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Shi Y, Liu J, Deng J, Cao L, Li L, Shao J, Li J, Xiong D. Tough Bonding of PVA Hydrogel-on-Textured Titanium Alloy with Varying Texture Densities in Swollen State. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:13773-13783. [PMID: 38920266 DOI: 10.1021/acs.langmuir.4c00120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/27/2024]
Abstract
Cartilage defects in large joints are a common occurrence in numerous degenerative diseases, especially in osteoarthritis. The hydrogel-on-metal composite has emerged as a potential candidate material, as hydrogels, to some extent, replicate the composition of human articular cartilage consisting of collagen fibers and proteoglycans. However, achieving tough bonding between the hydrogel and titanium alloy remains a significant challenge due to the swelling of the hydrogel in a liquid medium. This swelling results in reduced interfacial toughness between the hydrogel and titanium alloy, limiting its potential clinical applications. Herein, our approach aimed to achieve durable bonding between a hydrogel and a titanium alloy composite in a swollen state by modifying the surface texture of the titanium alloy. Various textures, including circular and triangular patterns, with dimple densities ranging from 10 to 40%, were created on the surface of the titanium alloy. Subsequently, poly(vinyl alcohol) (PVA) hydrogel was deposited onto the textured titanium alloy using a casting-drying method. Our findings revealed that PVA hydrogel on the textured titanium alloy with a 30% texture density exhibited the highest interfacial toughness in the swollen state, measuring at 1300 J m-2 after reaching equilibrium swelling in deionized water, which is a more than 2-fold increase compared to the hydrogel on a smooth substrate. Furthermore, we conducted an analysis of the morphologies of the detached hydrogel from the textured titanium alloy after various swelling durations. The results indicated that interfacial toughness could be enhanced through mechanical interlocking, facilitated by the expanded volume of the hydrogel protrusions as the swelling time increased. Collectively, our study demonstrates the feasibility of achieving tough bonding between a hydrogel and a metal substrate in a liquid environment. This research opens up promising avenues for designing soft/hard heterogeneous materials with strong adhesive properties.
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Affiliation(s)
- Yan Shi
- College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China
| | - Jia Liu
- College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China
| | - Jinhai Deng
- School of Cancer & Pharmaceutical Sciences, King's College London, London SE1 1UL, United Kingdom
| | - Lulu Cao
- Department of Rheumatology and Immunology, Peking University People's Hospital, Beijing 100044, China
| | - Long Li
- College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China
| | - Jiaojing Shao
- College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China
| | - Jianliang Li
- School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Dangsheng Xiong
- School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
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2
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Wang Z, Yang F, Liu X, Han X, Li X, Huyan C, Liu D, Chen F. Hydrogen Bonds-Pinned Entanglement Blunting the Interfacial Crack of Hydrogel-Elastomer Hybrids. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2313177. [PMID: 38272488 DOI: 10.1002/adma.202313177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 01/16/2024] [Indexed: 01/27/2024]
Abstract
Anchoring a layer of amorphous hydrogel on an antagonistic elastomer holds potential applications in surface aqueous lubrication. However, the interfacial crack propagation usually occurs under continuous loads for amorphous hydrogel, leading to the failure of hydrogel interface. This work presents a universal strategy to passivate the interfacial cracks by designing a hydrogen bonds-pinned entanglement (Hb-En) structure of amorphous hydrogel on engineering elastomers. The unique Hb-En structure is created by pinning well-tailored entanglements via covalent-like hydrogen bonds, which can amplify the delocalization of interfacial stress concentration and elevate the necessary fracture energy barrier within hydrogel interface. Therefore, the interfacial crack propagation can be suppressed under single and cyclic loads, resulting in a high interfacial toughness over 1650 J m-2 and an excellent interfacial fatigue threshold of 423 J m-2. Such a strategy universally works on blunting the interfacial crack between hydrogel coating and various elastomer materials with arbitrary shapes. The superb fatigue-crack insensitivity at the interface allows for durable aqueous lubrication of hydrogel coating with low friction.
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Affiliation(s)
- Zibi Wang
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi, 710049, China
| | - Fahu Yang
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi, 710049, China
| | - Xiaoxu Liu
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi, 710049, China
| | - Xiang Han
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi, 710049, China
| | - Xinxin Li
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi, 710049, China
| | - Chenxi Huyan
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi, 710049, China
| | - Dong Liu
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi, 710049, China
| | - Fei Chen
- School of Chemical Engineering and Technology, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an, Shaanxi, 710049, China
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3
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Monteiro LPG, Rodrigues JMM, Mano JF. In situ generated hemostatic adhesives: From mechanisms of action to recent advances and applications. BIOMATERIALS ADVANCES 2023; 155:213670. [PMID: 37952461 DOI: 10.1016/j.bioadv.2023.213670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 10/20/2023] [Accepted: 10/20/2023] [Indexed: 11/14/2023]
Abstract
Conventional surgical closure techniques, such as sutures, clips, or skin closure strips, may not always provide optimal wound closure and may require invasive procedures, which can result in potential post-surgical complications. As result, there is a growing demand for innovative solutions to achieve superior wound closure and improve patient outcomes. To overcome the abovementioned issues, in situ generated hemostatic adhesives/sealants have emerged as a promising alternative, offering a targeted, controllable, and minimally invasive procedure for a wide variety of medical applications. The aim of this review is to provide a comprehensive overview of the mechanisms of action and recent advances of in situ generated hemostatic adhesives, particularly protein-based, thermoresponsive, bioinspired, and photocrosslinkable formulations, as well as the design challenges that must be addressed. Overall, this review aims to enhance a comprehensive understanding of the latest advancements of in situ generated hemostatic adhesives and their mechanisms of action, with the objective of promoting further research in this field.
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Affiliation(s)
- Luís P G Monteiro
- Department of Chemistry, CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal
| | - João M M Rodrigues
- Department of Chemistry, CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - João F Mano
- Department of Chemistry, CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal.
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4
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Perkucin I, Lau KSK, Morshead CM, Naguib HE. Bio-inspired conductive adhesive based on calcium-free alginate hydrogels for bioelectronic interfaces. Biomed Mater 2022; 18. [PMID: 36537718 DOI: 10.1088/1748-605x/aca578] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Accepted: 11/23/2022] [Indexed: 11/25/2022]
Abstract
Electrode impedance is one of the greatest challenges facing neural interfacing medical devices and the use of electrical stimulation-based therapies in the fields of neurology and regenerative medicine. Maximizing contact between electronics and tissue would allow for more accurate recordings of neural activity and to stimulate with less power in implantable devices as electric signals could be more precisely transferred by a stable interfacial area. Neural environments, inherently wet and ion-rich, present a unique challenge for traditional conductive adhesives. As such, we look to marine mussels that use a 3,4-dihydroxyphenyl-L-analine (DOPA)-containing proteinaceous excretion to adhere to a variety of substrates for inspiration. By functionalizing alginate, which is an abundantly available natural polymer, with the catechol residues DOPA contains, we developed a hydrogel-based matrix to which carbon-based nanofiller was added to render it conductive. The synthesized product had adhesive energy within the range of previously reported mussel-based polymers, good electrical properties and was not cytotoxic to brain derived neural precursor cells.
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Affiliation(s)
- Ivana Perkucin
- Department of Chemical Engineering and Applied Sciences, University of Toronto, Toronto, Canada
| | - Kylie S K Lau
- Institute of Biomedical Engineering, University of Toronto, Toronto, Canada
| | - Cindi M Morshead
- Institute of Biomedical Engineering, University of Toronto, Toronto, Canada.,Department of Surgery, Division of Anatomy, University of Toronto, Toronto, Canada
| | - Hani E Naguib
- Institute of Biomedical Engineering, University of Toronto, Toronto, Canada.,Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Canada
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5
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Zhao Y, Cui J, Qiu X, Yan Y, Zhang Z, Fang K, Yang Y, Zhang X, Huang J. Manufacturing and post-engineering strategies of hydrogel actuators and sensors: From materials to interfaces. Adv Colloid Interface Sci 2022; 308:102749. [PMID: 36007285 DOI: 10.1016/j.cis.2022.102749] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 07/27/2022] [Accepted: 08/05/2022] [Indexed: 11/17/2022]
Abstract
Living bodies are made of numerous bio-sensors and actuators for perceiving external stimuli and making movement. Hydrogels have been considered as ideal candidates for manufacturing bio-sensors and actuators because of their excellent biocompatibility, similar mechanical and electrical properties to that of living organs. The key point of manufacturing hydrogel sensors/actuators is that the materials should not only possess excellent mechanical and electrical properties but also form effective interfacial connections with various substrates. Traditional hydrogel normally shows high electrical resistance (~ MΩ•cm) with limited mechanical strength (<1 MPa), and it is prone to fatigue fracture during continuous loading-unloading cycles. Just like iron should be toughened and hardened into steel, manufacturing and post-treatment processes are necessary for modifying hydrogels. Besides, advanced design and manufacturing strategies can build effective interfaces between sensors/actuators and other substrates, thus enhancing the desired mechanical and electrical performances. Although various literatures have reviewed the manufacture or modification of hydrogels, the summary regarding the post-treatment strategies and the creation of effective electrical and mechanically sustainable interfaces are still lacking. This paper aims at providing an overview of the following topics: (i) the manufacturing and post-engineering treatment of hydrogel sensors and actuators; (ii) the processes of creating sensor(actuator)-substrate interfaces; (iii) the development and innovation of hydrogel manufacturing and interface creation. In the first section, the manufacturing processes and the principles for post-engineering treatments are discussed, and some typical examples are also presented. In the second section, the studies of interfaces between hydrogels and various substrates are reviewed. Lastly, we summarize the current manufacturing processes of hydrogels, and provide potential perspectives for hydrogel manufacturing and post-treatment methods.
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Affiliation(s)
- Yiming Zhao
- Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, National Demonstration Center for Experimental Mechanical Engineering Education, School of Mechanical Engineering, Shandong University, Jinan, Shandong 250061, China
| | - Jiuyu Cui
- Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, National Demonstration Center for Experimental Mechanical Engineering Education, School of Mechanical Engineering, Shandong University, Jinan, Shandong 250061, China
| | - Xiaoyong Qiu
- Key Laboratory of Colloid and Interface Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, China
| | - Yonggan Yan
- Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, National Demonstration Center for Experimental Mechanical Engineering Education, School of Mechanical Engineering, Shandong University, Jinan, Shandong 250061, China
| | - Zekai Zhang
- Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, National Demonstration Center for Experimental Mechanical Engineering Education, School of Mechanical Engineering, Shandong University, Jinan, Shandong 250061, China
| | - Kezhong Fang
- Lunan Pharmaceutical Group Co., LTD, Linyi 276005, China
| | - Yu Yang
- National Engineering and Technology Research Center of Chirality Pharmaceutical, Linyi 276005, China
| | - Xiaolai Zhang
- Key Laboratory of Colloid and Interface Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, China
| | - Jun Huang
- Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, National Demonstration Center for Experimental Mechanical Engineering Education, School of Mechanical Engineering, Shandong University, Jinan, Shandong 250061, China.
