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Fang S, Shi L, Vink JSY, Feltovich H, Hall TJ, Myers KM. Equilibrium Mechanical Properties of the Nonhuman Primate Cervix. J Biomech Eng 2024; 146:081001. [PMID: 38270929 PMCID: PMC10983698 DOI: 10.1115/1.4064558] [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: 11/30/2022] [Revised: 10/19/2023] [Accepted: 10/23/2023] [Indexed: 01/26/2024]
Abstract
Cervical remodeling is critical for a healthy pregnancy. Premature tissue changes can lead to preterm birth (PTB), and the absence of remodeling can lead to post-term birth, causing significant morbidity. Comprehensive characterization of cervical material properties is necessary to uncover the mechanisms behind abnormal cervical softening. Quantifying cervical material properties during gestation is challenging in humans. Thus, a nonhuman primate (NHP) model is employed for this study. In this study, cervical tissue samples were collected from Rhesus macaques before pregnancy and at three gestational time points. Indentation and tension mechanical tests were conducted, coupled with digital image correlation (DIC), constitutive material modeling, and inverse finite element analysis (IFEA) to characterize the equilibrium material response of the macaque cervix during pregnancy. Results show, as gestation progresses: (1) the cervical fiber network becomes more extensible (nonpregnant versus pregnant locking stretch: 2.03 ± 1.09 versus 2.99 ± 1.39) and less stiff (nonpregnant versus pregnant initial stiffness: 272 ± 252 kPa versus 43 ± 43 kPa); (2) the ground substance compressibility does not change much (nonpregnant versus pregnant bulk modulus: 1.37 ± 0.82 kPa versus 2.81 ± 2.81 kPa); (3) fiber network dispersion increases, moving from aligned to randomly oriented (nonpregnant versus pregnant concentration coefficient: 1.03 ± 0.46 versus 0.50 ± 0.20); and (4) the largest change in fiber stiffness and dispersion happen during the second trimester. These results, for the first time, reveal the remodeling process of a nonhuman primate cervix and its distinct regimes throughout the entire pregnancy.
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Affiliation(s)
- Shuyang Fang
- Department of Mechanical Engineering, Columbia University, New York, NY 10027
| | - Lei Shi
- Department of Mechanical Engineering, Columbia University, New York, NY 10027
| | - Joy-Sarah Y. Vink
- Department of Obstetrics and Gynecology, Columbia University, New York, NY 10027
| | - Helen Feltovich
- Department of Maternal Fetal Medicine, Intermountain Healthcare, Park City, UT 84060
| | - Timothy J. Hall
- Department of Medical Physics, University of Wisconsin-Madison, Madison, WI 53706
| | - Kristin M. Myers
- Department of Mechanical Engineering, Columbia University, New York, NY 10027
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2
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Moo EK, Ebrahimi M, Hrynevich A, de Ruijter M, Castilho M, Malda J, Korhonen RK. Load-induced fluid pressurisation in hydrogel systems before and after reinforcement by melt-electrowritten fibrous meshes. J Mech Behav Biomed Mater 2023; 143:105941. [PMID: 37285774 DOI: 10.1016/j.jmbbm.2023.105941] [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: 02/16/2023] [Revised: 05/25/2023] [Accepted: 05/28/2023] [Indexed: 06/09/2023]
Abstract
Fluid pressure develops transiently within mechanically-loaded, cell-embedding hydrogels, but its magnitude depends on the intrinsic material properties of the hydrogel and cannot be easily altered. The recently developed melt-electrowriting (MEW) technique enables three-dimensional printing of structured fibrous mesh with small fibre diameter (20 μm). The MEW mesh with 20 μm fibre diameter can synergistically increase the instantaneous mechanical stiffness of soft hydrogels. However, the reinforcing mechanism of the MEW meshes is not well understood, and may involve load-induced fluid pressurisation. Here, we examined the reinforcing effect of MEW meshes in three hydrogels: gelatin methacryloyl (GelMA), agarose and alginate, and the role of load-induced fluid pressurisation in the MEW reinforcement. We tested the hydrogels with and without MEW mesh (i.e., hydrogel alone, and MEW-hydrogel composite) using micro-indentation and unconfined compression, and analysed the mechanical data using biphasic Hertz and mixture models. We found that the MEW mesh altered the tension-to-compression modulus ratio differently for hydrogels that are cross-linked differently, which led to a variable change to their load-induced fluid pressurisation. MEW meshes only enhanced the fluid pressurisation for GelMA, but not for agarose or alginate. We speculate that only covalently cross-linked hydrogels (GelMA) can effectively tense the MEW meshes, thereby enhancing the fluid pressure developed during compressive loading. In conclusion, load-induced fluid pressurisation in selected hydrogels was enhanced by MEW fibrous mesh, and may be controlled by MEW mesh of different designs in the future, thereby making fluid pressure a tunable cell growth stimulus for tissue engineering involving mechanical stimulation.
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Affiliation(s)
- Eng Kuan Moo
- Department of Technical Physics, University of Eastern Finland, Finland; Department of Mechanical and Aerospace Engineering, Carleton University, Canada; Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Canada.
| | | | - Andrei Hrynevich
- Department of Orthopaedics, University Medical Center Utrecht, the Netherlands.
| | - Mylène de Ruijter
- Department of Orthopaedics, University Medical Center Utrecht, the Netherlands.
| | - Miguel Castilho
- Department of Orthopaedics, University Medical Center Utrecht, the Netherlands; Department of Biomedical Engineering, Eindhoven University of Technology, the Netherlands.
| | - Jos Malda
- Department of Orthopaedics, University Medical Center Utrecht, the Netherlands; Department of Clinical Sciences, Faculty of Veterinary Medicine, Utrecht University, the Netherlands.
| | - Rami K Korhonen
- Department of Technical Physics, University of Eastern Finland, Finland.
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3
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Sundar S, Linardi R, Gaesser A, Guo T, Ortved K, Engiles J, Parreno J, Dhong C. Optics-Free, In Situ Swelling Monitoring of Articular Cartilage with Graphene Strain Sensors. ACS Biomater Sci Eng 2023; 9:1011-1019. [PMID: 36701648 PMCID: PMC10123914 DOI: 10.1021/acsbiomaterials.2c01456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Articular cartilage derives its load-bearing strength from the mechanical and physiochemical coupling between the collagen network and negatively charged proteoglycans, respectively. Current disease modeling approaches and treatment strategies primarily focus on cartilage stiffness, partly because indentation tests are readily accessible. However, stiffness measurements via indentation alone cannot discriminate between proteoglycan degradation versus collagen degradation, and there is a lack of methods to monitor physiochemical contributors in full-stack tissue. To decouple these contributions, here, we developed a platform that measures tissue swelling in full-depth equine cartilage explants using piezoresistive graphene strain sensors. These piezoresistive strain sensors are embedded within an elastomer bulk and have sufficient sensitivity to resolve minute, real-time changes in swelling. By relying on simple DC resistance measurements over optical techniques, our platform can analyze multiple samples in parallel. Using these devices, we found that cartilage explants under enzymatic digestion showed distinctive swelling responses to a hypotonic challenge and established average equilibrium swelling strains in healthy cartilage (4.6%), cartilage with proteoglycan loss (0.5%), and in cartilage with both collagen and proteoglycan loss (-2.6%). Combined with histology, we decoupled the pathologic swelling responses as originating either from reduced fixed charge density or from loss of intrinsic stiffness of the collagen matrix in the superficial zone. By providing scalable and in situ monitoring of cartilage swelling, our platform could facilitate regenerative medicine approaches aimed at restoring osmotic function in osteoarthritic cartilage or could be used to validate physiologically relevant swelling behavior in synthetic hydrogels.
