1
|
Yibibulla T, Hou L, Mead JL, Huang H, Fatikow S, Wang S. Frictional behavior of one-dimensional materials: an experimental perspective. NANOSCALE ADVANCES 2024; 6:3251-3284. [PMID: 38933866 PMCID: PMC11197433 DOI: 10.1039/d4na00039k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Accepted: 05/08/2024] [Indexed: 06/28/2024]
Abstract
The frictional behavior of one-dimensional (1D) materials, including nanotubes, nanowires, and nanofibers, significantly influences the efficient fabrication, functionality, and reliability of innovative devices integrating 1D components. Such devices comprise piezoelectric and triboelectric nanogenerators, biosensing and implantable devices, along with biomimetic adhesives based on 1D arrays. This review compiles and critically assesses recent experimental techniques for exploring the frictional behavior of 1D materials. Specifically, it underscores various measurement methods and technologies employing atomic force microscopy, electron microscopy, and optical microscopy nanomanipulation. The emphasis is on their primary applications and challenges in measuring and characterizing the frictional behavior of 1D materials. Additionally, we discuss key accomplishments over the past two decades in comprehending the frictional behaviors of 1D materials, with a focus on factors such as materials combination, interface roughness, environmental humidity, and non-uniformity. Finally, we offer a brief perspective on ongoing challenges and future directions, encompassing the systematic investigation of the testing environment and conditions, as well as the modification of surface friction through surface alterations.
Collapse
Affiliation(s)
- Tursunay Yibibulla
- School of Physics, Central South University Changsha 410083 P. R. China
- School of Physics and Electronics, Nanning Normal University Nanning 530001 P. R. China
| | - Lizhen Hou
- School of Physics and Electronics, Hunan Normal University Changsha 410083 P. R. China
| | - James L Mead
- Division Microrobotics and Control Engineering, Department of Computing Science, University of Oldenburg D-26129 Oldenburg Germany
| | - Han Huang
- School of Advanced Manufacturing, Sun-Yat-sen University Shenzhen 518107 P. R. China
| | - Sergej Fatikow
- Division Microrobotics and Control Engineering, Department of Computing Science, University of Oldenburg D-26129 Oldenburg Germany
| | - Shiliang Wang
- School of Physics, Central South University Changsha 410083 P. R. China
| |
Collapse
|
2
|
Kurjahn M, Deka A, Girot A, Abbaspour L, Klumpp S, Lorenz M, Bäumchen O, Karpitschka S. Quantifying gliding forces of filamentous cyanobacteria by self-buckling. eLife 2024; 12:RP87450. [PMID: 38864737 PMCID: PMC11178357 DOI: 10.7554/elife.87450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2024] Open
Abstract
Filamentous cyanobacteria are one of the oldest and today still most abundant lifeforms on earth, with manifold implications in ecology and economics. Their flexible filaments, often several hundred cells long, exhibit gliding motility in contact with solid surfaces. The underlying force generating mechanism is not yet understood. Here, we demonstrate that propulsion forces and friction coefficients are strongly coupled in the gliding motility of filamentous cyanobacteria. We directly measure their bending moduli using micropipette force sensors, and quantify propulsion and friction forces by analyzing their self-buckling behavior, complemented with analytical theory and simulations. The results indicate that slime extrusion unlikely generates the gliding forces, but support adhesion-based hypotheses, similar to the better-studied single-celled myxobacteria. The critical self-buckling lengths align well with the peaks of natural length distributions, indicating the importance of self-buckling for the organization of their collective in natural and artificial settings.
Collapse
Affiliation(s)
- Maximilian Kurjahn
- Max Planck Institute for Dynamics and Self-Organization (MPI-DS)GöttingenGermany
| | - Antaran Deka
- Max Planck Institute for Dynamics and Self-Organization (MPI-DS)GöttingenGermany
| | - Antoine Girot
- Max Planck Institute for Dynamics and Self-Organization (MPI-DS)GöttingenGermany
- Experimental Physics V, University of BayreuthBayreuthGermany
| | - Leila Abbaspour
- Max Planck School Matter to Life, University of GöttingenGöttingenGermany
- Institute for Dynamics of Complex Systems, University of GöttingenGöttingenGermany
| | - Stefan Klumpp
- Max Planck School Matter to Life, University of GöttingenGöttingenGermany
- Institute for Dynamics of Complex Systems, University of GöttingenGöttingenGermany
| | - Maike Lorenz
- Department of Experimental Phycology and SAG Culture Collection of Algae Albrecht-von-Haller Institute for Plant Science, University of GöttingenGöttingenGermany
| | - Oliver Bäumchen
- Max Planck Institute for Dynamics and Self-Organization (MPI-DS)GöttingenGermany
- Experimental Physics V, University of BayreuthBayreuthGermany
| | - Stefan Karpitschka
- Max Planck Institute for Dynamics and Self-Organization (MPI-DS)GöttingenGermany
- Fachbereich Physik, University of KonstanzKonstanzGermany
| |
Collapse
|
3
|
Cheung BCH, Chen X, Davis HJ, Nordmann CS, Toth J, Hodgson L, Segall JE, Shenoy VB, Wu M. Identification of CD44 as a key mediator of cell traction force generation in hyaluronic acid-rich extracellular matrices. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2023.10.24.563860. [PMID: 37961689 PMCID: PMC10634813 DOI: 10.1101/2023.10.24.563860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Mechanical properties of the extracellular matrix (ECM) critically regulate a number of important cell functions including growth, differentiation and migration. Type I collagen and glycosaminoglycans (GAGs) are two primary components of ECMs that contribute to mammalian tissue mechanics, with the collagen fiber network sustaining tension, and GAGs withstanding compression. The architecture and stiffness of the collagen network are known to be important for cell-ECM mechanical interactions via integrin cell surface adhesion receptors. In contrast, studies of GAGs in modulating cell-ECM interactions are limited. Here, we present experimental studies on the roles of hyaluronic acid (HA, an unsulfated GAG) in single tumor cell traction force generation using a recently developed 3D cell traction force microscopy method. Our work reveals that CD44, a cell surface adhesion receptor to HA, is engaged in cell traction force generation in conjunction with β1-integrin. We find that HA significantly modifies the architecture and mechanics of the collagen fiber network, decreasing tumor cells' propensity to remodel the collagen network, attenuating traction force generation, transmission distance, and tumor invasion. Our findings point to a novel role for CD44 in traction force generation, which can be a potential therapeutic target for diseases involving HA rich ECMs such as breast cancer and glioblastoma.
