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Chandurkar MK, Mittal N, Royer-Weeden SP, Lehmann SD, Michels EB, Haarman SE, Severance SA, Rho Y, Han SJ. Transient low shear-stress preconditioning influences long-term endothelial traction and alignment under high shear flow. Am J Physiol Heart Circ Physiol 2024; 326:H1180-H1192. [PMID: 38457352 DOI: 10.1152/ajpheart.00067.2024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Revised: 03/01/2024] [Accepted: 03/03/2024] [Indexed: 03/10/2024]
Abstract
Endothelial cells (ECs) within the vascular system encounter fluid shear stress (FSS). High, laminar FSS promotes vasodilation and anti-inflammatory responses, whereas low or disturbed FSS induces dysfunction and inflammation. However, the adaptation of endothelial cells (ECs) to dynamically changing FSS patterns remains underexplored. Here, by combining traction force microscopy with a custom flow chamber, we examined human umbilical vein endothelial cells adapting their traction during transitions from short-term low shear to long-term high shear stress. We discovered that the initial low FSS elevates the traction by only half of the amount in response to direct high FSS even after flow changes to high FSS. However, in the long term under high FSS, the flow started with low FSS triggers a substantial second rise in traction for over 10 h. In contrast, the flow started directly with high FSS results in a quick traction surge followed by a huge reduction below the baseline traction in <30 min. Importantly, we find that the orientation of traction vectors is steered by initial shear exposure. Using Granger causality analysis, we show that the traction that aligns in the flow direction under direct high FSS functionally causes cell alignment toward the flow direction. However, EC traction that orients perpendicular to the flow that starts with temporary low FSS functionally causes cell orientation perpendicular to the flow. Taken together, our findings elucidate the significant influence of initial short-term low FSS on lasting changes in endothelial traction that induces EC alignment.NEW & NOTEWORTHY In our study, we uncover that preconditioning with low shear stress yields enduring impacts on endothelial cell traction and orientation, persisting even after transitioning to high-shear conditions. Using Granger causality analysis, we demonstrate a functional link between the direction of cell traction and subsequent cellular alignment across varying shear environments.
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Affiliation(s)
- Mohanish K Chandurkar
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan, United States
- Health Research Institute, Michigan Technological University, Houghton, Michigan, United States
| | - Nikhil Mittal
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan, United States
- Health Research Institute, Michigan Technological University, Houghton, Michigan, United States
| | - Shaina P Royer-Weeden
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan, United States
- Health Research Institute, Michigan Technological University, Houghton, Michigan, United States
| | - Steven D Lehmann
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan, United States
| | - Etienne B Michels
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan, United States
| | - Samuel E Haarman
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan, United States
- Health Research Institute, Michigan Technological University, Houghton, Michigan, United States
| | - Scott A Severance
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan, United States
| | - Yeonwoo Rho
- Department of Mathematical Sciences, Michigan Technological University, Houghton, Michigan, United States
| | - Sangyoon J Han
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan, United States
- Health Research Institute, Michigan Technological University, Houghton, Michigan, United States
- Department of Mechanical Engineering and Engineering Mechanics, Michigan Technological University, Houghton, Michigan, United States
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2
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Sakamoto N, Ito K, Ii S, Conway DE, Ueda Y, Nagatomi J. A homeostatic role of nucleus-actin filament coupling in the regulation of cellular traction forces in fibroblasts. Biomech Model Mechanobiol 2024:10.1007/s10237-024-01839-1. [PMID: 38502433 DOI: 10.1007/s10237-024-01839-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2024] [Accepted: 03/04/2024] [Indexed: 03/21/2024]
Abstract
Cellular traction forces are contractile forces that depend on the material/substrate stiffness and play essential roles in sensing mechanical environments and regulating cell morphology and function. Traction forces are primarily generated by the actin cytoskeleton and transmitted to the substrate through focal adhesions. The cell nucleus is also believed to be involved in the regulation of this type of force; however, the role of the nucleus in cellular traction forces remains unclear. In this study, we explored the effects of nucleus-actin filament coupling on cellular traction forces in human dermal fibroblasts cultured on substrates with varying stiffness (5, 15, and 48 kPa). To investigate these effects, we transfected the cells with a dominant-negative Klarsicht/ANC-1/Syne homology (DN-KASH) protein that was designed to displace endogenous linker proteins and disrupt nucleus-actin cytoskeleton connections. The force that exists between the cytoskeleton and the nucleus (nuclear tension) was also evaluated with a fluorescence resonance energy transfer (FRET)-based tension sensor. We observed a biphasic change in cellular traction forces with a peak at 15 kPa, regardless of DN-KASH expression, that was inversely correlated with the nuclear tension. In addition, the relative magnitude and distribution of traction forces in nontreated wild-type cells were similar across different stiffness conditions, while DN-KASH-transfected cells exhibited a different distribution pattern that was impacted by the substrate stiffness. These results suggest that the nucleus-actin filament coupling play a homeostatic role by maintaining the relative magnitude of cellular traction forces in fibroblasts under different stiffness conditions.
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Affiliation(s)
- Naoya Sakamoto
- Department of Mechanical Systems Engineering, Tokyo Metropolitan University, Minami- Osawa 1-1, Hachioji, Tokyo, 192-0397, Japan.
- Research Center for Medicine-Engineering Collaboration, Tokyo Metropolitan University, Minami-Osawa 1-1, Hachioji, Tokyo, 192-0397, Japan.
| | - Keisuke Ito
- Department of Mechanical Systems Engineering, Tokyo Metropolitan University, Minami- Osawa 1-1, Hachioji, Tokyo, 192-0397, Japan
| | - Satoshi Ii
- Department of Mechanical Systems Engineering, Tokyo Metropolitan University, Minami- Osawa 1-1, Hachioji, Tokyo, 192-0397, Japan
- Research Center for Medicine-Engineering Collaboration, Tokyo Metropolitan University, Minami-Osawa 1-1, Hachioji, Tokyo, 192-0397, Japan
| | - Daniel E Conway
- Department of Biomedical Engineering, The Ohio State University, 140W 19th Avenue, Columbus, OH, USA
| | - Yuki Ueda
- Department of Mechanical Systems Engineering, Tokyo Metropolitan University, Minami- Osawa 1-1, Hachioji, Tokyo, 192-0397, Japan
| | - Jiro Nagatomi
- Research Center for Medicine-Engineering Collaboration, Tokyo Metropolitan University, Minami-Osawa 1-1, Hachioji, Tokyo, 192-0397, Japan
- Department of Bioengineering, Clemson University, 301 Rhodes Research Center, Clemson, SC, 29634-0905, USA
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3
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Chandurkar MK, Mittal N, Royer-Weeden SP, Lehmann SD, Rho Y, Han SJ. Low Shear in Short-Term Impacts Endothelial Cell Traction and Alignment in Long-Term. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2023.09.20.558732. [PMID: 37790318 PMCID: PMC10542130 DOI: 10.1101/2023.09.20.558732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
Within the vascular system, endothelial cells (ECs) are exposed to fluid shear stress (FSS), a mechanical force exerted by blood flow that is critical for regulating cellular tension and maintaining vascular homeostasis. The way ECs react to FSS varies significantly; while high, laminar FSS supports vasodilation and suppresses inflammation, low or disturbed FSS can lead to endothelial dysfunction and increase the risk of cardiovascular diseases. Yet, the adaptation of ECs to dynamically varying FSS remains poorly understood. This study focuses on the dynamic responses of ECs to brief periods of low FSS, examining its impact on endothelial traction-a measure of cellular tension that plays a crucial role in how endothelial cells respond to mechanical stimuli. By integrating traction force microscopy (TFM) with a custom-built flow chamber, we analyzed how human umbilical vein endothelial cells (HUVECs) adjust their traction in response to shifts from low to high shear stress. We discovered that initial exposure to low FSS prompts a marked increase in traction force, which continues to rise over 10 hours before slowly decreasing. In contrast, immediate exposure to high FSS causes a quick spike in traction followed by a swift reduction, revealing distinct patterns of traction behavior under different shear conditions. Importantly, the direction of traction forces and the resulting cellular alignment under these conditions indicate that the initial shear experience dictates long-term endothelial behavior. Our findings shed light on the critical influence of short-lived low-shear stress experiences in shaping endothelial function, indicating that early exposure to low FSS results in enduring changes in endothelial contractility and alignment, with significant consequences for vascular health and the development of cardiovascular diseases.
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Affiliation(s)
- Mohanish K. Chandurkar
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931
- Health Research Institute, Michigan Technological University, Houghton, MI 49931
| | - Nikhil Mittal
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931
- Health Research Institute, Michigan Technological University, Houghton, MI 49931
| | - Shaina P. Royer-Weeden
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931
- Health Research Institute, Michigan Technological University, Houghton, MI 49931
| | - Steven D. Lehmann
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931
| | - Yeonwoo Rho
- Department of Mathematical Sciences, Michigan Technological University, Houghton, MI 49931
| | - Sangyoon J. Han
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931
- Health Research Institute, Michigan Technological University, Houghton, MI 49931
- Department of Mechanical Engineering and Engineering Mechanics, Michigan Technological University, Houghton, MI 49931
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4
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Human endothelial cells display a rapid tensional stress increase in response to tumor necrosis factor-α. PLoS One 2022; 17:e0270197. [PMID: 35749538 PMCID: PMC9232152 DOI: 10.1371/journal.pone.0270197] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 06/06/2022] [Indexed: 02/07/2023] Open
Abstract
Endothelial cells form the inner layer of blood vessels, making them the first barrier between the blood and interstitial tissues; thus endothelial cells play a crucial role in inflammation. In the inflammatory response, one important element is the pro-inflammatory cytokine tumor necrosis factor-α (TNF-α). While other pro-inflammatory agents like thrombin and histamine induce acute but transient changes in endothelial cells, which have been well studied biologically as well as mechanically, TNF-α is primarily known for its sustained effects on permeability and leukocyte recruitment. These functions are associated with transcriptional changes that take place on the timescale of hours and days. Here, we investigated the early mechanical action of TNF-α and show that even just 4 min after TNF-α was added onto human umbilical vein endothelial cell monolayers, there was a striking rise in mechanical substrate traction force and internal monolayer tension. These traction forces act primarily at the boundary of the monolayer, as was to be expected. This increased internal monolayer tension may, in addition to TNF-α’s other well-studied biochemical responses, provide a mechanical signal for the cells to prepare to recruit leukocytes.
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Kopenhagen A, Ramming I, Camp B, Hammerschmidt S, Fulde M, Müsken M, Steinert M, Bergmann S. Streptococcus pneumoniae Affects Endothelial Cell Migration in Microfluidic Circulation. Front Microbiol 2022; 13:852036. [PMID: 35401456 PMCID: PMC8990767 DOI: 10.3389/fmicb.2022.852036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 02/04/2022] [Indexed: 01/12/2023] Open
Abstract
Bloodstream infections caused by Streptococcus pneumoniae induce strong inflammatory and procoagulant cellular responses and affect the endothelial barrier of the vascular system. Bacterial virulence determinants, such as the cytotoxic pore-forming pneumolysin, increase the endothelial barrier permeability by inducing cell apoptosis and cell damage. As life-threatening consequences, disseminated intravascular coagulation followed by consumption coagulopathy and low blood pressure is described. With the aim to decipher the role of pneumolysin in endothelial damage and leakage of the vascular barrier in more detail, we established a chamber-separation cell migration assay (CSMA) used to illustrate endothelial wound healing upon bacterial infections. We used chambered inlets for cell cultivation, which, after removal, provide a cell-free area of 500 μm in diameter as a defined gap in primary endothelial cell layers. During the process of wound healing, the size of the cell-free area is decreasing due to cell migration and proliferation, which we quantitatively determined by microscopic live cell monitoring. In addition, differential immunofluorescence staining combined with confocal microscopy was used to morphologically characterize the effect of bacterial attachment on cell migration and the velocity of gap closure. In all assays, the presence of wild-type pneumococci significantly inhibited endothelial gap closure. Remarkably, even in the presence of pneumolysin-deficient pneumococci, cell migration was significantly retarded. Moreover, the inhibitory effect of pneumococci on the proportion of cell proliferation versus cell migration within the process of endothelial gap closure was assessed by implementation of a fluorescence-conjugated nucleoside analogon. We further combined the endothelial CSMA with a microfluidic pump system, which for the first time enabled the microscopic visualization and monitoring of endothelial gap closure in the presence of circulating bacteria at defined vascular shear stress values for up to 48 h. In accordance with our CSMA results under static conditions, the gap remained cell free in the presence of circulating pneumococci in flow. Hence, our combined endothelial cultivation technique represents a complex in vitro system, which mimics the vascular physiology as close as possible by providing essential parameters of the blood flow to gain new insights into the effect of pneumococcal infection on endothelial barrier integrity in flow.
