1
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Zhang S, Han Z, Qi H, Liu S, Liu B, Sun C, Feng Z, Sun M, Duan X. Convolutional Neural Network-Driven Impedance Flow Cytometry for Accurate Bacterial Differentiation. Anal Chem 2024; 96:4419-4429. [PMID: 38448396 DOI: 10.1021/acs.analchem.3c04421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2024]
Abstract
Impedance flow cytometry (IFC) has been demonstrated to be an efficient tool for label-free bacterial investigation to obtain the electrical properties in real time. However, the accurate differentiation of different species of bacteria by IFC technology remains a challenge owing to the insignificant differences in data. Here, we developed a convolutional neural networks (ConvNet) deep learning approach to enhance the accuracy and efficiency of the IFC toward distinguishing various species of bacteria. First, more than 1 million sets of impedance data (comprising 42 characteristic features for each set) of various groups of bacteria were trained by the ConvNet model. To improve the efficiency for data analysis, the Spearman correlation coefficient and the mean decrease accuracy of the random forest algorithm were introduced to eliminate feature interaction and extract the opacity of impedance related to the bacterial wall and membrane structure as the predominant features in bacterial differentiation. Moreover, the 25 optimized features were selected with differentiation accuracies of >96% for three groups of bacteria (bacilli, cocci, and vibrio) and >95% for two species of bacilli (Escherichia coli and Salmonella enteritidis), compared to machine learning algorithms (complex tree, linear discriminant, and K-nearest neighbor algorithms) with a maximum accuracy of 76.4%. Furthermore, bacterial differentiation was achieved on spiked samples of different species with different mixing ratios. The proposed ConvNet deep learning-assisted data analysis method of IFC exhibits advantages in analyzing a huge number of data sets with capacity for extracting predominant features within multicomponent information and will bring about progress and advances in the fields of both biosensing and data analysis.
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Affiliation(s)
- Shuaihua Zhang
- State Key Laboratory of Precision Measuring Technology & Instruments, College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
| | - Ziyu Han
- State Key Laboratory of Precision Measuring Technology & Instruments, College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
| | - Hang Qi
- State Key Laboratory of Precision Measuring Technology & Instruments, College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
| | - Siyuan Liu
- State Key Laboratory of Precision Measuring Technology & Instruments, College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
| | - Bohua Liu
- State Key Laboratory of Precision Measuring Technology & Instruments, College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
| | - Chongling Sun
- State Key Laboratory of Precision Measuring Technology & Instruments, College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
| | - Zhe Feng
- Wuqing District Center for Disease Control and Prevention, Tianjin 301700, China
| | - Meiqing Sun
- Wuqing District Center for Disease Control and Prevention, Tianjin 301700, China
| | - Xuexin Duan
- State Key Laboratory of Precision Measuring Technology & Instruments, College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
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2
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Sun S, Ma Q, Sheng Q, Huang S, Wu C, Liu J, Xu J. Amyloid-β Oligomer-Induced Electrophysiological Mechanisms and Electrical Impedance Changes in Neurons. SENSORS (BASEL, SWITZERLAND) 2024; 24:1211. [PMID: 38400369 PMCID: PMC10892449 DOI: 10.3390/s24041211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Revised: 02/04/2024] [Accepted: 02/10/2024] [Indexed: 02/25/2024]
Abstract
Amyloid plays a critical role in the pathogenesis of Alzheimer's disease (AD) and can aggregate to form oligomers and fibrils in the brain. There is increasing evidence that highly toxic amyloid-β oligomers (AβOs) lead to tau protein aggregation, hyperphosphorylation, neuroinflammation, neuronal loss, synaptic loss, and dysfunction. Although the effects of AβOs on neurons have been investigated using conventional biochemical experiments, there are no established criteria for electrical evaluation. To this end, we explored electrophysiological changes in mouse hippocampal neurons (HT22) following exposure to AβOs and/or naringenin (Nar, a flavonoid compound) using electrical impedance spectroscopy (EIS). AβO-induced HT22 showed a decreased impedance amplitude and increased phase angle, and the addition of Nar reversed these changes. The characteristic frequency was markedly increased with AβO exposure, which was also reversed by Nar. The AβOs decreased intranuclear and cytoplasmic resistance and increased nucleus resistance and extracellular capacitance. Overall, the innovative construction of the eight-element CPE-equivalent circuit model further reflects that the pseudo-capacitance of the cell membrane and cell nucleus was increased in the AβO-induced group. This study conclusively revealed that AβOs induce cytotoxic effects by disrupting the resistance characteristics of unit membranes. The results further support that EIS is an effective technique for evaluating AβO-induced neuronal damage and microscopic electrical distinctions in the sub-microscopic structure of reactive cells.
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Affiliation(s)
- Shimeng Sun
- Department of Physiology and Pharmacology, Health Science Center, Ningbo University, Ningbo 315211, China; (S.S.); (Q.M.); (Q.S.); (S.H.); (C.W.)
| | - Qing Ma
- Department of Physiology and Pharmacology, Health Science Center, Ningbo University, Ningbo 315211, China; (S.S.); (Q.M.); (Q.S.); (S.H.); (C.W.)
| | - Qiyu Sheng
- Department of Physiology and Pharmacology, Health Science Center, Ningbo University, Ningbo 315211, China; (S.S.); (Q.M.); (Q.S.); (S.H.); (C.W.)
| | - Shangwei Huang
- Department of Physiology and Pharmacology, Health Science Center, Ningbo University, Ningbo 315211, China; (S.S.); (Q.M.); (Q.S.); (S.H.); (C.W.)
| | - Chenxia Wu
- Department of Physiology and Pharmacology, Health Science Center, Ningbo University, Ningbo 315211, China; (S.S.); (Q.M.); (Q.S.); (S.H.); (C.W.)
| | - Junsong Liu
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
| | - Jia Xu
- Department of Physiology and Pharmacology, Health Science Center, Ningbo University, Ningbo 315211, China; (S.S.); (Q.M.); (Q.S.); (S.H.); (C.W.)
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3
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Tang T, Julian T, Ma D, Yang Y, Li M, Hosokawa Y, Yalikun Y. A review on intelligent impedance cytometry systems: Development, applications and advances. Anal Chim Acta 2023; 1269:341424. [PMID: 37290859 DOI: 10.1016/j.aca.2023.341424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 05/22/2023] [Accepted: 05/23/2023] [Indexed: 06/10/2023]
Abstract
Impedance cytometry is a well-established technique for counting and analyzing single cells, with several advantages, such as convenience, high throughput, and no labeling required. A typical experiment consists of the following steps: single-cell measurement, signal processing, data calibration, and particle subtype identification. At the beginning of this article, we compared commercial and self-developed options extensively and provided references for developing reliable detection systems, which are necessary for cell measurement. Then, a number of typical impedance metrics and their relationships to biophysical properties of cells were analyzed with respect to the impedance signal analysis. Given the rapid advances of intelligent impedance cytometry in the past decade, this article also discussed the development of representative machine learning-based approaches and systems, and their applications in data calibration and particle identification. Finally, the remaining challenges facing the field were summarized, and potential future directions for each step of impedance detection were discussed.
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Affiliation(s)
- Tao Tang
- Division of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayamacho, Ikoma, Nara, 630-0192, Japan; Department of Biomedical Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore
| | - Trisna Julian
- Division of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayamacho, Ikoma, Nara, 630-0192, Japan
| | - Doudou Ma
- Center for Biosystems Dynamics Research (BDR), RIKEN, 1-3 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Yang Yang
- Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya, Hainan, 572000, PR China
| | - Ming Li
- School of Engineering, Macquarie University, Sydney, 2109, Australia
| | - Yoichiroh Hosokawa
- Division of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayamacho, Ikoma, Nara, 630-0192, Japan
| | - Yaxiaer Yalikun
- Division of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayamacho, Ikoma, Nara, 630-0192, Japan; Center for Biosystems Dynamics Research (BDR), RIKEN, 1-3 Yamadaoka, Suita, Osaka, 565-0871, Japan.
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4
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Troiano C, De Ninno A, Casciaro B, Riccitelli F, Park Y, Businaro L, Massoud R, Mangoni ML, Bisegna P, Stella L, Caselli F. Rapid Assessment of Susceptibility of Bacteria and Erythrocytes to Antimicrobial Peptides by Single-Cell Impedance Cytometry. ACS Sens 2023. [PMID: 37421371 PMCID: PMC10391704 DOI: 10.1021/acssensors.3c00256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/10/2023]
Abstract
Antimicrobial peptides (AMPs) represent a promising class of compounds to fight antibiotic-resistant infections. In most cases, they kill bacteria by making their membrane permeable and therefore exhibit low propensity to induce bacterial resistance. In addition, they are often selective, killing bacteria at concentrations lower than those at which they are toxic to the host. However, clinical applications of AMPs are hindered by a limited understanding of their interactions with bacteria and human cells. Standard susceptibility testing methods are based on the analysis of the growth of a bacterial population and therefore require several hours. Moreover, different assays are required to assess the toxicity to host cells. In this work, we propose the use of microfluidic impedance cytometry to explore the action of AMPs on both bacteria and host cells in a rapid manner and with single-cell resolution. Impedance measurements are particularly well-suited to detect the effects of AMPs on bacteria, due to the fact that the mechanism of action involves perturbation of the permeability of cell membranes. We show that the electrical signatures of Bacillus megaterium cells and human red blood cells (RBCs) reflect the action of a representative antimicrobial peptide, DNS-PMAP23. In particular, the impedance phase at high frequency (e.g., 11 or 20 MHz) is a reliable label-free metric for monitoring DNS-PMAP23 bactericidal activity and toxicity to RBCs. The impedance-based characterization is validated by comparison with standard antibacterial activity assays and absorbance-based hemolytic activity assays. Furthermore, we demonstrate the applicability of the technique to a mixed sample of B. megaterium cells and RBCs, which paves the way to study AMP selectivity for bacterial versus eukaryotic cells in the presence of both cell types.
