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Ghosh PM. WOMEN IN CANCER PROFILE: From physics to cancer biology and everywhere in between. Endocr Relat Cancer 2016; 23:P15-P21. [PMID: 27605444 DOI: 10.1530/erc-16-0382] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Accepted: 09/07/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Paramita M Ghosh
- Research ServiceVA Northern California Health Care System, Sacramento, California, USA
- Department of UrologyUniversity of California at Davis, Sacramento, California, USA
- Department of Biochemistry and Molecular MedicineUniversity of California at Davis, Sacramento, California, USA
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Chang JY, Wang S, Allen JS, Lee SH, Chang ST, Choi YK, Friedrich C, Choi CK. A novel miniature dynamic microfluidic cell culture platform using electro-osmosis diode pumping. BIOMICROFLUIDICS 2014; 8:044116. [PMID: 25379101 PMCID: PMC4189290 DOI: 10.1063/1.4892894] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Accepted: 07/31/2014] [Indexed: 05/10/2023]
Abstract
An electro-osmosis (EOS) diode pumping platform capable of culturing cells in fluidic cellular micro-environments particularly at low volume flow rates has been developed. Diode pumps have been shown to be a viable alternative to mechanically driven pumps. Typically electrokinetic micro-pumps were limited to low-concentration solutions (≤10 mM). In our approach, surface mount diodes were embedded along the sidewalls of a microchannel to rectify externally applied alternating current into pulsed direct current power across the diodes in order to generate EOS flows. This approach has for the first time generated flows at ultra-low flow rates (from 2.0 nl/s to 12.3 nl/s) in aqueous solutions with concentrations greater than 100 mM. The range of flow was generated by changing the electric field strength applied to the diodes from 0.5 Vpp/cm to 10 Vpp/cm. Embedding an additional diode on the upper surface of the enclosed microchannel increased flow rates further. We characterized the diode pump-driven fluidics in terms of intensities and frequencies of electric inputs, pH values of solutions, and solution types. As part of this study, we found that the growth of A549 human lung cancer cells was positively affected in the microfluidic diode pumping system. Though the chemical reaction compromised the fluidic control overtime, the system could be maintained fully functional over a long time if the solution was changed every hour. In conclusion, the advantage of miniature size and ability to accurately control fluids at ultra-low volume flow rates can make this diode pumping system attractive to lab-on-a-chip applications and biomedical engineering in vitro studies.
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Affiliation(s)
- Jen-Yung Chang
- Department of Mechanical Engineering-Engineering Mechanics, Michigan Technological University , Houghton Michigan 49931, USA
| | - Shuo Wang
- Department of Mechanical Engineering-Engineering Mechanics, Michigan Technological University , Houghton Michigan 49931, USA
| | - Jeffrey S Allen
- Department of Mechanical Engineering-Engineering Mechanics, Michigan Technological University , Houghton Michigan 49931, USA
| | - Seong Hyuk Lee
- School of Mechanical Engineering, Chung-Ang University , 221 Heukseok-Dong, Dongjak-Gu, Seoul 156-756, South Korea
| | - Suk Tai Chang
- School of Chemical Engineering and Materials Science, Chung-Ang University , 221 Heukseok-Dong, Dongjak-Gu, Seoul 156-756, South Korea
| | - Young-Ki Choi
- School of Mechanical Engineering, Chung-Ang University , 221 Heukseok-Dong, Dongjak-Gu, Seoul 156-756, South Korea
| | - Craig Friedrich
- Department of Mechanical Engineering-Engineering Mechanics, Michigan Technological University , Houghton Michigan 49931, USA
| | - Chang Kyoung Choi
- Department of Mechanical Engineering-Engineering Mechanics, Michigan Technological University , Houghton Michigan 49931, USA
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3