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Affiliation(s)
- Anna Kopenhagen
- Institut für Mikrobiologie, Technische Universität Braunschweig, Braunschweig, Germany
| | - Isabell Ramming
- Institut für Mikrobiologie, Technische Universität Braunschweig, Braunschweig, Germany.,Department of Infectious Diseases, Robert Koch Institute, Wernigerode, Germany
| | - Belinda Camp
- Institut für Mikrobiologie, Technische Universität Braunschweig, Braunschweig, Germany.,Department of Pneumology, University Hospital Magdeburg, Magdeburg, Germany
| | - Sven Hammerschmidt
- Institute for Genetics and Functional Genomics, Department of Molecular Genetics and Infection Biology, Universität Greifswald, Greifswald, Germany
| | - Marcus Fulde
- Institute of Microbiology and Epizootics, Department of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - Mathias Müsken
- Central Facility for Microscopy, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Michael Steinert
- Institut für Mikrobiologie, Technische Universität Braunschweig, Braunschweig, Germany.,Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Simone Bergmann
- Institut für Mikrobiologie, Technische Universität Braunschweig, Braunschweig, Germany
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6
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Blaschuk OW. Potential Therapeutic Applications of N-Cadherin Antagonists and Agonists. Front Cell Dev Biol 2022; 10:866200. [PMID: 35309924 PMCID: PMC8927039 DOI: 10.3389/fcell.2022.866200] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 02/21/2022] [Indexed: 12/31/2022] Open
Abstract
This review focuses on the cell adhesion molecule (CAM), known as neural (N)-cadherin (CDH2). The molecular basis of N-cadherin-mediated intercellular adhesion is discussed, as well as the intracellular signaling pathways regulated by this CAM. N-cadherin antagonists and agonists are then described, and several potential therapeutic applications of these intercellular adhesion modulators are considered. The usefulness of N-cadherin antagonists in treating fibrotic diseases and cancer, as well as manipulating vascular function are emphasized. Biomaterials incorporating N-cadherin modulators for tissue regeneration are also presented. N-cadherin antagonists and agonists have potential for broad utility in the treatment of numerous maladies.
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7
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Mok JH, Niu Y, Yousef A, Zhao Y, Sastry SK. A microfluidic approach for studying microcolonization of Escherichia coli O157:H7 on leaf trichome-mimicking surfaces under fluid shear stress. Biotechnol Bioeng 2022; 119:1556-1566. [PMID: 35141878 DOI: 10.1002/bit.28057] [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: 08/26/2021] [Revised: 01/17/2022] [Accepted: 01/30/2022] [Indexed: 11/11/2022]
Abstract
Escherichia coli O157:H7 have previously been associated with disease outbreaks associated with leafy green vegetables. However, the physical mechanisms that determine the spatial organization of bacteria onto leafy greens are still not clear. Microfluidics with embedded trichome-mimicking microposts were employed to investigate the role of shear flow and configuration of trichomes on E. coli O157:H7 microcolonization. We characterized the three-dimensional microcolonization of green fluorescent protein (GFP)-tagged E. coli O157:H7 using multiphoton fluorescence microscopy and compared their differences under static (no flow; incubated for 36 h at 37°C) and fluid shear conditions (750 nl/min for 36 h at 37°C). For micropatterned trichome arrays, we demonstrated that natural wax-mixed polydimethylsiloxane retains similar topographies and contact angles to the surface of trichome-bearing leafy greens. Our results showed that E. coli O157:H7 under fluid shear stress aligned their colonization parallel to the direction of flow. In a static condition, their colonization had no preferential alignment, with statistically similar angular distributions in all directions. In addition, depending on dimensions of the trichome arrays and flow conditions, different bacterial microcolonization patterns grew radially from initial attachment; they formed into filamentous structures and developed into bridges by surface hydrophobicity and flow-induced shear with a nutrient-rich medium. Collectively, these results demonstrate how the consequences of bacterial colonization in response to shear flow can affect pathogenic bacterial contamination of leafy greens and biofilm architectures.
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Affiliation(s)
- Jin Hong Mok
- Department of Food, Agricultural, and Biological Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Ye Niu
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Ahmed Yousef
- Department of Food Science and Technology, The Ohio State University, Columbus, Ohio, USA
| | - Yi Zhao
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Sudhir K Sastry
- Department of Food, Agricultural, and Biological Engineering, The Ohio State University, Columbus, Ohio, USA
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8
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Boghdady CM, Kalashnikov N, Mok S, McCaffrey L, Moraes C. Revisiting tissue tensegrity: Biomaterial-based approaches to measure forces across length scales. APL Bioeng 2021; 5:041501. [PMID: 34632250 PMCID: PMC8487350 DOI: 10.1063/5.0046093] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 09/08/2021] [Indexed: 12/18/2022] Open
Abstract
Cell-generated forces play a foundational role in tissue dynamics and homeostasis and are critically important in several biological processes, including cell migration, wound healing, morphogenesis, and cancer metastasis. Quantifying such forces in vivo is technically challenging and requires novel strategies that capture mechanical information across molecular, cellular, and tissue length scales, while allowing these studies to be performed in physiologically realistic biological models. Advanced biomaterials can be designed to non-destructively measure these stresses in vitro, and here, we review mechanical characterizations and force-sensing biomaterial-based technologies to provide insight into the mechanical nature of tissue processes. We specifically and uniquely focus on the use of these techniques to identify characteristics of cell and tissue "tensegrity:" the hierarchical and modular interplay between tension and compression that provide biological tissues with remarkable mechanical properties and behaviors. Based on these observed patterns, we highlight and discuss the emerging role of tensegrity at multiple length scales in tissue dynamics from homeostasis, to morphogenesis, to pathological dysfunction.
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Affiliation(s)
| | - Nikita Kalashnikov
- Department of Chemical Engineering, McGill University, Montréal, Québec H3A 0C5, Canada
| | - Stephanie Mok
- Department of Chemical Engineering, McGill University, Montréal, Québec H3A 0C5, Canada
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9
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Chala N, Moimas S, Giampietro C, Zhang X, Zambelli T, Exarchos V, Nazari-Shafti TZ, Poulikakos D, Ferrari A. Mechanical Fingerprint of Senescence in Endothelial Cells. NANO LETTERS 2021; 21:4911-4920. [PMID: 34081865 DOI: 10.1021/acs.nanolett.1c00064] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Endothelial senescence entails alterations of the healthy cell phenotype, which accumulate over time and contribute to cardiovascular disease. Mechanical aspects regulating cell adhesion, force generation, and the response to flow contribute to the senescence-associated drift; however, they remain largely unexplored. Here, we exploit force microscopy to resolve variations of the cell anchoring to the substrate and the tractions generated upon aging in the nanonewton (nN) range. Senescent endothelial cells display a multifold increase in the levels of basal adhesion and force generation supported by mature and strong focal adhesions. The enhanced mechanical interaction with the substrate yields static endothelial monolayers that polarize in response to flow but fail the process of coordinated cell shape remodeling and reorientation. The emerging picture indicates that senescence reinforces the local cell interaction with the substrate and may therefore prevent endothelial denudation; however, it compromises the ability to functionally adapt to the local hemodynamic conditions.
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Affiliation(s)
- Nafsika Chala
- Laboratory of Thermodynamics in Emerging Technologies, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092 Zürich, Switzerland
| | - Silvia Moimas
- Laboratory of Thermodynamics in Emerging Technologies, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092 Zürich, Switzerland
| | - Costanza Giampietro
- Experimental Continuum Mechanics, EMPA, Swiss Federal Laboratories for Material Science and Technologies, Überlandstrasse 129, 8600 Dübendorf, Switzerland
- Institute for Mechanical Systems, Department of Mechanical and Process Engineering, ETH Zurich, Leonhardstrasse 21, 8092 Zürich, Switzerland
| | - Xinyu Zhang
- Laboratory of Biosensors and Bioelectronics, Department of Information Technology and Electrical Engineering, ETH Zurich, Gloriastrasse 35, 8092Zürich, Switzerland
| | - Tomaso Zambelli
- Laboratory of Biosensors and Bioelectronics, Department of Information Technology and Electrical Engineering, ETH Zurich, Gloriastrasse 35, 8092Zürich, Switzerland
| | - Vasileios Exarchos
- German Heart Center Berlin, Department for Cardiovascular and Thoracic Surgery, Augustenburger Platz 1, 13353 Berlin, Germany
| | - Timo Z Nazari-Shafti
- German Heart Center Berlin, Department for Cardiovascular and Thoracic Surgery, Augustenburger Platz 1, 13353 Berlin, Germany
- Berlin Institute of Health at Charité-Universitätsmedizin Berlin, Center for Regenerative Therapies, Föhrer Strasse 15, 13353 Berlin, Germany
| | - Dimos Poulikakos
- Laboratory of Thermodynamics in Emerging Technologies, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092 Zürich, Switzerland
| | - Aldo Ferrari
- Laboratory of Thermodynamics in Emerging Technologies, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092 Zürich, Switzerland
- Experimental Continuum Mechanics, EMPA, Swiss Federal Laboratories for Material Science and Technologies, Überlandstrasse 129, 8600 Dübendorf, Switzerland
- Institute for Mechanical Systems, Department of Mechanical and Process Engineering, ETH Zurich, Leonhardstrasse 21, 8092 Zürich, Switzerland
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10
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Never Change a Flowing System? The Effects of Retrograde Flow on Isolated Perfused Lungs and Vessels. Cells 2021; 10:cells10051210. [PMID: 34063473 PMCID: PMC8156646 DOI: 10.3390/cells10051210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 04/28/2021] [Accepted: 05/11/2021] [Indexed: 11/17/2022] Open
Abstract
Retrograde perfusion may occur during disease, surgery or extracorporeal circulation. While it is clear that endothelial cells sense and respond to changes in blood flow, the consequences of retrograde perfusion are only poorly defined. Similar to shear stress or disturbed flow, retrograde perfusion might result in vasomotor responses, edema formation or inflammation in and around vessels. In this study we investigated in rats the effects of retrograde perfusion in isolated systemic vessels (IPV) and in pulmonary vessels of isolated perfused lungs (IPL). Anterograde and retrograde perfusion was performed for 480 min in IPV and for 180 min in the IPL. Perfusion pressure, cytokine levels in perfusate and bronchoalveolar lavage fluid (BALF), edema formation and mRNA expression were studied. In IPV, an increased perfusion pressure and initially also increased cytokine levels were observed during retrograde perfusion. In the IPL, increased edema formation occurred, while cytokine levels were not increased, though dilution of cytokines in BALF due to pulmonary edema cannot be excluded. In conclusion, effects of flow reversal were visible immediately after initiation of retrograde perfusion. Pulmonary edema formation was the only effect of the 3 h retrograde perfusion. Therefore, further research should focus on identification of possible long-term complications of flow reversal.
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11
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Okamoto T, Park EJ, Kawamoto E, Usuda H, Wada K, Taguchi A, Shimaoka M. Endothelial connexin-integrin crosstalk in vascular inflammation. Biochim Biophys Acta Mol Basis Dis 2021; 1867:166168. [PMID: 33991620 DOI: 10.1016/j.bbadis.2021.166168] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 04/18/2021] [Accepted: 05/02/2021] [Indexed: 02/06/2023]
Abstract
Cardiovascular diseases including blood vessel disorders represent a major cause of death globally. The essential roles played by local and systemic vascular inflammation in the pathogenesis of cardiovascular diseases have been increasingly recognized. Vascular inflammation triggers the aberrant activation of endothelial cells, which leads to the functional and structural abnormalities in vascular vessels. In addition to humoral mediators such as pro-inflammatory cytokines and prostaglandins, the alteration of physical and mechanical microenvironment - including vascular stiffness and shear stress - modify the gene expression profiles and metabolic profiles of endothelial cells via mechano-transduction pathways, thereby contributing to the pathogenesis of vessel disorders. Notably, connexins and integrins crosstalk each other in response to the mechanical stress, and, thereby, play an important role in regulating the mechano-transduction of endothelial cells. Here, we provide an overview on how the inter-play between connexins and integrins in endothelial cells unfold during the mechano-transduction in vascular inflammation.
