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Wang T, Dogru S, Dai Z, Kim SY, Vickers N, Albro MB. Physiologic Doses of TGF-β Improve the Composition of Engineered Articular Cartilage. Tissue Eng Part A 2024. [PMID: 38874527 DOI: 10.1089/ten.tea.2023.0360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2024] Open
Abstract
Conventionally, for cartilage tissue engineering applications, TGF-β is administered at doses that are several orders of magnitude higher than those present during native cartilage development. While these doses accelerate extracellular matrix (ECM) biosynthesis, they may also contribute to features detrimental to hyaline cartilage function, including tissue swelling, type-I collagen (COL-I) deposition, cellular hypertrophy, and cellular hyperplasia. In contrast, during native cartilage development, chondrocytes are exposed to moderate TGF-β levels, which serve to promote strong biosynthetic enhancements while mitigating risks of pathology associated with TGF-β excesses. Here, we examine the hypothesis that physiologic doses of TGF-β can yield neocartilage with a more hyaline-cartilage-like composition and structure relative to conventionally-administered supraphysiologic doses. This hypothesis was examined on a model system of reduced-size constructs (Ø2×2mm or Ø3×2mm) comprised of bovine chondrocytes encapsulated in agarose, which exhibit mitigated TGF-β spatial gradients allowing for an evaluation of the intrinsic effect of TGF-β doses on tissue development. Reduced-size (Ø2×2mm or Ø3×2mm) and conventional-size constructs (Ø4-Ø6mm×2mm) were subjected to a range of physiologic (0.1, 0.3, 1ng/mL) and supraphysiologic (3, 10ng/mL) TGF-β doses. At day 56, the physiologic 0.3ng/mL dose yielded reduced-size constructs with native-cartilage-matched Young's modulus (EY) (630±58kPa) and sulfated GAG (sGAG) content (5.9±0.6%) while significantly increasing the sGAG-to-collagen ratio, leading to significantly reduced tissue swelling relative to constructs exposed to the supraphysiologic 10ng/mL TGF-β dose. Further, reduced-size constructs exposed to the 0.3ng/mL dose exhibited a significant reduction in fibrocartilage-associated COL-I and a 77% reduction in the fraction of chondrocytes present in a clustered morphology, relative to the supraphysiologic 10ng/mL dose (p<0.001). EY was significantly lower for conventional-size constructs exposed to physiologic doses due to TGF-β transport limitations in these larger tissues (p<0.001). Overall, physiologic TGF-β appears to achieve an important balance of promoting requisite ECM biosynthesis, while mitigating features detrimental to hyaline cartilage function. While reduced-size constructs are not suitable for the repair of clinical-size cartilage lesions, insights from this work can inform TGF-β dosing requirements for emerging scaffold-release or nutrient-channel delivery platforms capable of achieving uniform delivery of physiologic TGF-β doses to larger constructs required for clinical cartilage repair.
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Affiliation(s)
- Tianbai Wang
- Boston University, Materials Science & Engineering, boston, Massachusetts, United States;
| | - Sedat Dogru
- Boston University, Mechanical Engineering, boston, Massachusetts, United States;
| | - Zhonghao Dai
- Boston University, Biomedical Engineering, boston, Massachusetts, United States;
| | - Sung Yeon Kim
- Boston University, Biomedical Engineering, boston, Massachusetts, United States;
| | - Nicholas Vickers
- Boston University, Mechanical Engineering, boston, Massachusetts, United States;
| | - Michael B Albro
- Boston University, Mechanical Engineering, 110 Cummington Mall, room 101, boston, Massachusetts, United States, 02215;
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2
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Zielinska D, Fisch P, Moehrlen U, Finkielsztein S, Linder T, Zenobi-Wong M, Biedermann T, Klar AS. Combining bioengineered human skin with bioprinted cartilage for ear reconstruction. SCIENCE ADVANCES 2023; 9:eadh1890. [PMID: 37792948 PMCID: PMC10550230 DOI: 10.1126/sciadv.adh1890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Accepted: 09/01/2023] [Indexed: 10/06/2023]
Abstract
Microtia is a congenital disorder that manifests as a malformation of the external ear leading to psychosocial problems in affected children. Here, we present a tissue-engineered treatment approach based on a bioprinted autologous auricular cartilage construct (EarCartilage) combined with a bioengineered human pigmented and prevascularized dermo-epidermal skin substitute (EarSkin) tested in immunocompromised rats. We confirmed that human-engineered blood capillaries of EarSkin connected to the recipient's vasculature within 1 week, enabling rapid blood perfusion and epidermal maturation. Bioengineered EarSkin displayed a stratified epidermis containing mature keratinocytes and melanocytes. The latter resided within the basal layer of the epidermis and efficiently restored the skin color. Further, in vivo tests demonstrated favorable mechanical stability of EarCartilage along with enhanced extracellular matrix deposition. In conclusion, EarCartilage combined with EarSkin represents a novel approach for the treatment of microtia with the potential to circumvent existing limitations and improve the aesthetic outcome of microtia reconstruction.