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Affiliation(s)
- Shalini Sundar
- Department of Biomedical Engineering, University of Delaware, Newark, Delaware, USA
| | - Renata Linardi
- Department of Clinical Studies, University of Pennsylvania School of Veterinary Medicine, New Bolton Center, Kennett Square, Pennsylvania, USA
| | - Angela Gaesser
- Department of Clinical Studies, University of Pennsylvania School of Veterinary Medicine, New Bolton Center, Kennett Square, Pennsylvania, USA
| | - Tianzheng Guo
- Department of Materials Science & Engineering, University of Delaware, Newark, Delaware, USA
| | - Kyla Ortved
- Department of Clinical Studies, University of Pennsylvania School of Veterinary Medicine, New Bolton Center, Kennett Square, Pennsylvania, USA
| | - Julie Engiles
- Department of Clinical Studies, University of Pennsylvania School of Veterinary Medicine, New Bolton Center, Kennett Square, Pennsylvania, USA
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania, USA
| | - Justin Parreno
- Department of Biomedical Engineering, University of Delaware, Newark, Delaware, USA
- Department of Biological Sciences, University of Delaware, Newark, Delaware, USA
| | - Charles Dhong
- Department of Biomedical Engineering, University of Delaware, Newark, Delaware, USA
- Department of Materials Science & Engineering, University of Delaware, Newark, Delaware, USA
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4
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Middendorf JM, Diamantides N, Kim B, Dugopolski C, Kennedy S, Blahut E, Cohen I, Bonassar LJ. The influence of chondrocyte source on the manufacturing reproducibility of human tissue engineered cartilage. Acta Biomater 2021; 131:276-285. [PMID: 34245892 DOI: 10.1016/j.actbio.2021.07.003] [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: 02/24/2021] [Revised: 06/29/2021] [Accepted: 07/01/2021] [Indexed: 11/16/2022]
Abstract
Multiple human tissue engineered cartilage constructs are showing promise in advanced clinical trials but identifying important measures of manufacturing reproducibility remains a challenge. FDA guidance suggests measuring multiple mechanical properties prior to implantation, because these properties could affect the long term success of the implant. Additionally, these engineered cartilage mechanics could be sensitive to the autologous chondrocyte source, an inherently irregular manufacturing starting material. If any mechanical properties are sensitive to changes in the autologous chondrocyte source, these properties may need to be measured prior to implantation to ensure manufacturing reproducibility and quality. Therefore, this study identified variability in the compressive, friction, and shear properties of a human tissue engineered cartilage constructs due to the chondrocyte source. Over 200 constructs were created from 7 different chondrocyte sources and tested using 3 distinct mechanical experiments. Under confined compression, the compressive properties (aggregate modulus and hydraulic permeability) varied by orders of magnitude due to the chondrocyte source. The friction coefficient changed by a factor of 5 due to the chondrocyte source and high intrapatient variability was noted. In contrast, the shear modulus was not affected by changes in the chondrocyte source. Finally, measurements on the local compressive and shear mechanics revealed variability in the depth dependent strain fields based on chondrocyte source. Since the chondrocyte source causes large amounts of variability in the compression and local mechanical properties of engineered cartilage, these mechanical properties may be important measures of manufacturing reproducibility. STATEMENT OF SIGNIFICANCE: Although the FDA recommends measuring mechanical properties of human tissue engineered cartilage constructs during manufacturing, the effect of manufacturing variability on construct mechanics is unknown. As one of the first studies to measure multiple mechanical properties on hundreds of human tissue engineered cartilage constructs, we found the compressive properties are most sensitive to changes in the autologous chondrocyte source, an inherently irregular manufacturing variable. This sensitivity to the autologous chondrocyte source reveals the compressive properties should be measured prior to implantation to assess manufacturing reproducibility.
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Affiliation(s)
- Jill M Middendorf
- Sibley School of Mechanical Engineering, Cornell University, Ithaca, NY, United States
| | - Nicole Diamantides
- Meinig School of Biomedical Engineering Cornell University, Ithaca, NY, United States
| | - Byumsu Kim
- Sibley School of Mechanical Engineering, Cornell University, Ithaca, NY, United States
| | | | | | - Eric Blahut
- Histogenics Corporation, Waltham, MA, United States
| | - Itai Cohen
- Department of Physics, Cornell University, Ithaca, NY, United States
| | - Lawrence J Bonassar
- Sibley School of Mechanical Engineering, Cornell University, Ithaca, NY, United States; Meinig School of Biomedical Engineering Cornell University, Ithaca, NY, United States.
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5
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Bravi Costantino ML, Belluzo MS, Oberti TG, Cortizo AM, Cortizo MS. Terpolymer-chitosan membranes as biomaterial. J Biomed Mater Res A 2021; 110:383-393. [PMID: 34397166 DOI: 10.1002/jbm.a.37295] [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: 05/02/2021] [Revised: 07/29/2021] [Accepted: 08/03/2021] [Indexed: 11/09/2022]
Abstract
The present study shows a novel copolymer synthesis, its application in the membrane design and the physicochemical and biological characterization of the biomaterial obtained. Terpolymer starting diisopropyl fumarate (F), vinyl benzoate (V) and 2-hydroxyethyl methacrylate (H) was prepared by thermal radical polymerization. This polymer (FVH) was obtained in several monomer ratios and characterized by spectroscopic and chromatographic methods (FTIR, 1 H-NMR and SEC). The best relationship of F:V:H was 5:4:1, which allows efficient interaction with chitosan through cross-linking with borax to achieve scaffolds for potential biomedical applications. The membranes were obtained by solvent casting and analyzed by scanning electron microscopy (SEM), swelling behavior and mechanical properties. In addition, we studied the possible cytotoxicity and biocompatibility of these materials using a murine macrophage-like cell line (RAW 264.7) and bone marrow mesenchymal progenitor cells (BMPC), respectively, taking into account their intended applications. The results of this study show that the terpolymer obtained and its combination with a natural polymer is a very interesting strategy to obtain a biomaterial with possible applications in regenerative medicine and this could be extended to other structurally related systems.
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Affiliation(s)
- María Leticia Bravi Costantino
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, UNLP-CONICET, La Plata, Argentina.,Laboratorio de Investigaciones en Osteopatías y Metabolismo Mineral (LIOMM), Facultad de Ciencias Exactas, UNLP-CIC, La Plata, Argentina
| | - María Soledad Belluzo
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, UNLP-CONICET, La Plata, Argentina
| | - Tamara G Oberti
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, UNLP-CONICET, La Plata, Argentina
| | - Ana M Cortizo
- Laboratorio de Investigaciones en Osteopatías y Metabolismo Mineral (LIOMM), Facultad de Ciencias Exactas, UNLP-CIC, La Plata, Argentina
| | - María Susana Cortizo
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, UNLP-CONICET, La Plata, Argentina
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6
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Bonifacio MA, Cochis A, Cometa S, Gentile P, Scalzone A, Scalia AC, Rimondini L, De Giglio E. From the sea to the bee: Gellan gum-honey-diatom composite to deliver resveratrol for cartilage regeneration under oxidative stress conditions. Carbohydr Polym 2020; 245:116410. [DOI: 10.1016/j.carbpol.2020.116410] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 05/03/2020] [Accepted: 05/03/2020] [Indexed: 01/22/2023]
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7
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Middendorf JM, Diamantides N, Shortkroff S, Dugopolski C, Kennedy S, Cohen I, Bonassar LJ. Multiscale mechanics of tissue-engineered cartilage grown from human chondrocytes and human-induced pluripotent stem cells. J Orthop Res 2020; 38:1965-1973. [PMID: 32125023 DOI: 10.1002/jor.24643] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 02/17/2020] [Accepted: 02/29/2020] [Indexed: 02/04/2023]
Abstract
Tissue-engineered cartilage has shown promising results in the repair of focal cartilage defects. However, current clinical techniques rely on an extra surgical procedure to biopsy healthy cartilage to obtain human chondrocytes. Alternatively, induced pluripotent stem cells (iPSCs) have the ability to differentiate into chondrocytes and produce cartilaginous matrix without the need to biopsy healthy cartilage. However, the mechanical properties of tissue-engineered cartilage with iPSCs are unknown and might be critical to long-term tissue function and health. This study used confined compression, cartilage on glass tribology, and shear testing on a confocal microscope to assess the macroscale and microscale mechanical properties of two constructs seeded with either chondrocyte-derived iPSCs (Ch-iPSCs) or native human chondrocytes. Macroscale properties of Ch-iPSC constructs provided similar or better mechanical properties than chondrocyte constructs. Under compression, Ch-iPSC constructs had an aggregate modulus that was two times larger than chondrocyte constructs and was closer to native tissue. No differences in the shear modulus and friction coefficients were observed between Ch-iPSC and chondrocyte constructs. On the microscale, Ch-iPSC and chondrocyte constructs had different depth-dependent mechanical properties, neither of which matches native tissue. These observed depth-dependent differences may be important to the function of the implant. Overall, this comparison of multiple mechanical properties of Ch-iPSC and chondrocyte constructs shows that using Ch-iPSCs can produce equivalent or better global mechanical properties to chondrocytes. Therefore, iPSC-seeded cartilage constructs could be a promising solution to repair focal cartilage defects. The chondrocyte constructs used in this study have been implanted into humans for clinical trials. Therefore, Ch-iPSC constructs could also be used clinically in place of the current chondrocyte construct.