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Affiliation(s)
- Takayuki Okamoto
- Department of Pharmacology, Faculty of Medicine, Shimane University, 89-1 Enya-cho, Izumo-city, Shimane 693-8501, Japan.
| | - Eun Jeong Park
- Department of Molecular Pathobiology and Cell Adhesion Biology, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu-city, Mie 514-8507, Japan
| | - Eiji Kawamoto
- Department of Molecular Pathobiology and Cell Adhesion Biology, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu-city, Mie 514-8507, Japan; Department of Emergency and Disaster Medicine, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu-city, Mie 514-8507, Japan
| | - Haruki Usuda
- Department of Pharmacology, Faculty of Medicine, Shimane University, 89-1 Enya-cho, Izumo-city, Shimane 693-8501, Japan
| | - Koichiro Wada
- Department of Pharmacology, Faculty of Medicine, Shimane University, 89-1 Enya-cho, Izumo-city, Shimane 693-8501, Japan
| | - Akihiko Taguchi
- Department of Regenerative Medicine Research, Foundation for Biomedical Research and Innovation at Kobe, 2-2 Minatojima-Minamimachi, Chuo-ku, Kobe 650-0047, Japan
| | - Motomu Shimaoka
- Department of Molecular Pathobiology and Cell Adhesion Biology, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu-city, Mie 514-8507, Japan.
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12
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Gorji A, Toh PJY, Ong HT, Toh YC, Toyama Y, Kanchanawong P. Enhancement of Endothelialization by Topographical Features Is Mediated by PTP1B-Dependent Endothelial Adherens Junctions Remodeling. ACS Biomater Sci Eng 2021; 7:2661-2675. [PMID: 33942605 DOI: 10.1021/acsbiomaterials.1c00251] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Endothelial Cells (ECs) form cohesive cellular lining of the vasculature and play essential roles in both developmental processes and pathological conditions. Collective migration and proliferation of endothelial cells (ECs) are key processes underlying endothelialization of vessels as well as vascular graft, but the complex interplay of mechanical and biochemical signals regulating these processes are still not fully elucidated. While surface topography and biochemical modifications have been used to enhance endothelialization in vitro, thus far such single-modality modifications have met with limited success. As combination therapy that utilizes multiple modalities has shown improvement in addressing various intractable and complex biomedical conditions, here, we explore a combined strategy that utilizes topographical features in conjunction with pharmacological perturbations. We characterized EC behaviors in response to micrometer-scale grating topography in concert with pharmacological perturbations of endothelial adherens junctions (EAJ) regulators. We found that the protein tyrosine phosphatase, PTP1B, serves as a potent regulator of EAJ stability, with PTP1B inhibition synergizing with grating topographies to modulate EAJ rearrangement, thereby augmenting global EC monolayer sheet orientation, proliferation, connectivity, and collective cell migration. Our data delineates the crosstalk between cell-ECM topography sensing and cell-cell junction integrity maintenance and suggests that the combined use of grating topography and PTP1B inhibitor could be a promising strategy for promoting collective EC migration and proliferation.
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Affiliation(s)
- Azita Gorji
- Mechanobiology Institute, National University of Singapore, 117411 Republic of Singapore.,Institut Curie, Laboratoire Physico Chimie Curie, Institut Pierre-Gilles de Gennes, CNRS UMR168, Paris 75005, France
| | - Pearlyn Jia Ying Toh
- Mechanobiology Institute, National University of Singapore, 117411 Republic of Singapore
| | - Hui Ting Ong
- Mechanobiology Institute, National University of Singapore, 117411 Republic of Singapore
| | - Yi-Chin Toh
- Department of Biomedical Engineering, National University of Singapore, 117583 Republic of Singapore.,Institute for Health Innovation and Technology, National University of Singapore, 117599 Republic of Singapore.,The N.1 Institute for Health, National University of Singapore, 117456, Republic of Singapore.,NUS Tissue Engineering Programme, National University of Singapore, 117456, Republic of Singapore
| | - Yusuke Toyama
- Mechanobiology Institute, National University of Singapore, 117411 Republic of Singapore.,Department of Biological Sciences, National University of Singapore, 117558, Republic of Singapore
| | - Pakorn Kanchanawong
- Mechanobiology Institute, National University of Singapore, 117411 Republic of Singapore.,Department of Biomedical Engineering, National University of Singapore, 117583 Republic of Singapore
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13
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Bouhrira N, DeOre BJ, Galie PA. Implementation and characterization of a physiologically relevant flow waveform in a 3D microfluidic model of the blood-brain barrier. Biotechnol Bioeng 2021; 118:2411-2421. [PMID: 33615435 DOI: 10.1002/bit.27719] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 02/03/2021] [Accepted: 02/14/2021] [Indexed: 01/16/2023]
Abstract
Previous in vitro studies interrogating the endothelial response to physiologically relevant flow regimes require specialized pumps to deliver time-dependent waveforms that imitate in vivo blood flow. The aim of this study is to create a low-cost and broadly adaptable approach to mimic physiological flow, and then use this system to characterize the effect of flow separation on velocity and shear stress profiles in a three-dimensional (3D) topology. The flow apparatus incorporates a programmable linear actuator that superposes oscillations on a constant mean flow driven by a peristaltic pump to emulate flow in the carotid artery. The flow is perfused through a 3D in vitro model of the blood-brain barrier designed to induce separated flow. Experimental flow patterns measured by microparticle image velocimetry and modeled by computational fluid dynamics reveal periodic changes in the instantaneous shear stress along the channel wall. Moreover, the time-dependent flow causes periodic flow separation zones, resulting in variable reattachment points during the cycle. The effects of these complex flow regimes are assessed by evaluating the integrity of the in vitro blood-brain barrier model. Permeability assays and immunostaining for proteins associated with tight junctions reveal barrier breakdown in the region of disturbed flow. In conclusion, the flow system described here creates complex, physiologically relevant flow profiles that provide deeper insight into the fluid dynamics of separated flow and pave the way for future studies interrogating the cellular response to complex flow regimes.
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Affiliation(s)
- Nesrine Bouhrira
- Department of Biomedical Engineering, Rowan University, Glassboro, New Jersey, USA
| | - Brandon J DeOre
- Department of Biomedical Engineering, Rowan University, Glassboro, New Jersey, USA
| | - Peter A Galie
- Department of Biomedical Engineering, Rowan University, Glassboro, New Jersey, USA
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14
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Gordon E, Schimmel L, Frye M. The Importance of Mechanical Forces for in vitro Endothelial Cell Biology. Front Physiol 2020; 11:684. [PMID: 32625119 PMCID: PMC7314997 DOI: 10.3389/fphys.2020.00684] [Citation(s) in RCA: 81] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 05/26/2020] [Indexed: 12/12/2022] Open
Abstract
Blood and lymphatic vessels are lined by endothelial cells which constantly interact with their luminal and abluminal extracellular environments. These interactions confer physical forces on the endothelium, such as shear stress, stretch and stiffness, to mediate biological responses. These physical forces are often altered during disease, driving abnormal endothelial cell behavior and pathology. Therefore, it is critical that we understand the mechanisms by which endothelial cells respond to physical forces. Traditionally, endothelial cells in culture are grown in the absence of flow on stiff substrates such as plastic or glass. These cells are not subjected to the physical forces that endothelial cells endure in vivo, thus the results of these experiments often do not mimic those observed in the body. The field of vascular biology now realize that an intricate analysis of endothelial signaling mechanisms requires complex in vitro systems to mimic in vivo conditions. Here, we will review what is known about the mechanical forces that guide endothelial cell behavior and then discuss the advancements in endothelial cell culture models designed to better mimic the in vivo vascular microenvironment. A wider application of these technologies will provide more biologically relevant information from cultured cells which will be reproducible to conditions found in the body.
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Affiliation(s)
- Emma Gordon
- Division of Cell and Developmental Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, Australia
| | - Lilian Schimmel
- Division of Cell and Developmental Biology, Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD, Australia
| | - Maike Frye
- Institute of Clinical Chemistry and Laboratory Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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15
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Obenaus AM, Mollica MY, Sniadecki NJ. (De)form and Function: Measuring Cellular Forces with Deformable Materials and Deformable Structures. Adv Healthc Mater 2020; 9:e1901454. [PMID: 31951099 PMCID: PMC7274881 DOI: 10.1002/adhm.201901454] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 12/04/2019] [Indexed: 12/29/2022]
Abstract
The ability for biological cells to produce mechanical forces is important for the development, function, and homeostasis of tissue. The measurement of cellular forces is not a straightforward task because individual cells are microscopic in size and the forces they produce are at the nanonewton scale. Consequently, studies in cell mechanics rely on advanced biomaterials or flexible structures that permit one to infer these forces by the deformation they impart on the material or structure. Herein, the scientific progression on the use of deformable materials and deformable structures to measure cellular forces are reviewed. The findings and insights made possible with these approaches in the field of cell mechanics are summarized.
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Affiliation(s)
- Ava M Obenaus
- Department of Mechanical Engineering, University of Washington, Seattle, WA, 98195, USA
| | - Molly Y Mollica
- Department of Bioengineering, University of Washington, Seattle, WA, 98195, USA
| | - Nathan J Sniadecki
- Department of Mechanical Engineering, University of Washington, Seattle, WA, 98195, USA
- Department of Bioengineering, University of Washington, Seattle, WA, 98195, USA
- Institute for Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA, 98195, USA
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16
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Inglebert M, Locatelli L, Tsvirkun D, Sinha P, Maier JA, Misbah C, Bureau L. The effect of shear stress reduction on endothelial cells: A microfluidic study of the actin cytoskeleton. BIOMICROFLUIDICS 2020; 14:024115. [PMID: 32341726 PMCID: PMC7176460 DOI: 10.1063/1.5143391] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Accepted: 04/06/2020] [Indexed: 05/05/2023]
Abstract
Reduced blood flow, as occurring in ischemia or resulting from exposure to microgravity such as encountered in space flights, induces a decrease in the level of shear stress sensed by endothelial cells forming the inner part of blood vessels. In the present study, we use a microvasculature-on-a-chip device in order to investigate in vitro the effect of such a reduction in shear stress on shear-adapted endothelial cells. We find that, within 1 h of exposition to reduced wall shear stress, human umbilical vein endothelial cells undergo reorganization of their actin skeleton with a decrease in the number of stress fibers and actin being recruited into the cells' peripheral band, indicating a fairly fast change in the cells' phenotype due to altered flow.
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Affiliation(s)
| | - Laura Locatelli
- Dept. Biomedical and Clinical Sciences L. Sacco, Univ. di Milano, Milano I-20157, Italy
| | | | - Priti Sinha
- Univ. Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France
| | - Jeanette A Maier
- Dept. Biomedical and Clinical Sciences L. Sacco, Univ. di Milano, Milano I-20157, Italy
| | - Chaouqi Misbah
- Univ. Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France
| | - Lionel Bureau
- Univ. Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France
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17
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Bouhrira N, DeOre BJ, Sazer DW, Chiaradia Z, Miller JS, Galie PA. Disturbed flow disrupts the blood-brain barrier in a 3D bifurcation model. Biofabrication 2020; 12:025020. [DOI: 10.1088/1758-5090/ab5898] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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18
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Paddillaya N, Mishra A, Kondaiah P, Pullarkat P, Menon GI, Gundiah N. Biophysics of Cell-Substrate Interactions Under Shear. Front Cell Dev Biol 2019; 7:251. [PMID: 31781558 PMCID: PMC6857480 DOI: 10.3389/fcell.2019.00251] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Accepted: 10/10/2019] [Indexed: 12/31/2022] Open
Abstract
Cells adhere to substrates through mechanosensitive focal adhesion complexes. Measurements that probe how cells detach from substrates when they experience an applied force connect molecular-scale aspects of cell adhesion with the biophysical properties of adherent cells. Such forces can be applied through shear devices that flow fluid in a controlled manner across cells. The signaling pathways associated with focal adhesions, in particular those that involve integrins and receptor tyrosine kinases, are complex, receiving mechano-chemical feedback from the sensing of substrate stiffness as well as of external forces. This article reviews the signaling processes involved in mechanosensing and mechanotransduction during cell-substrate interactions, describing the role such signaling plays in cancer metastasis. We examine some recent progress in quantifying the strength of these interactions, describing a novel fluid shear device that allows for the visualization of the cell and its sub-cellular structures under a shear flow. We also summarize related results from a biophysical model for cellular de-adhesion induced by applied forces. Quantifying cell-substrate adhesions under shear should aid in the development of mechano-diagnostic techniques for diseases in which cell-adhesion is mis-regulated, such as cancers.
