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Wolf M, Darwish O, Neji R, Eder M, Sunder-Plassmann G, Heinz G, Robinson SD, Schmid AI, Moser EV, Sinkus R, Meyerspeer M. Magnetic resonance elastography resolving all gross anatomical segments of the kidney during controlled hydration. Front Physiol 2024; 15:1327407. [PMID: 38384795 PMCID: PMC10880033 DOI: 10.3389/fphys.2024.1327407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 01/24/2024] [Indexed: 02/23/2024] Open
Abstract
Introduction: Magnetic resonance elastography (MRE) is a non-invasive method to quantify biomechanical properties of human tissues. It has potential in diagnosis and monitoring of kidney disease, if established in clinical practice. The interplay of flow and volume changes in renal vessels, tubule, urinary collection system and interstitium is complex, but physiological ranges of in vivo viscoelastic properties during fasting and hydration have never been investigated in all gross anatomical segments simultaneously. Method: Ten healthy volunteers underwent two imaging sessions, one following a 12-hour fasting period and the second after a drinking challenge of >10 mL per kg body weight (60-75 min before the second examination). High-resolution renal MRE was performed using a novel driver with rotating eccentric mass placed at the posterior-lateral wall to couple waves (50 Hz) to the kidney. The biomechanical parameters, shear wave speed (cs in m/s), storage modulus (Gd in kPa), loss modulus (Gl in kPa), phase angle ( Υ = 2 π atan G l G d ) and attenuation (α in 1/mm) were derived. Accurate separation of gross anatomical segments was applied in post-processing (whole kidney, cortex, medulla, sinus, vessel). Results: High-quality shear waves coupled into all gross anatomical segments of the kidney (mean shear wave displacement: 163 ± 47 μm, mean contamination of second upper harmonics <23%, curl/divergence: 4.3 ± 0.8). Regardless of the hydration state, median Gd of the cortex and medulla (0.68 ± 0.11 kPa) was significantly higher than that of the sinus and vessels (0.48 ± 0.06 kPa), and consistently, significant differences were found in cs, Υ , and Gl (all p < 0.001). The viscoelastic parameters of cortex and medulla were not significantly different. After hydration sinus exhibited a small but significant reduction in median Gd by -0.02 ± 0.04 kPa (p = 0.01), and, consequently, the cortico-sinusoidal-difference in Gd increased by 0.04 ± 0.07 kPa (p = 0.05). Only upon hydration, the attenuation in vessels became lower (0.084 ± 0.013 1/mm) and differed significantly from the whole kidney (0.095 ± 0.007 1/mm, p = 0.01). Conclusion: High-resolution renal MRE with an innovative driver and well-defined 3D segmentation can resolve all renal segments, especially when including the sinus in the analysis. Even after a prolonged hydration period the approach is sensitive to small hydration-related changes in the sinus and in the cortico-sinusoidal-difference.
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Affiliation(s)
- Marcos Wolf
- High Field MR Center, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria
| | - Omar Darwish
- School of Biomedical Engineering and Imaging Sciences, King’s College London, London, United Kingdom
- MR Research Collaborations, Siemens Healthcare Limited, Frimley, United Kingdom
| | - Radhouene Neji
- School of Biomedical Engineering and Imaging Sciences, King’s College London, London, United Kingdom
| | - Michael Eder
- Department of Medicine III, Division of Nephrology and Dialysis, General Hospital and Medical University of Vienna, Vienna, Austria
| | - Gere Sunder-Plassmann
- Department of Medicine III, Division of Nephrology and Dialysis, General Hospital and Medical University of Vienna, Vienna, Austria
| | - Gertraud Heinz
- Institut für Diagnostische und Interventionelle Radiologie, Universitätsklinikum St. Pölten, Sankt Pölten, Austria
| | - Simon Daniel Robinson
- High Field MR Centre, Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria
- Centre of Advanced Imaging, University of Queensland, Brisbane, QLD, Australia
| | - Albrecht Ingo Schmid
- High Field MR Center, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria
| | - Ewald V. Moser
- High Field MR Center, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria
| | - Ralph Sinkus
- Institut National de La Santé et de La Recherche Médicale, U1148, Laboratory for Vascular Translational Science, Paris, France
| | - Martin Meyerspeer
- High Field MR Center, Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria
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2
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Chen J, Chen J, Heilman JA, Glaser KJ, Grimm RC, Owusu N, Qiu C, Ehman RL, Yin M. Abdominal MR elastography with multiple driver arrays: performance and repeatability. Abdom Radiol (NY) 2023; 48:1945-1954. [PMID: 36928333 PMCID: PMC10201649 DOI: 10.1007/s00261-023-03866-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 02/20/2023] [Accepted: 02/21/2023] [Indexed: 03/18/2023]
Abstract
PURPOSE To evaluate the performance and repeatability assessing liver, spleen, and kidney stiffness with magnetic resonance elastography (MRE), using arrays of pneumatic passive drivers. METHODS An array of four flexible, pneumatically activated passive drivers for abdominal MRE were developed and tested in this study. Multiple MRE acquisitions were performed prospectively in a series of eleven volunteers, with activation of all combinations of the four drivers, individually and simultaneously. MRE exams were repeated three times to study within-day and between-day test-retest repeatability. Semi-quantitative evaluation of wave propagation and penetration, and quantitative assessment of tissue stiffness was conducted for liver, spleen, and kidneys. RESULTS When driver location and amplitude were sufficient to achieve necessary shear wave illumination in any given region of interest, the results showed excellent test-retest repeatability in abdominal organ stiffness with both single and multiple driver configurations. The results confirmed that multiple driver arrays provided suitable shear wave illumination over a larger region of the abdomen, allowing more reliable stiffness measurements in multiple organs. MRE assessment of the spleen was found to be prone to effects of excessive shear wave amplitude, however. CONCLUSION A multiple driver array provides shear wave illumination over a larger region of the abdomen than obtained with a single driver, for MRE assessment of multiple abdominal organs, providing excellent test-retest repeatability in stiffness measurements. However, careful tuning of the location and amplitude of each driver is essential to achieve consistent results.
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Affiliation(s)
- Jie Chen
- Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA
| | - Jun Chen
- Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA
| | - Jeremiah A Heilman
- Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA
| | - Kevin J Glaser
- Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA
| | - Roger C Grimm
- Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA
| | - Nana Owusu
- Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA
| | - Caixin Qiu
- Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA
| | - Richard L Ehman
- Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA
| | - Meng Yin
- Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA.
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3
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Nyga A, Stamati K, Redondo PA, Azimi T, Feber A, Neves JB, Hamoudi R, Presneau N, El Sheikh S, Tran MGB, Emberton M, Loizidou M, Cheema U. Renal tumouroids: challenges of manufacturing 3D cultures from patient derived primary cells. J Cell Commun Signal 2022; 16:637-648. [PMID: 35102500 PMCID: PMC9733748 DOI: 10.1007/s12079-022-00666-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Accepted: 01/04/2022] [Indexed: 12/14/2022] Open
Abstract
Recent advancements in 3D in vitro culture have allowed for the development of cancer tissue models which accurately recapitulate the tumour microenvironment. Consequently, there has been increased innovation in therapeutic drug screening. While organoid cultures show great potential, they are limited by the time scale of their growth in vitro and the dependence upon commercial matrices, such as Matrigel, which do not allow for manipulations of their composition or mechanical properties. Here, we show a straightforward approach for the isolation and culture of primary human renal carcinoma cells and matched non-affected kidney. This approach does not require any specific selection for cancer cells, and allows for their direct culture in amenable 3D collagen-based matrices, with the preservation of cancer cells as confirmed by NGS sequencing. This method allows for culture of patient-derived cancer cells in 3D microenvironment, which can be used for downstream experimentation such as investigation of cell-matrix interaction or drug screening.
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Affiliation(s)
- Agata Nyga
- Research Department of Surgical Biotechnology, Division of Surgery & Interventional Science, University College London, London, UK ,Cell Biology Division, MRC Laboratory for Molecular Biology, Cambridge Biomedical Campus, Francis Crick Avenue, Cambridge, CB2 0QH UK
| | - Katerina Stamati
- Research Department of Surgical Biotechnology, Division of Surgery & Interventional Science, University College London, London, UK
| | - Patricia A. Redondo
- Research Department of Surgical Biotechnology, Division of Surgery & Interventional Science, University College London, London, UK
| | - Tayebeh Azimi
- Research Department of Surgical Biotechnology, Division of Surgery & Interventional Science, University College London, London, UK
| | - Andrew Feber
- Research Department of Surgical Biotechnology, Division of Surgery & Interventional Science, University College London, London, UK ,Centre for Molecular Pathology, Royal Marsden NHS Trust, London, UK
| | - Joana B. Neves
- Research Department of Surgical Biotechnology, Division of Surgery & Interventional Science, University College London, London, UK ,Specialist Centre for Kidney Cancer, Royal Free London NHS Foundation Trust, London, UK
| | - Rifat Hamoudi
- Research Department of Surgical Biotechnology, Division of Surgery & Interventional Science, University College London, London, UK ,Sharjah Institute for Medical Research, College of Medicine, University of Sharjah, Sharjah, United Arab Emirates
| | - Nadège Presneau
- School of Life Sciences, University of Westminster, London, UK
| | - Soha El Sheikh
- Cellular Pathology Department, Royal Free London Foundation Trust, London, UK
| | - Maxine G. B. Tran
- Research Department of Surgical Biotechnology, Division of Surgery & Interventional Science, University College London, London, UK ,Specialist Centre for Kidney Cancer, Royal Free London NHS Foundation Trust, London, UK
| | - Mark Emberton
- Centre for 3D Models of Health and Disease, Research Department of Targeted Intervention, Division of Surgery & Interventional Science, University College London, Charles Bell House,43-45 Foley Street, London, W1W 7TS UK ,Department of Urology, University College London Hospitals NHS Foundation Trust, London, UK
| | - Marilena Loizidou
- Research Department of Surgical Biotechnology, Division of Surgery & Interventional Science, University College London, London, UK
| | - Umber Cheema
- Centre for 3D Models of Health and Disease, Research Department of Targeted Intervention, Division of Surgery & Interventional Science, University College London, Charles Bell House,43-45 Foley Street, London, W1W 7TS UK
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Pichler R, Rizzo L, Tröndle K, Bühler M, Brucker H, Müller AL, Grand K, Farè S, Viau A, Kaminski MM, Kuehn EW, Koch F, Zimmermann S, Koltay P, Lienkamp SS. Tuning the 3D microenvironment of reprogrammed tubule cells enhances biomimetic modeling of polycystic kidney disease. Biomaterials 2022; 291:121910. [DOI: 10.1016/j.biomaterials.2022.121910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 11/04/2022] [Accepted: 11/06/2022] [Indexed: 11/09/2022]
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5
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Petracchini S, Hamaoui D, Doye A, Asnacios A, Fage F, Vitiello E, Balland M, Janel S, Lafont F, Gupta M, Ladoux B, Gilleron J, Maia TM, Impens F, Gagnoux-Palacios L, Daugaard M, Sorensen PH, Lemichez E, Mettouchi A. Optineurin links Hace1-dependent Rac ubiquitylation to integrin-mediated mechanotransduction to control bacterial invasion and cell division. Nat Commun 2022; 13:6059. [PMID: 36229487 PMCID: PMC9561704 DOI: 10.1038/s41467-022-33803-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 09/30/2022] [Indexed: 12/24/2022] Open
Abstract
Extracellular matrix (ECM) elasticity is perceived by cells via focal adhesion structures, which transduce mechanical cues into chemical signalling to conform cell behavior. Although the contribution of ECM compliance to the control of cell migration or division is extensively studied, little is reported regarding infectious processes. We study this phenomenon with the extraintestinal Escherichia coli pathogen UTI89. We show that UTI89 takes advantage, via its CNF1 toxin, of integrin mechanoactivation to trigger its invasion into cells. We identify the HACE1 E3 ligase-interacting protein Optineurin (OPTN) as a protein regulated by ECM stiffness. Functional analysis establishes a role of OPTN in bacterial invasion and integrin mechanical coupling and for stimulation of HACE1 E3 ligase activity towards the Rac1 GTPase. Consistent with a role of OPTN in cell mechanics, OPTN knockdown cells display defective integrin-mediated traction force buildup, associated with limited cellular invasion by UTI89. Nevertheless, OPTN knockdown cells display strong mechanochemical adhesion signalling, enhanced Rac1 activation and increased cyclin D1 translation, together with enhanced cell proliferation independent of ECM stiffness. Together, our data ascribe a new function to OPTN in mechanobiology.