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6
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Yang Y, Zhou M, Peng J, Wang X, Liu Y, Wang W, Wu D. Robust, anti-freezing and conductive bonding of chitosan-based double-network hydrogels for stable-performance flexible electronic. Carbohydr Polym 2022; 276:118753. [PMID: 34823782 DOI: 10.1016/j.carbpol.2021.118753] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 10/01/2021] [Accepted: 10/07/2021] [Indexed: 02/06/2023]
Abstract
Unstable hydrogel-substrate interfaces and defunctionalization at low temperature severely restrict versatile applications of hydrogel-based systems. Herein, various chitosan-polyacrylamide double-network (CS-PAM DN) ionic hydrogels were chemically linked with diverse substrates to construct robust and anti-freezing hydrogel-substrate combination, wherein the destructible CS physical network rendered effective energy dissipation mechanism to significantly enhanced the cohesion of hydrogels and the covalent linkage between PAM network with substrate surface strongly improved the interfacial adhesion. The synergistic effects enabled the CS-PAM DN hydrogels to be tightly bonded on diverse metals and inorganics. Impressively, the hydrogel-substrate combinations were freezing tolerant to well-maintain high interfacial toughness at low temperature. Notably, due to the high toughness and conductivity of hydrogel-metal interface, the hydrogel-metal combination can be utilized as a multi-model flexible sensor to detect strain and pressure within broad temperature range. This work may provide a platform for construction and emerging application of robust, anti-freezing and stable-performance hydrogel-based systems.
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Affiliation(s)
- Yanyu Yang
- College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China; Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Manhua Zhou
- College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Junbo Peng
- College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Xing Wang
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
| | - Yang Liu
- College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China; Departments of Cerebrovascular Diseases, The Second Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China.
| | - Wanjie Wang
- College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Decheng Wu
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China; Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China.
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7
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Abstract
Skin-like electronics are developing rapidly to realize a variety of applications such as wearable sensing and soft robotics. Hydrogels, as soft biomaterials, have been studied intensively for skin-like electronic utilities due to their unique features such as softness, wetness, biocompatibility and ionic sensing capability. These features could potentially blur the gap between soft biological systems and hard artificial machines. However, the development of skin-like hydrogel devices is still in its infancy and faces challenges including limited functionality, low ambient stability, poor surface adhesion, and relatively high power consumption (as ionic sensors). This review aims to summarize current development of skin-inspired hydrogel devices to address these challenges. We first conduct an overview of hydrogels and existing strategies to increase their toughness and conductivity. Next, we describe current approaches to leverage hydrogel devices with advanced merits including anti-dehydration, anti-freezing, and adhesion. Thereafter, we highlight state-of-the-art skin-like hydrogel devices for applications including wearable electronics, soft robotics, and energy harvesting. Finally, we conclude and outline the future trends.
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Affiliation(s)
- Binbin Ying
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King’s College Road, Toronto, ON M5S 3G8, Canada
- Department of Mechanical Engineering, McGill University, 817 Sherbrooke Street West, Montreal, QC H3A 0C3, Canada
| | - Xinyu Liu
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King’s College Road, Toronto, ON M5S 3G8, Canada
- Institute of Biomedical Engineering, University of Toronto, 164 College Street, Toronto, ON M5S 3G9, Canada
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8
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Wang Z, He X, He T, Zhao J, Wang S, Peng S, Yang D, Ye L. Polymer Network Editing of Elastomers for Robust Underwater Adhesion and Tough Bonding to Diverse Surfaces. ACS APPLIED MATERIALS & INTERFACES 2021; 13:36527-36537. [PMID: 34313126 DOI: 10.1021/acsami.1c09239] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Tough adhesives with robust adhesion are desperately needed for biomedical and technological applications. However, it is extremely challenging to engineer tough and durable adhesives that are simple to make yet also exhibit strong underwater adhesion as well as tough bonding to diverse surfaces. Here, we report bioinspired elastomers based on water-immiscible polydiolcitrates, where their tough mechanical properties, robust underwater adhesion (80 kPa), and tough bonding performance (with an interfacial toughness >1000 J m-2 and a shear and tensile strength >0.5 MPa) to diverse solid materials (glass, ceramics, and steel) are actuated by the incorporation of trace amounts of additives. The additives could edit the polymer networks during the elastomer polymerization by dramatically regulating the cross-linking structures of covalent and reversible bonds, the length of polymer chains, and the hydrophobic and hydrophilic motifs, which markedly tuned the mechanical and adhesive properties of the bioelastomers. We also demonstrate versatile applications of the durable elastomers, as tough flexible joints for solid materials, superglue, tissue sealants, hemostatic dressing, and wound repair.
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Affiliation(s)
- Zhenming Wang
- Department of Spine Surgery and Institute for Orthopaedic Research, Shenzhen People's Hospital, The First Affiliated Hospital of Southern University of Science and Technology, Jinan University Second College of Medicine, Shenzhen 518020, China.,State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, No. 14, 3th Section, South Renmin Road, Wuhou District, Chengdu 610041, China
| | - Xiaoqin He
- Department of Spine Surgery and Institute for Orthopaedic Research, Shenzhen People's Hospital, The First Affiliated Hospital of Southern University of Science and Technology, Jinan University Second College of Medicine, Shenzhen 518020, China
| | - Tongzhong He
- Department of Spine Surgery and Institute for Orthopaedic Research, Shenzhen People's Hospital, The First Affiliated Hospital of Southern University of Science and Technology, Jinan University Second College of Medicine, Shenzhen 518020, China
| | - Jin Zhao
- Department of Spine Surgery and Institute for Orthopaedic Research, Shenzhen People's Hospital, The First Affiliated Hospital of Southern University of Science and Technology, Jinan University Second College of Medicine, Shenzhen 518020, China
| | - Shang Wang
- Department of Spine Surgery and Institute for Orthopaedic Research, Shenzhen People's Hospital, The First Affiliated Hospital of Southern University of Science and Technology, Jinan University Second College of Medicine, Shenzhen 518020, China
| | - Songlin Peng
- Department of Spine Surgery and Institute for Orthopaedic Research, Shenzhen People's Hospital, The First Affiliated Hospital of Southern University of Science and Technology, Jinan University Second College of Medicine, Shenzhen 518020, China
| | - Dazhi Yang
- Department of Spine Surgery and Institute for Orthopaedic Research, Shenzhen People's Hospital, The First Affiliated Hospital of Southern University of Science and Technology, Jinan University Second College of Medicine, Shenzhen 518020, China
| | - Ling Ye
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, No. 14, 3th Section, South Renmin Road, Wuhou District, Chengdu 610041, China
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Jiang Z, Li Y, Shen Y, Yang J, Zhang Z, You Y, Lv Z, Yao L. Robust Hydrogel Adhesive with Dual Hydrogen Bond Networks. Molecules 2021; 26:molecules26092688. [PMID: 34064401 PMCID: PMC8124778 DOI: 10.3390/molecules26092688] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 04/29/2021] [Accepted: 04/29/2021] [Indexed: 11/16/2022] Open
Abstract
Hydrogel adhesives are attractive for applications in intelligent soft materials and tissue engineering, but conventional hydrogels usually have poor adhesion. In this study, we designed a strategy to synthesize a novel adhesive with a thin hydrogel adhesive layer integrated on a tough substrate hydrogel. The adhesive layer with positive charges of ammonium groups on the polymer backbones strongly bonds to a wide range of nonporous materials’ surfaces. The substrate layer with a dual hydrogen bond system consists of (i) weak hydrogen bonds between N,N-dimethyl acrylamide (DMAA) and acrylic acid (AAc) units and (ii) strong multiple hydrogen bonds between 2-ureido-4[1H]-pyrimidinone (UPy) units. The dual hydrogen-bond network endowed the hydrogel adhesives with unique mechanical properties, e.g., toughness, highly stretchability, and insensitivity to notches. The hydrogel adhesion to four types of materials like glass, 316L stainless steel, aluminum, Al2O3 ceramic, and two biological tissues including pig skin and pig kidney was investigated. The hydrogel bonds strongly to dry solid surfaces and wet tissue, which is promising for biomedical applications.
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10
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Abstract
Polymeric tissue adhesives provide versatile materials for wound management and are widely used in a variety of medical settings ranging from minor to life-threatening tissue injuries. Compared to the traditional methods of wound closure (i.e., suturing and stapling), they are relatively easy to use, enable rapid application, and introduce minimal tissue damage. Furthermore, they can act as hemostats to control bleeding and provide a tissue-healing environment at the wound site. Despite their numerous current applications, tissue adhesives still face several limitations and unresolved challenges (e.g., weak adhesion strength and poor mechanical properties) that limit their use, leaving ample room for future improvements. Successful development of next-generation adhesives will likely require a holistic understanding of the chemical and physical properties of the tissue-adhesive interface, fundamental mechanisms of tissue adhesion, and requirements for specific clinical applications. In this review, we discuss a set of rational guidelines for design of adhesives, recent progress in the field along with examples of commercially available adhesives and those under development, tissue-specific considerations, and finally potential functions for future adhesives. Advances in tissue adhesives will open new avenues for wound care and potentially provide potent therapeutics for various medical applications.
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Affiliation(s)
- Sungmin Nam
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02134, United States.,Wyss Institute for Biologically Inspired Engineering, Cambridge, Massachusetts 02115, United States
| | - David Mooney
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02134, United States.,Wyss Institute for Biologically Inspired Engineering, Cambridge, Massachusetts 02115, United States
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11
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Liu H, Zhao X, Zhang Y, Ma S, Ma Z, Pei X, Cai M, Zhou F. Cartilage Mimics Adaptive Lubrication. ACS APPLIED MATERIALS & INTERFACES 2020; 12:51114-51121. [PMID: 33140650 DOI: 10.1021/acsami.0c15693] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The natural cartilage layer exhibits excellent interface low friction and good load-bearing properties based on the mechanically controlled adaptive lubrication mechanism. Understanding and imitating such a mechanism is important for developing high-load-bearing water-lubrication materials. Here, we report the successful preparation of thermoresponsive layered materials by grafting a poly(3-sulfopropyl methacrylate potassium salt) (PSPMA) polyelectrolyte brush onto the subsurface of an initiator-embedded high strength hydrogel [poly(N-isopropylacrylamide-co-acrylic acid-co-initiator/Fe3+)] [P(NIPAAm-AA-iBr/Fe3+)]. The top soft hydrogel/brush composite layer provides aqueous lubrication, while the bottom thermoresponsive hydrogel layer exhibits adaptive load-bearing capacity that shows tunable stiff or modulus in response to the temperature above and below the lower critical solution temperature (LCST, 32.5 °C). An obvious friction-reduction feature is realized above the LCST, resulting from the dynamic increase of the bottom layer mechanical modulus. Furthermore, in situ lubrication-improvement behavior is achieved upon applying a near-infrared (NIR) laser onto the surface of Fe3O4 nanoparticle (NP)-integrated layered materials. Such a typical lubrication-regulated behavior can be attributed to the synergy effect of the improved load-bearing capacity of the bottom layer and the enhanced lubrication behavior of the top layer with an increase in the polyelectrolyte brush chain density, which is similar to the mechanically controlled adaptive lubrication mechanism of the natural cartilage layer. Current research results provide an inspiration for developing novel biomimetic lubrication materials with considerable load-bearing capacity and also propose a strategy for designing intelligent/stable friction-actuation devices.