Collapse
|
4
|
Ye Y, Lin J. Fingering Instability Accelerates Population Growth of a Proliferating Cell Collective. PHYSICAL REVIEW LETTERS 2024; 132:018402. [PMID: 38242660 DOI: 10.1103/physrevlett.132.018402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 11/17/2023] [Indexed: 01/21/2024]
Abstract
During the growth of a cell collective, such as proliferating microbial colonies and epithelial tissues, the local cell growth increases the local pressure, which in turn suppresses cell growth. How this pressure-growth coupling affects the growth of a cell collective remains unclear. Here, we answer this question using a continuum model of a cell collective. We find that a fast-growing leading front and a slow-growing interior of the cell collective emerge due to the pressure-dependent growth rate. The leading front can exhibit fingering instability, and we confirm the predicted instability criteria numerically with the leading front explicitly simulated. Intriguingly, we find that fingering instability is not only a consequence of local cell growth but also enhances the entire population's growth rate as positive feedback. Our work unveils the fitness advantage of fingering formation and suggests that the ability to form protrusions can be evolutionarily selected.
Collapse
Affiliation(s)
- Yiyang Ye
- Center for Quantitative Biology, Peking University, Beijing, China
| | - Jie Lin
- Center for Quantitative Biology, Peking University, Beijing, China
- Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| |
Collapse
|
5
|
Amatu JB, Baudouin C, Trinh L, Labbé A, Buffault J. [Corneal epithelial biomechanics: Resistance to stress and role in healing and remodeling]. J Fr Ophtalmol 2023; 46:287-299. [PMID: 36759249 DOI: 10.1016/j.jfo.2022.09.026] [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: 09/04/2022] [Revised: 09/29/2022] [Accepted: 09/29/2022] [Indexed: 02/10/2023]
Abstract
The corneal epithelium is one of the first tissue barriers of the eye against the environment. In recent years, many studies provided better knowledge of its healing, its behavior and its essential role in the optical system of the eye. At the crossroads of basic science and clinical medicine, the study of the mechanical stresses applied to the cornea makes it possible to learn the behavior of epithelial cells and better understand ocular surface disease. We describe herein the current knowledge about the adhesion systems of the corneal epithelium and their resistance to mechanical stress. We will also describe the involvement of these mechanisms in corneal healing and their role in epithelial dynamics. Adhesion molecules of the epithelial cells, especially hemidesmosomes, allow the tissue cohesion required to maintain the integrity of the corneal epithelium against the shearing forces of the eyelids as well as external forces. Their regeneration after a corneal injury is mandatory for the restoration of a healthy epithelium. Mechanotransduction plays a significant role in regulating epithelial cell behavior, and the study of the epithelium's response to mechanical forces helps to better understand the evolution of epithelial profiles after refractive surgery. A better understanding of corneal epithelial biomechanics could also help improve future therapies, particularly in the field of tissue engineering.
Collapse
Affiliation(s)
- J-B Amatu
- Department of Ophthalmology III, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France.