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Affiliation(s)
- Cassandra Troiano
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Adele De Ninno
- Institute for Photonics and Nanotechnologies, Italian National Research Council, 00133 Rome, Italy
| | - Bruno Casciaro
- Laboratory affiliated to Pasteur Italia-Fondazione Cenci Bolognetti, Department of Biochemical Sciences "A. Rossi Fanelli", Sapienza University of Rome, 00185 Rome, Italy
| | - Francesco Riccitelli
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Yoonkyung Park
- Department of Biomedical Science, College of Natural science, Chosun University, Gwangju 61452, Republic of Korea
| | - Luca Businaro
- Institute for Photonics and Nanotechnologies, Italian National Research Council, 00133 Rome, Italy
| | - Renato Massoud
- Department of Experimental Medicine, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Maria Luisa Mangoni
- Laboratory affiliated to Pasteur Italia-Fondazione Cenci Bolognetti, Department of Biochemical Sciences "A. Rossi Fanelli", Sapienza University of Rome, 00185 Rome, Italy
| | - Paolo Bisegna
- Department of Civil Engineering and Computer Science, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Lorenzo Stella
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Federica Caselli
- Department of Civil Engineering and Computer Science, University of Rome Tor Vergata, 00133 Rome, Italy
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5
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Bouzid K, Greener J, Carrara S, Gosselin B. Portable impedance-sensing device for microorganism characterization in the field. Sci Rep 2023; 13:10526. [PMID: 37386229 PMCID: PMC10310846 DOI: 10.1038/s41598-023-37506-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Accepted: 06/22/2023] [Indexed: 07/01/2023] Open
Abstract
A variety of biosensors have been proposed to quickly detect and measure the properties of individual microorganisms among heterogeneous populations, but challenges related to cost, portability, stability, sensitivity, and power consumption limit their applicability. This study proposes a portable microfluidic device based on impedance flow-cytometry and electrical impedance spectroscopy that can detect and quantify the size of microparticles larger than 45 µm, such as algae and microplastics. The system is low cost ($300), portable (5 cm [Formula: see text] 5 cm), low-power (1.2 W), and easily fabricated utilizing a 3D-printer and industrial printed circuit board technology. The main novelty we demonstrate is the use of square wave excitation signal for impedance measurements with quadrature phase-sensitive detectors. A linked algorithm removes the errors associated to higher order harmonics. After validating the performance of the device for complex impedance models, we used it to detect and differentiate between polyethylene microbeads of sizes between 63 and 83 µm, and buccal cells between 45 and 70 µm. A precision of 3% is reported for the measured impedance and a minimum size of 45 µm is reported for the particle characterization.
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Affiliation(s)
- Karim Bouzid
- Department of Electrical and Computer Engineering, Laval University, Quebec-City, G1V 0A6, Canada.
| | - Jesse Greener
- Department of Chemistry, Laval University, Quebec-City, G1V 0A6, Canada
| | - Sandro Carrara
- Institute of Electrical and Micro Engineering, École Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
| | - Benoit Gosselin
- Department of Electrical and Computer Engineering, Laval University, Quebec-City, G1V 0A6, Canada
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6
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Lin YS, Sun CL, Tsang S, Bensalem S, Le Pioufle B, Wang HY. Label-free and noninvasive analysis of microorganism surface epistructures at the single-cell level. Biophys J 2023; 122:1794-1806. [PMID: 37041747 PMCID: PMC10209039 DOI: 10.1016/j.bpj.2023.04.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 11/10/2022] [Accepted: 04/07/2023] [Indexed: 04/13/2023] Open
Abstract
Cell surface properties of microorganisms provide abundant information for their physiological status and fate choice. However, current methods for analyzing cell surface properties require labeling or fixation, which can alter the cell activity. This study establishes a label-free, rapid, noninvasive, and quantitative analysis of cell surface properties, including the presence and the dimension of epistructure, down to the single-cell level and at the nanometer scale. Simultaneously, electrorotation provides dielectric properties of intracellular contents. With the combined information, the growth phase of microalgae cells can be identified. The measurement is based on electrorotation of single cells, and an electrorotation model accounting for the surface properties is developed to properly interpret experimental data. The epistructure length measured by electrorotation is validated by scanning electron microscopy. The measurement accuracy is satisfactory in particular in the case of microscale epistructures in the exponential phase and nanoscale epistructures in the stationary phase. However, the measurement accuracy for nanoscale epistructures on cells in the exponential phase is offset by the effect of a thick double layer. Lastly, a diversity in epistructure length distinguishes exponential phase from stationary phase.
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Affiliation(s)
- Yu-Sheng Lin
- Department of Engineering and System Science, National Tsing Hua University, Hsinchu, Taiwan; Université Paris Saclay, ENS Paris Saclay, CNRS Institut d'Alembert, SATIE, Gif sur Yvette, France
| | - Chen-Li Sun
- Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan
| | - Sung Tsang
- Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan
| | - Sakina Bensalem
- Université Paris Saclay, ENS Paris Saclay, CNRS Institut d'Alembert, LUMIN, Gif sur Yvette, France
| | - Bruno Le Pioufle
- Université Paris Saclay, ENS Paris Saclay, CNRS Institut d'Alembert, LUMIN, Gif sur Yvette, France
| | - Hsiang-Yu Wang
- Department of Engineering and System Science, National Tsing Hua University, Hsinchu, Taiwan.
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7
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Zhou J, Huang J, Huang H, Zhao C, Zou M, Liu D, Weng X, Liu L, Qu J, Liu L, Liao C, Wang Y. Fiber-integrated cantilever-based nanomechanical biosensors as a tool for rapid antibiotic susceptibility testing. BIOMEDICAL OPTICS EXPRESS 2023; 14:1862-1873. [PMID: 37206142 PMCID: PMC10191643 DOI: 10.1364/boe.484015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 02/19/2023] [Accepted: 03/10/2023] [Indexed: 05/21/2023]
Abstract
There is an urgent need for developing rapid and affordable antibiotic susceptibility testing (AST) technologies to inhibit the overuse of antibiotics. In this study, a novel microcantilever nanomechanical biosensor based on Fabry-Pérot interference demodulation was developed for AST. To construct the biosensor, a cantilever was integrated with the single mode fiber in order to form the Fabry-Pérot interferometer (FPI). After the attachment of bacteria on the cantilever, the fluctuations of cantilever caused by the bacterial movements were detected by monitoring the changes of resonance wavelength in the interference spectrum. We applied this methodology to Escherichia coli and Staphylococcus aureus, showing the amplitude of cantilever's fluctuations was positively related on the quantity of bacteria immobilized on the cantilever and associated with the bacterial metabolism. The response of bacteria to antibiotics was dependent on the types of bacteria, the types and concentrations of antibiotics. Moreover, the minimum inhibitory and bactericidal concentrations for Escherichia coli were obtained within 30 minutes, demonstrating the capacity of this method for rapid AST. Benefiting from the simplicity and portability of the optical fiber FPI-based nanomotion detection device, the developed nanomechanical biosensor in this study provides a promising technique for AST and a more rapid alternative for clinical laboratories.
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Affiliation(s)
- Jie Zhou
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
- Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things, Guangdong and Hong Kong Joint Research Centre for Optical Fiber Sensors, Shenzhen University, Shenzhen 518060, China
| | - Jiabin Huang
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
- Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things, Guangdong and Hong Kong Joint Research Centre for Optical Fiber Sensors, Shenzhen University, Shenzhen 518060, China
| | - Haoqiang Huang
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
- Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things, Guangdong and Hong Kong Joint Research Centre for Optical Fiber Sensors, Shenzhen University, Shenzhen 518060, China
| | - Cong Zhao
- Laboratory of Artificial Intelligence and Digital Economy (SZ), Shenzhen, 518000, China
| | - Mengqiang Zou
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
- Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things, Guangdong and Hong Kong Joint Research Centre for Optical Fiber Sensors, Shenzhen University, Shenzhen 518060, China
| | - Dejun Liu
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
- Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things, Guangdong and Hong Kong Joint Research Centre for Optical Fiber Sensors, Shenzhen University, Shenzhen 518060, China
| | - Xiaoyu Weng
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Liwei Liu
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Junle Qu
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Li Liu
- Department of Electronic Engineering, Chinese University of Hong Kong, Hong Kong, China
| | - Changrui Liao
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
- Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things, Guangdong and Hong Kong Joint Research Centre for Optical Fiber Sensors, Shenzhen University, Shenzhen 518060, China
| | - Yiping Wang
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
- Shenzhen Key Laboratory of Photonic Devices and Sensing Systems for Internet of Things, Guangdong and Hong Kong Joint Research Centre for Optical Fiber Sensors, Shenzhen University, Shenzhen 518060, China
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8
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di Toma A, Brunetti G, Chiriacò MS, Ferrara F, Ciminelli C. A Novel Hybrid Platform for Live/Dead Bacteria Accurate Sorting by On-Chip DEP Device. Int J Mol Sci 2023; 24:ijms24087077. [PMID: 37108235 PMCID: PMC10139405 DOI: 10.3390/ijms24087077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 03/23/2023] [Accepted: 04/05/2023] [Indexed: 04/29/2023] Open
Abstract
According to the World Health Organization (WHO) forecasts, Antimicrobial Resistance (AMR) will be the leading cause of death worldwide in the next decades. To prevent this phenomenon, rapid Antimicrobial Susceptibility Testing (AST) techniques are required to drive the selection of the most suitable antibiotic and its dosage. In this context, we propose an on-chip platform, based on a micromixer and a microfluidic channel, combined with a pattern of engineered electrodes to exploit the di-electrophoresis (DEP) effect. The role of the micromixer is to ensure the proper interaction of the antibiotic with the bacteria over a long time (≈1 h), and the DEP-based microfluidic channel enables the efficient sorting of live from dead bacteria. A sorting efficiency of more than 98%, with low power consumption (Vpp = 1 V) and time response of 5 s, within a chip footprint of ≈86 mm2, has been calculated, which makes the proposed system very attractive and innovative for efficient and rapid monitoring of the antimicrobial susceptibility at the single-bacterium level in next-generation medicine.
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Affiliation(s)
- Annarita di Toma
- Optoelectronics Laboratory, Politecnico di Bari, Via E. Orabona 6, 70125 Bari, Italy
| | - Giuseppe Brunetti
- Optoelectronics Laboratory, Politecnico di Bari, Via E. Orabona 6, 70125 Bari, Italy
| | | | - Francesco Ferrara
- CNR NANOTEC-Institute of Nanotechnology, Via per Monteroni, 73100 Lecce, Italy
| | - Caterina Ciminelli
- Optoelectronics Laboratory, Politecnico di Bari, Via E. Orabona 6, 70125 Bari, Italy
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9
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Bertelsen CV, Skands GE, González Díaz M, Dimaki M, Svendsen WE. Using Impedance Flow Cytometry for Rapid Viability Classification of Heat-Treated Bacteria. ACS OMEGA 2023; 8:7714-7721. [PMID: 36873038 PMCID: PMC9979241 DOI: 10.1021/acsomega.2c07357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 02/03/2023] [Indexed: 06/18/2023]
Abstract
In the future, rapid electrical characterization of cells with impedance flow cytometry promises to be a fast and accurate method for the evaluation of cell properties. In this paper, we investigate how the conductivity of the suspending medium along with the heat exposure time affects the viability classification of heat-treated E. coli. Using a theoretical model, we show that perforation of the bacteria membrane during heat exposure changes the impedance of the bacterial cell from effectively less conducting than the suspension medium to effectively more conducting. Consequently, this results in a shift in the differential argument of the complex electrical current that can be measured with impedance flow cytometry. We observe this shift experimentally through measurements on E. coli samples with varying medium conductivity and heat exposure times. We show that increased exposure time and lower medium conductivity results in improved classification between untreated and heat-treated bacteria. The best classification was achieved with a medium conductivity of 0.045 S/m after 30 min of heat exposure.
