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Li P, Zhang J. A finite difference method with subsampling for immersed boundary simulations of the capsule dynamics with viscoelastic membranes. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2019; 35:e3200. [PMID: 30884167 DOI: 10.1002/cnm.3200] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Revised: 02/05/2019] [Accepted: 03/09/2019] [Indexed: 06/09/2023]
Abstract
The membrane or interfacial viscosity is an important property in many multiphase and biofluidic situations, such as the red blood cell dynamics and emulsion stability. The immersed boundary method (IBM), which incorporates the dynamic flow-membrane interaction via force distribution and velocity interpolation, has been extensively employed in simulations of such systems. Unfortunately, direct implementation of membrane viscosity in IBM suffers severe numerical instability, which causes an IBM calculation to break down before generating any useful results. Few attempts have been recently reported; however, several concerns exist in these attempts, such as the inconsistency to the classical definition of membrane viscosity, the inability to model the shear and dilatational viscosities separately, the unjustified mathematical formulations, and the complicated algorithms and computation. To overcome these concerns, in this paper, we propose a finite difference approach for implementing membrane viscosity in immersed boundary simulations. The viscous stress is obtained via finite difference approximations to the differential strain-stress relationship, with the help of a subsampling scheme to reduce the numerical noise in the calculated strain rates. This simple method has also avoided the complicated matrix calculations in previous attempts, and hence, a better computational efficiency is expected. Detailed mathematical description of the method and key steps for its implementation in immersed boundary programs are provided. Validation and illustration calculations are performed, and our results are compared with analytical solutions and previous publications with satisfactory agreement. The influences of membrane mesh resolution and simulation time step are also examined; and the results show no indication that our finite difference method has downgraded the general IBM accuracy. Based on these simulations and analysis, we believe that our method would be a better choice for future IBM simulations of capsule dynamics with viscoelastic membranes.
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Affiliation(s)
- Ping Li
- Bharti School of Engineering, Laurentian University, Sudbury, Canada
| | - Junfeng Zhang
- Bharti School of Engineering, Laurentian University, Sudbury, Canada
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Tietze S, Kräter M, Jacobi A, Taubenberger A, Herbig M, Wehner R, Schmitz M, Otto O, List C, Kaya B, Wobus M, Bornhäuser M, Guck J. Spheroid Culture of Mesenchymal Stromal Cells Results in Morphorheological Properties Appropriate for Improved Microcirculation. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2019; 6:1802104. [PMID: 31016116 PMCID: PMC6469243 DOI: 10.1002/advs.201802104] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Revised: 01/21/2019] [Indexed: 05/10/2023]
Abstract
Human bone marrow mesenchymal stromal cells (MSCs) are used in clinical trials for the treatment of systemic inflammatory diseases due to their regenerative and immunomodulatory properties. However, intravenous administration of MSCs is hampered by cell trapping within the pulmonary capillary networks. Here, it is hypothesized that traditional 2D plastic-adherent cell expansion fails to result in appropriate morphorheological properties required for successful cell circulation. To address this issue, a method to culture MSCs in nonadherent 3D spheroids (mesenspheres) is adapted. The biological properties of mesensphere-cultured MSCs remain identical to conventional 2D cultures. However, morphorheological analyses reveal a smaller size and lower stiffness of mesensphere-derived MSCs compared to plastic-adherent MSCs, measured using real-time deformability cytometry and atomic force microscopy. These properties result in an increased ability to pass through microconstrictions in an ex vivo microcirculation assay. This ability is confirmed in vivo by comparison of cell accumulation in various organ capillary networks after intravenous injection of both types of MSCs in mouse. The findings generally identify cellular morphorheological properties as attractive targets for improving microcirculation and specifically suggest mesensphere culture as a promising approach for optimized MSC-based therapies.
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Affiliation(s)
- Stefanie Tietze
- Biotechnology CenterCenter for Molecular and Cellular BioengineeringTU DresdenTatzberg 47‐4901307DresdenGermany
| | - Martin Kräter
- Biotechnology CenterCenter for Molecular and Cellular BioengineeringTU DresdenTatzberg 47‐4901307DresdenGermany
- Max Planck Institute for the Science of Light & Max‐Planck‐Zentrum für Physik und MedizinStaudtstraße 291058ErlangenGermany
| | - Angela Jacobi
- Biotechnology CenterCenter for Molecular and Cellular BioengineeringTU DresdenTatzberg 47‐4901307DresdenGermany
| | - Anna Taubenberger
- Biotechnology CenterCenter for Molecular and Cellular BioengineeringTU DresdenTatzberg 47‐4901307DresdenGermany
| | - Maik Herbig
- Biotechnology CenterCenter for Molecular and Cellular BioengineeringTU DresdenTatzberg 47‐4901307DresdenGermany
| | - Rebekka Wehner
- Institute of ImmunologyMedical Faculty Carl Gustav CarusTU DresdenFetscherstraße 7401307DresdenGermany
| | - Marc Schmitz
- Institute of ImmunologyMedical Faculty Carl Gustav CarusTU DresdenFetscherstraße 7401307DresdenGermany
| | - Oliver Otto
- Biotechnology CenterCenter for Molecular and Cellular BioengineeringTU DresdenTatzberg 47‐4901307DresdenGermany
| | - Catrin List
- Medical Clinic IUniversity Hospital Carl Gustav CarusTU DresdenFetscherstraße 7401307DresdenGermany
| | - Berna Kaya
- Medical Clinic IUniversity Hospital Carl Gustav CarusTU DresdenFetscherstraße 7401307DresdenGermany
| | - Manja Wobus
- Medical Clinic IUniversity Hospital Carl Gustav CarusTU DresdenFetscherstraße 7401307DresdenGermany
| | - Martin Bornhäuser
- Medical Clinic IUniversity Hospital Carl Gustav CarusTU DresdenFetscherstraße 7401307DresdenGermany
| | - Jochen Guck
- Biotechnology CenterCenter for Molecular and Cellular BioengineeringTU DresdenTatzberg 47‐4901307DresdenGermany
- Max Planck Institute for the Science of Light & Max‐Planck‐Zentrum für Physik und MedizinStaudtstraße 291058ErlangenGermany
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53
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Mondésert-Deveraux S, Aubry D, Allena R. In silico approach to quantify nucleus self-deformation on micropillared substrates. Biomech Model Mechanobiol 2019; 18:1281-1295. [PMID: 30941524 DOI: 10.1007/s10237-019-01144-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Accepted: 03/23/2019] [Indexed: 11/29/2022]
Abstract
Considering the major role of confined cell migration in biological processes and diseases, such as embryogenesis or metastatic cancer, it has become increasingly important to design relevant experimental set-ups for in vitro studies. Microfluidic devices have recently presented great opportunities in their respect since they offer the possibility to study all the steps from a suspended to a spread, and eventually crawling cell or a cell with highly deformed nucleus. Here, we focus on the nucleus self-deformation over a micropillared substrate. Actin networks have been observed at two locations in this set-up: above the nucleus, forming the perinuclear actin cap (PAC), and below the nucleus, surrounding the pillars. We can then wonder which of these contractile networks is responsible for nuclear deformation. The cytoplasm and the nucleus are represented through the superposition of a viscous and a hyperelastic material and follow a series of processes. First, the suspended cell settles on the pillars due to gravity. Second, an adhesive spreading force comes into play, and then, active deformations contract one or both actin domains and consequently the nucleus. Our model is first tested on a flat substrate to validate its global behaviour before being confronted to a micropillared substrate. Overall, the nucleus appears to be mostly pulled towards the pillars, while the mechanical action of the PAC is weak. Eventually, we test the influence of gravity and prove that the gravitational force does not play a role in the final deformation of the nucleus.