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Male KB, Tzeng YM, Montes J, Liu BL, Liao WC, Kamen A, Luong JHT. Probing inhibitory effects of destruxins from Metarhizium anisopliae using insect cell based impedance spectroscopy: inhibition vs chemical structure. Analyst 2009; 134:1447-52. [DOI: 10.1039/b822133b] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Male KB, Rao YK, Tzeng YM, Montes J, Kamen A, Luong JHT. Probing Inhibitory Effects of Antrodia camphorata Isolates Using Insect Cell-Based Impedance Spectroscopy: Inhibition vs Chemical Structure. Chem Res Toxicol 2008; 21:2127-33. [DOI: 10.1021/tx800202a] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Keith B. Male
- Biotechnology Research Institute, National Research Council Canada, Montreal, Quebec, Canada H4P 2R2, Institute of Biotechnology, Chaoyang University of Technology, Wufeng, 41349 Taiwan, Republic of China, and Department of Chemistry, University College Cork, Cork, Ireland
| | - Yerra Koteswara Rao
- Biotechnology Research Institute, National Research Council Canada, Montreal, Quebec, Canada H4P 2R2, Institute of Biotechnology, Chaoyang University of Technology, Wufeng, 41349 Taiwan, Republic of China, and Department of Chemistry, University College Cork, Cork, Ireland
| | - Yew-Min Tzeng
- Biotechnology Research Institute, National Research Council Canada, Montreal, Quebec, Canada H4P 2R2, Institute of Biotechnology, Chaoyang University of Technology, Wufeng, 41349 Taiwan, Republic of China, and Department of Chemistry, University College Cork, Cork, Ireland
| | - Johnny Montes
- Biotechnology Research Institute, National Research Council Canada, Montreal, Quebec, Canada H4P 2R2, Institute of Biotechnology, Chaoyang University of Technology, Wufeng, 41349 Taiwan, Republic of China, and Department of Chemistry, University College Cork, Cork, Ireland
| | - Amine Kamen
- Biotechnology Research Institute, National Research Council Canada, Montreal, Quebec, Canada H4P 2R2, Institute of Biotechnology, Chaoyang University of Technology, Wufeng, 41349 Taiwan, Republic of China, and Department of Chemistry, University College Cork, Cork, Ireland
| | - John H. T. Luong
- Biotechnology Research Institute, National Research Council Canada, Montreal, Quebec, Canada H4P 2R2, Institute of Biotechnology, Chaoyang University of Technology, Wufeng, 41349 Taiwan, Republic of China, and Department of Chemistry, University College Cork, Cork, Ireland
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Ateh DD, Waterworth A, Walker D, Brown BH, Navsaria H, Vadgama P. Impedimetric sensing of cells on polypyrrole-based conducting polymers. J Biomed Mater Res A 2007; 83:391-400. [PMID: 17450583 DOI: 10.1002/jbm.a.31308] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Polypyrrole (PPy) is a conducting polymer that may be electrochemically generated with the incorporation of any anionic species, including net-negatively charged biological molecules such as proteins and polysaccharides. In this article, dermatan and chloride-loaded PPy films were prepared on gold sputter-coated coverslips and various skin derived cells were studied on them by electrochemical impedance spectroscopy. Impedance spectra in the frequency range 1-100 kHz were either determined at specific times or impedance was monitored continuously at specific frequencies. An equivalent impedance circuit was fitted to the recorded impedance spectra to obtain parameters whose contributions could be mapped to intracellular and intercellular current pathways, and the membrane properties of cells. Results show cell-induced impedance changes were detected over PPy modified electrodes and were dependent on cell density and type, monitoring frequency, material composition, and treatment. Lower cell densities were detected on PPy when compared with bare gold. Keratinocyte confluence, as determined by impedimetric analysis, was reached more rapidly on PPy than on gold. This was consistent with previous, more cumbersome, biochemical assays. Electrical equivalent circuit analysis provided evidence that the technique may be extended to discriminate cell type because of the intracellular and intercellular resistance, and cell membrane capacitance being related to cell morphology.
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Affiliation(s)
- D D Ateh
- IRC in Biomedical Materials, Queen Mary University of London, London, United Kingdom.
