1
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Kassianidou E, Probst D, Jäger J, Lee S, Roguet AL, Schwarz US, Kumar S. Extracellular Matrix Geometry and Initial Adhesive Position Determine Stress Fiber Network Organization during Cell Spreading. Cell Rep 2020; 27:1897-1909.e4. [PMID: 31067472 DOI: 10.1016/j.celrep.2019.04.035] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 02/25/2019] [Accepted: 04/05/2019] [Indexed: 01/13/2023] Open
Abstract
Three-dimensional matrices often contain highly structured adhesive tracks that require cells to turn corners and bridge non-adhesive areas. Here, we investigate these complex processes using micropatterned cell adhesive frames. Spreading kinetics on these matrices depend strongly on initial adhesive position and are predicted by a cellular Potts model (CPM), which reflects a balance between adhesion and intracellular tension. As cells spread, new stress fibers (SFs) assemble periodically and parallel to the leading edge, with spatial intervals of ∼2.5 μm, temporal intervals of ∼15 min, and characteristic lifetimes of ∼50 min. By incorporating these rules into the CPM, we can successfully predict SF network architecture. Moreover, we observe broadly similar behavior when we culture cells on arrays of discrete collagen fibers. Our findings show that ECM geometry and initial cell position strongly determine cell spreading and that cells encode a memory of their spreading history through SF network organization.
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Affiliation(s)
- Elena Kassianidou
- Department of Bioengineering, University of California, Berkeley, CA 94720-1762, USA; UC Berkeley-UCSF Graduate Program in Bioengineering, University of California, Berkeley, Berkeley, CA 94720-1762, USA
| | - Dimitri Probst
- Heidelberg University, Institute for Theoretical Physics and BioQuant-Center for Quantitative Biology, Philosophenweg 19, 69120 Heidelberg, Germany
| | - Julia Jäger
- Heidelberg University, Institute for Theoretical Physics and BioQuant-Center for Quantitative Biology, Philosophenweg 19, 69120 Heidelberg, Germany
| | - Stacey Lee
- Department of Bioengineering, University of California, Berkeley, CA 94720-1762, USA; UC Berkeley-UCSF Graduate Program in Bioengineering, University of California, Berkeley, Berkeley, CA 94720-1762, USA
| | - Anne-Lou Roguet
- Department of Bioengineering, University of California, Berkeley, CA 94720-1762, USA; École Polytechnique, 91120 Palaiseau, France
| | - Ulrich Sebastian Schwarz
- Heidelberg University, Institute for Theoretical Physics and BioQuant-Center for Quantitative Biology, Philosophenweg 19, 69120 Heidelberg, Germany.
| | - Sanjay Kumar
- Department of Bioengineering, University of California, Berkeley, CA 94720-1762, USA; UC Berkeley-UCSF Graduate Program in Bioengineering, University of California, Berkeley, Berkeley, CA 94720-1762, USA; Department of Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, CA 94720-1762, USA.
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2
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Krzysztoń R, Woschée D, Reiser A, Schwake G, Strey HH, Rädler JO. Single-cell kinetics of siRNA-mediated mRNA degradation. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2019; 21:102077. [PMID: 31400572 DOI: 10.1016/j.nano.2019.102077] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Revised: 07/26/2019] [Accepted: 07/29/2019] [Indexed: 12/26/2022]
Abstract
RNA interference (RNAi) enables the therapeutic use of small interfering RNAs (siRNAs) to silence disease-related genes. The efficiency of silencing is commonly assessed by measuring expression levels of the target protein at a given time point post-transfection. Here, we determine the siRNA-induced fold change in mRNA degradation kinetics from single-cell fluorescence time-courses obtained using live-cell imaging on single-cell arrays (LISCA). After simultaneous transfection of mRNAs encoding eGFP (target) and CayRFP (reference), the eGFP expression is silenced by siRNA. The single-cell time-courses are fitted using a mathematical model of gene expression. Analysis yields best estimates of related kinetic rate constants, including mRNA degradation constants. We determine the siRNA-induced changes in kinetic rates and their correlations between target and reference protein expression. Assessment of mRNA degradation constants using single-cell time-lapse imaging is fast (<30 h) and returns an accurate, time-independent measure of siRNA-induced silencing, thus allowing the exact evaluation of siRNA therapeutics.