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Affiliation(s)
- Solenne Mondésert-Deveraux
- Laboratoire MSSMat UMR CNRS 8579, CentraleSupélec, Université Paris-Saclay, 8-10 Rue Joliot Curie, Gif-Sur-Yvette, Paris, France
| | - Denis Aubry
- Laboratoire MSSMat UMR CNRS 8579, CentraleSupélec, Université Paris-Saclay, 8-10 Rue Joliot Curie, Gif-Sur-Yvette, Paris, France
| | - Rachele Allena
- LBM/Institut de Biomécanique Humaine Georges Charpak, Arts et Metiers ParisTech, 151 Boulevard de l'Hôpital, Paris, France.
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54
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Takeishi N, Ito H, Kaneko M, Wada S. Deformation of a Red Blood Cell in a Narrow Rectangular Microchannel. MICROMACHINES 2019; 10:E199. [PMID: 30901883 PMCID: PMC6470855 DOI: 10.3390/mi10030199] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 03/15/2019] [Accepted: 03/16/2019] [Indexed: 01/14/2023]
Abstract
The deformability of a red blood cell (RBC) is one of the most important biological parameters affecting blood flow, both in large arteries and in the microcirculation, and hence it can be used to quantify the cell state. Despite numerous studies on the mechanical properties of RBCs, including cell rigidity, much is still unknown about the relationship between deformability and the configuration of flowing cells, especially in a confined rectangular channel. Recent computer simulation techniques have successfully been used to investigate the detailed behavior of RBCs in a channel, but the dynamics of a translating RBC in a narrow rectangular microchannel have not yet been fully understood. In this study, we numerically investigated the behavior of RBCs flowing at different velocities in a narrow rectangular microchannel that mimicked a microfluidic device. The problem is characterized by the capillary number C a , which is the ratio between the fluid viscous force and the membrane elastic force. We found that confined RBCs in a narrow rectangular microchannel maintained a nearly unchanged biconcave shape at low C a , then assumed an asymmetrical slipper shape at moderate C a , and finally attained a symmetrical parachute shape at high C a . Once a RBC deformed into one of these shapes, it was maintained as the final stable configurations. Since the slipper shape was only found at moderate C a , measuring configurations of flowing cells will be helpful to quantify the cell state.
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Affiliation(s)
- Naoki Takeishi
- Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan.
| | - Hiroaki Ito
- Department of Mechanical Engineering, Osaka University, Suita, Osaka 565-0871, Japan.
- Department of Physics, Graduate School of Science, Chiba University, Chiba 263-8522, Japan.
| | - Makoto Kaneko
- Department of Mechanical Engineering, Osaka University, Suita, Osaka 565-0871, Japan.
| | - Shigeo Wada
- Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan.
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55
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Villone MM, Nunes JK, Li Y, Stone HA, Maffettone PL. Design of a microfluidic device for the measurement of the elastic modulus of deformable particles. SOFT MATTER 2019; 15:880-889. [PMID: 30601566 DOI: 10.1039/c8sm02272k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A microfluidic technique recently proposed in the literature to measure the interfacial tension between a liquid droplet and an immiscible suspending liquid [Hudson et al., Appl. Phys. Lett., 2005, 87, 081905], [Cabral and Hudson, Lab Chip, 2006, 6, 427] is suitably adapted to the characterization of the elastic modulus of soft particles in a continuous-flow process. A microfluidic device consisting of a cylindrical pipe with a reduction in cross-section is designed, and the deformation and velocity of incompressible elastic particles suspended in a Newtonian liquid are tracked as they move along the centerline through the constriction. Kinematic and shape information is exploited to calculate the particle's elastic modulus by means of the theory of elastic particle deformation in extensional flow. The approach is validated for different orders of magnitude of the elastic capillary number through experiments and numerical simulations.
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Affiliation(s)
- Massimiliano M Villone
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università di Napoli Federico II, P. le Tecchio 80, 80125 Napoli, Italy.
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56
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Leblanc-Hotte A, Sen Nkwe N, Chabot-Roy G, Affar EB, Lesage S, Delisle JS, Peter YA. On-chip refractive index cytometry for whole-cell deformability discrimination. LAB ON A CHIP 2019; 19:464-474. [PMID: 30570636 DOI: 10.1039/c8lc00938d] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
On-chip high-throughput phenotyping of single cells has gained a lot of interest recently due to the discrimination capability of label-free biomarkers such as whole-cell deformability and refractive index. Here we present on-chip refractive index cytometry (RIC) for whole-cell deformability at a high measurement rate. We have further exploited a previously published on-chip optical characterization method which enhances cellular discrimination through the refractive index measurement of single cells. The proposed on-chip RIC can simultaneously probe the cellular refractive index, effective volume and whole-cell deformability while reaching a measurement rate up to 5000 cells per second. Additionally, the relative position of the nucleus inside the cell is reflected by the asymmetry of the measured curve. This particular finding is confirmed by our numerical simulation model and emphasized by a modified cytoskeleton HL-60 cells model. Furthermore, the proposed device discriminated HL-60 derived myeloid cells such as neutrophils, basophils and promyelocytes, which are indistinguishable using flow cytometry. To our knowledge, this is the first integrated device to simultaneously characterize the cellular refractive index and whole-cell deformability, yielding enhanced discrimination of large myeloid cell populations.