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Lo CM, Linton M, Keese CR, Giaever I. Correlated motion and oscillation of neighboring cells in vitro. CELL COMMUNICATION & ADHESION 2004; 8:139-45. [PMID: 11936188 DOI: 10.3109/15419060109080713] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
It has long been realized that fibroblastic and epithelial cells establish recognizable patterns in tissue culture. This behavior implies that neighboring cells interact with one another to produce organized populations. Interaction between cells that are separated by many intervening cells is also possible and is demonstrated here using a special configuration of a biosensor referred to as electric cell-substrate impedance sensing (ECIS). Normally the electrical impedance of a single electrode covered with a confluent cell layer is measured, and the morphological changes of the cells are reflected in the impedance. In this case the cells are cultured on two closely spaced electrodes whose impedances are measured independently as a function of time, and communication between the cell populations is revealed as a correlation between these two time series. We also report for the first time another striking manifestation of dynamic cell interaction, where confluent layers of Madin-Darby canine kidney cells (MDCK) on a single electrode are observed to oscillate in synchrony with a period of approximately 2.5 h.
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Affiliation(s)
- C M Lo
- University of Massachusetts Medical School, Worcester, USA
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De Blasio BF, Røttingen JA, Sand KL, Giaever I, Iversen JG. Global, synchronous oscillations in cytosolic calcium and adherence in bradykinin-stimulated Madin-Darby canine kidney cells. ACTA ACUST UNITED AC 2004; 180:335-46. [PMID: 15030375 DOI: 10.1111/j.1365-201x.2004.01261.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIMS AND METHODS Intercellular Ca2+ oscillations are a universal mode of signalling in both excitable and non-excitable cells. Here, we study the relationship between Ca2+ signalling and coherent changes in adhesion properties by measuring the transepithelial impedance across bradykinin-stimulated Madin-Darby canine kidney (MDCK) cell layers grown on a microelectrode. During hormone stimulation, the impedance is found to oscillate, reflecting that the cells undergo morphological/adhesive alterations with high spatio-temporal organization. The experiments are supplemented with parallel, digital imaging fluorescence microscopy of bradykinin-induced single-cell Ca2+ oscillations. RESULTS In agreement with previous experiments, MDCK cells are found to elicit synchronous, multicellular Ca2+ oscillations in response to hormone stimulus. The periods of the Ca2+ oscillations and the electrical fluctuations are found to coincide. Further, blocking of gap junctions by 18alpha-glycyrrhetinic acid causes a loss of synchrony in Ca2+ signals and inhibition of impedance oscillations, emphasizing the importance of gap junctions in the signal transduction process. CONCLUSION Based on these observations it is concluded that the co-ordinated adhesive changes in MDCK cells are a direct consequence of synchronized Ca2+ oscillations. Calcium signalling represents an efficient way of organizing physiological responses in a tissue. A possible functional implication of the structural changes might be to modulate transportation of various substances across the cell sheet.
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Affiliation(s)
- B F De Blasio
- The Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
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Luong JHT. An Emerging Impedance Sensor Based on Cell-Protein Interactions: Applications in Cell Biology and Analytical Biochemistry. ANAL LETT 2003. [DOI: 10.1081/al-120026565] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Xiao C, Lachance B, Sunahara G, Luong JHT. An in-depth analysis of electric cell-substrate impedance sensing to study the attachment and spreading of mammalian cells. Anal Chem 2002; 74:1333-9. [PMID: 11924593 DOI: 10.1021/ac011104a] [Citation(s) in RCA: 110] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The attachment and spreading of fibroblast cells on a gold surface coated with fibronectin or ovalbumin were studied by a modified electric cell-substrate impedance sensor. In this system, cells were cultured in a well, equipped with a detecting gold electrode (surface area of 0.057 mm2) and a gold counter electrode (18 mm2). Based on a comprehensive theoretical framework, the impedance of the electrode-electrolyte interface and a cell layer was precisely obtained for frequencies ranging from 1 to 10 kHz. Surface concentrations of the protein adsorbed on the gold surface were determined by a surface plasmon resonance biosensor. The resistance change of the electrode-electrolyte interface at 4 kHz increased linearly with the number of fibroblast cells attached on the detecting electrode. The slope of the linear relationship appeared to depend on the type of coating protein. As the surface area occupied by the cells was also proportional to the cell number, the resistance change was in turn proportional to the area covered by the cells.