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Affiliation(s)
- Neha Paddillaya
- Centre for Biosystems Science and Engineering, Indian Institute of Science, Bangalore, India
| | - Ashish Mishra
- Soft Condensed Matter Group, Raman Research Institute, Bangalore, India
| | - Paturu Kondaiah
- Department of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore, India
| | - Pramod Pullarkat
- Soft Condensed Matter Group, Raman Research Institute, Bangalore, India
| | - Gautam I Menon
- The Institute of Mathematical Sciences, Chennai, India.,Homi Bhabha National Institute, Mumbai, India.,Department of Physics, Ashoka University, Sonepat, India
| | - Namrata Gundiah
- Centre for Biosystems Science and Engineering, Indian Institute of Science, Bangalore, India.,Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India
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19
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Bajpai A, Tong J, Qian W, Peng Y, Chen W. The Interplay Between Cell-Cell and Cell-Matrix Forces Regulates Cell Migration Dynamics. Biophys J 2019; 117:1795-1804. [PMID: 31706566 DOI: 10.1016/j.bpj.2019.10.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 09/18/2019] [Accepted: 10/08/2019] [Indexed: 12/18/2022] Open
Abstract
Cells in vivo encounter and exert forces as they interact with the extracellular matrix (ECM) and neighboring cells during migration. These mechanical forces play crucial roles in regulating cell migratory behaviors. Although a variety of studies have focused on describing single-cell or the collective cell migration behaviors, a fully mechanistic understanding of how the cell-cell (intercellular) and cell-ECM (extracellular) traction forces individually and cooperatively regulate single-cell migration and coordinate multicellular movement in a cellular monolayer is still lacking. Here, we developed an integrated experimental and analytical system to examine both the intercellular and extracellular traction forces acting on individual cells within an endothelial cell colony as well as their roles in guiding cell migratory behaviors (i.e., cell translation and rotation). Combined with force, multipole, and moment analysis, our results revealed that traction force dominates in regulating cell active translation, whereas intercellular force actively modulates cell rotation. Our findings advance the understanding of the intricacies of cell-cell and cell-ECM forces in regulating cellular migratory behaviors that occur during the monolayer development and may yield deeper insights into the single-cell dynamic behaviors during tissue development, embryogenesis, and wound healing.
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Affiliation(s)
| | - Jie Tong
- Department of Mechanical and Aerospace Engineering
| | - Weiyi Qian
- Department of Mechanical and Aerospace Engineering
| | - Yansong Peng
- Department of Mechanical and Aerospace Engineering
| | - Weiqiang Chen
- Department of Mechanical and Aerospace Engineering; Department of Biomedical Engineering, New York University, Brooklyn, New York.
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20
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Jung WH, Elawad K, Kang SH, Chen Y. Cell-Cell Adhesion and Myosin Activity Regulate Cortical Actin Assembly in Mammary Gland Epithelium on Concaved Surface. Cells 2019; 8:cells8080813. [PMID: 31382444 PMCID: PMC6721614 DOI: 10.3390/cells8080813] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 07/30/2019] [Accepted: 08/01/2019] [Indexed: 12/13/2022] Open
Abstract
It has been demonstrated that geometry can affect cell behaviors. Though curvature-sensitive proteins at the nanoscale are studied, it is unclear how cells sense curvature at the cellular and multicellular levels. To characterize and determine the mechanisms of curvature-dependent cell behaviors, we grow cells on open channels of the 60-µm radius. We found that cortical F-actin is 1.2-fold more enriched in epithelial cells grown on the curved surface compared to the flat control. We observed that myosin activity is required to promote cortical F-actin formation. Furthermore, cell–cell contact was shown to be indispensable for curvature-dependent cortical actin assembly. Our results indicate that the actomyosin network coupled with adherens junctions is involved in curvature-sensing at the multi-cellular level.
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Affiliation(s)
- Wei-Hung Jung
- Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
- The Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA
- Center for Cell Dynamics, Johns Hopkins University, Baltimore, MD 21205, USA
| | - Khalid Elawad
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Sung Hoon Kang
- Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
- The Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Yun Chen
- Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA.
- The Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD 21218, USA.
- Center for Cell Dynamics, Johns Hopkins University, Baltimore, MD 21205, USA.
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21
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Krabbe J, Ruske N, Kanzler S, Reiss LK, Ludwig A, Uhlig S, Martin C. Retrograde perfusion in isolated perfused mouse lungs-Feasibility and effects on cytokine levels and pulmonary oedema formation. Basic Clin Pharmacol Toxicol 2019; 125:279-288. [PMID: 30925204 DOI: 10.1111/bcpt.13236] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Accepted: 03/22/2019] [Indexed: 01/20/2023]
Abstract
Retrograde lung vascular perfusion can appear in high-risk surgeries. The present report is the first to study long-term retrograde perfusion of isolated perfused mouse lungs (IPLs) and to use the tyrosine kinase ephB4 and its ligand ephrinB2 as potential markers for acute lung injury. Mouse lungs were subjected to anterograde or retrograde perfusion with normal-pressure ventilation (NV) or high-pressure ventilation (=overventilation, OV) for 4 hours. Outcome parameters were cytokine, ephrinB2 and ephB4 levels in perfusate samples and bronchoalveolar lavage (BAL), and the wet-to-dry ratio. Anterograde perfusion was feasible for 4 hours, while lungs receiving retrograde perfusion presented considerable collapse rates. Retrograde perfusion resulted in an increased wet-to-dry ratio when combined with high-pressure ventilation; other physiological parameters were not affected. Cytokine levels in BAL and perfusate, as well as levels of soluble ephB4 in BAL were increased in OV, while soluble ephrinB2 BAL levels were increased in retrograde perfusion. BAL levels of ephrinB2 and ephB4 were also determined in vivo, including mice ventilated for 7 hours with normal-volume ventilation (NVV) or high-volume ventilation (HVV) with increased levels of ephB4 in HVV BAL compared to NVV. Retrograde perfusion in IPL is limited as a routine method to investigate effects due to collapse for yet unclear reasons. If successful, retrograde perfusion has an influence on pulmonary oedema formation. In BAL, ephrinB2 seems to be up-regulated by flow reversal, while ephB4 is a marker for acute lung injury.
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Affiliation(s)
- Julia Krabbe
- Medical Faculty, Institute of Pharmacology and Toxicology, RWTH Aachen University, Aachen, Germany.,Medical Faculty, Institute of Occupational, Social and Environmental Medicine, RWTH Aachen University, Aachen, Germany
| | - Nadine Ruske
- Medical Faculty, Institute of Pharmacology and Toxicology, RWTH Aachen University, Aachen, Germany
| | - Stephanie Kanzler
- Medical Faculty, Institute of Pharmacology and Toxicology, RWTH Aachen University, Aachen, Germany
| | - Lucy Kathleen Reiss
- Medical Faculty, Institute of Pharmacology and Toxicology, RWTH Aachen University, Aachen, Germany
| | - Andreas Ludwig
- Medical Faculty, Institute of Pharmacology and Toxicology, RWTH Aachen University, Aachen, Germany
| | - Stefan Uhlig
- Medical Faculty, Institute of Pharmacology and Toxicology, RWTH Aachen University, Aachen, Germany
| | - Christian Martin
- Medical Faculty, Institute of Pharmacology and Toxicology, RWTH Aachen University, Aachen, Germany
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22
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Boldock L, Wittkowske C, Perrault CM. Microfluidic traction force microscopy to study mechanotransduction in angiogenesis. Microcirculation 2017; 24. [DOI: 10.1111/micc.12361] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 01/31/2017] [Indexed: 12/22/2022]
Affiliation(s)
- Luke Boldock
- Department of Mechanical Engineering and INSIGNEO Institute for in Silico Medicine; University of Sheffield; Sheffield UK
| | - Claudia Wittkowske
- Department of Mechanical Engineering and INSIGNEO Institute for in Silico Medicine; University of Sheffield; Sheffield UK
| | - Cecile M. Perrault
- Department of Mechanical Engineering and INSIGNEO Institute for in Silico Medicine; University of Sheffield; Sheffield UK
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23
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Chistiakov DA, Orekhov AN, Bobryshev YV. Effects of shear stress on endothelial cells: go with the flow. Acta Physiol (Oxf) 2017; 219:382-408. [PMID: 27246807 DOI: 10.1111/apha.12725] [Citation(s) in RCA: 261] [Impact Index Per Article: 37.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Revised: 02/17/2016] [Accepted: 05/30/2016] [Indexed: 12/11/2022]
Abstract
Haemodynamic forces influence the functional properties of vascular endothelium. Endothelial cells (ECs) have a variety of receptors, which sense flow and transmit mechanical signals through mechanosensitive signalling pathways to recipient molecules that lead to phenotypic and functional changes. Arterial architecture varies greatly exhibiting bifurcations, branch points and curved regions, which are exposed to various flow patterns. Clinical studies showed that atherosclerotic plaques develop preferentially at arterial branches and curvatures, that is in the regions exposed to disturbed flow and shear stress. In the atheroprone regions, the endothelium has a proinflammatory phenotype associated with low nitric oxide production, reduced barrier function and increased proadhesive, procoagulant and proproliferative properties. Atheroresistant regions are exposed to laminar flow and high shear stress that induce prosurvival antioxidant signals and maintain the quiescent phenotype in ECs. Indeed, various flow patterns contribute to phenotypic and functional heterogeneity of arterial endothelium whose response to proatherogenic stimuli is differentiated. This may explain the preferential development of endothelial dysfunction in arterial sites with disturbed flow.