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Affiliation(s)
- Antoine Leblanc-Hotte
- Department of Engineering Physics, Polytechnique Montreal, Montreal, QC H3T 1J4, Canada.
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57
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Fregin B, Czerwinski F, Biedenweg D, Girardo S, Gross S, Aurich K, Otto O. High-throughput single-cell rheology in complex samples by dynamic real-time deformability cytometry. Nat Commun 2019; 10:415. [PMID: 30679420 PMCID: PMC6346011 DOI: 10.1038/s41467-019-08370-3] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Accepted: 01/08/2019] [Indexed: 11/25/2022] Open
Abstract
In life sciences, the material properties of suspended cells have attained significance close to that of fluorescent markers but with the advantage of label-free and unbiased sample characterization. Until recently, cell rheological measurements were either limited by acquisition throughput, excessive post processing, or low-throughput real-time analysis. Real-time deformability cytometry expanded the application of mechanical cell assays to fast on-the-fly phenotyping of large sample sizes, but has been restricted to single material parameters as the Young's modulus. Here, we introduce dynamic real-time deformability cytometry for comprehensive cell rheological measurements at up to 100 cells per second. Utilizing Fourier decomposition, our microfluidic method is able to disentangle cell response to complex hydrodynamic stress distributions and to determine viscoelastic parameters independent of cell shape. We demonstrate the application of our technology for peripheral blood cells in whole blood samples including the discrimination of B- and CD4+ T-lymphocytes by cell rheological properties.
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Affiliation(s)
- Bob Fregin
- Zentrum für Innovationskompetenz: Humorale Immunreaktionen bei kardiovaskulären Erkrankungen, Universität Greifswald, Fleischmannstr. 42, 17489, Greifswald, Germany
| | - Fabian Czerwinski
- Zentrum für Innovationskompetenz: Humorale Immunreaktionen bei kardiovaskulären Erkrankungen, Universität Greifswald, Fleischmannstr. 42, 17489, Greifswald, Germany
| | - Doreen Biedenweg
- Universitätsmedizin Greifswald, Fleischmannstr. 8, 17489, Greifswald, Germany
| | - Salvatore Girardo
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Tatzberg 47/49, 01307, Dresden, Germany
| | - Stefan Gross
- Universitätsmedizin Greifswald, Fleischmannstr. 8, 17489, Greifswald, Germany
- Deutsches Zentrum für Herz-Kreislauf-Forschung e.V., Standort Greifswald, Universitätsmedizin Greifswald, Fleischmannstr. 42, 17489, Greifswald, Germany
| | - Konstanze Aurich
- Universitätsmedizin Greifswald, Fleischmannstr. 8, 17489, Greifswald, Germany
| | - Oliver Otto
- Zentrum für Innovationskompetenz: Humorale Immunreaktionen bei kardiovaskulären Erkrankungen, Universität Greifswald, Fleischmannstr. 42, 17489, Greifswald, Germany.
- Deutsches Zentrum für Herz-Kreislauf-Forschung e.V., Standort Greifswald, Universitätsmedizin Greifswald, Fleischmannstr. 42, 17489, Greifswald, Germany.
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58
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Analysis of Biomechanical Properties of Hematopoietic Stem and Progenitor Cells Using Real-Time Fluorescence and Deformability Cytometry. Methods Mol Biol 2019; 2017:135-148. [PMID: 31197774 DOI: 10.1007/978-1-4939-9574-5_11] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Stem cell mechanics, determined predominantly by the cell's cytoskeleton, plays an important role in different biological processes such as stem cell differentiation or migration. Several methods to measure mechanical properties of cells are currently available, but most of them are limited in the ability to screen large heterogeneous populations in a robust and efficient manner-a feature required for successful translational applications. With real-time fluorescence and deformability cytometry (RT-FDC), mechanical properties of cells in suspension can be screened continuously at rates of up to 1,000 cells/s-similar to conventional flow cytometers-which makes it a suitable method not only for basic research but also for a clinical setting. In parallel to mechanical characterization, RT-FDC allows to measure specific molecular markers using standard fluorescence labeling. In this chapter, we provide a detailed protocol for the characterization of hematopoietic stem and progenitor cells (HSPCs) in heterogeneous mobilized peripheral blood using RT-FDC and present a specific morpho-rheological fingerprint of HSPCs that allows to distinguish them from all other blood cell types.
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59
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Affiliation(s)
- Daniel Stoecklein
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Dino Di Carlo
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, California 90095, United States
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60
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Buchholz I, Nestler P, Köppen S, Delcea M. Lysine residues control the conformational dynamics of beta 2-glycoprotein I. Phys Chem Chem Phys 2018; 20:26819-26829. [PMID: 30176030 DOI: 10.1039/c8cp03234c] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
One of the major problems in the study of the dynamics of proteins is the visualization of changing conformations that are important for processes ranging from enzyme catalysis to signaling. A protein exhibiting conformational dynamics is the soluble blood protein beta 2-glycoprotein I (beta2GPI), which exists in two conformations: the closed (circular) form and the open (linear) form. It is hypothesized that an increased proportion of the open conformation leads to the autoimmune disease antiphospholipid syndrome (APS). A characteristic feature of beta2GPI is the high content of lysine residues. However, the potential role of lysine in the conformational dynamics of beta2GPI has been poorly investigated. Here, we report on a strategy to permanently open up the closed protein conformation by chemical acetylation of lysine residues using acetic acid N-hydroxysuccinimide ester (NHS-Ac). Specific and complete acetylation was demonstrated by the quantification of primary amino groups with fluoraldehyde o-phthalaldehyde (OPA) reagent, as well as western blot analysis with an anti-acetylated lysine antibody. Our results demonstrate that acetylated beta2GPI preserves its secondary and tertiary structures, as shown by circular dichroism spectroscopy. We found that after lysine acetylation, the majority of proteins are in the open conformation as revealed by atomic force microscopy high-resolution images. Using this strategy, we proved that the electrostatic interaction of lysine residues plays a major role in stabilizing the beta2GPI closed conformation, as confirmed by lysine charge distribution calculations. We foresee that our approach will be applied to other lysine-rich proteins (e.g. histones) undergoing conformational transitions. For instance, conformational dynamics can be triggered by environmental conditions (e.g. pH, ion concentration, post-translational modifications, and binding of ligands). Therefore, our study may be relevant for investigating the equilibrium of protein conformations causing diseases.