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Affiliation(s)
- Rafał Krzysztoń
- Faculty of Physics, Ludwig-Maximilians-Universität Munich (LMU), Munich, Germany; Graduate School of Quantitative Biosciences (QBM), Ludwig-Maximilians-Universität Munich (LMU), Munich, Germany; Nano systems Initiative Munich (NIM) and Center for NanoScience (CeNS), Munich, Germany.
| | - Daniel Woschée
- Faculty of Physics, Ludwig-Maximilians-Universität Munich (LMU), Munich, Germany; Nano systems Initiative Munich (NIM) and Center for NanoScience (CeNS), Munich, Germany
| | - Anita Reiser
- Faculty of Physics, Ludwig-Maximilians-Universität Munich (LMU), Munich, Germany; Graduate School of Quantitative Biosciences (QBM), Ludwig-Maximilians-Universität Munich (LMU), Munich, Germany; Nano systems Initiative Munich (NIM) and Center for NanoScience (CeNS), Munich, Germany
| | - Gerlinde Schwake
- Faculty of Physics, Ludwig-Maximilians-Universität Munich (LMU), Munich, Germany
| | - Helmut H Strey
- Department of Biomedical Engineering and Laufer Center for Quantitative Biology, Stony Brook University, Stony Brook, NY
| | - Joachim O Rädler
- Faculty of Physics, Ludwig-Maximilians-Universität Munich (LMU), Munich, Germany; Graduate School of Quantitative Biosciences (QBM), Ludwig-Maximilians-Universität Munich (LMU), Munich, Germany; Nano systems Initiative Munich (NIM) and Center for NanoScience (CeNS), Munich, Germany.
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3
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Murschhauser A, Röttgermann PJF, Woschée D, Ober MF, Yan Y, Dawson KA, Rädler JO. A high-throughput microscopy method for single-cell analysis of event-time correlations in nanoparticle-induced cell death. Commun Biol 2019; 2:35. [PMID: 30701200 PMCID: PMC6345847 DOI: 10.1038/s42003-019-0282-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Accepted: 12/27/2018] [Indexed: 12/20/2022] Open
Abstract
The temporal context of cell death decisions remains generally hidden in ensemble measurements with endpoint readouts. Here, we describe a method to extract event times from fluorescence time traces of cell death-related markers in automated live-cell imaging on single-cell arrays (LISCA) using epithelial A549 lung and Huh7 liver cancer cells as a model system. In pairwise marker combinations, we assess the chronological sequence and delay times of the events lysosomal membrane permeabilization, mitochondrial outer membrane permeabilization and oxidative burst after exposure to 58 nm amino-functionalized polystyrene nanoparticles (PS-NH2 nanoparticles). From two-dimensional event-time scatter plots we infer a lysosomal signal pathway at a low dose of nanoparticles (25 µg mL-1) for both cell lines, while at a higher dose (100 µg mL-1) a mitochondrial pathway coexists in A549 cells, but not in Huh7. In general, event-time correlations provide detailed insights into heterogeneity and interdependencies in signal transmission pathways.
