be present on the smaller HeLa cells from density-inhibited suspension cultures, are weakened by incubation of the cells in hypotonic NaCl solutions. Repulsion forces, found to be absent on the larger cells from fast growing cultures, can be induced on these cells by incubation in hypertonic NaCl solutions. Both effects of anisotonicity are reversible, and disappear on restoration of the medium to normal tonicity. Induction of repulsion forces on fast growing cells is prevented by previous treatment of the cells with neuraminidase. Neuraminidase also abolishes repulsion on density-inhibited cells. It is proposed that alterations of the cell size, produced by anisotonicity or occurring during growth in isotonic suspension medium, affect mutual cell adhesiveness by modifying the strength of the repulsion forces generated by cell surface sialic acids.
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