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Affiliation(s)
- Jill M Middendorf
- Sibley School of Mechanical Engineering, Cornell University, Ithaca, New York
| | - Nicole Diamantides
- Meinig School of Biomedical Engineering, Cornell University, Ithaca, New York
| | | | | | | | - Itai Cohen
- Department of Applied Engineering and Physics, Cornell University, Ithaca, New York.,Department of Physics, Cornell University, Ithaca, New York
| | - Lawrence J Bonassar
- Sibley School of Mechanical Engineering, Cornell University, Ithaca, New York.,Meinig School of Biomedical Engineering, Cornell University, Ithaca, New York
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8
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Nonlinear stress-dependent recovery behavior of the intervertebral disc. J Mech Behav Biomed Mater 2020; 110:103881. [PMID: 32957189 DOI: 10.1016/j.jmbbm.2020.103881] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 04/22/2020] [Accepted: 05/23/2020] [Indexed: 12/17/2022]
Abstract
The intervertebral disc exhibits complex mechanics due to its heterogeneous structure, inherent viscoelasticity, and interstitial fluid-matrix interactions. Sufficient fluid flow into the disc during low loading periods is important for maintaining mechanics and nutrient transport. However, there is a lack of knowledge on the effect of loading magnitude on time-dependent recovery behavior and the relative contribution of multiple recovery mechanisms during recovery. In most studies that have evaluated disc recovery behavior, a single load condition has been considered, making it difficult to compare findings across studies. Hence, the objective of this study was to quantify unloaded disc recovery behavior after compressive creep loading under a wide range of physiologically relevant stresses (0.2-2 MPa). First, the repeatability of disc recovery behavior was assessed. Once repeatable recovery behavior was confirmed, each motion segment was subject to three cycles of creep-recovery loading, where each cycle consisted of a 24-h creep at a pre-assigned load (100, 200, 300, 600, 900, or 1200 N), followed by an 18-h recovery period at a nominal load (10 N). Results showed that disc recovery behavior was strongly influenced by the magnitude of loading. The magnitude of instantaneous and time-dependent recovery deformations increased nonlinearly with an increase in compressive stress during creep. In conclusion, this study highlights that elastic deformation, intrinsic viscoelasticity, and poroelasticity all have substantial contributions to disc height recovery during low loading periods. However, their relative contributions to disc height recovery largely depend on the magnitude of loading. While loading history does not influence the contribution of the short-term recovery, the contribution of long-term recovery is highly sensitive to loading magnitude.
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9
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Chung JHY, Kade JC, Jeiranikhameneh A, Ruberu K, Mukherjee P, Yue Z, Wallace GG. 3D hybrid printing platform for auricular cartilage reconstruction. Biomed Phys Eng Express 2020; 6:035003. [DOI: 10.1088/2057-1976/ab54a7] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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10
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Advances in cartilage repair: The influence of inorganic clays to improve mechanical and healing properties of antibacterial Gellan gum-Manuka honey hydrogels. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 108:110444. [DOI: 10.1016/j.msec.2019.110444] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 10/31/2019] [Accepted: 11/15/2019] [Indexed: 12/15/2022]
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11
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Cipollaro L, Ciardulli MC, Della Porta G, Peretti GM, Maffulli N. Biomechanical issues of tissue-engineered constructs for articular cartilage regeneration: in vitro and in vivo approaches. Br Med Bull 2019; 132:53-80. [PMID: 31854445 DOI: 10.1093/bmb/ldz034] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/17/2019] [Indexed: 01/04/2023]
Abstract
BACKGROUND Given the limited regenerative capacity of injured articular cartilage, the absence of suitable therapeutic options has encouraged tissue-engineering approaches for its regeneration or replacement. SOURCES OF DATA Published articles in any language identified in PubMed and Scopus electronic databases up to August 2019 about the in vitro and in vivo properties of cartilage engineered constructs. A total of 64 articles were included following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. AREAS OF AGREEMENT Regenerated cartilage lacks the biomechanical and biological properties of native articular cartilage. AREAS OF CONTROVERSY There are many different approaches about the development of the architecture and the composition of the scaffolds. GROWING POINTS Novel tissue engineering strategies focus on the development of cartilaginous biomimetic materials able to repair cartilage lesions in association to cell, trophic factors and gene therapies. AREAS TIMELY FOR DEVELOPING RESEARCH A multi-layer design and a zonal organization of the constructs may lead to achieve cartilage regeneration.
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Affiliation(s)
- Lucio Cipollaro
- Department of Musculoskeletal Disorders, Faculty of Medicine and Surgery, University of Salerno, Via San Leonardo 1, 84131 Salerno, Italy
- Department of Medicine, Surgery and Dentistry, University of Salerno, Via S. Allende, 84081 Baronissi (SA), Italy
| | - Maria Camilla Ciardulli
- Department of Medicine, Surgery and Dentistry, University of Salerno, Via S. Allende, 84081 Baronissi (SA), Italy
| | - Giovanna Della Porta
- Department of Medicine, Surgery and Dentistry, University of Salerno, Via S. Allende, 84081 Baronissi (SA), Italy
| | - Giuseppe M Peretti
- IRCCS Istituto Ortopedico Galeazzi, Via Riccardo Galeazzi 4, 20161 Milan, Italy
- Department of Biomedical Sciences for Health, University of Milan, via Mangiagalli 31, 20133, Milan, Italy
| | - Nicola Maffulli
- Department of Musculoskeletal Disorders, Faculty of Medicine and Surgery, University of Salerno, Via San Leonardo 1, 84131 Salerno, Italy
- Department of Medicine, Surgery and Dentistry, University of Salerno, Via S. Allende, 84081 Baronissi (SA), Italy
- Centre for Sports and Exercise Medicine, Barts and The London School of Medicine and Dentistry, Mile End Hospital, 275 Bancroft Road, London E1 4DG, Queen Mary University of London, London, UK
- Institute of Science and Technology in Medicine, Keele University School of Medicine, Thornburrow Drive, Stoke on Trent, UK
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12
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Scalzone A, Ferreira AM, Tonda-Turo C, Ciardelli G, Dalgarno K, Gentile P. The interplay between chondrocyte spheroids and mesenchymal stem cells boosts cartilage regeneration within a 3D natural-based hydrogel. Sci Rep 2019; 9:14630. [PMID: 31601910 PMCID: PMC6787336 DOI: 10.1038/s41598-019-51070-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Accepted: 09/25/2019] [Indexed: 12/30/2022] Open
Abstract
Articular cartilage (AC) lacks the ability to self-repair and cell-based approaches, primarily based on using chondrocytes and mesenchymal stem cells (MSCs), are emerging as effective technology to restore cartilage functionality, because cells synergic functionality may support the maintenance of chondrogenic phenotype and promote extracellular matrix regeneration. This work aims to develop a more physiologically representative co-culture system to investigate the influence of MSCs on the activity of chondrocytes. A thermo-sensitive chitosan-based hydrogel, ionically crosslinked with β–glycerophosphate, is optimised to obtain sol/gel transition at physiological conditions within 5 minutes, high porosity with pores diameter <30 µm, and in vitro mechanical integrity with compressive and equilibrium Young’s moduli of 37 kPa and 17 kPa, respectively. Live/dead staining showed that after 1 and 3 days in culture, the encapsulated MSCs into the hydrogels are viable and characterised by round-like morphology. Furthermore chondrocyte spheroids, seeded on top of gels that contained either MSCs or no cells, show that the encapsulated MSCs stimulate chondrocyte activity within a gel co-culture, both in terms of maintaining the coherence of chondrocyte spheroids, leading to a larger quantity of CD44 (by immunofluorescence) and a higher production of collagen and glycosaminoglycans (by histology) compared with the mono-culture.
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Affiliation(s)
- Annachiara Scalzone
- School of Engineering, Newcastle University, Claremont Road, Newcastle upon Tyne, NE1 7RU, United Kingdom
| | - Ana M Ferreira
- School of Engineering, Newcastle University, Claremont Road, Newcastle upon Tyne, NE1 7RU, United Kingdom
| | - Chiara Tonda-Turo
- Department of Mechanical and Aerospace Engineering (DIMEAS), Politecnico di Torino Corso Duca degli Abruzzi 29, Turin, 10129, Italy
| | - Gianluca Ciardelli
- Department of Mechanical and Aerospace Engineering (DIMEAS), Politecnico di Torino Corso Duca degli Abruzzi 29, Turin, 10129, Italy
| | - Kenny Dalgarno
- School of Engineering, Newcastle University, Claremont Road, Newcastle upon Tyne, NE1 7RU, United Kingdom
| | - Piergiorgio Gentile
- School of Engineering, Newcastle University, Claremont Road, Newcastle upon Tyne, NE1 7RU, United Kingdom.
