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Poudrel AS, Bouffandeau A, Demeet OL, Rosi G, Nguyen VH, Haiat G. Characterization of the concentration of agar-based soft tissue mimicking phantoms by impact analysis. J Mech Behav Biomed Mater 2024; 152:106465. [PMID: 38377641 DOI: 10.1016/j.jmbbm.2024.106465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Revised: 01/14/2024] [Accepted: 02/13/2024] [Indexed: 02/22/2024]
Abstract
In various medical fields, a change of soft tissue stiffness is associated with its physio-pathological evolution. While elastography is extensively employed to assess soft tissue stiffness in vivo, its application requires a complex and expensive technology. The aim of this study is to determine whether an easy-to-use method based on impact analysis can be employed to determine the concentration of agar-based soft tissue mimicking phantoms. Impact analysis was performed on soft tissue mimicking phantoms made of agar gel with a mass concentration ranging from 1% to 5%. An indicator Δt is derived from the temporal variation of the impact force signal between the hammer and a small beam in contact with the sample. The results show a non-linear decrease of Δt as a function of the agar concentration (and thus of the sample stiffness). The value of Δt provides an estimation of the agar concentration with an error of 0.11%. This sensitivity of the impact analysis based method to the agar concentration is of the same order of magnitude than results obtained with elastography techniques. This study opens new paths towards the development of impact analysis for a fast, easy and relatively inexpensive clinical evaluation of soft tissue elastic properties.
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Affiliation(s)
- Anne-Sophie Poudrel
- CNRS, Univ Paris Est Creteil, Univ Gustave Eiffel, UMR 8208, MSME, F-94010 Créteil, France
| | - Arthur Bouffandeau
- CNRS, Univ Paris Est Creteil, Univ Gustave Eiffel, UMR 8208, MSME, F-94010 Créteil, France
| | - Oriane Le Demeet
- CNRS, Univ Paris Est Creteil, Univ Gustave Eiffel, UMR 8208, MSME, F-94010 Créteil, France
| | - Giuseppe Rosi
- Univ Paris Est Creteil, Univ Gustave Eiffel, CNRS, UMR 8208, MSME, F-94010 Créteil, France
| | - Vu-Hieu Nguyen
- Univ Paris Est Creteil, Univ Gustave Eiffel, CNRS, UMR 8208, MSME, F-94010 Créteil, France
| | - Guillaume Haiat
- CNRS, Univ Paris Est Creteil, Univ Gustave Eiffel, UMR 8208, MSME, F-94010 Créteil, France.
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2
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Lemine AS, Ahmad Z, Al-Thani NJ, Hasan A, Bhadra J. Mechanical properties of human hepatic tissues to develop liver-mimicking phantoms for medical applications. Biomech Model Mechanobiol 2024; 23:373-396. [PMID: 38072897 DOI: 10.1007/s10237-023-01785-4] [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: 05/08/2023] [Accepted: 10/17/2023] [Indexed: 03/26/2024]
Abstract
Using liver phantoms for mimicking human tissue in clinical training, disease diagnosis, and treatment planning is a common practice. The fabrication material of the liver phantom should exhibit mechanical properties similar to those of the real liver organ in the human body. This tissue-equivalent material is essential for qualitative and quantitative investigation of the liver mechanisms in producing nutrients, excretion of waste metabolites, and tissue deformity at mechanical stimulus. This paper reviews the mechanical properties of human hepatic tissues to develop liver-mimicking phantoms. These properties include viscosity, elasticity, acoustic impedance, sound speed, and attenuation. The advantages and disadvantages of the most common fabrication materials for developing liver tissue-mimicking phantoms are also highlighted. Such phantoms will give a better insight into the real tissue damage during the disease progression and preservation for transplantation. The liver tissue-mimicking phantom will raise the quality assurance of patient diagnostic and treatment precision and offer a definitive clinical trial data collection.
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Affiliation(s)
- Aicha S Lemine
- Department of Mechanical and Industrial Engineering, College of Engineering, Qatar University, 2713, Doha, Qatar
- Qatar University Young Scientists Center (QUYSC), Qatar University, 2713, Doha, Qatar
| | - Zubair Ahmad
- Qatar University Young Scientists Center (QUYSC), Qatar University, 2713, Doha, Qatar
- Center for Advanced Materials (CAM), Qatar University, PO Box 2713, Doha, Qatar
| | - Noora J Al-Thani
- Qatar University Young Scientists Center (QUYSC), Qatar University, 2713, Doha, Qatar
| | - Anwarul Hasan
- Department of Mechanical and Industrial Engineering, College of Engineering, Qatar University, 2713, Doha, Qatar
| | - Jolly Bhadra
- Qatar University Young Scientists Center (QUYSC), Qatar University, 2713, Doha, Qatar.
- Center for Advanced Materials (CAM), Qatar University, PO Box 2713, Doha, Qatar.
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3
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Jeffreys N, Brockman JM, Zhai Y, Ingber DE, Mooney DJ. Mechanical forces amplify TCR mechanotransduction in T cell activation and function. APPLIED PHYSICS REVIEWS 2024; 11:011304. [PMID: 38434676 PMCID: PMC10848667 DOI: 10.1063/5.0166848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 12/08/2023] [Indexed: 03/05/2024]
Abstract
Adoptive T cell immunotherapies, including engineered T cell receptor (eTCR) and chimeric antigen receptor (CAR) T cell immunotherapies, have shown efficacy in treating a subset of hematologic malignancies, exhibit promise in solid tumors, and have many other potential applications, such as in fibrosis, autoimmunity, and regenerative medicine. While immunoengineering has focused on designing biomaterials to present biochemical cues to manipulate T cells ex vivo and in vivo, mechanical cues that regulate their biology have been largely underappreciated. This review highlights the contributions of mechanical force to several receptor-ligand interactions critical to T cell function, with central focus on the TCR-peptide-loaded major histocompatibility complex (pMHC). We then emphasize the role of mechanical forces in (i) allosteric strengthening of the TCR-pMHC interaction in amplifying ligand discrimination during T cell antigen recognition prior to activation and (ii) T cell interactions with the extracellular matrix. We then describe approaches to design eTCRs, CARs, and biomaterials to exploit TCR mechanosensitivity in order to potentiate T cell manufacturing and function in adoptive T cell immunotherapy.
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Affiliation(s)
| | | | - Yunhao Zhai
- Wyss Institute for Biologically Inspired Engineering, Boston, Massachusetts 02115, USA
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McCarthy CM, McKevitt KL, Connolly SA, Andersson I, Leahy FC, Egan S, Moloney MA, Kavanagh EG, Peirce C, Cunnane EM, McGourty KD, Walsh MT, Mulvihill JJE. Microindentation of fresh soft biological tissue: A rapid tissue sectioning and mounting protocol. PLoS One 2024; 19:e0297618. [PMID: 38422111 PMCID: PMC10903917 DOI: 10.1371/journal.pone.0297618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 01/03/2024] [Indexed: 03/02/2024] Open
Abstract
Microindentation of fresh biological tissues is necessary for the creation of 3D biomimetic models that accurately represent the native extracellular matrix microenvironment. However, tissue must first be precisely sectioned into slices. Challenges exist in the preparation of fresh tissue slices, as they can tear easily and must be processed rapidly in order to mitigate tissue degradation. In this study, we propose an optimised mounting condition for microindentation and demonstrate that embedding tissue in a mixture of 2.5% agarose and 1.5% gelatin is the most favourable method of tissue slice mounting for microindentation. This protocol allows for rapid processing of fresh biological tissue and is applicable to a variety of tissue types.
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Affiliation(s)
- Clíona M. McCarthy
- Biomaterials Cluster, Bernal Institute, University of Limerick, Limerick, Ireland
- School of Engineering, University of Limerick, Limerick, Ireland
| | - Kevin L. McKevitt
- Department of Vascular & Endovascular Surgery, University Hospital Limerick, Limerick, Ireland
| | - Sinéad A. Connolly
- Biomaterials Cluster, Bernal Institute, University of Limerick, Limerick, Ireland
- School of Engineering, University of Limerick, Limerick, Ireland
| | - Isabel Andersson
- Biomaterials Cluster, Bernal Institute, University of Limerick, Limerick, Ireland
- School of Engineering, University of Limerick, Limerick, Ireland
| | - Fiona C. Leahy
- Department of Vascular & Endovascular Surgery, University Hospital Limerick, Limerick, Ireland
| | - Siobhan Egan
- Department of Colorectal Surgery, University Hospital Limerick, Limerick, Ireland
| | - Michael A. Moloney
- Department of Vascular & Endovascular Surgery, University Hospital Limerick, Limerick, Ireland
| | - Eamon G. Kavanagh
- Department of Vascular & Endovascular Surgery, University Hospital Limerick, Limerick, Ireland
| | - Colin Peirce
- Department of Colorectal Surgery, University Hospital Limerick, Limerick, Ireland
| | - Eoghan M. Cunnane
- Biomaterials Cluster, Bernal Institute, University of Limerick, Limerick, Ireland
- School of Engineering, University of Limerick, Limerick, Ireland
- Health Research Institute, University of Limerick, Limerick, Ireland
| | - Kieran D. McGourty
- Biomaterials Cluster, Bernal Institute, University of Limerick, Limerick, Ireland
- School of Engineering, University of Limerick, Limerick, Ireland
- School of Chemical Sciences, University of Limerick, Limerick, Ireland
| | - Michael T. Walsh
- Biomaterials Cluster, Bernal Institute, University of Limerick, Limerick, Ireland
- School of Engineering, University of Limerick, Limerick, Ireland
- Health Research Institute, University of Limerick, Limerick, Ireland
| | - John J. E. Mulvihill
- Biomaterials Cluster, Bernal Institute, University of Limerick, Limerick, Ireland
- School of Engineering, University of Limerick, Limerick, Ireland
- Health Research Institute, University of Limerick, Limerick, Ireland
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5
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Kalwa PL, Schäffer TE. Water flow elastography - A promising tool to measure tissue stiffness during minimally invasive surgery. J Mech Behav Biomed Mater 2023; 145:106004. [PMID: 37418969 DOI: 10.1016/j.jmbbm.2023.106004] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 06/29/2023] [Accepted: 06/30/2023] [Indexed: 07/09/2023]
Abstract
Mechanical properties are important markers for pathological processes in tissue. Elastography techniques are therefore becoming more and more useful for diagnostics. In minimally invasive surgery (MIS), however, the probe size is limited and the handling is restricted, thereby excluding the application of most established elastography techniques. In this paper we introduce water flow elastography (WaFE) as a new technique that benefits from a small and inexpensive probe. This probe flows pressurized water against the sample surface to locally indent it. The volume of the indentation is measured with a flow meter. We use finite element simulations to find the relation between the indentation volume, the water pressure, and the Young's modulus of the sample. We used WaFE to measure the Young's modulus of silicone samples and porcine organs, finding agreement within 10% to measurements with a commercial material testing machine. Our results show that WaFE is a promising technique for providing local elastography in MIS.
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Affiliation(s)
- Paul L Kalwa
- Institute of Applied Physics, University of Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
| | - Tilman E Schäffer
- Institute of Applied Physics, University of Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany.