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Affiliation(s)
- Ina Buchholz
- Institute of Biochemistry, Ernst-Moritz-Arndt University Greifswald, 17489 Greifswald, Germany.
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61
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Wullkopf L, West AKV, Leijnse N, Cox TR, Madsen CD, Oddershede LB, Erler JT. Cancer cells' ability to mechanically adjust to extracellular matrix stiffness correlates with their invasive potential. Mol Biol Cell 2018; 29:2378-2385. [PMID: 30091653 PMCID: PMC6233061 DOI: 10.1091/mbc.e18-05-0319] [Citation(s) in RCA: 132] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 07/24/2018] [Accepted: 07/31/2018] [Indexed: 12/19/2022] Open
Abstract
Increased tissue stiffness is a classic characteristic of solid tumors. One of the major contributing factors is increased density of collagen fibers in the extracellular matrix (ECM). Here, we investigate how cancer cells biomechanically interact with and respond to the stiffness of the ECM. Probing the adaptability of cancer cells to altered ECM stiffness using optical tweezers-based microrheology and deformability cytometry, we find that only malignant cancer cells have the ability to adjust to collagen matrices of different densities. Employing microrheology on the biologically relevant spheroid invasion assay, we can furthermore demonstrate that, even within a cluster of cells of similar origin, there are differences in the intracellular biomechanical properties dependent on the cells' invasive behavior. We reveal a consistent increase of viscosity in cancer cells leading the invasion into the collagen matrices in comparison with cancer cells following in the stalk or remaining in the center of the spheroid. We hypothesize that this differential viscoelasticity might facilitate spheroid tip invasion through a dense matrix. These findings highlight the importance of the biomechanical interplay between cells and their microenvironment for tumor progression.
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Affiliation(s)
- Lena Wullkopf
- Biotech Research and Innovation Centre (BRIC), University of Copenhagen, 2200 Copenhagen, Denmark
- Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
| | | | - Natascha Leijnse
- Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Thomas R. Cox
- Biotech Research and Innovation Centre (BRIC), University of Copenhagen, 2200 Copenhagen, Denmark
- Garvan Institute of Medical Research and the Kinghorn Cancer Centre, Cancer Division, St Vincent’s Clinical School, Faculty of Medicine, University of New South Wales, Sydney, NSW 2010, Australia
| | - Chris D. Madsen
- Biotech Research and Innovation Centre (BRIC), University of Copenhagen, 2200 Copenhagen, Denmark
- Department of Laboratory Medicine, Division of Translational Cancer Research, Lund University, 223 81 Lund, Sweden
| | - Lene B. Oddershede
- Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Janine T. Erler
- Biotech Research and Innovation Centre (BRIC), University of Copenhagen, 2200 Copenhagen, Denmark
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62
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Girardo S, Träber N, Wagner K, Cojoc G, Herold C, Goswami R, Schlüßler R, Abuhattum S, Taubenberger A, Reichel F, Mokbel D, Herbig M, Schürmann M, Müller P, Heida T, Jacobi A, Ulbricht E, Thiele J, Werner C, Guck J. Standardized microgel beads as elastic cell mechanical probes. J Mater Chem B 2018; 6:6245-6261. [PMID: 32254615 DOI: 10.1039/c8tb01421c] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Cell mechanical measurements are gaining increasing interest in biological and biomedical studies. However, there are no standardized calibration particles available that permit the cross-comparison of different measurement techniques operating at different stresses and time-scales. Here we present the rational design, production, and comprehensive characterization of poly-acrylamide (PAAm) microgel beads mimicking size and overall mechanics of biological cells. We produced mono-disperse beads at rates of 20-60 kHz by means of a microfluidic droplet generator, where the pre-gel composition was adjusted to tune the beads' elasticity in the range of cell and tissue relevant mechanical properties. We verified bead homogeneity by optical diffraction tomography and Brillouin microscopy. Consistent elastic behavior of microgel beads at different shear rates was confirmed by AFM-enabled nanoindentation and real-time deformability cytometry (RT-DC). The remaining inherent variability in elastic modulus was rationalized using polymer theory and effectively reduced by sorting based on forward-scattering using conventional flow cytometry. Our results show that PAAm microgel beads can be standardized as mechanical probes, to serve not only for validation and calibration of cell mechanical measurements, but also as cell-scale stress sensors.
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Affiliation(s)
- S Girardo
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Tatzberg 47/49, 01307 Dresden, Germany.
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63
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Kräter M, Sapudom J, Bilz NC, Pompe T, Guck J, Claus C. Alterations in Cell Mechanics by Actin Cytoskeletal Changes Correlate with Strain-Specific Rubella Virus Phenotypes for Cell Migration and Induction of Apoptosis. Cells 2018; 7:E136. [PMID: 30217036 PMCID: PMC6162683 DOI: 10.3390/cells7090136] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 09/07/2018] [Accepted: 09/10/2018] [Indexed: 02/06/2023] Open
Abstract
The cellular cytoskeleton is central for key cellular functions, and as such is a marker for diseased and infected cell states. Here we analyzed infection with rubella virus (RV) strains with respect to phenotypes in cellular mechanical properties, cell movement, and viral cytopathogenicity. Real-time deformability cytometry (RT-DC), as a high-throughput platform for the assessment of cell mechanics, revealed a correlation of an increase in cortical filamentous-actin (F-actin) with a higher cellular stiffness. The additional reduction of stress fibers noted for only some RV strains as the most severe actin rearrangement lowered cell stiffness. Furthermore, a reduced collective and single cell migration speed in a wound healing assay was detected in addition to severe changes in cell morphology. The latter was followed by activation of caspase 3/7 as a sign for induction of apoptosis. Our study emphasizes RT-DC technology as a sensitive means to characterize viral cell populations and to implicate alterations of cell mechanical properties with cell functions. These interdependent events are not only promising options to elucidate viral spread and to understand viral pathologies within the infected host. They also contribute to any diseased cell state, as exemplified by RV as a representative agent for cytoskeletal alterations involved in a cytopathological outcome.