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Affiliation(s)
- D. A. Chistiakov
- Department of Medical Nanobiotechnology; Pirogov Russian State Medical University; Moscow Russia
| | - A. N. Orekhov
- Institute of General Pathology and Pathophysiology; Russian Academy of Medical Sciences; Moscow Russia
- Institute for Atherosclerosis Research; Skolkovo Innovative Center; Moscow Russia
- Department of Biophysics; Biological Faculty; Moscow State University; Moscow Russia
| | - Y. V. Bobryshev
- Institute of General Pathology and Pathophysiology; Russian Academy of Medical Sciences; Moscow Russia
- Faculty of Medicine and St Vincent's Centre for Applied Medical Research; University of New South Wales; Sydney NSW Australia
- School of Medicine; University of Western Sydney; Campbelltown NSW Australia
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24
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Zhang Y, Liao B, Li M, Cheng M, Fu Y, Liu Q, Chen Q, Liu H, Fang Y, Zhang G, Yu F. Shear stress regulates endothelial cell function through SRB1-eNOS signaling pathway. Cardiovasc Ther 2016; 34:308-13. [PMID: 27225585 DOI: 10.1111/1755-5922.12199] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Affiliation(s)
- Ying Zhang
- Department of Anesthesiology; Traditional Chinese Medicine Hospital of Luzhou Medical College; Luzhou Sichuan Province China
| | - Bin Liao
- The Affiliated Hospital of Luzhou Medical College; Cardiothoracic Surgery; Luzhou Sichuan Province China
- Institute of Cardiovascular Research; Luzhou Medical College; Luzhou Sichuan Province China
| | - Miaoling Li
- Institute of Cardiovascular Research; Luzhou Medical College; Luzhou Sichuan Province China
- Key Laboratory of Medical Electrophysiology; Ministry of Education of China; Luzhou Sichuan Province China
| | - Min Cheng
- Medicine Research Center; Weifang Medical University; Weifang Shandong China
| | - Yong Fu
- The Affiliated Hospital of Luzhou Medical College; Cardiothoracic Surgery; Luzhou Sichuan Province China
| | - Qing Liu
- Department of Anesthesiology; Traditional Chinese Medicine Hospital of Luzhou Medical College; Luzhou Sichuan Province China
| | - Qi Chen
- Department of Anesthesiology; Traditional Chinese Medicine Hospital of Luzhou Medical College; Luzhou Sichuan Province China
| | - Hongduan Liu
- The Affiliated Hospital of Luzhou Medical College; Cardiothoracic Surgery; Luzhou Sichuan Province China
| | - Yibing Fang
- The Affiliated Hospital of Luzhou Medical College; Cardiothoracic Surgery; Luzhou Sichuan Province China
| | - Gen Zhang
- The Affiliated Hospital of Luzhou Medical College; Cardiothoracic Surgery; Luzhou Sichuan Province China
| | - Fengxu Yu
- The Affiliated Hospital of Luzhou Medical College; Cardiothoracic Surgery; Luzhou Sichuan Province China
- Institute of Cardiovascular Research; Luzhou Medical College; Luzhou Sichuan Province China
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25
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Yurdagul A, Orr AW. Blood Brothers: Hemodynamics and Cell-Matrix Interactions in Endothelial Function. Antioxid Redox Signal 2016; 25:415-34. [PMID: 26715135 PMCID: PMC5011636 DOI: 10.1089/ars.2015.6525] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Revised: 11/25/2015] [Accepted: 12/23/2015] [Indexed: 12/29/2022]
Abstract
SIGNIFICANCE Alterations in endothelial function contribute to a variety of vascular diseases. In pathological conditions, the endothelium shows a reduced ability to regulate vasodilation (endothelial dysfunction) and a conversion toward a proinflammatory and leaky phenotype (endothelial activation). At the interface between the vessel wall and blood, the endothelium exists in a complex microenvironment and must translate changes in these environmental signals to alterations in vessel function. Mechanical stimulation and endothelial cell interactions with the vascular matrix, as well as a host of soluble factors, coordinately contribute to this dynamic regulation. RECENT ADVANCES Blood hemodynamics play an established role in the regulation of endothelial function. However, a growing body of work suggests that subendothelial matrix composition similarly and coordinately regulates endothelial cell phenotype such that blood flow affects matrix remodeling, which affects the endothelial response to flow. CRITICAL ISSUES Hemodynamics and soluble factors likely affect endothelial matrix remodeling through multiple mechanisms, including transforming growth factor β signaling and alterations in cell-matrix receptors, such as the integrins. Likewise, differential integrin signaling following matrix remodeling appears to regulate several key flow-induced responses, including nitric oxide production, regulation of oxidant stress, and activation of proinflammatory signaling and gene expression. Microvascular remodeling responses, such as angiogenesis and arteriogenesis, may also show coordinated regulation by flow and matrix. FUTURE DIRECTIONS Identifying the mechanisms regulating the dynamic interplay between hemodynamics and matrix remodeling and their contribution to the pathogenesis of cardiovascular disease remains an important research area with therapeutic implications across a variety of conditions. Antioxid. Redox Signal. 25, 415-434.
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Affiliation(s)
- Arif Yurdagul
- Department of Cell Biology and Anatomy, Louisiana State University Health Sciences Center–Shreveport, Shreveport, Louisiana
| | - A. Wayne Orr
- Department of Cell Biology and Anatomy, Louisiana State University Health Sciences Center–Shreveport, Shreveport, Louisiana
- Department of Pathology and Translational Pathobiology, Louisiana State University Health Sciences Center–Shreveport, Shreveport, Louisiana
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26
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Warren KM, Islam MM, LeDuc PR, Steward R. 2D and 3D Mechanobiology in Human and Nonhuman Systems. ACS APPLIED MATERIALS & INTERFACES 2016; 8:21869-21882. [PMID: 27214883 DOI: 10.1021/acsami.5b12064] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Mechanobiology involves the investigation of mechanical forces and their effect on the development, physiology, and pathology of biological systems. The human body has garnered much attention from many groups in the field, as mechanical forces have been shown to influence almost all aspects of human life ranging from breathing to cancer metastasis. Beyond being influential in human systems, mechanical forces have also been shown to impact nonhuman systems such as algae and zebrafish. Studies of nonhuman and human systems at the cellular level have primarily been done in two-dimensional (2D) environments, but most of these systems reside in three-dimensional (3D) environments. Furthermore, outcomes obtained from 3D studies are often quite different than those from 2D studies. We present here an overview of a select group of human and nonhuman systems in 2D and 3D environments. We also highlight mechanobiological approaches and their respective implications for human and nonhuman physiology.
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Affiliation(s)
- Kristin M Warren
- Departments of Mechanical Engineering, Biomedical Engineering, Computational Biology, and Biological Sciences, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Md Mydul Islam
- Department of Mechanical and Aerospace Engineering and Burnett School of Biomedical Sciences, University of Central Florida , Orlando, Florida 32827, United States
| | - Philip R LeDuc
- Departments of Mechanical Engineering, Biomedical Engineering, Computational Biology, and Biological Sciences, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Robert Steward
- Department of Mechanical and Aerospace Engineering and Burnett School of Biomedical Sciences, University of Central Florida , Orlando, Florida 32827, United States
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27
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Perrault CM, Brugues A, Bazellieres E, Ricco P, Lacroix D, Trepat X. Traction Forces of Endothelial Cells under Slow Shear Flow. Biophys J 2016; 109:1533-6. [PMID: 26488643 DOI: 10.1016/j.bpj.2015.08.036] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 07/31/2015] [Accepted: 08/11/2015] [Indexed: 10/22/2022] Open
Abstract
Endothelial cells are constantly exposed to fluid shear stresses that regulate vascular morphogenesis, homeostasis, and disease. The mechanical responses of endothelial cells to relatively high shear flow such as that characteristic of arterial circulation has been extensively studied. Much less is known about the responses of endothelial cells to slow shear flow such as that characteristic of venous circulation, early angiogenesis, atherosclerosis, intracranial aneurysm, or interstitial flow. Here we used a novel, to our knowledge, microfluidic technique to measure traction forces exerted by confluent vascular endothelial cell monolayers under slow shear flow. We found that cells respond to flow with rapid and pronounced increases in traction forces and cell-cell stresses. These responses are reversible in time and do not involve reorientation of the cell body. Traction maps reveal that local cell responses to slow shear flow are highly heterogeneous in magnitude and sign. Our findings unveil a low-flow regime in which endothelial cell mechanics is acutely responsive to shear stress.
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Affiliation(s)
- Cecile M Perrault
- Institute for In Silico Medicine, University of Sheffield, Sheffield, United Kingdom; Department of Mechanical Engineering, University of Sheffield, Sheffield, United Kingdom; Institute for Bioengineering of Catalonia, Barcelona, Spain.
| | - Agusti Brugues
- Institute for Bioengineering of Catalonia, Barcelona, Spain
| | | | - Pierre Ricco
- Department of Mechanical Engineering, University of Sheffield, Sheffield, United Kingdom
| | - Damien Lacroix
- Institute for In Silico Medicine, University of Sheffield, Sheffield, United Kingdom; Department of Mechanical Engineering, University of Sheffield, Sheffield, United Kingdom; Institute for Bioengineering of Catalonia, Barcelona, Spain
| | - Xavier Trepat
- Institute for Bioengineering of Catalonia, Barcelona, Spain; Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain; Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina, Barcelona, Spain; Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain
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Valent ET, van Nieuw Amerongen GP, van Hinsbergh VWM, Hordijk PL. Traction force dynamics predict gap formation in activated endothelium. Exp Cell Res 2016; 347:161-170. [PMID: 27498166 DOI: 10.1016/j.yexcr.2016.07.029] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 07/29/2016] [Accepted: 07/31/2016] [Indexed: 11/25/2022]
Abstract
In many pathological conditions the endothelium becomes activated and dysfunctional, resulting in hyperpermeability and plasma leakage. No specific therapies are available yet to control endothelial barrier function, which is regulated by inter-endothelial junctions and the generation of acto-myosin-based contractile forces in the context of cell-cell and cell-matrix interactions. However, the spatiotemporal distribution and stimulus-induced reorganization of these integral forces remain largely unknown. Traction force microscopy of human endothelial monolayers was used to visualize contractile forces in resting cells and during thrombin-induced hyperpermeability. Simultaneously, information about endothelial monolayer integrity, adherens junctions and cytoskeletal proteins (F-actin) were captured. This revealed a heterogeneous distribution of traction forces, with nuclear areas showing lower and cell-cell junctions higher traction forces than the whole-monolayer average. Moreover, junctional forces were asymmetrically distributed among neighboring cells. Force vector orientation analysis showed a good correlation with the alignment of F-actin and revealed contractile forces in newly formed filopodia and lamellipodia-like protrusions within the monolayer. Finally, unstable areas, showing high force fluctuations within the monolayer were prone to form inter-endothelial gaps upon stimulation with thrombin. To conclude, contractile traction forces are heterogeneously distributed within endothelial monolayers and force instability, rather than force magnitude, predicts the stimulus-induced formation of intercellular gaps.
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Affiliation(s)
- Erik T Valent
- Department of Physiology, Institute for Cardiovascular Research, VU University Medical Center, Amsterdam, The Netherlands
| | - Geerten P van Nieuw Amerongen
- Department of Physiology, Institute for Cardiovascular Research, VU University Medical Center, Amsterdam, The Netherlands
| | - Victor W M van Hinsbergh
- Department of Physiology, Institute for Cardiovascular Research, VU University Medical Center, Amsterdam, The Netherlands
| | - Peter L Hordijk
- Department of Physiology, Institute for Cardiovascular Research, VU University Medical Center, Amsterdam, The Netherlands.
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29
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Kannan N, Tang VW. Synaptopodin couples epithelial contractility to α-actinin-4-dependent junction maturation. J Cell Biol 2016; 211:407-34. [PMID: 26504173 PMCID: PMC4621826 DOI: 10.1083/jcb.201412003] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
A novel tension-sensitive junctional protein, synaptopodin, can relay biophysical input from cellular actomyosin contractility to induce biochemical changes at cell–cell contacts, resulting in structural reorganization of the junctional complex and epithelial barrier maturation. The epithelial junction experiences mechanical force exerted by endogenous actomyosin activities and from interactions with neighboring cells. We hypothesize that tension generated at cell–cell adhesive contacts contributes to the maturation and assembly of the junctional complex. To test our hypothesis, we used a hydraulic apparatus that can apply mechanical force to intercellular junction in a confluent monolayer of cells. We found that mechanical force induces α-actinin-4 and actin accumulation at the cell junction in a time- and tension-dependent manner during junction development. Intercellular tension also induces α-actinin-4–dependent recruitment of vinculin to the cell junction. In addition, we have identified a tension-sensitive upstream regulator of α-actinin-4 as synaptopodin. Synaptopodin forms a complex containing α-actinin-4 and β-catenin and interacts with myosin II, indicating that it can physically link adhesion molecules to the cellular contractile apparatus. Synaptopodin depletion prevents junctional accumulation of α-actinin-4, vinculin, and actin. Knockdown of synaptopodin and α-actinin-4 decreases the strength of cell–cell adhesion, reduces the monolayer permeability barrier, and compromises cellular contractility. Our findings underscore the complexity of junction development and implicate a control process via tension-induced sequential incorporation of junctional components.