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Affiliation(s)
- Christian Vinther Bertelsen
- DTU
Bioengineering, Technical University of
Denmark, Søltofts Plads 221, 2800 Kgs Lyngby, Denmark
- SBT
Instruments A/S, Symfonivej
37, 2730 Herlev, Denmark
| | | | | | - Maria Dimaki
- DTU
Bioengineering, Technical University of
Denmark, Søltofts Plads 221, 2800 Kgs Lyngby, Denmark
| | - Winnie Edith Svendsen
- DTU
Bioengineering, Technical University of
Denmark, Søltofts Plads 221, 2800 Kgs Lyngby, Denmark
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10
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Chen YS, Huang CH, Pai PC, Seo J, Lei KF. A Review on Microfluidics-Based Impedance Biosensors. BIOSENSORS 2023; 13:bios13010083. [PMID: 36671918 PMCID: PMC9855525 DOI: 10.3390/bios13010083] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 12/20/2022] [Accepted: 12/28/2022] [Indexed: 05/30/2023]
Abstract
Electrical impedance biosensors are powerful and continuously being developed for various biological sensing applications. In this line, the sensitivity of impedance biosensors embedded with microfluidic technologies, such as sheath flow focusing, dielectrophoretic focusing, and interdigitated electrode arrays, can still be greatly improved. In particular, reagent consumption reduction and analysis time-shortening features can highly increase the analytical capabilities of such biosensors. Moreover, the reliability and efficiency of analyses are benefited by microfluidics-enabled automation. Through the use of mature microfluidic technology, complicated biological processes can be shrunk and integrated into a single microfluidic system (e.g., lab-on-a-chip or micro-total analysis systems). By incorporating electrical impedance biosensors, hand-held and bench-top microfluidic systems can be easily developed and operated by personnel without professional training. Furthermore, the impedance spectrum provides broad information regarding cell size, membrane capacitance, cytoplasmic conductivity, and cytoplasmic permittivity without the need for fluorescent labeling, magnetic modifications, or other cellular treatments. In this review article, a comprehensive summary of microfluidics-based impedance biosensors is presented. The structure of this article is based on the different substrate material categorizations. Moreover, the development trend of microfluidics-based impedance biosensors is discussed, along with difficulties and challenges that may be encountered in the future.
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Affiliation(s)
- Yu-Shih Chen
- Department of Biomedical Engineering, Chang Gung University, Taoyuan 33302, Taiwan
| | - Chun-Hao Huang
- Department of Biomedical Engineering, Chang Gung University, Taoyuan 33302, Taiwan
| | - Ping-Ching Pai
- Department of Radiation Oncology, Linkou Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan
| | - Jungmok Seo
- Department of Biomedical Engineering, Chang Gung University, Taoyuan 33302, Taiwan
- Department of Electrical & Electronic Engineering, Yonsei University, Seoul 120-749, Republic of Korea
| | - Kin Fong Lei
- Department of Biomedical Engineering, Chang Gung University, Taoyuan 33302, Taiwan
- Department of Radiation Oncology, Linkou Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan
- Department of Electrical & Electronic Engineering, Yonsei University, Seoul 120-749, Republic of Korea
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11
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Nakata N, Ishibashi Y, Miyata S. Efficient Cell Impedance Measurement by Dielectrophoretic Cell Accumulation and Evaluation of Chondrogenic Phenotypes. MICROMACHINES 2022; 13:mi13060837. [PMID: 35744451 PMCID: PMC9230527 DOI: 10.3390/mi13060837] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 05/22/2022] [Accepted: 05/24/2022] [Indexed: 02/04/2023]
Abstract
The quantitative and functional analyses of cells are important for cell-based therapies. In this study, to establish the quantitative cell analysis method, we propose an impedance measurement method supported by dielectrophoretic cell accumulation. An impedance measurement and dielectrophoresis device was constructed using opposing comb-shaped electrodes. Using dielectrophoresis, cells were accumulated to form chain-like aggregates on the electrodes to improve the measurement sensitivity of the electrical impedance device. To validate the proposed method, the electrical impedance and capacitance of primary and de-differentiated chondrocytes were measured. As a result, the impedance of the chondrocytes decreased with an increase in the passage number, whereas the capacitance increased. Therefore, the impedance measurement method proposed in this study has the potential to identify chondrocyte phenotypes.
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Affiliation(s)
- Natsumi Nakata
- Department of Mechanical Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Yokohama 223-8522, Japan;
| | - Yuko Ishibashi
- Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Yokohama 223-8522, Japan;
| | - Shogo Miyata
- Department of Mechanical Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Yokohama 223-8522, Japan;
- Correspondence: ; Tel.: +81-45-566-1827
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12
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Zhang Z, Huang X, Liu K, Lan T, Wang Z, Zhu Z. Recent Advances in Electrical Impedance Sensing Technology for Single-Cell Analysis. BIOSENSORS 2021; 11:470. [PMID: 34821686 PMCID: PMC8615761 DOI: 10.3390/bios11110470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 11/15/2021] [Accepted: 11/17/2021] [Indexed: 05/10/2023]
Abstract
Cellular heterogeneity is of significance in cell-based assays for life science, biomedicine and clinical diagnostics. Electrical impedance sensing technology has become a powerful tool, allowing for rapid, non-invasive, and label-free acquisition of electrical parameters of single cells. These electrical parameters, i.e., equivalent cell resistance, membrane capacitance and cytoplasm conductivity, are closely related to cellular biophysical properties and dynamic activities, such as size, morphology, membrane intactness, growth state, and proliferation. This review summarizes basic principles, analytical models and design concepts of single-cell impedance sensing devices, including impedance flow cytometry (IFC) to detect flow-through single cells and electrical impedance spectroscopy (EIS) to monitor immobilized single cells. Then, recent advances of both electrical impedance sensing systems applied in cell recognition, cell counting, viability detection, phenotypic assay, cell screening, and other cell detection are presented. Finally, prospects of impedance sensing technology in single-cell analysis are discussed.
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Affiliation(s)
- Zhao Zhang
- Key Laboratory of MEMS of Ministry of Education, Southeast University, Sipailou 2, Nanjing 210018, China; (Z.Z.); (K.L.); (T.L.)
| | - Xiaowen Huang
- The First Affiliated Hospital of Nanjing Medical University (Jiangsu Province Hospital), Department of Orthopedics, Nanjing 210029, China;
| | - Ke Liu
- Key Laboratory of MEMS of Ministry of Education, Southeast University, Sipailou 2, Nanjing 210018, China; (Z.Z.); (K.L.); (T.L.)
| | - Tiancong Lan
- Key Laboratory of MEMS of Ministry of Education, Southeast University, Sipailou 2, Nanjing 210018, China; (Z.Z.); (K.L.); (T.L.)
| | - Zixin Wang
- School of Electronics and Information Technology, Sun Yat-Sen University, Xingang Xi Road 135, Guangzhou 510275, China;
| | - Zhen Zhu
- Key Laboratory of MEMS of Ministry of Education, Southeast University, Sipailou 2, Nanjing 210018, China; (Z.Z.); (K.L.); (T.L.)
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13
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Hartmann FSF, Anastasiou I, Weiß T, Shen J, Seibold GM. Impedance flow cytometry for viability analysis of Corynebacterium glutamicum. J Microbiol Methods 2021; 191:106347. [PMID: 34656671 DOI: 10.1016/j.mimet.2021.106347] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 10/12/2021] [Accepted: 10/12/2021] [Indexed: 11/15/2022]
Abstract
Corynebacterium glutamicum efficiently produces glutamate when growth is inhibited. Analyses of viability in this non-growing state requires time consuming plating and determination of colony forming units. We here establish impedance flow cytometry measurements to assess the viability of non-growing, glutamate producing C. glutamicum cultures within minutes.
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Affiliation(s)
- Fabian Stefan Franz Hartmann
- Department of Biotechnology and Biomedicine, Section for Synthetic Biology, Technical University of Denmark, Kongens, Lyngby, Denmark
| | - Ioannis Anastasiou
- Department of Biotechnology and Biomedicine, Section for Synthetic Biology, Technical University of Denmark, Kongens, Lyngby, Denmark
| | - Tamara Weiß
- Department of Biotechnology and Biomedicine, Section for Synthetic Biology, Technical University of Denmark, Kongens, Lyngby, Denmark
| | - Jing Shen
- Department of Biotechnology and Biomedicine, Section for Synthetic Biology, Technical University of Denmark, Kongens, Lyngby, Denmark
| | - Gerd Michael Seibold
- Department of Biotechnology and Biomedicine, Section for Synthetic Biology, Technical University of Denmark, Kongens, Lyngby, Denmark.
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14
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Zhang F, Wang S, Yang Y, Jiang J, Tao N. Imaging Single Bacterial Cells with Electro-optical Impedance Microscopy. ACS Sens 2021; 6:348-354. [PMID: 32456424 DOI: 10.1021/acssensors.0c00751] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Impedance measurements have been an important tool for biosensor applications, including protein detection, DNA quantification, and cell study. We present here an electro-optical impedance microscopy (EIM) based on the dependence of surface optical transmission on local surface charge density for single bacteria impedance imaging. We applied a potential modulation to bacteria placed on an indium tin oxide-coated slide and simultaneously recorded a sequence of transmitted microscopy images. By performing fast Fourier transform analysis on the image sequences, we obtained the DC component (signal at 0 Hz) for cell morphology imaging and the AC component (signal at the modulation frequency) for the mapping of cell impedance responses with subcellular resolution for the first time. Using this method, we have monitored the viability of Escherichia coli bacterial cells under treatment with two different classes of antibiotics with low-frequency potential modulation. The results showed that the impedance response is sensitive to the antibiotic that targets the bacterial cell membrane as the membrane capacitance dominated at low-frequency modulation. Heterogeneous responses to the antibiotic treatment were observed at a single bacteria level. In addition to the high spatial resolution, EIM is label-free and simple and can be potentially used for the continuous mapping of single bacteria impedance changes under different conditions.