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Affiliation(s)
- Martin Kräter
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, 01307 Dresden, Germany.
| | - Jiranuwat Sapudom
- Institute of Biochemistry, Leipzig University, 04103 Leipzig, Germany.
- Department of Dermatology, Venerology and Allergology, University Clinic of Leipzig, 04103 Leipzig, Germany.
| | | | - Tilo Pompe
- Institute of Biochemistry, Leipzig University, 04103 Leipzig, Germany.
| | - Jochen Guck
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, 01307 Dresden, Germany.
| | - Claudia Claus
- Institute of Virology, University of Leipzig, 04103 Leipzig, Germany.
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64
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Campbell JM, Balhoff JB, Landwehr GM, Rahman SM, Vaithiyanathan M, Melvin AT. Microfluidic and Paper-Based Devices for Disease Detection and Diagnostic Research. Int J Mol Sci 2018; 19:E2731. [PMID: 30213089 PMCID: PMC6164778 DOI: 10.3390/ijms19092731] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 09/05/2018] [Accepted: 09/06/2018] [Indexed: 12/12/2022] Open
Abstract
Recent developments in microfluidic devices, nanoparticle chemistry, fluorescent microscopy, and biochemical techniques such as genetic identification and antibody capture have provided easier and more sensitive platforms for detecting and diagnosing diseases as well as providing new fundamental insight into disease progression. These advancements have led to the development of new technology and assays capable of easy and early detection of pathogenicity as well as the enhancement of the drug discovery and development pipeline. While some studies have focused on treatment, many of these technologies have found initial success in laboratories as a precursor for clinical applications. This review highlights the current and future progress of microfluidic techniques geared toward the timely and inexpensive diagnosis of disease including technologies aimed at high-throughput single cell analysis for drug development. It also summarizes novel microfluidic approaches to characterize fundamental cellular behavior and heterogeneity.
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Affiliation(s)
- Joshua M Campbell
- Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA.
| | - Joseph B Balhoff
- Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA.
| | - Grant M Landwehr
- Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA.
| | - Sharif M Rahman
- Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA.
| | | | - Adam T Melvin
- Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA.
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65
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Liu A, Islam M, Stone N, Varadarajan V, Jeong J, Bowie S, Qiu P, Waller EK, Alexeev A, Sulchek T. Microfluidic generation of transient cell volume exchange for convectively driven intracellular delivery of large macromolecules. MATERIALS TODAY (KIDLINGTON, ENGLAND) 2018; 21:703-712. [PMID: 30288138 PMCID: PMC6166476 DOI: 10.1016/j.mattod.2018.03.002] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
Efficient intracellular delivery of target macromolecules remains a major obstacle in cell engineering and other biomedical applications. We discovered a unique cell biophysical phenomenon of transient cell volume exchange by using microfluidics to rapidly and repeatedly compress cells. This behavior consists of brief, mechanically induced cell volume loss followed by rapid volume recovery. We harness this behavior for high-throughput, convective intracellular delivery of large polysaccharides (2000 kDa), particles (100 nm), and plasmids while maintaining high cell viability. Successful proof of concept experiments in transfection and intracellular labeling demonstrated potential to overcome the most prohibitive challenges in intracellular delivery for cell engineering.
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Affiliation(s)
- Anna Liu
- Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Muhymin Islam
- School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Nicholas Stone
- School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Vikram Varadarajan
- Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Jenny Jeong
- Department of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Sam Bowie
- School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Peng Qiu
- Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Edmund K Waller
- Department of Hematology and Medical Oncology, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Alexander Alexeev
- School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Todd Sulchek
- Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
- School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
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66
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Urbanska M, Rosendahl P, Kräter M, Guck J. High-throughput single-cell mechanical phenotyping with real-time deformability cytometry. Methods Cell Biol 2018; 147:175-198. [PMID: 30165957 DOI: 10.1016/bs.mcb.2018.06.009] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Mechanical properties of cells can serve as a label-free marker of cell state and function and their alterations have been implicated in processes such as cancer metastasis, leukocyte activation, or stem cell differentiation. Over recent years, new techniques for single-cell mechanical characterization at high throughput have been developed to accelerate discovery in the field of mechanical phenotyping. One such technique is real-time deformability cytometry (RT-DC), a robust technology based on microfluidics that performs continuous mechanical characterization of cells in a contactless manner at rates of up to 1000 cells per second. This tremendous throughput allows for comparison of large sample numbers and precise characterization of heterogeneous cell populations. Additionally, parameters acquired in RT-DC measurements can be used to determine the apparent Young's modulus of individual cells. In this chapter, we present practical aspects important for the implementation of the RT-DC methodology, including a description of the setup, operation principles, and experimental protocols. In the latter, we describe a variety of preparation procedures for samples originating from different sources including 2D and 3D cell cultures as well as blood and tissue-derived primary cells, and discuss obstacles that may arise during their measurements. Finally, we provide insights into standard data analysis procedures and discuss the method's performance in light of other available techniques.
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Affiliation(s)
- Marta Urbanska
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany
| | - Philipp Rosendahl
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany
| | - Martin Kräter
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany
| | - Jochen Guck
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany.
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67
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Herbig M, Mietke A, Müller P, Otto O. Statistics for real-time deformability cytometry: Clustering, dimensionality reduction, and significance testing. BIOMICROFLUIDICS 2018; 12:042214. [PMID: 29937952 PMCID: PMC5999349 DOI: 10.1063/1.5027197] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 05/21/2018] [Indexed: 06/08/2023]
Abstract
Real-time deformability (RT-DC) is a method for high-throughput mechanical and morphological phenotyping of cells in suspension. While analysis rates exceeding 1000 cells per second allow for a label-free characterization of complex biological samples, e.g., whole blood, data evaluation has so far been limited to a few geometrical and material parameters such as cell size, deformation, and elastic Young's modulus. But as a microscopy-based technology, RT-DC actually generates and yields multidimensional datasets that require automated and unbiased tools to obtain morphological and rheological cell information. Here, we present a statistical framework to shed light on this complex parameter space and to extract quantitative results under various experimental conditions. As model systems, we apply cell lines as well as primary cells and highlight more than 11 parameters that can be obtained from RT-DC data. These parameters are used to identify sub-populations in heterogeneous samples using Gaussian mixture models, to perform a dimensionality reduction using principal component analysis, and to quantify the statistical significance applying linear mixed models to datasets of multiple replicates.