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Zhang Y, Wang Z, Sun Q, Li Q, Li S, Li X. Dynamic Hydrogels with Viscoelasticity and Tunable Stiffness for the Regulation of Cell Behavior and Fate. MATERIALS (BASEL, SWITZERLAND) 2023; 16:5161. [PMID: 37512435 PMCID: PMC10386333 DOI: 10.3390/ma16145161] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 07/16/2023] [Accepted: 07/19/2023] [Indexed: 07/30/2023]
Abstract
The extracellular matrix (ECM) of natural cells typically exhibits dynamic mechanical properties (viscoelasticity and dynamic stiffness). The viscoelasticity and dynamic stiffness of the ECM play a crucial role in biological processes, such as tissue growth, development, physiology, and disease. Hydrogels with viscoelasticity and dynamic stiffness have recently been used to investigate the regulation of cell behavior and fate. This article first emphasizes the importance of tissue viscoelasticity and dynamic stiffness and provides an overview of characterization techniques at both macro- and microscale. Then, the viscoelastic hydrogels (crosslinked via ion bonding, hydrogen bonding, hydrophobic interactions, and supramolecular interactions) and dynamic stiffness hydrogels (softening, stiffening, and reversible stiffness) with different crosslinking strategies are summarized, along with the significant impact of viscoelasticity and dynamic stiffness on cell spreading, proliferation, migration, and differentiation in two-dimensional (2D) and three-dimensional (3D) cell cultures. Finally, the emerging trends in the development of dynamic mechanical hydrogels are discussed.
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Affiliation(s)
- Yuhang Zhang
- School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China (Q.L.)
- National Center for International Joint Research of Micro-Nano Moulding Technology, Zhengzhou University, Zhengzhou 450001, China
| | - Zhuofan Wang
- School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China (Q.L.)
- National Center for International Joint Research of Micro-Nano Moulding Technology, Zhengzhou University, Zhengzhou 450001, China
| | - Qingqing Sun
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Qian Li
- School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China (Q.L.)
- National Center for International Joint Research of Micro-Nano Moulding Technology, Zhengzhou University, Zhengzhou 450001, China
| | - Shaohui Li
- School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Xiaomeng Li
- School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China (Q.L.)
- National Center for International Joint Research of Micro-Nano Moulding Technology, Zhengzhou University, Zhengzhou 450001, China
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7
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González-Sierra NE, Perez-Corte JM, Padilla-Martinez JP, Cruz-Vanegas S, Bonfadini S, Storti F, Criante L, Ramos-García R. Bubble dynamics and speed of jets for needle-free injections produced by thermocavitation. JOURNAL OF BIOMEDICAL OPTICS 2023; 28:075004. [PMID: 37484974 PMCID: PMC10362157 DOI: 10.1117/1.jbo.28.7.075004] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 05/11/2023] [Accepted: 06/02/2023] [Indexed: 07/25/2023]
Abstract
Significance The number of injections administered has increased dramatically worldwide due to vaccination campaigns following the COVID-19 pandemic, creating a problem of disposing of syringes and needles. Accidental needle sticks occur among medical and cleaning staff, exposing them to highly contagious diseases, such as hepatitis and human immunodeficiency virus. In addition, needle phobia may prevent adequate treatment. To overcome these problems, we propose a needle-free injector based on thermocavitation. Aim Experimentally study the dynamics of vapor bubbles produced by thermocavitation inside a fully buried 3D fused silica chamber and the resulting high-speed jets emerging through a small nozzle made at the top of it. The injected volume can range from ∼ 0.1 to 2 μ L per shot. We also demonstrate that these jets have the ability to penetrate agar skin phantoms and ex-vivo porcine skin. Approach Through the use of a high-speed camera, the dynamics of liquid jets ejected from a microfluidic device were studied. Thermocavitation bubbles are generated by a continuous wave laser (1064 nm). The 3D chamber was fabricated by ultra-short pulse laser-assisted chemical etching. Penetration tests are conducted using agar gels (1%, 1.25%, 1.5%, 1.75%, and 2% concentrations) and porcine tissue as a model for human skin. Result High-speed camera video analysis showed that the average maximum bubble wall speed is about 10 to 25 m/s for almost any combination of pump laser parameters; however, a clever design of the chamber and nozzle enables one to obtain jets with an average speed of ∼ 70 m / s . The expelled volume per shot (0.1 to 2 μ l ) can be controlled by the pump laser intensity. Our injector can deliver up to 20 shots before chamber refill. Penetration of jets into agar of different concentrations and ex-vivo porcine skin is demonstrated. Conclusions The needle-free injectors based on thermocavitation may hold promise for commercial development, due to their cost and compactness.
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Affiliation(s)
| | - José Manuel Perez-Corte
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Coordinación de Óptica, Puebla, México
| | | | - Samuel Cruz-Vanegas
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Coordinación de Óptica, Puebla, México
| | - Silvio Bonfadini
- Istituto Italiano di Tecnologia, Center for Nano Science and Technology, Milano, Italy
| | - Filippo Storti
- Istituto Italiano di Tecnologia, Center for Nano Science and Technology, Milano, Italy
- Politecnico di Milano, Department of Physics, Milano, Italy
| | - Luigino Criante
- Istituto Italiano di Tecnologia, Center for Nano Science and Technology, Milano, Italy
| | - Rubén Ramos-García
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Coordinación de Óptica, Puebla, México
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8
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Rajendran AK, Sankar D, Amirthalingam S, Kim HD, Rangasamy J, Hwang NS. Trends in mechanobiology guided tissue engineering and tools to study cell-substrate interactions: a brief review. Biomater Res 2023; 27:55. [PMID: 37264479 DOI: 10.1186/s40824-023-00393-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 05/09/2023] [Indexed: 06/03/2023] Open
Abstract
Sensing the mechanical properties of the substrates or the matrix by the cells and the tissues, the subsequent downstream responses at the cellular, nuclear and epigenetic levels and the outcomes are beginning to get unraveled more recently. There have been various instances where researchers have established the underlying connection between the cellular mechanosignalling pathways and cellular physiology, cellular differentiation, and also tissue pathology. It has been now accepted that mechanosignalling, alone or in combination with classical pathways, could play a significant role in fate determination, development, and organization of cells and tissues. Furthermore, as mechanobiology is gaining traction, so do the various techniques to ponder and gain insights into the still unraveled pathways. This review would briefly discuss some of the interesting works wherein it has been shown that specific alteration of the mechanical properties of the substrates would lead to fate determination of stem cells into various differentiated cells such as osteoblasts, adipocytes, tenocytes, cardiomyocytes, and neurons, and how these properties are being utilized for the development of organoids. This review would also cover various techniques that have been developed and employed to explore the effects of mechanosignalling, including imaging of mechanosensing proteins, atomic force microscopy (AFM), quartz crystal microbalance with dissipation measurements (QCMD), traction force microscopy (TFM), microdevice arrays, Spatio-temporal image analysis, optical tweezer force measurements, mechanoscanning ion conductance microscopy (mSICM), acoustofluidic interferometric device (AID) and so forth. This review would provide insights to the researchers who work on exploiting various mechanical properties of substrates to control the cellular and tissue functions for tissue engineering and regenerative applications, and also will shed light on the advancements of various techniques that could be utilized to unravel the unknown in the field of cellular mechanobiology.
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Affiliation(s)
- Arun Kumar Rajendran
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
| | - Deepthi Sankar
- Polymeric Biomaterials Lab, School of Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi, 682041, India
| | - Sivashanmugam Amirthalingam
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea
- Institute of Engineering Research, Seoul National University, Seoul, 08826, Republic of Korea
| | - Hwan D Kim
- Department of Polymer Science and Engineering, Korea National University of Transportation, Chungju, 27469, Republic of Korea
- Department of Biomedical Engineering, Korea National University of Transportation, Chungju, 27469, Republic of Korea
| | - Jayakumar Rangasamy
- Polymeric Biomaterials Lab, School of Nanosciences and Molecular Medicine, Amrita Vishwa Vidyapeetham, Kochi, 682041, India.
| | - Nathaniel S Hwang
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul, 08826, Republic of Korea.
- Institute of Engineering Research, Seoul National University, Seoul, 08826, Republic of Korea.
- Interdisciplinary Program in Bioengineering, Seoul National University, Seoul, 08826, Republic of Korea.
- Bio-MAX/N-Bio Institute, Institute of Bio-Engineering, Seoul National University, Seoul, 08826, Republic of Korea.
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9
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Abdolkarimzadeh F, Ashory MR, Ghasemi-Ghalebahman A, Karimi A. A position- and time-dependent pressure profile to model viscoelastic mechanical behavior of the brain tissue due to tumor growth. Comput Methods Biomech Biomed Engin 2023; 26:660-672. [PMID: 35638726 PMCID: PMC9708950 DOI: 10.1080/10255842.2022.2082245] [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: 02/12/2022] [Revised: 04/06/2022] [Accepted: 05/23/2022] [Indexed: 11/03/2022]
Abstract
This study proposed a computational framework to calculate the resultant position- and time-dependent pressure profile on the brain tissue due to tumor growth. A finite element (FE) patch of the brain tissue was constructed and an inverse dynamic FE-optimization algorithm was used to calculate its viscoelastic mechanical properties under compressive uniaxial loading. Two patient-specific post-tumor resection FE models were input to the FE-optimization algorithm to calculate the optimized 3rd-order position-dependent and normal distribution time-dependent pressure profile parameters. The optimized viscoelastic material properties, the most suitable simulation time, and the optimized 3rd-order position- and -time-dependent pressure profiles were calculated.
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Affiliation(s)
| | | | | | - Alireza Karimi
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham, Birmingham, AL, United States
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10
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A.Alamir HT, Ismaeel GL, Jalil AT, Hadi WH, Jasim IK, Almulla AF, Radhea ZA. Advanced injectable hydrogels for bone tissue regeneration. Biophys Rev 2023; 15:223-237. [PMID: 37124921 PMCID: PMC10133430 DOI: 10.1007/s12551-023-01053-w] [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: 11/07/2022] [Accepted: 03/17/2023] [Indexed: 05/02/2023] Open
Abstract
Diseases or defects of the skeleton are hazardous because of their specificity and intricacy. Bone tissue engineering has become an important area of research that offers promising new tools for making biomimetic hydrogels that can be used to treat bone diseases. New hydrogels with a distinctive 3D network structure, high water content, and functional capabilities are ranked among the most promising candidates for bone tissue engineering. This makes them helpful in treating cartilage injury, skull deformity, and arthritis. This review will briefly introduce the variety of biocompatible functional hydrogels used in cell culture and bone tissue regeneration. Many gel design concepts, such as crosslinking procedures, controlled release properties, and alternative bionic methodology, were stressed regarding injectable hydrogels to form bone tissue. Hydrogels manufactured from biocompatible materials are a promising option for minimally invasive surgery because of their adaptable physicochemical qualities, ability to fill irregularly shaped defect sites, and ability to grow hormones or release drugs in response to external stimuli. Also included in this overview is a quick rundown of the more practical designs employed in treating bone disorders. Essential details on injectable hydrogel scaffolds for bone tissue regeneration are described in this article.