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Affiliation(s)
- Serena Petracchini
- grid.508487.60000 0004 7885 7602Institut Pasteur, Université Paris Cité, CNRS UMR6047, INSERM U1306, Unité des Toxines Bactériennes, F-75015 Paris, France
| | - Daniel Hamaoui
- grid.462370.40000 0004 0620 5402Université Côte d’Azur, INSERM, C3M, Team Microbial Toxins in Host-Pathogen Interactions, Nice, France ,Equipe Labellisée Ligue Contre le Cancer, Nice, France
| | - Anne Doye
- grid.462370.40000 0004 0620 5402Université Côte d’Azur, INSERM, C3M, Team Microbial Toxins in Host-Pathogen Interactions, Nice, France ,Equipe Labellisée Ligue Contre le Cancer, Nice, France
| | - Atef Asnacios
- grid.463714.3Université Paris Cité, CNRS, Laboratoire Matière et Systèmes Complexes, UMR7057, F-75013 Paris, France
| | - Florian Fage
- grid.463714.3Université Paris Cité, CNRS, Laboratoire Matière et Systèmes Complexes, UMR7057, F-75013 Paris, France
| | - Elisa Vitiello
- grid.462689.70000 0000 9272 9931Université Grenoble Alpes, CNRS, LiPhy, F-38000 Grenoble, France
| | - Martial Balland
- grid.462689.70000 0000 9272 9931Université Grenoble Alpes, CNRS, LiPhy, F-38000 Grenoble, France
| | - Sebastien Janel
- grid.410463.40000 0004 0471 8845Université de Lille, CNRS, INSERM, CHU Lille, Institut Pasteur de Lille, U1019-UMR9017, CIIL—Center for Infection and Immunity of Lille, F-59000 Lille, France
| | - Frank Lafont
- grid.410463.40000 0004 0471 8845Université de Lille, CNRS, INSERM, CHU Lille, Institut Pasteur de Lille, U1019-UMR9017, CIIL—Center for Infection and Immunity of Lille, F-59000 Lille, France
| | - Mukund Gupta
- grid.461913.80000 0001 0676 2143Université Paris Cité, CNRS, Institut Jacques Monod, F-75013 Paris, France
| | - Benoit Ladoux
- grid.461913.80000 0001 0676 2143Université Paris Cité, CNRS, Institut Jacques Monod, F-75013 Paris, France
| | - Jerôme Gilleron
- grid.462370.40000 0004 0620 5402Université Côte d’Azur, INSERM, C3M, Team Cellular and Molecular Pathophysiology of Obesity and Diabetes, Nice, France
| | - Teresa M. Maia
- grid.511525.7VIB-UGent Center for Medical Biotechnology, VIB, Ghent, Belgium ,grid.5342.00000 0001 2069 7798Department of Biomolecular Medicine, Ghent University, Ghent, Belgium ,grid.11486.3a0000000104788040VIB Proteomics Core, VIB, Ghent, Belgium
| | - Francis Impens
- grid.511525.7VIB-UGent Center for Medical Biotechnology, VIB, Ghent, Belgium ,grid.5342.00000 0001 2069 7798Department of Biomolecular Medicine, Ghent University, Ghent, Belgium ,grid.11486.3a0000000104788040VIB Proteomics Core, VIB, Ghent, Belgium
| | - Laurent Gagnoux-Palacios
- grid.461605.0Université Côte d’Azur, CNRS, INSERM, Institut de Biologie Valrose (iBV), 06108 Nice, France
| | - Mads Daugaard
- grid.412541.70000 0001 0684 7796Vancouver Prostate Centre, Vancouver, BC V6H 3Z6 Canada ,grid.17091.3e0000 0001 2288 9830Department of Urologic Sciences, University of British Columbia, Vancouver, BC Canada
| | - Poul H. Sorensen
- grid.17091.3e0000 0001 2288 9830Department of Molecular Oncology, BC Cancer Research Center, University of British Columbia, Vancouver, BC V5Z1L3 Canada
| | - Emmanuel Lemichez
- grid.508487.60000 0004 7885 7602Institut Pasteur, Université Paris Cité, CNRS UMR6047, INSERM U1306, Unité des Toxines Bactériennes, F-75015 Paris, France ,grid.462370.40000 0004 0620 5402Université Côte d’Azur, INSERM, C3M, Team Microbial Toxins in Host-Pathogen Interactions, Nice, France ,Equipe Labellisée Ligue Contre le Cancer, Nice, France
| | - Amel Mettouchi
- grid.508487.60000 0004 7885 7602Institut Pasteur, Université Paris Cité, CNRS UMR6047, INSERM U1306, Unité des Toxines Bactériennes, F-75015 Paris, France ,grid.462370.40000 0004 0620 5402Université Côte d’Azur, INSERM, C3M, Team Microbial Toxins in Host-Pathogen Interactions, Nice, France ,Equipe Labellisée Ligue Contre le Cancer, Nice, France
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Song E, Huang Y, Huang N, Mei Y, Yu X, Rogers JA. Recent advances in microsystem approaches for mechanical characterization of soft biological tissues. MICROSYSTEMS & NANOENGINEERING 2022; 8:77. [PMID: 35812806 PMCID: PMC9262960 DOI: 10.1038/s41378-022-00412-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 05/20/2022] [Accepted: 06/08/2022] [Indexed: 06/09/2023]
Abstract
Microsystem technologies for evaluating the mechanical properties of soft biological tissues offer various capabilities relevant to medical research and clinical diagnosis of pathophysiologic conditions. Recent progress includes (1) the development of tissue-compliant designs that provide minimally invasive interfaces to soft, dynamic biological surfaces and (2) improvements in options for assessments of elastic moduli at spatial scales from cellular resolution to macroscopic areas and across depths from superficial levels to deep geometries. This review summarizes a collection of these technologies, with an emphasis on operational principles, fabrication methods, device designs, integration schemes, and measurement features. The core content begins with a discussion of platforms ranging from penetrating filamentary probes and shape-conformal sheets to stretchable arrays of ultrasonic transducers. Subsequent sections examine different techniques based on planar microelectromechanical system (MEMS) approaches for biocompatible interfaces to targets that span scales from individual cells to organs. One highlighted example includes miniature electromechanical devices that allow depth profiling of soft tissue biomechanics across a wide range of thicknesses. The clinical utility of these technologies is in monitoring changes in tissue properties and in targeting/identifying diseased tissues with distinct variations in modulus. The results suggest future opportunities in engineered systems for biomechanical sensing, spanning a broad scope of applications with relevance to many aspects of health care and biology research.
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Affiliation(s)
- Enming Song
- Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception, Institute of Optoelectronics, Fudan University, Shanghai, 200433 China
- International Institute of Intelligent Nanorobots and Nanosystems, Fudan University, Shanghai, 200433 China
| | - Ya Huang
- Department of Biomedical Engineering, City University of Hong Kong, Hong Kong, 999077 China
| | - Ningge Huang
- Department of Materials Science, Fudan University, Shanghai, 200433 China
| | - Yongfeng Mei
- International Institute of Intelligent Nanorobots and Nanosystems, Fudan University, Shanghai, 200433 China
- Department of Materials Science, Fudan University, Shanghai, 200433 China
| | - Xinge Yu
- Department of Biomedical Engineering, City University of Hong Kong, Hong Kong, 999077 China
| | - John A. Rogers
- Querrey Simpson Institute for Bioelectronics, Department of Materials Science and Engineering, Departments of Biomedical Engineering, Neurological Surgery, Chemistry, Mechanical Engineering, Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208 USA
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7
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Chen Y, Ding JL, Babaiasl M, Yang F, Swensen JP. Characterization and modeling of a thermoplastic elastomer tissue simulant under uniaxial compression loading for a wide range of strain rates. J Mech Behav Biomed Mater 2022; 131:105218. [DOI: 10.1016/j.jmbbm.2022.105218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 03/04/2022] [Accepted: 04/02/2022] [Indexed: 11/16/2022]
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8
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Bhusal A, Dogan E, Nguyen HA, Labutina O, Nieto D, Khademhosseini A, Miri AK. Multi-material digital light processing bioprinting of hydrogel-based microfluidic chips. Biofabrication 2021; 14:10.1088/1758-5090/ac2d78. [PMID: 34614486 PMCID: PMC10700126 DOI: 10.1088/1758-5090/ac2d78] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 10/06/2021] [Indexed: 11/12/2022]
Abstract
Recent advancements in digital-light-processing (DLP)-based bioprinting and hydrogel engineering have enabled novel developments in organs-on-chips. In this work, we designed and developed a multi-material, DLP-based bioprinter for rapid, one-step prototyping of hydrogel-based microfluidic chips. A composite hydrogel bioink based on poly-ethylene-glycol-diacrylate (PEGDA) and gelatin methacryloyl (GelMA) was optimized through varying the bioprinting parameters such as light exposure time, bioink composition, and layer thickness. We showed a wide range of mechanical properties of the microfluidic chips for various ratios of PEGDA:GelMA. Microfluidic features of hydrogel-based chips were then tested using dynamic flow experiments. Human-derived tumor cells were encapsulated in 3D bioprinted structures to demonstrate their bioactivity and cell-friendly environment. Cell seeding experiments then validated the efficacy of the selected bioinks for vascularized micro-tissues. Our biofabrication approach offers a useful tool for the rapid integration of micro-tissue models into organs-on-chips and high-throughput drug screening platforms.