| | - C Baudouin
- Department of Ophthalmology III, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France; Institut de La Vision, Sorbonne Université, Inserm, CNRS, IHU FOReSIGHT, 17, rue Moreau, 75012 Paris, France; Department of Ophthalmology, Ambroise Paré Hospital, AP-HP, University of Versailles Saint-Quentin-en-Yvelines, Boulogne-Billancourt, France
| | - L Trinh
- Department of Ophthalmology III, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France
| | - A Labbé
- Department of Ophthalmology III, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France; Institut de La Vision, Sorbonne Université, Inserm, CNRS, IHU FOReSIGHT, 17, rue Moreau, 75012 Paris, France; Department of Ophthalmology, Ambroise Paré Hospital, AP-HP, University of Versailles Saint-Quentin-en-Yvelines, Boulogne-Billancourt, France
| | - J Buffault
- Department of Ophthalmology III, CHNO des Quinze-Vingts, IHU FOReSIGHT, 28, rue de Charenton, 75012 Paris, France; Institut de La Vision, Sorbonne Université, Inserm, CNRS, IHU FOReSIGHT, 17, rue Moreau, 75012 Paris, France; Department of Ophthalmology, Ambroise Paré Hospital, AP-HP, University of Versailles Saint-Quentin-en-Yvelines, Boulogne-Billancourt, France
| |
Collapse
|
6
|
Wolfel A, Jin M, Paez JI. Current strategies for ligand bioconjugation to poly(acrylamide) gels for 2D cell culture: Balancing chemo-selectivity, biofunctionality, and user-friendliness. Front Chem 2022; 10:1012443. [PMID: 36204147 PMCID: PMC9530631 DOI: 10.3389/fchem.2022.1012443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 08/30/2022] [Indexed: 11/13/2022] Open
Abstract
Hydrogel biomaterials in combination with living cells are applied in cell biology, tissue engineering and regenerative medicine. In particular, poly(acrylamide) (PAM) hydrogels are frequently used in cell biology laboratories as soft substrates for 2D cell culture. These biomaterials present advantages such as the straightforward synthesis, regulable mechanical properties within physiological range of native soft tissues, the possibility to be biofunctionalized with ligands to support the culture of living cells, and their optical transparency that makes them compatible with microscopy methods. Due to the chemical inertness and protein repellant properties of PAM hydrogels, these materials alone do not support the adhesion of cells. Therefore, biofunctionalization of PAM gels is necessary to confer them bioactivity and to promote cell-material interactions. Herein, the current chemical strategies for the bioconjugation of ligands to PAM gels are reviewed. Different aspects of the existing bioconjugation methods such as chemo-selectivity and site-specificity of attachment, preservation of ligand’s functionality after binding, user-friendliness and cost are presented and compared. This work aims at guiding users in the choice of a strategy to biofunctionalize PAM gels with desired biochemical properties.
Collapse
|
7
|
Kim DE, Lee YB, Shim HE, Song JJ, Han JS, Moon KS, Huh KM, Kang SW. Application of Hexanoyl Glycol Chitosan as a Non-cell Adhesive Polymer in Three-Dimensional Cell Culture. ACS OMEGA 2022; 7:18471-18480. [PMID: 35694497 PMCID: PMC9178711 DOI: 10.1021/acsomega.2c00890] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Accepted: 05/16/2022] [Indexed: 06/15/2023]
Abstract
Cell culture technology has evolved into three-dimensional (3D) artificial tissue models for better reproduction of human native tissues. However, there are some unresolved limitations that arise due to the adhesive properties of cells. In this study, we developed a hexanoyl glycol chitosan (HGC) as a non-cell adhesive polymer for scaffold-based and -free 3D culture. The uniform cell distribution in a porous scaffold was well maintained during the long culutre period on the HGC-coated substrate by preventing ectopic adhesion and migration of cells on the substrate. In addition, when culturing many spheroids in one dish, supplementation of the culture medium with HGC prevented the aggregation of spheroids and maintained the shape and size of spheroids for a long culture duration. Collectively, the use of HGC in 3D culture systems is expected to contribute greatly to creating excellent regenerative therapeutics and screening models of bioproducts.
Collapse
Affiliation(s)
- Da-Eun Kim
- Research
Group for Biomimetic Advanced Technology, Korea Institute of Toxicology, Daejeon 34114, Republic of Korea
- Department
of Polymer Science and Engineering, Chungnam
National University, Daejeon 34134, Republic of Korea
| | - Yu Bin Lee
- Department
of Advanced Toxicology Research, Korea Institute
of Toxicology, Daejeon 34114, Republic of Korea
| | - Hye-Eun Shim
- Research
Group for Biomimetic Advanced Technology, Korea Institute of Toxicology, Daejeon 34114, Republic of Korea
- Department
of Polymer Science and Engineering, Chungnam
National University, Daejeon 34134, Republic of Korea
| | - Jin Jung Song
- Research
Group for Biomimetic Advanced Technology, Korea Institute of Toxicology, Daejeon 34114, Republic of Korea
- Department
of Polymer Science and Engineering, Chungnam
National University, Daejeon 34134, Republic of Korea
| | - Ji-Seok Han
- Department
of Toxicological Evaluation and Research, Korea Institute of Toxicology, Daejeon 34114, Republic of Korea
| | - Kyoung-Sik Moon
- Department
of Advanced Toxicology Research, Korea Institute
of Toxicology, Daejeon 34114, Republic of Korea
| | - Kang Moo Huh
- Department
of Polymer Science and Engineering, Chungnam
National University, Daejeon 34134, Republic of Korea
| | - Sun-Woong Kang
- Research
Group for Biomimetic Advanced Technology, Korea Institute of Toxicology, Daejeon 34114, Republic of Korea
- Human
and Environmental Toxicology Program, University
of Science and Technology, Daejeon 34114, Republic of Korea
| |
Collapse
|
8
|
Xue G, Zhang Y, Xie T, Zhang Z, Liu Q, Li X, Gou X. Cell Adhesion-Mediated Piezoelectric Self-Stimulation on Polydopamine-Modified Poly(vinylidene fluoride) Membranes. ACS APPLIED MATERIALS & INTERFACES 2021; 13:17361-17371. [PMID: 33823586 DOI: 10.1021/acsami.1c02457] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Cell adhesion-mediated piezoelectric stimulation provides a noninvasive method for in situ electrical regulation of cell behavior, offering new opportunities for the design of smart materials for tissue engineering and bioelectronic medicines. In particular, the surface potential is mainly dominated by the inherent piezoelectricity of the biomaterial and the dynamic adhesion state of cells. The development of an efficient and optimized material interface would have important implications in cell regulation. Herein, we modified the surface of poled poly(vinylidene fluoride) (PVDF) membranes through polymerization of dopamine and investigated their influence on cell adhesion and electromechanical self-stimulation. Our results demonstrated that mesenchymal stem cells seeded on the poled PVDF membrane exhibited stronger cell spreading and adhesion. Meanwhile, the surface modification through polydopamine significantly improved the hydrophilicity of the samples and contributed to the formation of cell actin bundles and maturation of focal adhesions, which further positively modulated cell piezoelectric self-stimulation and induced intracellular calcium transients. Combining with theoretical simulations, we found that the self-stimulation was enhanced mainly due to the increase of the adhesion site and adhesion force magnitude. These findings provide new insights for probing the cell regulation mechanism on piezoelectric substrates, offering more opportunities for the rational design of piezoelectric biomaterial interfaces for biomedical engineering.