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Affiliation(s)
| | | | - Abduladheem Turki Jalil
- Medical Laboratories Techniques Department, Al-Mustaqbal University College, Hilla, Babylon, 51001 Iraq
| | | | - Ihsan K. Jasim
- Department of Pharmacology, Al-Turath University College, Baghdad, Iraq
| | - Abbas F. Almulla
- Medical Laboratory Technology Department, College of Medical Technology, The Islamic University, Najaf, Iraq
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11
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Klabukov I, Tenchurin T, Shepelev A, Baranovskii D, Mamagulashvili V, Dyuzheva T, Krasilnikova O, Balyasin M, Lyundup A, Krasheninnikov M, Sulina Y, Gomzyak V, Krasheninnikov S, Buzin A, Zayratyants G, Yakimova A, Demchenko A, Ivanov S, Shegay P, Kaprin A, Chvalun S. Biomechanical Behaviors and Degradation Properties of Multilayered Polymer Scaffolds: The Phase Space Method for Bile Duct Design and Bioengineering. Biomedicines 2023; 11:biomedicines11030745. [PMID: 36979723 PMCID: PMC10044742 DOI: 10.3390/biomedicines11030745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 02/21/2023] [Accepted: 02/22/2023] [Indexed: 03/06/2023] Open
Abstract
This article reports the electrospinning technique for the manufacturing of multilayered scaffolds for bile duct tissue engineering based on an inner layer of polycaprolactone (PCL) and an outer layer either of a copolymer of D,L-lactide and glycolide (PLGA) or a copolymer of L-lactide and ε-caprolactone (PLCL). A study of the degradation properties of separate polymers showed that flat PCL samples exhibited the highest resistance to hydrolysis in comparison with PLGA and PLCL. Irrespective of the liquid-phase nature, no significant mass loss of PCL samples was found in 140 days of incubation. The PLCL- and PLGA-based flat samples were more prone to hydrolysis within the same period of time, which was confirmed by the increased loss of mass and a significant reduction of weight-average molecular mass. The study of the mechanical properties of developed multi-layered tubular scaffolds revealed that their strength in the longitudinal and transverse directions was comparable with the values measured for a decellularized bile duct. The strength of three-layered scaffolds declined significantly because of the active degradation of the outer layer made of PLGA. The strength of scaffolds with the PLCL outer layer deteriorated much less with time, both in the axial (p-value = 0.0016) and radial (p-value = 0.0022) directions. A novel method for assessment of the physiological relevance of synthetic scaffolds was developed and named the phase space approach for assessment of physiological relevance. Two-dimensional phase space (elongation modulus and tensile strength) was used for the assessment and visualization of the physiological relevance of scaffolds for bile duct bioengineering. In conclusion, the design of scaffolds for the creation of physiologically relevant tissue-engineered bile ducts should be based not only on biodegradation properties but also on the biomechanical time-related behavior of various compositions of polymers and copolymers.
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Affiliation(s)
- Ilya Klabukov
- Department of Regenerative Medicine, National Medical Research Radiological Centre of the Ministry of Health of the Russian Federation, 249031 Obninsk, Russia
- Department of Urology and Operative Nephrology, Peoples Friendship University of Russia (RUDN University), 117198 Moscow, Russia
- Obninsk Institute for Nuclear Power Engineering, National Research Nuclear University MEPhI, 115409 Obninsk, Russia
- Correspondence:
| | - Timur Tenchurin
- National Research Centre “Kurchatov Institute”, 1, Akademika Kurchatova pl., 123182 Moscow, Russia
| | - Alexey Shepelev
- National Research Centre “Kurchatov Institute”, 1, Akademika Kurchatova pl., 123182 Moscow, Russia
| | - Denis Baranovskii
- Department of Regenerative Medicine, National Medical Research Radiological Centre of the Ministry of Health of the Russian Federation, 249031 Obninsk, Russia
- Department of Urology and Operative Nephrology, Peoples Friendship University of Russia (RUDN University), 117198 Moscow, Russia
| | - Vissarion Mamagulashvili
- National Research Centre “Kurchatov Institute”, 1, Akademika Kurchatova pl., 123182 Moscow, Russia
| | - Tatiana Dyuzheva
- Department of Hospital Surgery, Sklifosovsky Institute of Clinical Medicine, Sechenov First Moscow State Medical University (Sechenov University), 119435 Moscow, Russia
| | - Olga Krasilnikova
- Department of Regenerative Medicine, National Medical Research Radiological Centre of the Ministry of Health of the Russian Federation, 249031 Obninsk, Russia
| | - Maksim Balyasin
- Research and Educational Resource Center for Cellular Technologies, Peoples Friendship University of Russia (RUDN University), 117198 Moscow, Russia
| | - Alexey Lyundup
- Research and Educational Resource Center for Cellular Technologies, Peoples Friendship University of Russia (RUDN University), 117198 Moscow, Russia
- N.P. Bochkov Research Centre for Medical Genetics, 115478 Moscow, Russia
| | - Mikhail Krasheninnikov
- Research and Educational Resource Center for Cellular Technologies, Peoples Friendship University of Russia (RUDN University), 117198 Moscow, Russia
- Lomonosov Institute of Fine Chemical Technologies, Russian Technological University MIREA, 119454 Moscow, Russia
| | - Yana Sulina
- Department of Obstetrics and Gynecology, Sechenov First Moscow State Medical University (Sechenov University), 119435 Moscow, Russia
| | - Vitaly Gomzyak
- National Research Centre “Kurchatov Institute”, 1, Akademika Kurchatova pl., 123182 Moscow, Russia
| | - Sergey Krasheninnikov
- National Research Centre “Kurchatov Institute”, 1, Akademika Kurchatova pl., 123182 Moscow, Russia
| | - Alexander Buzin
- National Research Centre “Kurchatov Institute”, 1, Akademika Kurchatova pl., 123182 Moscow, Russia
- Laboratory of the Structure of Polymer Materials, Enikolopov Institute of Synthetic Polymer Materials RAS, 117393 Moscow, Russia
| | - Georgiy Zayratyants
- Department of Pathology, Moscow State University of Medicine and Dentistry, Delegatskaya st., 20, p. 1, 127473 Moscow, Russia
| | - Anna Yakimova
- Department of Regenerative Medicine, National Medical Research Radiological Centre of the Ministry of Health of the Russian Federation, 249031 Obninsk, Russia
| | - Anna Demchenko
- N.P. Bochkov Research Centre for Medical Genetics, 115478 Moscow, Russia
| | - Sergey Ivanov
- Department of Regenerative Medicine, National Medical Research Radiological Centre of the Ministry of Health of the Russian Federation, 249031 Obninsk, Russia
| | - Peter Shegay
- Department of Regenerative Medicine, National Medical Research Radiological Centre of the Ministry of Health of the Russian Federation, 249031 Obninsk, Russia
- Department of Urology and Operative Nephrology, Peoples Friendship University of Russia (RUDN University), 117198 Moscow, Russia
| | - Andrey Kaprin
- Department of Regenerative Medicine, National Medical Research Radiological Centre of the Ministry of Health of the Russian Federation, 249031 Obninsk, Russia
- Department of Urology and Operative Nephrology, Peoples Friendship University of Russia (RUDN University), 117198 Moscow, Russia
| | - Sergei Chvalun
- National Research Centre “Kurchatov Institute”, 1, Akademika Kurchatova pl., 123182 Moscow, Russia
- Laboratory of the Structure of Polymer Materials, Enikolopov Institute of Synthetic Polymer Materials RAS, 117393 Moscow, Russia
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McCarthy CM, Allardyce JM, Hickey SE, Walsh MT, McGourty KD, Mulvihill JJE. Comparison of macroscale and microscale mechanical properties of fresh and fixed-frozen porcine colonic tissue. J Mech Behav Biomed Mater 2023; 138:105599. [PMID: 36462287 DOI: 10.1016/j.jmbbm.2022.105599] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 11/21/2022] [Accepted: 11/23/2022] [Indexed: 11/27/2022]
Abstract
Mechanical changes to the microenvironment of the extracellular matrix (ECM) in tissue have been hypothesised to elicit a pathogenic response in the surrounding cells. Hence, 3D scaffolds are a popular method of studying cellular behaviour under conditions that mimic in vivo microenvironment. To create a 3D biomimetic scaffold that captures the in vivo ECM microenvironment a robust mechanical characterisation of the whole ECM at the microscale is necessary. This study examined the multiscale methods of characterising the ECM microenvironment using porcine colon tissue. To facilitate fresh tissue microscale mechanical characterisation, a protocol for sectioning fresh, unfixed, soft biological tissue was developed. Four experiments examined both the microscale and macroscale mechanics of both fresh (Fr) and fixed-frozen (FF) porcine colonic tissue using microindentation for microscale testing and uniaxial compression testing for macroscale testing. The results obtained in this study show a significant difference in elastic modulus between Fr and FF tissue at both the macroscale and microscale. There was an order of magnitude difference between the Fr and FF tissue at the microscale between each of the three layers of the colon tested i.e. the muscularis propria (MP), the submucosa (SM) and the mucosa (M). Macroscale testing cannot capture these regional differences. The findings in this study suggest that the most appropriate method for mechanically characterising the ECM is fresh microscale mechanical microindentation. These methods can be used on a range of biological tissues to create 3D biomimetic scaffolds that are more representative of the in vivo ECM, allowing for a more in-depth characterisation of the disease process.
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Affiliation(s)
- Clíona M McCarthy
- Biomaterials Cluster, Bernal Institute, University of Limerick, Limerick, Ireland; School of Engineering, University of Limerick, Limerick, Ireland
| | - Joanna M Allardyce
- School of Allied Health, University of Limerick, Ireland; Health Research Institute, University of Limerick, Ireland
| | - Séamus E Hickey
- Biomaterials Cluster, Bernal Institute, University of Limerick, Limerick, Ireland; School of Chemical Sciences, University of Limerick, Ireland
| | - Michael T Walsh
- Biomaterials Cluster, Bernal Institute, University of Limerick, Limerick, Ireland; School of Engineering, University of Limerick, Limerick, Ireland; Health Research Institute, University of Limerick, Ireland
| | - Kieran D McGourty
- Biomaterials Cluster, Bernal Institute, University of Limerick, Limerick, Ireland; School of Chemical Sciences, University of Limerick, Ireland; Health Research Institute, University of Limerick, Ireland
| | - John J E Mulvihill
- Biomaterials Cluster, Bernal Institute, University of Limerick, Limerick, Ireland; School of Engineering, University of Limerick, Limerick, Ireland; Health Research Institute, University of Limerick, Ireland.
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Morales IA, Boghdady CM, Campbell BE, Moraes C. Integrating mechanical sensor readouts into organ-on-a-chip platforms. Front Bioeng Biotechnol 2022; 10:1060895. [PMID: 36588933 PMCID: PMC9800895 DOI: 10.3389/fbioe.2022.1060895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 12/05/2022] [Indexed: 12/23/2022] Open
Abstract
Organs-on-a-chip have emerged as next-generation tissue engineered models to accurately capture realistic human tissue behaviour, thereby addressing many of the challenges associated with using animal models in research. Mechanical features of the culture environment have emerged as being critically important in designing organs-on-a-chip, as they play important roles in both stimulating realistic tissue formation and function, as well as capturing integrative elements of homeostasis, tissue function, and tissue degeneration in response to external insult and injury. Despite the demonstrated impact of incorporating mechanical cues in these models, strategies to measure these mechanical tissue features in microfluidically-compatible formats directly on-chip are relatively limited. In this review, we first describe general microfluidically-compatible Organs-on-a-chip sensing strategies, and categorize these advances based on the specific advantages of incorporating them on-chip. We then consider foundational and recent advances in mechanical analysis techniques spanning cellular to tissue length scales; and discuss their integration into Organs-on-a-chips for more effective drug screening, disease modeling, and characterization of biological dynamics.
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Affiliation(s)
| | | | | | - Christopher Moraes
- Division of Experimental Medicine, McGill University, Montreal, QC, Canada,Department of Chemical Engineering, McGill University, Montreal, QC, Canada,Department of Biomedical Engineering, McGill University, Montreal, QC, Canada,*Correspondence: Christopher Moraes,
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Karimi A, Razaghi R, Rahmati SM, Downs JC, Acott TS, Kelley MJ, Wang RK, Johnstone M. The Effect of Intraocular Pressure Load Boundary on the Biomechanics of the Human Conventional Aqueous Outflow Pathway. Bioengineering (Basel) 2022; 9:672. [PMID: 36354583 PMCID: PMC9687513 DOI: 10.3390/bioengineering9110672] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 10/28/2022] [Accepted: 11/08/2022] [Indexed: 09/29/2023] Open
Abstract
BACKGROUND Aqueous humor outflow resistance in the trabecular meshwork (TM), juxtacanalicular connective tissue (JCT), and Schlemm's canal (SC) endothelium of the conventional outflow pathway actively contribute to intraocular pressure (IOP) regulation. Outflow resistance is actively affected by the dynamic outflow pressure gradient across the TM, JCT, and SC inner wall tissues. The resistance effect implies the presence of a fluid-structure interaction (FSI) coupling between the outflow tissues and the aqueous humor. However, the biomechanical interactions between viscoelastic outflow tissues and aqueous humor dynamics are largely unknown. METHODS A 3D microstructural finite element (FE) model of a healthy human eye TM/JCT/SC complex was constructed with elastic and viscoelastic material properties for the bulk extracellular matrix and embedded elastic cable elements. The FE models were subjected to both idealized and a physiologic IOP load boundary using the FSI method. RESULTS The elastic material model for both the idealized and physiologic IOP load boundary at equal IOPs showed similar stresses and strains in the outflow tissues as well as pressure in the aqueous humor. However, outflow tissues with viscoelastic material properties were sensitive to the IOP load rate, resulting in different mechanical and hydrodynamic responses in the tissues and aqueous humor. CONCLUSIONS Transient IOP fluctuations may cause a relatively large IOP difference of ~20 mmHg in a very short time frame of ~0.1 s, resulting in a rate stiffening in the outflow tissues. Rate stiffening reduces strains and causes a rate-dependent pressure gradient across the outflow tissues. Thus, the results suggest it is necessary to use a viscoelastic material model in outflow tissues that includes the important role of IOP load rate.