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Affiliation(s)
- Anant Bhusal
- Biofabrication Lab, Department of Mechanical Engineering, Rowan University, Glassboro, NJ 08028
| | - Elvan Dogan
- Biofabrication Lab, Department of Mechanical Engineering, Rowan University, Glassboro, NJ 08028
| | - Hai-Anh Nguyen
- Biofabrication Lab, Department of Mechanical Engineering, Rowan University, Glassboro, NJ 08028
| | - Olga Labutina
- Biofabrication Lab, Department of Mechanical Engineering, Rowan University, Glassboro, NJ 08028
| | - Daniel Nieto
- Photonics4life Research Group, Department of Physics, University of Santiago de Compostela, A Coruña, Spain
| | - Ali Khademhosseini
- Terasaki Institute for Biomedical Innovation (TIBI), Los Angeles, CA 90024, USA
- Department of Radiology and Department of Chemical and Biomolecular Engineering, University of California-Los Angeles, Los Angeles, CA 90095 USA
- Department of Chemical and Biomolecular Engineering, Henry Samueli School of Engineering and Applied Sciences, University of California – Los Angeles, Los Angeles, CA 90095, USA
| | - Amir K. Miri
- Biofabrication Lab, Department of Mechanical Engineering, Rowan University, Glassboro, NJ 08028
- Department of Biomedical Engineering, Rowan University, Glassboro, NJ 08028, USA
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9
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Fiorito M, Fovargue D, Capilnasiu A, Hadjicharalambous M, Nordsletten D, Sinkus R, Lee J. Impact of axisymmetric deformation on MR elastography of a nonlinear tissue-mimicking material and implications in peri-tumour stiffness quantification. PLoS One 2021; 16:e0253804. [PMID: 34242296 PMCID: PMC8270167 DOI: 10.1371/journal.pone.0253804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 06/12/2021] [Indexed: 11/19/2022] Open
Abstract
Solid tumour growth is often associated with the accumulation of mechanical stresses acting on the surrounding host tissue. Due to tissue nonlinearity, the shear modulus of the peri-tumoural region inherits a signature from the tumour expansion which depends on multiple factors, including the soft tissue constitutive behaviour and its stress/strain state. Shear waves used in MR-elastography (MRE) sense the apparent change in shear modulus along their propagation direction, thereby probing the anisotropic stiffness field around the tumour. We developed an analytical framework for a heterogeneous shear modulus distribution using a thick-shelled sphere approximation of the tumour and soft tissue ensemble. A hyperelastic material (plastisol) was identified to validate the proposed theory in a phantom setting. A balloon-catheter connected to a pressure sensor was used to replicate the stress generated from tumour pressure and growth while MRE data were acquired. The shear modulus anisotropy retrieved from the reconstructed elastography data confirmed the analytically predicted patterns at various levels of inflation. An alternative measure, combining the generated deformation and the local wave direction and independent of the reconstruction strategy, was also proposed to correlate the analytical findings with the stretch probed by the waves. Overall, this work demonstrates that MRE in combination with non-linear mechanics, is able to identify the apparent shear modulus variation arising from the strain generated by a growth within tissue, such as an idealised model of tumour. Investigation in real tissue represents the next step to further investigate the implications of endogenous forces in tissue characterisation through MRE.
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Affiliation(s)
- Marco Fiorito
- School of Biomedical Engineering and Imaging Sciences, King’s College London, London, United Kingdom
| | - Daniel Fovargue
- School of Biomedical Engineering and Imaging Sciences, King’s College London, London, United Kingdom
| | - Adela Capilnasiu
- School of Biomedical Engineering and Imaging Sciences, King’s College London, London, United Kingdom
| | | | - David Nordsletten
- School of Biomedical Engineering and Imaging Sciences, King’s College London, London, United Kingdom
- Department of Biomedical Engineering and Cardiac Surgery, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Ralph Sinkus
- School of Biomedical Engineering and Imaging Sciences, King’s College London, London, United Kingdom
- U1148, INSERM, Hôpital Bichat, Paris, France
| | - Jack Lee
- School of Biomedical Engineering and Imaging Sciences, King’s College London, London, United Kingdom
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10
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Dong H, Jin N, Kannengiesser S, Raterman B, White RD, Kolipaka A. Magnetic resonance elastography for estimating in vivo stiffness of the abdominal aorta using cardiac-gated spin-echo echo-planar imaging: a feasibility study. NMR IN BIOMEDICINE 2021; 34:e4420. [PMID: 33021342 DOI: 10.1002/nbm.4420] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 09/02/2020] [Accepted: 09/10/2020] [Indexed: 06/11/2023]
Abstract
INTRODUCTION Magnetic resonance elastography (MRE)-derived aortic stiffness is a potential biomarker for multiple cardiovascular diseases. Currently, gradient-recalled echo (GRE) MRE is a widely accepted technique to estimate aortic stiffness. However, multi-slice GRE MRE requires multiple breath-holds (BHs), which can be challenging for patients who cannot consistently hold their breath. The aim of this study was to investigate the feasibility of a multi-slice spin-echo echo-planar imaging (SE-EPI) MRE sequence for quantifying in vivo aortic stiffness using a free-breathing (FB) protocol and a single-BH protocol. METHOD On Scanner 1, 25 healthy subjects participated in the validation of FB SE-EPI against FB GRE. On Scanner 2, another 15 healthy subjects were recruited to compare FB SE-EPI with single-BH SE-EPI. Among all volunteers, five participants were studied on both scanners to investigate the inter-scanner reproducibility of FB SE-EPI aortic MRE. Bland-Altman analysis, Lin's concordance correlation coefficient (LCCC) and coefficient of variation (COV) were evaluated. The phase-difference signal-to-noise ratios (PD SNR) were compared. RESULTS Aortic MRE using FB SE-EPI and FB GRE yielded similar stiffnesses (paired t-test, P = 0.19), with LCCC = 0.97. The FB SE-EPI measurements were reproducible (intra-scanner LCCC = 0.96) and highly repeatable (LCCC = 0.99). The FB SE-EPI MRE was also reproducible across different scanners (inter-scanner LCCC = 0.96). Single-BH SE-EPI scans yielded similar stiffness to FB SE-EPI scans (LCCC = 0.99) and demonstrated a low COV of 2.67% across five repeated measurements. CONCLUSION Multi-slice SE-EPI aortic MRE using an FB protocol or a single-BH protocol is reproducible and repeatable with advantage over multi-slice FB GRE in reducing acquisition time. Additionally, FB SE-EPI MRE provides a potential alternative to BH scans for patients who have challenges in holding their breath.
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Affiliation(s)
- Huiming Dong
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Ning Jin
- Siemens Medical Solution, Columbus, Ohio, USA
| | | | - Brian Raterman
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Richard D White
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA
- Department of Internal Medicine-Division of Cardiology, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Arunark Kolipaka
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA
- Department of Internal Medicine-Division of Cardiology, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
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11
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Thanaboonnipat C, Sutayatram S, Buranakarl C, Choisunirachon N. Renal ultrasonographic strain elastography and symmetric dimethylarginine (SDMA) in canine and feline chronic kidney disease. J Vet Med Sci 2020; 82:1104-1112. [PMID: 32554935 PMCID: PMC7468054 DOI: 10.1292/jvms.19-0496] [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] [Indexed: 11/22/2022] Open
Abstract
Chronic kidney disease (CKD) is a common renal disease in dogs and cats. Renal fibrosis
is a main pathologic process leading of CKD progression. Renal biopsy is the gold standard
for renal fibrosis assessment. However, it is not routinely performed in clinic due to its
invasiveness. Therefore, the aim of this study was to evaluate the use of ultrasonographic
strain elastography (SE), which is a non-invasive method for renal tissue stiffness
determination and its association with renal function. Renal strain ratios and renal
function were evaluated in 13 CKD dogs (CKDD), 38 healthy dogs (HD), 17 CKD cats (CKDC)
and 26 healthy cats (HC). There were significantly lower renal cortical strain ratios than
medullary strain ratios in all groups (HD; P<0.01, HC;
P<0.01, CKDD and CKDC; P<0.05) and significantly
lower cortical and medullary strain ratios in both CKDD and CKDC than in healthy control
animals of both species (P<0.0001). In dogs, the renal cortical and
medullary strain ratios significantly negatively correlated with plasma creatinine
(P<0.05), blood urea nitrogen (BUN; P<0.05;
P<0.01, respectively), and symmetric dimethylarginine (SDMA;
P<0.01). In cats, similar correlations were found for plasma
creatinine (P<0.001), BUN (P<0.05;
P<0.001, respectively) and SDMA (P<0.05). SE
might be a promising imaging diagnostic tool for renal-elasticity evaluation, also
correlating with renal functional impairment in canine and feline CKD.
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Affiliation(s)
- Chutimon Thanaboonnipat
- Department of Veterinary Physiology, Faculty of Veterinary Science, Chulalongkorn University, 39 Henri-Dunant Road, Wangmai, Pathumwan, Bangkok, Thailand.,Department of Veterinary Surgery, Faculty of Veterinary Science, Chulalongkorn University, 39 Henri-Dunant Road, Wangmai, Pathumwan, Bangkok, Thailand
| | - Saikaew Sutayatram
- Department of Veterinary Physiology, Faculty of Veterinary Science, Chulalongkorn University, 39 Henri-Dunant Road, Wangmai, Pathumwan, Bangkok, Thailand
| | - Chollada Buranakarl
- Department of Veterinary Physiology, Faculty of Veterinary Science, Chulalongkorn University, 39 Henri-Dunant Road, Wangmai, Pathumwan, Bangkok, Thailand
| | - Nan Choisunirachon
- Department of Veterinary Surgery, Faculty of Veterinary Science, Chulalongkorn University, 39 Henri-Dunant Road, Wangmai, Pathumwan, Bangkok, Thailand
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12
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Distler T, McDonald K, Heid S, Karakaya E, Detsch R, Boccaccini AR. Ionically and Enzymatically Dual Cross-Linked Oxidized Alginate Gelatin Hydrogels with Tunable Stiffness and Degradation Behavior for Tissue Engineering. ACS Biomater Sci Eng 2020; 6:3899-3914. [PMID: 33463325 DOI: 10.1021/acsbiomaterials.0c00677] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Hydrogels that allow for the successful long-term in vitro culture of cell-biomaterial systems to enable the maturation of tissue engineering constructs are highly relevant in regenerative medicine. Naturally derived polysaccharide-based hydrogels promise to be one material group with enough versatility and chemical functionalization capability to tackle the challenges associated with long-term cell culture. We report a marine derived oxidized alginate, alginate dialdehyde (ADA), and gelatin (GEL) system (ADA-GEL), which is cross-linked via ionic (Ca2+) and enzymatic (microbial transglutaminase, mTG) interaction to form dually cross-linked hydrogels. The cross-linking approach allowed us to tailor the stiffness of the hydrogels in a wide range (from <5 to 120 kPa), without altering the initial ADA and GEL hydrogel chemistry. It was possible to control the degradation behavior of the hydrogels to be stable for up to 30 days of incubation. Increasing concentrations of mTG cross-linker solutions allowed us to tune the degradation behavior of the ADA-GEL hydrogels from fast (<7 days) to moderate (14 days) and slow (>30 days) degradation kinetics. The cytocompatibility of mTG cross-linked ADA-GEL was assessed using NIH-3T3 fibroblasts and ATDC-5 mouse teratocarcinoma cells. Both cell types showed highly increased cellular attachment on mTG cross-linked ADA-GEL in comparison to Ca2+ cross-linked hydrogels. In addition, ATDC-5 cells showed a higher proliferation on mTG cross-linked ADA-GEL hydrogels in comparison to tissue culture polystyrene control substrates. Further, the attachment of human umbilical vein endothelial cells (HUVEC) on ADA-GEL (+) mTG was confirmed, proving the suitability of mTG+Ca2+ cross-linked ADA-GEL for several cell types. Summarizing, a promising platform to control the properties of ADA-GEL hydrogels is presented, with the potential to be applied in long-term cell culture investigations such as cartilage, bone, and blood-vessel engineering, as well as for biofabrication.