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Affiliation(s)
- Nivetha Kannan
- Program in Global Public Health, University of Illinois, Urbana-Champaign, Champaign, IL 61801
| | - Vivian W Tang
- Department of Cell and Developmental Biology, University of Illinois, Urbana-Champaign, Champaign, IL 61801
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30
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Ramadan Q, Jing L. Characterization of tight junction disruption and immune response modulation in a miniaturized Caco-2/U937 coculture-based in vitro model of the human intestinal barrier. Biomed Microdevices 2016; 18:11. [DOI: 10.1007/s10544-016-0035-5] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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31
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Chistiakov DA, Orekhov AN, Bobryshev YV. Endothelial Barrier and Its Abnormalities in Cardiovascular Disease. Front Physiol 2015; 6:365. [PMID: 26696899 PMCID: PMC4673665 DOI: 10.3389/fphys.2015.00365] [Citation(s) in RCA: 168] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Accepted: 11/16/2015] [Indexed: 01/15/2023] Open
Abstract
Endothelial cells (ECs) form a unique barrier between the vascular lumen and the vascular wall. In addition, the endothelium is highly metabolically active. In cardiovascular disease such as atherosclerosis and hypertension, normal endothelial function could be severely disturbed leading to endothelial dysfunction that then could progress to complete and irreversible loss of EC functionality and contribute to entire vascular dysfunction. Proatherogenic stimuli such as diabetes, dyslipidemia, and oxidative stress could initiate endothelial dysfunction and in turn vascular dysfunction and lead to the development of atherosclerotic arterial disease, a background for multiple cardiovascular disorders including coronary artery disease, acute coronary syndrome, stroke, and thrombosis. Intercellular junctions between ECs mediate the barrier function. Proinflammatory stimuli destabilize the junctions causing the disruption of the endothelial barrier and increased junctional permeability. This facilitates transendothelial migration of immune cells to the arterial intima and induction of vascular inflammation. Proatherogenic stimuli attack endothelial microtubule function that is regulated by acetylation of tubulin, an essential microtubular constituent. Chemical modification of tubulin caused by cardiometabolic risk factors and oxidative stress leads to reorganization of endothelial microtubules. These changes destabilize vascular integrity and increase permeability, which finally results in increasing cardiovascular risk.
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Affiliation(s)
- Dimitry A Chistiakov
- Division of Laboratory Medicine, Department of Molecular Genetic Diagnostics and Cell Biology, Research Center for Children's Health, Institute of Pediatrics Moscow, Russia
| | - Alexander N Orekhov
- Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, Russian Academy of Sciences Moscow, Russia ; Department of Biophysics, Biological Faculty, Moscow State University Moscow, Russia ; Institute for Atherosclerosis Research, Skolkovo Innovation Center Moscow, Russia
| | - Yuri V Bobryshev
- Faculty of Medicine, School of Medical Sciences, University of New South Wales Sydney, NSW, Australia ; School of Medicine, University of Western Sydney Campbelltown, NSW, Australia
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32
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Multiplexed Fluid Flow Device to Study Cellular Response to Tunable Shear Stress Gradients. Ann Biomed Eng 2015; 44:2261-72. [PMID: 26589597 DOI: 10.1007/s10439-015-1500-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Accepted: 10/31/2015] [Indexed: 02/03/2023]
Abstract
Endothelial cells (ECs) line the interior of blood and lymphatic vessels and experience spatially varying wall shear stress (WSS) as an intrinsic part of their physiological function. How ECs, and mammalian cells generally, sense spatially varying WSS remains poorly understood, due in part to a lack of convenient tools for exposing cells to spatially varying flow patterns. We built a multiplexed device, termed a 6-well impinging flow chamber, that imparts controlled WSS gradients to a six-well tissue culture plate. Using this device, we investigated the migratory response of lymphatic microvascular ECs, umbilical vein ECs, primary fibroblasts, and epithelial cells to WSS gradients on hours to days timescales. We observed that lymphatic microvascular ECs migrate upstream, against the direction of flow, a response that was unique among all the cells types investigated here. Time-lapse, live cell imaging revealed that the microtubule organizing center relocated to the upstream side of the nucleus in response to the applied WSS gradient. To further demonstrate the utility of our device, we screened for the involvement of canonical signaling pathways in mediating this upstream migratory response. These data highlight the importance of WSS magnitude and WSS spatial gradients in dictating the cellular response to fluid flow.
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33
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Micro- and nanodevices integrated with biomolecular probes. Biotechnol Adv 2015; 33:1727-43. [PMID: 26363089 PMCID: PMC4948648 DOI: 10.1016/j.biotechadv.2015.09.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Revised: 08/06/2015] [Accepted: 09/05/2015] [Indexed: 12/28/2022]
Abstract
Understanding how biomolecules, proteins and cells interact with their surroundings and other biological entities has become the fundamental design criterion for most biomedical micro- and nanodevices. Advances in biology, medicine, and nanofabrication technologies complement each other and allow us to engineer new tools based on biomolecules utilized as probes. Engineered micro/nanosystems and biomolecules in nature have remarkably robust compatibility in terms of function, size, and physical properties. This article presents the state of the art in micro- and nanoscale devices designed and fabricated with biomolecular probes as their vital constituents. General design and fabrication concepts are presented and three major platform technologies are highlighted: microcantilevers, micro/nanopillars, and microfluidics. Overview of each technology, typical fabrication details, and application areas are presented by emphasizing significant achievements, current challenges, and future opportunities.
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34
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Steucke KE, Tracy PV, Hald ES, Hall JL, Alford PW. Vascular smooth muscle cell functional contractility depends on extracellular mechanical properties. J Biomech 2015; 48:3044-51. [PMID: 26283412 DOI: 10.1016/j.jbiomech.2015.07.029] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2015] [Revised: 07/21/2015] [Accepted: 07/23/2015] [Indexed: 11/17/2022]
Abstract
Vascular smooth muscle cells' primary function is to maintain vascular homeostasis through active contraction and relaxation. In diseases such as hypertension and atherosclerosis, this function is inhibited concurrent to changes in the mechanical environment surrounding vascular smooth muscle cells. It is well established that cell function and extracellular mechanics are interconnected; variations in substrate modulus affect cell migration, proliferation, and differentiation. To date, it is unknown how the evolving extracellular mechanical environment of vascular smooth muscle cells affects their contractile function. Here, we have built upon previous vascular muscular thin film technology to develop a variable-modulus vascular muscular thin film that measures vascular tissue functional contractility on substrates with a range of pathological and physiological moduli. Using this modified vascular muscular thin film, we found that vascular smooth muscle cells generated greater stress on substrates with higher moduli compared to substrates with lower moduli. We then measured protein markers typically thought to indicate a contractile phenotype in vascular smooth muscle cells and found that phenotype is unaffected by substrate modulus. These data suggest that mechanical properties of vascular smooth muscle cells' extracellular environment directly influence their functional behavior and do so without inducing phenotype switching.
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Affiliation(s)
- Kerianne E Steucke
- Department of Biomedical Engineering, University of Minnesota - Twin Cities, Minneapolis, MN 55455, United States
| | - Paige V Tracy
- Department of Biomedical Engineering, University of Minnesota - Twin Cities, Minneapolis, MN 55455, United States
| | - Eric S Hald
- Department of Biomedical Engineering, University of Minnesota - Twin Cities, Minneapolis, MN 55455, United States
| | - Jennifer L Hall
- Division of Cardiology, Department of Medicine, University of Minnesota - Twin Cities, Minneapolis, MN 55455, United States
| | - Patrick W Alford
- Department of Biomedical Engineering, University of Minnesota - Twin Cities, Minneapolis, MN 55455, United States.
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35
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Geng Y, Wang Z. Review of cellular mechanotransduction on micropost substrates. Med Biol Eng Comput 2015; 54:249-71. [PMID: 26245253 DOI: 10.1007/s11517-015-1343-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2014] [Accepted: 07/07/2015] [Indexed: 01/09/2023]
Abstract
As physical entities, living cells can sense and respond to various stimulations within and outside the body through cellular mechanotransduction. Any deviation in cellular mechanotransduction will not only undermine the orchestrated regulation of mechanical responses, but also lead to the breakdown of their physiological function. Therefore, a quantitative study of cellular mechanotransduction needs to be conducted both in experiments and in computational simulations to investigate the underlying mechanisms of cellular mechanotransduction. In this review, we present an overview of the current knowledge and significant progress in cellular mechanotransduction via micropost substrates. In the aspect of experimental studies, we summarize significant experimental progress and place an emphasis on the coupled relationship among cellular spreading, focal adhesion and contractility as well as the influence of substrate properties on force-involved cellular behaviors. In the other aspect of computational investigations, we outline a coupled framework including the biochemically motivated stress fiber model and thermodynamically motivated adhesion model and present their predicted biomechanical responses and then compare predicted simulation results with experimental observations to further explore the mechanisms of cellular mechanotransduction. At last, we discuss the future perspectives both in experimental technologies and in computational models, as well as facing challenges in the area of cellular mechanotransduction.
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Affiliation(s)
- Yuxu Geng
- State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing, 400030, China
| | - Zhanjiang Wang
- State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing, 400030, China.
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36
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A Review of Cell Adhesion Studies for Biomedical and Biological Applications. Int J Mol Sci 2015; 16:18149-84. [PMID: 26251901 PMCID: PMC4581240 DOI: 10.3390/ijms160818149] [Citation(s) in RCA: 515] [Impact Index Per Article: 57.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2015] [Revised: 06/21/2015] [Accepted: 06/24/2015] [Indexed: 01/13/2023] Open
Abstract
Cell adhesion is essential in cell communication and regulation, and is of fundamental importance in the development and maintenance of tissues. The mechanical interactions between a cell and its extracellular matrix (ECM) can influence and control cell behavior and function. The essential function of cell adhesion has created tremendous interests in developing methods for measuring and studying cell adhesion properties. The study of cell adhesion could be categorized into cell adhesion attachment and detachment events. The study of cell adhesion has been widely explored via both events for many important purposes in cellular biology, biomedical, and engineering fields. Cell adhesion attachment and detachment events could be further grouped into the cell population and single cell approach. Various techniques to measure cell adhesion have been applied to many fields of study in order to gain understanding of cell signaling pathways, biomaterial studies for implantable sensors, artificial bone and tooth replacement, the development of tissue-on-a-chip and organ-on-a-chip in tissue engineering, the effects of biochemical treatments and environmental stimuli to the cell adhesion, the potential of drug treatments, cancer metastasis study, and the determination of the adhesion properties of normal and cancerous cells. This review discussed the overview of the available methods to study cell adhesion through attachment and detachment events.
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37
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Huveneers S, Daemen MJAP, Hordijk PL. Between Rho(k) and a hard place: the relation between vessel wall stiffness, endothelial contractility, and cardiovascular disease. Circ Res 2015; 116:895-908. [PMID: 25722443 DOI: 10.1161/circresaha.116.305720] [Citation(s) in RCA: 133] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Vascular stiffness is a mechanical property of the vessel wall that affects blood pressure, permeability, and inflammation. As a result, vascular stiffness is a key driver of (chronic) human disorders, including pulmonary arterial hypertension, kidney disease, and atherosclerosis. Responses of the endothelium to stiffening involve integration of mechanical cues from various sources, including the extracellular matrix, smooth muscle cells, and the forces that derive from shear stress of blood. This response in turn affects endothelial cell contractility, which is an important property that regulates endothelial stiffness, permeability, and leukocyte-vessel wall interactions. Moreover, endothelial stiffening reduces nitric oxide production, which promotes smooth muscle cell contraction and vasoconstriction. In fact, vessel wall stiffening, and microcirculatory endothelial dysfunction, precedes hypertension and thus underlies the development of vascular disease. Here, we review the cross talk among vessel wall stiffening, endothelial contractility, and vascular disease, which is controlled by Rho-driven actomyosin contractility and cellular mechanotransduction. In addition to discussing the various inputs and relevant molecular events in the endothelium, we address which actomyosin-regulated changes at cell adhesion complexes are genetically associated with human cardiovascular disease. Finally, we discuss recent findings that broaden therapeutic options for targeting this important mechanical signaling pathway in vascular pathogenesis.
