1
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Pradeep S, Zangle TA. LVING reveals the intracellular structure of cell growth. Sci Rep 2024; 14:8544. [PMID: 38609444 PMCID: PMC11014851 DOI: 10.1038/s41598-024-58992-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2023] [Accepted: 04/05/2024] [Indexed: 04/14/2024] Open
Abstract
The continuous balance of growth and degradation inside cells maintains homeostasis. Disturbance of this balance by internal or external factors cause state of disease, while effective disease treatments seek to restore this balance. Here, we present a method based on quantitative phase imaging (QPI) based measurements of cell mass and the velocity of mass transport to quantify the balance of growth and degradation within intracellular control volumes. The result, which we call Lagrangian velocimetry for intracellular net growth (LVING), provides high resolution maps of intracellular biomass production and degradation. We use LVING to quantify the growth in different regions of the cell during phases of the cell cycle. LVING can also be used to quantitatively compare the effect of range of chemotherapy drug doses on subcellular growth processes. Finally, we applied LVING to characterize the effect of autophagy on the growth machinery inside cells. Overall, LVING reveals both the structure and distribution of basal growth within cells, as well as the disruptions to this structure that occur during alterations in cell state.
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Affiliation(s)
- Soorya Pradeep
- Department of Chemical Engineering, University of Utah, Salt Lake City, Utah, USA
| | - Thomas A Zangle
- Department of Chemical Engineering, University of Utah, Salt Lake City, Utah, USA.
- Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah, USA.
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2
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Mitchell SJ, Pardo-Pastor C, Zangle TA, Rosenblatt J. Voltage-dependent volume regulation controls epithelial cell extrusion and morphology. bioRxiv 2023:2023.03.13.532421. [PMID: 36993671 PMCID: PMC10054995 DOI: 10.1101/2023.03.13.532421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Epithelial cells work collectively to provide a protective barrier, yet also turn over rapidly by cell death and division. If the number of dying cells does not match those dividing, the barrier would vanish, or tumors can form. Mechanical forces and the stretch-activated ion channel (SAC) Piezo1 link both processes; stretch promotes cell division and crowding triggers cell death by initiating live cell extrusion1,2. However, it was not clear how particular cells within a crowded region are selected for extrusion. Here, we show that individual cells transiently shrink via water loss before they extrude. Artificially inducing cell shrinkage by increasing extracellular osmolarity is sufficient to induce cell extrusion. Pre-extrusion cell shrinkage requires the voltage-gated potassium channels Kv1.1 and Kv1.2 and the chloride channel SWELL1, upstream of Piezo1. Activation of these voltage-gated channels requires the mechano-sensitive Epithelial Sodium Channel, ENaC, acting as the earliest crowd-sensing step. Imaging with a voltage dye indicated that epithelial cells lose membrane potential as they become crowded and smaller, yet those selected for extrusion are markedly more depolarized than their neighbours. Loss of any of these channels in crowded conditions causes epithelial buckling, highlighting an important role for voltage and water regulation in controlling epithelial shape as well as extrusion. Thus, ENaC causes cells with similar membrane potentials to slowly shrink with compression but those with reduced membrane potentials to be eliminated by extrusion, suggesting a chief driver of cell death stems from insufficient energy to maintain cell membrane potential.
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Affiliation(s)
- Saranne J Mitchell
- Department of Biomedical Engineering, University of Utah, Salt Lake City, Utah, USA
- The Randall Centre for Cell & Molecular Biophysics, School of Basic & Medical Biosciences, & School of Cancer and Pharmaceutical Sciences, King's College London, London, UK
| | - Carlos Pardo-Pastor
- The Randall Centre for Cell & Molecular Biophysics, School of Basic & Medical Biosciences, & School of Cancer and Pharmaceutical Sciences, King's College London, London, UK
| | - Thomas A Zangle
- Department of Chemical Engineering, University of Utah, Salt Lake City, Utah, USA
| | - Jody Rosenblatt
- The Randall Centre for Cell & Molecular Biophysics, School of Basic & Medical Biosciences, & School of Cancer and Pharmaceutical Sciences, King's College London, London, UK
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3
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Kidwell CU, Casalini JR, Pradeep S, Scherer SD, Greiner D, Bayik D, Watson DC, Olson GS, Lathia JD, Johnson JS, Rutter J, Welm AL, Zangle TA, Roh-Johnson M. Transferred mitochondria accumulate reactive oxygen species, promoting proliferation. eLife 2023; 12:e85494. [PMID: 36876914 PMCID: PMC10042539 DOI: 10.7554/elife.85494] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Accepted: 03/01/2023] [Indexed: 03/07/2023] Open
Abstract
Recent studies reveal that lateral mitochondrial transfer, the movement of mitochondria from one cell to another, can affect cellular and tissue homeostasis. Most of what we know about mitochondrial transfer stems from bulk cell studies and have led to the paradigm that functional transferred mitochondria restore bioenergetics and revitalize cellular functions to recipient cells with damaged or non-functional mitochondrial networks. However, we show that mitochondrial transfer also occurs between cells with functioning endogenous mitochondrial networks, but the mechanisms underlying how transferred mitochondria can promote such sustained behavioral reprogramming remain unclear. We report that unexpectedly, transferred macrophage mitochondria are dysfunctional and accumulate reactive oxygen species in recipient cancer cells. We further discovered that reactive oxygen species accumulation activates ERK signaling, promoting cancer cell proliferation. Pro-tumorigenic macrophages exhibit fragmented mitochondrial networks, leading to higher rates of mitochondrial transfer to cancer cells. Finally, we observe that macrophage mitochondrial transfer promotes tumor cell proliferation in vivo. Collectively these results indicate that transferred macrophage mitochondria activate downstream signaling pathways in a ROS-dependent manner in cancer cells, and provide a model of how sustained behavioral reprogramming can be mediated by a relatively small amount of transferred mitochondria in vitro and in vivo.