Collapse
Affiliation(s)
- Guilan Xue
- Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China
| | - Yimeng Zhang
- Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China
| | - Tianpeng Xie
- Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China
| | - Zhanlin Zhang
- Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China
| | - Qingjie Liu
- Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China
| | - Xiaohong Li
- Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China
| | - Xue Gou
- Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China
| |
Collapse
|
9
|
Yeoman B, Shatkin G, Beri P, Banisadr A, Katira P, Engler AJ. Adhesion strength and contractility enable metastatic cells to become adurotactic. Cell Rep 2021; 34:108816. [PMID: 33691109 PMCID: PMC7997775 DOI: 10.1016/j.celrep.2021.108816] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 01/10/2021] [Accepted: 02/10/2021] [Indexed: 11/05/2022] Open
Abstract
Significant changes in cell stiffness, contractility, and adhesion, i.e., mechanotype, are observed during a variety of biological processes. Whether cell mechanics merely change as a side effect of or driver for biological processes is still unclear. Here, we sort genotypically similar metastatic cancer cells into strongly adherent (SA) versus weakly adherent (WA) phenotypes to study how contractility and adhesion differences alter the ability of cells to sense and respond to gradients in material stiffness. We observe that SA cells migrate up a stiffness gradient, or durotax, while WA cells largely ignore the gradient, i.e., adurotax. Biophysical modeling and experimental validation suggest that differences in cell migration and durotaxis between weakly and strongly adherent cells are driven by differences in intra-cellular actomyosin activity. These results provide a direct relationship between cell phenotype and durotaxis and suggest how, unlike other senescent cells, metastatic cancer cells navigate against stiffness gradients.
Collapse
Affiliation(s)
- Benjamin Yeoman
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093, USA; Department of Mechanical Engineering, San Diego State University, San Diego, CA 92182, USA
| | - Gabriel Shatkin
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093, USA
| | - Pranjali Beri
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093, USA
| | - Afsheen Banisadr
- Biomedical Sciences Program, University of California, San Diego, La Jolla, CA 92093, USA
| | - Parag Katira
- Department of Mechanical Engineering, San Diego State University, San Diego, CA 92182, USA; Computational Sciences Research Center, San Diego State University, San Diego, CA 92182, USA.
| | - Adam J Engler
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093, USA; Biomedical Sciences Program, University of California, San Diego, La Jolla, CA 92093, USA.
| |
Collapse
|
10
|
Missirlis D, Haraszti T, Heckmann L, Spatz JP. Substrate Resistance to Traction Forces Controls Fibroblast Polarization. Biophys J 2020; 119:2558-2572. [PMID: 33217384 DOI: 10.1016/j.bpj.2020.10.043] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 10/21/2020] [Accepted: 10/23/2020] [Indexed: 12/25/2022] Open
Abstract
The mechanics of fibronectin-rich extracellular matrix regulate cell physiology in a number of diseases, prompting efforts to elucidate cell mechanosensing mechanisms at the molecular and cellular scale. Here, the use of fibronectin-functionalized silicone elastomers that exhibit considerable frequency dependence in viscoelastic properties unveiled the presence of two cellular processes that respond discreetly to substrate mechanical properties. Weakly cross-linked elastomers supported efficient focal adhesion maturation and fibroblast spreading because of an apparent stiff surface layer. However, they did not enable cytoskeletal and fibroblast polarization; elastomers with high cross-linking and low deformability were required for polarization. Our results suggest as an underlying reason for this behavior the inability of soft elastomer substrates to resist traction forces rather than a lack of sufficient traction force generation. Accordingly, mild inhibition of actomyosin contractility rescued fibroblast polarization even on the softer elastomers. Our findings demonstrate differential dependence of substrate physical properties on distinct mechanosensitive processes and provide a premise to reconcile previously proposed local and global models of cell mechanosensing.