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Affiliation(s)
- Stephan Huveneers
- From the Department of Molecular Cell Biology, Sanquin Research and Landsteiner Laboratory, Swammerdam Institute for Life Sciences (S.H., P.L.H.) and Department of Pathology (M.J.A.P.D.), Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
| | - Mat J A P Daemen
- From the Department of Molecular Cell Biology, Sanquin Research and Landsteiner Laboratory, Swammerdam Institute for Life Sciences (S.H., P.L.H.) and Department of Pathology (M.J.A.P.D.), Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Peter L Hordijk
- From the Department of Molecular Cell Biology, Sanquin Research and Landsteiner Laboratory, Swammerdam Institute for Life Sciences (S.H., P.L.H.) and Department of Pathology (M.J.A.P.D.), Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
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38
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Zhang P, Feng S, Bai H, Zeng P, Chen F, Wu C, Peng Y, Zhang Q, Zhang Q, Ye Q, Xue Q, Xu X, Song E, Song Y. Polychlorinated biphenyl quinone induces endothelial barrier dysregulation by setting the cross talk between VE-cadherin, focal adhesion, and MAPK signaling. Am J Physiol Heart Circ Physiol 2015; 308:H1205-14. [PMID: 25770237 DOI: 10.1152/ajpheart.00005.2015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Accepted: 03/09/2015] [Indexed: 12/12/2022]
Abstract
Environmental hazardous material polychlorinated biphenyl (PCB) exposure is associated with vascular endothelial dysfunction, which may increase the risk of cardiovascular diseases and cancer metastasis. Our previous studies illustrated the cytotoxic, antiproliferative, and genotoxic effects of a synthetic, quinone-type, highly reactive metabolite of PCB, 2,3,5-trichloro-6-phenyl-[1,4]benzoquinone (PCB29-pQ). Here, we used it as the model compound to investigate its effects on vascular endothelial integrity and permeability. We demonstrated that noncytotoxic doses of PCB29-pQ induced vascular endothelial (VE)-cadherin junction disassembly by increasing the phosphorylation of VE-cadherin at Y658. We also found that focal adhesion assembly was required for PCB29-pQ-induced junction breakdown. Focal adhesion site-associated actin stress fibers may serve as holding points for cytoskeletal tension to regulate the cellular contractility. PCB29-pQ exposure promoted the association of actin stress fibers with paxillin-containing focal adhesion sites and enlarged the size/number of focal adhesions. In addition, PCB29-pQ treatment induced phosphorylation of paxillin at Y118. By using pharmacological inhibition, we further demonstrated that p38 activation was necessary for paxillin phosphorylation, whereas extracellular signal-regulated kinases-1/2 activation regulated VE-cadherin phosphorylation. In conclusion, these results indicated that PCB29-pQ stimulates endothelial hyperpermeability by mediating VE-cadherin disassembly, junction breakdown, and focal adhesion formation. Intervention strategies targeting focal adhesion and MAPK signaling could be used as therapeutic approaches for preventing adverse cardiovascular health effects induced by environmental toxicants such as PCBs.
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Affiliation(s)
- Pu Zhang
- Key Laboratory of Luminescence and Real-Time Analytical Chemistry, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, China; and Department of Bioengineering, Pennsylvania State University, University Park, Pennsylvania
| | - Shan Feng
- Key Laboratory of Luminescence and Real-Time Analytical Chemistry, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, China; and
| | - Huiyuan Bai
- Key Laboratory of Luminescence and Real-Time Analytical Chemistry, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, China; and
| | - Panying Zeng
- Key Laboratory of Luminescence and Real-Time Analytical Chemistry, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, China; and
| | - Feng Chen
- Key Laboratory of Luminescence and Real-Time Analytical Chemistry, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, China; and
| | - Chengxiang Wu
- Key Laboratory of Luminescence and Real-Time Analytical Chemistry, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, China; and
| | - Yi Peng
- Key Laboratory of Luminescence and Real-Time Analytical Chemistry, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, China; and
| | - Qin Zhang
- Key Laboratory of Luminescence and Real-Time Analytical Chemistry, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, China; and
| | - Qiuyao Zhang
- Key Laboratory of Luminescence and Real-Time Analytical Chemistry, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, China; and
| | - Qichao Ye
- Key Laboratory of Luminescence and Real-Time Analytical Chemistry, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, China; and
| | - Qiang Xue
- Key Laboratory of Luminescence and Real-Time Analytical Chemistry, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, China; and
| | - Xiaoyu Xu
- Key Laboratory of Luminescence and Real-Time Analytical Chemistry, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, China; and
| | - Erqun Song
- Key Laboratory of Luminescence and Real-Time Analytical Chemistry, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, China; and
| | - Yang Song
- Key Laboratory of Luminescence and Real-Time Analytical Chemistry, Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, China; and
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39
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Galie PA, van Oosten A, Chen CS, Janmey PA. Application of multiple levels of fluid shear stress to endothelial cells plated on polyacrylamide gels. LAB ON A CHIP 2015; 15:1205-12. [PMID: 25573790 PMCID: PMC4500630 DOI: 10.1039/c4lc01236d] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Measurements of endothelial cell response to fluid shear stress have previously been performed on unphysiologically rigid substrates. We describe the design and implementation of a microfluidic device that applies discrete levels of shear stress to cells plated on hydrogel-based substrates of physiologically-relevant stiffness. The setup allows for measurements of cell morphology and inflammatory response to the combined stimuli, and identifies mechanisms by which vascular stiffening leads to pathological responses to blood flow. We found that the magnitude of shear stress required to affect endothelial cell morphology and inflammatory response depended on substrate stiffness. Endothelial cells on 100 Pa substrates demonstrate a greater increase in cell area and cortical stiffness and decrease in NF-κB nuclear translocation in response to TNF-α treatment compared to controls than cells plated on 10 kPa substrates. The response of endothelial cells on soft substrates to shear stress depends on the presence of hyaluronan (HA). These results emphasize the importance of substrate stiffness on endothelial function, and elucidate a means by which vascular stiffening in aging and disease can impact the endothelium.
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Affiliation(s)
- P A Galie
- Dept of Physiology, University of Pennsylvania, Philadelphia, PA, USA.
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40
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Steward R, Tambe D, Hardin CC, Krishnan R, Fredberg JJ. Fluid shear, intercellular stress, and endothelial cell alignment. Am J Physiol Cell Physiol 2015; 308:C657-64. [PMID: 25652451 DOI: 10.1152/ajpcell.00363.2014] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Accepted: 02/02/2015] [Indexed: 11/22/2022]
Abstract
Endothelial cell alignment along the direction of laminar fluid flow is widely understood to be a defining morphological feature of vascular homeostasis. While the role of associated signaling and structural events have been well studied, associated intercellular stresses under laminar fluid shear have remained ill-defined and the role of these stresses in the alignment process has remained obscure. To fill this gap, we report here the tractions as well as the complete in-plane intercellular stress fields measured within the human umbilical vein endothelial cell (HUVEC) monolayer subjected to a steady laminar fluid shear of 1 Pa. Tractions, intercellular stresses, as well as their time course, heterogeneity, and anisotropy, were measured using monolayer traction microscopy and monolayer stress microscopy. Prior to application of laminar fluid flow, intercellular stresses were largely tensile but fluctuated dramatically in space and in time (317 ± 122 Pa). Within 12 h of the onset of laminar fluid flow, the intercellular stresses decreased substantially but continued to fluctuate dramatically (142 ± 84 Pa). Moreover, tractions and intercellular stresses aligned strongly and promptly (within 1 h) along the direction of fluid flow, whereas the endothelial cell body aligned less strongly and substantially more slowly (12 h). Taken together, these results reveal that steady laminar fluid flow induces prompt reduction in magnitude and alignment of tractions and intercellular stress tensor components followed by the retarded elongation and alignment of the endothelial cell body. Appreciably smaller intercellular stresses supported by cell-cell junctions logically favor smaller incidence of gap formation and thus improved barrier integrity.
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Affiliation(s)
- Robert Steward
- T.H. Chan School of Public Health, Harvard University, Boston, Massachusetts
| | | | - C Corey Hardin
- Massachussets General Hospital and Harvard Medical School, Boston, Massachussets; and
| | - Ramaswamy Krishnan
- Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachussets
| | - Jeffrey J Fredberg
- T.H. Chan School of Public Health, Harvard University, Boston, Massachusetts;
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41
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Abstract
Cell adhesion to the extracellular matrix (ECM) involves integrin receptor-ligand binding and clustering to form focal adhesion (FA) complexes, which mechanically link the cell's cytoskeleton to the ECM and regulate fundamental cell signaling pathways. Although elucidation of the biochemical events in cell-matrix adhesive interactions is rapidly advancing, recent studies show that the forces underlying cell-matrix adhesive interactions are also critical to cell responses. Therefore, multiple measurement systems have been developed to quantify the spatial and temporal dynamics of cell adhesive forces, and these systems have identified how mechanical events influence cell phenotype and FA structure-function relationships under physiological and pathological settings. This review focuses on the development, methodology, and applications of measurement systems for probing (a) cell adhesion strength and (b) 2D and 3D cell traction forces.
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Cheung TM, Yan JB, Fu JJ, Huang J, Yuan F, Truskey GA. Endothelial Cell Senescence Increases Traction Forces due to Age-Associated Changes in the Glycocalyx and SIRT1. Cell Mol Bioeng 2014; 8:63-75. [PMID: 25914755 DOI: 10.1007/s12195-014-0371-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Endothelial cell (EC) aging and senescence are key events in atherogenesis and cardiovascular disease development. Age-associated changes in the local mechanical environment of blood vessels have also been linked to atherosclerosis. However, the extent to which cell senescence affects mechanical forces generated by the cell is unclear. In this study, we sought to determine whether EC senescence increases traction forces through age-associated changes in the glycocalyx and antioxidant regulator deacetylase Sirtuin1 (SIRT1), which is downregulated during aging. Traction forces were higher in cells that had undergone more population doublings and changes in traction force were associated with altered actin localization. Older cells also had increased actin filament thickness. Depletion of heparan sulfate in young ECs elevated traction forces and actin filament thickness, while addition of heparan sulfate to the surface of aged ECs by treatment with angiopoietin-1 had the opposite effect. While inhibition of SIRT1 had no significant effect on traction forces or actin organization for young cells, activation of SIRT1 did reduce traction forces and increase peripheral actin in aged ECs. These results show that EC senescence increases traction forces and alters actin localization through changes to SIRT1 and the glycocalyx.
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Affiliation(s)
- Tracy M Cheung
- Department of Biomedical Engineering Duke University Durham, NC 27708
| | - Jessica B Yan
- Department of Biomedical Engineering Duke University Durham, NC 27708
| | - Justin J Fu
- Department of Biomedical Engineering Duke University Durham, NC 27708
| | - Jianyong Huang
- Department of Biomedical Engineering Duke University Durham, NC 27708
| | - Fan Yuan
- Department of Biomedical Engineering Duke University Durham, NC 27708
| | - George A Truskey
- Department of Biomedical Engineering Duke University Durham, NC 27708
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43
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Linask KK, Han M, Bravo-Valenzuela NJM. Changes in vitelline and utero-placental hemodynamics: implications for cardiovascular development. Front Physiol 2014; 5:390. [PMID: 25426076 PMCID: PMC4227466 DOI: 10.3389/fphys.2014.00390] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Accepted: 09/21/2014] [Indexed: 12/31/2022] Open
Abstract
Analyses of cardiovascular development have shown an important interplay between heart function, blood flow, and morphogenesis of heart structure during the formation of a four-chambered heart. It is known that changes in vitelline and placental blood flow seemingly contribute substantially to early cardiac hemodynamics. This suggests that in order to understand mammalian cardiac structure-hemodynamic functional relationships, blood flow from the extra-embryonic circulation needs to be taken into account and its possible impact on cardiogenesis defined. Previously published Doppler ultrasound analyses and data of utero-placental blood flow from human studies and those using the mouse model are compared to changes observed with environmental exposures that lead to cardiovascular anomalies. Use of current concepts and models related to mechanotransduction of blood flow and fluid forces may help in the future to better define the characteristics of normal and abnormal utero-placental blood flow and the changes in the biophysical parameters that may contribute to congenital heart defects. Evidence from multiple studies is discussed to provide a framework for future modeling of the impact of experimental changes in blood flow on the mouse heart during normal and abnormal cardiogenesis.
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Affiliation(s)
- Kersti K Linask
- Department of Pediatrics, Morsani College of Medicine, Children's Research Institute, University of South Florida Health St. Petersburg, FL, USA
| | - Mingda Han
- Department of Pediatrics, Morsani College of Medicine, Children's Research Institute, University of South Florida Health St. Petersburg, FL, USA
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44
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Wong HS, Jaumouillé V, Heit B, Doodnauth SA, Patel S, Huang YW, Grinstein S, Robinson LA. Cytoskeletal confinement of CX3CL1 limits its susceptibility to proteolytic cleavage by ADAM10. Mol Biol Cell 2014; 25:3884-99. [PMID: 25253723 PMCID: PMC4244198 DOI: 10.1091/mbc.e13-11-0633] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
CX3CL1 diffuses within confined regions of the plasma membrane. CX3CL1 is confined by the cortical actin cytoskeleton, not lipid rafts. Actin confinement regions protect CX3CL1 from proteolysis by limiting its interactions with ADAM10. CX3CL1 is a unique chemokine that acts both as a transmembrane endothelial adhesion molecule and, upon proteolytic cleavage, a soluble chemoattractant for circulating leukocytes. The constitutive release of soluble CX3CL1 requires the interaction of its transmembrane species with the integral membrane metalloprotease ADAM10, yet the mechanisms governing this process remain elusive. Using single-particle tracking and subdiffraction imaging, we studied how ADAM10 interacts with CX3CL1. We observed that the majority of cell surface CX3CL1 diffused within restricted confinement regions structured by the cortical actin cytoskeleton. These confinement regions sequestered CX3CL1 from ADAM10, precluding their association. Disruption of the actin cytoskeleton reduced CX3CL1 confinement and increased CX3CL1–ADAM10 interactions, promoting the release of soluble chemokine. Our results demonstrate a novel role for the cytoskeleton in limiting membrane protein proteolysis, thereby regulating both cell surface levels and the release of soluble ligand.