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Affiliation(s)
- Chelsea U Kidwell
- Department of Biochemistry, University of Utah School of MedicineSalt Lake CityUnited States
| | - Joseph R Casalini
- Department of Biochemistry, University of Utah School of MedicineSalt Lake CityUnited States
| | - Soorya Pradeep
- Department of Chemical Engineering, University of UtahSalt Lake CityUnited States
| | - Sandra D Scherer
- Department of Oncological Sciences, Huntsman Cancer Institute, University of UtahSalt Lake CityUnited States
| | - Daniel Greiner
- Department of Biochemistry, University of Utah School of MedicineSalt Lake CityUnited States
| | - Defne Bayik
- Department of Cardiovascular and Metabolic Sciences, Lerner Research Institute, Cleveland Clinic, Case Western Reserve UniversityClevelandUnited States
| | - Dionysios C Watson
- Department of Cardiovascular and Metabolic Sciences, Lerner Research Institute, Cleveland Clinic, Case Western Reserve UniversityClevelandUnited States
- University Hospitals Cleveland Medical CenterClevelandUnited States
- School of Medicine, Case Western Reserve UniversityClevelandUnited States
| | - Gregory S Olson
- Medical Scientist Training Program, University of WashingtonSeattleUnited States
| | - Justin D Lathia
- Department of Cardiovascular and Metabolic Sciences, Lerner Research Institute, Cleveland Clinic, Case Western Reserve UniversityClevelandUnited States
| | - Jarrod S Johnson
- Division of Microbiology & Immunology, Department of Pathology, University of Utah School of MedicineSalt Lake CityUnited States
| | - Jared Rutter
- Department of Biochemistry, University of Utah School of MedicineSalt Lake CityUnited States
- Howard Hughes Medical Institute, University of Utah School of MedicineSalt Lake CityUnited States
- Huntsman Cancer Institute, University of UtahSalt Lake CityUnited States
| | - Alana L Welm
- Department of Oncological Sciences, Huntsman Cancer Institute, University of UtahSalt Lake CityUnited States
| | - Thomas A Zangle
- Department of Chemical Engineering, University of UtahSalt Lake CityUnited States
- Huntsman Cancer Institute, University of UtahSalt Lake CityUnited States
| | - Minna Roh-Johnson
- Department of Biochemistry, University of Utah School of MedicineSalt Lake CityUnited States
- Huntsman Cancer Institute, University of UtahSalt Lake CityUnited States
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4
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Moustafa TE, Polanco ER, Belote RL, Judson-Torres RL, Zangle TA. Fabrication and validation of an LED array microscope for multimodal, quantitative imaging. HardwareX 2023; 13:e00399. [PMID: 36756350 PMCID: PMC9900438 DOI: 10.1016/j.ohx.2023.e00399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 01/11/2023] [Accepted: 01/21/2023] [Indexed: 06/18/2023]
Abstract
The combination of multiple imaging modalities in a single microscopy system can enable new insights into biological processes. In this work, we describe the construction and rigorous characterization of a custom microscope with multimodal imaging in a single, cost-effective system. Our design utilizes advances in LED technology, robotics, and open-source software, along with existing optical components and precision optomechanical parts to offer a modular and versatile design. This microscope is operated using software written in Arduino and Python and has the ability to run multi-day automated imaging experiments when placed inside of a cell culture incubator. Additionally, we provide and demonstrate methods to validate images taken in brightfield and darkfield, along with validation and optimization for differential phase contrast (DPC) quantitative phase imaging.
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Affiliation(s)
- Tarek E. Moustafa
- Department of Chemical Engineering, University of Utah, Salt Lake City, UT, USA
| | - Edward R. Polanco
- Department of Chemical Engineering, University of Utah, Salt Lake City, UT, USA
| | - Rachel L. Belote
- Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA
| | - Robert L. Judson-Torres
- Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA
- Department of Dermatology, University of Utah, Salt Lake City, UT, USA
| | - Thomas A. Zangle
- Department of Chemical Engineering, University of Utah, Salt Lake City, UT, USA
- Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA
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5
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Nguyen TL, Pradeep S, Judson-Torres RL, Reed J, Teitell MA, Zangle TA. Quantitative Phase Imaging: Recent Advances and Expanding Potential in Biomedicine. ACS Nano 2022; 16:11516-11544. [PMID: 35916417 PMCID: PMC10112851 DOI: 10.1021/acsnano.1c11507] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Quantitative phase imaging (QPI) is a label-free, wide-field microscopy approach with significant opportunities for biomedical applications. QPI uses the natural phase shift of light as it passes through a transparent object, such as a mammalian cell, to quantify biomass distribution and spatial and temporal changes in biomass. Reported in cell studies more than 60 years ago, ongoing advances in QPI hardware and software are leading to numerous applications in biology, with a dramatic expansion in utility over the past two decades. Today, investigations of cell size, morphology, behavior, cellular viscoelasticity, drug efficacy, biomass accumulation and turnover, and transport mechanics are supporting studies of development, physiology, neural activity, cancer, and additional physiological processes and diseases. Here, we review the field of QPI in biology starting with underlying principles, followed by a discussion of technical approaches currently available or being developed, and end with an examination of the breadth of applications in use or under development. We comment on strengths and shortcomings for the deployment of QPI in key biomedical contexts and conclude with emerging challenges and opportunities based on combining QPI with other methodologies that expand the scope and utility of QPI even further.
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6
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Polanco ER, Moustafa TE, Butterfield A, Scherer SD, Cortes-Sanchez E, Bodily T, Spike BT, Welm BE, Bernard PS, Zangle TA. Multiparametric quantitative phase imaging for real-time, single cell, drug screening in breast cancer. Commun Biol 2022; 5:794. [PMID: 35941353 PMCID: PMC9360018 DOI: 10.1038/s42003-022-03759-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 07/22/2022] [Indexed: 11/09/2022] Open
Abstract
Quantitative phase imaging (QPI) measures the growth rate of individual cells by quantifying changes in mass versus time. Here, we use the breast cancer cell lines MCF-7, BT-474, and MDA-MB-231 to validate QPI as a multiparametric approach for determining response to single-agent therapies. Our method allows for rapid determination of drug sensitivity, cytotoxicity, heterogeneity, and time of response for up to 100,000 individual cells or small clusters in a single experiment. We find that QPI EC50 values are concordant with CellTiter-Glo (CTG), a gold standard metabolic endpoint assay. In addition, we apply multiparametric QPI to characterize cytostatic/cytotoxic and rapid/slow responses and track the emergence of resistant subpopulations. Thus, QPI reveals dynamic changes in response heterogeneity in addition to average population responses, a key advantage over endpoint viability or metabolic assays. Overall, multiparametric QPI reveals a rich picture of cell growth by capturing the dynamics of single-cell responses to candidate therapies.
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Affiliation(s)
- Edward R Polanco
- Department of Chemical Engineering, University of Utah, Salt Lake City, UT, USA
| | - Tarek E Moustafa
- Department of Chemical Engineering, University of Utah, Salt Lake City, UT, USA
| | - Andrew Butterfield
- Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA.,Department of Oncological Sciences, University of Utah, Salt Lake City, UT, USA
| | - Sandra D Scherer
- Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA.,Department of Oncological Sciences, University of Utah, Salt Lake City, UT, USA
| | - Emilio Cortes-Sanchez
- Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA.,Department of Oncological Sciences, University of Utah, Salt Lake City, UT, USA
| | - Tyler Bodily
- Department of Chemical Engineering, University of Utah, Salt Lake City, UT, USA
| | - Benjamin T Spike
- Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA.,Department of Oncological Sciences, University of Utah, Salt Lake City, UT, USA
| | - Bryan E Welm
- Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA.,Department of Surgery, University of Utah, Salt Lake City, UT, USA
| | - Philip S Bernard
- Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA.,Department of Pathology, University of Utah, Salt Lake City, UT, USA.,ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, UT, USA
| | - Thomas A Zangle
- Department of Chemical Engineering, University of Utah, Salt Lake City, UT, USA. .,Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA.
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7
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Pradeep S, Zangle TA. Quantitative phase velocimetry measures bulk intracellular transport of cell mass during the cell cycle. Sci Rep 2022; 12:6074. [PMID: 35414087 PMCID: PMC9005622 DOI: 10.1038/s41598-022-10000-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Accepted: 03/22/2022] [Indexed: 12/13/2022] Open
Abstract
Transport of mass within cells helps maintain homeostasis and is disrupted by disease and stress. Here, we develop quantitative phase velocimetry (QPV) as a label-free approach to make the invisible flow of mass within cells visible and quantifiable. We benchmark our approach against alternative image registration methods, a theoretical error model, and synthetic data. Our method tracks not just individual labeled particles or molecules, but the entire flow of bulk material through the cell. This enables us to measure diffusivity within distinct cell compartments using a single approach, which we use here for direct comparison of nuclear and cytoplasmic diffusivity. As a label-free method, QPV can be used for long-term tracking to capture dynamics through the cell cycle.
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Affiliation(s)
- Soorya Pradeep
- Department of Chemical Engineering, University of Utah, Salt Lake City, UT, 84112, USA
| | - Thomas A Zangle
- Department of Chemical Engineering, University of Utah, Salt Lake City, UT, 84112, USA. .,Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, 84112, USA.