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13
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Munir N, Callanan A. Novel phase separated polycaprolactone/collagen scaffolds for cartilage tissue engineering. Biomed Mater 2018; 13:051001. [DOI: 10.1088/1748-605x/aac91f] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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14
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Anderson DE, Johnstone B. Dynamic Mechanical Compression of Chondrocytes for Tissue Engineering: A Critical Review. Front Bioeng Biotechnol 2017; 5:76. [PMID: 29322043 PMCID: PMC5732133 DOI: 10.3389/fbioe.2017.00076] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 11/23/2017] [Indexed: 01/19/2023] Open
Abstract
Articular cartilage functions to transmit and translate loads. In a classical structure-function relationship, the tissue resides in a dynamic mechanical environment that drives the formation of a highly organized tissue architecture suited to its biomechanical role. The dynamic mechanical environment includes multiaxial compressive and shear strains as well as hydrostatic and osmotic pressures. As the mechanical environment is known to modulate cell fate and influence tissue development toward a defined architecture in situ, dynamic mechanical loading has been hypothesized to induce the structure-function relationship during attempts at in vitro regeneration of articular cartilage. Researchers have designed increasingly sophisticated bioreactors with dynamic mechanical regimes, but the response of chondrocytes to dynamic compression and shear loading remains poorly characterized due to wide variation in study design, system variables, and outcome measurements. We assessed the literature pertaining to the use of dynamic compressive bioreactors for in vitro generation of cartilaginous tissue from primary and expanded chondrocytes. We used specific search terms to identify relevant publications from the PubMed database and manually sorted the data. It was very challenging to find consensus between studies because of species, age, cell source, and culture differences, coupled with the many loading regimes and the types of analyses used. Early studies that evaluated the response of primary bovine chondrocytes within hydrogels, and that employed dynamic single-axis compression with physiologic loading parameters, reported consistently favorable responses at the tissue level, with upregulation of biochemical synthesis and biomechanical properties. However, they rarely assessed the cellular response with gene expression or mechanotransduction pathway analyses. Later studies that employed increasingly sophisticated biomaterial-based systems, cells derived from different species, and complex loading regimes, did not necessarily corroborate prior positive results. These studies report positive results with respect to very specific conditions for cellular responses to dynamic load but fail to consistently achieve significant positive changes in relevant tissue engineering parameters, particularly collagen content and stiffness. There is a need for standardized methods and analyses of dynamic mechanical loading systems to guide the field of tissue engineering toward building cartilaginous implants that meet the goal of regenerating articular cartilage.
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Affiliation(s)
- Devon E Anderson
- Department of Orthopaedics and Rehabilitation, Oregon Health & Science University, Portland, OR, United States
| | - Brian Johnstone
- Department of Orthopaedics and Rehabilitation, Oregon Health & Science University, Portland, OR, United States
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15
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Middendorf JM, Griffin DJ, Shortkroff S, Dugopolski C, Kennedy S, Siemiatkoski J, Cohen I, Bonassar LJ. Mechanical properties and structure-function relationships of human chondrocyte-seeded cartilage constructs after in vitro culture. J Orthop Res 2017; 35:2298-2306. [PMID: 28169453 DOI: 10.1002/jor.23535] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Accepted: 01/27/2017] [Indexed: 02/04/2023]
Abstract
Autologous Chondrocyte Implantation (ACI) is a widely recognized method for the repair of focal cartilage defects. Despite the accepted use, problems with this technique still exist, including graft hypertrophy, damage to surrounding tissue by sutures, uneven cell distribution, and delamination. Modified ACI techniques overcome these challenges by seeding autologous chondrocytes onto a 3D scaffold and securing the graft into the defect. Many studies on these tissue engineered grafts have identified the compressive properties, but few have examined frictional and shear properties as suggested by FDA guidance. This study is the first to perform three mechanical tests (compressive, frictional, and shear) on human tissue engineered cartilage. The objective was to understand the complex mechanical behavior, function, and changes that occur with time in these constructs grown in vitro using compression, friction, and shear tests. Safranin-O histology and a DMMB assay both revealed increased sulfated glycosaminoglycan (sGAG) content in the scaffolds with increased maturity. Similarly, immunohistochemistry revealed increased lubricin localization on the construct surface. Confined compression and friction tests both revealed improved properties with increased construct maturity. Compressive properties correlated with the sGAG content, while improved friction coefficients were attributed to increased lubricin localization on the construct surfaces. In contrast, shear properties did not improve with increased culture time. This study suggests the various mechanical and biological properties of tissue engineered cartilage improve at different rates, indicating thorough mechanical evaluation of tissue engineered cartilage is critical to understanding the performance of repaired cartilage. © 2017 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:2298-2306, 2017.
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Affiliation(s)
- Jill M Middendorf
- Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York
| | - Darvin J Griffin
- Meinig School of Biomedical Engineering, Cornell University, Ithaca, New York
| | | | | | | | | | - Itai Cohen
- Department of Physics, Cornell University, Ithaca, New York
| | - Lawrence J Bonassar
- Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York.,Meinig School of Biomedical Engineering, Cornell University, Ithaca, New York
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16
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Effect of collagen fibre orientation on intervertebral disc torsion mechanics. Biomech Model Mechanobiol 2017; 16:2005-2015. [PMID: 28733922 DOI: 10.1007/s10237-017-0934-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Accepted: 07/11/2017] [Indexed: 12/27/2022]
Abstract
The intervertebral disc is a complex fibro-cartilaginous material, consisting of a pressurized nucleus pulposus surrounded by the annulus fibrosus, which has an angle-ply structure. Disc injury and degeneration are noted by significant changes in tissue structure and function, which significantly alters stress distribution and disc joint stiffness. Differences in fibre orientation are thought to contribute to changes in disc torsion mechanics. Therefore, the objective of this study was to evaluate the effect of collagen fibre orientation on internal disc mechanics under compression combined with axial rotation. We developed and validated a finite element model (FEM) to delineate changes in disc mechanics due to fibre orientation from differences in material properties. FEM simulations were performed with fibres oriented at [Formula: see text] throughout the disc (uniform by region and fibre layer). The initial model was validated by published experimental results for two load conditions, including [Formula: see text] axial compression and [Formula: see text] axial rotation. Once validated, fibre orientation was rotated by [Formula: see text] or [Formula: see text] towards the horizontal plane, resulting in a decrease in disc joint torsional stiffness. Furthermore, we observed that axial rotation caused a sinusoidal change in disc height and radial bulge, which may be beneficial for nutrient transport. In conclusion, including anatomically relevant fibre angles in disc joint FEMs is important for understanding stress distribution throughout the disc and will be important for understanding potential causes for disc injury. Future models will include regional differences in fibre orientation to better represent the fibre architecture of the native disc.
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17
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Lastra ML, Molinuevo MS, Cortizo AM, Cortizo MS. Fumarate Copolymer-Chitosan Cross-Linked Scaffold Directed to Osteochondrogenic Tissue Engineering. Macromol Biosci 2016; 17. [DOI: 10.1002/mabi.201600219] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Revised: 09/30/2016] [Indexed: 11/09/2022]
Affiliation(s)
- María Laura Lastra
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA); Facultad de Ciencias Exactas; Universidad Nacional de La Plata (UNLP); CCT- La Plata, CONICET CC 16, Suc. 4. Argentina
- Laboratorio de Investigaciones en Osteopatías y Metabolismo Mineral (LIOMM); Departamento de Ciencias Biológicas; Facultad de Cs. Exactas; Universidad Nacional de La Plata; 47 y 115 (1900) La Plata Argentina
| | - María Silvina Molinuevo
- Laboratorio de Investigaciones en Osteopatías y Metabolismo Mineral (LIOMM); Departamento de Ciencias Biológicas; Facultad de Cs. Exactas; Universidad Nacional de La Plata; 47 y 115 (1900) La Plata Argentina
| | - Ana María Cortizo
- Laboratorio de Investigaciones en Osteopatías y Metabolismo Mineral (LIOMM); Departamento de Ciencias Biológicas; Facultad de Cs. Exactas; Universidad Nacional de La Plata; 47 y 115 (1900) La Plata Argentina
| | - María Susana Cortizo
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA); Facultad de Ciencias Exactas; Universidad Nacional de La Plata (UNLP); CCT- La Plata, CONICET CC 16, Suc. 4. Argentina
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18
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Saxena V, Kim M, Keah NM, Neuwirth AL, Stoeckl BD, Bickard K, Restle DJ, Salowe R, Wang MY, Steinberg DR, Mauck RL. Anatomic Mesenchymal Stem Cell-Based Engineered Cartilage Constructs for Biologic Total Joint Replacement. Tissue Eng Part A 2016; 22:386-95. [PMID: 26871863 DOI: 10.1089/ten.tea.2015.0384] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Cartilage has a poor healing response, and few viable options exist for repair of extensive damage. Hyaluronic acid (HA) hydrogels seeded with mesenchymal stem cells (MSCs) polymerized through UV crosslinking can generate functional tissue, but this crosslinking is not compatible with indirect rapid prototyping utilizing opaque anatomic molds. Methacrylate-modified polymers can also be chemically crosslinked in a cytocompatible manner using ammonium persulfate (APS) and N,N,N',N'-tetramethylethylenediamine (TEMED). The objectives of this study were to (1) compare APS/TEMED crosslinking with UV crosslinking in terms of functional maturation of MSC-seeded HA hydrogels; (2) generate an anatomic mold of a complex joint surface through rapid prototyping; and (3) grow anatomic MSC-seeded HA hydrogel constructs using this alternative crosslinking method. Juvenile bovine MSCs were suspended in methacrylated HA (MeHA) and crosslinked either through UV polymerization or chemically with APS/TEMED to generate cylindrical constructs. Minipig porcine femoral heads were imaged using microCT, and anatomic negative molds were generated by three-dimensional printing using fused deposition modeling. Molded HA constructs were produced using the APS/TEMED method. All constructs were cultured for up to 12 weeks in a chemically defined medium supplemented with TGF-β3 and characterized by mechanical testing, biochemical assays, and histologic analysis. Both UV- and APS/TEMED-polymerized constructs showed increasing mechanical properties and robust proteoglycan and collagen deposition over time. At 12 weeks, APS/TEMED-polymerized constructs had higher equilibrium and dynamic moduli than UV-polymerized constructs, with no differences in proteoglycan or collagen content. Molded HA constructs retained their hemispherical shape in culture and demonstrated increasing mechanical properties and proteoglycan and collagen deposition, especially at the edges compared to the center of these larger constructs. Immunohistochemistry showed abundant collagen type II staining and little collagen type I staining. APS/TEMED crosslinking can be used to produce MSC-seeded HA-based neocartilage and can be used in combination with rapid prototyping techniques to generate anatomic MSC-seeded HA constructs for use in filling large and anatomically complex chondral defects or for biologic joint replacement.