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Affiliation(s)
- Dominika Zielinska
- Tissue Biology Research Unit, University Children’s Hospital Zurich, University of Zurich, Zurich, Switzerland
- Children’s Research Center, University Children’s Hospital Zurich, Zurich, Switzerland
- University of Zurich, Zurich, Switzerland
| | - Philipp Fisch
- Tissue Engineering and Biofabrication Laboratory, Department of Health Sciences and Technology, ETH Zurich, Switzerland
| | - Ueli Moehrlen
- Tissue Biology Research Unit, University Children’s Hospital Zurich, University of Zurich, Zurich, Switzerland
- Children’s Research Center, University Children’s Hospital Zurich, Zurich, Switzerland
- University of Zurich, Zurich, Switzerland
| | | | - Thomas Linder
- Klinik für Hals-, Nasen-, Ohren- und Gesichtschirurgie, Luzerner Kantonsspital, Luzern, Switzerland
| | - Marcy Zenobi-Wong
- Tissue Engineering and Biofabrication Laboratory, Department of Health Sciences and Technology, ETH Zurich, Switzerland
| | - Thomas Biedermann
- Tissue Biology Research Unit, University Children’s Hospital Zurich, University of Zurich, Zurich, Switzerland
- Children’s Research Center, University Children’s Hospital Zurich, Zurich, Switzerland
- University of Zurich, Zurich, Switzerland
| | - Agnes S. Klar
- Tissue Biology Research Unit, University Children’s Hospital Zurich, University of Zurich, Zurich, Switzerland
- Children’s Research Center, University Children’s Hospital Zurich, Zurich, Switzerland
- University of Zurich, Zurich, Switzerland
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3
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Wang T, Dogru S, Dai Z, Kim SY, Vickers NA, Albro MB. Physiologic Doses of TGF-β Improve the Composition of Engineered Articular Cartilage. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.27.559554. [PMID: 37808691 PMCID: PMC10557735 DOI: 10.1101/2023.09.27.559554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/10/2023]
Abstract
For cartilage regeneration applications, transforming growth factor beta (TGF-β) is conventionally administered at highly supraphysiologic doses (10-10,000 ng/mL) in an attempt to cue cells to fabricate neocartilage that matches the composition, structure, and functional properties of native hyaline cartilage. While supraphysiologic doses enhance ECM biosynthesis, they are also associated with inducing detrimental tissue features, such as fibrocartilage matrix deposition, pathologic-like chondrocyte clustering, and tissue swelling. Here we investigate the hypothesis that moderated TGF-β doses (0.1-1 ng/mL), akin to those present during physiological cartilage development, can improve neocartilage composition. Variable doses of media-supplemented TGF-β were administered to a model system of reduced-size cylindrical constructs (Ø2-Ø3 mm), which mitigate the TGF-β spatial gradients observed in conventional-size constructs (Ø4-Ø6 mm), allowing for a novel assessment of the intrinsic effect of TGF-β doses on macroscale neocartilage properties and composition. The administration of physiologic TGF-β to reduced-size constructs yields neocartilage with native-matched sGAG content and mechanical properties while providing a more hyaline cartilage-like composition, marked by: 1) reduced fibrocartilage-associated type I collagen, 2) 77% reduction in the fraction of cells present in a clustered morphology, and 3) 45% reduction in the degree of tissue swelling. Physiologic TGF-β appears to achieve an important balance of promoting requisite ECM biosynthesis, while mitigating hyaline cartilage compositional deficits. These results can guide the development of novel physiologic TGF-β-delivering scaffolds to improve the regeneration clinical-sized neocartilage tissues.