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Affiliation(s)
- Alireza Karimi
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Reza Razaghi
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | | | - J. Crawford Downs
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Ted S. Acott
- Departments of Ophthalmology and Biochemistry and Molecular Biology, Casey Eye Institute, Oregon Health & Science University, Portland, OR 97239, USA
| | - Mary J. Kelley
- Departments of Ophthalmology and Integrative Biosciences, Casey Eye Institute, Oregon Health & Science University, Portland, OR 97239, USA
| | - Ruikang K. Wang
- Department of Ophthalmology, University of Washington, Seattle, WA 98195, USA
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Murray Johnstone
- Department of Ophthalmology, University of Washington, Seattle, WA 98195, USA
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15
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Karimi A, Razaghi R, Padilla S, Rahmati SM, Downs JC, Acott TS, Kelley MJ, Wang RK, Johnstone M. Viscoelastic Biomechanical Properties of the Conventional Aqueous Outflow Pathway Tissues in Healthy and Glaucoma Human Eyes. J Clin Med 2022; 11:6049. [PMID: 36294371 PMCID: PMC9605362 DOI: 10.3390/jcm11206049] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 10/11/2022] [Accepted: 10/12/2022] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Although the tissues comprising the ocular conventional outflow pathway have shown strong viscoelastic mechanical response to aqueous humor pressure dynamics, the viscoelastic mechanical properties of the trabecular meshwork (TM), juxtacanalicular connective tissue (JCT), and Schlemm's canal (SC) inner wall are largely unknown. METHODS A quadrant of the anterior segment from two human donor eyes at low- and high-flow (LF and HF) outflow regions was pressurized and imaged using optical coherence tomography (OCT). A finite element (FE) model of the TM, the adjacent JCT, and the SC inner wall was constructed and viscoelastic beam elements were distributed in the extracellular matrix (ECM) of the TM and JCT to represent anisotropic collagen. An inverse FE-optimization algorithm was used to calculate the viscoelastic properties of the ECM/beam elements such that the TM/JCT/SC model and OCT imaging data best matched over time. RESULTS The ECM of the glaucoma tissues showed significantly larger time-dependent shear moduli compared to the heathy tissues. Significantly larger shear moduli were also observed in the LF regions of both the healthy and glaucoma eyes compared to the HF regions. CONCLUSIONS The outflow tissues in both glaucoma eyes and HF regions are stiffer and less able to respond to dynamic IOP.
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Affiliation(s)
- Alireza Karimi
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Reza Razaghi
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Steven Padilla
- Department of Ophthalmology, University of Washington, Seattle, WA 98109, USA
| | | | - J. Crawford Downs
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Ted S. Acott
- Departments of Ophthalmology and Biochemistry and Molecular Biology, Casey Eye Institute, Oregon Health & Science University, Portland, OR 97239, USA
| | - Mary J. Kelley
- Departments of Ophthalmology and Integrative Biosciences, Casey Eye Institute, Oregon Health & Science University, Portland, OR 97239, USA
| | - Ruikang K. Wang
- Department of Ophthalmology, University of Washington, Seattle, WA 98109, USA
- Department of Bioengineering, University of Washington, Seattle, WA 98105, USA
| | - Murray Johnstone
- Department of Ophthalmology, University of Washington, Seattle, WA 98109, USA
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VandenHeuvel SN, Farris HA, Noltensmeyer DA, Roy S, Donehoo DA, Kopetz S, Haricharan S, Walsh AJ, Raghavan S. Decellularized organ biomatrices facilitate quantifiable in vitro 3D cancer metastasis models. SOFT MATTER 2022; 18:5791-5806. [PMID: 35894795 DOI: 10.1039/d1sm01796a] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Metastatic cancers are chemoresistant, involving complex interplay between disseminated cancer cell aggregates and the distant organ microenvironment (extracellular matrix and stromal cells). Conventional metastasis surrogates (scratch/wound healing, Transwell migration assays) lack 3D architecture and ECM presence. Metastasis studies can therefore significantly benefit from biomimetic 3D in vitro models recapitulating the complex cascade of distant organ invasion and colonization by collective clusters of cells. We aimed to engineer reproducible and quantifiable 3D models of highly therapy-resistant cancer processes: (i) colorectal cancer liver metastasis; and (ii) breast cancer lung metastasis. Metastatic seeds are engineered using 3D tumor spheroids to recapitulate the 3D aggregation of cancer cells both in the tumor and in circulation throughout the metastatic cascade of many cancers. Metastatic soil was engineered by decellularizing porcine livers and lungs to generate biomatrix scaffolds, followed by extensive materials characterization. HCT116 colorectal and MDA-MB-231 breast cancer spheroids were generated on hanging drop arrays to initiate clustered metastatic seeding into liver and lung biomatrix scaffolds, respectively. Between days 3-7, biomatrix cellular colonization was apparent with increased metabolic activity and the presence of cellular nests evaluated via multiphoton microscopy. HCT116 and MDA-MB-231 cells colonized liver and lung biomatrices, and at least 15% of the cells invaded more than 20 μm from the surface. Engineered metastases also expressed increased signatures of genes associated with the metastatic epithelial to mesenchymal transition (EMT). Importantly, inhibition of matrix metalloproteinase-9 inhibited metastatic invasion into the biomatrix. Furthermore, metastatic nests were significantly more chemoresistant (>3 times) to the anti-cancer drug oxaliplatin, compared to 3D spheroids. Together, our data indicated that HCT116 and MDA-MB-231 spheroids invade, colonize, and proliferate in livers and lungs establishing metastatic nests in 3D settings in vitro. The metastatic nature of these cells was confirmed with functional readouts regarding EMT and chemoresistance. Modeling the dynamic metastatic cascade in vitro has potential to identify therapeutic targets to treat or prevent metastatic progression in chemoresistant metastatic cancers.
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Affiliation(s)
| | - Heather A Farris
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA
| | - Dillon A Noltensmeyer
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA
| | - Sanjana Roy
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA
| | - Del A Donehoo
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA
| | - Scott Kopetz
- Department of Gastrointestinal Medical Oncology, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Svasti Haricharan
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA, USA
| | - Alex J Walsh
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA
| | - Shreya Raghavan
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, USA
- Department of Nanomedicine, Houston Methodist Research Institute, Houston, TX, USA.
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Karimi A, Rahmati SM, Razaghi R, Crawford Downs J, Acott TS, Wang RK, Johnstone M. Biomechanics of human trabecular meshwork in healthy and glaucoma eyes via dynamic Schlemm's canal pressurization. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2022; 221:106921. [PMID: 35660943 PMCID: PMC10424782 DOI: 10.1016/j.cmpb.2022.106921] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Revised: 05/17/2022] [Accepted: 05/26/2022] [Indexed: 05/27/2023]
Abstract
BACKGROUND AND OBJECTIVE The trabecular meshwork (TM) consists of extracellular matrix (ECM) with embedded collagen and elastin fibers providing its mechanical support. TM stiffness is considerably higher in glaucoma eyes. Emerging data indicates that the TM moves dynamically with transient intraocular pressure (IOP) fluctuations, implying the viscoelastic mechanical behavior of the TM. However, little is known about TM viscoelastic behavior. We calculated the viscoelastic mechanical properties of the TM in n = 2 healthy and n = 2 glaucoma eyes. METHODS A quadrant of the anterior segment was submerged in a saline bath, and a cannula connected to an adjustable saline reservoir was inserted into Schlemm's canal (SC). A spectral domain-OCT (SD-OCT) provided continuous cross-sectional B-scans of the TM/JCT/SC complex during pressure oscillation from 0 to 30 mmHg at two locations. The TM/JCT/SC complex boundaries were delineated to construct a 20-µm-thick volume finite element (FE) mesh. Pre-tensioned collagen and elastin fibrils were embedded in the model using a mesh-free penalty-based cable-in-solid algorithm. SC pressure was represented by a position- and time-dependent pressure boundary; floating boundary conditions were applied to the other cut edges of the model. An FE-optimization algorithm was used to adjust the ECM/fiber mechanical properties such that the TM/JCT/SC model and SD-OCT imaging data best matched over time. RESULTS Significantly larger short- and long-time ECM shear moduli (p = 0.0032), and collagen (1.82x) and elastin (2.72x) fibril elastic moduli (p = 0.0001), were found in the TM of glaucoma eyes compared to healthy controls. CONCLUSIONS These findings provide additional clarity on the mechanical property differences in healthy and glaucomatous outflow pathway under dynamic loading. Understanding the viscoelastic properties of the TM may serve as a new biomarker in early diagnosis of glaucoma.
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Affiliation(s)
- Alireza Karimi
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham, Birmingham, AL, USA.
| | | | - Reza Razaghi
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham, Birmingham, AL, USA
| | - J Crawford Downs
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham, Birmingham, AL, USA.
| | - Ted S Acott
- Ophthalmology and Biochemistry and Molecular Biology, Casey Eye Institute, Oregon Health & Science University, Portland, Oregon, USA.
| | - Ruikang K Wang
- Department of Ophthalmology, University of Washington, Seattle, WA, USA; Department of Bioengineering, University of Washington, Seattle, WA, USA.
| | - Murray Johnstone
- Department of Ophthalmology, University of Washington, Seattle, WA, USA.
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18
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Karimi A, Razaghi R, Rahmati SM, Downs JC, Acott TS, Wang RK, Johnstone M. Modeling the biomechanics of the conventional aqueous outflow pathway microstructure in the human eye. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2022; 221:106922. [PMID: 35660940 PMCID: PMC10424784 DOI: 10.1016/j.cmpb.2022.106922] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 05/16/2022] [Accepted: 05/26/2022] [Indexed: 05/27/2023]
Abstract
BACKGROUND AND OBJECTIVE Intraocular pressure (IOP) is determined by aqueous humor outflow resistance, which is a function of the combined resistance of Schlemm's canal (SC) endothelium and the trabecular meshwork (TM) and their interactions in the juxtacanalicular connective tissue (JCT) region. Aqueous outflow in the conventional outflow pathway results in pressure gradient across the TM, JCT, and SC inner wall, and induces mechanical stresses and strains that influence the geometry and homeostasis of the outflow system. The outflow resistance is affected by alteration in tissues' geometry, so there is potential for active, two-way, fluid-structure interaction (FSI) coupling between the aqueous humor (fluid) and the TM, JCT, and SC inner wall (structure). However, our understanding of the biomechanical interactions of the aqueous humor with the outflow connective tissues and its contribution to the outflow resistance regulation is incomplete. METHODS In this study, a microstructural finite element (FE) model of a human eye TM, JCT, and SC inner wall was constructed from a segmented, high-resolution histologic 3D reconstruction of the human outflow system. Three different elastic moduli (0.004, 0.128, and 51.5 MPa based on prior reports) were assigned to the TM/JCT complex while the elastic modulus of the SC inner wall was kept constant at 0.00748 MPa. The hydraulic conductivity was programmed separately for the TM, JCT, and SC inner wall using a custom subroutine. Cable elements were embedded into the TM and JCT extracellular matrix to represent the directional stiffness imparted by anisotropic collagen fibril orientation. The resultant stresses and strains in the outflow system were calculated using fluid-structure interaction method. RESULTS The higher TM/JCT stiffness resulted in larger stresses, but smaller strains in the outflow connective tissues, and resulted in a 4- and 5-fold larger pressure drop across the SC inner wall, respectively, compared to the most compliant model. Funneling through µm-sized SC endothelial pores was evident in the models at lower tissue stiffness, but aqueous flow was more turbulent in models with higher TM/JCT stiffness. CONCLUSIONS The mechanical properties of the outflow tissues play a crucial role in the hydrodynamics of the aqueous humor in the conventional outflow system.