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8
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Moustafa TE, Polanco ER, Butterfield A, Scherer SD, Welm BE, Bernard PS, Zangle TA. Abstract 1301: Real-time single-cell drug response assay in metastatic breast cancer cell lines using quantitative phase imaging. Cancer Res 2021. [DOI: 10.1158/1538-7445.am2021-1301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Introduction: The ability for oncologists to predict a cancer's response to therapy is limited to a few biomarkers used for histologic diagnosis and targeted therapy. Often, in advanced and metastatic disease these biomarkers provide no alternative options for next step systemic treatments. There is a need in oncology for functional assays that can determine a tumor's response to a drug, regardless of its tissue of origin, previous treatments, or mutation status. Quantitative phase imaging (QPI) can measure changes in single cell mass in response to drug treatment in vitro and ex vivo. This platform offers advantages over other functional/metabolic assays in that it monitors changes in real-time and on a single cell basis, revealing heterogeneity in drug response.
Methods: Here, we describe the validation of QPI for the measurement of breast cancer cell response to therapy versus CellTiterGlo (CTG), an endpoint ATP assay. We ran a series of 3-day drug response assays using QPI alongside CTG. We used a 96 well plate with a 6-point dose response between 1.6 nM and 20 μM for multiple cell lines spanning a range of receptor statuses (MCF7, MDA-MB-231, BT-474) with two controls in triplicate. We analyzed single-cell data to measure the heterogeneity of response and assessed how cell-to-cell heterogeneity is affected by dose. Our response data were fitted to a four-parameter Hill equation to compute the IC50 and depth of response.
Results: We found that QPI can determine IC50s for effective treatments as validated by concordance to CTG. As measured by QPI, doxorubicin has a substantial depth of response, indicating cytotoxic effects. Doxorubicin data also show a tighter range of growth rates at high concentration than control, which implies low heterogeneity of response. As expected, ER positive MCF7 cells responded to hydroxy-tamoxifen. This response shows a similar reduction in heterogeneity to doxorubicin but with a reduced depth of response indicating a cytostatic effect. MDA-MB-231 response to palbociclib exhibits a wide range of growth rates, indicating an increase in heterogeneity as measured by QPI. Fluorouracil response shows no significant difference in heterogeneity from control.
Conclusion: In summary, QPI is a useful tool for functional assays that can capture IC50, depth of response, and single-cell heterogeneity of response. In particular, this additional information about single-cell behavior and heterogeneity cannot be measured using a typical endpoint assay. Future work is needed to prove the clinical utility of functional assays from QPI.
Citation Format: Tarek E. Moustafa, Edward R. Polanco, Andrew Butterfield, Sandra D. Scherer, Bryan E. Welm, Philip S. Bernard, Thomas A. Zangle. Real-time single-cell drug response assay in metastatic breast cancer cell lines using quantitative phase imaging [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2021; 2021 Apr 10-15 and May 17-21. Philadelphia (PA): AACR; Cancer Res 2021;81(13_Suppl):Abstract nr 1301.
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9
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Pradeep S, Tasnim T, Zhang H, Zangle TA. Simultaneous measurement of neurite and neural body mass accumulation via quantitative phase imaging. Analyst 2021; 146:1361-1368. [PMID: 33393564 DOI: 10.1039/d0an01961e] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Measurement of neuron behavior is crucial for studying neural development and evaluating the impact of potential therapies on neural regeneration. Conventional approaches to imaging neuronal behavior require labeling and do not separately quantify the growth processes that underlie neural regeneration. In this paper we demonstrate the use of quantitative phase imaging (QPI) as a label-free, quantitative measurement of neuron behavior in vitro. By combining QPI with image processing, our method separately measures the mass accumulation rates of soma and neurites. Additionally, the data provided by QPI can be used to separately measure the processes of maturation and formation of neurites. Overall, our approach has the potential to greatly simplify conventional neurite outgrowth measurements, while providing key data on the resources used to produce neurites during neural development.
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Affiliation(s)
- Soorya Pradeep
- Department of Chemical Engineering, University of Utah, USA
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10
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Pradeep S, Zangle TA. Quantifying Subcellular Growth Dynamics using Quantitative Phase Imaging. Biophys J 2021. [DOI: 10.1016/j.bpj.2020.11.2215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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11
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Huang D, Roy IJ, Murray GF, Reed J, Zangle TA, Teitell MA. Identifying fates of cancer cells exposed to mitotic inhibitors by quantitative phase imaging. Analyst 2020; 145:97-106. [PMID: 31746831 DOI: 10.1039/c9an01346f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Cell cycle deregulation is a cancer hallmark that has stimulated the development of mitotic inhibitors with differing mechanisms of action. Quantitative phase imaging (QPI) is an emerging approach for determining cancer cell sensitivities to chemotherapies in vitro. Cancer cell fates in response to mitotic inhibitors are agent- and dose-dependent. Fates that lead to chromosomal instabilities may result in a survival advantage and drug resistance. Conventional techniques for quantifying cell fates are incompatible with growth inhibition assays that produce binary live/dead results. Therefore, we used QPI to quantify post-mitotic fates of G0/G1 synchronized HeLa cervical adenocarcinoma and M202 melanoma cells during 24 h of escalating-dose exposures to mitotic inhibitors, including microtubule inhibitors paclitaxel and colchicine, and an Aurora kinase A inhibitor, VX-680. QPI determined cell fates by measuring changes in cell biomass, morphology, and mean phase-shift. Cell fates fell into three groups: (1) bipolar division from drug failure; (2) cell death or sustained mitotic arrest; and (3) aberrant endocycling or multipolar division. In this proof-of-concept study, colchicine was most effective in producing desirable outcomes of sustained mitotic arrest or death throughout its dosing range, whereas both paclitaxel and VX-680 yielded dose-dependent multipolar divisions or endocycling, respectively. Furthermore, rapid completion of mitosis associated with bipolar divisions whereas prolonged mitosis associated with multipolar divisions or cell death. Overall, QPI measurement of drug-induced cancer cell fates provides a tool to inform the development of candidate agents by quantifying the dosing ranges over which suboptimal inhibitor choices lead to undesirable, aberrant cancer cell fates.
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Affiliation(s)
- Dian Huang
- Department of Bioengineering, University of California, Los Angeles, CA 90095, USA.
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12
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Nguyen TL, Polanco ER, Patananan AN, Zangle TA, Teitell MA. Cell viscoelasticity is linked to fluctuations in cell biomass distributions. Sci Rep 2020; 10:7403. [PMID: 32366921 PMCID: PMC7198624 DOI: 10.1038/s41598-020-64259-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 04/14/2020] [Indexed: 12/20/2022] Open
Abstract
The viscoelastic properties of mammalian cells can vary with biological state, such as during the epithelial-to-mesenchymal (EMT) transition in cancer, and therefore may serve as a useful physical biomarker. To characterize stiffness, conventional techniques use cell contact or invasive probes and as a result are low throughput, labor intensive, and limited by probe placement. Here, we show that measurements of biomass fluctuations in cells using quantitative phase imaging (QPI) provides a probe-free, contact-free method for quantifying changes in cell viscoelasticity. In particular, QPI measurements reveal a characteristic underdamped response of changes in cell biomass distributions versus time. The effective stiffness and viscosity values extracted from these oscillations in cell biomass distributions correlate with effective cell stiffness and viscosity measured by atomic force microscopy (AFM). This result is consistent for multiple cell lines with varying degrees of cytoskeleton disruption and during the EMT. Overall, our study demonstrates that QPI can reproducibly quantify cell viscoelasticity.