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Affiliation(s)
- Thomas Distler
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany
| | - Kilian McDonald
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany
| | - Susanne Heid
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany
| | - Emine Karakaya
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany
| | - Rainer Detsch
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany
| | - Aldo R Boccaccini
- Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstr. 6, 91058 Erlangen, Germany
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13
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Gandhi D, Kalra P, Raterman B, Mo X, Dong H, Kolipaka A. Magnetic resonance elastography-derived stiffness of the kidneys and its correlation with water perfusion. NMR IN BIOMEDICINE 2020; 33:e4237. [PMID: 31889353 PMCID: PMC7060814 DOI: 10.1002/nbm.4237] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 09/23/2019] [Accepted: 11/10/2019] [Indexed: 05/09/2023]
Abstract
Stiffness plays an important role in diagnosing renal fibrosis. However, kidney stiffness is altered by perfusion changes in many kidney diseases. Therefore, the aim of the current study is to determine the correlation of kidney stiffness with water intake. We hypothesize that kidney stiffness will increase with 1 L of water intake due to increased water perfusion to the kidneys. Additionally, stiffness of the kidneys will correlate with apparent diffusion coefficient (ADC) and fractional anisotropy (FA) values before and after water intake. A 3 T MRI scanner was used to perform magnetic resonance elastography and diffusion tensor imaging of the kidneys on 24 healthy subjects (age range: 22-66 years) before and after water intake of 1 L. A 3D T1-weighted bladder scan was also performed to measure bladder volume before and after water intake. A paired t-test was performed to evaluate the effect of water intake on the stiffness of kidneys, in addition to bladder volume. A Spearman correlation test was performed to determine the association between stiffness, bladder volume, ADC and FA values of both kidneys before and after water intake. The results show a significant increase in stiffness in different regions of the kidney (ie, percentage increase ranged from 3.6% to 7.5%) and bladder volume after water intake (all P < 0.05). A moderate significant negative correlation was observed between change in kidney stiffness and bladder volume (concordance correlation coefficient = -0.468, P < 0.05). No significant correlation was observed between stiffness and ADC or FA values before and after water intake in both kidneys (P > 0.05). Water intake caused a significant increase in the stiffness of the kidneys. The negative correlation between the change in kidney stiffness and bladder volume, before and after water intake, indicates higher perfusion pressure in the kidneys, leading to increased stiffness.
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Affiliation(s)
- Deep Gandhi
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - Prateek Kalra
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - Brian Raterman
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - Xiaokui Mo
- Center for Biostatistics, Department of Biomedical Informatics, The Ohio State University, Columbus, OH
| | - Huiming Dong
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - Arunark Kolipaka
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, OH
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14
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Kim YA, Chun SY, Park SB, Kang E, Koh WG, Kwon TG, Han DK, Joung YK. Scaffold-supported extracellular matrices preserved by magnesium hydroxide nanoparticles for renal tissue regeneration. Biomater Sci 2020; 8:5427-5440. [DOI: 10.1039/d0bm00871k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Fibroblast-derived extracellular matrix-supported scaffolds made up of PLGA were prepared with the enhanced preservation of ECM components by composites with magnesium hydroxide nanoparticles, and were applied for renal tissue regeneration.
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Affiliation(s)
- Yun Ah Kim
- Center for Biomaterials
- Biomedical Research Institute
- Korea Institute of Science and Technology
- Seoul
- Korea
| | - So Young Chun
- BioMedical Research Institute
- Kyungpook National University Hospital
- Daegu
- Korea
| | - Sung-Bin Park
- Department of Biomedical Science
- College of Life Sciences
- CHA University
- Sungnam
- Korea
| | - Eunyoung Kang
- Department of Biomedical Science
- College of Life Sciences
- CHA University
- Sungnam
- Korea
| | - Won-Gun Koh
- Department of Chemical and Biomolecular Engineering
- Yonsei University
- Seoul
- Korea
| | - Tae Gyun Kwon
- Department of Urology
- Kyungpook National University
- Kyungbuk
- Korea
| | - Dong Keun Han
- Department of Biomedical Science
- College of Life Sciences
- CHA University
- Sungnam
- Korea
| | - Yoon Ki Joung
- Center for Biomaterials
- Biomedical Research Institute
- Korea Institute of Science and Technology
- Seoul
- Korea
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15
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Gandhi D, Kalra P, Raterman B, Mo X, Dong H, Kolipaka A. Magnetic Resonance Elastography of kidneys: SE-EPI MRE reproducibility and its comparison to GRE MRE. NMR IN BIOMEDICINE 2019; 32:e4141. [PMID: 31329347 PMCID: PMC6817380 DOI: 10.1002/nbm.4141] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 05/09/2019] [Accepted: 06/17/2019] [Indexed: 05/10/2023]
Abstract
The purpose of this study is 1) to demonstrate reproducibility of spin echo-echo planar imaging (SE-EPI) magnetic resonance elastography (MRE) to estimate kidney stiffness; and 2) to compare SE-EPI MRE and gradient recalled echo (GRE) MRE-derived stiffness estimations in various anatomical regions of the kidney. Kidney MRE was performed on 33 healthy subjects (8 for SE-EPI MRE reproducibility and 25 for comparison with GRE MRE; age range: 22-66 years) in a 3 T MRI scanner. To demonstrate SE-EPI MRE reproducibility, subjects were scanned for the first scan and then asked to leave the scan room and repositioned again for the second (repeat) scan. Similar set-up was used for GRE MRE as well. The displacement data was then processed to obtain overall stiffness estimates of the kidney. Concordance correlation analyses were performed to determine SE-EPI MRE reproducibility and agreement between GRE MRE and SE-EPI MRE derived stiffness. A high concordance correlation (ρc = 0.95; p-value<0.0001) was obtained for SE-EPI MRE reproducibility. Good concordance correlation was observed (ρc = 0.84; p < 0.0001 for both kidneys, ρc = 0.91; p < 0.0001 for right kidney and ρc = 0.78; p < 0.0001 for left kidney) between GRE MRE and SE-EPI MRE derived stiffness measurements. Paired t-test results showed that stiffness value of medulla was significantly (p < 0.0001) greater than cortex using SE-EPI MRE as well as GRE MRE. SE-EPI MRE was reproducible and good agreement was observed in MRE-derived stiffness measurements obtained using SE-EPI and GRE sequences. Therefore, SE-EPI can be used for kidney MRE applications.
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Affiliation(s)
- Deep Gandhi
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - Prateek Kalra
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - Brian Raterman
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - Xiaokui Mo
- Center for Biostatistics, Department of Biomedical Informatics, The Ohio State University, Columbus, OH
| | - Huiming Dong
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, OH
| | - Arunark Kolipaka
- Department of Biomedical Engineering, The Ohio State University, Columbus, OH
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, OH
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16
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Sagreiya H, Akhbardeh A, Li D, Sigrist R, Chung BI, Sonn GA, Tian L, Rubin DL, Willmann JK. Point Shear Wave Elastography Using Machine Learning to Differentiate Renal Cell Carcinoma and Angiomyolipoma. ULTRASOUND IN MEDICINE & BIOLOGY 2019; 45:1944-1954. [PMID: 31133445 PMCID: PMC6689386 DOI: 10.1016/j.ultrasmedbio.2019.04.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Revised: 03/31/2019] [Accepted: 04/03/2019] [Indexed: 05/09/2023]
Abstract
The question of whether ultrasound point shear wave elastography can differentiate renal cell carcinoma (RCC) from angiomyolipoma (AML) is controversial. This study prospectively enrolled 51 patients with 52 renal tumors (42 RCCs, 10 AMLs). We obtained 10 measurements of shear wave velocity (SWV) in the renal tumor, cortex and medulla. Median SWV was first used to classify RCC versus AML. Next, the prediction accuracy of 4 machine learning algorithms-logistic regression, naïve Bayes, quadratic discriminant analysis and support vector machines (SVMs)-was evaluated, using statistical inputs from the tumor, cortex and combined statistical inputs from tumor, cortex and medulla. After leave-one-out cross validation, models were evaluated using the area under the receiver operating characteristic (ROC) curve (AUC). Tumor median SWV performed poorly (AUC = 0.62; p = 0.23). Except logistic regression, all machine learning algorithms reached statistical significance using combined statistical inputs (AUC = 0.78-0.98; p < 7.1 × 10-3). SVMs demonstrated 94% accuracy (AUC = 0.98; p = 3.13 × 10-6) and clearly outperformed median SWV in differentiating RCC from AML (p = 2.8 × 10-4).
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Affiliation(s)
- Hersh Sagreiya
- Department of Radiology, Stanford University School of Medicine, Stanford, CA, USA
| | - Alireza Akhbardeh
- Department of Radiology, Stanford University School of Medicine, Stanford, CA, USA
| | - Dandan Li
- Department of Radiology, Stanford University School of Medicine, Stanford, CA, USA
| | - Rosa Sigrist
- Department of Radiology, Stanford University School of Medicine, Stanford, CA, USA
| | - Benjamin I Chung
- Department of Urology, Stanford University School of Medicine, Stanford, CA, USA
| | - Geoffrey A Sonn
- Department of Radiology, Stanford University School of Medicine, Stanford, CA, USA; Department of Urology, Stanford University School of Medicine, Stanford, CA, USA
| | - Lu Tian
- Department of Health, Research & Policy, Stanford University, Stanford, CA, USA
| | - Daniel L Rubin
- Department of Radiology, Stanford University School of Medicine, Stanford, CA, USA; Department of Biomedical Data Science, Stanford University, Stanford, CA, USA; Department of Medicine (Biomedical Informatics Research), Stanford University, Stanford, CA, USA.
| | - Jürgen K Willmann
- Department of Radiology, Stanford University School of Medicine, Stanford, CA, USA
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17
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New and Emerging Applications of Magnetic Resonance Elastography of Other Abdominal Organs. Top Magn Reson Imaging 2019; 27:335-352. [PMID: 30289829 DOI: 10.1097/rmr.0000000000000182] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Increasing clinical experience and ongoing research in the field of magnetic resonance elastography (MRE) is leading to exploration of its applications in other abdominal organs. In this review, the current research progress of MRE in prostate, uterus, pancreas, spleen, and kidney will be discussed. The article will describe patient preparation, modified technical approach including development of passive drivers, modification of sequences, and inversion. The potential clinical application of MRE in the evaluation of several disease processes affecting these organs will be discussed. In an era of increasing adoption of multiparametric magnetic resonance imaging approaches for solving complex abdominal problems, abdominal MRE as a biomarker may be seamlessly incorporated into a standard magnetic resonance imaging examination to provide a rapid, reliable, and comprehensive imaging evaluation at a single patient appointment in the future.
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18
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Hiraki HL, Nagao RJ, Himmelfarb J, Zheng Y. Fabricating a Kidney Cortex Extracellular Matrix-Derived Hydrogel. J Vis Exp 2018:58314. [PMID: 30371659 PMCID: PMC6235530 DOI: 10.3791/58314] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Extracellular matrix (ECM) provides important biophysical and biochemical cues to maintain tissue homeostasis. Current synthetic hydrogels offer robust mechanical support for in vitro cell culture but lack the necessary protein and ligand composition to elicit physiological behavior from cells. This manuscript describes a fabrication method for a kidney cortex ECM-derived hydrogel with proper mechanical robustness and supportive biochemical composition. The hydrogel is fabricated by mechanically homogenizing and solubilizing decellularized human kidney cortex ECM. The matrix preserves native kidney cortex ECM protein ratios while also enabling gelation to physiological mechanical stiffnesses. The hydrogel serves as a substrate upon which kidney cortex-derived cells can be maintained under physiological conditions. Furthermore, the hydrogel composition can be manipulated to model a diseased environment which enables the future study of kidney diseases.