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Affiliation(s)
- Alireza Karimi
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham, 1670 University Boulevard, VH 372B, Birmingham, AL 35294, USA.
| | - Reza Razaghi
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham, 1670 University Boulevard, VH 372B, Birmingham, AL 35294, USA
| | | | - J Crawford Downs
- Department of Ophthalmology and Visual Sciences, University of Alabama at Birmingham, 1670 University Boulevard, VH 372B, Birmingham, AL 35294, USA
| | - Ted S Acott
- Ophthalmology and Biochemistry and Molecular Biology, Casey Eye Institute, Oregon Health & Science University, Portland, OR, USA
| | - Ruikang K Wang
- Department of Ophthalmology, University of Washington, Seattle, WA, USA; Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Murray Johnstone
- Department of Ophthalmology, University of Washington, Seattle, WA, USA
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Mur J, Agrež V, Petelin J, Petkovšek R. Microbubble dynamics and jetting near tissue-phantom biointerfaces. BIOMEDICAL OPTICS EXPRESS 2022; 13:1061-1069. [PMID: 35284176 PMCID: PMC8884194 DOI: 10.1364/boe.449814] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 01/20/2022] [Accepted: 01/21/2022] [Indexed: 06/01/2023]
Abstract
Precise excitation of cavitation is a promising mechanism for microsurgery procedures and targeted drug delivery enhancement. The underlying phenomenon of interest, jetting behaviour of oscillating cavitation bubbles, occurs due to near-surface interactions between the boundary, liquid, and bubble. Within this study we measured boundary effects on the cavitation bubble dynamics and morphology, with an emphasis on observation and measurement of jetting behaviour near tissue-phantom biointerfaces. An important mechanism of boundary poration has been observed using time-resolved optical microscopy and explained for different tissue-phantom surface densities and Young's modulus. Below a critical distance to the boundary, around γ = 1.0, the resulting jets penetrated the tissue-phantom, resulting in highly localized few micrometer diameter jets.
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Affiliation(s)
- Jaka Mur
- University of Ljubljana, Faculty of Mechanical Engineering, Aškerčeva 6, SI-1000 Ljubljana, Slovenia
| | - Vid Agrež
- University of Ljubljana, Faculty of Mechanical Engineering, Aškerčeva 6, SI-1000 Ljubljana, Slovenia
| | - Jaka Petelin
- University of Ljubljana, Faculty of Mechanical Engineering, Aškerčeva 6, SI-1000 Ljubljana, Slovenia
| | - Rok Petkovšek
- University of Ljubljana, Faculty of Mechanical Engineering, Aškerčeva 6, SI-1000 Ljubljana, Slovenia
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Kumat SS, Shiakolas PS. Design, inverted vat photopolymerization 3D printing, and initial characterization of a miniature force sensor for localized in vivo tissue measurements. 3D Print Med 2022; 8:1. [PMID: 34982295 PMCID: PMC8725558 DOI: 10.1186/s41205-021-00128-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 11/18/2021] [Indexed: 12/14/2022] Open
Abstract
Background Tissue healthiness could be assessed by evaluating its viscoelastic properties through localized contact reaction force measurements to obtain quantitative time history information. To evaluate these properties for hard to reach and confined areas of the human body, miniature force sensors with size constraints and appropriate load capabilities are needed. This research article reports on the design, fabrication, integration, characterization, and in vivo experimentation of a uniaxial miniature force sensor on a human forearm. Methods The strain gauge based sensor components were designed to meet dimensional constraints (diameter ≤3.5mm), safety factor (≥3) and performance specifications (maximum applied load, resolution, sensitivity, and accuracy). The sensing element was fabricated using traditional machining. Inverted vat photopolymerization technology was used to prototype complex components on a Form3 printer; micro-component orientation for fabrication challenges were overcome through experimentation. The sensor performance was characterized using dead weights and a LabVIEW based custom developed data acquisition system. The operational performance was evaluated by in vivo measurements on a human forearm; the relaxation data were used to calculate the Voigt model viscoelastic coefficient. Results The three dimensional (3D) printed components exhibited good dimensional accuracy (maximum deviation of 183μm). The assembled sensor exhibited linear behavior (regression coefficient of R2=0.999) and met desired performance specifications of 3.4 safety factor, 1.2N load capacity, 18mN resolution, and 3.13% accuracy. The in vivo experimentally obtained relaxation data were analyzed using the Voigt model yielding a viscoelastic coefficient τ=12.38sec and a curve-fit regression coefficient of R2=0.992. Conclusions This research presented the successful design, use of 3D printing for component fabrication, integration, characterization, and analysis of initial in vivo collected measurements with excellent performance for a miniature force sensor for the assessment of tissue viscoelastic properties. Through this research certain limitations were identified, however the initial sensor performance was promising and encouraging to continue the work to improve the sensor. This micro-force sensor could be used to obtain tissue quantitative data to assess tissue healthiness for medical care over extended time periods.
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Affiliation(s)
- Shashank S Kumat
- Mechanical and Aerospace Engineering Department, The University of Texas at Arlington, S Nedderman Dr, Arlington, 76019, TX, USA
| | - Panos S Shiakolas
- Mechanical and Aerospace Engineering Department, The University of Texas at Arlington, S Nedderman Dr, Arlington, 76019, TX, USA.
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21
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Cao H, Duan L, Zhang Y, Cao J, Zhang K. Current hydrogel advances in physicochemical and biological response-driven biomedical application diversity. Signal Transduct Target Ther 2021; 6:426. [PMID: 34916490 PMCID: PMC8674418 DOI: 10.1038/s41392-021-00830-x] [Citation(s) in RCA: 258] [Impact Index Per Article: 86.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 11/10/2021] [Accepted: 11/11/2021] [Indexed: 02/05/2023] Open
Abstract
Hydrogel is a type of versatile platform with various biomedical applications after rational structure and functional design that leverages on material engineering to modulate its physicochemical properties (e.g., stiffness, pore size, viscoelasticity, microarchitecture, degradability, ligand presentation, stimulus-responsive properties, etc.) and influence cell signaling cascades and fate. In the past few decades, a plethora of pioneering studies have been implemented to explore the cell-hydrogel matrix interactions and figure out the underlying mechanisms, paving the way to the lab-to-clinic translation of hydrogel-based therapies. In this review, we first introduced the physicochemical properties of hydrogels and their fabrication approaches concisely. Subsequently, the comprehensive description and deep discussion were elucidated, wherein the influences of different hydrogels properties on cell behaviors and cellular signaling events were highlighted. These behaviors or events included integrin clustering, focal adhesion (FA) complex accumulation and activation, cytoskeleton rearrangement, protein cyto-nuclei shuttling and activation (e.g., Yes-associated protein (YAP), catenin, etc.), cellular compartment reorganization, gene expression, and further cell biology modulation (e.g., spreading, migration, proliferation, lineage commitment, etc.). Based on them, current in vitro and in vivo hydrogel applications that mainly covered diseases models, various cell delivery protocols for tissue regeneration and disease therapy, smart drug carrier, bioimaging, biosensor, and conductive wearable/implantable biodevices, etc. were further summarized and discussed. More significantly, the clinical translation potential and trials of hydrogels were presented, accompanied with which the remaining challenges and future perspectives in this field were emphasized. Collectively, the comprehensive and deep insights in this review will shed light on the design principles of new biomedical hydrogels to understand and modulate cellular processes, which are available for providing significant indications for future hydrogel design and serving for a broad range of biomedical applications.
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Affiliation(s)
- Huan Cao
- Department of Nuclear Medicine, West China Hospital, and National Engineering Research Center for Biomaterials, Sichuan University, 610064, Chengdu, P. R. China
- Department of Medical Ultrasound and Central Laboratory, Shanghai Tenth People's Hospital, Tongji University School of Medicine, No. 301 Yan-chang-zhong Road, 200072, Shanghai, People's Republic of China
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Lixia Duan
- Department of Medical Ultrasound and Central Laboratory, Shanghai Tenth People's Hospital, Tongji University School of Medicine, No. 301 Yan-chang-zhong Road, 200072, Shanghai, People's Republic of China
| | - Yan Zhang
- Department of Medical Ultrasound and Central Laboratory, Shanghai Tenth People's Hospital, Tongji University School of Medicine, No. 301 Yan-chang-zhong Road, 200072, Shanghai, People's Republic of China
| | - Jun Cao
- Department of Nuclear Medicine, West China Hospital, and National Engineering Research Center for Biomaterials, Sichuan University, 610064, Chengdu, P. R. China.
| | - Kun Zhang
- Department of Medical Ultrasound and Central Laboratory, Shanghai Tenth People's Hospital, Tongji University School of Medicine, No. 301 Yan-chang-zhong Road, 200072, Shanghai, People's Republic of China.
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22
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Softening Effects in Biological Tissues and NiTi Knitwear during Cyclic Loading. MATERIALS 2021; 14:ma14216256. [PMID: 34771782 PMCID: PMC8585136 DOI: 10.3390/ma14216256] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 10/08/2021] [Accepted: 10/12/2021] [Indexed: 11/23/2022]
Abstract
Samples of skin, tendons, muscles, and knitwear composed of NiTi wire are studied by uniaxial cyclic tension and stretching to rupture. The metal knitted mesh behaves similar to a superelastic material when stretched, similar to soft biological tissues. The superelasticity effect was found in NiTi wire, but not in the mesh composed of it. A softening effect similar to biological tissues is observed during the cyclic stretching of the mesh. The mechanical behavior of the NiTi mesh is similar to the biomechanical behavior of biological tissues. The discovered superelastic effects allow developing criteria for the selection and evaluation of mesh materials composed of titanium nickelide for soft tissue reconstructive surgery.
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Tayler IM, Stowers RS. Engineering hydrogels for personalized disease modeling and regenerative medicine. Acta Biomater 2021; 132:4-22. [PMID: 33882354 DOI: 10.1016/j.actbio.2021.04.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Revised: 03/26/2021] [Accepted: 04/12/2021] [Indexed: 02/06/2023]
Abstract
Technological innovations and advances in scientific understanding have created an environment where data can be collected, analyzed, and interpreted at scale, ushering in the era of personalized medicine. The ability to isolate cells from individual patients offers tremendous promise if those cells can be used to generate functional tissue replacements or used in disease modeling to determine optimal treatment strategies. Here, we review recent progress in the use of hydrogels to create artificial cellular microenvironments for personalized tissue engineering and regenerative medicine applications, as well as to develop personalized disease models. We highlight engineering strategies to control stem cell fate through hydrogel design, and the use of hydrogels in combination with organoids, advanced imaging methods, and novel bioprinting techniques to generate functional tissues. We also discuss the use of hydrogels to study molecular mechanisms underlying diseases and to create personalized in vitro disease models to complement existing pre-clinical models. Continued progress in the development of engineered hydrogels, in combination with other emerging technologies, will be essential to realize the immense potential of personalized medicine. STATEMENT OF SIGNIFICANCE: In this review, we cover recent advances in hydrogel engineering strategies with applications in personalized medicine. Specifically, we focus on material systems to expand or control differentiation of patient-derived stem cells, and hydrogels to reprogram somatic cells to pluripotent states. We then review applications of hydrogels in developing personalized engineered tissues. We also highlight the use of hydrogel systems as personalized disease models, focusing on specific examples in fibrosis and cancer, and more broadly on drug screening strategies using patient-derived cells and hydrogels. We believe this review will be a valuable contribution to the Special Issue and the readership of Acta Biomaterialia will appreciate the comprehensive overview of the utility of hydrogels in the developing field of personalized medicine.