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Affiliation(s)
- Fenni Zhang
- Biodesign Center for Bioelectronics and Biosensors, Arizona State University, Tempe, Arizona 85287-5801, United States
| | - Shaopeng Wang
- Biodesign Center for Bioelectronics and Biosensors, Arizona State University, Tempe, Arizona 85287-5801, United States
| | - Yunze Yang
- Biodesign Center for Bioelectronics and Biosensors, Arizona State University, Tempe, Arizona 85287-5801, United States
| | - Jiapei Jiang
- Biodesign Center for Bioelectronics and Biosensors, Arizona State University, Tempe, Arizona 85287-5801, United States
- School of Biological and Health Systems Engineering, Arizona State University, Tempe, Arizona 85287, United States
| | - Nongjian Tao
- Biodesign Center for Bioelectronics and Biosensors, Arizona State University, Tempe, Arizona 85287-5801, United States
- School of Electrical Computer and Energy Engineering, Arizona State University, Tempe, Arizona 85287, United States
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15
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Bertelsen CV, Franco JC, Skands GE, Dimaki M, Svendsen WE. Investigating the Use of Impedance Flow Cytometry for Classifying the Viability State of E. coli. SENSORS (BASEL, SWITZERLAND) 2020; 20:E6339. [PMID: 33172055 PMCID: PMC7664255 DOI: 10.3390/s20216339] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 10/29/2020] [Accepted: 11/03/2020] [Indexed: 01/22/2023]
Abstract
Bacteria detection, counting and analysis is of great importance in several fields. When viability plays a major role in decision making, the counting of colony-forming units grown on agar plates remains the gold standard. However, because plate counts depend on the growth of the bacteria, it is a slow procedure and only works with culturable species. Impedance flow cytometry (IFC) is a promising technology for particle detection, counting and characterization. It relies on the perturbation of an electric field by particles flowing through a microfluidic channel. The perturbation is directly related to the electrical properties of the particles, and therefore provides information about their composition and structure. In this work we investigate whether IFC can be used to differentiate viable cells from inactivated cells. Our findings demonstrate that the specific viability state of the bacteria has to be considered, but that with proper characterization thresholds, IFC can be used to classify bacterial viability states. By using three different inactivation methods-ethanol, heat and autoclavation-we have been able to show that the impedance response of Escherichia coli depends on its viability state, but that the specific response depends on the inactivation method. With these findings we expect to be able to optimize IFC for more reliable bacteria detection and counting in the future.
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Affiliation(s)
- Christian Vinther Bertelsen
- DTU Bioengineering, Technical University of Denmark, Søltofts Plads 221, 2800 Kgs. Lyngby, Denmark; (J.C.F.); (M.D.); (W.E.S.)
- SBT Instruments A/S, Symfonivej 37, 2730 Herlev, Denmark;
| | - Julio César Franco
- DTU Bioengineering, Technical University of Denmark, Søltofts Plads 221, 2800 Kgs. Lyngby, Denmark; (J.C.F.); (M.D.); (W.E.S.)
| | | | - Maria Dimaki
- DTU Bioengineering, Technical University of Denmark, Søltofts Plads 221, 2800 Kgs. Lyngby, Denmark; (J.C.F.); (M.D.); (W.E.S.)
| | - Winnie Edith Svendsen
- DTU Bioengineering, Technical University of Denmark, Søltofts Plads 221, 2800 Kgs. Lyngby, Denmark; (J.C.F.); (M.D.); (W.E.S.)
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16
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Canonge J, Philippot M, Leblanc C, Potin P, Bodin M. Impedance flow cytometry allows the early prediction of embryo yields in wheat (Triticum aestivum L.) microspore cultures. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2020; 300:110586. [PMID: 33180700 DOI: 10.1016/j.plantsci.2020.110586] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 06/24/2020] [Accepted: 06/27/2020] [Indexed: 05/12/2023]
Abstract
Haplomethods are key biotechnological tools that make it possible to rapidly produce perfectly homozygous lines, speeding up plant breeding programs. Under specific stress conditions, microspores are reprogrammed toward sporophytic pathways, leading to embryo formation. Various endogenous and exogenous factors affect embryo yield in androgenesis, so the improvement of androgenesis efficiency requires the development of early, reliable and robust reactivity markers. During the last decade, numerous cytological, cellular and biochemical approaches were carried out to finely characterize microspore development and fate during androgenesis. However, the different available markers are often species-dependent, and their development and application are time-consuming and cumbersome. In this study, we show the suitable use of impedance flow cytometry (IFC) to develop new robust, reliable and strong markers of androgenesis reactivity in wheat, leading to: (i) routine monitoring of the viability of heterogeneous cell cultures; (ii) quick and simple evaluation of stress treatment efficiency; and (iii) early prediction of embryo yields from microspore suspensions. IFC can therefore provide the fine characterization of all of the microspore developmental pathways that occur in a cell suspension, for embryogenic microspores as well as pollen-like microspores. IFC technology has become a very useful tool to track and characterize wheat microspores in androgenesis, but can also be adapted to other species and other in vitro cell culture systems.
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Affiliation(s)
- Julie Canonge
- Vegenov, Pen ar Prat, 29250 Saint-Pol-de-Léon, France
| | | | - Catherine Leblanc
- CNRS, Sorbonne Université Sciences, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688 Roscoff, France
| | - Philippe Potin
- CNRS, Sorbonne Université Sciences, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688 Roscoff, France
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17
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Yang N, Hu J, Zhou X, Wang A, Yu J, Tao X, Tang J. A rapid detection method of early spore viability based on
AC
impedance measurement. J FOOD PROCESS ENG 2020. [DOI: 10.1111/jfpe.13520] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Ning Yang
- School of Electrical and Information Engineering, Jiangsu University Zhenjiang China
| | - Jiaqi Hu
- School of Electrical and Information Engineering, Jiangsu University Zhenjiang China
| | - Xu Zhou
- School of Electrical and Information Engineering, Jiangsu University Zhenjiang China
| | - Aiying Wang
- State Key Laboratory of Rice Biology China National Rice Research Institute Hangzhou China
| | - Junjie Yu
- School of Electrical and Information Engineering, Jiangsu University Zhenjiang China
| | - Xinyi Tao
- Viterbi Engineering School University of Southern California Los Angeles USA
| | - Jian Tang
- State Key Laboratory of Rice Biology China National Rice Research Institute Hangzhou China
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18
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Ma G, Soleimani M. A New Label-Free and Contactless Bio-Tomographic Imaging with Miniaturized Capacitively-Coupled Spectroscopy Measurements. SENSORS 2020; 20:s20113327. [PMID: 32545282 PMCID: PMC7308860 DOI: 10.3390/s20113327] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 06/04/2020] [Accepted: 06/08/2020] [Indexed: 12/31/2022]
Abstract
A new bio-imaging method has been developed by introducing an experimental verification of capacitively coupled resistivity imaging in a small scale. This paper focuses on the 2D circular array imaging sensor as well as a 3D planar array imaging sensor with spectroscopic measurements in a wide range from low frequency to radiofrequency. Both these two setups are well suited for standard containers used in cell and culture biological studies, allowing for fully non-invasive testing. This is true as the capacitive based imaging sensor can extract dielectric spectroscopic images from the sample without direct contact with the medium. The paper shows the concept by deriving a wide range of spectroscopic information from biological test samples. We drive both spectra of electrical conductivity and the change rate of electrical conductivity with frequency as a piece of fundamentally important information. The high-frequency excitation allows the interrogation of critical properties that arise from the cell nucleus.
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19
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Gnaim R, Golberg A, Sheviryov J, Rubinsky B, González CA. Detection and differentiation of bacteria by electrical bioimpedance spectroscopy. Biotechniques 2020; 69:384-394. [PMID: 32486835 DOI: 10.2144/btn-2019-0080] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Detecting bacteria in samples and differentiating between Gram-negative and Gram-positive species is an important challenge, and the most common method, Gram staining, is very time consuming. The aim of this study was to evaluate the electrical bioimpedance spectroscopy (EBIS) technique as an inexpensive and practical tool for real-time detection of bacteria and differentiation between Gram-positive and Gram-negative species. The relevant sensitivity for differentiating between species was found in the magnitude and phase at frequencies of 158,489 and 5248 Hz, respectively, at a bacterial concentration of 1 μg/μl. Subsequently, the sensitivity was estimated as a function of bacterial concentration. Our results demonstrated that EBIS can potentially distinguish between presence and absence of bacteria as well as between different types of bacteria.
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Affiliation(s)
- Rima Gnaim
- Porter School of Environment & Earth Sciences, Tel Aviv University. Tel Aviv-Yafo, Israel.,The Triangle Regional Research & Development Center, Kfar Qari' 30075, Israel
| | - Alexander Golberg
- Porter School of Environment & Earth Sciences, Tel Aviv University. Tel Aviv-Yafo, Israel
| | - Julia Sheviryov
- Porter School of Environment & Earth Sciences, Tel Aviv University. Tel Aviv-Yafo, Israel
| | - Boris Rubinsky
- Mechanical Engineering Department, University of California-Berkeley, CA, USA
| | - César A González
- Porter School of Environment & Earth Sciences, Tel Aviv University. Tel Aviv-Yafo, Israel.,Escuela Superior de Medicina-Instituto Politécnico Nacional, Mexico City, Mexico
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20
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Wang L, Sha Y, Wu D, Wei Q, Chen D, Yang S, Jia F, Yuan Q, Han X, Wang J. Surfactant induces ROS-mediated cell membrane permeabilization for the enhancement of mannatide production. Process Biochem 2020. [DOI: 10.1016/j.procbio.2019.12.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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21
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Impe D, Reitz J, Köpnick C, Rolletschek H, Börner A, Senula A, Nagel M. Assessment of Pollen Viability for Wheat. FRONTIERS IN PLANT SCIENCE 2020; 10:1588. [PMID: 32038666 PMCID: PMC6987437 DOI: 10.3389/fpls.2019.01588] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 11/12/2019] [Indexed: 05/15/2023]
Abstract
Wheat sheds tricellular short-lived pollen at maturity. The identification of viable pollen required for high seed set is important for breeders and conservators. The present study aims to evaluate and improve pollen viability tests and to identify factors influencing viability of pollen. In fresh wheat pollen, sucrose was the most abundant soluble sugar (90%). Raffinose was present in minor amounts. However, the analyses of pollen tube growth on 112 liquid and 45 solid media revealed that solid medium with 594 mM raffinose, 0.81 mM H3BO3, 2.04 mM CaCl2 at pH5.8 showed highest pollen germination. Partly or complete substitution of raffinose by sucrose, maltose, or sorbitol reduced in vitro germination of the pollen assuming a higher metabolic efficiency or antioxidant activity of raffinose. In vitro pollen germination varied between 26 lines (P < 0.001); between winter (15.3 ± 8.5%) and spring types (30.2 ± 13.3%) and was highest for the spring wheat TRI 2443 (50.1 ± 20.0%). Alexander staining failed to discriminate between viable, fresh pollen, and non-viable pollen inactivated by ambient storage for >60 min. Viability of fresh wheat pollen assessed by fluorescein diacetate (FDA) staining and impedance flow (IF) cytometry was 79.2 ± 4.2% and 88.1 ± 2.7%, respectively; and, when non-viable, stored pollen was additionally tested, it correlated at r = 0.54 (P < 0.05) and r = 0.67 (P < 0.001) with in vitro germination, respectively. When fresh pollen was used to assess the pollen viability of 19 wheat, 25 rye, 11 barley, and 4 maize lines, correlations were absent and in vitro germination was lower for rye (11.7 ± 8.5%), barley (6.8 ± 4.3%), and maize (2.1 ± 1.8%) pollen compared to wheat. Concluding, FDA staining and IF cytometry are used for a range of pollen species, whereas media for in vitro pollen germination require specific adaptations; in wheat, a solid medium with raffinose was chosen. On adapted media, the pollen tube growth can be exactly analyzed whereas results achieved by FDA staining and IF cytometry are higher and may overestimate pollen tube growth. Hence, as the exact viability and fertilization potential of a larger pollen batch remains elusive, a combination of pollen viability tests may provide reasonable indications of the ability of pollen to germinate and grow.