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Affiliation(s)
| | - Ryan J Nagao
- Department of Bioengineering, Center for Cardiovascular Biology, Institute for Stem Cell and Regenerative Medicine, University of Washington
| | - Jonathan Himmelfarb
- Department of Medicine, Kidney Research Institute, University of Washington;
| | - Ying Zheng
- Department of Bioengineering, Center for Cardiovascular Biology, Institute for Stem Cell and Regenerative Medicine, University of Washington;
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19
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Genderen AM, Jansen J, Cheng C, Vermonden T, Masereeuw R. Renal Tubular- and Vascular Basement Membranes and their Mimicry in Engineering Vascularized Kidney Tubules. Adv Healthc Mater 2018; 7:e1800529. [PMID: 30091856 DOI: 10.1002/adhm.201800529] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 07/18/2018] [Indexed: 01/09/2023]
Abstract
The high prevalence of chronic kidney disease leads to an increased need for renal replacement therapies. While there are simply not enough donor organs available for transplantation, there is a need to seek other therapeutic avenues as current dialysis modalities are insufficient. The field of regenerative medicine and whole organ engineering is emerging, and researchers are looking for innovative ways to create (part of) a functional new organ. To biofabricate a kidney or its functional units, it is necessary to understand and learn from physiology to be able to mimic the specific tissue properties. Herein is provided an overview of the knowledge on tubular and vascular basement membranes' biochemical components and biophysical properties, and the major differences between the two basement membranes are highlighted. Furthermore, an overview of current trends in membrane technology for developing renal replacement therapies and to stimulate kidney regeneration is provided.
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Affiliation(s)
- Anne Metje Genderen
- Division of PharmacologyUtrecht Institute for Pharmaceutical Sciences 3584 CG Utrecht The Netherlands
| | - Jitske Jansen
- Division of PharmacologyUtrecht Institute for Pharmaceutical Sciences 3584 CG Utrecht The Netherlands
| | - Caroline Cheng
- Regenerative Medicine Center UtrechtUniversity Medical Center Utrecht 3584 CT Utrecht The Netherlands
- Department of Nephrology and HypertensionUniversity Medical Center Utrecht 3508 GA Utrecht The Netherlands
- Department of Experimental CardiologyErasmus Medical Center 3015 GD Rotterdam The Netherlands
| | - Tina Vermonden
- Division of PharmaceuticsUtrecht Institute for Pharmaceutical Sciences 3584 CG Utrecht The Netherlands
| | - Rosalinde Masereeuw
- Division of PharmacologyUtrecht Institute for Pharmaceutical Sciences 3584 CG Utrecht The Netherlands
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20
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Guenthner C, Kozerke S. Encoding and readout strategies in magnetic resonance elastography. NMR IN BIOMEDICINE 2018; 31:e3919. [PMID: 29806865 DOI: 10.1002/nbm.3919] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Revised: 12/15/2017] [Accepted: 02/15/2018] [Indexed: 06/08/2023]
Abstract
Magnetic resonance elastography (MRE) has evolved significantly since its inception. Advances in motion-encoding gradient design and readout strategies have led to improved encoding and signal-to-noise ratio (SNR) efficiencies, which in turn allow for higher spatial resolution, increased coverage, and/or shorter scan times. The purpose of this review is to summarize MRE wave-encoding and readout approaches in a unified mathematical framework to allow for a comparative assessment of encoding and SNR efficiency of the various methods available. Besides standard full- and fractional-wave-encoding approaches, advanced techniques including flow compensation, sample interval modulation and multi-shot encoding are considered. Signal readout using fast k-space trajectories, reduced field of view, multi-slice, and undersampling techniques are summarized and put into perspective. The review is concluded with a foray into displacement and diffusion encoding as alternative and/or complementary techniques.
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Affiliation(s)
- Christian Guenthner
- Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland
| | - Sebastian Kozerke
- Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland
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21
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Fovargue D, Nordsletten D, Sinkus R. Stiffness reconstruction methods for MR elastography. NMR IN BIOMEDICINE 2018; 31:e3935. [PMID: 29774974 PMCID: PMC6175248 DOI: 10.1002/nbm.3935] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Revised: 03/27/2018] [Accepted: 03/27/2018] [Indexed: 05/19/2023]
Abstract
Assessment of tissue stiffness is desirable for clinicians and researchers, as it is well established that pathophysiological mechanisms often alter the structural properties of tissue. Magnetic resonance elastography (MRE) provides an avenue for measuring tissue stiffness and has a long history of clinical application, including staging liver fibrosis and stratifying breast cancer malignancy. A vital component of MRE consists of the reconstruction algorithms used to derive stiffness from wave-motion images by solving inverse problems. A large range of reconstruction methods have been presented in the literature, with differing computational expense, required user input, underlying physical assumptions, and techniques for numerical evaluation. These differences, in turn, have led to varying accuracy, robustness, and ease of use. While most reconstruction techniques have been validated against in silico or in vitro phantoms, performance with real data is often more challenging, stressing the robustness and assumptions of these algorithms. This article reviews many current MRE reconstruction methods and discusses the aforementioned differences. The material assumptions underlying the methods are developed and various approaches for noise reduction, regularization, and numerical discretization are discussed. Reconstruction methods are categorized by inversion type, underlying assumptions, and their use in human and animal studies. Future directions, such as alternative material assumptions, are also discussed.
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Affiliation(s)
- Daniel Fovargue
- Imaging Sciences & Biomedical EngineeringKing's College LondonLondonUK
| | - David Nordsletten
- Imaging Sciences & Biomedical EngineeringKing's College LondonLondonUK
| | - Ralph Sinkus
- Imaging Sciences & Biomedical EngineeringKing's College LondonLondonUK
- Inserm U1148, LVTSUniversity Paris Diderot, University Paris 13Paris75018France
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Yu SM, Oh JM, Lee J, Lee-Kwon W, Jung W, Amblard F, Granick S, Cho YK. Substrate curvature affects the shape, orientation, and polarization of renal epithelial cells. Acta Biomater 2018; 77:311-321. [PMID: 30006316 DOI: 10.1016/j.actbio.2018.07.019] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 06/25/2018] [Accepted: 07/09/2018] [Indexed: 10/28/2022]
Abstract
The unique structure of kidney tubules is representative of their specialized function. Because maintaining tubular structure and controlled diameter is critical for kidney function, it is critical to understand how topographical cues, such as curvature, might alter cell morphology and biological characteristics. Here, we examined the effect of substrate curvature on the shape and phenotype of two kinds of renal epithelial cells (MDCK and HK-2) cultured on a microchannel with a broad range of principal curvature. We found that cellular architecture on curved substrates was closely related to the cell type-specific characteristics (stiffness, cell-cell adherence) of the cells and their density, as well as the sign and degree of curvature. As the curvature increased on convex channels, HK-2 cells, having lower cell stiffness and monolayer integrity than those of MDCK cells, aligned their in-plane axis perpendicular to the channel but did not significantly change in morphology. By contrast, MDCK cells showed minimal change in both morphology and alignment. However, on concave channels, both cell types were elongated and showed longitudinal directionality, although the changes in MDCK cells were more conservative. Moreover, substrate curvature contributed to cell polarization by enhancing the expression of apical and basolateral cell markers with height increase of the cells. Our study suggests curvature to be an important guiding principle for advanced tissue model developments, and that curved and geometrically ambiguous substrates can modulate the cellular morphology and phenotype. STATEMENT OF SIGNIFICANCE In many tissues, such as renal tubules or intestinal villi, epithelial layers exist in naturally curved forms, a geometry that is not reproduced by flat cultures. Because maintaining tubular structure is critical for kidney function, it is important to understand how topographical cues, such as curvature, might alter cell morphology and biological characteristics. We found that cellular architecture on curved substrates was closely related to cell type and density, as well as the sign and degree of the curvature. Moreover, substrate curvature contributed to cell polarization by enhancing the expression of apical and basolateral cell markers with height increase. Our results suggested that substrate curvature might contribute to cellular architecture and enhance the polarization of kidney tubule cells.
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Ito D, Numano T, Mizuhara K, Washio T, Misawa M, Nitta N. Development of a robust diffusion-MR elastography (dMRE) technique to mitigate intravoxel phase dispersion. Magn Reson Imaging 2018; 54:160-170. [PMID: 30171999 DOI: 10.1016/j.mri.2018.08.016] [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: 01/25/2018] [Revised: 08/21/2018] [Accepted: 08/27/2018] [Indexed: 10/28/2022]
Abstract
Diffusion-magnetic resonance elastography (dMRE) is an emerging practical technique that can acquire diffusion magnetic resonance imaging and MRE simultaneously. However, a signal loss attributable to intravoxel phase dispersion (IVPD) interferes with the calculation of the apparent diffusion coefficient (ADC). This study presents an approach to dMRE that reduces the influence of IVPD by introducing a new pulse sequence. The existing and proposed techniques were performed using a phantom comprising five rods with different elasticities at 60 Hz vibration to investigate the accuracy of previous and proposed dMRE techniques. The measures of ADC and stiffness, obtained by using both dMRE techniques, were compared with conventional spin-echo (SE) diffusion and SE-MRE. Then, we evaluated those differences by using the mean of absolute differences (MAD) in each rod within the phantom. The results of the MAD of the stiffness from both dMRE techniques showed almost no difference. In contrast, the value of the ADC MAD (MAD ≒ 0.16 × 10-3 mm2/s), obtained in the soft region within the phantom with the previous dMRE technique, was large. This value was about 2.7 times that of the value produced by the proposed dMRE technique. This difference must reflect the degree of influence of IVPD in both techniques. These results demonstrate that our dMRE technique is a robust method for addressing the signal loss attributable to IVPD.