Collapse
Affiliation(s)
- Dimitris Missirlis
- Max-Planck-Institute for Medical Research, Department of Cellular Biophysics, Heidelberg, Germany.
| | - Tamás Haraszti
- DWI-Leibniz Institute for Interactive Materials, Aachen, Germany; RWTH Aachen University, Institute for Technical and Macromolecular Chemistry, Aachen, Germany
| | - Lara Heckmann
- Max-Planck-Institute for Medical Research, Department of Cellular Biophysics, Heidelberg, Germany
| | - Joachim P Spatz
- Max-Planck-Institute for Medical Research, Department of Cellular Biophysics, Heidelberg, Germany; Heidelberg University, Department of Biophysical Chemistry, Physical Chemistry Institute, Heidelberg, Germany
| |
Collapse
|
11
|
Bogdan MJ, Savin T. Fingering instabilities in tissue invasion: an active fluid model. ROYAL SOCIETY OPEN SCIENCE 2018; 5:181579. [PMID: 30662758 PMCID: PMC6304124 DOI: 10.1098/rsos.181579] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Accepted: 11/20/2018] [Indexed: 05/26/2023]
Abstract
Metastatic tumours often invade healthy neighbouring tissues by forming multicellular finger-like protrusions emerging from the cancer mass. To understand the mechanical context behind this phenomenon, we here develop a minimalist fluid model of a self-propelled, growing biological tissue. The theory involves only four mechanical parameters and remains analytically trackable in various settings. As an application of the model, we study the evolution of a two-dimensional circular droplet made of our active and expanding fluid, and embedded in a passive non-growing tissue. This system could be used to model the evolution of a carcinoma in an epithelial layer. We find that our description can explain the propensity of tumour tissues to fingering instabilities, as conditioned by the magnitude of active traction and the growth kinetics. We are also able to derive predictions for the tumour size at the onset of metastasis, and for the number of subsequent invasive fingers. Our active fluid model may help describe a wider range of biological processes, including wound healing and developmental patterning.
Collapse
|
12
|
Müller C, Ansorge M, Espig M, Zschoche S, Schiller J, Pompe T. Covalent Binding of Maleic Anhydride Copolymer Monolayers to Polyacrylamide Hydrogels. MACROMOL CHEM PHYS 2018. [DOI: 10.1002/macp.201800206] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Christina Müller
- Institute of Biochemistry; Leipzig University,; Johannisallee 21/23, 04103 Leipzig Germany
| | - Michael Ansorge
- Institute of Biochemistry; Leipzig University,; Johannisallee 21/23, 04103 Leipzig Germany
| | - Martin Espig
- Institute of Biochemistry; Leipzig University,; Johannisallee 21/23, 04103 Leipzig Germany
| | - Stefan Zschoche
- Leibniz Institute of Polymer Research Dresden; Hohe Str. 6, 01069 Dresden Germany
| | - Jürgen Schiller
- Institute of Medical Physics and Biophysics; Leipzig University; Härtelstr. 16-18, 04107 Leipzig Germany
| | - Tilo Pompe
- Institute of Biochemistry; Leipzig University,; Johannisallee 21/23, 04103 Leipzig Germany
- Leibniz Institute of Polymer Research Dresden; Hohe Str. 6, 01069 Dresden Germany
| |
Collapse
|
13
|
Tunable cell-surface mimetics as engineered cell substrates. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:2076-2093. [PMID: 29935145 DOI: 10.1016/j.bbamem.2018.06.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Revised: 05/18/2018] [Accepted: 06/08/2018] [Indexed: 12/21/2022]
Abstract
Most recent breakthroughs in understanding cell adhesion, cell migration, and cellular mechanosensitivity have been made possible by the development of engineered cell substrates of well-defined surface properties. Traditionally, these substrates mimic the extracellular matrix (ECM) environment by the use of ligand-functionalized polymeric gels of adjustable stiffness. However, such ECM mimetics are limited in their ability to replicate the rich dynamics found at cell-cell contacts. This review focuses on the application of cell surface mimetics, which are better suited for the analysis of cell adhesion, cell migration, and cellular mechanosensitivity across cell-cell interfaces. Functionalized supported lipid bilayer systems were first introduced as biomembrane-mimicking substrates to study processes of adhesion maturation during adhesion of functionalized vesicles (cell-free assay) and plated cells. However, while able to capture adhesion processes, the fluid lipid bilayer of such a relatively simple planar model membrane prevents adhering cells from transducing contractile forces to the underlying solid, making studies of cell migration and cellular mechanosensitivity largely impractical. Therefore, the main focus of this review is on polymer-tethered lipid bilayer architectures as biomembrane-mimicking cell substrate. Unlike supported lipid bilayers, these polymer-lipid composite materials enable the free assembly of linkers into linker clusters at cellular contacts without hindering cell spreading and migration and allow the controlled regulation of mechanical properties, enabling studies of cellular mechanosensitivity. The various polymer-tethered lipid bilayer architectures and their complementary properties as cell substrates are discussed.
Collapse
|
14
|
Abstract
Numerous methods have been reported for the fabrication of 3D multi-cellular spheroids and their use in stem cell culture. Current methods typically relying on the self-assembly of trypsinized, suspended stem cells, however, show limitations with respect to cell viability, throughput, and accurate recapitulation of the natural microenvironment. In this study, we developed a new system for engineering cell spheroids by self-assembly of micro-scale monolayer of stem cells. We prepared synthetic hydrogels with the surface of chemically formed micropatterns (squares/circles with width/diameter of 200 μm) on which mesenchymal stem cells isolated from human nasal turbinate tissue (hTMSCs) were selectively attached and formed a monolayer. The hydrogel is capable of thermally controlled expansion. As the temperature was decreased from 37 to 4 °C, the cell layer detached rapidly (<10 min) and assembled to form spheroids with consistent size (∼100 μm) and high viability (>90%). Spheroidization was significantly delayed and occurred with reduced efficiency on circle patterns compared to square patterns. Multi-physics mapping supported that delamination of the micro-scale monolayer may be affected by stress concentrated at the corners of the square pattern. In contrast, stress was distributed symmetrically along the boundary of the circle pattern. In addition, treatment of the micro-scale monolayer with a ROCK inhibitor significantly retarded spheroidization, highlighting the importance of contraction mediated by actin stress fibers for the stable generation of spheroidal stem cell structures. Spheroids prepared from the assembly of monolayers showed higher expression, both on the mRNA and protein levels, of ECM proteins (fibronectin and laminin) and stemness markers (Oct4, Sox2, and Nanog) compared to spheroids prepared from low-attachment plates, in which trypsinized single cells are assembled. The hTMSC spheroids also presented enhanced expression levels of markers related to tri-lineage (osteogenic, chondrogenic and adipogenic) differentiation. The changes in microcellular environments and functionalities were double-confirmed by using adipose derived mesenchymal stem cells (ADSCs). This spheroid engineering technique may have versatile applications in regenerative medicine for functionally improved 3D culture and therapeutic cell delivery.