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Affiliation(s)
- Daniela Impe
- Genebank Department, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Seeland, Germany
| | - Janka Reitz
- Genebank Department, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Seeland, Germany
| | - Claudia Köpnick
- Genebank Department, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Seeland, Germany
| | - Hardy Rolletschek
- Department of Molecular Genetics, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Seeland, Germany
| | - Andreas Börner
- Genebank Department, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Seeland, Germany
| | - Angelika Senula
- Genebank Department, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Seeland, Germany
| | - Manuela Nagel
- Genebank Department, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Seeland, Germany
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22
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Schwarz M, Jendrusch M, Constantinou I. Spatially resolved electrical impedance methods for cell and particle characterization. Electrophoresis 2019; 41:65-80. [PMID: 31663624 DOI: 10.1002/elps.201900286] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 10/25/2019] [Accepted: 10/25/2019] [Indexed: 12/24/2022]
Abstract
Electrical impedance is an established technique used for cell and particle characterization. The temporal and spectral resolution of electrical impedance have been used to resolve basic cell characteristics like size and type, as well as to determine cell viability and activity. Such electrical impedance measurements are typically performed across the entire sample volume and can only provide an overall indication concerning the properties and state of that sample. For the study of heterogeneous structures such as cell layers, biological tissue, or polydisperse particle mixtures, an overall measured impedance value can only provide limited information and can lead to data misinterpretation. For the investigation of localized sample properties in complex heterogeneous structures/mixtures, the addition of spatial resolution to impedance measurements is necessary. Several spatially resolved impedance measurement techniques have been developed and applied to cell and particle research, including electrical impedance tomography, scanning electrochemical microscopy, and microelectrode arrays. This review provides an overview of spatially resolved impedance measurement methods and assesses their applicability for cell and particle characterization.
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Affiliation(s)
- Marvin Schwarz
- Institute of Microtechnology, Technische Universität Braunschweig, Braunschweig, Germany.,Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, Braunschweig, Germany
| | | | - Iordania Constantinou
- Institute of Microtechnology, Technische Universität Braunschweig, Braunschweig, Germany.,Center of Pharmaceutical Engineering (PVZ), Technische Universität Braunschweig, Braunschweig, Germany
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23
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Yu X, Yin H, Peng H, Lu G, Dang Z. Oxidation degradation of tris-(2-chloroisopropyl) phosphate by ultraviolet driven sulfate radical: Mechanisms and toxicology assessment of degradation intermediates using flow cytometry analyses. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 687:732-740. [PMID: 31412476 DOI: 10.1016/j.scitotenv.2019.06.163] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 06/08/2019] [Accepted: 06/11/2019] [Indexed: 06/10/2023]
Abstract
Organophosphate flame retardants (OPFRs) were frequently detected in biotic and abiotic matrix owing to their persistence and recalcitrant degradation. Some specific OPFRs, such as tris-(2-chloroisopropyl) phosphate (TCPP), pose a significant potential risk to human health due to their high water solubility. Therefore, an environmentally sound and high efficient technique is in urgent need of controlling TCPP. This research is focused on degrading TCPP using ultraviolet-persulfate (UV/PS) technique. The degradation reaction of TCPP followed a pseudo-first order kinetics with an apparent rate constant (kobs) at 0.1653 min-1. As the photocatalytic reaction proceeded, TCPP was transformed to twelve degradation intermediates via the selective electron-transfer reactions induced by activated sulfate radical. Anions existence and pH value significantly inhibited the degradation efficiency, implying that it was hard for TCPP to reach up to complete mineralization in actual water treatment process. Additionally, toxicological assessment of degradation intermediate mixture was conducted using Flow cytometry (FCM) analyses, and the result showed that the intracellular reactive oxygen species (ROS) and cell apoptotic rates significantly declined, and membrane potential (MP) increased in comparison with original TCPP. On the other hand, the negative impacts of these degradation products on DNA biosynthesis in Escherichia coli were weakened based on cell cycle analysis, all of which indicated that toxicity of these degradation intermediates was obviously reduced via UV/PS treatment. To summarize, an appropriate mineralization is effective for TCPP detoxification, suggesting the feasibility of TCPP control using UV/PS treatment in water matrix.
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Affiliation(s)
- Xiaolong Yu
- Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, Guangdong, China
| | - Hua Yin
- Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, Guangdong, China.
| | - Hui Peng
- Department of Chemistry, Jinan University, Guangzhou, 510632, Guangdong, China
| | - Guining Lu
- Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, Guangdong, China
| | - Zhi Dang
- Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, Guangdong, China
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24
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Opitz C, Schade G, Kaufmann S, Di Berardino M, Ottiger M, Grzesiek S. Rapid determination of general cell status, cell viability, and optimal harvest time in eukaryotic cell cultures by impedance flow cytometry. Appl Microbiol Biotechnol 2019; 103:8619-8629. [PMID: 31396681 DOI: 10.1007/s00253-019-10046-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 07/15/2019] [Accepted: 07/23/2019] [Indexed: 10/26/2022]
Abstract
The determination of cell viability is essential to many areas of life sciences and biotechnology. Typically, cell viability measurements are based on the optical analysis of stained cells, which requires additional labeling steps and is hard to implement online. Frequency-dependent impedance flow cytometry (IFC) provides a label-free, fast, and reliable alternative to determine cell viability at the single cell level based on the Coulter principle. Here, we describe the application of IFC to eukaryotic cell cultures and compare the results to commonly used staining methods. Yeast cell parameters were assessed in normal and heat-inactivated cells as well as in alcoholic fermentation and long-term batch cultures providing a precise and fast determination of the cell viability and further quantitative measures of the cell culture status. As an important new application, we have investigated recombinant protein production in the widely used baculovirus insect cell expression system. The IFC analysis revealed the presence of a subpopulation of cells, which correlates with the protein expression yield, but it is not detectable with conventional optical cell counters. We tentatively identify this subpopulation as cells in the late phase of infection. Their detection can serve as a predictor for the optimal time point of harvest. The IFC technique should be generally applicable to many eukaryotic cell cultures in suspension, possibly also implemented online.
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Affiliation(s)
- Christian Opitz
- Focal Area Structural Biology and Biophysics, Biozentrum, University of Basel, 4056, Basel, Switzerland
| | - Grit Schade
- Amphasys, Technopark Lucerne, 6039, Root, Switzerland
| | | | | | | | - Stephan Grzesiek
- Focal Area Structural Biology and Biophysics, Biozentrum, University of Basel, 4056, Basel, Switzerland.
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25
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Ahuja K, Rather GM, Lin Z, Sui J, Xie P, Le T, Bertino JR, Javanmard M. Toward point-of-care assessment of patient response: a portable tool for rapidly assessing cancer drug efficacy using multifrequency impedance cytometry and supervised machine learning. MICROSYSTEMS & NANOENGINEERING 2019; 5:34. [PMID: 31645995 PMCID: PMC6799891 DOI: 10.1038/s41378-019-0073-2] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Revised: 01/31/2019] [Accepted: 03/25/2019] [Indexed: 05/07/2023]
Abstract
We present a novel method to rapidly assess drug efficacy in targeted cancer therapy, where antineoplastic agents are conjugated to antibodies targeting surface markers on tumor cells. We have fabricated and characterized a device capable of rapidly assessing tumor cell sensitivity to drugs using multifrequency impedance spectroscopy in combination with supervised machine learning for enhanced classification accuracy. Currently commercially available devices for the automated analysis of cell viability are based on staining, which fundamentally limits the subsequent characterization of these cells as well as downstream molecular analysis. Our approach requires as little as 20 μL of volume and avoids staining allowing for further downstream molecular analysis. To the best of our knowledge, this manuscript presents the first comprehensive attempt to using high-dimensional data and supervised machine learning, particularly phase change spectra obtained from multi-frequency impedance cytometry as features for the support vector machine classifier, to assess viability of cells without staining or labelling.
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Affiliation(s)
- Karan Ahuja
- Department of Electrical and Computer Engineering, Rutgers University, New Brunswick, NJ USA
| | - Gulam M. Rather
- Rutgers Cancer Institute of New Jersey, Rutgers University, New Brunswick, NJ USA
| | - Zhongtian Lin
- Department of Electrical and Computer Engineering, Rutgers University, New Brunswick, NJ USA
| | - Jianye Sui
- Department of Electrical and Computer Engineering, Rutgers University, New Brunswick, NJ USA
| | - Pengfei Xie
- Department of Electrical and Computer Engineering, Rutgers University, New Brunswick, NJ USA
| | - Tuan Le
- Department of Electrical and Computer Engineering, Rutgers University, New Brunswick, NJ USA
| | - Joseph R. Bertino
- Rutgers Cancer Institute of New Jersey, Rutgers University, New Brunswick, NJ USA
| | - Mehdi Javanmard
- Department of Electrical and Computer Engineering, Rutgers University, New Brunswick, NJ USA
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Conteduca D, Brunetti G, Dell'Olio F, Armenise MN, Krauss TF, Ciminelli C. Monitoring of individual bacteria using electro-photonic traps. BIOMEDICAL OPTICS EXPRESS 2019; 10:3463-3471. [PMID: 31467790 PMCID: PMC6706028 DOI: 10.1364/boe.10.003463] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 05/17/2019] [Accepted: 05/20/2019] [Indexed: 05/07/2023]
Abstract
Antimicrobial resistance (AMR) describes the ability of bacteria to become immune to antimicrobial treatments. Current testing for AMR is based on culturing methods that are very slow because they assess the average response of billions of bacteria. In principle, if tests were available that could assess the response of individual bacteria, they could be much faster. Here, we propose an electro-photonic approach for the analysis and the monitoring of susceptibility at the single-bacterium level. Our method employs optical tweezers based on photonic crystal cavities for the trapping of individual bacteria. While the bacteria are trapped, antibiotics can be added to the medium and the corresponding changes in the optical properties and motility of the bacteria be monitored via changes of the resonance wavelength and transmission. Furthermore, the proposed assay is able to monitor the impedance of the medium surrounding the bacterium, which allows us to record changes in metabolic rate in response to the antibiotic challenge. For example, our simulations predict a variation in measurable electrical current of up to 40% between dead and live bacteria. The proposed platform is the first, to our knowledge, that allows the parallel study of both the optical and the electrical response of individual bacteria to antibiotic challenge. Our platform opens up new lines of enquiry for monitoring the response of bacteria and it could lead the way towards the dissemination of a new generation of antibiogram study, which is relevant for the development of a point-of-care AMR diagnostics.