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Affiliation(s)
- Hui Liu
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, Lanzhou 730000, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaoduo Zhao
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, Lanzhou 730000, China
| | - Yunlei Zhang
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, Lanzhou 730000, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shuanhong Ma
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, Lanzhou 730000, China
| | - Zhengfeng Ma
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, Lanzhou 730000, China
| | - Xiaowei Pei
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, Lanzhou 730000, China
| | - Meirong Cai
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, Lanzhou 730000, China
| | - Feng Zhou
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, Lanzhou 730000, China
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12
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Qi Y, Zhang W, Li G, Niu L, Zhang Y, Tang R, Feng G. An oriented-collagen scaffold including Wnt5a promotes osteochondral regeneration and cartilage interface integration in a rabbit model. FASEB J 2020; 34:11115-11132. [PMID: 32627881 DOI: 10.1096/fj.202000280r] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 05/20/2020] [Accepted: 06/15/2020] [Indexed: 01/07/2023]
Abstract
Articular cartilage regeneration remains a major challenge in orthopedics. Noncanonical Wnt5a is a particularly attractive growth factor in this context; Wnt5a inhibits chondrocyte hypertrophy but maintains chondrogenesis. We designed a novel, vertically oriented-collagen scaffold. The effect of Wnt5a on MSCs and chondrocytes and the therapeutic effects of the Wnt5a/oriented-collagen scaffold in terms of osteochondral repair and cartilage integration were evaluated. In vitro, the proliferation, migration, and differentiation of MSCs and chondrocytes treated with Wnt5a, and the mechanisms thereof, were assessed. mRNA microarray analysis was performed to compare the expression profiles of MSCs before and after Wnt5a treatment. In vivo, full-thickness cylindrical osteochondral defects (4 mm in diameter, 3 mm in depth) were created in the patellar grooves of 24 New Zealand white rabbits and implanted with oriented-collagen scaffolds (n = 8), Wnt5a/oriented-collagen scaffolds (n = 8), or nothing (n = 8). After 6 and 12 weeks, integration and tissue responses were evaluated. The proliferation, migration, chondrogenic differentiation, and extracellular matrix formation of/by MSCs and chondrocytes improved greatly after treatment with Wnt5a. Western blotting showed that the PI3K/AKT/JNK signaling pathway was activated. Microarray analysis revealed that the Wnt5a group exhibited a significant upregulation of the PI3K pathway. Reactome GSEA pathway interaction analysis revealed that such upregulation was associated with collagen and extracellular matrix formation. In vivo, the Wnt5a/oriented-collagen scaffold group exhibited optimal interface integration, cartilage regeneration, and collagenous fiber arrangement, accompanied by significantly increased glycosaminoglycan and collagen accumulations in the zones of regeneration and integration, compared to the other groups. Gene expression analysis showed that the levels of mRNAs encoding genes involved in cartilage formation were significantly increased in the Wnt5a/oriented, collagen scaffold group (all P < .05). Wnt5a promoted the proliferation, migration, and chondrogenic differentiation of MSCs and chondrocytes via the activation of the PI3K/AKT/JNK signaling pathway. The Wnt5a/oriented-collagen constructs enhanced the structure-specific regeneration of hyaline cartilage in a rabbit model and may be a promising treatment for the repair of human cartilage defects.
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Affiliation(s)
- Yiying Qi
- Department of Orthopedic Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, P.R. China
| | - Wenkan Zhang
- Department of Orthopedic Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, P.R. China
| | - Guoqi Li
- Department of Orthopedic Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, P.R. China
| | - Lie Niu
- Department of Orthopedic Surgery, People's Hospital of Dongping County, Shandong, China
| | - Yuxiang Zhang
- Department of Orthopedic Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, P.R. China
| | - Ruofu Tang
- Department of Orthopedic Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, P.R. China
| | - Gang Feng
- Department of Orthopedic Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, P.R. China
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13
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Tavafoghi M, Sheikhi A, Tutar R, Jahangiry J, Baidya A, Haghniaz R, Khademhosseini A. Engineering Tough, Injectable, Naturally Derived, Bioadhesive Composite Hydrogels. Adv Healthc Mater 2020; 9:e1901722. [PMID: 32329254 DOI: 10.1002/adhm.201901722] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Revised: 02/08/2020] [Accepted: 02/10/2020] [Indexed: 01/13/2023]
Abstract
Engineering mechanically robust bioadhesive hydrogels that can withstand large strains may open new opportunities for the sutureless sealing of highly stretchable tissues. While typical chemical modifications of hydrogels, such as increasing the functional group density of crosslinkable moieties and blending them with other polymers or nanomaterials have resulted in improved mechanical stiffness, the modified hydrogels have often exhibited increased brittleness resulting in deteriorated sealing capabilities under large strains. Furthermore, highly elastic hydrogels, such as tropoelastin derivatives are highly expensive. Here, gelatin methacryloyl (GelMA) is hybridized with methacrylate-modified alginate (AlgMA) to enable ion-induced reversible crosslinking that can dissipate energy under strain. The hybrid hydrogels provide a photocrosslinkable, injectable, and bioadhesive platform with an excellent toughness that can be tailored using divalent cations, such as calcium. This class of hybrid biopolymers with more than 600% improved toughness compared to GelMA may set the stage for durable, mechanically resilient, and cost-effective tissue sealants. This strategy to increase the toughness of hydrogels may be extended to other crosslinkable polymers with similarly reactive moieties.
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Affiliation(s)
- Maryam Tavafoghi
- Department of BioengineeringUniversity of California Los Angeles, 410 Westwood Plaza Los Angeles CA 90095 USA
- Center for Minimally Invasive Therapeutics (C‐MIT)University of California Los Angeles, 570 Westwood Plaza Los Angeles CA 90095 USA
- California NanoSystems Institute (CNSI)University of California Los Angeles, 570 Westwood Plaza Los Angeles CA 90095 USA
| | - Amir Sheikhi
- Department of BioengineeringUniversity of California Los Angeles, 410 Westwood Plaza Los Angeles CA 90095 USA
- Center for Minimally Invasive Therapeutics (C‐MIT)University of California Los Angeles, 570 Westwood Plaza Los Angeles CA 90095 USA
- California NanoSystems Institute (CNSI)University of California Los Angeles, 570 Westwood Plaza Los Angeles CA 90095 USA
- Department of Chemical EngineeringThe Pennsylvania State University University Park PA 16802 USA
- Department of Biomedical EngineeringThe Pennsylvania State University University Park PA 16802 USA
| | - Rumeysa Tutar
- Department of BioengineeringUniversity of California Los Angeles, 410 Westwood Plaza Los Angeles CA 90095 USA
- Center for Minimally Invasive Therapeutics (C‐MIT)University of California Los Angeles, 570 Westwood Plaza Los Angeles CA 90095 USA
- California NanoSystems Institute (CNSI)University of California Los Angeles, 570 Westwood Plaza Los Angeles CA 90095 USA
- Department of Chemistry, Faculty of EngineeringIstanbul University‐Cerrahpasa Avcılar Istanbul 34320 Turkey
| | - Jamileh Jahangiry
- Department of BioengineeringUniversity of California Los Angeles, 410 Westwood Plaza Los Angeles CA 90095 USA
- Center for Minimally Invasive Therapeutics (C‐MIT)University of California Los Angeles, 570 Westwood Plaza Los Angeles CA 90095 USA
- California NanoSystems Institute (CNSI)University of California Los Angeles, 570 Westwood Plaza Los Angeles CA 90095 USA
| | - Avijit Baidya
- Department of BioengineeringUniversity of California Los Angeles, 410 Westwood Plaza Los Angeles CA 90095 USA
- Center for Minimally Invasive Therapeutics (C‐MIT)University of California Los Angeles, 570 Westwood Plaza Los Angeles CA 90095 USA
- California NanoSystems Institute (CNSI)University of California Los Angeles, 570 Westwood Plaza Los Angeles CA 90095 USA
| | - Reihaneh Haghniaz
- Department of BioengineeringUniversity of California Los Angeles, 410 Westwood Plaza Los Angeles CA 90095 USA
- Center for Minimally Invasive Therapeutics (C‐MIT)University of California Los Angeles, 570 Westwood Plaza Los Angeles CA 90095 USA
- California NanoSystems Institute (CNSI)University of California Los Angeles, 570 Westwood Plaza Los Angeles CA 90095 USA
| | - Ali Khademhosseini
- Department of BioengineeringUniversity of California Los Angeles, 410 Westwood Plaza Los Angeles CA 90095 USA
- Center for Minimally Invasive Therapeutics (C‐MIT)University of California Los Angeles, 570 Westwood Plaza Los Angeles CA 90095 USA
- California NanoSystems Institute (CNSI)University of California Los Angeles, 570 Westwood Plaza Los Angeles CA 90095 USA
- Department of Chemical and Biomolecular EngineeringUniversity of California Los Angeles, 5531 Boelter Hall Los Angeles CA 90095 USA
- Department of Radiological Sciences, David Geffen School of MedicineUniversity of California Los Angeles, 10833 Le Conte Ave Los Angeles CA 90095 USA
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14
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Liu J, Lin S, Liu X, Qin Z, Yang Y, Zang J, Zhao X. Fatigue-resistant adhesion of hydrogels. Nat Commun 2020; 11:1071. [PMID: 32103027 PMCID: PMC7044439 DOI: 10.1038/s41467-020-14871-3] [Citation(s) in RCA: 116] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 02/03/2020] [Indexed: 01/19/2023] Open
Abstract
The adhesion of soft connective tissues (tendons, ligaments, and cartilages) on bones in many animals can maintain high toughness (∽800 J m-2) over millions of cycles of mechanical loads. Such fatigue-resistant adhesion has not been achieved between synthetic hydrogels and engineering materials, but is highly desirable for diverse applications such as artificial cartilages and tendons, robust antifouling coatings, and hydrogel robots. Inspired by the nanostructured interfaces between tendons/ligaments/cartilages and bones, we report that bonding ordered nanocrystalline domains of synthetic hydrogels on engineering materials can give a fatigue-resistant adhesion with an interfacial fatigue threshold of 800 J m-2, because the fatigue-crack propagation at the interface requires a higher energy to fracture the ordered nanostructures than amorphous polymer chains. Our method enables fatigue-resistant hydrogel coatings on diverse engineering materials with complex geometries. We further demonstrate that the fatigue-resistant hydrogel coatings exhibit low friction and low wear against natural cartilages.
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Affiliation(s)
- Ji Liu
- Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.,Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Shaoting Lin
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Xinyue Liu
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Zhao Qin
- Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY, 13244, USA.,Syracuse Biomaterials Institute, Syracuse University, Syracuse, NY, 13244, USA
| | - Yueying Yang
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.,School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Jianfeng Zang
- School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China.
| | - Xuanhe Zhao
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA. .,Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.
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15
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Microporous acellular extracellular matrix combined with adipose-derived stem cell sheets as a promising tissue patch promoting articular cartilage regeneration and interface integration. Cytotherapy 2019; 21:856-869. [DOI: 10.1016/j.jcyt.2019.02.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Revised: 01/04/2019] [Accepted: 02/07/2019] [Indexed: 11/20/2022]
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16
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Xu J, Wang G, Wu Y, Ren X, Gao G. Ultrastretchable Wearable Strain and Pressure Sensors Based on Adhesive, Tough, and Self-healing Hydrogels for Human Motion Monitoring. ACS APPLIED MATERIALS & INTERFACES 2019; 11:25613-25623. [PMID: 31273992 DOI: 10.1021/acsami.9b08369] [Citation(s) in RCA: 89] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Currently, flexible wearable hydrogel-based sensors have attracted considerable attention due to their promising applications in a variety of fields. However, concurrently integrating toughness, adhesiveness, self-healing ability, and conductivity into the hydrogel is still a great challenge. Here, casein sodium salt from bovine milk (sodium casein, SC) and polydopamine (PDA, inspired by mussels) were successfully introduced into the polyacrylamide (PAAm) hydrogel system to fabricate a tough and adhesive SC-PDA hydrogel. The hydrogel exhibits splendidly reversible adhesive behavioral bonding toward various materials and even human skin. Moreover, based on the dynamic cross-linking of SC and PDA in the system, the hydrogel has superstretching ability, excellent fatigue resistance, and rapid self-healing ability. In addition, the existence of sodium ions also endowed the SC-PDA hydrogel with sensitive deformation-dependent conductivity to act as a flexible strain and pressure sensor for directly monitoring large-scale human motions (e.g., joint bending) and tiny physiological signals (e.g., speaking and breathing). Therefore, the strategy would broaden the path of a new generation of hydrogel-based sensors for wide applications.