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Affiliation(s)
- Vishal Saxena
- 1 McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania , Philadelphia, Pennsylvania.,2 Translational Musculoskeletal Research Center, Philadelphia Veterans Affairs Medical Center , Philadelphia, Pennsylvania
| | - Minwook Kim
- 1 McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania , Philadelphia, Pennsylvania.,2 Translational Musculoskeletal Research Center, Philadelphia Veterans Affairs Medical Center , Philadelphia, Pennsylvania.,3 Department of Bioengineering, University of Pennsylvania , Philadelphia, Pennsylvania
| | - Niobra M Keah
- 1 McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania , Philadelphia, Pennsylvania.,2 Translational Musculoskeletal Research Center, Philadelphia Veterans Affairs Medical Center , Philadelphia, Pennsylvania
| | - Alexander L Neuwirth
- 1 McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania , Philadelphia, Pennsylvania.,2 Translational Musculoskeletal Research Center, Philadelphia Veterans Affairs Medical Center , Philadelphia, Pennsylvania
| | - Brendan D Stoeckl
- 1 McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania , Philadelphia, Pennsylvania.,2 Translational Musculoskeletal Research Center, Philadelphia Veterans Affairs Medical Center , Philadelphia, Pennsylvania
| | - Kevin Bickard
- 1 McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania , Philadelphia, Pennsylvania.,3 Department of Bioengineering, University of Pennsylvania , Philadelphia, Pennsylvania
| | - David J Restle
- 1 McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania , Philadelphia, Pennsylvania.,3 Department of Bioengineering, University of Pennsylvania , Philadelphia, Pennsylvania
| | - Rebecca Salowe
- 1 McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania , Philadelphia, Pennsylvania.,3 Department of Bioengineering, University of Pennsylvania , Philadelphia, Pennsylvania
| | - Margaret Ye Wang
- 1 McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania , Philadelphia, Pennsylvania.,3 Department of Bioengineering, University of Pennsylvania , Philadelphia, Pennsylvania
| | - David R Steinberg
- 1 McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania , Philadelphia, Pennsylvania.,2 Translational Musculoskeletal Research Center, Philadelphia Veterans Affairs Medical Center , Philadelphia, Pennsylvania
| | - Robert L Mauck
- 1 McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania , Philadelphia, Pennsylvania.,2 Translational Musculoskeletal Research Center, Philadelphia Veterans Affairs Medical Center , Philadelphia, Pennsylvania.,3 Department of Bioengineering, University of Pennsylvania , Philadelphia, Pennsylvania
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19
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Cigan AD, Durney KM, Nims RJ, Vunjak-Novakovic G, Hung CT, Ateshian GA. Nutrient Channels Aid the Growth of Articular Surface-Sized Engineered Cartilage Constructs. Tissue Eng Part A 2016; 22:1063-74. [PMID: 27481330 DOI: 10.1089/ten.tea.2016.0179] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Symptomatic osteoarthritic lesions span large regions of joint surfaces and the ability to engineer cartilage constructs at clinically relevant sizes would be highly desirable. We previously demonstrated that nutrient transport limitations can be mitigated by the introduction of channels in 10 mm diameter cartilage constructs. In this study, we scaled up our previous system to cast and cultivate 40 mm diameter constructs (2.3 mm overall thickness); 4 mm diameter and channeled 10 mm diameter constructs were studied for comparison. Furthermore, to assess whether prior results using primary bovine cells are applicable for passaged cells-a more clinically realistic scenario-we cast constructs of each size with primary or twice-passaged cells. Constructs were assessed mechanically for equilibrium compressive Young's modulus (EY), dynamic modulus at 0.01 Hz (G*), and friction coefficient (μ); they were also assessed biochemically, histologically, and immunohistochemically for glycosaminoglycan (GAG) and collagen contents. By maintaining open channels, we successfully cultured robust constructs the size of entire human articular cartilage layers (growing to ∼52 mm in diameter, 4 mm thick, mass of 8 g by day 56), representing a 100-fold increase in scale over our 4 mm diameter constructs, without compromising their functional properties. Large constructs reached EY of up to 623 kPa and GAG contents up to 8.9%/ww (% of wet weight), both within native cartilage ranges, had G* >2 MPa, and up to 3.5%/ww collagen. Constructs also exhibited some of the lowest μ reported for engineered cartilage (0.06-0.11). Passaged cells produced tissue of lower quality, but still exhibited native EY and GAG content, similar to their smaller controls. The constructs produced in this study are, to our knowledge, the largest engineered cartilage constructs to date which possess native EY and GAG, and are a testament to the effectiveness of nutrient channels in overcoming transport limitations in cartilage tissue engineering.
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Affiliation(s)
- Alexander D Cigan
- 1 Department of Biomedical Engineering, Columbia University , New York, New York
| | - Krista M Durney
- 1 Department of Biomedical Engineering, Columbia University , New York, New York
| | - Robert J Nims
- 1 Department of Biomedical Engineering, Columbia University , New York, New York
| | - Gordana Vunjak-Novakovic
- 1 Department of Biomedical Engineering, Columbia University , New York, New York
- 2 Department of Medicine, Columbia University , New York, New York
| | - Clark T Hung
- 1 Department of Biomedical Engineering, Columbia University , New York, New York
| | - Gerard A Ateshian
- 1 Department of Biomedical Engineering, Columbia University , New York, New York
- 3 Department of Mechanical Engineering, Columbia University , New York, New York
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20
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Pfeifer CG, Fisher MB, Carey JL, Mauck RL. Impact of guidance documents on translational large animal studies of cartilage repair. Sci Transl Med 2016; 7:310re9. [PMID: 26491080 DOI: 10.1126/scitranslmed.aac7019] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Promising therapies for cartilage repair are translated through large animal models toward human application. To guide this work, regulatory agencies publish recommendations ("guidance documents") to direct pivotal large animal studies. These are meant to aid in study design, outline metrics for judging efficacy, and facilitate comparisons between studies. To determine the penetrance of these documents in the field, we synthesized the recommendations of the American Society for Testing and Materials, U.S. Food and Drug Administration, and European Medicines Agency into a scoring system and performed a systematic review of the past 20 years of preclinical cartilage repair studies. Our hypothesis was that the guidance documents would have a significant impact on how large animal cartilage repair studies were performed. A total of 114 publications meeting our inclusion criteria were reviewed for adherence to 24 categories extracted from the guidance documents, including 11 related to study design and description and 13 related to study outcomes. Overall, a weak positive trend was observed over time (P = 0.004, R(2) = 0.07, slope = 0.63%/year), with overall adherence (the sum of study descriptors and outcomes) ranging from 32 ± 16% to 58 ± 14% in any individual year. There was no impact of the publication of the guidance documents on adherence (P = 0.264 to 0.50). Given that improved adherence would expedite translation, we discuss the reasons for poor adherence and outline approaches to increase and promote their more widespread adoption.
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Affiliation(s)
- Christian G Pfeifer
- McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. Translational Musculoskeletal Research Center, Philadelphia Veterans Affairs Medical Center, Philadelphia, PA 19104, USA. Department of Trauma Surgery, Regensburg University Medical Center, 93053 Regensburg, Germany
| | - Matthew B Fisher
- McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. Translational Musculoskeletal Research Center, Philadelphia Veterans Affairs Medical Center, Philadelphia, PA 19104, USA. Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, and North Carolina State University, Raleigh, NC 27695, USA
| | - James L Carey
- McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. Translational Musculoskeletal Research Center, Philadelphia Veterans Affairs Medical Center, Philadelphia, PA 19104, USA
| | - Robert L Mauck
- McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA. Translational Musculoskeletal Research Center, Philadelphia Veterans Affairs Medical Center, Philadelphia, PA 19104, USA. Department of Bioengineering, University of Pennsylvania, Philadelphia, PA 19104, USA. Collaborative Research Partner, Acute Cartilage Injury Program of the AO Foundation, 7270 Davos, Switzerland.