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Affiliation(s)
- Alexandra Murschhauser
- Faculty of Physics and Center for NanoSciene (CeNS), Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, Munich, 80539 Germany
| | - Peter J. F. Röttgermann
- Faculty of Physics and Center for NanoSciene (CeNS), Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, Munich, 80539 Germany
| | - Daniel Woschée
- Faculty of Physics and Center for NanoSciene (CeNS), Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, Munich, 80539 Germany
| | - Martina F. Ober
- Faculty of Physics and Center for NanoSciene (CeNS), Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, Munich, 80539 Germany
| | - Yan Yan
- Centre for BioNano Interactions, School of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin 4, Ireland
| | - Kenneth A. Dawson
- Centre for BioNano Interactions, School of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin 4, Ireland
| | - Joachim O. Rädler
- Faculty of Physics and Center for NanoSciene (CeNS), Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, Munich, 80539 Germany
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4
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Fröhlich F, Reiser A, Fink L, Woschée D, Ligon T, Theis FJ, Rädler JO, Hasenauer J. Multi-experiment nonlinear mixed effect modeling of single-cell translation kinetics after transfection. NPJ Syst Biol Appl 2018; 5:1. [PMID: 30564456 PMCID: PMC6288153 DOI: 10.1038/s41540-018-0079-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Accepted: 11/09/2018] [Indexed: 11/10/2022] Open
Abstract
Single-cell time-lapse studies have advanced the quantitative understanding of cellular pathways and their inherent cell-to-cell variability. However, parameters retrieved from individual experiments are model dependent and their estimation is limited, if based on solely one kind of experiment. Hence, methods to integrate data collected under different conditions are expected to improve model validation and information content. Here we present a multi-experiment nonlinear mixed effect modeling approach for mechanistic pathway models, which allows the integration of multiple single-cell perturbation experiments. We apply this approach to the translation of green fluorescent protein after transfection using a massively parallel read-out of micropatterned single-cell arrays. We demonstrate that the integration of data from perturbation experiments allows the robust reconstruction of cell-to-cell variability, i.e., parameter densities, while each individual experiment provides insufficient information. Indeed, we show that the integration of the datasets on the population level also improves the estimates for individual cells by breaking symmetries, although each of them is only measured in one experiment. Moreover, we confirmed that the suggested approach is robust with respect to batch effects across experimental replicates and can provide mechanistic insights into the nature of batch effects. We anticipate that the proposed multi-experiment nonlinear mixed effect modeling approach will serve as a basis for the analysis of cellular heterogeneity in single-cell dynamics.
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Affiliation(s)
- Fabian Fröhlich
- Institute of Computational Biology, Helmholtz Zentrum München, Neuherberg, 85764 Germany
- Center for Mathematics, Technische Universität München, Garching, 85748 Germany
| | - Anita Reiser
- Faculty of Physics and Center for NanoScience, Ludwig-Maximilians-Universität, München, 80539 Germany
| | - Laura Fink
- Faculty of Physics and Center for NanoScience, Ludwig-Maximilians-Universität, München, 80539 Germany
| | - Daniel Woschée
- Faculty of Physics and Center for NanoScience, Ludwig-Maximilians-Universität, München, 80539 Germany
| | - Thomas Ligon
- Faculty of Physics and Center for NanoScience, Ludwig-Maximilians-Universität, München, 80539 Germany
| | - Fabian Joachim Theis
- Institute of Computational Biology, Helmholtz Zentrum München, Neuherberg, 85764 Germany
- Center for Mathematics, Technische Universität München, Garching, 85748 Germany
| | - Joachim Oskar Rädler
- Faculty of Physics and Center for NanoScience, Ludwig-Maximilians-Universität, München, 80539 Germany
| | - Jan Hasenauer
- Institute of Computational Biology, Helmholtz Zentrum München, Neuherberg, 85764 Germany
- Center for Mathematics, Technische Universität München, Garching, 85748 Germany
- Faculty of Mathematics and Natural Sciences, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, 53115 Germany
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5
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Single Cell Microarrays Fabricated by Microscale Plasma-Initiated Protein Patterning (μPIPP). Methods Mol Biol 2018; 1771:41-54. [PMID: 29633203 DOI: 10.1007/978-1-4939-7792-5_4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Micropatterned arrays considerably advanced single cell fluorescence time-lapse measurements by providing standardized boundary conditions for thousands of cells in parallel. In these assays, cells are forced to adhere to defined microstructured protein islands separated by passivated, nonadhesive areas. Here we provide a detailed protocol on how to reproducibly fabricate high quality single cell arrays by microscale plasma-initiated protein patterning (μPIPP). Advantages of μPIPP arrays are the ease of preparation and the unrestricted choice of substrates as well as proteins. We demonstrate how the arrays enable the efficient measurement of single cell time trajectories using automated data acquisition and data analysis by example of single cell gene expression after mRNA transfection and time courses of single cell apoptosis. We discuss the more general use of the protocol for assessment of single cell dynamics with the help of fluorescent reporters.