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Affiliation(s)
- Thang L Nguyen
- Department of Bioengineering, University of California at Los Angeles, Los Angeles, CA, 90095, USA
| | - Edward R Polanco
- Department of Chemical Engineering, University of Utah, Salt Lake City, UT, 84112, USA
| | - Alexander N Patananan
- Deparment of Pathology and Laboratory Medicine, University of California at Los Angeles, Los Angeles, CA, 90095, USA
| | - Thomas A Zangle
- Department of Chemical Engineering, University of Utah, Salt Lake City, UT, 84112, USA.
- Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, 84112, USA.
| | - Michael A Teitell
- Department of Bioengineering, University of California at Los Angeles, Los Angeles, CA, 90095, USA.
- Deparment of Pathology and Laboratory Medicine, University of California at Los Angeles, Los Angeles, CA, 90095, USA.
- Molecular Biology Institute, University of California at Los Angeles, Los Angeles, CA, 90095, USA.
- Broad Center for Regenerative Medicine and Stem Cell Research, University of California at Los Angeles, Los Angeles, CA, 90095, USA.
- California NanoSystems Institute, University of California at Los Angeles, Los Angeles, CA, 90095, USA.
- Department of Pediatrics, University of California at Los Angeles, Los Angeles, CA, 90095, USA.
- Jonsson Comprehensive Cancer Center, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, CA, 90095, USA.
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13
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Waters LR, Ahsan FM, Ten Hoeve J, Hong JS, Kim DNH, Minasyan A, Braas D, Graeber TG, Zangle TA, Teitell MA. Ampk regulates IgD expression but not energy stress with B cell activation. Sci Rep 2019; 9:8176. [PMID: 31160601 PMCID: PMC6546716 DOI: 10.1038/s41598-019-43985-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 04/28/2019] [Indexed: 12/25/2022] Open
Abstract
Ampk is an energy gatekeeper that responds to decreases in ATP by inhibiting energy-consuming anabolic processes and promoting energy-generating catabolic processes. Recently, we showed that Lkb1, an understudied kinase in B lymphocytes and a major upstream kinase for Ampk, had critical and unexpected roles in activating naïve B cells and in germinal center formation. Therefore, we examined whether Lkb1 activities during B cell activation depend on Ampk and report surprising Ampk activation with in vitro B cell stimulation in the absence of energy stress, coupled to rapid biomass accumulation. Despite Ampk activation and a controlling role for Lkb1 in B cell activation, Ampk knockout did not significantly affect B cell activation, differentiation, nutrient dynamics, gene expression, or humoral immune responses. Instead, Ampk loss specifically repressed the transcriptional expression of IgD and its regulator, Zfp318. Results also reveal that early activation of Ampk by phenformin treatment impairs germinal center formation but does not significantly alter antibody responses. Combined, the data show an unexpectedly specific role for Ampk in the regulation of IgD expression during B cell activation.
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Affiliation(s)
- Lynnea R Waters
- Molecular Biology Interdepartmental Program, UCLA, Los Angeles, CA, 90095, USA
- Department of Pathology and Laboratory Medicine, UCLA, Los Angeles, CA, 90095, USA
| | - Fasih M Ahsan
- Department of Pathology and Laboratory Medicine, UCLA, Los Angeles, CA, 90095, USA
| | - Johanna Ten Hoeve
- Department of Molecular and Medical Pharmacology, UCLA, Los Angeles, CA, 90095, USA
- UCLA Metabolomics Center, UCLA, Los Angeles, CA, 90095, USA
- Crump Institute for Molecular Imaging, UCLA, Los Angeles, CA, 90095, USA
| | - Jason S Hong
- Department of Pathology and Laboratory Medicine, UCLA, Los Angeles, CA, 90095, USA
| | - Diane N H Kim
- Department of Bioengineering, UCLA, Los Angeles, CA, 90095, USA
| | - Aspram Minasyan
- Department of Molecular and Medical Pharmacology, UCLA, Los Angeles, CA, 90095, USA
- Crump Institute for Molecular Imaging, UCLA, Los Angeles, CA, 90095, USA
| | - Daniel Braas
- Department of Molecular and Medical Pharmacology, UCLA, Los Angeles, CA, 90095, USA
- UCLA Metabolomics Center, UCLA, Los Angeles, CA, 90095, USA
- Crump Institute for Molecular Imaging, UCLA, Los Angeles, CA, 90095, USA
| | - Thomas G Graeber
- Department of Molecular and Medical Pharmacology, UCLA, Los Angeles, CA, 90095, USA
- UCLA Metabolomics Center, UCLA, Los Angeles, CA, 90095, USA
- Crump Institute for Molecular Imaging, UCLA, Los Angeles, CA, 90095, USA
- Jonsson Comprehensive Cancer Center, UCLA, Los Angeles, CA, 90095, USA
- California NanoSystems Institute, UCLA, Los Angeles, CA, 90095, USA
- Broad Stem Cell Research Center, UCLA, Los Angeles, CA, 90095, USA
| | - Thomas A Zangle
- Department of Chemical Engineering, University of Utah, Salt Lake City, UT, 84112, USA
- Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, 84112, USA
| | - Michael A Teitell
- Molecular Biology Interdepartmental Program, UCLA, Los Angeles, CA, 90095, USA.
- Department of Pathology and Laboratory Medicine, UCLA, Los Angeles, CA, 90095, USA.
- Department of Bioengineering, UCLA, Los Angeles, CA, 90095, USA.
- Jonsson Comprehensive Cancer Center, UCLA, Los Angeles, CA, 90095, USA.
- California NanoSystems Institute, UCLA, Los Angeles, CA, 90095, USA.
- Broad Stem Cell Research Center, UCLA, Los Angeles, CA, 90095, USA.
- Department of Pediatrics, UCLA, Los Angeles, CA, 90095, USA.
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14
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Griffin JJ, Polanco ER, Zangle TA. Index-Matched Microfluidic Cell Array for High throughput Single Cell Optical Analysis. Biophys J 2019. [DOI: 10.1016/j.bpj.2018.11.2403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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15
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Pradeep S, Zangle TA. Quantifying Intracellular Mass Generation using Quantitative Phase Microscopy. Biophys J 2019. [DOI: 10.1016/j.bpj.2018.11.1514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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16
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Abstract
The use of microfluidic devices has emerged as a defining tool for biomedical applications. When combined with modern microscopy techniques, these devices can be implemented as part of a robust platform capable of making simultaneous complementary measurements. The primary challenge created by the combination of these two techniques is the mismatch in refractive index between the materials traditionally used to make microfluidic devices and the aqueous solutions typically used in biomedicine. This mismatch can create optical artifacts near the channel or device edges. One solution is to reduce the refractive index of the material used to fabricate the device by using a fluorinated polymer such as MY133-V2000 whose refractive index is similar to that of water (n = 1.33). Here, the construction of a microfluidic device made out of MY133-V2000 using soft lithography techniques is demonstrated, using O2 plasma in conjunction with an acrylic holder to increase the adhesion between the MY133-V2000 fabricated device and the polydimethylsiloxane (PDMS) substrate. The device is then tested by incubating it filled with cell culture media for 24 h to demonstrate the ability of the device to maintain cell culture conditions during the course of a typical imaging experiment. Finally, quantitative phase microscopy (QPM) is used to measure the distribution of mass within the live adherent cells in the microchannel. This way, the increased precision, enabled by fabricating the device from a low index of refraction polymer such as MY133-V2000 in lieu of traditional soft lithography materials such as PDMS, is demonstrated. Overall, this approach for fabricating microfluidic devices can be readily integrated into existing soft lithography workflows in order to reduce optical artifacts and increase measurement precision.