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21
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Bezci SE, Nandy A, O'Connell GD. Effect of Hydration on Healthy Intervertebral Disk Mechanical Stiffness. J Biomech Eng 2016; 137:101007. [PMID: 26300418 DOI: 10.1115/1.4031416] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2014] [Indexed: 11/08/2022]
Abstract
The intervertebral disk has an excellent swelling capacity to absorb water, which is thought to be largely due to the high proteoglycan composition. Injury, aging, degeneration, and diurnal loading are all noted by a significant decrease in water content and tissue hydration. The objective of this study was to evaluate the effect of hydration, through osmotic loading, on tissue swelling and compressive stiffness of healthy intervertebral disks. The wet weight of nucleus pulposus (NP) and annulus fibrosus (AF) explants following swelling was 50% or greater, demonstrating significant ability to absorb water under all osmotic loading conditions (0.015 M-3.0 M phosphate buffered saline (PBS)). Estimated NP residual strains, calculated from the swelling ratio, were approximately 1.5 × greater than AF residual strains. Compressive stiffness increased with hyperosmotic loading, which is thought to be due to material compaction from osmotic-loading and the nonlinear mechanical behavior. Importantly, this study demonstrated that residual strains and material properties are greatly dependent on osmotic loading. The findings of this study support the notion that swelling properties from osmotic loading will be important for accurately describing the effect of degeneration and injury on disk mechanics. Furthermore, the tissue swelling will be an important consideration for developing biological repair strategies aimed at restoring mechanical behavior toward a healthy disk.
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22
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Cigan AD, Roach BL, Nims RJ, Tan AR, Albro MB, Stoker AM, Cook JL, Vunjak-Novakovic G, Hung CT, Ateshian GA. High seeding density of human chondrocytes in agarose produces tissue-engineered cartilage approaching native mechanical and biochemical properties. J Biomech 2016; 49:1909-1917. [PMID: 27198889 DOI: 10.1016/j.jbiomech.2016.04.039] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Revised: 04/28/2016] [Accepted: 04/30/2016] [Indexed: 12/21/2022]
Abstract
Animal cells have served as highly controllable model systems for furthering cartilage tissue engineering practices in pursuit of treating osteoarthritis. Although successful strategies for animal cells must ultimately be adapted to human cells to be clinically relevant, human chondrocytes are rarely employed in such studies. In this study, we evaluated the applicability of culture techniques established for juvenile bovine and adult canine chondrocytes to human chondrocytes obtained from fresh or expired osteochondral allografts. Human chondrocytes were expanded and encapsulated in 2% agarose scaffolds measuring ∅3-4mm×2.3mm, with cell seeding densities ranging from 15 to 90×10(6)cells/mL. Subsets of constructs were subjected to transient or sustained TGF-β treatment, or provided channels to enhance nutrient transport. Human cartilaginous constructs physically resembled native human cartilage, and reached compressive Young's moduli of up to ~250kPa (corresponding to the low end of ranges reported for native knee cartilage), dynamic moduli of ~950kPa (0.01Hz), and contained 5.7% wet weight (%/ww) of glycosaminoglycans (≥ native levels) and 1.5%/ww collagen. We found that the initial seeding density had pronounced effects on tissue outcomes, with high cell seeding densities significantly increasing nearly all measured properties. Transient TGF-β treatment was ineffective for adult human cells, and tissue construct properties plateaued or declined beyond 28 days of culture. Finally, nutrient channels improved construct mechanical properties, presumably due to enhanced rates of mass transport. These results demonstrate that our previously established culture system can be successfully translated to human chondrocytes.
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Affiliation(s)
- Alexander D Cigan
- Department of Biomedical Engineering, Columbia University, New York, NY 10027, USA
| | - Brendan L Roach
- Department of Biomedical Engineering, Columbia University, New York, NY 10027, USA
| | - Robert J Nims
- Department of Biomedical Engineering, Columbia University, New York, NY 10027, USA
| | - Andrea R Tan
- Department of Biomedical Engineering, Columbia University, New York, NY 10027, USA
| | - Michael B Albro
- Department of Materials, Imperial College London, London, UK
| | | | | | - Gordana Vunjak-Novakovic
- Department of Biomedical Engineering, Columbia University, New York, NY 10027, USA; Department of Medicine, Columbia University, New York, NY 10032, USA
| | - Clark T Hung
- Department of Biomedical Engineering, Columbia University, New York, NY 10027, USA
| | - Gerard A Ateshian
- Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA; Department of Biomedical Engineering, Columbia University, New York, NY 10027, USA.
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23
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Roach BL, Kelmendi-Doko A, Balutis EC, Marra KG, Ateshian GA, Hung CT. Dexamethasone Release from Within Engineered Cartilage as a Chondroprotective Strategy Against Interleukin-1α. Tissue Eng Part A 2016; 22:621-32. [PMID: 26956216 DOI: 10.1089/ten.tea.2016.0018] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
While significant progress has been made toward engineering functional cartilage constructs with mechanical properties suitable for in vivo loading, the impact on these grafts of inflammatory cytokines, chemical factors that are elevated with trauma or osteoarthritis, is poorly understood. Previous work has shown dexamethasone to be a critical compound for cultivating cartilage with functional properties, while also providing chondroprotection from proinflammatory cytokines. This study tested the hypothesis that the incorporation of poly(lactic-co-glycolic acid) (PLGA) (75:25) microspheres that release dexamethasone from within chondrocyte-seeded agarose hydrogel constructs would promote development of constructs with functional properties and protect constructs from the deleterious effects of interleukin-1α (IL-1α). After 28 days of growth culture, experimental groups were treated with IL-1α (10 ng/mL) for 7 days. Reaching native equilibrium moduli and proteoglycan levels, dexamethasone-loaded microsphere constructs exhibited tissue properties similar to microsphere-free control constructs cultured in dexamethasone-supplemented culture media and were insensitive to IL-1α exposure. These findings are in stark contrast to constructs containing dexamethasone-free microspheres or no microspheres, cultured without dexamethasone, where IL-1α exposure led to significant tissue degradation. These results support the use of dexamethasone delivery from within engineered cartilage, through biodegradable microspheres, as a strategy to produce mechanically functional tissues that can also combat the deleterious effects of local proinflammatory cytokine exposure.
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Affiliation(s)
- Brendan L Roach
- 1 Department of Biomedical Engineering, Columbia University , New York, New York
| | - Arta Kelmendi-Doko
- 2 Department of Bioengineering, University of Pittsburgh , Pittsburgh, Pennsylvania
| | - Elaine C Balutis
- 3 Department of Orthopedics and Sports Medicine, Mount Sinai Health System , New York, New York
| | - Kacey G Marra
- 2 Department of Bioengineering, University of Pittsburgh , Pittsburgh, Pennsylvania.,4 McGowan Institute for Regenerative Medicine, University of Pittsburgh , Pittsburgh, Pennsylvania.,5 Department of Plastic Surgery, University of Pittsburgh , Pittsburgh, Pennsylvania
| | - Gerard A Ateshian
- 1 Department of Biomedical Engineering, Columbia University , New York, New York.,6 Department of Mechanical Engineering, Columbia University , New York, New York
| | - Clark T Hung
- 1 Department of Biomedical Engineering, Columbia University , New York, New York
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24
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Cook CA, Huri PY, Ginn BP, Gilbert-Honick J, Somers SM, Temple JP, Mao HQ, Grayson WL. Characterization of a novel bioreactor system for 3D cellular mechanobiology studies. Biotechnol Bioeng 2016; 113:1825-37. [PMID: 26825810 DOI: 10.1002/bit.25946] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 01/20/2016] [Accepted: 01/25/2016] [Indexed: 11/12/2022]
Abstract
In vitro engineering systems can be powerful tools for studying tissue development in response to biophysical stimuli as well as for evaluating the functionality of engineered tissue grafts. It has been challenging, however, to develop systems that adequately integrate the application of biomimetic mechanical strain to engineered tissue with the ability to assess functional outcomes in real time. The aim of this study was to design a bioreactor system capable of real-time conditioning (dynamic, uniaxial strain, and electrical stimulation) of centimeter-long 3D tissue engineered constructs simultaneously with the capacity to monitor local strains. The system addresses key limitations of uniform sample loading and real-time imaging capabilities. Our system features an electrospun fibrin scaffold, which exhibits physiologically relevant stiffness and uniaxial alignment that facilitates cell adhesion, alignment, and proliferation. We have demonstrated the capacity for directly incorporating human adipose-derived stromal/stem cells into the fibers during the electrospinning process and subsequent culture of the cell-seeded constructs in the bioreactor. The bioreactor facilitates accurate pre-straining of the 3D constructs as well as the application of dynamic and static uniaxial strains while monitoring bulk construct tensions. The incorporation of fluorescent nanoparticles throughout the scaffolds enables in situ monitoring of local strain fields using fluorescent digital image correlation techniques, since the bioreactor is imaging compatible, and allows the assessment of local sample stiffness and stresses when coupled with force sensor measurements. In addition, the system is capable of measuring the electromechanical coupling of skeletal muscle explants by applying an electrical stimulus and simultaneously measuring the force of contraction. The packaging of these technologies, biomaterials, and analytical methods into a single bioreactor system has produced a powerful tool that will enable improved engineering of functional 3D ligaments, tendons, and skeletal muscles. Biotechnol. Bioeng. 2016;113: 1825-1837. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Colin A Cook
- Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, 400 N. Broadway, Smith 5023, Baltimore, Maryland, 21287.,Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Pinar Y Huri
- Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, 400 N. Broadway, Smith 5023, Baltimore, Maryland, 21287.,Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland.,Department of Biomedical Engineering, Ankara University Faculty of Engineering, Ankara, Turkey
| | - Brian P Ginn
- Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, 400 N. Broadway, Smith 5023, Baltimore, Maryland, 21287.,Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland
| | - Jordana Gilbert-Honick
- Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, 400 N. Broadway, Smith 5023, Baltimore, Maryland, 21287.,Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Sarah M Somers
- Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, 400 N. Broadway, Smith 5023, Baltimore, Maryland, 21287.,Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Joshua P Temple
- Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, 400 N. Broadway, Smith 5023, Baltimore, Maryland, 21287
| | - Hai-Quan Mao
- Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, 400 N. Broadway, Smith 5023, Baltimore, Maryland, 21287.,Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland.,Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland.,Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, Maryland
| | - Warren L Grayson
- Translational Tissue Engineering Center, Johns Hopkins University School of Medicine, 400 N. Broadway, Smith 5023, Baltimore, Maryland, 21287. .,Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland. .,Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland. .,Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, Maryland.