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Affiliation(s)
- Daiki Ito
- Department of Radiological Sciences, Graduate School of Human Health Sciences, Tokyo Metropolitan University, 7-2-10, Higashiogu, Arakawa-ku, Tokyo 116-8551, Japan; Health Research Institute, National Institute of Advanced Industrial Science and Technology, 1-2-1, Namiki, Tsukuba-shi, Ibaraki 305-8564, Japan; Office of Radiation Technology, Keio University Hospital, Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
| | - Tomokazu Numano
- Department of Radiological Sciences, Graduate School of Human Health Sciences, Tokyo Metropolitan University, 7-2-10, Higashiogu, Arakawa-ku, Tokyo 116-8551, Japan; Health Research Institute, National Institute of Advanced Industrial Science and Technology, 1-2-1, Namiki, Tsukuba-shi, Ibaraki 305-8564, Japan.
| | - Kazuyuki Mizuhara
- Health Research Institute, National Institute of Advanced Industrial Science and Technology, 1-2-1, Namiki, Tsukuba-shi, Ibaraki 305-8564, Japan; Department of Mechanical Engineering, Tokyo Denki University, 5, Senju Asahicho, Adachi-ku, Tokyo 120-8551, Japan
| | - Toshikatsu Washio
- Health Research Institute, National Institute of Advanced Industrial Science and Technology, 1-2-1, Namiki, Tsukuba-shi, Ibaraki 305-8564, Japan
| | - Masaki Misawa
- Health Research Institute, National Institute of Advanced Industrial Science and Technology, 1-2-1, Namiki, Tsukuba-shi, Ibaraki 305-8564, Japan
| | - Naotaka Nitta
- Health Research Institute, National Institute of Advanced Industrial Science and Technology, 1-2-1, Namiki, Tsukuba-shi, Ibaraki 305-8564, Japan
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Indentation of heterogeneous soft tissue: Local constitutive parameter mapping using an inverse method and an automated rig. J Mech Behav Biomed Mater 2018; 78:515-528. [DOI: 10.1016/j.jmbbm.2017.03.033] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Revised: 03/27/2017] [Accepted: 03/31/2017] [Indexed: 01/21/2023]
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25
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Marticorena Garcia SR, Grossmann M, Lang ST, Tzschätzsch H, Dittmann F, Hamm B, Braun J, Guo J, Sack I. Tomoelastography of the native kidney: Regional variation and physiological effects on in vivo renal stiffness. Magn Reson Med 2017; 79:2126-2134. [DOI: 10.1002/mrm.26892] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 07/17/2017] [Accepted: 08/08/2017] [Indexed: 12/21/2022]
Affiliation(s)
| | - Markus Grossmann
- Department of RadiologyCharité ‐ Universitätsmedizin BerlinBerlin Germany
| | | | - Heiko Tzschätzsch
- Department of RadiologyCharité ‐ Universitätsmedizin BerlinBerlin Germany
| | - Florian Dittmann
- Department of RadiologyCharité ‐ Universitätsmedizin BerlinBerlin Germany
| | - Bernd Hamm
- Department of RadiologyCharité ‐ Universitätsmedizin BerlinBerlin Germany
| | - Jürgen Braun
- Institute of Medical Informatics, Charité ‐ Universitätsmedizin BerlinBerlin Germany
| | - Jing Guo
- Department of RadiologyCharité ‐ Universitätsmedizin BerlinBerlin Germany
| | - Ingolf Sack
- Department of RadiologyCharité ‐ Universitätsmedizin BerlinBerlin Germany
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26
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Rianna C, Radmacher M. Influence of microenvironment topography and stiffness on the mechanics and motility of normal and cancer renal cells. NANOSCALE 2017; 9:11222-11230. [PMID: 28752168 DOI: 10.1039/c7nr02940c] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The tumor microenvironment highly influences cancer cell modes and dynamics, above all during invasive and metastatic processes. When aiming at studying cancer cell behavior in vitro, the use of conventional cell culture systems, such as Petri dishes, fails in recapitulating the mechanical and topographical properties of the natural extracellular matrix (ECM). Here the versatility of stiffness-tunable hydrogels and the efficacy of the replica molding technique with silicone polymers are exploited, aiming at studying cancer and normal cell behavior with platforms able to capture the heterogeneities of the natural in vivo context. We compared the mechanical properties of normal and cancer renal cells on different stiffness value gels (with Young's moduli of 3, 17 and 31 kPa) by using atomic force microscopy (AFM) and investigated cell indentation phenomena on compliant gels with confocal microscopy. Moreover, we studied cell mechanics, morphology and migration on isotropic linear structures, spaced at 1.5 μm, aiming at mimicking the aligned fiber bundles typically observed at tumor borders. By using this approach, we could highlight differences in the way healthy and cancer renal cells react to changes in their microenvironment. Our results may potentially pave the way to unravel the complex processes involved in cancer progression, especially in tissue invasion and migration during metastasis formation.
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Affiliation(s)
- C Rianna
- Institute of Biophysics, University of Bremen, Otto-Hahn Allee 1, D-28359 Bremen, Germany.
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27
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Fukuda SP, Matsui TS, Ichikawa T, Furukawa T, Kioka N, Fukushima S, Deguchi S. Cellular force assay detects altered contractility caused by a nephritis-associated mutation in nonmuscle myosin IIA. Dev Growth Differ 2017; 59:423-433. [PMID: 28714588 DOI: 10.1111/dgd.12379] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 05/01/2017] [Accepted: 05/20/2017] [Indexed: 12/31/2022]
Abstract
Recent progress in understanding the essential roles of mechanical forces in regulating various cellular processes expands the field of biology to one where interdisciplinary approaches with engineering techniques become indispensable. Contractile forces or contractility-inherently present in proliferative cells due to the activity of ubiquitous nonmuscle myosin II (NMII)-are one of such mechano-regulators, but because NMII works downstream of diverse signaling pathways, it is often difficult to predict how the inherent cellular forces change upon perturbations to particular molecules. Here, we determine whether the contractility of individual cells is upregulated or downregulated based on an assay analyzing specific deformations of silicone gel substrates. We focus on the effect of mutations in the human MYH9 gene that encodes NMIIA, which have been implicated in the pathogenesis of various diseases including nephritis. Our assay equipped with a high-throughput data analysis capability reveals that a point mutation of E1841K but not I1816V significantly reduces the magnitude of the endogenous forces of human embryonic kidney (HEK293) cells. Given the increasingly recognized roles of the endogenous forces as a critical mechano-regulator as well as that no apparent morphological changes were induced to cells even by introducing the mutations, our findings suggest a possibility that the detected reduction in the force magnitude at the individual cellular level may underlie the pathogenesis of the kidney disease.
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Affiliation(s)
- Shota P Fukuda
- Division of Bioengineering, Graduate School of Engineering Science, Osaka University, Toyonaka, 560-8531, Japan
| | - Tsubasa S Matsui
- Division of Bioengineering, Graduate School of Engineering Science, Osaka University, Toyonaka, 560-8531, Japan
| | - Takafumi Ichikawa
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan.,Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto, 606-8507, Japan
| | - Taichi Furukawa
- Division of Bioengineering, Graduate School of Engineering Science, Osaka University, Toyonaka, 560-8531, Japan.,Institute for NanoScience Design, Osaka University, Toyonaka, 560-8531
| | - Noriyuki Kioka
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan.,Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto, 606-8507, Japan
| | - Shuichiro Fukushima
- Division of Bioengineering, Graduate School of Engineering Science, Osaka University, Toyonaka, 560-8531, Japan
| | - Shinji Deguchi
- Division of Bioengineering, Graduate School of Engineering Science, Osaka University, Toyonaka, 560-8531, Japan
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28
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Jansen K, Schuurmans CCL, Jansen J, Masereeuw R, Vermonden T. Hydrogel-Based Cell Therapies for Kidney Regeneration: Current Trends in Biofabrication and In Vivo Repair. Curr Pharm Des 2017; 23:3845-3857. [PMID: 28699526 PMCID: PMC6302346 DOI: 10.2174/1381612823666170710155726] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Revised: 06/05/2017] [Accepted: 06/19/2017] [Indexed: 01/14/2023]
Abstract
Facing the problems of limited renal regeneration capacity and the persistent shortage of donor kidneys, dialysis remains the only treatment option for many end-stage renal disease patients. Unfortunately, dialysis is only a medium-term solution because large and protein-bound uremic solutes are not efficiently cleared from the body and lead to disease progression over time. Current strategies for improved renal replacement therapies (RRTs) range from whole organ engineering to biofabrication of renal assist devices and biological injectables for in vivo regeneration. Notably, all approaches coincide with the incorporation of cellular components and biomimetic micro-environments. Concerning the latter, hydrogels form promising materials as scaffolds and cell carrier systems due to the demonstrated biocompatibility of most natural hydrogels, tunable biochemical and mechanical properties, and various application possibilities. In this review, the potential of hydrogel-based cell therapies for kidney regeneration is discussed. First, we provide an overview of current trends in the development of RRTs and in vivo regeneration options, before examining the possible roles of hydrogels within these fields. We discuss major application-specific hydrogel design criteria and, subsequently, assess the potential of emergent biofabrication technologies, such as micromolding, microfluidics and electrodeposition for the development of new RRTs and injectable stem cell therapies.
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Affiliation(s)
- Katja Jansen
- Utrecht University Div. Pharmacology Department of Pharmaceutical Sciences Universiteitsweg 99, 3584 CG Utrecht. Netherlands
| | - Carl C L Schuurmans
- Utrecht University Div. Pharmacology Department of Pharmaceutical Sciences Universiteitsweg 99, 3584 CG Utrecht. Netherlands
| | - Jitske Jansen
- Utrecht University Div. Pharmacology Department of Pharmaceutical Sciences Universiteitsweg 99, 3584 CG Utrecht. Netherlands
| | - Rosalinde Masereeuw
- Utrecht University Div. Pharmacology Department of Pharmaceutical Sciences Universiteitsweg 99, 3584 CG Utrecht. Netherlands
| | - Tina Vermonden
- Utrecht University Div. Pharmacology Department of Pharmaceutical Sciences Universiteitsweg 99, 3584 CG Utrecht. Netherlands
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29
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Hiscox LV, Johnson CL, Barnhill E, McGarry MDJ, Huston J, van Beek EJR, Starr JM, Roberts N. Magnetic resonance elastography (MRE) of the human brain: technique, findings and clinical applications. Phys Med Biol 2016; 61:R401-R437. [DOI: 10.1088/0031-9155/61/24/r401] [Citation(s) in RCA: 132] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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30
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Homan KA, Kolesky DB, Skylar-Scott MA, Herrmann J, Obuobi H, Moisan A, Lewis JA. Bioprinting of 3D Convoluted Renal Proximal Tubules on Perfusable Chips. Sci Rep 2016; 6:34845. [PMID: 27725720 PMCID: PMC5057112 DOI: 10.1038/srep34845] [Citation(s) in RCA: 361] [Impact Index Per Article: 45.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 09/19/2016] [Indexed: 02/08/2023] Open
Abstract
Three-dimensional models of kidney tissue that recapitulate human responses are needed for drug screening, disease modeling, and, ultimately, kidney organ engineering. Here, we report a bioprinting method for creating 3D human renal proximal tubules in vitro that are fully embedded within an extracellular matrix and housed in perfusable tissue chips, allowing them to be maintained for greater than two months. Their convoluted tubular architecture is circumscribed by proximal tubule epithelial cells and actively perfused through the open lumen. These engineered 3D proximal tubules on chip exhibit significantly enhanced epithelial morphology and functional properties relative to the same cells grown on 2D controls with or without perfusion. Upon introducing the nephrotoxin, Cyclosporine A, the epithelial barrier is disrupted in a dose-dependent manner. Our bioprinting method provides a new route for programmably fabricating advanced human kidney tissue models on demand.