Collapse
|
15
|
Glazier R, Salaita K. Supported lipid bilayer platforms to probe cell mechanobiology. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2017; 1859:1465-1482. [PMID: 28502789 PMCID: PMC5531615 DOI: 10.1016/j.bbamem.2017.05.005] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 05/09/2017] [Accepted: 05/09/2017] [Indexed: 12/15/2022]
Abstract
Mammalian and bacterial cells sense and exert mechanical forces through the process of mechanotransduction, which interconverts biochemical and physical signals. This is especially important in contact-dependent signaling, where ligand-receptor binding occurs at cell-cell or cell-ECM junctions. By virtue of occurring within these specialized junctions, receptors engaged in contact-dependent signaling undergo oligomerization and coupling with the cytoskeleton as part of their signaling mechanisms. While our ability to measure and map biochemical signaling within cell junctions has advanced over the past decades, physical cues remain difficult to map in space and time. Recently, supported lipid bilayer (SLB) technologies have emerged as a flexible platform to mimic and perturb cell-cell and cell-ECM junctions, allowing one to study membrane receptor mechanotransduction. Changing the lipid composition and underlying substrate tunes bilayer fluidity, and lipid and ligand micro- and nano-patterning spatially control positioning and clustering of receptors. Patterning metal gridlines within SLBs confines lipid mobility and introduces mechanical resistance. Here we review fundamental SLB mechanics and how SLBs can be engineered as tunable cell substrates for mechanotransduction studies. Finally, we highlight the impact of this work in understanding the biophysical mechanisms of cell adhesion. This article is part of a Special Issue entitled: Interactions between membrane receptors in cellular membranes edited by Kalina Hristova.
Collapse
Affiliation(s)
- Roxanne Glazier
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, and Emory University, Atlanta, GA 30322, United States
| | - Khalid Salaita
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, and Emory University, Atlanta, GA 30322, United States; Department of Chemistry, Emory University, Atlanta, GA 30322, United States..
| |
Collapse
|
16
|
Kurzawa L, Vianay B, Senger F, Vignaud T, Blanchoin L, Théry M. Dissipation of contractile forces: the missing piece in cell mechanics. Mol Biol Cell 2017; 28:1825-1832. [PMID: 28684608 PMCID: PMC5526557 DOI: 10.1091/mbc.e16-09-0672] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Revised: 06/01/2017] [Accepted: 06/02/2017] [Indexed: 12/12/2022] Open
Abstract
Mechanical forces are key regulators of cell and tissue physiology. The basic molecular mechanism of fiber contraction by the sliding of actin filament upon myosin leading to conformational change has been known for decades. The regulation of force generation at the level of the cell, however, is still far from elucidated. Indeed, the magnitude of cell traction forces on the underlying extracellular matrix in culture is almost impossible to predict or experimentally control. The considerable variability in measurements of cell-traction forces indicates that they may not be the optimal readout to properly characterize cell contractile state and that a significant part of the contractile energy is not transferred to cell anchorage but instead is involved in actin network dynamics. Here we discuss the experimental, numerical, and biological parameters that may be responsible for the variability in traction force production. We argue that limiting these sources of variability and investigating the dissipation of mechanical work that occurs with structural rearrangements and the disengagement of force transmission is key for further understanding of cell mechanics.