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Affiliation(s)
| | | | - Thomas A Zangle
- Department of Chemical Engineering, University of Utah; Huntsman Cancer Institute, University of Utah;
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17
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Abstract
Rapid antibody production in response to invading pathogens requires the dramatic expansion of pathogen-derived antigen-specific B lymphocyte populations. Whether B cell population dynamics are based on stochastic competition between competing cell fates, as in the development of competence by the bacterium Bacillus subtilis, or on deterministic cell fate decisions that execute a predictable program, as during the development of the worm Caenorhabditis elegans, remains unclear. Here, we developed long-term live-cell microscopy of B cell population expansion and multiscale mechanistic computational modeling to characterize the role of molecular noise in determining phenotype heterogeneity. We show that the cell lineage trees underlying B cell population dynamics are mediated by a largely predictable decision-making process where the heterogeneity of cell proliferation and death decisions at any given timepoint largely derives from nongenetic heterogeneity in the founder cells. This means that contrary to previous models, only a minority of genetically identical founder cells contribute the majority to the population response. We computationally predict and experimentally confirm nongenetic molecular determinants that are predictive of founder cells' proliferative capacity. While founder cell heterogeneity may arise from different exposure histories, we show that it may also be due to the gradual accumulation of small amounts of intrinsic noise during the lineage differentiation process of hematopoietic stem cells to mature B cells. Our finding of the largely deterministic nature of B lymphocyte responses may provide opportunities for diagnostic and therapeutic development.
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Affiliation(s)
- Simon Mitchell
- Institute for Quantitative and Computational Biosciences, University of California, Los Angeles, CA 90095
- Department of Microbiology, Immunology, and Molecular Genetics, University of California, Los Angeles, CA 90095
| | - Koushik Roy
- Institute for Quantitative and Computational Biosciences, University of California, Los Angeles, CA 90095
- Department of Microbiology, Immunology, and Molecular Genetics, University of California, Los Angeles, CA 90095
| | - Thomas A Zangle
- Department Chemical Engineering and Huntsman Cancer Institute, University of Utah, Salt Lake City, UT 84112
| | - Alexander Hoffmann
- Institute for Quantitative and Computational Biosciences, University of California, Los Angeles, CA 90095;
- Department of Microbiology, Immunology, and Molecular Genetics, University of California, Los Angeles, CA 90095
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18
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Huang D, Leslie KA, Guest D, Yeshcheulova O, Roy IJ, Piva M, Moriceau G, Zangle TA, Lo RS, Teitell MA, Reed J. High-Speed Live-Cell Interferometry: A New Method for Quantifying Tumor Drug Resistance and Heterogeneity. Anal Chem 2018; 90:3299-3306. [PMID: 29381859 DOI: 10.1021/acs.analchem.7b04828] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
We report the development of high-speed live-cell interferometry (HSLCI), a new multisample, multidrug testing platform for directly measuring tumor therapy response via real-time optical cell biomass measurements. As a proof of concept, we show that HSLCI rapidly profiles changes in biomass in BRAF inhibitor (BRAFi)-sensitive parental melanoma cell lines and in their isogenic BRAFi-resistant sublines. We show reproducible results from two different HSLCI platforms at two institutions that generate biomass kinetic signatures capable of discriminating between BRAFi-sensitive and -resistant melanoma cells within 24 h. Like other quantitative phase imaging (QPI) modalities, HSLCI is well-suited to noninvasive measurements of single cells and cell clusters, requiring no fluorescence or dye labeling. HSLCI is substantially faster and more sensitive than field-standard growth inhibition assays, and in terms of the number of cells measured simultaneously, the number of drugs tested in parallel, and temporal measurement range, it exceeds the state of the art by more than 10-fold. The accuracy and speed of HSLCI in profiling tumor cell heterogeneity and therapy resistance are promising features of potential tools to guide patient therapeutic selections.
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Affiliation(s)
| | - Kevin A Leslie
- Department of Physics , Virginia Commonwealth University , Richmond , Virginia 23284 , United States
| | - Daniel Guest
- Department of Physics , Virginia Commonwealth University , Richmond , Virginia 23284 , United States
| | - Olga Yeshcheulova
- Department of Physics , Virginia Commonwealth University , Richmond , Virginia 23284 , United States
| | | | | | | | - Thomas A Zangle
- Department of Chemical Engineering , University of Utah , Salt Lake City , Utah 84112 , United States
| | | | | | - Jason Reed
- Department of Physics , Virginia Commonwealth University , Richmond , Virginia 23284 , United States.,Massey Cancer Center , Virginia Commonwealth University , Richmond , Virginia 23298 , United States
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19
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Kim DN, Kim KT, Kim C, Teitell MA, Zangle TA. Soft lithography fabrication of index-matched microfluidic devices for reducing artifacts in fluorescence and quantitative phase imaging. Microfluid Nanofluidics 2018; 22:2. [PMID: 29725276 PMCID: PMC5927392 DOI: 10.1007/s10404-017-2023-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Accepted: 11/24/2017] [Indexed: 05/22/2023]
Abstract
Microfluidic devices are widely used for biomedical applications based on microscopy or other optical detection methods. However, the materials commonly used for microfabrication typically have a high refractive index relative to water, which can create artifacts at device edges and limit applicability to applications requiring high precision imaging or morphological feature detection. Here we present a soft lithography method to fabricate microfluidic devices out of MY133-V2000, a UV-curable, fluorinated polymer with low refractive index that is close to that of water (n = 1.33). The primary challenge in the use of this material (and fluorinated materials in general) is the low adhesion of the fluorinated material; we present several alternative fabrication methods we have tested to improve inter-layer adhesion. The close match between the refractive index of this material and aqueous solutions commonly used in biomedical applications enables fluorescence imaging at microchannel or other microfabricated edges without distortion. The close match in refractive index also enables quantitative phase microscopy (QPM) imaging across the full width of microchannels without error-inducing artifacts for measurement of cell biomass. Overall, our results demonstrate the utility of low-refractive index microfluidics for biological applications requiring high precision optical imaging.
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Affiliation(s)
- Diane N.H. Kim
- Department of Bioengineering, University of California, Los Angeles (UCLA), Los Angeles, California, USA
| | - Kevin T. Kim
- Department of Neuroscience, UCLA, Los Angeles, California, USA
| | - Carolyn Kim
- Department of Bioengineering, University of California, Los Angeles (UCLA), Los Angeles, California, USA
| | - Michael A. Teitell
- Department of Bioengineering, University of California, Los Angeles (UCLA), Los Angeles, California, USA
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, Broad Stem Cell Research Center, California Nanosystems Institute, and Molecular Biology Institute, University of California, Los Angeles, Los Angeles, California, USA
| | - Thomas A. Zangle
- Department of Chemical Engineering and Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah, USA
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20
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Polanco ER, Nguyen T, Teitell MA, Zangle TA. Quantifying Cellular Elasticity using Quantitative Phase Microscopy Measurements of Electromagnetically Actuated Magnetic Microsphere Indentation. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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21
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Nguyen TL, Teitell MA, Zangle TA. Quantifying the Effects of Cell Division on Mass Redistribution Dynamics in Multicellular Clusters using Live Cell Interferometry. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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22
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23
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Kim DN, Teitell MA, Reed J, Zangle TA. Hybrid Random Walk-Linear Discriminant Analysis Method for Unwrapping Quantitative Phase Images of Biological Samples. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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24
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Zangle TA, Teitell MA. Live-cell mass profiling: an emerging approach in quantitative biophysics. Nat Methods 2015; 11:1221-8. [PMID: 25423019 DOI: 10.1038/nmeth.3175] [Citation(s) in RCA: 150] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Accepted: 07/22/2014] [Indexed: 12/16/2022]
Abstract
Cell mass, volume and growth rate are tightly controlled biophysical parameters in cellular development and homeostasis, and pathological cell growth defines cancer in metazoans. The first measurements of cell mass were made in the 1950s, but only recently have advances in computer science and microfabrication spurred the rapid development of precision mass-quantifying approaches. Here we discuss available techniques for quantifying the mass of single live cells with an emphasis on relative features, capabilities and drawbacks for different applications.