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24
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Al-Mutairi FF, Chung EM, Moran CM, Ramnarine KV. A Novel Elastography Phantom Prototype for Assessment of Ultrasound Elastography Imaging Performance. ULTRASOUND IN MEDICINE & BIOLOGY 2021; 47:2749-2758. [PMID: 34144833 DOI: 10.1016/j.ultrasmedbio.2021.05.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 05/08/2021] [Accepted: 05/17/2021] [Indexed: 06/12/2023]
Abstract
The aims of this study were firstly to manufacture and evaluate a novel elastography test phantom and secondly to assess the performance of an elastography system using this phantom. A novel Leicester-St. Thomas' Elastography Pipe (L-STEP) test phantom consisting of five soft polyvinyl acrylic-cryogel pipes of varying diameters (2-12 mm), embedded at 45° within an agar-based tissue-mimicking material was developed. A shear-wave elastography (SWE) scanner was used by two blinded operators to image and assess longitudinal sections of the pipes. Young's modulus estimates were dependent on the diameter of pipes and at superficial depths were greater than deeper depths (mean 98 kPa vs. 59 kPa) and had lower coefficients of variation (mean 21% vs. 53%). The penetration depth (maximum depth at which a SWE signal was obtained) increased with increasing pipe diameter. Penetration depth measurements had excellent inter- and intra-operator reproducibility (intra-class correlation coefficients >0.8) and coefficient of variation range of 2%-12%. A new metric, called the summative performance index, was defined as the sum of the ratios of the penetration depth/pipe diameter. The L-STEP phantom is suitable for assessing key aspects of elastography imaging performance: resolution, accuracy, reproducibility, depth dependence, sensitivity and our novel summative performance index.
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Affiliation(s)
- Fahad F Al-Mutairi
- Department of Diagnostic Radiology, Faculty of Applied Medical Sciences, King Abdulaziz University (KAU), Jeddah, Saudi Arabia; Department of Cardiovascular Sciences, University of Leicester, Leicester, United Kingdom
| | - Emma Ml Chung
- Department of Cardiovascular Sciences, University of Leicester, Leicester, United Kingdom; National Institute for Health Research (NIHR) Leicester Biomedical Research Centre, Glenfield Hospital, Leicester, United Kingdom; Department of Medical Physics, University Hospitals of Leicester NHS Trust, Leicester, United Kingdom
| | - Carmel M Moran
- Centre for Cardiovascular Science, University of Edinburgh, Edinburgh, United Kingdom
| | - Kumar V Ramnarine
- Department of Cardiovascular Sciences, University of Leicester, Leicester, United Kingdom; Medical Physics Department, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom.
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25
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Dharma IA, Kawashima D, Baidillah MR, Darma PN, Takei M. In-vivoviscoelastic properties estimation in subcutaneous adipose tissue by integration of poroviscoelastic-mass transport model (pve-MTM) into wearable electrical impedance tomography (w-EIT). Biomed Phys Eng Express 2021; 7. [PMID: 33887715 DOI: 10.1088/2057-1976/abfaea] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2021] [Accepted: 04/22/2021] [Indexed: 11/11/2022]
Abstract
In-vivoviscoelastic properties have been estimated in human subcutaneous adipose tissue (SAT) by integration of poroviscoelastic-mass transport model (pve-MTM) into wearable electrical impedance tomography (w-EIT) under the influence of external compressive pressure-P.Thepve-MTM predicts the ion concentration distributioncmod(t)by coupling the poroviscoelastic and mass transport model to describe the hydrodynamics, rheology, and transport phenomena inside SAT. Thew-EIT measures the time-difference conductivity distribution∆γ(t)in SAT resulted from the ion transport. Based on the integration, the two viscoelastic properties which are viscoelastic shear modulus of SATGvand relaxation time of SATτvare estimated by applying an iterative curve-fitting between the normalized average ion concentration distributioncˆmod(t)predicted frompve-MTM and the experimental normalized average ion concentration distributioncˆexp(t)derived fromw-EIT. Thein-vivoexperiments were conducted by applying external compressive pressure-Pon human calf boundary to induce interstitial fluid flow and ion movement in SAT. As a result, the value ofGvwas range from 4.9-6.3 kPa and the value ofτvwas range from 27.50-38.5 s with the value of average goodness-of-fit curve fittingR2 > 0.76. These values ofGvandτvwere compared to the human and animal tissue from the literature in order to verify this method. The results frompve-MTM provide evidence thatGvandτvplay a role in the predicted value ofcˆmod.
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Affiliation(s)
- Irfan Aditya Dharma
- Department of Mechanical Engineering, Graduate School of Science and Engineering, Chiba University, 1-33, Yayoicho, Inage-ku, Chiba-shi, Chiba 263-8522, Japan.,Department of Mechanical Engineering, Faculty of Industrial Technology, Universitas Islam Indonesia, Jalan Kaliurang KM. 14,5, Sleman, D.I.Yogyakarta 55584, Indonesia
| | - Daisuke Kawashima
- Department of Mechanical Engineering, Graduate School of Science and Engineering, Chiba University, 1-33, Yayoicho, Inage-ku, Chiba-shi, Chiba 263-8522, Japan
| | - Marlin Ramadhan Baidillah
- Department of Mechanical Engineering, Graduate School of Science and Engineering, Chiba University, 1-33, Yayoicho, Inage-ku, Chiba-shi, Chiba 263-8522, Japan
| | - Panji Nursetia Darma
- Department of Mechanical Engineering, Graduate School of Science and Engineering, Chiba University, 1-33, Yayoicho, Inage-ku, Chiba-shi, Chiba 263-8522, Japan
| | - Masahiro Takei
- Department of Mechanical Engineering, Graduate School of Science and Engineering, Chiba University, 1-33, Yayoicho, Inage-ku, Chiba-shi, Chiba 263-8522, Japan
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26
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Zampini MA, Guidetti M, Royston TJ, Klatt D. Measuring viscoelastic parameters in Magnetic Resonance Elastography: a comparison at high and low magnetic field intensity. J Mech Behav Biomed Mater 2021; 120:104587. [PMID: 34034077 DOI: 10.1016/j.jmbbm.2021.104587] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 04/21/2021] [Accepted: 05/08/2021] [Indexed: 12/21/2022]
Abstract
Magnetic Resonance Elastography (MRE) is a non-invasive imaging technique which involves motion-encoding MRI for the estimation of the shear viscoelastic properties of soft tissues through the study of shear wave propagation. The technique has been found informative for disease diagnosis, as well as for monitoring of the effects of therapies. The development of MRE and its validation have been supported by the use of tissue-mimicking phantoms. In this paper we present our new MRE protocol using a low magnetic field tabletop MRI device at 0.5 T and sinusoidal uniaxial excitation in a geometrical focusing condition. Results obtained for gelatin are compared to those previously obtained using high magnetic field MRE at 11.7 T. A multi-frequency investigation is also provided via a comparison of commonly used rheological models: Maxwell, Springpot, Voigt, Zener, Jeffrey, fractional Voigt and fractional Zener. Complex shear modulus values were comparable when processed from images acquired with the tabletop low field scanner and the high field scanner. This study serves as a validation of the presented tabletop MRE protocol and paves the way for MRE experiments on ex-vivo tissue samples in both normal and pathological conditions.
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Affiliation(s)
- Marco Andrea Zampini
- University of Illinois at Chicago, Department of Bioengineering, University of Illinois at Chicago, Chicago, IL, 60607, USA; MR Solutions Ltd, Ashbourne House, Old Portsmouth Rd, Guildford, United Kingdom; Bio-Imaging Lab, Department of Biomedical Sciences, University of Antwerp, Universiteitsplein 1, Wilrijk, Belgium.
| | - Martina Guidetti
- University of Illinois at Chicago, Department of Bioengineering, University of Illinois at Chicago, Chicago, IL, 60607, USA
| | - Thomas J Royston
- University of Illinois at Chicago, Department of Bioengineering, University of Illinois at Chicago, Chicago, IL, 60607, USA
| | - Dieter Klatt
- University of Illinois at Chicago, Department of Bioengineering, University of Illinois at Chicago, Chicago, IL, 60607, USA
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27
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Bogunovic N, Meekel JP, Majolée J, Hekhuis M, Pyszkowski J, Jockenhövel S, Kruse M, Riesebos E, Micha D, Blankensteijn JD, Hordijk PL, Ghazanfari S, Yeung KK. Patient-Specific 3-Dimensional Model of Smooth Muscle Cell and Extracellular Matrix Dysfunction for the Study of Aortic Aneurysms. J Endovasc Ther 2021; 28:604-613. [PMID: 33902345 PMCID: PMC8276336 DOI: 10.1177/15266028211009272] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
INTRODUCTION Abdominal aortic aneurysms (AAAs) are associated with overall high mortality in case of rupture. Since the pathophysiology is unclear, no adequate pharmacological therapy exists. Smooth muscle cells (SMCs) dysfunction and extracellular matrix (ECM) degradation have been proposed as underlying causes. We investigated SMC spatial organization and SMC-ECM interactions in our novel 3-dimensional (3D) vascular model. We validated our model for future use by comparing it to existing 2-dimensional (2D) cell culture. Our model can be used for translational studies of SMC and their role in AAA pathophysiology. MATERIALS AND METHODS SMC isolated from the medial layer of were the aortic wall of controls and AAA patients seeded on electrospun poly-lactide-co-glycolide scaffolds and cultured for 5 weeks, after which endothelial cells (EC) are added. Cell morphology, orientation, mechanical properties and ECM production were quantified for validation and comparison between controls and patients. RESULTS We show that cultured SMC proliferate into multiple layers after 5 weeks in culture and produce ECM proteins, mimicking their behavior in the medial aortic layer. EC attach to multilayered SMC, mimicking layer interactions. The novel SMC model exhibits viscoelastic properties comparable to biological vessels; cytoskeletal organization increases during the 5 weeks in culture; increased cytoskeletal alignment and decreased ECM production indicate different organization of AAA patients' cells compared with control. CONCLUSION We present a valuable preclinical model of AAA constructed with patient specific cells with applications in both translational research and therapeutic developments. We observed SMC spatial reorganization in a time course of 5 weeks in our robust, patient-specific model of SMC-EC organization and ECM production.