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Affiliation(s)
- Kimberly A. Homan
- School of Engineering and Applied Sciences, Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, Massachusetts, United States of America
- Pharmaceutical Sciences, Roche Pharma Research and Early Development, Roche Innovation Center, Basel, Switzerland
| | - David B. Kolesky
- School of Engineering and Applied Sciences, Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, Massachusetts, United States of America
| | - Mark A. Skylar-Scott
- School of Engineering and Applied Sciences, Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, Massachusetts, United States of America
| | - Jessica Herrmann
- School of Engineering and Applied Sciences, Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, Massachusetts, United States of America
| | - Humphrey Obuobi
- School of Engineering and Applied Sciences, Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, Massachusetts, United States of America
| | - Annie Moisan
- Pharmaceutical Sciences, Roche Pharma Research and Early Development, Roche Innovation Center, Basel, Switzerland
| | - Jennifer A. Lewis
- School of Engineering and Applied Sciences, Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, Massachusetts, United States of America
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31
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Dittmann F, Tzschätzsch H, Hirsch S, Barnhill E, Braun J, Sack I, Guo J. Tomoelastography of the abdomen: Tissue mechanical properties of the liver, spleen, kidney, and pancreas from single MR elastography scans at different hydration states. Magn Reson Med 2016; 78:976-983. [DOI: 10.1002/mrm.26484] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 08/17/2016] [Accepted: 09/07/2016] [Indexed: 12/11/2022]
Affiliation(s)
- Florian Dittmann
- Department of Radiology; Charité - Universitätsmedizin Berlin; Berlin Germany
| | - Heiko Tzschätzsch
- Department of Radiology; Charité - Universitätsmedizin Berlin; Berlin Germany
| | - Sebastian Hirsch
- Department of Radiology; Charité - Universitätsmedizin Berlin; Berlin Germany
| | - Eric Barnhill
- Department of Radiology; Charité - Universitätsmedizin Berlin; Berlin Germany
| | - Jürgen Braun
- Department of Medical Informatics; Charité - Universitätsmedizin Berlin; Berlin Germany
| | - Ingolf Sack
- Department of Radiology; Charité - Universitätsmedizin Berlin; Berlin Germany
| | - Jing Guo
- Department of Radiology; Charité - Universitätsmedizin Berlin; Berlin Germany
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32
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Multifrequency Magnetic Resonance Elastography for the Assessment of Renal Allograft Function. Invest Radiol 2016; 51:591-5. [DOI: 10.1097/rli.0000000000000271] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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33
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Payen T, Palermo CF, Sastra SA, Chen H, Han Y, Olive KP, Konofagou EE. Elasticity mapping of murine abdominal organs in vivo using harmonic motion imaging (HMI). Phys Med Biol 2016; 61:5741-54. [PMID: 27401609 PMCID: PMC5048218 DOI: 10.1088/0031-9155/61/15/5741] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Recently, ultrasonic imaging of soft tissue mechanics has been increasingly studied to image otherwise undetectable pathologies. However, many underlying mechanisms of tissue stiffening remain unknown, requiring small animal studies and adapted elasticity mapping techniques. Harmonic motion imaging (HMI) assesses tissue viscoelasticity by inducing localized oscillation from a periodic acoustic radiation force. The objective of this study was to evaluate the feasibility of HMI for in vivo elasticity mapping of abdominal organs in small animals. Pathological cases, i.e. chronic pancreatitis and pancreatic cancer, were also studied in vivo to assess the capability of HMI for detection of the change in mechanical properties. A 4.5 MHz focused ultrasound transducer (FUS) generated an amplitude-modulated beam resulting in 50 Hz harmonic tissue oscillations at its focus. Axial tissue displacement was estimated using 1D-cross-correlation of RF signals acquired with a 7.8 MHz diagnostic transducer confocally aligned with the FUS. In vitro results in canine liver and kidney showed the correlation between HMI displacement and Young's moduli measured by rheometry compression testing. HMI was capable of providing reproducible elasticity maps of the mouse abdominal region in vivo allowing the identification of, from stiffest to softest, the murine kidney, pancreas, liver, and spleen. Finally, pancreata affected by pancreatitis and pancreatic cancer showed HMI displacements 1.7 and 2.2 times lower than in the control case, respectively, indicating higher stiffness. The HMI displacement amplitude was correlated with the extent of fibrosis as well as detecting the very onset of stiffening even before fibrosis could be detected on H&E. This work shows that HMI can produce reliable elasticity maps of mouse abdominal region in vivo, thus providing a potentially critical tool to assess pathologies affecting organ elasticity.
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Affiliation(s)
- Thomas Payen
- Biomedical Engineering, Columbia University, USA
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34
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Chakouch MK, Pouletaut P, Charleux F, Bensamoun SF. Viscoelastic shear properties of in vivo thigh muscles measured by MR elastography. J Magn Reson Imaging 2015; 43:1423-33. [DOI: 10.1002/jmri.25105] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Accepted: 11/10/2015] [Indexed: 12/25/2022] Open
Affiliation(s)
- Mashhour K. Chakouch
- Biomechanics and Bioengineering Laboratory, UMR CNRS 7338, Sorbonne University, Université de Technologie de Compiègne; Compiègne France
| | - Philippe Pouletaut
- Biomechanics and Bioengineering Laboratory, UMR CNRS 7338, Sorbonne University, Université de Technologie de Compiègne; Compiègne France
| | | | - Sabine F. Bensamoun
- Biomechanics and Bioengineering Laboratory, UMR CNRS 7338, Sorbonne University, Université de Technologie de Compiègne; Compiègne France
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35
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Pepin KM, Ehman RL, McGee KP. Magnetic resonance elastography (MRE) in cancer: Technique, analysis, and applications. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2015; 90-91:32-48. [PMID: 26592944 PMCID: PMC4660259 DOI: 10.1016/j.pnmrs.2015.06.001] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 06/15/2015] [Accepted: 06/16/2015] [Indexed: 05/07/2023]
Abstract
Tissue mechanical properties are significantly altered with the development of cancer. Magnetic resonance elastography (MRE) is a noninvasive technique capable of quantifying tissue mechanical properties in vivo. This review describes the basic principles of MRE and introduces some of the many promising MRE methods that have been developed for the detection and characterization of cancer, evaluation of response to therapy, and investigation of the underlying mechanical mechanisms associated with malignancy.
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36
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Low G, Owen NE, Joubert I, Patterson AJ, Graves MJ, Glaser KJ, Alexander GJM, Lomas DJ. Reliability of magnetic resonance elastography using multislice two-dimensional spin-echo echo-planar imaging (SE-EPI) and three-dimensional inversion reconstruction for assessing renal stiffness. J Magn Reson Imaging 2015; 42:844-50. [PMID: 25537823 PMCID: PMC4560097 DOI: 10.1002/jmri.24826] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Accepted: 12/01/2014] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND To evaluate the reliability of MRE using a spin-echo echo-planar imaging (SE-EPI) renal MRE technique in healthy volunteers. METHODS Institutional review board approved prospective study in which all participants provided written informed consent. Sixteen healthy volunteers comprising seven males and nine females with a median age of 35 years (age range: 23 to 59 years) were included. Coronal 90 Hz and 60 Hz MRE acquisitions were performed twice within a 30-min interval between examinations. Renal MRE reliability was assessed by (i) test-retest repeatability, and (ii) inter-rater agreement between two independent readers. The MRE-measured averaged renal stiffness values were evaluated using: intraclass correlation coefficient (ICC), Bland-Altman and the within-subject coefficient of variation (COV). RESULTS For test-retest repeatability, Bland-Altman showed a mean stiffness difference between examinations of 0.07 kPa (95% limits of agreement: -1.41, 1.54) at 90 Hz and 0.01 kPa (95% limits of agreement: -0.51, 0.53) at 60 Hz. Coefficient of repeatability was 1.47 kPa and 0.52 kPa at 90 Hz and 60 Hz, respectively. The within-subject COV was 13.6% and 7.7% at 90 Hz and 60 Hz, respectively. ICC values were 0.922 and 0.907 for test-retest repeatability and 0.998 and 0.989 for inter-rater agreement, respectively (P < 0.001). CONCLUSION SE-EPI renal MRE is a reliable technique.
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Affiliation(s)
- Gavin Low
- Department of Radiology, Addenbrooke's Hospital, University of Cambridge, England, United Kingdom
- University of Alberta, Edmonton, Alberta, Canada
| | - Nicola E Owen
- Division of Gastroenterology & Hepatology, Cambridge University Hospitals NHS Foundation Trust Hospital, England, United Kingdom
| | - Ilse Joubert
- Department of Radiology, Addenbrooke's Hospital, University of Cambridge, England, United Kingdom
| | - Andrew J Patterson
- Department of Radiology, Addenbrooke's Hospital, University of Cambridge, England, United Kingdom
| | - Martin J Graves
- Department of Radiology, Addenbrooke's Hospital, University of Cambridge, England, United Kingdom
| | - Kevin J Glaser
- Department of Radiology, Mayo Clinic, Rochester, Minnesota, USA
| | - Graeme J M Alexander
- Division of Gastroenterology & Hepatology, Cambridge University Hospitals NHS Foundation Trust Hospital, England, United Kingdom
| | - David J Lomas
- Department of Radiology, Addenbrooke's Hospital, University of Cambridge, England, United Kingdom
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Ladoux B, Nelson WJ, Yan J, Mège RM. The mechanotransduction machinery at work at adherens junctions. Integr Biol (Camb) 2015; 7:1109-19. [PMID: 25968913 DOI: 10.1039/c5ib00070j] [Citation(s) in RCA: 94] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The shaping of a multicellular body, and the maintenance and repair of adult tissues require fine-tuning of cell adhesion responses and the transmission of mechanical load between the cell, its neighbors and the underlying extracellular matrix. A growing field of research is focused on how single cells sense mechanical properties of their micro-environment (extracellular matrix, other cells), and on how mechanotransduction pathways affect cell shape, migration, survival as well as differentiation. Within multicellular assemblies, the mechanical load imposed by the physical properties of the environment is transmitted to neighboring cells. Force imbalance at cell-cell contacts induces essential morphogenetic processes such as cell-cell junction remodeling, cell polarization and migration, cell extrusion and cell intercalation. However, how cells respond and adapt to the mechanical properties of neighboring cells, transmit forces, and transform mechanical signals into chemical signals remain open questions. A defining feature of compact tissues is adhesion between cells at the specialized adherens junction (AJ) involving the cadherin super-family of Ca(2+)-dependent cell-cell adhesion proteins (e.g., E-cadherin in epithelia). Cadherins bind to the cytoplasmic protein β-catenin, which in turn binds to the filamentous (F)-actin binding adaptor protein α-catenin, which can also recruit vinculin, making the mechanical connection between cell-cell adhesion proteins and the contractile actomyosin cytoskeleton. The cadherin-catenin adhesion complex is a key component of the AJ, and contributes to cell assembly stability and dynamic cell movements. It has also emerged as the main route of propagation of forces within epithelial and non-epithelial tissues. Here, we discuss recent molecular studies that point toward force-dependent conformational changes in α-catenin that regulate protein interactions in the cadherin-catenin adhesion complex, and show that α-catenin is the core mechanosensor that allows cells to locally sense, transduce and adapt to environmental mechanical constrains.
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Affiliation(s)
- B Ladoux
- Institut Jacques Monod, CNRS, Université Paris Diderot, Paris, France.
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Li M, Miller K, Joldes GR, Doyle B, Garlapati RR, Kikinis R, Wittek A. Patient-specific biomechanical model as whole-body CT image registration tool. Med Image Anal 2015; 22:22-34. [PMID: 25721296 PMCID: PMC4405489 DOI: 10.1016/j.media.2014.12.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 08/08/2014] [Accepted: 12/13/2014] [Indexed: 10/24/2022]
Abstract
Whole-body computed tomography (CT) image registration is important for cancer diagnosis, therapy planning and treatment. Such registration requires accounting for large differences between source and target images caused by deformations of soft organs/tissues and articulated motion of skeletal structures. The registration algorithms relying solely on image processing methods exhibit deficiencies in accounting for such deformations and motion. We propose to predict the deformations and movements of body organs/tissues and skeletal structures for whole-body CT image registration using patient-specific non-linear biomechanical modelling. Unlike the conventional biomechanical modelling, our approach for building the biomechanical models does not require time-consuming segmentation of CT scans to divide the whole body into non-overlapping constituents with different material properties. Instead, a Fuzzy C-Means (FCM) algorithm is used for tissue classification to assign the constitutive properties automatically at integration points of the computation grid. We use only very simple segmentation of the spine when determining vertebrae displacements to define loading for biomechanical models. We demonstrate the feasibility and accuracy of our approach on CT images of seven patients suffering from cancer and aortic disease. The results confirm that accurate whole-body CT image registration can be achieved using a patient-specific non-linear biomechanical model constructed without time-consuming segmentation of the whole-body images.