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Nims RJ, Pferdehirt L, Ho NB, Savadipour A, Lorentz J, Sohi S, Kassab J, Ross AK, O'Conor CJ, Liedtke WB, Zhang B, McNulty AL, Guilak F. A synthetic mechanogenetic gene circuit for autonomous drug delivery in engineered tissues. SCIENCE ADVANCES 2021; 7:eabd9858. [PMID: 33571125 PMCID: PMC7840132 DOI: 10.1126/sciadv.abd9858] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 12/08/2020] [Indexed: 05/12/2023]
Abstract
Mechanobiologic signals regulate cellular responses under physiologic and pathologic conditions. Using synthetic biology and tissue engineering, we developed a mechanically responsive bioartificial tissue that responds to mechanical loading to produce a preprogrammed therapeutic biologic drug. By deconstructing the signaling networks induced by activation of the mechanically sensitive ion channel transient receptor potential vanilloid 4 (TRPV4), we created synthetic TRPV4-responsive genetic circuits in chondrocytes. We engineered these cells into living tissues that respond to mechanical loading by producing the anti-inflammatory biologic drug interleukin-1 receptor antagonist. Chondrocyte TRPV4 is activated by osmotic loading and not by direct cellular deformation, suggesting that tissue loading is transduced into an osmotic signal that activates TRPV4. Either osmotic or mechanical loading of tissues transduced with TRPV4-responsive circuits protected constructs from inflammatory degradation by interleukin-1α. This synthetic mechanobiology approach was used to develop a mechanogenetic system to enable long-term, autonomously regulated drug delivery driven by physiologically relevant loading.
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Affiliation(s)
- Robert J Nims
- Department of Orthopedic Surgery, Washington University School of Medicine, St. Louis, MO 63110, USA
- Shriners Hospitals for Children-Saint Louis, St. Louis, MO 63110, USA
- Center of Regenerative Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Lara Pferdehirt
- Department of Orthopedic Surgery, Washington University School of Medicine, St. Louis, MO 63110, USA
- Shriners Hospitals for Children-Saint Louis, St. Louis, MO 63110, USA
- Center of Regenerative Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
- Department of Biomedical Engineering, Washington University, St. Louis, MO 63105, USA
| | - Noelani B Ho
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, NC 27710, USA
- Department of Biology, Duke University, Durham, NC 27708, USA
| | - Alireza Savadipour
- Department of Orthopedic Surgery, Washington University School of Medicine, St. Louis, MO 63110, USA
- Shriners Hospitals for Children-Saint Louis, St. Louis, MO 63110, USA
- Center of Regenerative Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
- Department of Mechanical Engineering and Materials Science, Washington University, St. Louis, MO 63105, USA
| | - Jeremiah Lorentz
- Department of Orthopedic Surgery, Washington University School of Medicine, St. Louis, MO 63110, USA
- Shriners Hospitals for Children-Saint Louis, St. Louis, MO 63110, USA
- Center of Regenerative Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
- Department of Biomedical Engineering, Washington University, St. Louis, MO 63105, USA
| | - Sima Sohi
- Department of Biomedical Engineering, Washington University, St. Louis, MO 63105, USA
| | - Jordan Kassab
- Department of Biomedical Engineering, Washington University, St. Louis, MO 63105, USA
| | - Alison K Ross
- Department of Orthopedic Surgery, Washington University School of Medicine, St. Louis, MO 63110, USA
- Shriners Hospitals for Children-Saint Louis, St. Louis, MO 63110, USA
- Center of Regenerative Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
- Department of Biomedical Engineering, Washington University, St. Louis, MO 63105, USA
| | - Christopher J O'Conor
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Wolfgang B Liedtke
- Department of Neurology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Bo Zhang
- Center of Regenerative Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Amy L McNulty
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, NC 27710, USA
- Department of Pathology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Farshid Guilak
- Department of Orthopedic Surgery, Washington University School of Medicine, St. Louis, MO 63110, USA.