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Affiliation(s)
- Caide Xiao
- Biotechnology Research Institute, National Research Council Canada, Montreal, Quebec
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Luong JH, Habibi-Rezaei M, Meghrous J, Xiao C, Male KB, Kamen A. Monitoring motility, spreading, and mortality of adherent insect cells using an impedance sensor. Anal Chem 2001; 73:1844-8. [PMID: 11338600 DOI: 10.1021/ac0011585] [Citation(s) in RCA: 90] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An emerging sensor technology referred to as electric cell-substrate impedance sensing (ECIS) has been extended for monitoring the behavior of insect cells including attachment, motility, and mortality. In ECIS, adherent cells were cultured on an array of eight small gold electrodes deposited on the bottom of tissue culture wells and immersed in a culture medium. Upon the attachment and spreading of cells on the gold electrode, the impedance increased because the cells acted as insulating particles to restrict the current flow. Experimental data revealed that insect cells interacted differently with various proteins used to precoat the gold electrode with concanavalin A as the best promoter to accelerate the rate of cell attachment. After the cells were fully spread, the measured impedance continued to fluctuate to reflect the constant motion and metabolic activity of the cells. As the cell behavior was sensitive to external chemicals, the applicability of ECIS for inhibition assays was demonstrated with HgCl2, trinitrotoluene, trinitrobenzene (TNB), and 2-amino-4,6-dinitrotoluene as model systems. Unlike conventional assays, the quantitative data obtained in this study are taken in real time and in a continuous fashion to depict cell motility and mortality.
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Affiliation(s)
- J H Luong
- Biotechnology Research Institute, National Research Council Canada, Montreal, Quebec, Canada H4P 2R2
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Filipic B, Kovács K, Somogyvári F, Ihan A, Ocsovszky I, Koren S, Tóth S. The effects of medium-strength electric impulses on human blood. Bioelectrochemistry 2000; 52:29-36. [PMID: 11059574 DOI: 10.1016/s0302-4598(00)00079-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Leukocyte subsets, total leukocyte isolates or full blood samples were subjected to medium-strength square-wave electric impulses (100 V/cm field force, 5 ms duration). On the surface of the leukocytes, the expressions of several markers (CD3, CD4, CD8, CD11a, CD11b and ICAM-1) were determined in order to study the influence of pulsed ionic currents on different aspects of the cellular immune response. Large individual differences were observed among randomly chosen healthy donors, both in the initial expression rate and in the response patterns of different antigens. As a general conclusion, it can be stated that electric impulses with the above parameters activate the state of immune response alertness of human leukocytes. Changes in the activities of several enzymes in the serum in response to electric impulses were also tested in order to examine the feasibility of ex vivo electric treatment of human blood for the establishment of an antiviral and immune activated condition. Slightly elevated lactate dehydrogenase (LDH) levels point to a possibility of enhanced haemolysis, while the lack of an elevation in the membrane-bound peroxidase activity indicates the absence of haemolysis. Significant rises were detected in the serum superoxide dismutase (SOD) activities. Since most ex vivo blood manipulations are characterised by the appearance of superoxide radicals in the serum, a SOD activity enhancement is considered beneficial in these cases. A mild, but significant reduction in the blood clotting time indicates that electric treatment of human blood should be performed with special attention to thrombosis-prone conditions, and adequate precautions and countermeasures should be introduced. Although wider examinations are required before this method can be fully recommended, ex vivo blood treatment with medium-strength electric impulses seems to be a promising adjuvant course for the establishment of acute immune potentiation and an antiviral state in patients undergoing dialysis treatment.
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Affiliation(s)
- B Filipic
- Institute of Microbiology and Immunology, Medical Faculty, Ljubljana, Slovenia.
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