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Affiliation(s)
- Jiajun Xu
- Polymeric and Soft Materials Laboratory, School of Chemical Engineering and Advanced Institute of Materials Science , Changchun University of Technology , Changchun 130012 , China
| | - Guangyu Wang
- Polymeric and Soft Materials Laboratory, School of Chemical Engineering and Advanced Institute of Materials Science , Changchun University of Technology , Changchun 130012 , China
| | - Yufan Wu
- Polymeric and Soft Materials Laboratory, School of Chemical Engineering and Advanced Institute of Materials Science , Changchun University of Technology , Changchun 130012 , China
| | - Xiuyan Ren
- Polymeric and Soft Materials Laboratory, School of Chemical Engineering and Advanced Institute of Materials Science , Changchun University of Technology , Changchun 130012 , China
| | - Guanghui Gao
- Polymeric and Soft Materials Laboratory, School of Chemical Engineering and Advanced Institute of Materials Science , Changchun University of Technology , Changchun 130012 , China
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17
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Horbert V, Xin L, Foehr P, Brinkmann O, Bungartz M, Burgkart RH, Graeve T, Kinne RW. In Vitro Analysis of Cartilage Regeneration Using a Collagen Type I Hydrogel (CaReS) in the Bovine Cartilage Punch Model. Cartilage 2019; 10:346-363. [PMID: 29463136 PMCID: PMC6585298 DOI: 10.1177/1947603518756985] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
OBJECTIVE Limitations of matrix-assisted autologous chondrocyte implantation to regenerate functional hyaline cartilage demand a better understanding of the underlying cellular/molecular processes. Thus, the regenerative capacity of a clinically approved hydrogel collagen type I implant was tested in a standardized bovine cartilage punch model. METHODS Cartilage rings (outer diameter 6 mm; inner defect diameter 2 mm) were prepared from the bovine trochlear groove. Collagen implants (± bovine chondrocytes) were placed inside the cartilage rings and cultured up to 12 weeks. Cartilage-implant constructs were analyzed by histology (hematoxylin/eosin; safranin O), immunohistology (aggrecan, collagens 1 and 2), and for protein content, RNA expression, and implant push-out force. RESULTS Cartilage-implant constructs revealed vital morphology, preserved matrix integrity throughout culture, progressive, but slight proteoglycan loss from the "host" cartilage or its surface and decreasing proteoglycan release into the culture supernatant. In contrast, collagen 2 and 1 content of cartilage and cartilage-implant interface was approximately constant over time. Cell-free and cell-loaded implants showed (1) cell migration onto/into the implant, (2) progressive deposition of aggrecan and constant levels of collagens 1 and 2, (3) progressively increased mRNA levels for aggrecan and collagen 2, and (4) significantly augmented push-out forces over time. Cell-loaded implants displayed a significantly earlier and more long-lasting deposition of aggrecan, as well as tendentially higher push-out forces. CONCLUSION Preserved tissue integrity and progressively increasing cartilage differentiation and push-out forces for up to 12 weeks of cultivation suggest initial cartilage regeneration and lateral bonding of the implant in this in vitro model for cartilage replacement materials.
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Affiliation(s)
- Victoria Horbert
- Experimental Rheumatology Unit,
Department of Orthopedics, Jena University Hospital, Waldkrankenhaus “Rudolf Elle”,
Eisenberg, Germany
| | - Long Xin
- Experimental Rheumatology Unit,
Department of Orthopedics, Jena University Hospital, Waldkrankenhaus “Rudolf Elle”,
Eisenberg, Germany,Department of Orthopedics, Tongde
Hospital of Zhejiang Province, Hangzhou, Zhejiang, China
| | - Peter Foehr
- Biomechanics Laboratory, Department of
Orthopedics and Sportsorthopedics, Klinikum rechts der Isar, Technische Universität
München, Munich, Germany
| | - Olaf Brinkmann
- Chair of Orthopedics, Department of
Orthopedics, Jena University Hospital, Waldkrankenhaus “Rudolf Elle”, Eisenberg,
Germany
| | - Matthias Bungartz
- Chair of Orthopedics, Department of
Orthopedics, Jena University Hospital, Waldkrankenhaus “Rudolf Elle”, Eisenberg,
Germany
| | - Rainer H. Burgkart
- Biomechanics Laboratory, Department of
Orthopedics and Sportsorthopedics, Klinikum rechts der Isar, Technische Universität
München, Munich, Germany
| | | | - Raimund W. Kinne
- Experimental Rheumatology Unit,
Department of Orthopedics, Jena University Hospital, Waldkrankenhaus “Rudolf Elle”,
Eisenberg, Germany,Raimund W. Kinne, Experimental Rheumatology
Unit, Department of Orthopedics, Jena University Hospital, Waldkrankenhaus
“Rudolf Elle”, Klosterlausnitzer Straße 81, D-07607, Eisenberg, Germany.
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18
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Yang S, Xu W, Tu M, Jiang L. Diffusive Adhesives for Water-Rich Materials: Strong and Tunable Adhesion Beyond the Interface. Chemistry 2019; 25:8085-8091. [PMID: 30964219 DOI: 10.1002/chem.201900606] [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: 02/08/2019] [Indexed: 11/07/2022]
Abstract
It is notoriously difficult to adhere water-rich materials, such as hydrogels and biological tissues. Existing adhesives usually suffer from weak and nonadjustable adhesion strength, in part because the contact between the adhesive and substrate is largely restrained to the adhesive/substrate interface. In this study, we have attempted to overcome this shortcoming by developing a class of diffusive adhesives (DAs) that can extend adhesion deep into the substrate to maximize the adhesive/substrate contact. The DAs consist of hydrogel matrices and preloaded water-soluble monomers and crosslinkers that can diffuse extensively into the water-rich substrates after adhesive/substrate contact. Polymerization and crosslinking of the monomers are then triggered leading to a bridging network that interpenetrates the DA and substrate skeletons and topologically binds them together. This kind of adhesion, in the absence of adhesive/substrate covalent bonding, is of high strength and toughness, comparable to those of the best-performing natural and artificial adhesives. More importantly, we can precisely tune the adhesion strength on demand by manipulating the diffusion profile. It is envisioned that the DA family could be extended to include a large pool of hydrogel matrices and monomers, and that they could be particularly useful in biological and medical applications.
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Affiliation(s)
- Shenyu Yang
- College of Chemistry and Materials Science, Jinan University, Guangzhou, 510632, P.R. China
| | - Weiwei Xu
- College of Chemistry and Materials Science, Jinan University, Guangzhou, 510632, P.R. China
| | - Mei Tu
- College of Chemistry and Materials Science, Jinan University, Guangzhou, 510632, P.R. China
| | - Lingxiang Jiang
- College of Chemistry and Materials Science, Jinan University, Guangzhou, 510632, P.R. China
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19
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Tunable Adhesion for Bio-Integrated Devices. MICROMACHINES 2018; 9:mi9100529. [PMID: 30424462 PMCID: PMC6215118 DOI: 10.3390/mi9100529] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 10/14/2018] [Accepted: 10/16/2018] [Indexed: 02/03/2023]
Abstract
With the rapid development of bio-integrated devices and tissue adhesives, tunable adhesion to soft biological tissues started gaining momentum. Strong adhesion is desirable when used to efficiently transfer vital signals or as wound dressing and tissue repair, whereas weak adhesion is needed for easy removal, and it is also the essential step for enabling repeatable use. Both the physical and chemical properties (e.g., moisture level, surface roughness, compliance, and surface chemistry) vary drastically from the skin to internal organ surfaces. Therefore, it is important to strategically design the adhesive for specific applications. Inspired largely by the remarkable adhesion properties found in several animal species, effective strategies such as structural design and novel material synthesis were explored to yield adhesives to match or even outperform their natural counterparts. In this mini-review, we provide a brief overview of the recent development of tunable adhesives, with a focus on their applications toward bio-integrated devices and tissue adhesives.
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20
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Koo S, Hargreaves BA, Gold GE, Dragoo JL. Fabrication of Custom-Shaped Grafts for Cartilage Regeneration. Int J Artif Organs 2018. [DOI: 10.1177/039139881003301006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Purpose to create a custom-shaped graft through 3D tissue shape reconstruction and rapid-prototype molding methods using MRI data, and to test the accuracy of the custom-shaped graft against the original anatomical defect. Methods An iatrogenic defect on the distal femur was identified with a 1.5 Tesla MRI and its shape was reconstructed into a three-dimensional (3D) computer model by processing the 3D MRI data. First, the accuracy of the MRI-derived 3D model was tested against a laser-scan based 3D model of the defect. A custom-shaped polyurethane graft was fabricated from the laser-scan based 3D model by creating custom molds through computer aided design and rapid-prototyping methods. The polyurethane tissue was laser-scanned again to calculate the accuracy of this process compared to the original defect. Results The volumes of the defect models from MRI and laser-scan were 537 mm3 and 405 mm3, respectively, implying that the MRI model was 33% larger than the laser-scan model. The average (±SD) distance deviation of the exterior surface of the MRI model from the laser-scan model was 0.4±0.4 mm. The custom-shaped tissue created from the molds was qualitatively very similar to the original shape of the defect. The volume of the custom-shaped cartilage tissue was 463 mm3 which was 15% larger than the laser-scan model. The average (±SD) distance deviation between the two models was 0.04±0.19 mm. Conclusions This investigation proves the concept that custom-shaped engineered grafts can be fabricated from standard sequence 3-D MRI data with the use of CAD and rapid-prototyping technology. The accuracy of this technology may help solve the interfacial problem between native cartilage and graft, if the grafts are custom made for the specific defect. The major source of error in fabricating a 3D custom-shaped cartilage graft appears to be the accuracy of a MRI data itself; however, the precision of the model is expected to increase by the utilization of advanced MR sequences with higher magnet strengths.
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Affiliation(s)
- Seungbum Koo
- School of Mechanical Engineering, Chung-Ang University, Seoul - South Korea
| | | | - Garry E. Gold
- Department of Radiology, Stanford University, Stanford, California - USA
| | - Jason L. Dragoo
- Department of Orthopedic Surgery, Stanford University, Stanford, California - USA
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21
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Xu J, Fan Z, Duan L, Gao G. A tough, stretchable, and extensively sticky hydrogel driven by milk protein. Polym Chem 2018. [DOI: 10.1039/c8py00319j] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A tough and adhesive hydrogel assisted by milk protein was proposed, which could adhere to diverse surfaces of various materials.