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Affiliation(s)
- Natalija Bogunovic
- Amsterdam Cardiovascular Sciences, Department of Vascular Surgery, Amsterdam University Medical Centers, Location VUmc, Amsterdam, The Netherlands.,Amsterdam Cardiovascular Sciences, Department of Physiology, Amsterdam University Medical Centers, Location VUmc, Amsterdam, The Netherlands.,Amsterdam Cardiovascular Sciences, Department of Clinical Genetics, Amsterdam University Medical Centers, Location VUmc, Amsterdam, The Netherlands
| | - Jorn P Meekel
- Amsterdam Cardiovascular Sciences, Department of Vascular Surgery, Amsterdam University Medical Centers, Location VUmc, Amsterdam, The Netherlands.,Amsterdam Cardiovascular Sciences, Department of Physiology, Amsterdam University Medical Centers, Location VUmc, Amsterdam, The Netherlands
| | - Jisca Majolée
- Amsterdam Cardiovascular Sciences, Department of Physiology, Amsterdam University Medical Centers, Location VUmc, Amsterdam, The Netherlands
| | - Marije Hekhuis
- Amsterdam Cardiovascular Sciences, Department of Clinical Genetics, Amsterdam University Medical Centers, Location VUmc, Amsterdam, The Netherlands
| | | | - Stefan Jockenhövel
- Aachen-Maastricht Institute for Biobased Materials, Faculty of Science and Engineering, Maastricht University, Geleen, The Netherlands.,Department of Biohybrid & Medical Textiles (Biotex), RWTH Aachen University, Aachen, Germany
| | - Magnus Kruse
- Department of Biohybrid & Medical Textiles (Biotex), RWTH Aachen University, Aachen, Germany.,Institut für Textiltechnik der RWTH Aachen University, Aachen, Germany
| | - Elise Riesebos
- Amsterdam Cardiovascular Sciences, Department of Clinical Genetics, Amsterdam University Medical Centers, Location VUmc, Amsterdam, The Netherlands
| | - Dimitra Micha
- Amsterdam Cardiovascular Sciences, Department of Clinical Genetics, Amsterdam University Medical Centers, Location VUmc, Amsterdam, The Netherlands
| | - Jan D Blankensteijn
- Amsterdam Cardiovascular Sciences, Department of Vascular Surgery, Amsterdam University Medical Centers, Location VUmc, Amsterdam, The Netherlands
| | - Peter L Hordijk
- Amsterdam Cardiovascular Sciences, Department of Physiology, Amsterdam University Medical Centers, Location VUmc, Amsterdam, The Netherlands
| | - Samaneh Ghazanfari
- Aachen-Maastricht Institute for Biobased Materials, Faculty of Science and Engineering, Maastricht University, Geleen, The Netherlands.,Department of Biohybrid & Medical Textiles (Biotex), RWTH Aachen University, Aachen, Germany
| | - Kak K Yeung
- Amsterdam Cardiovascular Sciences, Department of Vascular Surgery, Amsterdam University Medical Centers, Location VUmc, Amsterdam, The Netherlands.,Amsterdam Cardiovascular Sciences, Department of Physiology, Amsterdam University Medical Centers, Location VUmc, Amsterdam, The Netherlands
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28
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Tosoratti E, Incaviglia I, Liashenko O, Leinenbach C, Zenobi-Wong M. Additively Manufactured Semiflexible Titanium Lattices as Hydrogel Reinforcement for Biomedical Implants. ADVANCED NANOBIOMED RESEARCH 2021. [DOI: 10.1002/anbr.202000031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
- Enrico Tosoratti
- Institute for Biomechanics ETH Zurich Otto-Stern-Weg 7 Zurich 8093 Switzerland
| | - Ilaria Incaviglia
- Advanced Materials and Surfaces Swiss Federal Laboratories for Materials Science and Technology Überland Str. 129 Dübendorf 8600 Switzerland
| | - Oleksii Liashenko
- Advanced Materials and Surfaces Swiss Federal Laboratories for Materials Science and Technology Überland Str. 129 Dübendorf 8600 Switzerland
| | - Christian Leinenbach
- Advanced Materials and Surfaces Swiss Federal Laboratories for Materials Science and Technology Überland Str. 129 Dübendorf 8600 Switzerland
| | - Marcy Zenobi-Wong
- Institute for Biomechanics ETH Zurich Otto-Stern-Weg 7 Zurich 8093 Switzerland
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29
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Islam MR, Virag J, Oyen ML. Micromechanical poroelastic and viscoelastic properties of ex-vivo soft tissues. J Biomech 2020; 113:110090. [PMID: 33176223 DOI: 10.1016/j.jbiomech.2020.110090] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 10/01/2020] [Accepted: 10/16/2020] [Indexed: 11/16/2022]
Abstract
Soft biological tissues demonstrate strong time-dependent mechanical behavior, arising from their intrinsic viscoelasticity and fluid flow-induced poroelasticity. It is increasingly recognized that time-dependent mechanical properties of soft tissues influence their physiological functions and are linked to several pathological processes. Nevertheless, soft tissue time-dependent characteristics, especially their micromechanical variation with tissue composition and location, remain poorly understood. Nanoindentation is a well-established technique to measure local elastic properties but has not been fully explored to determine micro-scale time-dependent properties of soft tissues. Here, a nanoindentation-based experimental strategy is implemented to characterize the micro-scale poroelastic and viscoelastic behavior of mouse heart, kidney, and liver tissues. It is demonstrated that heart tissue exhibits substantial mechanical heterogeneity where the elastic modulus varies spatially from 1 to 30 kPa. In contrast, both kidney and liver tissues show relatively homogeneous response with elastic modulus 0.5-3 kPa. All three tissues demonstrate marked load relaxation under constant indentation, where the relaxation behavior is observed to be largely dominated by tissue viscoelasticity. Intrinsic permeability varies among different tissues, where heart tissue is found to be less permeable compared to kidney and liver tissues. Overall, the results presented herein provide key insights into the time-dependent micromechanical behavior of different tissues and can therefore contribute to studies of tissue pathology and tissue engineering applications.
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Affiliation(s)
- Mohammad R Islam
- Department of Engineering, East Carolina University, Greenville, NC 27834, United States
| | - Jitka Virag
- Department of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC 27834, United States
| | - Michelle L Oyen
- Department of Engineering, East Carolina University, Greenville, NC 27834, United States.
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30
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Linzenbold W, Jäger L, Stoll H, Abruzzese T, Harland N, Bézière N, Fech A, Enderle M, Amend B, Stenzl A, Aicher WK. Rapid and precise delivery of cells in the urethral sphincter complex by a novel needle-free waterjet technology. BJU Int 2020; 127:463-472. [PMID: 32940408 DOI: 10.1111/bju.15249] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
OBJECTIVES To investigate the therapy of stress urinary incontinence in a preclinical setting cells were injected into the urethrae of minipigs; however, cells injected by William's needle were frequently misplaced or lost; thus, we investigated if needle-free cell injections using a novel waterjet technology facilitates precise injections in the urethral sphincter complex. MATERIALS AND METHODS Porcine adipose tissue-derived stromal cells (pADSCs) were isolated from boars, expanded, labelled, and injected in the sphincter of female pigs by waterjet employing two different protocols. After incubation for 15 min or 3 days, the urethrae of the pigs were examined. Injected cells were visualised by imaging and fluorescence microscopy of tissue sections. DNA of injected male cells was verified by polymerase chain reaction (PCR) of the sex-determining region (SRY) gene. Cell injections by William's needle served as controls. RESULTS The new waterjet technology delivered pADSCs faster and with better on-site precision than the needle injections. Bleeding during or after waterjet injection or other adverse effects, such as swelling or urinary retention, were not observed. Morphologically intact pADSCs were detected in the urethrae of all pigs treated by waterjet. SRY-PCR of chromosomal DNA and detection of recombinant green fluorescent protein verified the injection of viable cells. In contrast, three of four pigs injected by William's needle displayed no or misplaced cells. CONCLUSION Transurethral injection of viable pADSCs by waterjet is a simple, fast, precise, and yet gentle new technology. This is the first proof-of-principle concept study providing evidence that a waterjet injects intact cells exactly in the tissue targeted in a preclinical in vivo situation. To further explore the clinical potential of the waterjet technology longer follow-up, as well as incontinence models have to be studied.
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Affiliation(s)
| | | | - Hartmut Stoll
- Department of Urology, University of Tübingen Hospital, Tübingen, Germany
| | - Tanja Abruzzese
- Department of Urology, University of Tübingen Hospital, Tübingen, Germany
| | - Niklas Harland
- Department of Urology, University of Tübingen Hospital, Tübingen, Germany
| | - Nicolas Bézière
- Department of Preclinical Imaging and Radiopharmacy, Werner Siemens Imaging Center, Eberhard Karls University Tübingen, Tübingen, Germany
| | | | | | - Bastian Amend
- Department of Urology, University of Tübingen Hospital, Tübingen, Germany
| | - Arnulf Stenzl
- Department of Urology, University of Tübingen Hospital, Tübingen, Germany
| | - Wilhelm K Aicher
- Department of Urology, University of Tübingen Hospital, Tübingen, Germany
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31
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Uzuner S, Li L, Kucuk S, Memisoglu K. Changes in Knee Joint Mechanics After Medial Meniscectomy Determined With a Poromechanical Model. J Biomech Eng 2020; 142:101006. [PMID: 32451526 DOI: 10.1115/1.4047343] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Indexed: 11/08/2022]
Abstract
The menisci play a vital role in the mechanical function of knee joint. Unfortunately, meniscal tears often occur. Meniscectomy is a surgical treatment for meniscal tears; however, mechanical changes in the knee joint after meniscectomy is a risk factor to osteoarthritis (OA). The objective of this study was to investigate the altered cartilage mechanics of different medial meniscectomies using a poromechanical model of the knee joint. The cartilaginous tissues were modeled as nonlinear fibril-reinforced porous materials with full saturation. The ligaments were considered as anisotropic hyperelastic and reinforced by a fibrillar collagen network. A compressive creep load of ¾ body weight was applied in full extension of the right knee during 200 s standing. Four finite element models were developed to simulate different meniscectomies of the joint using the intact model as the reference for comparison. The modeling results showed a higher load support in the lateral than medial compartment in the intact joint, and the difference in the load share between the compartments was augmented with medial meniscectomy. Similarly, the contact and fluid pressures were higher in the lateral compartment. On the other hand, the medial meniscus in the normal joint experienced more loading than the lateral one. Furthermore, the contact pressure distribution changed with creep, resulting in a load transfer between cartilage and meniscus within each compartment while the total load born by the compartment remained unchanged. This study has quantified the altered contact mechanics on the type and size of meniscectomies, which may be used to understand meniscal tear or support surgical decisions.
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Affiliation(s)
- Sabri Uzuner
- Department of Mechatronics, Dr. Engin PAK Cumayeri Vocational School, University of Duzce, Cumayeri, Duzce, Marmara 81700, Turkey
| | - LePing Li
- Department of Mechanical and Manufacturing Engineering, University of Calgary, 2500 University Drive, N.W., Calgary, AB T2N 1N4, Canada
| | - Serdar Kucuk
- Department of Biomedical Engineering, University of Kocaeli, Izmit, Kocaeli, Marmara 41001, Turkey
| | - Kaya Memisoglu
- Medical Faculty, Department of Orthopedics and Traumatology, University of Kocaeli, Izmit, Kocaeli, Marmara 41001, Turkey
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32
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Nafo W, Al-Mayah A. Mechanical characterization of PVA hydrogels' rate-dependent response using multi-axial loading. PLoS One 2020; 15:e0233021. [PMID: 32396571 PMCID: PMC7217472 DOI: 10.1371/journal.pone.0233021] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 04/27/2020] [Indexed: 11/18/2022] Open
Abstract
The time-dependent properties of rubber-like synthesized and biological materials are crucial for their applications. Currently, this behavior is mainly measured using axial tensile test, compression test, or indentation. Limited studies performed on using multi-axial loading measurements of time-dependent material behavior exist in the literature. Therefore, the aim of this study is to investigate the viscoelastic response of rubber-like materials under multi-axial loading using cavity expansion and relaxation tests. The tests were performed on PVA hydrogel specimens. Three hyperelasitc models and one term Prony series were used to characterize the viscoelastic response of the hydrogels. Finite element (FE) simulations were performed to verify the validity of the calibrated material coefficients by reproducing the experimental results. The excellent agreement between the experimental, analytical and numerical data proves the capability of the cavity expansion technique to measure the time-dependent behavior of viscoelastic materials.