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Affiliation(s)
- Donato Conteduca
- Optoelectronics Laboratory, Politecnico di Bari, Via Orabona, 4, 70125, Bari, Italy
- Photonics Group, Department of Physics, University of York, Heslington, York, YO10 5DD, UK
| | - Giuseppe Brunetti
- Optoelectronics Laboratory, Politecnico di Bari, Via Orabona, 4, 70125, Bari, Italy
| | - Francesco Dell'Olio
- Optoelectronics Laboratory, Politecnico di Bari, Via Orabona, 4, 70125, Bari, Italy
| | - Mario N Armenise
- Optoelectronics Laboratory, Politecnico di Bari, Via Orabona, 4, 70125, Bari, Italy
| | - Thomas F Krauss
- Photonics Group, Department of Physics, University of York, Heslington, York, YO10 5DD, UK
| | - Caterina Ciminelli
- Optoelectronics Laboratory, Politecnico di Bari, Via Orabona, 4, 70125, Bari, Italy
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Bacteria Detection and Differentiation Using Impedance Flow Cytometry. SENSORS 2018; 18:s18103496. [PMID: 30336557 PMCID: PMC6210208 DOI: 10.3390/s18103496] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Revised: 10/11/2018] [Accepted: 10/15/2018] [Indexed: 12/01/2022]
Abstract
Monitoring of bacteria concentrations is of great importance in drinking water management. Continuous real-time monitoring enables better microbiological control of the water and helps prevent contaminated water from reaching the households. We have developed a microfluidic sensor with the potential to accurately assess bacteria levels in drinking water in real-time. Multi frequency electrical impedance spectroscopy is used to monitor a liquid sample, while it is continuously passed through the sensor. We investigate three aspects of this sensor: First we show that the sensor is able to differentiate Escherichia coli (Gram-negative) bacteria from solid particles (polystyrene beads) based on an electrical response in the high frequency phase and individually enumerate the two samples. Next, we demonstrate the sensor’s ability to measure the bacteria concentration by comparing the results to those obtained by the traditional CFU counting method. Last, we show the sensor’s potential to distinguish between different bacteria types by detecting different signatures for S. aureus and E. coli mixed in the same sample. Our investigations show that the sensor has the potential to be extremely effective at detecting sudden bacterial contaminations found in drinking water, and eventually also identify them.
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Valavade AV, Date KS, Press MR, Kothari DC. Scanning Dielectric Constant Microscopy for imaging single biological cells. Biomed Phys Eng Express 2018. [DOI: 10.1088/2057-1976/aada1c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Abstract
Bacterial populations harbor a small fraction of cells that display transient multidrug tolerance. These so-called persister cells are extremely difficult to eradicate and contribute to the recalcitrance of chronic infections. Several signaling pathways leading to persistence have been identified. However, it is poorly understood how the effectors of these pathways function at the molecular level. In a previous study, we reported that the conserved GTPase Obg induces persistence in Escherichia coli via transcriptional upregulation of the toxin HokB. In the present study, we demonstrate that HokB inserts in the cytoplasmic membrane where it forms pores. The pore-forming capacity of the HokB peptide is demonstrated by in vitro conductance measurements on synthetic and natural lipid bilayers, revealing an asymmetrical conductance profile. Pore formation is directly linked to persistence and results in leakage of intracellular ATP. HokB-induced persistence is strongly impeded in the presence of a channel blocker, thereby providing a direct link between pore functioning and persistence. Furthermore, the activity of HokB pores is sensitive to the membrane potential. This sensitivity presumably results from the formation of either intermediate or mature pore types depending on the membrane potential. Taken together, these results provide a detailed view on the mechanistic basis of persister formation through the effector HokB.IMPORTANCE There is increasing awareness of the clinical importance of persistence. Indeed, persistence is linked to the recalcitrance of chronic infections, and evidence is accumulating that persister cells constitute a pool of viable cells from which resistant mutants can emerge. Unfortunately, persistence is a poorly understood process at the mechanistic level. In this study, we unraveled the pore-forming activity of HokB in E. coli and discovered that these pores lead to leakage of intracellular ATP, which is correlated with the induction of persistence. Moreover, we established a link between persistence and pore activity, as the number of HokB-induced persister cells was strongly reduced using a channel blocker. The latter opens opportunities to reduce the number of persister cells in a clinical setting.
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Rosenthal K, Oehling V, Dusny C, Schmid A. Beyond the bulk: disclosing the life of single microbial cells. FEMS Microbiol Rev 2017; 41:751-780. [PMID: 29029257 PMCID: PMC5812503 DOI: 10.1093/femsre/fux044] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Accepted: 09/08/2017] [Indexed: 01/08/2023] Open
Abstract
Microbial single cell analysis has led to discoveries that are beyond what can be resolved with population-based studies. It provides a pristine view of the mechanisms that organize cellular physiology, unbiased by population heterogeneity or uncontrollable environmental impacts. A holistic description of cellular functions at the single cell level requires analytical concepts beyond the miniaturization of existing technologies, defined but uncontrolled by the biological system itself. This review provides an overview of the latest advances in single cell technologies and demonstrates their potential. Opportunities and limitations of single cell microbiology are discussed using selected application-related examples.
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Affiliation(s)
- Katrin Rosenthal
- Department Solar Materials, Helmholtz Centre for Environmental Research (UFZ), Leipzig, Germany
- Laboratory of Chemical Biotechnology, Department of Biochemical & Chemical Engineering, TU Dortmund University, Dortmund, Germany
| | - Verena Oehling
- Department Solar Materials, Helmholtz Centre for Environmental Research (UFZ), Leipzig, Germany
- Laboratory of Chemical Biotechnology, Department of Biochemical & Chemical Engineering, TU Dortmund University, Dortmund, Germany
| | - Christian Dusny
- Department Solar Materials, Helmholtz Centre for Environmental Research (UFZ), Leipzig, Germany
| | - Andreas Schmid
- Department Solar Materials, Helmholtz Centre for Environmental Research (UFZ), Leipzig, Germany
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Rollo E, Tenaglia E, Genolet R, Bianchi E, Harari A, Coukos G, Guiducci C. Label-free identification of activated T lymphocytes through tridimensional microsensors on chip. Biosens Bioelectron 2017; 94:193-199. [PMID: 28284079 DOI: 10.1016/j.bios.2017.02.047] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2016] [Revised: 02/15/2017] [Accepted: 02/28/2017] [Indexed: 11/25/2022]
Abstract
Label-free approaches to assess cell properties ideally suit the requirements of cell-based therapeutics, since they permit to characterize cells with minimal perturbation and manipulation, at the benefit of sample recovery and re-employment for treatment. For this reason, label-free techniques would find sensible application in adoptive T cell-based immunotherapy. In this work, we describe the label-free and single-cell detection of in vitro activated T lymphocytes in flow through an electrical impedance-based setup. We describe a novel platform featuring 3D free-standing microelectrodes presenting passive upstream and downstream extensions and integrated into microfluidic channels. We employ such device to measure the impedance change associated with T cell activation at electrical frequencies maximizing the difference between non-activated and activated T cells. Finally, we harness the impedance signature of unstimulated T cells to set a boundary separating activated and non-activated clones, so to characterize the selectivity and specificity of the system. In conclusion, the strategy here proposed highlights the possible employment of impedance to assess T cell activation in label-free.
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Affiliation(s)
- Enrica Rollo
- Laboratory of Life Sciences Electronics - Swiss Federal Institute of Technology (EPFL), Lausanne CH-1015, Switzerland
| | - Enrico Tenaglia
- Laboratory of Life Sciences Electronics - Swiss Federal Institute of Technology (EPFL), Lausanne CH-1015, Switzerland
| | - Raphaël Genolet
- Ludwig Center for Cancer Research - University of Lausanne (UNIL), CH-1066, Switzerland
| | - Elena Bianchi
- CMIC "Giulio Natta", LaBS - Laboratory of Biological Structure Mechanics - Politecnico di Milano, I-20133, Italy
| | - Alexandre Harari
- Ludwig Center for Cancer Research - University of Lausanne (UNIL), CH-1066, Switzerland
| | - George Coukos
- Ludwig Center for Cancer Research - University of Lausanne (UNIL), CH-1066, Switzerland
| | - Carlotta Guiducci
- Laboratory of Life Sciences Electronics - Swiss Federal Institute of Technology (EPFL), Lausanne CH-1015, Switzerland.
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Wang L, Yi W, Ye J, Qin H, Long Y, Yang M, Li Q. Interactions among triphenyltin degradation, phospholipid synthesis and membrane characteristics of Bacillus thuringiensis in the presence of d-malic acid. CHEMOSPHERE 2017; 169:403-412. [PMID: 27886543 DOI: 10.1016/j.chemosphere.2016.10.140] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Revised: 10/26/2016] [Accepted: 10/31/2016] [Indexed: 06/06/2023]
Abstract
Degradation pathway and surface biosorption of triphenyltin (TPT) by effective microbes have been investigated in the past. However, unclear interactions among membrane components and TPT binding and transport are still obstacles to understanding TPT biotransformation. To reveal the mechanism involved, the phospholipid expression, membrane potential, cellular mechanism and molecular dynamics between TPT and fatty acids (FAs) during the TPT degradation process in the presence of d-malic acid (DMA) were studied. The results show that the degradation efficiency of 1 mg L-1 TPT by Bacillus thuringiensis (1 g L-1) with 0.5 or 1 mg L-1 DMA reached values up to approximately 90% due to the promotion of element metabolism and cellular activity, and the depression of FA synthesis induced by DMA. The addition of DMA caused conversion of more linoleic acid into 10-oxo-12(Z)-octadecenoic acid, increased the membrane permeability, and alleviated the decrease in membrane potential, resulting in TPT transport and degradation. Fluorescence analysis reveals that the endospore of B. thuringiensis could act as an indicator for membrane potential and cellular activities. The current findings are advantageous for acceleration of biosorption, transport and removal of pollutants from natural environments.