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25
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Nover AB, Jones BK, Yu WT, Donovan DS, Podolnick JD, Cook JL, Ateshian GA, Hung CT. A puzzle assembly strategy for fabrication of large engineered cartilage tissue constructs. J Biomech 2016; 49:668-677. [PMID: 26895780 DOI: 10.1016/j.jbiomech.2016.01.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2015] [Revised: 01/22/2016] [Accepted: 01/28/2016] [Indexed: 11/15/2022]
Abstract
Engineering of large articular cartilage tissue constructs remains a challenge as tissue growth is limited by nutrient diffusion. Here, a novel strategy is investigated, generating large constructs through the assembly of individually cultured, interlocking, smaller puzzle-shaped subunits. These constructs can be engineered consistently with more desirable mechanical and biochemical properties than larger constructs (~4-fold greater Young׳s modulus). A failure testing technique was developed to evaluate the physiologic functionality of constructs, which were cultured as individual subunits for 28 days, then assembled and cultured for an additional 21-35 days. Assembled puzzle constructs withstood large deformations (40-50% compressive strain) prior to failure. Their ability to withstand physiologic loads may be enhanced by increases in subunit strength and assembled culture time. A nude mouse model was utilized to show biocompatibility and fusion of assembled puzzle pieces in vivo. Overall, the technique offers a novel, effective approach to scaling up engineered tissues and may be combined with other techniques and/or applied to the engineering of other tissues. Future studies will aim to optimize this system in an effort to engineer and integrate robust subunits to fill large defects.
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Affiliation(s)
- Adam B Nover
- Department of Biomedical Engineering, Columbia University, 351 Engineering Terrace, 1210 Amsterdam Avenue, Mail Code: 8904, New York, NY 10027, USA.
| | - Brian K Jones
- Department of Mechanical Engineering, Columbia University, 242 S. W. Mudd, 500 West 120th Street, Mail Code: 4703, New York, NY 10027, USA.
| | - William T Yu
- Department of Biomedical Engineering, Columbia University, 351 Engineering Terrace, 1210 Amsterdam Avenue, Mail Code: 8904, New York, NY 10027, USA.
| | - Daniel S Donovan
- Department of Orthopedic Surgery, Mount Sinai West, 1000 Tenth Avenue, New York, NY 10019, USA; Department of Orthopedic Surgery, Mount Sinai St. Luke׳s, 1111 Amsterdam Avenue, New York, NY 10025, USA.
| | - Jeremy D Podolnick
- Department of Orthopedic Surgery, Mount Sinai West, 1000 Tenth Avenue, New York, NY 10019, USA; Department of Orthopedic Surgery, Mount Sinai St. Luke׳s, 1111 Amsterdam Avenue, New York, NY 10025, USA.
| | - James L Cook
- Department of Orthopaedic Surgery, University of Missouri, 1100 Virginia Avenue, DC953.000, Columbia, MO 65212, USA.
| | - Gerard A Ateshian
- Department of Biomedical Engineering, Columbia University, 351 Engineering Terrace, 1210 Amsterdam Avenue, Mail Code: 8904, New York, NY 10027, USA; Department of Mechanical Engineering, Columbia University, 242 S. W. Mudd, 500 West 120th Street, Mail Code: 4703, New York, NY 10027, USA.
| | - Clark T Hung
- Department of Biomedical Engineering, Columbia University, 351 Engineering Terrace, 1210 Amsterdam Avenue, Mail Code: 8904, New York, NY 10027, USA.
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Nover AB, Hou GY, Han Y, Wang S, O'Connell GD, Ateshian GA, Konofagou EE, Hung CT. High intensity focused ultrasound as a tool for tissue engineering: Application to cartilage. Med Eng Phys 2016; 38:192-8. [PMID: 26724968 DOI: 10.1016/j.medengphy.2015.11.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Revised: 11/09/2015] [Accepted: 11/24/2015] [Indexed: 11/17/2022]
Abstract
This article promotes the use of High Intensity Focused Ultrasound (HIFU) as a tool for affecting the local properties of tissue engineered constructs in vitro. HIFU is a low cost, non-invasive technique used for eliciting focal thermal elevations at variable depths within tissues. HIFU can be used to denature proteins within constructs, leading to decreased permeability and potentially increased local stiffness. Adverse cell viability effects remain restricted to the affected area. The methods described in this article are explored through the scope of articular cartilage tissue engineering and the fabrication of osteochondral constructs, but may be applied to the engineering of a variety of different tissues.
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Affiliation(s)
- Adam B Nover
- Department of Biomedical Engineering, Columbia University, 351 Engineering Terrace, 1210 Amsterdam Avenue, Mail Code: 8904, New York, NY 10027, USA.
| | - Gary Y Hou
- Department of Biomedical Engineering, Columbia University, 351 Engineering Terrace, 1210 Amsterdam Avenue, Mail Code: 8904, New York, NY 10027, USA.
| | - Yang Han
- Department of Biomedical Engineering, Columbia University, 351 Engineering Terrace, 1210 Amsterdam Avenue, Mail Code: 8904, New York, NY 10027, USA.
| | - Shutao Wang
- Department of Biomedical Engineering, Columbia University, 351 Engineering Terrace, 1210 Amsterdam Avenue, Mail Code: 8904, New York, NY 10027, USA.
| | - Grace D O'Connell
- Department of Mechanical Engineering, University of California, Berkeley, USA.
| | - Gerard A Ateshian
- Department of Biomedical Engineering, Columbia University, 351 Engineering Terrace, 1210 Amsterdam Avenue, Mail Code: 8904, New York, NY 10027, USA; Department of Mechanical Engineering, Columbia University, 242 S. W. Mudd, 500 West 120th Street, Mail Code: 4703, New York, NY 10027, USA.
| | - Elisa E Konofagou
- Department of Biomedical Engineering, Columbia University, 351 Engineering Terrace, 1210 Amsterdam Avenue, Mail Code: 8904, New York, NY 10027, USA; Department of Radiology, Columbia University, 630 W. 168th Street, P&S Box 28, New York, NY 10032, USA .
| | - Clark T Hung
- Department of Biomedical Engineering, Columbia University, 351 Engineering Terrace, 1210 Amsterdam Avenue, Mail Code: 8904, New York, NY 10027, USA.
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Nover AB, Stefani RM, Lee SL, Ateshian GA, Stoker AM, Cook JL, Hung CT. Long-term storage and preservation of tissue engineered articular cartilage. J Orthop Res 2016; 34:141-8. [PMID: 26296185 PMCID: PMC4710567 DOI: 10.1002/jor.23034] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Accepted: 08/18/2015] [Indexed: 02/04/2023]
Abstract
With limited availability of osteochondral allografts, tissue engineered cartilage grafts may provide an alternative treatment for large cartilage defects. An effective storage protocol will be critical for translating this technology to clinical use. The purpose of this study was to evaluate the efficacy of the Missouri Osteochondral Allograft Preservation System (MOPS) for room temperature storage of mature tissue engineered grafts, focusing on tissue property maintenance during the current allograft storage window (28 days). Additional research compares MOPS to continued culture, investigates temperature influence, and examines longer-term storage. Articular cartilage constructs were cultured to maturity using adult canine chondrocytes, then preserved with MOPS at room temperature, in refrigeration, or kept in culture for an additional 56 days. MOPS storage maintained desired chondrocyte viability for 28 days of room temperature storage, retaining 75% of the maturity point Young's modulus without significant decline in biochemical content. Properties dropped past this time point. Refrigeration maintained properties similar to room temperature at 28 days, but proved better at 56 days. For engineered grafts, MOPS maintained the majority of tissue properties for the 28-day window without clearly extending that period as it had for native grafts. These results are the first evaluating engineered cartilage storage.