Collapse
Affiliation(s)
- Laetitia Kurzawa
- CytoMorpho Lab, Biosciences and Biotechnology Institute of Grenoble, UMR5168, Université Grenoble-Alpes, CEA, CNRS, INRA, 38054 Grenoble, France
| | - Benoit Vianay
- Université Paris Diderot, INSERM, CEA, CytoMorpho Lab, Hôpital Saint Louis, Institut Universitaire d’Hematologie, UMRS1160, 75010 Paris, France
| | - Fabrice Senger
- CytoMorpho Lab, Biosciences and Biotechnology Institute of Grenoble, UMR5168, Université Grenoble-Alpes, CEA, CNRS, INRA, 38054 Grenoble, France
| | - Timothée Vignaud
- CytoMorpho Lab, Biosciences and Biotechnology Institute of Grenoble, UMR5168, Université Grenoble-Alpes, CEA, CNRS, INRA, 38054 Grenoble, France
| | - Laurent Blanchoin
- CytoMorpho Lab, Biosciences and Biotechnology Institute of Grenoble, UMR5168, Université Grenoble-Alpes, CEA, CNRS, INRA, 38054 Grenoble, France
- Université Paris Diderot, INSERM, CEA, CytoMorpho Lab, Hôpital Saint Louis, Institut Universitaire d’Hematologie, UMRS1160, 75010 Paris, France
| | - Manuel Théry
- CytoMorpho Lab, Biosciences and Biotechnology Institute of Grenoble, UMR5168, Université Grenoble-Alpes, CEA, CNRS, INRA, 38054 Grenoble, France
- Université Paris Diderot, INSERM, CEA, CytoMorpho Lab, Hôpital Saint Louis, Institut Universitaire d’Hematologie, UMRS1160, 75010 Paris, France
| |
Collapse
|
17
|
Müller C, Pompe T. Distinct impacts of substrate elasticity and ligand affinity on traction force evolution. SOFT MATTER 2016; 12:272-280. [PMID: 26451588 DOI: 10.1039/c5sm01706h] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Cell adhesion is regulated by the mechanical characteristics of the cell environment. The influences of different parameters of the adhesive substrates are convoluted in the cell response leading to questions on the underlying mechanisms, like biochemical signaling on the level of adhesion molecules, or viscoelastic properties of substrates and cell. By a time-resolved analysis of traction force generation during early cell adhesion, we wanted to elucidate the contributions of substrate mechanics to the adhesion process, in particular the impact of substrate elasticity and the molecular friction of adhesion ligands on the substrate surface. Both parameters were independently adjusted by (i) an elastic polyacrylamide hydrogel of variable crosslinking degree and (ii) a thin polymer coating of the hydrogel surface controlling the affinity (and the correlated substrate-ligand friction) of the adhesion ligand fibronectin. Our analysis showed two sequential regimes of considerable force generation, whose occurrence was found to be independent of substrate properties. The first regime is characterized by spreading of the cell and a succeeding force increase. After spreading cells enter the second regime with saturated forces. Substrate elasticity and viscosity, namely hydrogel elasticity and ligand affinity, were both found to affect the kinetics and absolute levels of traction force quantities. A faster increase and a higher saturation level of traction forces were observed for a higher substrate stiffness and a higher ligand affinity. The results complement recent modeling approaches on the evolution of forces in cell spreading and contribute to a better understanding of the dynamics of cell adhesion on viscoelastic substrates.
Collapse
Affiliation(s)
- Christina Müller
- Faculty of Biosciences, Pharmacy and Psychology, Universität Leipzig, Johannisallee 21-23, 04103 Leipzig, Germany.
| | - Tilo Pompe
- Faculty of Biosciences, Pharmacy and Psychology, Universität Leipzig, Johannisallee 21-23, 04103 Leipzig, Germany.
| |
Collapse
|
18
|
Yang H, Gou X, Wang Y, Fahmy TM, Leung AYH, Lu J, Sun D. A dynamic model of chemoattractant-induced cell migration. Biophys J 2016; 108:1645-1651. [PMID: 25863056 DOI: 10.1016/j.bpj.2014.12.060] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Revised: 12/23/2014] [Accepted: 12/31/2014] [Indexed: 10/23/2022] Open
Abstract
Cell migration refers to a directional cell movement in response to chemoattractant stimulation. In this work, we developed a cell-migration model by mimicking in vivo migration using optically manipulated chemoattractant-loaded microsources. The model facilitates a quantitative characterization of the relationship among the protrusion force, cell motility, and chemoattractant gradient for the first time (to our knowledge). We verified the correctness of the model using migrating leukemia cancer Jurkat cells. The results show that one can achieve the ideal migrating capacity by choosing the appropriate chemoattractant gradient and concentration at the leading edge of the cell.
Collapse
Affiliation(s)
- Hao Yang
- Department of Automation, University of Science and Technology of China, Hefei, China; Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong, China
| | - Xue Gou
- Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong, China
| | - Yong Wang
- Department of Automation, University of Science and Technology of China, Hefei, China
| | - Tarek M Fahmy
- Department of Biomedical Engineering, Yale University, New Haven, Connecticut
| | - Anskar Y-H Leung
- Department of Medicine, The University of Hong Kong, Hong Kong, China
| | - Jian Lu
- Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong, China
| | - Dong Sun
- Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong, China.
| |
Collapse
|
19
|
Abstract
Mechanical stimuli are known to be potent regulators of the form and function of cells and organisms. Although biological regulation has classically been understood in terms of principles from solution biochemistry, advancements in many fields have led to the development of a suite of techniques that are able to reveal the interplay between mechanical loading and changes in the biochemical properties of proteins in systems ranging from single molecules to living organisms. Here, we review these techniques and highlight the emergence of a new molecular-scale understanding of the mechanisms mediating the detection and response of cells to mechanical stimuli, a process termed mechanotransduction. Specifically, we focus on the role of subcellular adhesion structures in sensing the stiffness of the surrounding environment because this process is pertinent to applications in tissue engineering as well the onset of several mechanosensitive disease states, including cancer.
Collapse
Affiliation(s)
- Andrew S LaCroix
- Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708;
| | - Katheryn E Rothenberg
- Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708;
| | - Brenton D Hoffman
- Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708;
| |
Collapse
|
20
|
Martin S, Wang H, Hartmann L, Pompe T, Schmidt S. Quantification of protein–materials interaction by soft colloidal probe spectroscopy. Phys Chem Chem Phys 2015; 17:3014-8. [DOI: 10.1039/c4cp05484a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The interactions between protein layers and material surfaces with varying hydrophobicity are detected by a novel technique based on soft, mechanically deformable hydrogel particles.