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Affiliation(s)
- Linlin Wang
- Key Laboratory of Environmental Exposure and Health of Guangzhou City, School of Environment, Jinan University, Guangzhou, 510632, Guangdong, China; Joint Genome Institute, Lawrence Berkeley National Laboratory, Walnut Creek, 94598, CA, USA
| | - Wenying Yi
- Key Laboratory of Environmental Exposure and Health of Guangzhou City, School of Environment, Jinan University, Guangzhou, 510632, Guangdong, China
| | - Jinshao Ye
- Key Laboratory of Environmental Exposure and Health of Guangzhou City, School of Environment, Jinan University, Guangzhou, 510632, Guangdong, China; Joint Genome Institute, Lawrence Berkeley National Laboratory, Walnut Creek, 94598, CA, USA.
| | - Huaming Qin
- Key Laboratory of Environmental Exposure and Health of Guangzhou City, School of Environment, Jinan University, Guangzhou, 510632, Guangdong, China
| | - Yan Long
- Key Laboratory of Environmental Exposure and Health of Guangzhou City, School of Environment, Jinan University, Guangzhou, 510632, Guangdong, China
| | - Meng Yang
- Key Laboratory of Environmental Exposure and Health of Guangzhou City, School of Environment, Jinan University, Guangzhou, 510632, Guangdong, China
| | - Qusheng Li
- Key Laboratory of Environmental Exposure and Health of Guangzhou City, School of Environment, Jinan University, Guangzhou, 510632, Guangdong, China
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Shuona C, Hua Y, Jingjing C, Hui P, Zhi D. Physiology and bioprocess of single cell of Stenotrophomonas maltophilia in bioremediation of co-existed benzo[a]pyrene and copper. JOURNAL OF HAZARDOUS MATERIALS 2017; 321:9-17. [PMID: 27607928 DOI: 10.1016/j.jhazmat.2016.09.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 08/19/2016] [Accepted: 09/01/2016] [Indexed: 06/06/2023]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) and heavy metals are generally present in mixtures in the e-waste dismantling areas, posing serious health risk to the local people. Bioremediation has been considered as a promising approach for PAHs and heavy metals removal. In this study, we applied flow cytometry to obtain a better understanding of membrane potential (MP), apoptosis and cell cycle of Stenotrophomonas maltophilia affected by combined pollutants of benzo[a]pyrene(BaP) and Cu(II). The results showed that BaP was the main factor damaging the cell membrane and influencing the MP. S. maltophilia could even protect against upsetting situation by encouraging early apoptosis, whereby compromised cells committed suicide, as a result, which, in turn, facilitated the metabolism of the bacteria with high-vitality. Furthermore, even if the bacterial cell division was blocked and stopped reproduction, a large number of key enzymes inside cells could still be used for degradation of BaP. The expression of protein related to the transport and metabolism of BaP, regulation of redox reactions and phosphorylation in bacterial cell during bioprocess were evident different.
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Affiliation(s)
- Chen Shuona
- College of Natural Resources and Environment of South China Agricultural University, Guangzhou 510642, China
| | - Yin Hua
- Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
| | - Chang Jingjing
- College of Natural Resources and Environment of South China Agricultural University, Guangzhou 510642, China
| | - Peng Hui
- Department of Chemistry, School of Life Science and Technology, Jinan University, Guangzhou 510632, China
| | - Dang Zhi
- Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education; School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
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34
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Heidmann I, Schade-Kampmann G, Lambalk J, Ottiger M, Di Berardino M. Impedance Flow Cytometry: A Novel Technique in Pollen Analysis. PLoS One 2016; 11:e0165531. [PMID: 27832091 PMCID: PMC5104384 DOI: 10.1371/journal.pone.0165531] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Accepted: 10/13/2016] [Indexed: 11/29/2022] Open
Abstract
INTRODUCTION An efficient and reliable method to estimate plant cell viability, especially of pollen, is important for plant breeding research and plant production processes. Pollen quality is determined by classical methods, like staining techniques or in vitro pollen germination, each having disadvantages with respect to reliability, analysis speed, and species dependency. Analysing single cells based on their dielectric properties by impedance flow cytometry (IFC) has developed into a common method for cellular characterisation in microbiology and medicine during the last decade. The aim of this study is to demonstrate the potential of IFC in plant cell analysis with the focus on pollen. METHOD Developing and mature pollen grains were analysed during their passage through a microfluidic chip to which radio frequencies of 0.5 to 12 MHz were applied. The acquired data provided information about the developmental stage, viability, and germination capacity. The biological relevance of the acquired IFC data was confirmed by classical staining methods, inactivation controls, as well as pollen germination assays. RESULTS Different stages of developing pollen, dead, viable and germinating pollen populations could be detected and quantified by IFC. Pollen viability analysis by classical FDA staining showed a high correlation with IFC data. In parallel, pollen with active germination potential could be discriminated from the dead and the viable but non-germinating population. CONCLUSION The presented data demonstrate that IFC is an efficient, label-free, reliable and non-destructive technique to analyse pollen quality in a species-independent manner.
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Affiliation(s)
- Iris Heidmann
- Enza Zaden, Research and Development B.V. P.O. Box 7, 1600AA Enkhuizen, The Netherlands
| | | | - Joep Lambalk
- Enza Zaden, Research and Development B.V. P.O. Box 7, 1600AA Enkhuizen, The Netherlands
| | - Marcel Ottiger
- Amphasys AG, Technopark Lucerne, 6039 Root D4, Switzerland
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Kogermann K, Putrinš M, Tenson T. Single-cell level methods for studying the effect of antibiotics on bacteria during infection. Eur J Pharm Sci 2016; 95:2-16. [PMID: 27577009 DOI: 10.1016/j.ejps.2016.08.042] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 08/17/2016] [Accepted: 08/23/2016] [Indexed: 12/11/2022]
Abstract
Considerable evidence about phenotypic heterogeneity among bacteria during infection has accumulated during recent years. This heterogeneity has to be considered if the mechanisms of infection and antibiotic action are to be understood, so we need to implement existing and find novel methods to monitor the effects of antibiotics on bacteria at the single-cell level. This review provides an overview of methods by which this aim can be achieved. Fluorescence label-based methods and Raman scattering as a label-free approach are discussed in particular detail. Other label-free methods that can provide single-cell level information, such as impedance spectroscopy and surface plasmon resonance, are briefly summarized. The advantages and disadvantages of these different methods are discussed in light of a challenging in vivo environment.
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Affiliation(s)
- Karin Kogermann
- Institute of Pharmacy, University of Tartu, Nooruse 1, 50411 Tartu, Estonia.
| | - Marta Putrinš
- Institute of Technology, University of Tartu, Nooruse 1, 50411 Tartu, Estonia.
| | - Tanel Tenson
- Institute of Technology, University of Tartu, Nooruse 1, 50411 Tartu, Estonia.
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de Wagenaar B, Dekker S, de Boer HL, Bomer JG, Olthuis W, van den Berg A, Segerink LI. Towards microfluidic sperm refinement: impedance-based analysis and sorting of sperm cells. LAB ON A CHIP 2016; 16:1514-1522. [PMID: 27025866 DOI: 10.1039/c6lc00256k] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The use of high quality semen for artificial insemination in the livestock industry is essential for successful outcome. Insemination using semen with a high number of sperm cells containing morphological defects has a negative impact on fertilization outcome. Therefore, semen with a high number of these abnormal cells is discarded in order to maintain high fertilization potential, resulting in the loss of a large number of morphologically normal sperm cells (up to 70-80% of original sample). A commonly occurring morphological sperm anomaly is the cytoplasmic droplet on the sperm flagella. Currently, no techniques are available to extract morphologically normal sperm cells from rejected samples. Therefore, we aim to develop a microfluidic setup which is able to detect and sort morphologically normal sperm cells label-free and non-invasively. In a proof-of-concept experiment, differential impedance measurements were used to detect the presence of cytoplasmic droplets on sperm flagella, which was quantified by calculating the area under the curve (AUC) of the corresponding impedance peaks. A receiver operating characteristic curve of this electrical analysis method showed the good predictive power of this analysis method (AUC value of 0.85). Furthermore, we developed a label-free cell sorting system using LabVIEW, which is capable of sorting sperm cells based on impedance. In a proof-of-concept experiment, sperm cells and 3 μm beads were sorted label-free and non-invasively using impedance detection and dielectrophoresis sorting. These experiments present our first attempt to perform sperm refinement using microfluidic technology.
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Affiliation(s)
- B de Wagenaar
- BIOS Lab on a Chip Group, MESA+ and MIRA Institutes, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. ,
| | - S Dekker
- BIOS Lab on a Chip Group, MESA+ and MIRA Institutes, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. ,
| | - H L de Boer
- BIOS Lab on a Chip Group, MESA+ and MIRA Institutes, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. ,
| | - J G Bomer
- BIOS Lab on a Chip Group, MESA+ and MIRA Institutes, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. ,
| | - W Olthuis
- BIOS Lab on a Chip Group, MESA+ and MIRA Institutes, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. ,
| | - A van den Berg
- BIOS Lab on a Chip Group, MESA+ and MIRA Institutes, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. ,
| | - L I Segerink
- BIOS Lab on a Chip Group, MESA+ and MIRA Institutes, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. , and Department of Obstetrics and Gynaecology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
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Schoendube J, Wright D, Zengerle R, Koltay P. Single-cell printing based on impedance detection. BIOMICROFLUIDICS 2015; 9:014117. [PMID: 25759750 PMCID: PMC4327922 DOI: 10.1063/1.4907896] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2014] [Accepted: 01/29/2015] [Indexed: 05/07/2023]
Abstract
Label-free isolation of single cells is essential for the growing field of single-cell analysis. Here, we present a device which prints single living cells encapsulated in free-flying picoliter droplets. It combines inkjet printing and impedance flow cytometry. Droplet volume can be controlled in the range of 500 pl-800 pl by piezo actuator displacement. Two sets of parallel facing electrodes in a 50 μm × 55 μm channel are applied to measure the presence and velocity of a single cell in real-time. Polystyrene beads with <5% variation in diameter generated signal variations of 12%-17% coefficients of variation. Single bead efficiency (i.e., printing events with single beads vs. total number of printing events) was 73% ± 11% at a throughput of approximately 9 events/min. Viability of printed HeLa cells and human primary fibroblasts was demonstrated by culturing cells for at least eight days.
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Affiliation(s)
| | - D Wright
- Zurich Instruments AG , Technoparkstrasse 1, 8005 Zurich, Switzerland
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Coplanar Electrode Layout Optimized for Increased Sensitivity for Electrical Impedance Spectroscopy. MICROMACHINES 2014. [DOI: 10.3390/mi6010110] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Morgan H, Spencer D. Microfluidic Impedance Cytometry for Blood Cell Analysis. MICROFLUIDICS FOR MEDICAL APPLICATIONS 2014. [DOI: 10.1039/9781849737593-00213] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Microfluidic Impedance Cytometry (MIC) is a label-free technique for counting and analyzing single cells at high throughput. Over the last decade the technology has matured into a robust and versatile tool with applications in many areas. Multi-frequency impedance measurements provide information on cell dielectric properties, including cell volume, membrane capacitance, and internal (cytoplasmic) electrical properties. This chapter describes the basic principles underlying MIC together with the technology that enables such measurements. Examples of application in healthcare and diagnostics are provided, including the use of MIC for performing a fast and simple full blood count with a very small volume of sample. The limits of sensitivity of the system are discussed along with novel approaches to enable measurement of small particles such as bacteria. MIC has been used to probe the properties of parasite infected cells, to distinguish tumor cells from normal cells, and even in the differentiation state of stem cells. Addressing future technology challenges, particularly in integrated sample processing, should enable MIC to be used as part of a simple diagnostic toolkit providing sample in, answer out solutions.