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Affiliation(s)
- Wanis Nafo
- Civil and Environmental Engineering Department, University of Waterloo, Waterloo, Ontario, Canada
| | - Adil Al-Mayah
- Civil and Environmental Engineering Department, University of Waterloo, Waterloo, Ontario, Canada
- Mechanical and Mechatronics Engineering Department, University of Waterloo, Waterloo, Ontario, Canada
- Centre for Bioengineering and Biotechnology, University of Waterloo, Waterloo, Ontario, Canada
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33
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Yasenchuk Y, Marchenko E, Gunther V, Radkevich A, Kokorev O, Gunther S, Baigonakova G, Hodorenko V, Chekalkin T, Kang JH, Weiss S, Obrosov A. Biocompatibility and Clinical Application of Porous TiNi Alloys Made by Self-Propagating High-Temperature Synthesis (SHS). MATERIALS (BASEL, SWITZERLAND) 2019; 12:E2405. [PMID: 31357702 PMCID: PMC6696327 DOI: 10.3390/ma12152405] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 07/23/2019] [Accepted: 07/26/2019] [Indexed: 11/16/2022]
Abstract
Porous TiNi alloys fabricated by self-propagating high-temperature synthesis (SHS) are biomaterials designed for medical application in substituting tissue lesions and they were clinically deployed more than 30 years ago. The SHS process, as a very fast and economically justified route of powder metallurgy, has distinctive features which impart special attributes to the resultant implant, facilitating its integration in terms of bio-mechanical/chemical compatibility. On the phenomenological level, the fact of high biocompatibility of porous SHS TiNi (PTN) material in vivo has been recognized and is not in dispute presently, but the rationale is somewhat disputable. The features of the SHS TiNi process led to a multifarious intermetallic Ti4Ni2(O,N,C)-based constituents in the amorphous-nanocrystalline superficial layer which entirely conceals the matrix and enhances the corrosion resistance of the unwrought alloy. In the current article, we briefly explore issues of the high biocompatibility level on which additional studies could be carried out, as well as recent progress and key fields of clinical application, yet allowing innovative solutions.
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Affiliation(s)
- Yuri Yasenchuk
- Research Institute of Medical Materials, Tomsk State University, Tomsk 634045, Russia
| | - Ekaterina Marchenko
- Research Institute of Medical Materials, Tomsk State University, Tomsk 634045, Russia
| | - Victor Gunther
- Research Institute of Medical Materials, Tomsk State University, Tomsk 634045, Russia
| | - Andrey Radkevich
- Research Institute of Medical Problems of the North, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660017, Russia
| | - Oleg Kokorev
- Research Institute of Medical Materials, Tomsk State University, Tomsk 634045, Russia
| | - Sergey Gunther
- Research Institute of Medical Materials, Tomsk State University, Tomsk 634045, Russia
| | - Gulsharat Baigonakova
- Research Institute of Medical Materials, Tomsk State University, Tomsk 634045, Russia
| | - Valentina Hodorenko
- Research Institute of Medical Materials, Tomsk State University, Tomsk 634045, Russia
| | - Timofey Chekalkin
- Research Institute of Medical Materials, Tomsk State University, Tomsk 634045, Russia.
- Kang and Park Medical Co., R&D Center, Ochang 28119, Korea.
| | - Ji-Hoon Kang
- Kang and Park Medical Co., R&D Center, Ochang 28119, Korea
| | - Sabine Weiss
- Department of Physical Metallurgy and Materials Technology, Brandenburg University of Technology, 03044 Cottbus, Germany
| | - Aleksei Obrosov
- Department of Physical Metallurgy and Materials Technology, Brandenburg University of Technology, 03044 Cottbus, Germany
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34
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Arteaga-Marrero N, Villa E, González-Fernández J, Martín Y, Ruiz-Alzola J. Polyvinyl alcohol cryogel phantoms of biological tissues for wideband operation at microwave frequencies. PLoS One 2019; 14:e0219997. [PMID: 31344092 PMCID: PMC6657873 DOI: 10.1371/journal.pone.0219997] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Accepted: 07/05/2019] [Indexed: 11/18/2022] Open
Abstract
The aim of this work is to provide a methodology to model the dielectric properties of human tissues based on phantoms prepared with an aqueous solution, in a semi-solid form, by using off-the-shelf components. Polyvinyl alcohol cryogel (PVA-C) has been employed as a novel gelling agent in the fabrication of phantoms for microwave applications in a wide frequency range, from 500 MHz to 20 GHz. Agar-based and deionized water phantoms have also been manufactured for comparison purposes. Mathematical models dependent on frequency and sucrose concentration are proposed to obtain the complex permittivity of the desired mimicked tissues. These models have been validated in the referred bandwidth showing a good agreement to experimental data for different sucrose concentrations. The PVA-C model provides a great performance as compared to agar, increasing the shelf-life of the phantoms and improving their consistency for contact-required devices. In addition, the feasibility of fabricating a multilayer phantom has been demonstrated with a two-layer phantom that exhibits a clear interface between each layer and its properties. Thus, the use of PVA-C extends the option for producing complex multilayer and multimodal phantoms.
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Affiliation(s)
- Natalia Arteaga-Marrero
- IACTec Medical Technology Group, Instituto de Astrofísica de Canarias (IAC), La Laguna, Santa Cruz de Tenerife, Spain
| | - Enrique Villa
- IACTec Medical Technology Group, Instituto de Astrofísica de Canarias (IAC), La Laguna, Santa Cruz de Tenerife, Spain
| | - Javier González-Fernández
- Departamento de Ingeniería Biomédica. Instituto Tecnológico de Canarias (ITC), Santa Cruz de Tenerife, Santa Cruz de Tenerife, Spain
| | - Yolanda Martín
- IACTec Medical Technology Group, Instituto de Astrofísica de Canarias (IAC), La Laguna, Santa Cruz de Tenerife, Spain
| | - Juan Ruiz-Alzola
- IACTec Medical Technology Group, Instituto de Astrofísica de Canarias (IAC), La Laguna, Santa Cruz de Tenerife, Spain
- Departamento de Señales y Comunicaciones. Instituto Universitario de Investigación Biomédica y Sanitaria (IUIBS). Universidad de Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Las Palmas, Spain
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35
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Koruk H, Choi JJ. Displacement of a bubble located at a fluid-viscoelastic medium interface. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2019; 145:EL410. [PMID: 31153355 DOI: 10.1121/1.5108678] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 04/29/2019] [Indexed: 06/09/2023]
Abstract
A model for estimating the displacement of a bubble located at a fluid-viscoelastic medium interface in response to acoustic radiation force is presented by extending the model for a spherical object embedded in a bulk material. The effects of the stiffness and viscosity of the viscoelastic medium and the amplitude and duration of the excitation force on bubble displacement were investigated using the proposed model. The results show that bubble displacement has a nonlinear relationship with excitation duration and viscosity. The time at which the steady state is reached increases with increasing medium viscosity and decreasing medium stiffness.
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Affiliation(s)
- Hasan Koruk
- Mechanical Engineering Department, MEF University, Istanbul 34396,
| | - James J Choi
- Department of Bioengineering, Imperial College London, London SW7 2AZ, United
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Pellionisz PA, Namiri NK, Suematsu G, Hu Y, Braganza A, Rangwalla K, Denson DJ, Badran K, Francis NC, Maccabi A, Saddik G, Taylor Z, St. John MA, Grundfest WS. Vibroacoustographic System for Tumor Identification. THE YALE JOURNAL OF BIOLOGY AND MEDICINE 2018; 91:215-223. [PMID: 30258308 PMCID: PMC6153624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Oral and head and neck squamous cell carcinoma (OSCC) is the sixth most common cancer worldwide. The primary management of OSCC relies on complete surgical resection of the tumor. Margin-free resection, however, is difficult given the devastating effects of aggressive surgery. Currently, surgeons determine where cuts are made by palpating edges of the tumor. Accuracy varies based on the surgeon's experience, the location and type of tumor, and the risk of damage to adjacent structures limiting resection margins. To fulfill this surgical need, we contrast tissue regions by identifying disparities in viscoelasticity by mixing two ultrasonic beams to produce a beat frequency, a technique termed vibroacoustography (VA). In our system, an extended focal length of the acoustic stress field yields surgeons' high resolution to detect focal lesions in deep tissue. VA offers 3D imaging by focusing its imaging plane at multiple axial cross-sections within tissue. Our efforts culminate in production of a mobile VA system generating image contrast between normal and abnormal tissue in minutes. We model the spatial direction of the generated acoustic field and generate images from tissue-mimicking phantoms and ex vivo specimens with squamous cell carcinoma of the tongue to qualitatively demonstrate the functionality of our system. These preliminary results warrant additional validation as we continue clinical trials of ex vivo tissue. This tool may prove especially useful for finding tumors that are deep within tissue and often missed by surgeons. The complete primary resection of tumors may reduce recurrence and ultimately improve patient outcomes.
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Affiliation(s)
- Peter A. Pellionisz
- Department of Head and Neck Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA,UCLA Head and Neck Cancer Program, David Geffen School of Medicine at UCLA, Los Angeles, CA,Department of Bioengineering, Henry Samueli School of Engineering and Applied Sciences, UCLA, Los Angeles, CA,Center for Advanced Surgical and Interventional Technology at Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA,Jonsson Comprehensive Cancer Center, David Geffen School of Medicine at UCLA, Los Angeles, CA
| | - Nikan K. Namiri
- Department of Bioengineering, Henry Samueli School of Engineering and Applied Sciences, UCLA, Los Angeles, CA,Center for Advanced Surgical and Interventional Technology at Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA
| | - Gregory Suematsu
- Department of Bioengineering, Henry Samueli School of Engineering and Applied Sciences, UCLA, Los Angeles, CA
| | - Yong Hu
- Department of Bioengineering, Henry Samueli School of Engineering and Applied Sciences, UCLA, Los Angeles, CA
| | - Ameet Braganza
- Department of Bioengineering, Henry Samueli School of Engineering and Applied Sciences, UCLA, Los Angeles, CA
| | - Khuzaima Rangwalla
- Department of Bioengineering, Henry Samueli School of Engineering and Applied Sciences, UCLA, Los Angeles, CA
| | | | - Karam Badran
- UCLA Head and Neck Cancer Program, David Geffen School of Medicine at UCLA, Los Angeles, CA,Department of Bioengineering, Henry Samueli School of Engineering and Applied Sciences, UCLA, Los Angeles, CA
| | - Nathan C. Francis
- Department of Bioengineering, Henry Samueli School of Engineering and Applied Sciences, UCLA, Los Angeles, CA
| | - Ashkan Maccabi
- Department of Bioengineering, Henry Samueli School of Engineering and Applied Sciences, UCLA, Los Angeles, CA,Center for Advanced Surgical and Interventional Technology at Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA
| | - George Saddik
- Department of Bioengineering, Henry Samueli School of Engineering and Applied Sciences, UCLA, Los Angeles, CA,Center for Advanced Surgical and Interventional Technology at Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA
| | - Zachary Taylor
- UCLA Head and Neck Cancer Program, David Geffen School of Medicine at UCLA, Los Angeles, CA,Department of Bioengineering, Henry Samueli School of Engineering and Applied Sciences, UCLA, Los Angeles, CA,Center for Advanced Surgical and Interventional Technology at Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA
| | - Maie A. St. John
- Department of Head and Neck Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA,UCLA Head and Neck Cancer Program, David Geffen School of Medicine at UCLA, Los Angeles, CA,Jonsson Comprehensive Cancer Center, David Geffen School of Medicine at UCLA, Los Angeles, CA
| | - Warren S. Grundfest
- Department of Bioengineering, Henry Samueli School of Engineering and Applied Sciences, UCLA, Los Angeles, CA,Center for Advanced Surgical and Interventional Technology at Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA,To whom all correspondence should be addressed: Warren S. Grundfest, MD, Department of Bioengineering, 4121H Engineering V, Los Angeles, CA 90095-1624; Tel: 310-794-5550, Fax: 310-794-5956,
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