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Affiliation(s)
- Thomas A Zangle
- Department of Bioengineering, University of California, Los Angeles (UCLA), Los Angeles, California, USA
| | - Michael A Teitell
- 1] Department of Bioengineering, University of California, Los Angeles (UCLA), Los Angeles, California, USA. [2] Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, California, USA. [3] California NanoSystems Institute, UCLA, Los Angeles, California, USA. [4] Broad Stem Cell Research Center, UCLA, Los Angeles, California, USA. [5] Jonsson Comprehensive Cancer Center, UCLA, Los Angeles, California, USA. [6] Molecular Biology Institute, UCLA, Los Angeles, California, USA
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25
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Kim DNH, Teitell MA, Reed J, Zangle TA. Hybrid random walk-linear discriminant analysis method for unwrapping quantitative phase microscopy images of biological samples. J Biomed Opt 2015; 20:111211. [PMID: 26305212 PMCID: PMC4652035 DOI: 10.1117/1.jbo.20.11.111211] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Accepted: 07/22/2015] [Indexed: 05/30/2023]
Abstract
Standard algorithms for phase unwrapping often fail for interferometric quantitative phase imaging (QPI) of biological samples due to the variable morphology of these samples and the requirement to image at low light intensities to avoid phototoxicity. We describe a new algorithm combining random walk-based image segmentation with linear discriminant analysis (LDA)-based feature detection, using assumptions about the morphology of biological samples to account for phase ambiguities when standard methods have failed. We present three versions of our method: first, a method for LDA image segmentation based on a manually compiled training dataset; second, a method using a random walker (RW) algorithm informed by the assumed properties of a biological phase image; and third, an algorithm which combines LDA-based edge detection with an efficient RW algorithm. We show that the combination of LDA plus the RW algorithm gives the best overall performance with little speed penalty compared to LDA alone, and that this algorithm can be further optimized using a genetic algorithm to yield superior performance for phase unwrapping of QPI data from biological samples.
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Affiliation(s)
- Diane N. H. Kim
- University of California, Los Angeles, Department of Bioengineering, TLSB 3126, California 90095, United States
| | - Michael A. Teitell
- University of California, Los Angeles, Department of Bioengineering, TLSB 3126, California 90095, United States
- University of California, Los Angeles, Jonsson Comprehensive Cancer Center, 8-950 Factor Building, California 90095, United States
- University of California, Los Angeles, Broad Stem Cell Research Center, Box 957357, California 90095, United States
- University of California, Los Angeles, David Geffen School of Medicine, Department of Pathology and Laboratory Medicine, MRL 4762, California 90095, United States
- University of California, Los Angeles, NanoSystems Institute, 570 Westwood Plaza, California 90095, United States
- University of California, Los Angeles, Molecular Biology Institute, Box 951570, California 90095, United States
| | - Jason Reed
- Virginia Commonwealth University, Department of Physics, 701 West Grace Street, Richmond, Virginia 23284, United States
- Virginia Commonwealth University, Massey Cancer Center, 401 College Street, Richmond, Virginia 23284, United States
| | - Thomas A. Zangle
- University of California, Los Angeles, Department of Bioengineering, TLSB 3126, California 90095, United States
- University of California, Los Angeles, Jonsson Comprehensive Cancer Center, 8-950 Factor Building, California 90095, United States
- University of California, Los Angeles, Broad Stem Cell Research Center, Box 957357, California 90095, United States
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26
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Abstract
The equal partitioning of cell mass between daughters is the usual and expected outcome of cytokinesis for self-renewing cells. However, most studies of partitioning during cell division have focused on daughter cell shape symmetry or segregation of chromosomes. Here, we use live cell interferometry (LCI) to quantify the partitioning of daughter cell mass during and following cytokinesis. We use adherent and non-adherent mouse fibroblast and mouse and human lymphocyte cell lines as models and show that, on average, mass asymmetries present at the time of cleavage furrow formation persist through cytokinesis. The addition of multiple cytoskeleton-disrupting agents leads to increased asymmetry in mass partitioning which suggests the absence of active mass partitioning mechanisms after cleavage furrow positioning.
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Affiliation(s)
- Thomas A. Zangle
- Department of Bioengineering, University of California Los Angeles (UCLA), Los Angeles, California, United States of America
- Jonsson Comprehensive Cancer Center, UCLA, Los Angeles, California, United States of America
- * E-mail: (TAZ); (JR)
| | - Michael A. Teitell
- Department of Bioengineering, University of California Los Angeles (UCLA), Los Angeles, California, United States of America
- Jonsson Comprehensive Cancer Center, UCLA, Los Angeles, California, United States of America
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, California, United States of America
- California NanoSystems Institute, UCLA, Los Angeles, California, United States of America
- Broad Stem Cell Research Center, UCLA, Los Angeles, California, United States of America
- Molecular Biology Institute, UCLA, Los Angeles, California, United States of America
| | - Jason Reed
- Department of Physics, Virginia Commonwealth University (VCU), Richmond, Virginia, United States of America
- VCU Massey Cancer Center, Richmond, Virginia, United States of America
- * E-mail: (TAZ); (JR)
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27
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Senese S, Lo YC, Huang D, Zangle TA, Gholkar AA, Robert L, Homet B, Ribas A, Summers MK, Teitell MA, Damoiseaux R, Torres JZ. Chemical dissection of the cell cycle: probes for cell biology and anti-cancer drug development. Cell Death Dis 2014; 5:e1462. [PMID: 25321469 PMCID: PMC4237247 DOI: 10.1038/cddis.2014.420] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 08/27/2014] [Accepted: 08/28/2014] [Indexed: 12/02/2022]
Abstract
Cancer cell proliferation relies on the ability of cancer cells to grow, transition through the cell cycle, and divide. To identify novel chemical probes for dissecting the mechanisms governing cell cycle progression and cell division, and for developing new anti-cancer therapeutics, we developed and performed a novel cancer cell-based high-throughput chemical screen for cell cycle modulators. This approach identified novel G1, S, G2, and M-phase specific inhibitors with drug-like properties and diverse chemotypes likely targeting a broad array of processes. We further characterized the M-phase inhibitors and highlight the most potent M-phase inhibitor MI-181, which targets tubulin, inhibits tubulin polymerization, activates the spindle assembly checkpoint, arrests cells in mitosis, and triggers a fast apoptotic cell death. Importantly, MI-181 has broad anti-cancer activity, especially against BRAFV600E melanomas.