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Affiliation(s)
- Mao Li
- Intelligent Systems for Medicine Laboratory, School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley, Perth, Australia
| | - Karol Miller
- Intelligent Systems for Medicine Laboratory, School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley, Perth, Australia; Institute of Mechanics and Advanced Materials, Cardiff School of Engineering, Cardiff University, Cardiff, Wales, UK
| | - Grand Roman Joldes
- Intelligent Systems for Medicine Laboratory, School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley, Perth, Australia
| | - Barry Doyle
- Vascular Engineering, Intelligent Systems for Medicine Laboratory, School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley, Perth, Australia; Centre for Cardiovascular Science, The University of Edinburgh, Edinburgh, UK
| | - Revanth Reddy Garlapati
- Intelligent Systems for Medicine Laboratory, School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley, Perth, Australia
| | - Ron Kikinis
- Surgical Planning Laboratory, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Fraunhofer MEVIS, Bremen, Germany; Professor für Medical Image Computing, MZH, University of Bremen, Bremen, Germany
| | - Adam Wittek
- Intelligent Systems for Medicine Laboratory, School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley, Perth, Australia.
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Ultrasound Elastography and MR Elastography for Assessing Liver Fibrosis: Part 2, Diagnostic Performance, Confounders, and Future Directions. AJR Am J Roentgenol 2015; 205:33-40. [PMID: 25905762 DOI: 10.2214/ajr.15.14553] [Citation(s) in RCA: 142] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
OBJECTIVE The purpose of the article is to review the diagnostic performance of ultra-sound and MR elastography techniques for detection and staging of liver fibrosis, the main current clinical applications of elastography in the abdomen. CONCLUSION Technical and instrument-related factors and biologic and patient-related factors may constitute potential confounders of stiffness measurements for assessment of liver fibrosis. Future developments may expand the scope of elastography for monitoring liver fibrosis and predict complications of chronic liver disease.
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Jeon S, Lee G, Lee SK, Kim H, Yu D, Choi J. ULTRASONOGRAPHIC ELASTOGRAPHY OF THE LIVER, SPLEEN, KIDNEYS, AND PROSTATE IN CLINICALLY NORMAL BEAGLE DOGS. Vet Radiol Ultrasound 2015; 56:425-31. [DOI: 10.1111/vru.12238] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Accepted: 11/19/2014] [Indexed: 12/11/2022] Open
Affiliation(s)
- Sunghoon Jeon
- College of Veterinary Medicine; Chonnam National University; Gwangju 500-757 Republic of Korea
| | - Gahyun Lee
- College of Veterinary Medicine; Chonnam National University; Gwangju 500-757 Republic of Korea
| | - Sang-Kwon Lee
- College of Veterinary Medicine; Chonnam National University; Gwangju 500-757 Republic of Korea
| | - Hyunwoo Kim
- College of Veterinary Medicine; Chonnam National University; Gwangju 500-757 Republic of Korea
| | - Dohyeon Yu
- College of Veterinary Medicine; Chonnam National University; Gwangju 500-757 Republic of Korea
| | - Jihye Choi
- College of Veterinary Medicine; Chonnam National University; Gwangju 500-757 Republic of Korea
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Role of Three-Dimensional Matrix Stiffness in Regulating the Response of Human Neural Cells to Toxins. Cell Mol Bioeng 2014. [DOI: 10.1007/s12195-014-0326-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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Streitberger KJ, Guo J, Tzschätzsch H, Hirsch S, Fischer T, Braun J, Sack I. High-resolution mechanical imaging of the kidney. J Biomech 2013; 47:639-44. [PMID: 24355382 DOI: 10.1016/j.jbiomech.2013.11.051] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Revised: 08/13/2013] [Accepted: 11/27/2013] [Indexed: 01/07/2023]
Abstract
The objective of this study was to test the feasibility and reproducibility of in vivo high-resolution mechanical imaging of the asymptomatic human kidney. Hereby nine volunteers were examined at three different physiological states of urinary bladder filling (a normal state, urinary urgency, and immediately after urinary relief). Mechanical imaging was performed of the in vivo kidney using three-dimensional multifrequency magnetic resonance elastography combined with multifrequency dual elastovisco inversion. Other than in classical elastography, where the storage and loss shear moduli are evaluated, we analyzed the magnitude |G(⁎)| and the phase angle φ of the complex shear modulus reconstructed by simultaneous inversion of full wave field data corresponding to 7 harmonic drive frequencies from 30 to 60Hz and a resolution of 2.5mm cubic voxel size. Mechanical parameter maps were derived with a spatial resolution superior to that in previous work. The group-averaged values of |G(⁎)| were 2.67±0.52kPa in the renal medulla, 1.64±0.17kPa in the cortex, and 1.17±0.21kPa in the hilus. The phase angle φ (in radians) was 0.89±0.12 in the medulla, 0.83±0.09 in the cortex, and 0.72±0.06 in the hilus. All regional differences were significant (P<0.001), while no significant variation was found in relation to different stages of bladder filling. In summary our study provides first high-resolution maps of viscoelastic parameters of the three anatomical regions of the kidney. |G(⁎)| and φ provide novel information on the viscoelastic properties of the kidney, which is potentially useful for the detection of renal lesions or fibrosis.
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Affiliation(s)
| | - Jing Guo
- Department of Radiology, Charité - Universitätsmedizin Berlin, Campus Charité Mitte, Berlin, Germany
| | - Heiko Tzschätzsch
- Department of Radiology, Charité - Universitätsmedizin Berlin, Campus Charité Mitte, Berlin, Germany
| | - Sebastian Hirsch
- Department of Radiology, Charité - Universitätsmedizin Berlin, Campus Charité Mitte, Berlin, Germany
| | - Thomas Fischer
- Department of Radiology, Charité - Universitätsmedizin Berlin, Campus Charité Mitte, Berlin, Germany
| | - Jürgen Braun
- Institute of Medical Informatics, Charité - Universitätsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany
| | - Ingolf Sack
- Department of Radiology, Charité - Universitätsmedizin Berlin, Campus Charité Mitte, Berlin, Germany.
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Leclerc GE, Charleux F, Ho Ba Tho MC, Bensamoun SF. Identification process based on shear wave propagation within a phantom using finite element modelling and magnetic resonance elastography. Comput Methods Biomech Biomed Engin 2013; 18:485-91. [PMID: 23947476 DOI: 10.1080/10255842.2013.818664] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Magnetic resonance elastography (MRE), based on shear wave propagation generated by a specific driver, is a non-invasive exam performed in clinical practice to improve the liver diagnosis. The purpose was to develop a finite element (FE) identification method for the mechanical characterisation of phantom mimicking soft tissues investigated with MRE technique. Thus, a 3D FE phantom model, composed of the realistic MRE liver boundary conditions, was developed to simulate the shear wave propagation with the software ABAQUS. The assumptions of homogeneity and elasticity were applied to the FE phantom model. Different ranges of mesh size, density and Poisson's ratio were tested in order to develop the most representative FE phantom model. The simulated wave displacement was visualised with a dynamic implicit analysis. Subsequently, an identification process was performed with a cost function and an optimisation loop provided the optimal elastic properties of the phantom. The present identification process was validated on a phantom model, and the perspective will be to apply this method on abdominal tissues for the set-up of new clinical MRE protocols that could be applied for the follow-up of the effects of treatments.
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Affiliation(s)
- Gwladys E Leclerc
- a Laboratoire de BioMécanique et BioIngénierie, Centre de Recherches de Royallieu, Université de Technologie de Compiègne (UTC) , UMR CNRS 7338, Rue Personne de Roberval, BP 20529, 60205 Compiègne Cedex , France
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Chen J, Yin M, Glaser KJ, Talwalkar JA, Ehman RL. MR elastography of liver disease: State of the art. APPLIED RADIOLOGY 2013. [DOI: 10.37549/ar1982] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Debernard L, Robert L, Charleux F, Bensamoun SF. A possible clinical tool to depict muscle elasticity mapping using magnetic resonance elastography. Muscle Nerve 2013; 47:903-8. [PMID: 23512304 DOI: 10.1002/mus.23678] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/11/2012] [Indexed: 01/11/2023]
Abstract
INTRODUCTION Characterization of muscle elasticity will improve the diagnosis and treatment of muscle disorders. The purpose is to compare the use of magnetic resonance elastography (MRE) and ultrasound elastography (USE) techniques to elucidate the MRE cartography of thigh muscles. METHODS Both elastography techniques were performed on 5 children and 7 adults. Quantitative (MRE) and qualitative (USE) cartographies of muscle elasticity, as a function of muscle state and age, were obtained with shear waves and manual compression of the ultrasound probe, respectively. RESULTS Similar cartographies of muscle elasticity were obtained with the 2 methods. The combination of both imaging techniques results in an improved depiction of the physiological changes associated with muscle state and age. CONCLUSIONS This study demonstrates the feasibility of MRE for use as a clinical tool in the characterization of neuromuscular pathologies and for assessing the efficacy of specific treatments for muscle related diseases.
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Affiliation(s)
- Laëtitia Debernard
- Biomechanics and Bioengineery Laboratory, UMR CNRS 7338, Université de Technologie de Compiègne, Centre de Recherches de Royallieu, BP 20529, 60205 Compiègne, Cedex, France
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Majewicz A, Marra SP, van Vledder MG, Lin M, Choti MA, Song DY, Okamura AM. Behavior of tip-steerable needles in ex vivo and in vivo tissue. IEEE Trans Biomed Eng 2012; 59:2705-15. [PMID: 22711767 DOI: 10.1109/tbme.2012.2204749] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Robotic needle steering is a promising technique to improve the effectiveness of needle-based clinical procedures, such as biopsies and ablation, by computer-controlled, curved insertions of needles within solid organs. In this paper, we explore the capabilities, challenges, and clinical relevance of asymmetric-tip needle steering through experiments in ex vivo and in vivo tissue. We evaluate the repeatability of needle insertion in inhomogeneous biological tissue and compare ex vivo and in vivo needle curvature and insertion forces. Steerable needles curved more in kidney than in liver and prostate, likely due to differences in tissue properties. Pre-bent needles produced higher insertion forces in liver and more curvature in vivo than ex vivo. When compared to straight stainless steel needles, steerable needles did not cause a measurable increase in tissue damage and did not exert more force during insertion. The minimum radius of curvature achieved by prebent needles was 5.23 cm in ex vivo tissue, and 10.4 cm in in vivo tissue. The curvatures achieved by bevel tip needles were negligible for in vivo tissue. The minimum radius of curvature for bevel tip needles in ex vivo tissue was 16.4 cm; however, about half of the bevel tip needles had negligible curvatures. We also demonstrate a potential clinical application of needle steering by targeting and ablating overlapping regions of cadaveric canine liver.
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Affiliation(s)
- Ann Majewicz
- Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA.
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