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Affiliation(s)
- M. Herbig
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, 01307 Dresden, Germany
| | | | - P. Müller
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, 01307 Dresden, Germany
| | - O. Otto
- Author to whom the correspondence should be addressed:
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68
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Rosendahl P, Plak K, Jacobi A, Kraeter M, Toepfner N, Otto O, Herold C, Winzi M, Herbig M, Ge Y, Girardo S, Wagner K, Baum B, Guck J. Real-time fluorescence and deformability cytometry. Nat Methods 2018; 15:355-358. [PMID: 29608556 DOI: 10.1038/nmeth.4639] [Citation(s) in RCA: 91] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Accepted: 02/27/2018] [Indexed: 12/22/2022]
Abstract
The throughput of cell mechanical characterization has recently approached that of conventional flow cytometers. However, this very sensitive, label-free approach still lacks the specificity of molecular markers. Here we developed an approach that combines real-time 1D-imaging fluorescence and deformability cytometry in one instrument (RT-FDC), thus opening many new research avenues. We demonstrated its utility by using subcellular fluorescence localization to identify mitotic cells and test for mechanical changes in those cells in an RNA interference screen.
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Affiliation(s)
- Philipp Rosendahl
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany
| | - Katarzyna Plak
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany
- MRC Laboratory for Molecular and Cellular Biology, University College London, London, UK
| | - Angela Jacobi
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany
| | - Martin Kraeter
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany
- Medical Clinic I, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Nicole Toepfner
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany
- Department of Pediatrics, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Oliver Otto
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany
| | - Christoph Herold
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany
| | - Maria Winzi
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany
| | - Maik Herbig
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany
| | - Yan Ge
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany
| | - Salvatore Girardo
- Microstructure Facility, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany
| | - Katrin Wagner
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany
| | - Buzz Baum
- MRC Laboratory for Molecular and Cellular Biology, University College London, London, UK
| | - Jochen Guck
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany
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69
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Toepfner N, Herold C, Otto O, Rosendahl P, Jacobi A, Kräter M, Stächele J, Menschner L, Herbig M, Ciuffreda L, Ranford-Cartwright L, Grzybek M, Coskun Ü, Reithuber E, Garriss G, Mellroth P, Henriques-Normark B, Tregay N, Suttorp M, Bornhäuser M, Chilvers ER, Berner R, Guck J. Detection of human disease conditions by single-cell morpho-rheological phenotyping of blood. eLife 2018; 7:e29213. [PMID: 29331015 PMCID: PMC5790376 DOI: 10.7554/elife.29213] [Citation(s) in RCA: 90] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Accepted: 01/03/2018] [Indexed: 12/27/2022] Open
Abstract
Blood is arguably the most important bodily fluid and its analysis provides crucial health status information. A first routine measure to narrow down diagnosis in clinical practice is the differential blood count, determining the frequency of all major blood cells. What is lacking to advance initial blood diagnostics is an unbiased and quick functional assessment of blood that can narrow down the diagnosis and generate specific hypotheses. To address this need, we introduce the continuous, cell-by-cell morpho-rheological (MORE) analysis of diluted whole blood, without labeling, enrichment or separation, at rates of 1000 cells/sec. In a drop of blood we can identify all major blood cells and characterize their pathological changes in several disease conditions in vitro and in patient samples. This approach takes previous results of mechanical studies on specifically isolated blood cells to the level of application directly in blood and adds a functional dimension to conventional blood analysis.
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Affiliation(s)
- Nicole Toepfner
- Center of Molecular and Cellular Bioengineering, Biotechnology CenterTechnische Universität DresdenDresdenGermany
- Department of MedicineUniversity of CambridgeCambridgeUnited Kingdom
- Department of PediatricsUniversity Clinic Carl Gustav Carus, Technische Universität DresdenDresdenGermany
| | - Christoph Herold
- Center of Molecular and Cellular Bioengineering, Biotechnology CenterTechnische Universität DresdenDresdenGermany
- Zellmechanik Dresden GmbHDresdenGermany
| | - Oliver Otto
- Center of Molecular and Cellular Bioengineering, Biotechnology CenterTechnische Universität DresdenDresdenGermany
- Zellmechanik Dresden GmbHDresdenGermany
- ZIK HIKE, Universität GreifswaldGreifswaldGermany
| | - Philipp Rosendahl
- Center of Molecular and Cellular Bioengineering, Biotechnology CenterTechnische Universität DresdenDresdenGermany
- Zellmechanik Dresden GmbHDresdenGermany
| | - Angela Jacobi
- Center of Molecular and Cellular Bioengineering, Biotechnology CenterTechnische Universität DresdenDresdenGermany
| | - Martin Kräter
- Department of Hematology and OncologyUniversity Clinic Carl Gustav Carus, Technische Universität DresdenDresdenGermany
| | - Julia Stächele
- Department of PediatricsUniversity Clinic Carl Gustav Carus, Technische Universität DresdenDresdenGermany
| | - Leonhard Menschner
- Department of PediatricsUniversity Clinic Carl Gustav Carus, Technische Universität DresdenDresdenGermany
| | - Maik Herbig
- Center of Molecular and Cellular Bioengineering, Biotechnology CenterTechnische Universität DresdenDresdenGermany
| | - Laura Ciuffreda
- Institute of Infection, Immunity and InflammationUniversity of GlasgowGlasgowUnited Kingdom
| | | | - Michal Grzybek
- Paul Langerhans Institute Dresden of the Helmholtz Centre MunichUniversity Hospital and Faculty of Medicine Carl Gustav Carus, Technische Universität DresdenDresdenGermany
- German Center for Diabetes ResearchNeuherbergGermany
| | - Ünal Coskun
- Paul Langerhans Institute Dresden of the Helmholtz Centre MunichUniversity Hospital and Faculty of Medicine Carl Gustav Carus, Technische Universität DresdenDresdenGermany
- German Center for Diabetes ResearchNeuherbergGermany
| | - Elisabeth Reithuber
- Department of Microbiology, Tumor and Cell BiologyKarolinska InstitutetStockholmSweden
- Department of Clinical MicrobiologyKarolinska University HospitalStockholmSweden
| | - Geneviève Garriss