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Affiliation(s)
- Hywel Morgan
- Faculty of Physical and Applied Sciences, and Institute for Life Sciences, University of Southampton UK
| | - Daniel Spencer
- Faculty of Physical and Applied Sciences, and Institute for Life Sciences, University of Southampton UK
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40
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Esteban-Ferrer D, Edwards MA, Fumagalli L, Juárez A, Gomila G. Electric polarization properties of single bacteria measured with electrostatic force microscopy. ACS NANO 2014; 8:9843-9. [PMID: 25184827 DOI: 10.1021/nn5041476] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
We quantified the electrical polarization properties of single bacterial cells using electrostatic force microscopy. We found that the effective dielectric constant, ε(r,eff), for the four bacterial types investigated (Salmonella typhimurium, Escherchia coli, Lactobacilus sakei, and Listeria innocua) is around 3-5 under dry air conditions. Under ambient humidity, it increases to ε(r,eff) ∼ 6-7 for the Gram-negative bacterial types (S. typhimurium and E. coli) and to ε(r,eff) ∼ 15-20 for the Gram-positive ones (L. sakei and L. innocua). We show that the measured effective dielectric constants can be consistently interpreted in terms of the electric polarization properties of the biochemical components of the bacterial cell compartments and of their hydration state. These results demonstrate the potential of electrical studies of single bacterial cells.
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Affiliation(s)
- Daniel Esteban-Ferrer
- Institut de Bioenginyeria de Catalunya (IBEC) , C/Baldiri i Reixac 11-15, 08028 Barcelona, Spain
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Crocetti S, Beyer C, Unternährer S, Benavides Damm T, Schade-Kampmann G, Hebeisen M, Di Berardino M, Fröhlich J, Franco-Obregón A. Impedance flow cytometry gauges proliferative capacity by detecting TRPC1 expression. Cytometry A 2014; 85:525-36. [DOI: 10.1002/cyto.a.22461] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Revised: 12/10/2013] [Accepted: 03/03/2014] [Indexed: 01/13/2023]
Affiliation(s)
| | - Christian Beyer
- Electromagnetics in Medicine and Biology Group, Laboratory for Electromagnetic Fields and Microwave Electronics; ETH Zürich Switzerland
| | | | - Tatiana Benavides Damm
- Institute for Biomechanics; ETH Zürich Switzerland
- CC Aerospace Biomedical Science & Technology, Space Biology Group, Luzern University of Applied Sciences and Arts; Hergiswil Switzerland
| | | | - Monika Hebeisen
- Leister Process Technologies; Axetris Division; Kaegiswil Switzerland
| | | | - Jürg Fröhlich
- Electromagnetics in Medicine and Biology Group, Laboratory for Electromagnetic Fields and Microwave Electronics; ETH Zürich Switzerland
| | - Alfredo Franco-Obregón
- Institute for Biomechanics; ETH Zürich Switzerland
- Department of Surgery; Yong Loo Lin School of Medicine, National University of Singapore; Singapore
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Crocetti S, Beyer C, Schade G, Egli M, Fröhlich J, Franco-Obregón A. Low intensity and frequency pulsed electromagnetic fields selectively impair breast cancer cell viability. PLoS One 2013; 8:e72944. [PMID: 24039828 PMCID: PMC3770670 DOI: 10.1371/journal.pone.0072944] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Accepted: 07/22/2013] [Indexed: 01/03/2023] Open
Abstract
INTRODUCTION A common drawback of many anticancer therapies is non-specificity in action of killing. We investigated the potential of ultra-low intensity and frequency pulsed electromagnetic fields (PEMFs) to kill breast cancer cells. Our criteria to accept this technology as a potentially valid therapeutic approach were: 1) cytotoxicity to breast cancer cells and; 2) that the designed fields proved innocuous to healthy cell classes that would be exposed to the PEMFs during clinical treatment. METHODS MCF7 breast cancer cells and their normal counterparts, MCF10 cells, were exposed to PEMFs and cytotoxic indices measured in order to design PEMF paradigms that best kill breast cancer cells. The PEMF parameters tested were: 1) frequencies ranging from 20 to 50 Hz; 2) intensities ranging from 2 mT to 5 mT and; 3) exposure durations ranging from 30 to 90 minutes per day for up to three days to determine the optimum parameters for selective cancer cell killing. RESULTS We observed a discrete window of vulnerability of MCF7 cells to PEMFs of 20 Hz frequency, 3 mT magnitude and exposure duration of 60 minutes per day. The cell damage accrued in response to PEMFs increased with time and gained significance after three days of consecutive daily exposure. By contrast, the PEMFs parameters determined to be most cytotoxic to breast cancer MCF-7 cells were not damaging to normal MCF-10 cells. CONCLUSION Based on our data it appears that PEMF-based anticancer strategies may represent a new therapeutic approach to treat breast cancer without affecting normal tissues in a manner that is non-invasive and can be potentially combined with existing anti-cancer treatments.
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Affiliation(s)
- Sara Crocetti
- Department of Environmental Science, University of Siena, Siena, Italy
- Institute of Biomechanics, Swiss Federal Institute of Technology (ETH), Zurich, Switzerland
| | - Christian Beyer
- Electromagnetic Fields and Microwave Electronics Laboratory, Swiss Federal Institute of Technology (ETH), Zurich, Switzerland
| | - Grit Schade
- Amphasys AG, Technopark Luzern, Root D4, Switzerland
| | - Marcel Egli
- The Center of Competence in Aerospace Biomedical Science and Technology, Lucerne University of Applied Sciences and Arts, Hergiswil, Switzerland
| | - Jürg Fröhlich
- Electromagnetic Fields and Microwave Electronics Laboratory, Swiss Federal Institute of Technology (ETH), Zurich, Switzerland
| | - Alfredo Franco-Obregón
- Institute of Biomechanics, Swiss Federal Institute of Technology (ETH), Zurich, Switzerland
- Department of Surgery, National University Hospital, Singapore, Singapore
- * E-mail:
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Impact of ciprofloxacin and chloramphenicol on the lipid bilayer of Staphylococcus aureus: changes in membrane potential. BIOMED RESEARCH INTERNATIONAL 2013; 2013:276524. [PMID: 23762834 PMCID: PMC3676981 DOI: 10.1155/2013/276524] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2013] [Revised: 04/16/2013] [Accepted: 05/07/2013] [Indexed: 11/18/2022]
Abstract
The present study was undertaken to explore the interaction of ciprofloxacin and chloramphenicol with bacterial membranes in a sensitive and in a resistant strains of Staphylococcus aureus by using 1-anilino-8-naphthalene sulfonate (ANS). The binding of this probe to the cell membrane depends on the surface potential, which modulates the binding constant to the membrane. We observed that these antibiotics interacted with the bilayer, thus affecting the electrostatic surface potential. Alterations caused by antibiotics on the surface of the bacteria were accompanied by a reduction in the number of binding sites and an increase in the ANS dissociation constant in the sensitive strain, whereas in the ciprofloxacin-resistant strain no significant changes were detected. The changes seen in the electrostatic surface potential generated in the membrane of S. aureus by the antibiotics provide new aspects concerning their action on the bacterial cell.
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Bergmann S, David F, Franco-Lara E, Wittmann C, Krull R. Ectoine production byAlkalibacillus haloalkaliphilus-Bioprocess development using response surface methodology and model-driven strategies. Eng Life Sci 2013. [DOI: 10.1002/elsc.201200151] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Affiliation(s)
- Sven Bergmann
- Institute of Biochemical Engineering; Technische Universität Braunschweig; Braunschweig Germany
| | - Florian David
- Institute of Biochemical Engineering; Technische Universität Braunschweig; Braunschweig Germany
| | - Ezequiel Franco-Lara
- Institute of Biochemical Engineering; Technische Universität Braunschweig; Braunschweig Germany
| | - Christoph Wittmann
- Institute of Biochemical Engineering; Technische Universität Braunschweig; Braunschweig Germany
| | - Rainer Krull
- Institute of Biochemical Engineering; Technische Universität Braunschweig; Braunschweig Germany
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Pierzchalski A, Hebeisen M, Mittag A, Bocsi J, Di Berardino M, Tarnok A. Label-free hybridoma cell culture quality control by a chip-based impedance flow cytometer. LAB ON A CHIP 2012; 12:4533-4543. [PMID: 22907524 DOI: 10.1039/c2lc40408g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Impedance flow cytometry (IFC) was evaluated as a possible alternative to fluorescence-based methods for on-line quality monitoring of hybridoma cells. Hybridoma cells were cultured at different cell densities and viability was estimated by means of IFC and fluorescence-based flow cytometry (FCM). Cell death was determined by measuring the impedance phase value at high frequency in low conductivity buffer. IFC data correlate well with reference FCM measurements using AnnexinV and 7-AAD staining. Hybridoma cells growing at different densities in cell culture revealed a density-dependent subpopulation pattern. Living cells of high density cultures show reduced impedance amplitudes, indicating particular cellular changes. Dead cell subpopulations become evident in cultures with increasing cell densities. In addition, a novel intermediate subpopulation, which most probably represents apoptotic cells, was identified. These results emphasize the extraordinary sensitivity of high frequency impedance measurements and their suitability for hybridoma cell culture quality control.
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Korneli C, David F, Biedendieck R, Jahn D, Wittmann C. Getting the big beast to work--systems biotechnology of Bacillus megaterium for novel high-value proteins. J Biotechnol 2012; 163:87-96. [PMID: 22750448 DOI: 10.1016/j.jbiotec.2012.06.018] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Revised: 06/18/2012] [Accepted: 06/20/2012] [Indexed: 12/31/2022]
Abstract
The high industrial relevance of the soil bacterium Bacillus megaterium as host for recombinant proteins is driving systems-wide analyses of its metabolic and regulatory networks. The present review highlights novel systems biology tools available to unravel the various cellular components on the level of metabolic and regulatory networks. These provide a rational platform for systems metabolic engineering of B. megaterium. In line, a number of interesting studies have particularly focused on studying recombinant B. megaterium in its industrial bioprocess environment thus integrating systems metabolic engineering with systems biotechnology and providing the full picture toward optimal processes.
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Affiliation(s)
- Claudia Korneli
- Institute of Biochemical Engineering, Technische Universität Braunschweig, Braunschweig, Germany
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