- Shriners Hospitals for Children-Saint Louis, St. Louis, MO 63110, USA
- Center of Regenerative Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
- Department of Biomedical Engineering, Washington University, St. Louis, MO 63105, USA
- Department of Mechanical Engineering and Materials Science, Washington University, St. Louis, MO 63105, USA
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Middendorf JM, Dugopolski C, Kennedy S, Blahut E, Cohen I, Bonassar LJ. Heterogeneous matrix deposition in human tissue engineered cartilage changes the local shear modulus and resistance to local construct buckling. J Biomech 2020; 105:109760. [PMID: 32276782 DOI: 10.1016/j.jbiomech.2020.109760] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 02/05/2020] [Accepted: 03/20/2020] [Indexed: 12/11/2022]
Abstract
Human tissue engineered cartilage is a promising solution for focal cartilage defects, but these constructs do not have the same local mechanical properties as native tissue. Most clinically relevant engineered cartilage constructs seed human chondrocytes onto a collagen scaffold, which buckles at low loads and strains. This buckling creates local regions of high strain that could cause cell death and damage the engineered tissue. Since human tissue engineered cartilage is commonly grown in-vivo prior to implantation, new matrix deposition could improve the local implant mechanics and prevent local tissue buckling. However, the relationship between local biochemical composition and the local mechanics or local buckling probability has never been quantified. Therefore, this study correlated the local biochemical composition of human tissue engineered cartilage constructs using Fourier transform infrared spectroscopy (FTIR) with the local shear modulus and local buckling probability. The local shear modulus and local buckling probability were obtained using a confocal elastography technique. The local shear modulus increased with increases in local aggrecan content in the interior region (inside the scaffold). A minimum amount of aggrecan was required to prevent local construct buckling at physiologic strains. Since the original scaffold was primarily composed of collagen, increases in collagen content due to new matrix deposition was minimal and had little effect on the mechanical properties. Thus, we concluded that aggrecan deposition inside the scaffold pores is the most effective way to improve the mechanical function and prevent local tissue damage in human tissue engineered cartilage constructs.
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Affiliation(s)
- Jill M Middendorf
- Sibley School of Mechanical Engineering, Cornell University, Ithaca, NY, USA
| | | | | | | | - Itai Cohen
- Physics, Cornell University, Ithaca, NY, USA
| | - Lawrence J Bonassar
- Sibley School of Mechanical Engineering, Cornell University, Ithaca, NY, USA; Meinig School of Biomedical Engineering Cornell University, Ithaca, NY, USA.
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6
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Bonnevie ED, Bonassar LJ. A Century of Cartilage Tribology Research Is Informing Lubrication Therapies. J Biomech Eng 2020; 142:1072682. [DOI: 10.1115/1.4046045] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Indexed: 11/08/2022]
Abstract
AbstractArticular cartilage is one of the most unique materials found in nature. This tissue's ability to provide low friction and low wear over decades of constant use is not surpassed, as of yet, by any synthetic materials. Lubrication of the body's joints is essential to mammalian locomotion, but breakdown and degeneration of cartilage is the leading cause of severe disability in the industrialized world. In this paper, we review how theories of cartilage lubrication have evolved over the past decades and connect how theories of cartilage lubrication have been translated to lubrication-based therapies. Here, we call upon these historical perspectives and highlight the open questions in cartilage lubrication research. Additionally, these open questions within the field's understanding of natural lubrication mechanisms reveal strategic directions for lubrication therapy.