Collapse
Affiliation(s)
- Steve Martin
- Institute of Biochemistry
- Leipzig University
- 04103 Leipzig
- Germany
| | - Hanqing Wang
- Institute of Organic and Macromolecular Chemistry
- Heinrich Heine University Düsseldorf
- Düsseldorf
- Germany
| | - Laura Hartmann
- Institute of Organic and Macromolecular Chemistry
- Heinrich Heine University Düsseldorf
- Düsseldorf
- Germany
| | - Tilo Pompe
- Institute of Biochemistry
- Leipzig University
- 04103 Leipzig
- Germany
| | - Stephan Schmidt
- Institute of Biochemistry
- Leipzig University
- 04103 Leipzig
- Germany
| |
Collapse
|
21
|
Lautscham LA, Lin CY, Auernheimer V, Naumann CA, Goldmann WH, Fabry B. Biomembrane-mimicking lipid bilayer system as a mechanically tunable cell substrate. Biomaterials 2014; 35:3198-207. [PMID: 24439398 PMCID: PMC4026006 DOI: 10.1016/j.biomaterials.2013.12.091] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Accepted: 12/22/2013] [Indexed: 11/26/2022]
Abstract
Cell behavior such as cell adhesion, spreading, and contraction critically depends on the elastic properties of the extracellular matrix. It is not known, however, how cells respond to viscoelastic or plastic material properties that more closely resemble the mechanical environment cells encounter in the body. In this report, we employ viscoelastic and plastic biomembrane-mimicking cell substrates. The compliance of the substrates can be tuned by increasing the number of polymer-tethered bilayers. This leaves the density and conformation of adhesive ligands on the top bilayer unaltered. We then observe the response of fibroblasts to these property changes. For comparison, we also study the cells on soft polyacrylamide and hard glass surfaces. Cell morphology, motility, cell stiffness, contractile forces and adhesive contact size all decrease on more compliant matrices but are less sensitive to changes in matrix dissipative properties. These data suggest that cells are able to feel and respond predominantly to the effective matrix compliance, which arises as a combination of substrate and adhesive ligand mechanical properties.
Collapse
Affiliation(s)
- Lena A Lautscham
- Department of Biophysics, University of Erlangen-Nuremberg, Erlangen 91052, Germany.
| | - Corey Y Lin
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University, Indianapolis 46202, USA
| | - Vera Auernheimer
- Department of Biophysics, University of Erlangen-Nuremberg, Erlangen 91052, Germany
| | - Christoph A Naumann
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University, Indianapolis 46202, USA
| | - Wolfgang H Goldmann
- Department of Biophysics, University of Erlangen-Nuremberg, Erlangen 91052, Germany
| | - Ben Fabry
- Department of Biophysics, University of Erlangen-Nuremberg, Erlangen 91052, Germany
| |
Collapse
|
22
|
Angelini TE, Dunn AC, Urueña JM, Dickrell DJ, Burris DL, Sawyer WG. Cell friction. Faraday Discuss 2013; 156:31-9; discussion 87-103. [PMID: 23285620 DOI: 10.1039/c2fd00130f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Cells sense and respond to their environment. Mechanotransduction is the process by which mechanical forces, stress, and strains are converted into biochemical signals that control cell behavior. In recent decades it has been shown that appropriate mechanical signals are essential to tissue health, but the role of friction and direct contact shearing across cell surfaces has been essentially unexplored. This, despite the obvious existence of numerous biological tissues whose express function depends on sliding contacts. In our studies on frictional interactions of corneal cells we find that the friction coefficients are on the order of mu = 0.03-0.06 for in vitro and in vivo experiments. Additionally, we observe cell death after single cycles of sliding at contact pressures estimated to be approximately 12 kPa. These experimental results suggest that frictional contact forces produce mechanical stresses and strains that are in the cellular mechanosensing ranges.
Collapse
Affiliation(s)
- T E Angelini
- Dept. of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA
| | | | | | | | | | | |
Collapse
|
23
|
Sugihara K, Delai M, Mahnna R, Kusch J, Poulikakos D, Vörös J, Zambelli T, Ferrari A. Label-free detection of cell-contractile activity with lipid nanotubes. Integr Biol (Camb) 2012; 5:423-30. [DOI: 10.1039/c2ib20202f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Kaori Sugihara
- Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
| | - Marco Delai
- Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
| | - Rami Mahnna
- Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
| | - Justine Kusch
- LMC, Switzerland Light Microscopy Center, D-Biol, ETH Zurich, Schafmattstrasse 18, CH-8093 Zurich, Switzerland
| | - Dimos Poulikakos
- Laboratory of Thermodynamics in Emerging Technologies, Institute of Energy Technology, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, CH-8092 Zurich, Switzerland
| | - János Vörös
- Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
| | - Tomaso Zambelli
- Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
| | - Aldo Ferrari
- Laboratory of Thermodynamics in Emerging Technologies, Institute of Energy Technology, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, CH-8092 Zurich, Switzerland
| |
Collapse
|
24
|
Nanoscale characterization of cell receptors and binding sites on cell-derived extracellular matrices. Ultramicroscopy 2012; 118:44-52. [DOI: 10.1016/j.ultramic.2012.04.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Revised: 03/20/2012] [Accepted: 04/20/2012] [Indexed: 01/16/2023]
|