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Affiliation(s)
- S Senese
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA
| | - Y C Lo
- 1] Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA [2] Department of Bioengineering, University of California, Los Angeles, CA, USA
| | - D Huang
- Department of Bioengineering, University of California, Los Angeles, CA, USA
| | - T A Zangle
- Department of Bioengineering, University of California, Los Angeles, CA, USA
| | - A A Gholkar
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA
| | - L Robert
- Department of Medicine (Division of Hematology-Oncology), David Geffen School of Medicine, University of California, Los Angeles, CA, USA
| | - B Homet
- Department of Medicine (Division of Hematology-Oncology), David Geffen School of Medicine, University of California, Los Angeles, CA, USA
| | - A Ribas
- 1] Department of Medicine (Division of Hematology-Oncology), David Geffen School of Medicine, University of California, Los Angeles, CA, USA [2] Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California, Los Angeles, CA, USA [3] Department of Surgery (Division of Surgical-Oncology), David Geffen School of Medicine, University of California, Los Angeles, CA, USA [4] Jonsson Comprehensive Cancer Center, University of California, Los Angeles, CA, USA
| | - M K Summers
- The Department of Cancer Biology, Lerner Research Institute, Cleveland, OH, USA
| | - M A Teitell
- 1] Department of Bioengineering, University of California, Los Angeles, CA, USA [2] Jonsson Comprehensive Cancer Center, University of California, Los Angeles, CA, USA [3] Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at the University of California, Los Angeles, CA, USA [4] Broad Stem Cell Research Center, University of California, Los Angeles, CA, USA [5] California NanoSystems Institute, University of California, Los Angeles, CA, USA [6] Molecular Biology Institute, University of California, Los Angeles, CA, USA
| | - R Damoiseaux
- California NanoSystems Institute, University of California, Los Angeles, CA, USA
| | - J Z Torres
- 1] Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA [2] Jonsson Comprehensive Cancer Center, University of California, Los Angeles, CA, USA [3] Molecular Biology Institute, University of California, Los Angeles, CA, USA
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28
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Zangle TA, Chun J, Zhang J, Reed J, Teitell MA. Quantification of biomass and cell motion in human pluripotent stem cell colonies. Biophys J 2014; 105:593-601. [PMID: 23931307 DOI: 10.1016/j.bpj.2013.06.041] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2013] [Revised: 06/11/2013] [Accepted: 06/24/2013] [Indexed: 12/28/2022] Open
Abstract
Somatic cell reprogramming to pluripotency requires an immediate increase in cell proliferation and reduction in cell size. It is unknown whether proliferation and biomass controls are similarly coordinated with early events during the differentiation of pluripotent stem cells (PSCs). This impasse exists because PSCs grow in tight clusters or colonies, precluding most quantifying approaches. Here, we investigate live cell interferometry as an approach to quantify the biomass and growth of HSF1 human PSC colonies before and during retinoic acid-induced differentiation. We also provide an approach for measuring the rate and coordination of intracolony mass redistribution in HSF1 clusters using live cell interferometry images. We show that HSF1 cells grow at a consistent, exponential rate regardless of colony size and display coordinated intracolony movement that ceases with the onset of differentiation. By contrast, growth and proliferation rates show a decrease of only ∼15% decrease during early differentiation despite global changes in gene expression and previously reported changes in energy metabolism. Overall, these results suggest that cell biomass and proliferation are regulated independent of pluripotency during early differentiation, which is distinct from what occurs with successful reprogramming.
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Affiliation(s)
- Thomas A Zangle
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at the University of California at Los Angeles, USA
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29
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Zangle TA, Burnes D, Mathis C, Witte ON, Teitell MA. High-Throughput Screening of T Cell Cytotoxic Events by Biomass Profiling. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.4449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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30
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Zangle TA, Burnes D, Mathis C, Witte ON, Teitell MA. Quantifying biomass changes of single CD8+ T cells during antigen specific cytotoxicity. PLoS One 2013; 8:e68916. [PMID: 23935904 PMCID: PMC3720853 DOI: 10.1371/journal.pone.0068916] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2013] [Accepted: 06/03/2013] [Indexed: 11/18/2022] Open
Abstract
Existing approaches that quantify cytotoxic T cell responses rely on bulk or surrogate measurements which impede the direct identification of single activated T cells of interest. Single cell microscopy or flow cytometry methodologies typically rely on fluorescent labeling, which limits applicability to primary cells such as human derived T lymphocytes. Here, we introduce a quantitative method to track single T lymphocyte mediated cytotoxic events within a mixed population of cells using live cell interferometry (LCI), a label-free microscopy technique that maintains cell viability. LCI quantifies the mass distribution within individual cells by measuring the phase shift caused by the interaction of light with intracellular biomass. Using LCI, we imaged cytotoxic T cells killing cognate target cells. In addition to a characteristic target cell mass decrease of 20–60% over 1–4 h following attack by a T cell, there was a significant 4-fold increase in T cell mass accumulation rate at the start of the cytotoxic event and a 2–3 fold increase in T cell mass relative to the mass of unresponsive T cells. Direct, label-free measurement of CD8+ T and target cell mass changes provides a kinetic, quantitative assessment of T cell activation and a relatively rapid approach to identify specific, activated patient-derived T cells for applications in cancer immunotherapy.
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Affiliation(s)
- Thomas A. Zangle
- Department of Pathology and Laboratory Medicine, University of California Los Angeles, Los Angeles, California, United States of America
| | - Daina Burnes
- Department of Molecular and Medical Pharmacology, University of California Los Angeles, Los Angeles, California, United States of America
| | - Colleen Mathis
- Department of Microbiology, Immunology, and Molecular Genetics, University of California Los Angeles, Los Angeles, California, United States of America
| | - Owen N. Witte
- Department of Molecular and Medical Pharmacology, University of California Los Angeles, Los Angeles, California, United States of America
- Department of Microbiology, Immunology, and Molecular Genetics, University of California Los Angeles, Los Angeles, California, United States of America
- Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California Los Angeles, Los Angeles, California, United States of America
- Howard Hughes Medical Institute, University of California Los Angeles, Los Angeles, California, United States of America
- * E-mail: (ONW); (MAT)
| | - Michael A. Teitell
- Department of Pathology and Laboratory Medicine, University of California Los Angeles, Los Angeles, California, United States of America
- Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California Los Angeles, Los Angeles, California, United States of America
- Bioengineering Interdepartmental Program, University of California Los Angeles, Los Angeles, California, United States of America
- Molecular Biology Institute, Jonsson Comprehensive Cancer Center, and California NanoSystems Institute, University of California Los Angeles, Los Angeles, California, United States of America
- * E-mail: (ONW); (MAT)
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31
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Zangle TA, Chun J, Zhang J, Reed J, Teitell MA. Biophysical Characterization of Pluripotent Stem Cell Mass Accumulation Rate and Intracolony Motion. Biophys J 2013. [DOI: 10.1016/j.bpj.2012.11.3695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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32
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Chun J, Zangle TA, Kolarova T, Finn RS, Teitell MA, Reed J. Rapidly quantifying drug sensitivity of dispersed and clumped breast cancer cells by mass profiling. Analyst 2012; 137:5495-8. [PMID: 23057068 DOI: 10.1039/c2an36058f] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Live cell mass profiling is a promising new approach for rapidly quantifying responses to therapeutic agents through picogram-scale changes in cell mass over time. A significant barrier in mass profiling is the inability of existing methods to handle pleomorphic cellular clusters and clumps, which are more commonly present in patient-derived samples or tissue cultures than are isolated single cells. Here we demonstrate automated Live Cell Interferometry (LCI) as a rapid and accurate quantifier of the sensitivity of single cell and colony-forming human breast cancer cell lines to the HER2-directed monoclonal antibody, trastuzumab (Herceptin). The relative sensitivities of small samples (<500 cells) of four breast cancer cell lines were determined tens-to-hundreds of times faster than is possible with traditional proliferation assays. These LCI advances in clustered sample assessment and speed open up the possibility for therapeutic response testing of patient-derived solid tumor samples, which are viable only for short periods ex vivo and likely to be in the form of cell aggregates and clusters.