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Affiliation(s)
- Edward D. Bonnevie
- Sibley School of Mechanical and Aerospace Engineering, Cornell University, 151 Weill Hall, 526 Campus Road, Ithaca, NY 14850
| | - Lawrence J. Bonassar
- Sibley School of Mechanical and Aerospace Engineering, Cornell University, 151 Weill Hall, 526 Campus Road, Ithaca, NY 14850; Meinig School of Biomedical Engineering, Cornell University, 151 Weill Hall, 526 Campus Road, Ithaca, NY 14850
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7
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Takada E, Mizuno S. Reproduction of Characteristics of Extracellular Matrices in Specific Longitudinal Depth Zone Cartilage within Spherical Organoids in Response to Changes in Osmotic Pressure. Int J Mol Sci 2018; 19:ijms19051507. [PMID: 29783650 PMCID: PMC5983583 DOI: 10.3390/ijms19051507] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Revised: 05/12/2018] [Accepted: 05/15/2018] [Indexed: 12/17/2022] Open
Abstract
Articular cartilage is compressed with joint-loading and weight-bearing stresses, followed by a bulging of the tissue during times of off-loading. This loading and off-loading causes changes in water content, and thus alterations in osmotic pressure. Another unique characteristic of articular cartilage is that it has longitudinal depth: surface, middle, and deep zones. Since each zone is composed of unique components of highly negative extracellular matrices, each zone has a different level of osmotic pressure. It was unclear how changes in osmotic pressure affected chondrocyte matrix turnover in specific longitudinal zones. Therefore, we hypothesized that a change in extrinsic osmotic pressure would alter the production of extracellular matrices by zone-specific chondrocytes. We incubated spheroidal cartilage organoids, formed by specific longitudinal depth zone-derived chondrocytes, under different levels of osmotic pressure. We compared the gene expression and the immunohistology of the matrix proteins produced by the zone-specific chondrocytes. We found that high osmotic pressure significantly upregulated the transient expression of aggrecan and collagen type-II by all zone-derived chondrocytes (p < 0.05). At a high osmotic pressure, surface-zone chondrocytes significantly upregulated the expression of collagen type-I (p < 0.05), and middle- and deep-zone chondrocytes significantly upregulated matrix metalloproteinase-13 (p < 0.05). The spheroids, once exposed to high osmotic pressure, accumulated extracellular matrices with empty spaces. Our findings show that chondrocytes have zone-specific turnover of extracellular matrices in response to changes in osmotic pressure.
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Affiliation(s)
- Eiichiro Takada
- Department of Orthopedic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.
| | - Shuichi Mizuno
- Department of Orthopedic Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.
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8
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Ford AC, Chui WF, Zeng AY, Nandy A, Liebenberg E, Carraro C, Kazakia G, Alliston T, O'Connell GD. A modular approach to creating large engineered cartilage surfaces. J Biomech 2018; 67:177-183. [PMID: 29273221 PMCID: PMC5767151 DOI: 10.1016/j.jbiomech.2017.11.035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2017] [Revised: 11/26/2017] [Accepted: 11/28/2017] [Indexed: 12/20/2022]
Abstract
Native articular cartilage has limited capacity to repair itself from focal defects or osteoarthritis. Tissue engineering has provided a promising biological treatment strategy that is currently being evaluated in clinical trials. However, current approaches in translating these techniques to developing large engineered tissues remains a significant challenge. In this study, we present a method for developing large-scale engineered cartilage surfaces through modular fabrication. Modular Engineered Tissue Surfaces (METS) uses the well-known, but largely under-utilized self-adhesion properties of de novo tissue to create large scaffolds with nutrient channels. Compressive mechanical properties were evaluated throughout METS specimens, and the tensile mechanical strength of the bonds between attached constructs was evaluated over time. Raman spectroscopy, biochemical assays, and histology were performed to investigate matrix distribution. Results showed that by Day 14, stable connections had formed between the constructs in the METS samples. By Day 21, bonds were robust enough to form a rigid sheet and continued to increase in size and strength over time. Compressive mechanical properties and glycosaminoglycan (GAG) content of METS and individual constructs increased significantly over time. The METS technique builds on established tissue engineering accomplishments of developing constructs with GAG composition and compressive properties approaching native cartilage. This study demonstrated that modular fabrication is a viable technique for creating large-scale engineered cartilage, which can be broadly applied to many tissue engineering applications and construct geometries.
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Affiliation(s)
- Audrey C Ford
- Department of Mechanical Engineering, University of California, Berkeley, United States
| | - Wan Fung Chui
- Department of Mechanical Engineering, University of California, Berkeley, United States
| | - Anne Y Zeng
- Department of Mechanical Engineering, University of California, Berkeley, United States
| | - Aditya Nandy
- Department of Mechanical Engineering, University of California, Berkeley, United States
| | - Ellen Liebenberg
- Department of Orthopaedic Surgery, University of California, San Francisco, United States
| | - Carlo Carraro
- Department of Chemical Engineering, University of California, Berkeley, United States
| | - Galateia Kazakia
- Department of Radiology, University of California, San Francisco, United States
| | - Tamara Alliston
- Department of Orthopaedic Surgery, University of California, San Francisco, United States
| | - Grace D O'Connell
- Department of Mechanical Engineering, University of California, Berkeley, United States.