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Affiliation(s)
- Jianyu Xu
- School of Chemical Engineering
- Changchun University of Technology
- Changchun 130012
- China
| | - Ziwen Fan
- School of Chemistry and Life Science
- Changchun University of Technology
- Changchun 130012
- China
| | - Lijie Duan
- School of Chemistry and Life Science
- Changchun University of Technology
- Changchun 130012
- China
| | - Guanghui Gao
- School of Chemical Engineering
- Changchun University of Technology
- Changchun 130012
- China
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22
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Li J, Celiz AD, Yang J, Yang Q, Wamala I, Whyte W, Seo BR, Vasilyev NV, Vlassak JJ, Suo Z, Mooney DJ. Tough adhesives for diverse wet surfaces. Science 2017; 357:378-381. [PMID: 28751604 PMCID: PMC5905340 DOI: 10.1126/science.aah6362] [Citation(s) in RCA: 728] [Impact Index Per Article: 104.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 04/27/2017] [Accepted: 06/22/2017] [Indexed: 12/11/2022]
Abstract
Adhesion to wet and dynamic surfaces, including biological tissues, is important in many fields but has proven to be extremely challenging. Existing adhesives are cytotoxic, adhere weakly to tissues, or cannot be used in wet environments. We report a bioinspired design for adhesives consisting of two layers: an adhesive surface and a dissipative matrix. The former adheres to the substrate by electrostatic interactions, covalent bonds, and physical interpenetration. The latter amplifies energy dissipation through hysteresis. The two layers synergistically lead to higher adhesion energies on wet surfaces as compared with those of existing adhesives. Adhesion occurs within minutes, independent of blood exposure and compatible with in vivo dynamic movements. This family of adhesives may be useful in many areas of application, including tissue adhesives, wound dressings, and tissue repair.
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Affiliation(s)
- J Li
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, MA 02138, USA
- Department of Mechanical Engineering, McGill University, Montreal, Quebec H3A 0G4, Canada
| | - A D Celiz
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, MA 02138, USA
- Advanced Materials and Healthcare Technologies Division, School of Pharmacy, University of Nottingham, Nottingham NG7 2RD, UK
| | - J Yang
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
- Kavli Institute for Nanobio Science and Technology, Harvard University, Cambridge, MA 02138, USA
| | - Q Yang
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
- Kavli Institute for Nanobio Science and Technology, Harvard University, Cambridge, MA 02138, USA
- School of Aerospace, Tsinghua University, Beijing 100084, People's Republic of China
| | - I Wamala
- Departments of Cardiac Surgery, Boston Children's Hospital, Boston, MA 02115, USA
| | - W Whyte
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, MA 02138, USA
- Advanced Materials and Bioengineering Research Centre, Royal College of Surgeons in Ireland and Trinity College Dublin, Dublin, Ireland
| | - B R Seo
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, MA 02138, USA
| | - N V Vasilyev
- Departments of Cardiac Surgery, Boston Children's Hospital, Boston, MA 02115, USA
| | - J J Vlassak
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
| | - Z Suo
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
- Kavli Institute for Nanobio Science and Technology, Harvard University, Cambridge, MA 02138, USA
| | - D J Mooney
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, MA 02138, USA
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23
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Mumme M, Steinitz A, Nuss KM, Klein K, Feliciano S, Kronen P, Jakob M, von Rechenberg B, Martin I, Barbero A, Pelttari K. Regenerative Potential of Tissue-Engineered Nasal Chondrocytes in Goat Articular Cartilage Defects. Tissue Eng Part A 2016; 22:1286-1295. [DOI: 10.1089/ten.tea.2016.0159] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Marcus Mumme
- Department of Biomedicine, University Hospital of Basel, University of Basel, Basel, Switzerland
- Clinic for Traumatologic Surgery, University Hospital of Basel, Basel, Switzerland
| | - Amir Steinitz
- Department of Biomedicine, University Hospital of Basel, University of Basel, Basel, Switzerland
- Clinic for Traumatologic Surgery, University Hospital of Basel, Basel, Switzerland
| | - Katja M. Nuss
- Musculoskeletal Research Unit (MSRU), Equine Department, University of Zurich, Zürich, Switzerland
| | - Karina Klein
- Musculoskeletal Research Unit (MSRU), Equine Department, University of Zurich, Zürich, Switzerland
| | - Sandra Feliciano
- Department of Biomedicine, University Hospital of Basel, University of Basel, Basel, Switzerland
| | - Peter Kronen
- Competence Center for Applied Biotechnology and Molecular Medicine (CABMM), University of Zurich, Zürich, Switzerland
- Veterinary Anaesthesia Services–International (VAS), Winterthur, Switzerland
| | - Marcel Jakob
- Clinic for Traumatologic Surgery, University Hospital of Basel, Basel, Switzerland
| | - Brigitte von Rechenberg
- Musculoskeletal Research Unit (MSRU), Equine Department, University of Zurich, Zürich, Switzerland
- Competence Center for Applied Biotechnology and Molecular Medicine (CABMM), University of Zurich, Zürich, Switzerland
| | - Ivan Martin
- Department of Biomedicine, University Hospital of Basel, University of Basel, Basel, Switzerland
| | - Andrea Barbero
- Department of Biomedicine, University Hospital of Basel, University of Basel, Basel, Switzerland
| | - Karoliina Pelttari
- Department of Biomedicine, University Hospital of Basel, University of Basel, Basel, Switzerland
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Hunziker EB, Lippuner K, Keel MJB, Shintani N. Novel organ-slice culturing system to simulate meniscal repair: Proof of concept using a synovium-based pool of meniscoprogenitor cells. J Orthop Res 2016; 34:1588-96. [PMID: 26790377 DOI: 10.1002/jor.23172] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 01/08/2016] [Indexed: 02/04/2023]
Abstract
Meniscal injuries can occur secondary to trauma or be instigated by the changes in knee-joint function that are associated with aging, osteo- and rheumatoid arthritis, disturbances in gait, and obesity. Sixty percent of persons over 50 years of age manifest signs of meniscal pathology. The surgical and arthroscopic measures that are currently implemented to treat meniscal deficiencies bring only transient relief from pain and effect but a temporary improvement in joint function. Although tissue-engineering-based approaches to meniscal repair are now being pursued, an appropriate in-vitro model has not been conceived. The aim of this study was to develop an organ-slice culturing system to simulate the repair of human meniscal lesions in vitro. The model consists of a ring of bovine meniscus enclosing a chamber that represents the defect and reproduces its sequestered physiological microenvironment. The defect, which is closed with a porous membrane, is filled with fragments of synovial tissue, as a source of meniscoprogenitor cells, and a fibrin-embedded, calcium-phosphate-entrapped depot of the meniscogenic agents BMP-2 and TGF-β1. After culturing for 2 to 6 weeks, the constructs were evaluated histochemically and histomorphometrically, as well as immunohistochemically, for the apoptotic marker caspase 3 and collagen types I and II. Under the defined conditions, the fragments of synovium underwent differentiation into meniscal tissue, which bonded with the parent meniscal wall. Both the parent and the neoformed meniscal tissue survived the duration of the culturing period without significant cell losses. The concept on which the in-vitro system is based was thus validated. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 34:1588-1596, 2016.
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Affiliation(s)
- Ernst B Hunziker
- Department of Osteoporosis, Inselspital, University of Bern, Bern, Switzerland.,Orthopaedic Surgery, Inselspital, University of Bern, Bern, Switzerland.,Clinical Research, Inselspital, University of Bern, Bern, Switzerland
| | - Kurt Lippuner
- Department of Osteoporosis, Inselspital, University of Bern, Bern, Switzerland.,Clinical Research, Inselspital, University of Bern, Bern, Switzerland
| | - Marius J B Keel
- Orthopaedic Surgery, Inselspital, University of Bern, Bern, Switzerland.,Clinical Research, Inselspital, University of Bern, Bern, Switzerland
| | - Nahoko Shintani
- Department of Osteoporosis, Inselspital, University of Bern, Bern, Switzerland.,Orthopaedic Surgery, Inselspital, University of Bern, Bern, Switzerland.,Clinical Research, Inselspital, University of Bern, Bern, Switzerland
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25
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Yuk H, Zhang T, Lin S, Parada GA, Zhao X. Tough bonding of hydrogels to diverse non-porous surfaces. NATURE MATERIALS 2016; 15:190-6. [PMID: 26552058 PMCID: PMC4762474 DOI: 10.1038/nmat4463] [Citation(s) in RCA: 517] [Impact Index Per Article: 64.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Accepted: 09/25/2015] [Indexed: 05/19/2023]
Abstract
In many animals, the bonding of tendon and cartilage to bone is extremely tough (for example, interfacial toughness ∼800 J m(-2); refs ,), yet such tough interfaces have not been achieved between synthetic hydrogels and non-porous surfaces of engineered solids. Here, we report a strategy to design tough transparent and conductive bonding of synthetic hydrogels containing 90% water to non-porous surfaces of diverse solids, including glass, silicon, ceramics, titanium and aluminium. The design strategy is to anchor the long-chain polymer networks of tough hydrogels covalently to non-porous solid surfaces, which can be achieved by the silanation of such surfaces. Compared with physical interactions, the chemical anchorage results in a higher intrinsic work of adhesion and in significant energy dissipation of bulk hydrogel during detachment, which lead to interfacial toughness values over 1,000 J m(-2). We also demonstrate applications of robust hydrogel-solid hybrids, including hydrogel superglues, mechanically protective hydrogel coatings, hydrogel joints for robotic structures and robust hydrogel-metal conductors.
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Affiliation(s)
- Hyunwoo Yuk
- Soft Active Materials Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Teng Zhang
- Soft Active Materials Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Shaoting Lin
- Soft Active Materials Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - German Alberto Parada
- Soft Active Materials Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
| | - Xuanhe Zhao
- Soft Active Materials Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- To whom correspondence should be addressed.
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26
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Gelse K, Riedel D, Pachowsky M, Hennig FF, Trattnig S, Welsch GH. Limited integrative repair capacity of native cartilage autografts within cartilage defects in a sheep model. J Orthop Res 2015; 33:390-7. [PMID: 25470997 DOI: 10.1002/jor.22773] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Accepted: 10/20/2014] [Indexed: 02/04/2023]
Abstract
The purpose of this study was to investigate integration and cellular outgrowth of native cartilage autografts transplanted into articular cartilage defects. Native cartilage autografts were applied into chondral defects in the femoral condyle of adult sheep. Within the defects, the calcified cartilage layer was either left intact or perforated to induce bone marrow stimulation. Empty defects served as controls. The joints were analyzed after 6 and 26 weeks by macroscopic and histological analysis using the ICRS II Score and Modified O'Driscoll Scores. Non-treated defects did not show any endogenous regenerative response and bone marrow stimulation induced fibrous repair tissue. Transplanted native cartilage grafts only insufficiently integrated with the defect borders. Cell death and loss of proteoglycans were present at the margins of the grafts at 6 weeks, which was only partially restored at 26 weeks. Significant cellular outgrowth from the grafts or defect borders could not be observed. Bonding of the grafts could be improved by additional bone marrow stimulation providing ingrowing cells that formed a fibrous interface predominantly composed of type I collagen. Transplanted native cartilage grafts remain as inert structures within cartilage defects and fail to induce integrative cartilage repair which rather demands additional cells provided by additional bone marrow stimulation.