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Affiliation(s)
- Harikesh S Wong
- Program in Cell Biology, Hospital for Sick Children, Toronto, ON M5G 1X8, Canada Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Valentin Jaumouillé
- Program in Cell Biology, Hospital for Sick Children, Toronto, ON M5G 1X8, Canada
| | - Bryan Heit
- Department of Microbiology and Immunology, University of Western Ontario, London, ON N6A 5C1, Canada
| | - Sasha A Doodnauth
- Program in Cell Biology, Hospital for Sick Children, Toronto, ON M5G 1X8, Canada
| | - Sajedabanu Patel
- Program in Cell Biology, Hospital for Sick Children, Toronto, ON M5G 1X8, Canada
| | - Yi-Wei Huang
- Program in Cell Biology, Hospital for Sick Children, Toronto, ON M5G 1X8, Canada
| | - Sergio Grinstein
- Program in Cell Biology, Hospital for Sick Children, Toronto, ON M5G 1X8, Canada Keenan Research Centre of the Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, ON M5B 1W8, Canada
| | - Lisa A Robinson
- Program in Cell Biology, Hospital for Sick Children, Toronto, ON M5G 1X8, Canada Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada Department of Paediatrics, University of Toronto, Toronto, ON M5S 2J7, Canada
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45
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Ostrowski MA, Huang NF, Walker TW, Verwijlen T, Poplawski C, Khoo AS, Cooke JP, Fuller GG, Dunn AR. Microvascular endothelial cells migrate upstream and align against the shear stress field created by impinging flow. Biophys J 2014; 106:366-74. [PMID: 24461011 DOI: 10.1016/j.bpj.2013.11.4502] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Revised: 08/27/2013] [Accepted: 11/26/2013] [Indexed: 11/30/2022] Open
Abstract
At present, little is known about how endothelial cells respond to spatial variations in fluid shear stress such as those that occur locally during embryonic development, at heart valve leaflets, and at sites of aneurysm formation. We built an impinging flow device that exposes endothelial cells to gradients of shear stress. Using this device, we investigated the response of microvascular endothelial cells to shear-stress gradients that ranged from 0 to a peak shear stress of 9-210 dyn/cm(2). We observe that at high confluency, these cells migrate against the direction of fluid flow and concentrate in the region of maximum wall shear stress, whereas low-density microvascular endothelial cells that lack cell-cell contacts migrate in the flow direction. In addition, the cells align parallel to the flow at low wall shear stresses but orient perpendicularly to the flow direction above a critical threshold in local wall shear stress. Our observations suggest that endothelial cells are exquisitely sensitive to both magnitude and spatial gradients in wall shear stress. The impinging flow device provides a, to our knowledge, novel means to study endothelial cell migration and polarization in response to gradients in physical forces such as wall shear stress.
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Affiliation(s)
| | - Ngan F Huang
- Center for Tissue Regeneration, Repair and Restoration, Veterans Affairs Palo Alto Health Care System, Palo Alto, California; Stanford Cardiovascular Institute, Stanford University, Stanford, Califiornia; Division of Cardiovascular Medicine, Stanford University, Stanford, California
| | - Travis W Walker
- Chemical Engineering, Stanford University, Stanford, California
| | - Tom Verwijlen
- Department of Chemical Engineering, KU Leuven, Belgium
| | | | - Amanda S Khoo
- Division of Cardiovascular Medicine, Stanford University, Stanford, California
| | - John P Cooke
- Stanford Cardiovascular Institute, Stanford University, Stanford, Califiornia; Division of Cardiovascular Medicine, Stanford University, Stanford, California
| | - Gerald G Fuller
- Chemical Engineering, Stanford University, Stanford, California.
| | - Alexander R Dunn
- Chemical Engineering, Stanford University, Stanford, California; Stanford Cardiovascular Institute, Stanford University, Stanford, Califiornia.
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Gulino-Debrac D. Mechanotransduction at the basis of endothelial barrier function. Tissue Barriers 2014; 1:e24180. [PMID: 24665386 PMCID: PMC3879236 DOI: 10.4161/tisb.24180] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 03/01/2013] [Accepted: 03/02/2013] [Indexed: 01/03/2023] Open
Abstract
Destabilization of cell-cell contacts involved in the maintenance of endothelial barrier function can lead to increased endothelial permeability. This increase in endothelial permeability results in an anarchical movement of fluid, solutes and cells outside the vasculature and into the surrounding tissues, thereby contributing to various diseases such as stroke or pulmonary edema. Thus, a better understanding of the molecular mechanisms regulating endothelial cell junction integrity is required for developing new therapies for these diseases. In this review, we describe the mechanotransduction mechanism at the basis of adherens junction strengthening at endothelial cell-cell contacts. More particularly, we report on the emerging role of α-catenin and EPLIN that act as a mechanotransmitter of myosin-IIgenerated traction forces. The interplay between α-catenin, EPLIN and the myosin-II machinery initiates the junctional recruitment of vinculin and α-actinin leading to a drastic remodeling of the actin cytoskeleton and to cortical actin ring reshaping. The pathways initiated by tyrosine phosphorylation of VE-cadherin at the basis of endothelial cell-cell junction remodeling is also reported, as it may be interrelated to α-catenin/ EPLIN-mediated mechanotransduction mechanisms. We also describe the junctional mechanosensory complex composed of PECAM-1, VE-cadherin and VEGFR2 that is able to transmit signaling pathway under the onset of shear stress. This mechanosensing mechanism, involved in the earliest events promoting atherogenesis, is required for endothelial cell alignment along flow direction.
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Affiliation(s)
- Danielle Gulino-Debrac
- Biology of Cancer and Infection Laboratory; U INSERM 1036, iRTSV; Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA); Université Joseph Fourier; Grenoble, France
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Jerrell RJ, Parekh A. Cellular traction stresses mediate extracellular matrix degradation by invadopodia. Acta Biomater 2014; 10:1886-96. [PMID: 24412623 DOI: 10.1016/j.actbio.2013.12.058] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Revised: 11/26/2013] [Accepted: 12/30/2013] [Indexed: 12/20/2022]
Abstract
During tumorigenesis, matrix rigidity can drive oncogenic transformation via altered cellular proliferation and migration. Cells sense extracellular matrix (ECM) mechanical properties with intracellular tensile forces generated by actomyosin contractility. These contractile forces are transmitted to the matrix surface as traction stresses, which mediate mechanical interactions with the ECM. Matrix rigidity has been shown to increase proteolytic ECM degradation by cytoskeletal structures known as invadopodia that are critical for cancer progression, suggesting that cellular contractility promotes invasive behavior. However, both increases and decreases in traction stresses have been associated with metastatic behavior. Therefore, the role of cellular contractility in invasive migration leading to metastasis is unclear. To determine the relationship between cellular traction stresses and invadopodia activity, we characterized the invasive and contractile properties of an aggressive carcinoma cell line utilizing polyacrylamide gels of different rigidities. We found that ECM degradation and traction stresses were linear functions of matrix rigidity. Using calyculin A to augment myosin contractility, we also found that traction stresses were strongly predictive of ECM degradation. Overall, our data suggest that cellular force generation may play an important part in invasion and metastasis by mediating invadopodia activity in response to the mechanical properties of the tumor microenvironment.
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48
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Experimental tools to monitor the dynamics of endothelial barrier function: a survey of in vitro approaches. Cell Tissue Res 2014; 355:485-514. [DOI: 10.1007/s00441-014-1810-3] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Accepted: 01/13/2014] [Indexed: 02/05/2023]
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49
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Unal M, Alapan Y, Jia H, Varga AG, Angelino K, Aslan M, Sayin I, Han C, Jiang Y, Zhang Z, Gurkan UA. Micro and Nano-Scale Technologies for Cell Mechanics. Nanobiomedicine (Rij) 2014; 1:5. [PMID: 30023016 PMCID: PMC6029242 DOI: 10.5772/59379] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Accepted: 09/18/2014] [Indexed: 01/09/2023] Open
Abstract
Cell mechanics is a multidisciplinary field that bridges cell biology, fundamental mechanics, and micro and nanotechnology, which synergize to help us better understand the intricacies and the complex nature of cells in their native environment. With recent advances in nanotechnology, microfabrication methods and micro-electro-mechanical-systems (MEMS), we are now well situated to tap into the complex micro world of cells. The field that brings biology and MEMS together is known as Biological MEMS (BioMEMS). BioMEMS take advantage of systematic design and fabrication methods to create platforms that allow us to study cells like never before. These new technologies have been rapidly advancing the study of cell mechanics. This review article provides a succinct overview of cell mechanics and comprehensively surveys micro and nano-scale technologies that have been specifically developed for and are relevant to the mechanics of cells. Here we focus on micro and nano-scale technologies, and their applications in biology and medicine, including imaging, single cell analysis, cancer cell mechanics, organ-on-a-chip systems, pathogen detection, implantable devices, neuroscience and neurophysiology. We also provide a perspective on the future directions and challenges of technologies that relate to the mechanics of cells.
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Affiliation(s)
- Mustafa Unal
- Department of Electrical Engineering and Computer Science, Case Western Reserve University, Cleveland, USA
| | - Yunus Alapan
- Department of Electrical Engineering and Computer Science, Case Western Reserve University, Cleveland, USA
- Case Biomanufacturing and Microfabrication Laboratory, Case Western Reserve University, Cleveland, USA
| | - Hao Jia
- Department of Biology, Case Western Reserve University, Cleveland, USA
| | - Adrienn G. Varga
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, USA
| | - Keith Angelino
- Department of Civil Engineering, Case Western Reserve University, Cleveland, USA
| | - Mahmut Aslan
- Department of Electrical Engineering and Computer Science, Case Western Reserve University, Cleveland, USA
- Case Biomanufacturing and Microfabrication Laboratory, Case Western Reserve University, Cleveland, USA
| | - Ismail Sayin
- Case Biomanufacturing and Microfabrication Laboratory, Case Western Reserve University, Cleveland, USA
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, USA
| | - Chanjuan Han
- Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, USA
| | - Yanxia Jiang
- Department of Electrical Engineering and Computer Science, Case Western Reserve University, Cleveland, USA
| | - Zhehao Zhang
- Department of Civil Engineering, Case Western Reserve University, Cleveland, USA
| | - Umut A. Gurkan
- Department of Electrical Engineering and Computer Science, Case Western Reserve University, Cleveland, USA
- Case Biomanufacturing and Microfabrication Laboratory, Case Western Reserve University, Cleveland, USA
- Department of Orthopaedics, Case Western Reserve University, Cleveland, USA
- Advanced Platform Technology Center, Louis Stokes Cleveland Veterans Affairs Medical Center, Cleveland, USA
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50
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Abstract
Micropatterning of cells can be used in combination with microposts to control cell shape or cell-to-cell interaction while measuring cellular forces. The protocols in this chapter describe how to make SU8 masters for stamps and microposts, how to use soft lithography to replicate these structures in polydimethylsiloxane, and how to functionalize the surface of the microposts for cell attachment.
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Affiliation(s)
- Nathan J Sniadecki
- Department of Mechanical Engineering, University of Washington, Seattle, Washington, USA; Department of Bioengineering, University of Washington, Seattle, Washington, USA
| | - Sangyoon J Han
- Department of Mechanical Engineering, University of Washington, Seattle, Washington, USA
| | - Lucas H Ting
- Department of Mechanical Engineering, University of Washington, Seattle, Washington, USA
| | - Shirin Feghhi
- Department of Mechanical Engineering, University of Washington, Seattle, Washington, USA
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