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6
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Affiliation(s)
- Sonja M. Weiz
- Institute for Integrative Nanosciences (IIN); IFW Dresden; Helmholtzstraße 20 01069 Dresden Germany
| | - Mariana Medina-Sánchez
- Institute for Integrative Nanosciences (IIN); IFW Dresden; Helmholtzstraße 20 01069 Dresden Germany
| | - Oliver G. Schmidt
- Institute for Integrative Nanosciences (IIN); IFW Dresden; Helmholtzstraße 20 01069 Dresden Germany
- Material Systems for Nanoelectronics; Chemnitz University of Technology; Reichenhainer Straße 70 09107 Chemnitz Germany
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7
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Microscopy-based high-throughput assays enable multi-parametric analysis to assess adverse effects of nanomaterials in various cell lines. Arch Toxicol 2017; 92:633-649. [DOI: 10.1007/s00204-017-2106-7] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Accepted: 10/25/2017] [Indexed: 10/18/2022]
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8
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Chatzopoulou EI, Roskopf CC, Sekhavati F, Braciak TA, Fenn NC, Hopfner KP, Oduncu FS, Fey GH, Rädler JO. Chip-based platform for dynamic analysis of NK cell cytolysis mediated by a triplebody. Analyst 2017; 141:2284-95. [PMID: 26958659 DOI: 10.1039/c5an02585k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Cancer therapy via redirected lysis mediated by antibodies and antibody-derived agents relies on the availability of substantial numbers of sufficiently active immune effector cells. To monitor antitumor responses before and during therapy, sensitive methods are needed, capable of quantitating specific lysis of target cells. Here we present a chip-based single-cell cytometric assay, which uses adherent human target cells arrayed in structured micro-fields. Using a fluorescent indicator of cell death and time-lapse microscopy in an automated high-throughput mode, we measured specific target cell lysis by activated human NK cells, mediated by the therapeutic single chain triplebody SPM-2 (33-16-123). This antibody-derived tri-specific fusion protein carries binding sites for the myeloid antigens CD33 and CD123 and recruits NK cells via a binding site for the Fc-receptor CD16. Specific lysis increased with increasing triplebody concentration, and the single-cell assay was validated by direct comparison with a standard calcein-release assay. The chip-based approach allowed measurement of lysis events over 16 hours (compared to 4 hours for the calcein assay) and required far smaller numbers of primary cells. In addition, dynamic properties inaccessible to conventional methods provide new details about the activation of cytolytic effector cells by antibody-derived agents. Thus, the killing rate exhibited a dose-dependent maximum during the reaction interval. In clinical applications ex vivo monitoring of NK activity of patient's endogenous cells will likely help to choose appropriate therapy, to detect impaired or recovered NK function, and possibly to identify rare subsets of cancer cells with particular sensitivity to effector-cell mediated lysis.
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Affiliation(s)
- Elisavet I Chatzopoulou
- Faculty of Physics and Graduate School of Quantitative Biosciences (QBM), Ludwig-Maximilians-Universität, Munich, Germany.
| | - Claudia C Roskopf
- Division of Hematology and Oncology, Medizinische Klinik und Poliklinik IV, Klinikum der Universität München, Munich, Germany
| | - Farzad Sekhavati
- Faculty of Physics and Graduate School of Quantitative Biosciences (QBM), Ludwig-Maximilians-Universität, Munich, Germany.
| | - Todd A Braciak
- Division of Hematology and Oncology, Medizinische Klinik und Poliklinik IV, Klinikum der Universität München, Munich, Germany
| | - Nadja C Fenn
- Department of Biochemistry and Gene Center, Ludwig-Maximilians-Universität, Munich, Germany
| | - Karl-Peter Hopfner
- Department of Biochemistry and Gene Center, Ludwig-Maximilians-Universität, Munich, Germany
| | - Fuat S Oduncu
- Division of Hematology and Oncology, Medizinische Klinik und Poliklinik IV, Klinikum der Universität München, Munich, Germany
| | - Georg H Fey
- Department of Biology, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
| | - Joachim O Rädler
- Faculty of Physics and Graduate School of Quantitative Biosciences (QBM), Ludwig-Maximilians-Universität, Munich, Germany.