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Affiliation(s)
- Kolja Gelse
- Department of Orthopaedic Trauma Surgery, University Hospital Erlangen, Krankenhausstr. 12, 91054, Erlangen, Germany
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Mauck RL, Burdick JA. From repair to regeneration: biomaterials to reprogram the meniscus wound microenvironment. Ann Biomed Eng 2015; 43:529-42. [PMID: 25650096 DOI: 10.1007/s10439-015-1249-z] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Accepted: 01/09/2015] [Indexed: 12/20/2022]
Abstract
When the field of tissue engineering first arose, scaffolds were conceived of as inert three-dimensional structures whose primary function was to support cellularity and tissue growth. Since then, advances in scaffold and biomaterial design have evolved to not only guide tissue formation, but also to interact dynamically with and manipulate the wound environment. At present, these efforts are being directed towards strategies that directly address limitations in endogenous wound repair, with the goal of reprogramming the local wound environment (and the cells within that locality) from a state that culminates in an inferior tissue repair into a state in which functional regeneration is achieved. This review will address this approach with a focus on recent advances in scaffold design towards the resolution of tears of the knee meniscus as a case example. The inherent limitations to endogenous repair will be discussed, as will specific examples of how biomaterials are being designed to overcome these limitations. Examples will include design of fibrous scaffolds that promote colonization by modulating local extracellular matrix density and delivering recruitment factors. Furthermore, we will discuss scaffolds that are themselves modulated by the wound environment to alter porosity and modulate therapeutic release through precise coordination of scaffold degradation. Finally, we will close with emerging concepts in local control of cell mechanics to improve interstitial cell migration and so advance repair. Overall, these examples will illustrate how emergent features within a biomaterial can be tuned to manipulate and harness the local tissue microenvironment in order to promote robust regeneration.
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Affiliation(s)
- Robert L Mauck
- McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, Perelman School of Medicine, University of Pennsylvania, 424 Stemmler Hall, 36th Street and Hamilton Walk, Philadelphia, PA, 19104, USA,
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Functional cartilage repair capacity of de-differentiated, chondrocyte- and mesenchymal stem cell-laden hydrogels in vitro. Osteoarthritis Cartilage 2014; 22:1148-57. [PMID: 24887551 PMCID: PMC5398282 DOI: 10.1016/j.joca.2014.05.019] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2013] [Revised: 05/16/2014] [Accepted: 05/21/2014] [Indexed: 02/02/2023]
Abstract
OBJECTIVE The long-term performance of cell-seeded matrix-based cartilage constructs depends on (1) the development of sufficient biomechanical properties, and (2) lateral integration with host tissues, both of which require cartilage-specific matrix deposition within the scaffold. In this study, we have examined the potential of tissue-engineered cartilage analogs developed using different cell types, i.e., mesenchymal stem cells (MSCs) vs chondrocytes and de-differentiated chondrocytes, in an established "construct in cartilage ring" model. DESIGN Cell-laden constructs of differentiated chondrocytes, de-differentiated chondrocytes after two, five or eight population doublings, and MSCs were either implanted into a native cartilage ring immediately after fabrication (immature group) or pre-treated for 21 days in a transforming growth factor-β3 (TGF-β3) containing medium prior to implantation. After additional culture for 28 days in a serum-free, chemically defined medium, the extent of lateral integration, and biochemical and biomechanical characteristics of the implants as hybrid constructs were assessed. RESULTS The quality of integration, the amount of accumulated cartilage-specific matrix components and associated biomechanical properties were found to be highest when using differentiated chondrocytes. De-differentiation of chondrocytes negatively impacted the properties of the implants, as even two population doublings of the chondrocytes in culture significantly lowered cartilage repair capacity. In contrast, MSCs showed chondrogenic differentiation with TGF-β3 pre-treatment and superior integrational behavior. CONCLUSIONS Chondrocyte expansion and de-differentiation impaired the cell response, resulting in inferior cartilage repair in vitro. With TGF-β3 pre-treatment, MSCs were able to undergo sustained chondrogenic differentiation and exhibited superior matrix deposition and integration compared to de-differentiated chondrocytes.
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Repairing the osteochondral defect in goat with the tissue-engineered osteochondral graft preconstructed in a double-chamber stirring bioreactor. BIOMED RESEARCH INTERNATIONAL 2014; 2014:219203. [PMID: 25061604 PMCID: PMC4100384 DOI: 10.1155/2014/219203] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 04/28/2014] [Indexed: 11/17/2022]
Abstract
To investigate the reparative efficacy of tissue-engineered osteochondral (TEO) graft for repairing the osteochondral defect in goat, we designed a double-chamber stirring bioreactor to construct the bone and cartilage composites simultaneously in one β-TCP scaffold and observed the reparative effect in vivo. The osteochondral defects were created in goats and all the animals were divided into 3 groups randomly. In groups A, the defect was treated with the TEO which was cultured with mechanical stimulation of stir; in group B, the defect was treated with TEO which was cultured without mechanical stimulation of stir; in groups C, the defect was treated without TEO. At 12 weeks and 24 weeks after operation, the reparative effects in different groups were assessed and compared. The results indicated that the reparative effect of the TEO cultured in the bioreactor was better than the control group, and mechanical stimulation of stir could further improve the reparative effect. We provided a feasible and effective method to construct the TEO for treatment of osteochondral defect using autologous BMSCs and the double-chamber bioreactor.
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Yang YH, Ard MB, Halper JT, Barabino GA. Type I collagen-based fibrous capsule enhances integration of tissue-engineered cartilage with native articular cartilage. Ann Biomed Eng 2013; 42:716-26. [PMID: 24362632 DOI: 10.1007/s10439-013-0958-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Accepted: 12/04/2013] [Indexed: 11/29/2022]
Abstract
Successful integration of engineered constructs with host tissues is crucial for cartilage repair, yet achieving it remains challenging. A collagen I-based fibrous capsule characterized by increased cell density and decreased glycosaminoglycan deposition usually forms at the periphery of tissue-engineered cartilage. The current study aimed to evaluate the effects of a solid fibrous capsule on construct integration with native articular cartilage. To this end, capsule-containing (CC) and capsule-free (CF) constructs were grown by culturing chondrocyte-seeded scaffolds with insulin-like growth factor-1 and transforming growth factor-β1, respectively, in a wavy-walled bioreactor that imparts hydrodynamic forces for 4 weeks. The ability of harvested constructs to integrate with native cartilage was determined using a cartilage explant model. Our results revealed that adhesive stress between native cartilage and the CC constructs was 57% higher than that in the CF group, potentially due to the absence of glycosaminoglycans and increased cell density in the capsule region and deposition of denser and thicker collagen fibrils at the integration site. The present work demonstrates that the fibrous capsule can effectively enhance early integration of engineered and native cartilage tissues and thus suggests the need to include the capsule as a variable in the development of cartilage tissue engineering strategies.
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Affiliation(s)
- Yueh-Hsun Yang
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, 30332, USA
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31
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Allon AA, Ng KW, Hammoud S, Russell BH, Jones CM, Rivera JJ, Schwartz J, Hook M, Maher SA. Augmenting the articular cartilage-implant interface: Functionalizing with a collagen adhesion protein. J Biomed Mater Res A 2012; 100:2168-75. [PMID: 22615182 DOI: 10.1002/jbm.a.34144] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Revised: 01/12/2012] [Accepted: 01/25/2012] [Indexed: 11/11/2022]
Abstract
The lack of integration between implants and articular cartilage is an unsolved problem that negatively impacts the development of treatments for focal cartilage defects. Many approaches attempt to increase the number of matrix-producing cells that can migrate to the interface, which may help to reinforce the boundary over time but does not address the problems associated with an initially unstable interface. The objective of this study was to develop a bioadhesive implant to create an immediate bond with the extracellular matrix components of articular cartilage. We hypothesized that implant-bound collagen adhesion protein (CNA) would increase the interfacial strength between a poly(vinly alcohol) implant and an articular cartilage immediately after implantation, without preventing cell migration into the implant. By way of a series of in vitro immunohistochemical and mechanical experiments, we demonstrated that (i) free CNA can bind to articular cartilage, (ii) implant-bound CNA can bind to collagen type II and (iii) implants functionalized with CNA result in a fourfold increase in interfacial strength with cartilage relative to untreated implants at day zero. Of note, the interfacial strength significantly decreased after 21 days in culture, which may be an indication that the protein itself has lost its effectiveness. Our data suggest that functionalizing scaffolds with CNA may be a viable approach toward creating an initially stable interface between scaffolds and articular cartilage. Further efforts are required to ensure long-term interface stability.
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Affiliation(s)
- Aliza A Allon
- Hospital for Special Surgery, New York, New York, USA
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32
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Erickson IE, Kestle SR, Zellars KH, Dodge GR, Burdick JA, Mauck RL. Improved cartilage repair via in vitro pre-maturation of MSC-seeded hyaluronic acid hydrogels. Biomed Mater 2012; 7:024110. [PMID: 22455999 DOI: 10.1088/1748-6041/7/2/024110] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Functional repair of focal cartilage defects requires filling the space with neotissue that has compressive properties comparable to native tissue and integration with adjacent host cartilage. While poor integration is a common complication with current clinical treatments, reports of tissue engineering advances in the development of functional compressive properties rarely include analyses of their potential for integration. Our objective was thus to assess both the maturation and integration of mesenchymal stem cell (MSC)-laden hyaluronic acid (HA) hydrogels in an in vitro cartilage defect model. Furthermore, we considered the effects of an initial period of pre-maturation as well as various material formulations to maximize both construct compressive properties and integration strength. MSCs were encapsulated in 1%, 3% and 5% methacrylated HA (MeHA) or 2% agarose (Ag) and gelled directly (in situ) within an in vitro cartilage defect or were formed and then pre-cultured for 4 weeks before implantation. Results showed that the integration strength of pre-cultured repair constructs was equal to (1% MeHA) or greater than (2% Ag) the integration of in situ repaired cartilage. Moreover, MSC chondrogenesis and maturation was restricted by the in situ repair environment with constructs maturing to a much lesser extent than pre-matured constructs. These results indicate that construct pre-maturation may be an essential element of functional cartilage repair.
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Affiliation(s)
- Isaac E Erickson
- McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania, 424 Stemmler Hall, 36th Street and Hamilton Walk, Philadelphia, PA 19104, USA
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Theodoropoulos JS, De Croos JNA, Park SS, Pilliar R, Kandel RA. Integration of tissue-engineered cartilage with host cartilage: an in vitro model. Clin Orthop Relat Res 2011; 469:2785-95. [PMID: 21403985 PMCID: PMC3171526 DOI: 10.1007/s11999-011-1856-4] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND We developed a tissue-engineered biphasic cartilage bone substitute construct which has been shown to integrate with host cartilage and differs from autologous osteochondral transfer in which integration with host cartilage does not occur. QUESTIONS/PURPOSES (1) Develop a reproducible in vitro model to study the mechanisms regulating tissue-engineered cartilage integration with host cartilage, (2) compare the integrative properties of tissue-engineered cartilage with autologous cartilage and (3) determine if chondrocytes from the in-vitro formed cartilage migrate across the integration site. METHODS A biphasic construct was placed into host bovine osteochondral explant and cultured for up to 8 weeks (n = 6 at each time point). Autologous osteochondral implants served as controls (n = 6 at each time point). Integration was evaluated histologically, ultrastructurally, biochemically and biomechanically. Chondrocytes used to form cartilage in vitro were labeled with carboxyfluorescein diacetate which allowed evaluation of cell migration into host cartilage. RESULTS Histologic assessment demonstrated that tissue-engineered cartilage integrated over time, unlike autologous osteochondral implant controls. Biochemically there was an increase in collagen content of the tissue-engineered implant over time but was well below that for native cartilage. Integration strength increased between 4 and 8 weeks as determined by a pushout test. Fluorescent cells were detected in the host cartilage up to 1.5 mm from the interface demonstrating chondrocyte migration. CONCLUSIONS Tissue-engineered cartilage demonstrated improved integration over time in contrast to autologous osteochondral implants. Integration extent and strength increased with culture duration. There was chondrocyte migration from tissue-engineered cartilage to host cartilage. CLINICAL RELEVANCE This in vitro integration model will allow study of the mechanism(s) regulating cartilage integration. Understanding this process will facilitate enhancement of cartilage repair strategies for the treatment of chondral injuries.