- Department of Microbiology, Tumor and Cell BiologyKarolinska InstitutetStockholmSweden
- Department of Clinical MicrobiologyKarolinska University HospitalStockholmSweden
| | - Peter Mellroth
- Department of Microbiology, Tumor and Cell BiologyKarolinska InstitutetStockholmSweden
- Department of Clinical MicrobiologyKarolinska University HospitalStockholmSweden
| | - Birgitta Henriques-Normark
- Department of Microbiology, Tumor and Cell BiologyKarolinska InstitutetStockholmSweden
- Department of Clinical MicrobiologyKarolinska University HospitalStockholmSweden
| | - Nicola Tregay
- Department of MedicineUniversity of CambridgeCambridgeUnited Kingdom
| | - Meinolf Suttorp
- Department of PediatricsUniversity Clinic Carl Gustav Carus, Technische Universität DresdenDresdenGermany
| | - Martin Bornhäuser
- Department of Hematology and OncologyUniversity Clinic Carl Gustav Carus, Technische Universität DresdenDresdenGermany
| | - Edwin R Chilvers
- Department of MedicineUniversity of CambridgeCambridgeUnited Kingdom
| | - Reinhard Berner
- Department of PediatricsUniversity Clinic Carl Gustav Carus, Technische Universität DresdenDresdenGermany
| | - Jochen Guck
- Center of Molecular and Cellular Bioengineering, Biotechnology CenterTechnische Universität DresdenDresdenGermany
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70
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Abstract
Real-time deformability cytometry (RT-DC) is a microfluidic technique that allows to capture and evaluate morphology and rheology of up to 1000 cells/s in a constricted channel. The cells are deformed without mechanical contact by hydrodynamic forces and are quantified in real-time without the need of additional handling or staining procedures. Segmented pictures of the cells are stored and can be used for further analysis. RT-DC is sensitive to alterations of the cytoskeleton, which allows, e.g., to show differences in cell cycle phases, identify different subpopulations in whole blood and to study mechanical stiffening of cells entering a dormant state. The abundance of the obtainable parameters and the interpretation as mechanical readout is an analytical challenge that needs standardization. Here, we will provide guidelines for measuring and post-processing of RT-DC data.
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71
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Sibbitts J, Sellens KA, Jia S, Klasner SA, Culbertson CT. Cellular Analysis Using Microfluidics. Anal Chem 2017; 90:65-85. [DOI: 10.1021/acs.analchem.7b04519] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Jay Sibbitts
- Department
of Chemistry, Kansas State University, Manhattan, Kansas 66506, United States
| | - Kathleen A. Sellens
- Department
of Chemistry, Kansas State University, Manhattan, Kansas 66506, United States
| | - Shu Jia
- Department
of Chemistry, Kansas State University, Manhattan, Kansas 66506, United States
| | - Scott A. Klasner
- 12966
South
State Highway 94, Marthasville, Missouri 63357, United States
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72
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Urbanska M, Winzi M, Neumann K, Abuhattum S, Rosendahl P, Müller P, Taubenberger A, Anastassiadis K, Guck J. Single-cell mechanical phenotype is an intrinsic marker of reprogramming and differentiation along the mouse neural lineage. Development 2017; 144:4313-4321. [DOI: 10.1242/dev.155218] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Accepted: 10/24/2017] [Indexed: 12/18/2022]
Abstract
Cellular reprogramming is a dedifferentiation process during which cells continuously undergo phenotypical remodeling. Although the genetic and biochemical details of this remodeling are fairly well understood, little is known about the change in cell mechanical properties during the process. In this study, we investigated changes in the mechanical phenotype of murine fetal neural progenitor cells (fNPCs) during reprogramming to induced pluripotent stem cells (iPSCs). We find that fNPCs become progressively stiffer en route to pluripotency, and that this stiffening is mirrored by iPSCs becoming more compliant during differentiation towards the neural lineage. Furthermore, we show that the mechanical phenotype of iPSCs is comparable with that of embryonic stem cells. These results suggest that mechanical properties of cells are inherent to their developmental stage. They also reveal that pluripotent cells can differentiate towards a more compliant phenotype, which challenges the view that pluripotent stem cells are less stiff than any cells more advanced developmentally. Finally, our study indicates that the cell mechanical phenotype might be utilized as an inherent biophysical marker of pluripotent stem cells.
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Affiliation(s)
- Marta Urbanska
- Cellular Machines, Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Tatzberg 47-49, Dresden 01307, Germany
| | - Maria Winzi
- Cellular Machines, Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Tatzberg 47-49, Dresden 01307, Germany
| | - Katrin Neumann
- Stem Cell Engineering, Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Tatzberg 47-49, Dresden 01307, Germany
| | - Shada Abuhattum
- Cellular Machines, Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Tatzberg 47-49, Dresden 01307, Germany
- JPK Instruments AG, Colditzstraße 34-36, Berlin 12099, Germany
| | - Philipp Rosendahl
- Cellular Machines, Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Tatzberg 47-49, Dresden 01307, Germany
| | - Paul Müller
- Cellular Machines, Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Tatzberg 47-49, Dresden 01307, Germany
| | - Anna Taubenberger
- Cellular Machines, Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Tatzberg 47-49, Dresden 01307, Germany
| | - Konstantinos Anastassiadis
- Stem Cell Engineering, Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Tatzberg 47-49, Dresden 01307, Germany
| | - Jochen Guck
- Cellular Machines, Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Tatzberg 47-49, Dresden 01307, Germany
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73
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Genin GM, Shenoy VB, Peng G, Buehler MJ. Integrated Multiscale Biomaterials Experiment and Modeling. ACS Biomater Sci Eng 2017; 3:2628-2632. [PMID: 31157296 PMCID: PMC6544164 DOI: 10.1021/acsbiomaterials.7b00821] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The integration of modeling and experimentation is an integral component of all engineering design. Developing the technologies to achieve this represents a critical challenge in biomaterials because of the hierarchical structures that comprise them and the spectra of timescales upon which they operate. Progress in integrating modeling and experiment in biomaterials represents progress towards harnessing them for engineering application. We present here a summary of the state of the art, and outlooks for the field as a whole.