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9
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Abstract
Dense monolayers of living cells display intriguing relaxation dynamics, reminiscent of soft and glassy materials close to the jamming transition, and migrate collectively when space is available, as in wound healing or in cancer invasion. Here we show that collective cell migration occurs in bursts that are similar to those recorded in the propagation of cracks, fluid fronts in porous media, and ferromagnetic domain walls. In analogy with these systems, the distribution of activity bursts displays scaling laws that are universal in different cell types and for cells moving on different substrates. The main features of the invasion dynamics are quantitatively captured by a model of interacting active particles moving in a disordered landscape. Our results illustrate that collective motion of living cells is analogous to the corresponding dynamics in driven, but inanimate, systems.
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10
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Albert PJ, Schwarz US. Modeling cell shape and dynamics on micropatterns. Cell Adh Migr 2016; 10:516-528. [PMID: 26838278 PMCID: PMC5079397 DOI: 10.1080/19336918.2016.1148864] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Accepted: 01/26/2016] [Indexed: 12/29/2022] Open
Abstract
Adhesive micropatterns have become a standard tool to study cells under defined conditions. Applications range from controlling the differentiation and fate of single cells to guiding the collective migration of cell sheets. In long-term experiments, single cell normalization is challenged by cell division. For all of these setups, mathematical models predicting cell shape and dynamics can guide pattern design. Here we review recent advances in predicting and explaining cell shape, traction forces and dynamics on micropatterns. Starting with contour models as the simplest approach to explain concave cell shapes, we move on to network and continuum descriptions as examples for static models. To describe dynamic processes, cellular Potts, vertex and phase field models can be used. Different types of model are appropriate to address different biological questions and together, they provide a versatile tool box to predict cell behavior on micropatterns.
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Affiliation(s)
- Philipp J. Albert
- Institute for Theoretical Physics and BioQuant, Heidelberg University, Heidelberg, Germany
| | - Ulrich S. Schwarz
- Institute for Theoretical Physics and BioQuant, Heidelberg University, Heidelberg, Germany
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11
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Hansen RH, Timm AC, Timm CM, Bible AN, Morrell-Falvey JL, Pelletier DA, Simpson ML, Doktycz MJ, Retterer ST. Stochastic Assembly of Bacteria in Microwell Arrays Reveals the Importance of Confinement in Community Development. PLoS One 2016; 11:e0155080. [PMID: 27152511 PMCID: PMC4859483 DOI: 10.1371/journal.pone.0155080] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 04/24/2016] [Indexed: 12/26/2022] Open
Abstract
The structure and function of microbial communities is deeply influenced by the physical and chemical architecture of the local microenvironment and the abundance of its community members. The complexity of this natural parameter space has made characterization of the key drivers of community development difficult. In order to facilitate these characterizations, we have developed a microwell platform designed to screen microbial growth and interactions across a wide variety of physical and initial conditions. Assembly of microbial communities into microwells was achieved using a novel biofabrication method that exploits well feature sizes for control of innoculum levels. Wells with incrementally smaller size features created populations with increasingly larger variations in inoculum levels. This allowed for reproducible growth measurement in large (20 μm diameter) wells, and screening for favorable growth conditions in small (5, 10 μm diameter) wells. We demonstrate the utility of this approach for screening and discovery using 5 μm wells to assemble P. aeruginosa colonies across a broad distribution of innoculum levels, and identify those conditions that promote the highest probability of survivial and growth under spatial confinement. Multi-member community assembly was also characterized to demonstrate the broad potential of this platform for studying the role of member abundance on microbial competition, mutualism and community succession.