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Affiliation(s)
- John S. Theodoropoulos
- Orthopedic Surgery, Mount Sinai Hospital, 600 University Avenue, Suite 476C, Toronto, M5G 1X5 Canada
| | - J. N. Amritha De Croos
- Department of Pathology and Laboratory Medicine, CIHR-BioEngineering of Skeletal Tissues Team, Mount Sinai Hospital, Toronto, Canada
| | - Sam S. Park
- Mount Sinai Hospital, 600 University Avenue, Suite 476C, Toronto, M5G 1X5 Canada
| | - Robert Pilliar
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Canada
| | - Rita A. Kandel
- Department of Pathology and Laboratory Medicine, CIHR-BioEngineering of Skeletal Tissues Team, Mount Sinai Hospital, Toronto, Canada ,Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Canada
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Vahdati A, Wagner DR. Finite element study of a tissue-engineered cartilage transplant in human tibiofemoral joint. Comput Methods Biomech Biomed Engin 2011; 15:1211-21. [PMID: 21809943 DOI: 10.1080/10255842.2011.585974] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Most tissue-engineered cartilage constructs are more compliant than native articular cartilage (AC) and are poorly integrated to the surrounding tissue. To investigate the effect of an implanted tissue-engineered construct (TEC) with these inferior properties on the mechanical environment of both the engineered and adjacent native tissues, a finite element study was conducted. Biphasic swelling was used to model tibial cartilage and an implanted TEC with the material properties of either native tissue or a decreased elastic modulus and fixed charged density. Creep loading was applied with a rigid impermeable indenter that represented the femur. In comparison with an intact joint, compressive strains in the transplant, surface contact stress in the adjacent native AC and load partitioning between different phases of cartilage were affected by inferior properties of TEC. Results of this study may lead to a better understanding of the complex mechanical environment of an implanted TEC.
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Affiliation(s)
- Ali Vahdati
- Bioengineering Graduate Program, Aerospace and Mechanical Engineering Department, University of Notre Dame, Notre Dame, IN, USA
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35
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Chew SL, Wang K, Chai SP, Goh KL. Elasticity, thermal stability and bioactivity of polyhedral oligomeric silsesquioxanes reinforced chitosan-based microfibres. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2011; 22:1365-1374. [PMID: 21505828 DOI: 10.1007/s10856-011-4318-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2011] [Accepted: 04/06/2011] [Indexed: 05/30/2023]
Abstract
A wet-spinning approach was used to extrude ribbon-like micrometer-thick fibres comprising chitosan with 1, 3, 5, 7 and 9% (w/w) polyhedral oligomeric silsesquioxanes (POSS). ANOVA reveals significant variations in the maximum stress (σ), stiffness (E), elastic energy storage (u') and fracture toughness (u) of the microfibres with respect to POSS concentration: σ, u' and u peak at 7% (w/w) but POSS concentration has no effect on E. Scanning electron microscopy of the ruptured microfibres reveals fracture and detachment of POSS precipitates from the chitosan matrix. Bioactivity test using simulated body fluids reveals a net gain in mass (by day 4) and grossly distorted morphology caused by apatite deposition on the microfibre surface. Fourier transform infrared spectroscopy reveals that chitin is partially deacetylated into chitosan and it further shows the presence of POSS in the microfibres. Thermogravimetric analysis shows that the microfibres are thermally stable up to 240°C in a nitrogen atmosphere.
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Affiliation(s)
- S L Chew
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637457, Singapore
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36
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Scotti C, Wirz D, Wolf F, Schaefer DJ, Bürgin V, Daniels AU, Valderrabano V, Candrian C, Jakob M, Martin I, Barbero A. Engineering human cell-based, functionally integrated osteochondral grafts by biological bonding of engineered cartilage tissues to bony scaffolds. Biomaterials 2010; 31:2252-9. [PMID: 20022102 DOI: 10.1016/j.biomaterials.2009.11.110] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2009] [Accepted: 11/29/2009] [Indexed: 11/27/2022]
Abstract
In this study, we aimed at developing and validating a technique for the engineering of osteochondral grafts based on the biological bonding of a chondral layer with a bony scaffold by cell-laid extracellular matrix. Osteochondral composites were generated by combining collagen-based matrices (Chondro-Gide) containing human chondrocytes with devitalized spongiosa cylinders (Tutobone) using a fibrin gel (Tisseel). We demonstrate that separate pre-culture of the chondral layer for 3 days prior to the generation of the composite allows for (i) more efficient cartilaginous matrix accumulation than no pre-culture, as assessed histologically and biochemically, and (ii) superior biological bonding to the bony scaffold than 14 days of pre-culture, as assessed using a peel-off mechanical test, developed to measure integration of bilayered materials. The presence of the bony scaffold induced an upregulation in the infiltrated cells of the osteoblast-related gene bone sialoprotein, indicative of the establishment of a gradient of cell phenotypes, but did not affect per se the quality of the cartilaginous matrix in the chondral layer. The described strategy to generate osteochondral plugs is simple to be implemented and--since it is based on clinically compliant cells and materials--is amenable to be readily tested in the clinic.
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Affiliation(s)
- Celeste Scotti
- Department of Surgery, University Hospital Basel, Basel, Switzerland
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Maher SA, Mauck RL, Rackwitz L, Tuan RS. A nanofibrous cell-seeded hydrogel promotes integration in a cartilage gap model. J Tissue Eng Regen Med 2010; 4:25-9. [PMID: 19834956 DOI: 10.1002/term.205] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The presence of a defect in mature articular cartilage can lead to degenerative changes of the joint. This is in part caused by the inability of cartilage to regenerate tissue that is capable of spanning a fissure or crack. In this study, we hypothesized that introduction of a biodegradable cell-seeded nanofibrous hydrogel, Puramatrix(), into a cartilage gap would facilitate the generation of a mechanically stable interface. The effects of chondrocyte incorporation within the hydrogel and supplementation with transforming growth factor-beta3 (TGFbeta3), a known regulator of cell growth and differentiation, on cartilage integration were examined mechanically and histologically as a function of cell density and incubation time. When supplemented with TGFbeta3, the cell-seeded hydrogel exhibited abundant matrix generation within the hydrogel and a corresponding increase in maximum push-out stress as compared to all other groups. Furthermore, initial cell seeding density affected interfacial strength in a time-dependent manner. This study suggests that a cell-seeded TGFbeta3-supplemented hydrogel can encourage integration between two opposing pieces of articular cartilage.
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Affiliation(s)
- S A Maher
- Hospital for Special Surgery, New York, NY 10021, USA.
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38
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Gilbert SJ, Singhrao SK, Khan IM, Gonzalez LG, Thomson BM, Burdon D, Duance VC, Archer CW. Enhanced tissue integration during cartilage repair in vitro can be achieved by inhibiting chondrocyte death at the wound edge. Tissue Eng Part A 2009; 15:1739-49. [PMID: 19119922 DOI: 10.1089/ten.tea.2008.0361] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVE Experimental wounding of articular cartilage results in cell death at the lesion edge. The objective of this study was to investigate whether inhibition of this cell death results in enhanced integrative cartilage repair. METHODS Bovine articular cartilage discs (6 mm) were incubated in media containing inhibitors of necrosis (Necrostatin-1, Nec-1) or apoptosis (Z-VAD-FMK, ZVF) before cutting a 3 mm inner core. This core was left in situ to create disc/ring composites, cultured for up to 6 weeks with the inhibitors, and analyzed for cell death, sulfated glycosaminoglycan release, and tissue integration. RESULTS Creating the disc/ring composites resulted in a significant increase in necrosis. ZVF significantly reduced necrosis and apoptosis at the wound edge. Nec-1 reduced necrosis. Both inhibitors reduced the level of wound-induced sulfated glycosaminoglycan loss. Toluidine blue staining and electron microscopy of cartilage revealed significant integration of the wound edges in disc/ring composites treated with ZVF. Nec-1 improved integration, but to a lesser extent. Push-out testing revealed that ZVF increased adhesive strength compared to control composites. CONCLUSIONS This study shows that treatment of articular cartilage with cell death inhibitors during wound repair increases the number of viable cells at the wound edge, prevents matrix loss, and results in a significant improvement in cartilage-cartilage integration.
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Affiliation(s)
- Sophie J Gilbert
- Connective Tissue Biology Laboratories, School of Biosciences, Cardiff University, Cardiff, Wales, United Kingdom.
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Vinardell T, Thorpe SD, Buckley CT, Kelly DJ. Chondrogenesis and Integration of Mesenchymal Stem Cells Within an In Vitro Cartilage Defect Repair Model. Ann Biomed Eng 2009; 37:2556-65. [DOI: 10.1007/s10439-009-9791-1] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2009] [Accepted: 08/31/2009] [Indexed: 12/31/2022]
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Hadjipanayi E, Brown RA, Mudera V. Interface integration of layered collagen scaffolds with defined matrix stiffness: implications for sheet-based tissue engineering. J Tissue Eng Regen Med 2009; 3:230-41. [PMID: 19274679 DOI: 10.1002/term.157] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Successful application of sheet-based engineering for complex tissue reconstruction requires optimal integration of construct components. An important regulator of cellular responses (such as migration and collagen deposition) mediating interface integration is matrix stiffness. In this study we developed a sheet-based 3D model of interface integration that allows control of interface matrix stiffness. Fluid was removed from acellular or fibroblast-seeded bilayer collagen hydrogel constructs, using plastic compression to increase collagen density and matrix stiffness. Cell-seeded constructs were either compressed at day 0 and cultured for 7 days (compressed culture, high stiffness) or left uncompressed during culture and compressed on day 7 (compliant-compressed culture, low stiffness). Constructs were fitted onto a mechanical testing system to measure interface adhesive strength. Analysis of stresses by finite element modelling predicted a sharp rise of stress and rapid failure at the interface. While cell-seeded constructs showed a six-fold increase in interface adhesive strength compared to acellular control constructs (p < 0.05), there was no significant difference between low- and high-stiffness cultures after 1 week. Cell migration across the interface was greater in low- compared to high-stiffness constructs at 24 h (p < 0.05); however, no significant difference was observed after 1 week. Visualization of interfaces showed fusion of the two layers in low- but not in high-stiffness constructs after 1 week of culture. The ability to regulate cellular behaviour at an interface by controlling matrix stiffness could provide an important tool for modelling the integration of sheet-based bioengineered tissues in bioreactor culture or post-implantation.