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Affiliation(s)
- Jennifer Chun
- Bioengineering Interdepartmental Program, Los Angeles, California, USA
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Reed J, Chun J, Zangle TA, Kalim S, Hong JS, Pefley SE, Zheng X, Gimzewski JK, Teitell MA. Rapid, massively parallel single-cell drug response measurements via live cell interferometry. Biophys J 2011; 101:1025-31. [PMID: 21889438 DOI: 10.1016/j.bpj.2011.07.022] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2011] [Revised: 05/14/2011] [Accepted: 07/18/2011] [Indexed: 12/15/2022] Open
Abstract
A central question in cancer therapy is how individual cells within a population of tumor cells respond to drugs designed to arrest their growth. However, the absolute growth of cells, their change in physical mass, whether cancerous or physiologic, is difficult to measure directly with traditional techniques. Here, we develop live cell interferometry for rapid, real-time quantification of cell mass in cells exposed to a changing environment. We used tunicamycin induction of the unfolded protein stress response in multiple myeloma cells to generate a mass response that was temporally profiled for hundreds of cells simultaneously. Within 2 h, the treated cells were growth suppressed compared to controls, with a few cells in both populations showing a robust increase (+15%) or little change (<5%) in mass accumulation. Overall, live cell interferometry provides a conceptual advance for assessing cell populations to identify, monitor, and measure single cell responses, such as to therapeutic drugs.
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Affiliation(s)
- Jason Reed
- California NanoSystems Institute, David Geffen School of Medicine, Jonsson Comprehensive Cancer Center, University of California, Los Angeles, California, USA.
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Suss ME, Mani A, Zangle TA, Santiago JG. Electroosmotic pump performance is affected by concentration polarizations of both electrodes and pump. Sens Actuators A Phys 2011; 165:310-315. [PMID: 21516230 PMCID: PMC3079224 DOI: 10.1016/j.sna.2010.10.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Current methods of optimizing electroosmotic (EO) pump performance include reducing pore diameter and reducing ionic strength of the pumped electrolyte. However, these approaches each increase the fraction of total ionic current carried by diffuse electric double layer (EDL) counterions. When this fraction becomes significant, concentration polarization (CP) effects become important, and traditional EO pump models are no longer valid. We here report on the first simultaneous concentration field measurements, pH visualizations, flow rate, and voltage measurements on such systems. Together, these measurements elucidate key parameters affecting EO pump performance in the CP dominated regime. Concentration field visualizations show propagating CP enrichment and depletion fronts sourced by our pump substrate and traveling at order mm/min velocities through millimeter-scale channels connected serially to our pump. The observed propagation in millimeter-scale channels is not explained by current propagating CP models. Additionally, visualizations show that CP fronts are sourced by and propagate from the electrodes of our system, and then interact with the EO pump-generated CP zones. With pH visualizations, we directly detect that electrolyte properties vary sharply across the anode enrichment front interface. Our observations lead us to hypothesize possible mechanisms for the propagation of both pump- and electrode-sourced CP zones. Lastly, our experiments show the dynamics associated with the interaction of electrode and membrane CP fronts, and we describe the effect of these phenomena on EO pump flow rates and applied voltages under galvanostatic conditions.
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Affiliation(s)
| | | | | | - Juan G. Santiago
- Corresponding author: 440 Escondido Mall, Bldg 530, rm 224, Stanford, CA, 94305, tel: 1-650-723-5689, fax: 1-650-723-7657,
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Abstract
We extend the analytical theory of propagating concentration polarization (CP) to describe and compare the effects of constant-voltage versus constant-current conditions on the transient development of CP enrichment and depletion zones. We support our analysis with computational and experimental results. We find that at constant voltage, enrichment and depletion regions spread as t(1/2) as opposed to the previously observed t(1) scaling for constant current conditions. At low, constant voltages, the growth and propagation of CP zones can easily be misinterpreted as nonpropagating behavior.
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Zangle TA, Mani A, Santiago JG. Theory and experiments of concentration polarization and ion focusing at microchannel and nanochannel interfaces. Chem Soc Rev 2010; 39:1014-35. [DOI: 10.1039/b902074h] [Citation(s) in RCA: 221] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Mani A, Zangle TA, Santiago JG. On the propagation of concentration polarization from microchannel-nanochannel interfaces. Part I: Analytical model and characteristic analysis. Langmuir 2009; 25:3898-908. [PMID: 19275187 PMCID: PMC4816500 DOI: 10.1021/la803317p] [Citation(s) in RCA: 145] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We develop two models to describe ion transport in variable-height micro- and nanochannels. For the first model, we obtain a one-dimensional (unsteady) partial differential equation governing flow and charge transport through a shallow and wide electrokinetic channel. In this model, the effects of electric double layer (EDL) on axial transport are taken into account using exact solutions of the Poisson-Boltzmann equation. The second simpler model, which is approachable analytically, assumes that the EDLs are confined to near-wall regions. Using a characteristics analysis, we show that the latter model captures concentration polarization (CP) effects and provides useful insight into its dynamics. Two distinct CP regimes are identified: CP with propagation in which enrichment and depletion shocks propagate outward, and CP without propagation where polarization effects stay local to micro- nanochannel interfaces. The existence of each regime is found to depend on a nanochannel Dukhin number and mobility of the co-ion nondimensionalized by electroosmotic mobility. Interestingly, microchannel dimensions and axial diffusion are found to play an insignificant role in determining whether CP propagates. The steady state condition of propagating CP is shown to be controlled by channel heights, surface chemistry, and co-ion mobility instead of the reservoir condition. Both models are validated against experimental results in Part II of this two-paper series.
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Affiliation(s)
| | | | - Juan G. Santiago
- 440 Escondido Mall, Bldg 530, room 225, Stanford, CA 94305, , Fax: (650) 723-7657
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Zangle TA, Mani A, Santiago JG. On the propagation of concentration polarization from microchannel-nanochannel interfaces. Part II: Numerical and experimental study. Langmuir 2009; 25:3909-16. [PMID: 19275188 PMCID: PMC4816496 DOI: 10.1021/la803318e] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We present results of a combined computational and experimental study of the propagation of concentration polarization (CP) zones in a microchannel-nanochannel system. Our computational model considers the combined effects of bulk flow, electromigration, and diffusion and accurately captures the dynamics of CP. Using wall charge inside the nanochannel as a single fitting parameter, we predict experimentally observed enrichment and depletion shock velocities. Our model can also be used to compute the existence of CP with propagating enrichment and depletion shocks on the basis of measured ion mobility and wall properties. We present experiments where the background electrolyte consists of only a fluorescent ion and its counterion. These results are used to validate the computational model and to confirm predicted trends from an analytical model presented in the first of this two-paper series. We show experimentally that the enrichment region concentration is effectively independent of the applied current, while the enrichment and depletion shock velocities increase in proportion to current density.
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Affiliation(s)
| | | | - Juan G. Santiago
- 440 Escondido Mall, Bldg 530, room 225, Stanford, CA 94305, , Fax: (650) 723-7657
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