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Affiliation(s)
- Ryan H Hansen
- Kansas State University, Manhattan, Kansas, United States of America.,The University of Tennessee, Knoxville, Tennessee, United States of America
| | - Andrea C Timm
- Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - Collin M Timm
- Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - Amber N Bible
- Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - Jennifer L Morrell-Falvey
- The University of Tennessee, Knoxville, Tennessee, United States of America.,Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - Dale A Pelletier
- Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - Michael L Simpson
- The University of Tennessee, Knoxville, Tennessee, United States of America.,Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - Mitchel J Doktycz
- The University of Tennessee, Knoxville, Tennessee, United States of America.,Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
| | - Scott T Retterer
- The University of Tennessee, Knoxville, Tennessee, United States of America.,Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States of America
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12
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Röttgermann PJF, Dawson KA, Rädler JO. Time-Resolved Study of Nanoparticle Induced Apoptosis Using Microfabricated Single Cell Arrays. ACTA ACUST UNITED AC 2016; 5:microarrays5020008. [PMID: 27600074 PMCID: PMC5003484 DOI: 10.3390/microarrays5020008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 04/01/2016] [Accepted: 04/07/2016] [Indexed: 02/06/2023]
Abstract
Cell fate decisions like apoptosis are heterogeneously implemented within a cell population and, consequently, the population response is recognized as sum of many individual dynamic events. Here, we report on the use of micro-patterned single-cell arrays for real-time tracking of nanoparticle-induced (NP) cell death in sets of thousands of cells in parallel. Annexin (pSIVA) and propidium iodide (PI), two fluorescent indicators of apoptosis, are simultaneously monitored after exposure to functionalized polystyrene (PS - NH 2) nanobeads as a model system. We find that the distribution of Annexin onset times shifts to later times and broadens as a function of decreasing NP dose. We discuss the mean time-to-death as a function of dose, and show how the EC 50 value depends both on dose and time of measurement. In addition, the correlations between the early and late apoptotic markers indicate a systematic shift from apoptotic towards necrotic cell death during the course of the experiment. Thus, our work demonstrates the potential of array-based single cell cytometry for kinetic analysis of signaling cascades in a high-throughput format.
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Affiliation(s)
- Peter J F Röttgermann
- Faculty of Physics and Center for NanoSciene (CeNS), Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 Munich, Germany.
| | - Kenneth A Dawson
- Centre for BioNano Interactions, School of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin 4, Ireland.
| | - Joachim O Rädler
- Faculty of Physics and Center for NanoSciene (CeNS), Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 Munich, Germany.
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13
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14
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Röttgermann PJF, Hertrich S, Berts I, Albert M, Segerer FJ, Moulin JF, Nickel B, Rädler JO. Cell Motility on Polyethylene Glycol Block Copolymers Correlates to Fibronectin Surface Adsorption. Macromol Biosci 2014; 14:1755-63. [DOI: 10.1002/mabi.201400246] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Revised: 08/13/2014] [Indexed: 01/27/2023]
Affiliation(s)
- Peter J. F. Röttgermann
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
| | - Samira Hertrich
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
| | - Ida Berts
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
| | - Max Albert
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
| | - Felix J. Segerer
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
| | - Jean-François Moulin
- Helmholtz Zentrum Geesthacht; Institut für Werkstoffforschung; FRM II; Lichtenbergstr. 1 85747 Garching Germany
| | - Bert Nickel
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
| | - Joachim O. Rädler
- Faculty of Physics and Center for NanoScience (CeNS); Ludwig-Maximilians-University; Geschwister-Scholl-Platz 1 80539 Munich Germany
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15
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Craven GT, Popov AV, Hernandez R. Effective Surface Coverage of Coarse-Grained Soft Matter. J Phys Chem B 2014; 118:14092-102. [DOI: 10.1021/jp505207h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Galen T. Craven
- Center for Computational
Molecular Science and Technology, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Alexander V. Popov
- Center for Computational
Molecular Science and Technology, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Rigoberto Hernandez
- Center for Computational
Molecular Science and Technology, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
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