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Affiliation(s)
- Guy M Genin
- Department of Mechanical Engineering and Materials Science, 1 Brookings Drive, Washington University in St. Louis, St. Louis, MO 63130 United States
- NSF Science and Technology Center for Engineering Mechanobiology, 1 Brookings Drive, Washington University in St. Louis, St. Louis, MO 63130 United States
| | - Vivek B Shenoy
- Department of Materials Science and Engineering, University of Pennsylvania, 220 South 33rd Street, Philadelphia, PA 19104-6391 United States
- NSF Science and Technology Center for Engineering Mechanobiology, University of Pennsylvania, 220 South 33rd Street, Philadelphia, PA 19104-6391 United States
| | - Grace Peng
- National Institute of Biomedical Imaging and Bioengineering, 6707 Democracy Boulevard, Suite 202, Bethesda, MD 20892-5469 United States
| | - Markus J Buehler
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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74
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Raj A, Dixit M, Doble M, Sen AK. A combined experimental and theoretical approach towards mechanophenotyping of biological cells using a constricted microchannel. LAB ON A CHIP 2017; 17:3704-3716. [PMID: 28983550 DOI: 10.1039/c7lc00599g] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
We report a combined experimental and theoretical technique that enables the characterization of various mechanical properties of biological cells. The cells were infused into a microfluidic device that comprises multiple parallel micro-constrictions to eliminate device clogging and facilitate characterization of cells of different sizes and types on a single device. The extension ratio λ and transit velocity Uc of the cells were measured using high-speed and high-resolution imaging which were then used in a theoretical model to predict the Young's modulus Ec = f(λ, Uc) of the cells. The predicted Young's modulus Ec values for three different cell lines (182 ± 34.74 Pa for MDA MB 231, 360 ± 75 Pa for MCF 10A and, 763 ± 93 Pa for HeLa) compare well with those reported in the literature from micropipette measurements and atomic force microscopy measurement within 10% and 15%, respectively. Also, the Young's modulus of MDA-MB-231 cells treated with 50 μM 4-hyrdroxyacetophenone (for localization of myosin II) for 30 min was found out to be 260 ± 52 Pa. The entry time te of cells into the micro-constrictions was predicted using the model and validated using experimentally measured data. The entry and transit behaviors of cells in the micro-constriction including cell deformation (extension ratio λ) and velocity Uc were experimentally measured and used to predict various cell properties such as the Young's modulus, cytoplasmic viscosity and induced hydrodynamic resistance of different types of cells. The proposed combined experimental and theoretical approach leads to a new paradigm for mechanophenotyping of biological cells.
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Affiliation(s)
- A Raj
- Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai-600036, India.
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75
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Hansen CE, Lam WA. Clinical Implications of Single-Cell Microfluidic Devices for Hematological Disorders. Anal Chem 2017; 89:11881-11892. [PMID: 28942646 DOI: 10.1021/acs.analchem.7b01013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Single-cell microfluidic devices are poised to substantially impact the hematology field by providing a high-throughput and rapid device to analyze disease-mediated biophysical cellular changes in the clinical setting in order to diagnose patients and monitor disease prognosis. In this Feature, we cover recent advances of single-cell microfluidic devices for studying and diagnosing hematological dysfunctions and the clinical impact made possible by these advances.
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Affiliation(s)
- Caroline E Hansen
- Aflac Cancer and Blood Disorders Center, Department of Pediatrics, Children's Healthcare of Atlanta/Emory University School of Medicine , Atlanta, Georgia 30322, United States.,Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University , Atlanta, Georgia 30332, United States.,School of Chemistry and Biochemistry, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Wilbur A Lam
- Aflac Cancer and Blood Disorders Center, Department of Pediatrics, Children's Healthcare of Atlanta/Emory University School of Medicine , Atlanta, Georgia 30322, United States.,Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University , Atlanta, Georgia 30332, United States.,School of Chemistry and Biochemistry, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
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76
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Bekeschus S, Rödder K, Fregin B, Otto O, Lippert M, Weltmann KD, Wende K, Schmidt A, Gandhirajan RK. Toxicity and Immunogenicity in Murine Melanoma following Exposure to Physical Plasma-Derived Oxidants. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:4396467. [PMID: 28761621 PMCID: PMC5518506 DOI: 10.1155/2017/4396467] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Accepted: 05/04/2017] [Indexed: 02/07/2023]
Abstract
Metastatic melanoma is an aggressive and deadly disease. Therapeutic advance has been achieved by antitumor chemo- and radiotherapy. These modalities involve the generation of reactive oxygen and nitrogen species, affecting cellular viability, migration, and immunogenicity. Such species are also created by cold physical plasma, an ionized gas capable of redox modulating cells and tissues without thermal damage. Cold plasma has been suggested for anticancer therapy. Here, melanoma cell toxicity, motility, and immunogenicity of murine metastatic melanoma cells were investigated following plasma exposure in vitro. Cells were oxidized by plasma, leading to decreased metabolic activity and cell death. Moreover, plasma decelerated melanoma cell growth, viability, and cell cycling. This was accompanied by increased cellular stiffness and upregulation of zonula occludens 1 protein in the cell membrane. Importantly, expression levels of immunogenic cell surface molecules such as major histocompatibility complex I, calreticulin, and melanocortin receptor 1 were significantly increased in response to plasma. Finally, plasma treatment significantly decreased the release of vascular endothelial growth factor, a molecule with importance in angiogenesis. Altogether, these results suggest beneficial toxicity of cold plasma in murine melanomas with a concomitant immunogenicity of potential interest in oncology.
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Affiliation(s)
- Sander Bekeschus
- ZIK plasmatis, Leibniz Institute for Plasma Science and Technology (INP Greifswald), Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany
| | - Katrin Rödder
- ZIK plasmatis, Leibniz Institute for Plasma Science and Technology (INP Greifswald), Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany
| | - Bob Fregin
- ZIK HIKE, Fleischmannstr. 42-44, 17489 Greifswald, Germany
| | - Oliver Otto
- ZIK HIKE, Fleischmannstr. 42-44, 17489 Greifswald, Germany
| | - Maxi Lippert
- ZIK plasmatis, Leibniz Institute for Plasma Science and Technology (INP Greifswald), Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany
| | - Klaus-Dieter Weltmann
- ZIK plasmatis, Leibniz Institute for Plasma Science and Technology (INP Greifswald), Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany
| | - Kristian Wende
- ZIK plasmatis, Leibniz Institute for Plasma Science and Technology (INP Greifswald), Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany
| | - Anke Schmidt
- ZIK plasmatis, Leibniz Institute for Plasma Science and Technology (INP Greifswald), Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany
| | - Rajesh Kumar Gandhirajan
- ZIK plasmatis, Leibniz Institute for Plasma Science and Technology (INP Greifswald), Felix-Hausdorff-Str. 2, 17489 Greifswald, Germany
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