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Affiliation(s)
- Adam B. Nover
- Department of Biomedical Engineering, Columbia University, 351 Engineering Terrace, 1210 Amsterdam Avenue, Mail Code: 8904, New York, New York 10027
| | - Robert M. Stefani
- Department of Biomedical Engineering, Columbia University, 351 Engineering Terrace, 1210 Amsterdam Avenue, Mail Code: 8904, New York, New York 10027
| | - Stephanie L. Lee
- Department of Biomedical Engineering, Columbia University, 351 Engineering Terrace, 1210 Amsterdam Avenue, Mail Code: 8904, New York, New York 10027
| | - Gerard A. Ateshian
- Department of Biomedical Engineering, Columbia University, 351 Engineering Terrace, 1210 Amsterdam Avenue, Mail Code: 8904, New York, New York 10027,Department of Mechanical Engineering, Columbia University, 242 S. W. Mudd, 500 West 120th Street, Mail Code: 4703, New York, New York 10027
| | - Aaron M. Stoker
- Department of Veterinary Medicine and Surgery, University of Missouri, 900 E Campus Dr., Columbia, Missouri 65211
| | - James L. Cook
- Department of Veterinary Medicine and Surgery, University of Missouri, 900 E Campus Dr., Columbia, Missouri 65211,Department of Orthopaedic Surgery, University of Missouri, 1100 Virginia Avenue, DC953.000, Columbia, Missouri 65212
| | - Clark T. Hung
- Department of Biomedical Engineering, Columbia University, 351 Engineering Terrace, 1210 Amsterdam Avenue, Mail Code: 8904, New York, New York 10027
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Han KS, Song JE, Tripathy N, Kim H, Moon BM, Park CH, Khang G. Effect of pore sizes of silk scaffolds for cartilage tissue engineering. Macromol Res 2015. [DOI: 10.1007/s13233-015-3156-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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29
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Porous titanium bases for osteochondral tissue engineering. Acta Biomater 2015; 27:286-293. [PMID: 26320541 DOI: 10.1016/j.actbio.2015.08.045] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Revised: 08/15/2015] [Accepted: 08/26/2015] [Indexed: 11/20/2022]
Abstract
Tissue engineering of osteochondral grafts may offer a cell-based alternative to native allografts, which are in short supply. Previous studies promote the fabrication of grafts consisting of a viable cell-seeded hydrogel integrated atop a porous, bone-like metal. Advantages of the manufacturing process have led to the evaluation of porous titanium as the bone-like base material. Here, porous titanium was shown to support the growth of cartilage to produce native levels of Young's modulus, using a clinically relevant cell source. Mechanical and biochemical properties were similar or higher for the osteochondral constructs compared to chondral-only controls. Further investigation into the mechanical influence of the base on the composite material suggests that underlying pores may decrease interstitial fluid pressurization and applied strains, which may be overcome by alterations to the base structure. Future studies aim to optimize titanium-based tissue engineered osteochondral constructs to best match the structural architecture and strength of native grafts. STATEMENT OF SIGNIFICANCE The studies described in this manuscript follow up on previous studies from our lab pertaining to the fabrication of osteochondral grafts that consist of a bone-like porous metal and a chondrocyte-seeded hydrogel. Here, tissue engineered osteochondral grafts were cultured to native stiffness using adult chondrocytes, a clinically relevant cell source, and a porous titanium base, a material currently used in clinical implants. This porous titanium is manufactured via selective laser melting, offering the advantages of precise control over shape, pore size, and orientation. Additionally, this manuscript describes the mechanical influence of the porous base, which may have applicability to porous bases derived from other materials.
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30
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O'Connell GD, Tan AR, Cui V, Bulinski JC, Cook JL, Attur M, Abramson SB, Ateshian GA, Hung CT. Human chondrocyte migration behaviour to guide the development of engineered cartilage. J Tissue Eng Regen Med 2015; 11:877-886. [PMID: 25627968 DOI: 10.1002/term.1988] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2014] [Revised: 10/24/2014] [Accepted: 12/09/2014] [Indexed: 01/01/2023]
Abstract
Tissue-engineering techniques have been successful in developing cartilage-like tissues in vitro using cells from animal sources. The successful translation of these strategies to the clinic will likely require cell expansion to achieve sufficient cell numbers. Using a two-dimensional (2D) cell migration assay to first identify the passage at which chondrocytes exhibited their greatest chondrogenic potential, the objective of this study was to determine a more optimal culture medium for developing three-dimensional (3D) cartilage-like tissues using human cells. We evaluated combinations of commonly used growth factors that have been shown to promote chondrogenic growth and development. Human articular chondrocytes (AC) from osteoarthritic (OA) joints were cultured in 3D environments, either in pellets or encapsulated in agarose. The effect of growth factor supplementation was dependent on the environment, such that matrix deposition differed between the two culture systems. ACs in pellet culture were more responsive to bone morphogenetic protein (BMP2) alone or combinations containing BMP2 (i.e. BMP2 with PDGF or FGF). However, engineered cartilage development within agarose was better for constructs cultured with TGFβ3. These results with agarose and pellet culture studies set the stage for the development of conditions appropriate for culturing 3D functional engineered cartilage for eventual use in human therapies. Copyright © 2015 John Wiley & Sons, Ltd.
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Affiliation(s)
- Grace D O'Connell
- Department of Mechanical Engineering, University of California, Berkeley, CA, USA
| | - Andrea R Tan
- Department of Biomedical Engineering, Columbia University, New York, NY, USA
| | - Victoria Cui
- Department of Biological Sciences, Columbia University, New York, NY, USA
| | - J Chloe Bulinski
- Department of Biological Sciences, Columbia University, New York, NY, USA
| | - James L Cook
- Missouri Orthopedic Institute, University of Missouri, Columbia, MO, USA
| | - Mukundan Attur
- Department of Medicine, New York University School of Medicine, and NYU Langone Medical Center, New York, NY, USA
| | - Steven B Abramson
- Department of Medicine, New York University School of Medicine, and NYU Langone Medical Center, New York, NY, USA
| | - Gerard A Ateshian
- Department of Biomedical Engineering, Columbia University, New York, NY, USA.,Department of Mechanical Engineering, Columbia University, New York, NY, USA
| | - Clark T Hung
- Department of Biomedical Engineering, Columbia University, New York, NY, USA
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O’Connell G, Nims R, Green J, Cigan A, Ateshian G, Hung C. Time and dose-dependent effects of chondroitinase ABC on growth of engineered cartilage. Eur Cell Mater 2014; 27:312-20. [PMID: 24760578 PMCID: PMC4096549 DOI: 10.22203/ecm.v027a22] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Tissue engineering techniques have been effective in developing cartilage-like tissues in vitro. However, many scaffold-based approaches to cultivating engineered cartilage have been limited by low collagen production, an impediment for attaining native functional load-bearing tensile mechanical properties. Enzymatic digestion of glycosaminoglycans (GAG) with chondroitinase ABC (chABC) temporarily suppresses the construct's GAG content and compressive modulus and increases collagen content. Based on the promising results of these early studies, the aim of this study was to further promote collagen deposition through more frequent chABC treatments. Weekly dosing of chABC at a concentration of 0.15 U/mL resulted in a significant cell death, which impacted the ability of the engineered cartilage to fully recover GAG and compressive mechanical properties. In light of these findings, the influence of lower chABC dosage on engineered tissue (0.004 and 0.015 U/mL) over a longer duration (one week) was investigated. Treatment with 0.004 U/mL reduced cell death, decreased the recovery time needed to achieve native compressive mechanical properties and GAG content, and resulted in a collagen content that was 65 % greater than the control. In conclusion, the results of this study demonstrate that longer chABC treatment (one week) at low concentrations can be used to improve collagen content in developing engineered cartilage more expediently than standard chABC treatments of higher chABC doses administered over brief durations.
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Affiliation(s)
- G.D. O’Connell
- Department of Mechanical Engineering, University of California, Berkeley, CA, USA
| | - R.J. Nims
- Department of Biomedical Engineering, Columbia University, New York, NY, USA
| | - J. Green
- Department of Orthopaedic Surgery, St Luke’s Roosevelt Hospital Center, New York, NY, USA
| | - A.D. Cigan
- Department of Biomedical Engineering, Columbia University, New York, NY, USA
| | - G.A. Ateshian
- Department of Biomedical Engineering, Columbia University, New York, NY, USA
| | - C.T. Hung
- Department of Biomedical Engineering, Columbia University, New York, NY, USA,Address for correspondence: Clark T. Hung, Ph.D. Columbia University, Biomedical Engineering Department, 351 Engineering Terrace, New York, NY 10027, USA, Telephone Number: 212-854-6542, FAX Number: 212-854-8725,
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