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Abstract
Articular cartilage (AC) is a seemingly simple tissue that has only one type of constituting cell and no blood vessels and nerves. In the early days of tissue engineering, cartilage appeared to be an easy and promising target for reconstruction and this was especially motivating because of widespread AC pathologies such as osteoarthritis and frequent sports-induced injuries. However, AC has proven to be anything but simple. Recreating the varying properties of its zonal structure is a challenge that has not yet been fully answered. This caused the shift in tissue engineering strategies toward bioinspired or biomimetic approaches that attempt to mimic and simulate as much as possible the structure and function of the native tissues. Hydrogels, particularly gradient hydrogels, have shown great potential as components of the biomimetic engineering of the cartilaginous tissue.
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Affiliation(s)
- Ivana Gadjanski
- Belgrade Metropolitan University, Belgrade, Serbia
- BioSense Institute, University of Novi Sad, Novi Sad, Serbia
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10
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Gadjanski I. Recent advances on gradient hydrogels in biomimetic cartilage tissue engineering. F1000Res 2017; 6:F1000 Faculty Rev-2158. [PMID: 29333257 PMCID: PMC5749123 DOI: 10.12688/f1000research.12391.2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/27/2018] [Indexed: 12/20/2022] Open
Abstract
Articular cartilage (AC) is a seemingly simple tissue that has only one type of constituting cell and no blood vessels and nerves. In the early days of tissue engineering, cartilage appeared to be an easy and promising target for reconstruction and this was especially motivating because of widespread AC pathologies such as osteoarthritis and frequent sports-induced injuries. However, AC has proven to be anything but simple. Recreating the varying properties of its zonal structure is a challenge that has not yet been fully answered. This caused the shift in tissue engineering strategies toward bioinspired or biomimetic approaches that attempt to mimic and simulate as much as possible the structure and function of the native tissues. Hydrogels, particularly gradient hydrogels, have shown great potential as components of the biomimetic engineering of the cartilaginous tissue.
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Affiliation(s)
- Ivana Gadjanski
- Belgrade Metropolitan University, Belgrade, Serbia
- BioSense Institute, University of Novi Sad, Novi Sad, Serbia
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11
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You F, Eames BF, Chen X. Application of Extrusion-Based Hydrogel Bioprinting for Cartilage Tissue Engineering. Int J Mol Sci 2017; 18:E1597. [PMID: 28737701 PMCID: PMC5536084 DOI: 10.3390/ijms18071597] [Citation(s) in RCA: 89] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 07/10/2017] [Accepted: 07/16/2017] [Indexed: 01/29/2023] Open
Abstract
Extrusion-based bioprinting (EBB) is a rapidly developing technique that has made substantial progress in the fabrication of constructs for cartilage tissue engineering (CTE) over the past decade. With this technique, cell-laden hydrogels or bio-inks have been extruded onto printing stages, layer-by-layer, to form three-dimensional (3D) constructs with varying sizes, shapes, and resolutions. This paper reviews the cell sources and hydrogels that can be used for bio-ink formulations in CTE application. Additionally, this paper discusses the important properties of bio-inks to be applied in the EBB technique, including biocompatibility, printability, as well as mechanical properties. The printability of a bio-ink is associated with the formation of first layer, ink rheological properties, and crosslinking mechanisms. Further, this paper discusses two bioprinting approaches to build up cartilage constructs, i.e., self-supporting hydrogel bioprinting and hybrid bioprinting, along with their applications in fabricating chondral, osteochondral, and zonally organized cartilage regenerative constructs. Lastly, current limitations and future opportunities of EBB in printing cartilage regenerative constructs are reviewed.
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Affiliation(s)
- Fu You
- Division of Biomedical Engineering, College of Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK S7N5A9, Canada.
| | - B Frank Eames
- Division of Biomedical Engineering, College of Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK S7N5A9, Canada.
- Department of Anatomy and Cell Biology, College of Medicine, University of Saskatchewan, 107 Wiggins Road, Saskatoon, SK S7N 5E5, Canada.
| | - Xiongbiao Chen
- Division of Biomedical Engineering, College of Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK S7N5A9, Canada.
- Department of Mechanical Engineering, College of Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK S7N5A9, Canada.
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