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Affiliation(s)
- E Hadjipanayi
- University College London Tissue Repair and Engineering Centre, Division of Surgical and Interventional Sciences, Institute of Orthopaedics and Musculoskeletal Sciences, London, UK
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Analysis of radial variations in material properties and matrix composition of chondrocyte-seeded agarose hydrogel constructs. Osteoarthritis Cartilage 2009; 17:73-82. [PMID: 18805027 PMCID: PMC2821566 DOI: 10.1016/j.joca.2008.05.019] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2007] [Accepted: 05/23/2008] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To examine the radial variations in engineered cartilage that may result due to radial fluid flow during dynamic compressive loading. This was done by evaluating the annuli and the central cores of the constructs separately. METHOD Chondrocyte-seeded agarose hydrogels were grown in free-swelling and dynamic, unconfined loading cultures for 42 days. After mechanical testing, constructs were allowed to recover for 1-2h, the central 3mm cores removed, and the cores and annuli were retested separately. Histological and/or biochemical analyses for DNA, glycosaminoglycan (GAG), collagen, type I collagen, type II collagen, and elastin were performed. Multiple regression analysis was used to determine the correlation between the biochemical and material properties of the constructs. RESULTS The cores and annuli of chondrocyte-seeded constructs did not exhibit significant differences in material properties and GAG content. Annuli possessed greater DNA and collagen content over time in culture than cores. Dynamic loading enhanced the material properties and GAG content of cores, annuli, and whole constructs relative to free-swelling controls, but it did not alter the radial variations compared to free-swelling culture. CONCLUSION Surprisingly, the benefits of dynamic loading on tissue properties extended through the entire construct and did not result in radial variations as measured via the coring technique in this study. Nutrient transport limitations and the formation of a fibrous capsule on the periphery may explain the differences in DNA and collagen between cores and annuli. No differences in GAG distribution may be due to sufficient chemical signals and building blocks for GAG synthesis throughout the constructs.
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Rice MA, Homier PM, Waters KR, Anseth KS. Effects of directed gel degradation and collagenase digestion on the integration of neocartilage produced by chondrocytes encapsulated in hydrogel carriers. J Tissue Eng Regen Med 2008; 2:418-29. [DOI: 10.1002/term.113] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Hennerbichler A, Moutos FT, Hennerbichler D, Weinberg JB, Guilak F. Interleukin-1 and tumor necrosis factor alpha inhibit repair of the porcine meniscus in vitro. Osteoarthritis Cartilage 2007; 15:1053-60. [PMID: 17448702 PMCID: PMC3217205 DOI: 10.1016/j.joca.2007.03.003] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/07/2006] [Accepted: 03/03/2007] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Injury or removal of the knee meniscus leads to progressive joint degeneration, and current surgical therapies for meniscal tears seek to maximally preserve meniscal structure and function. However, the factors that influence intrinsic repair of the meniscus are not well understood. The goal of this study was to investigate the capacity of meniscus tissue to repair a simulated defect in vitro and to examine the effect of pro-inflammatory cytokines on this process. METHODS Cylindrical explants were harvested from the outer one-third of medial porcine menisci. To simulate a full-thickness defect, a central core was removed and reinserted immediately into the defect. Explants were cultured for 2, 4, or 6 weeks in serum-containing media in the presence or absence of interleukin-1 (IL-1) or tumor necrosis factor alpha (TNF-alpha), and meniscal repair was investigated using mechanical testing and fluorescence confocal microscopy. RESULTS Meniscal lesions in untreated samples showed a significant capacity for intrinsic repair in vitro, with increasing cell accumulation and repair strength over time in culture. In the presence of IL-1 or TNF-alpha, no repair was observed despite the presence of abundant viable cells. CONCLUSIONS This study demonstrates that the meniscus exhibits an intrinsic repair response in vitro. However, the presence of pro-inflammatory cytokines completely inhibited repair. These findings suggest that increased levels of pro-inflammatory cytokines post-injury or under arthritic conditions may inhibit meniscal repair. Therefore, inhibition of these cytokines may provide a means of accelerating repair of damaged or injured menisci in vivo.
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Affiliation(s)
- Alfred Hennerbichler
- Department of Surgery, Division of Orthopaedic Surgery, Duke University Medical Center, Durham, NC 27710, U.S.A
- Department of Trauma Surgery and Sports Medicine Innsbruck Medical University, A-6020 Innsbruck, Austria
| | - Franklin T. Moutos
- Department of Surgery, Division of Orthopaedic Surgery, Duke University Medical Center, Durham, NC 27710, U.S.A
| | - Diana Hennerbichler
- Department of Surgery, Division of Orthopaedic Surgery, Duke University Medical Center, Durham, NC 27710, U.S.A
| | - J. Brice Weinberg
- Department of Medicine VA and Duke Medical Centers, Durham, NC 27705, U.S.A
| | - Farshid Guilak
- Department of Surgery, Division of Orthopaedic Surgery, Duke University Medical Center, Durham, NC 27710, U.S.A
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Englert C, Fierlbeck J, von Glasser SS, Nerlich M, Hammer J. Mechanical characteristics of articular cartilage bonds. Clin Biomech (Bristol, Avon) 2007; 22:849-55. [PMID: 17570569 DOI: 10.1016/j.clinbiomech.2007.04.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2006] [Revised: 04/07/2007] [Accepted: 04/24/2007] [Indexed: 02/07/2023]
Abstract
BACKGROUND Sutures for adaptation of articular cartilage are used in arthritis therapy techniques. However, little is known about the mechanical functionality of these sutures. The objective of the present work was to compare the mechanical properties of articular cartilage bonds either generated by suture, or, alternatively, by chemical cross-linking of the opposing surfaces or in vitro integrative repair of cartilage blocks. METHODS Bonding was achieved by suture in varying numbers, positions and orientations, by surface cross-linking using carbodiimide in combination with pepsin or guanidine (immediate bonding), or by cultivation for 14 days, either with or without testosterone. The mechanical properties of the cartilage bonds were measured under tensile loading. FINDINGS Suture led to the highest maximal load at failure and by far to the highest strain and lowest stiffness of the bonded samples. Immediate bonding by chemical cross-linking in combination with pepsin led to a low force at failure, but the highest stiffness, as compared to all other groups. Cultivation in the presence of testosterone led to a higher force at failure and a higher strain than chemical cross-linking. INTERPRETATION Suture technique for bonding of cartilage surfaces leads to a very elastic adaptation which allows synovial fluid flow in between the interface of cartilage wounds. Long-term bonding of cartilage wounds would be counteracted by a fluid flow through the interface during motion of the joint. Immediate bonding of cartilage wounds by chemical cross-linking reagents might be a useful alternative tool. Even more promising, with regard to the mechanical properties, appears to be integrative repair of cartilage blocks stimulated by testosterone.
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Affiliation(s)
- Carsten Englert
- Department of Trauma Surgery, Regensburg University Medical Center, Franz-Josef-Strauss-Allee 11, 93053 Regensburg, Germany.
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Hennerbichler A, Moutos FT, Hennerbichler D, Weinberg JB, Guilak F. Repair response of the inner and outer regions of the porcine meniscus in vitro. Am J Sports Med 2007; 35:754-62. [PMID: 17261570 DOI: 10.1177/0363546506296416] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND The menisci are essential intra-articular structures that contribute to knee function, and meniscal injury or loss is associated with joint degeneration. Tears of the outer vascularized zone have a greater potential for repair than do tears in the inner avascular region. OBJECTIVE AND HYPOTHESIS Develop an in vitro explant model to examine the hypothesis that differences exist in the intrinsic repair response between the outer and inner region of the meniscus. STUDY DESIGN Controlled laboratory study. METHODS Cylindrical explants were harvested from the outer one third and inner two thirds of medial porcine menisci. To simulate a full-thickness defect, a central core was removed and reinserted immediately. Explants were cultured for 2, 4, or 6 weeks, and meniscal healing was investigated using mechanical testing, histologic analysis, and fluorescence confocal microscopy. RESULTS Over the 6-week culture period, meniscal explants exhibited migration of cells into the repair site, followed by increased tissue formation that bridged the interface. The repair strength increased significantly over time, with no differences between the 2 regions. CONCLUSION The findings show that explants from the avascular inner zone and vascular outer zone of the meniscus exhibit similar healing potential and repair strength in vitro. CLINICAL RELEVANCE These findings support the hypothesis that the regional differences in meniscal repair observed clinically are owed to the additional vascular supply of the outer meniscus rather than intrinsic differences between the extracellular matrix and cells from these 2 areas.
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Affiliation(s)
- Alfred Hennerbichler
- Department of Surgery, Division of Orthopaedic Surgery, Duke University Medical Center, Durham, North Carolina 27710, USA
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Martin I, Miot S, Barbero A, Jakob M, Wendt D. Osteochondral tissue engineering. J Biomech 2006; 40:750-65. [PMID: 16730354 DOI: 10.1016/j.jbiomech.2006.03.008] [Citation(s) in RCA: 287] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2006] [Accepted: 03/13/2006] [Indexed: 11/23/2022]
Abstract
Osteochondral defects (i.e., defects which affect both the articular cartilage and underlying subchondral bone) are often associated with mechanical instability of the joint, and therefore with the risk of inducing osteoarthritic degenerative changes. Current surgical limits in the treatment of complex joint lesions could be overcome by grafting osteochondral composite tissues, engineered by combining the patient's own cells with three-dimensional (3D) porous biomaterials of pre-defined size and shape. Various strategies have been reported for the engineering of osteochondral composites, which result from the use of one or more cell types cultured into single-component or composite scaffolds in a broad spectrum of compositions and biomechanical properties. The variety of concepts and models proposed by different groups for the generation of osteochondral grafts reflects that understanding of the requirements to restore a normal joint function is still poor. In order to introduce the use of engineered osteochondral composites in the routine clinical practice, it will be necessary to comprehensively address a number of critical issues, including those related to the size and shape of the graft to be generated, the cell type(s) and properties of the scaffold(s) to be used, the potential physical conditioning to be applied, the degree of functionality required, and the strategy for a cost-effective manufacturing. The progress made in material science, cell biology, mechanobiology and bioreactor technology will be key to support advances in this challenging field.
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Affiliation(s)
- Ivan Martin
- Department of Research and Institute for Surgical Research and Hospital Management, University Hospital of Basel, Hebelstrasse 20, 4031 Basel, Switzerland.
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Tognana E, Padera RF, Chen F, Vunjak-Novakovic G, Freed LE. Development and remodeling of engineered cartilage-explant composites in vitro and in vivo. Osteoarthritis Cartilage 2005; 13:896-905. [PMID: 16019238 DOI: 10.1016/j.joca.2005.05.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2004] [Accepted: 05/04/2005] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Development and remodeling of engineered cartilage-explant composites were studied in vitro and in vivo. DESIGN Individual and interactive effects of cell chondrogenic potential (primary or fifth passage bovine calf chondrocytes), scaffold degradation rate (hyaluronan benzyl ester or polyglycolic acid), and adjacent tissue cell activity and architecture (vital trabecular bone (VB), articular cartilage (AC), devitalized bone (DB) or digested cartilage (DC)) were evaluated over 8 weeks in vitro (bioreactor cultures) and in vivo (ectopic implants). RESULTS In vitro, significant effects of cell type on construct adhesive strength (P<0.001) and scaffold type on adhesive strength (P<0.001), modulus (P=0.014), glycosaminoglycans (GAG) (P<0.001), and collagen (P=0.039) were observed. Chondrogenesis was best when the scaffold degradation rate matched the extracellular matrix deposition rate. In vivo, adjacent tissue type affected adhesive strength (P<0.001), modulus (P<0.001), and GAG (P<0.001) such that 8-week values obtained for bone (VB and DB) were higher than for cartilage (AC). In the AC/construct group, chondrogenesis appeared attenuated in the region of the construct close to the AC. In contrast, in the VB/construct group, a 500 microm thick zone of mature hyaline-like cartilage formed at the interface, and signs of active remodeling were present in the bone that included osteoclastic and osteoblastic activity and trabecular rebuttressing; these features were not present in the DB group or in vitro. CONCLUSIONS Development and remodeling of composites based on engineered cartilage were mediated in vitro by cell chondrogenic potential and scaffold degradation rate, and in vivo by type of adjacent tissue and time.
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Affiliation(s)
- Enrico Tognana
- Division of Health Sciences and Technology, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
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