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Lin CC, Frahm E, Afolabi FO. Orthogonally Crosslinked Gelatin-Norbornene Hydrogels for Biomedical Applications. Macromol Biosci 2024; 24:e2300371. [PMID: 37748778 PMCID: PMC10922053 DOI: 10.1002/mabi.202300371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 09/19/2023] [Indexed: 09/27/2023]
Abstract
The thiol-norbornene photo-click reaction has exceptionally fast crosslinking efficiency compared with chain-growth polymerization at equivalent macromer contents. The orthogonal reactivity between norbornene and thiol/tetrazine permits crosslinking of synthetic and naturally derived macromolecules with modularity, including poly(ethylene glycol) (PEG)-norbornene (PEGNB), gelatin-norbornene (GelNB), among others. For example, collagen-derived gelatin contains both cell adhesive motifs (e.g., Arg-Gly-Asp or RGD) and protease-labile sequences, making it an ideal macromer for forming cell-laden hydrogels. First reported in 2014, GelNB is increasingly used in orthogonal crosslinking of biomimetic matrices in various applications. GelNB can be crosslinked into hydrogels using multi-functional thiol linkers (e.g., dithiothreitol (DTT) or PEG-tetra-thiol (PEG4SH) via visible light or longwave ultraviolet (UV) light step-growth thiol-norbornene reaction or through an enzyme-mediated crosslinking (i.e., horseradish peroxidase, HRP). GelNB-based hydrogels can also be modularly crosslinked with tetrazine-bearing macromers via inverse electron-demand Diels-Alder (iEDDA) click reaction. This review surveys the various methods for preparing GelNB macromers, the crosslinking mechanisms of GelNB-based hydrogels, and their applications in cell and tissue engineering, including crosslinking of dynamic matrices, disease modeling, and tissue regeneration, delivery of therapeutics, as well as bioprinting and biofabrication.
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Affiliation(s)
- Chien-Chi Lin
- Department of Biomedical Engineering, Purdue School of Engineering & Technology, Indiana University-Purdue University Indianapolis, Indianapolis, IN. 46202. USA
| | - Ellen Frahm
- Department of Biomedical Engineering, Purdue School of Engineering & Technology, Indiana University-Purdue University Indianapolis, Indianapolis, IN. 46202. USA
| | - Favor O. Afolabi
- Department of Biomedical Engineering, Purdue School of Engineering & Technology, Indiana University-Purdue University Indianapolis, Indianapolis, IN. 46202. USA
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2
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Guo M, Ban T, Wang Y, Wang X, Zhu X. "Thiol-ene" crosslinked polybenzimidazoles anion exchange membrane with enhanced performance and durability. J Colloid Interface Sci 2023; 638:349-362. [PMID: 36746053 DOI: 10.1016/j.jcis.2023.01.137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 01/20/2023] [Accepted: 01/28/2023] [Indexed: 02/04/2023]
Abstract
To address the "trade-off" between conductivity and stability of anion exchange membranes (AEMs), we developed a series of crosslinked AEMs by using polybenzimidazole with norbornene (cPBI-Nb) as backbone and the crosslinked structure was fabricated by adopting click chemical between thiol and vinyl-group. Meanwhile, the hydrophilic properties of the dithiol cross-linker were regulated to explore the effect for micro-phase separation morphology and hydroxide ion conductivity. As result, the AEMs with hydrophilic crosslinked structure (PcPBI-Nb-C2) not only had apparent micro-phase separation morphology and high OH- conductivity of 105.54 mS/cm at 80 °C, but also exhibited improved mechanical properties, dimensional stability (swelling ratio < 15%) and chemical stability (90.22 % mass maintaining in Fenton's reagent at 80 °C for 24 h, 78.30 % conductivity keeping in 2 M NaOH at 80 °C for 2016 h). In addition, the anion exchange membranes water electrolysis (AEMWEs) using PcPBI-Nb-C2 as AEMs achieved the current density of 368 mA/cm2 at 2.1 V and the durability over 500 min operated at 150 mA/cm2 under 60 °C. Therefore, this work paves the way for constructing AEMs by introduction of norbornene into polybenzimidazole and formation of hydrophilic crosslinked structure based on "thiol-ene".
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Affiliation(s)
- Maolian Guo
- State Key Lab of Fine Chemicals, Department of Polymer Science & Materials, Dalian University of Technology, Dalian 116024, China
| | - Tao Ban
- State Key Lab of Fine Chemicals, Department of Polymer Science & Materials, Dalian University of Technology, Dalian 116024, China
| | - Yajie Wang
- State Key Lab of Fine Chemicals, Department of Polymer Science & Materials, Dalian University of Technology, Dalian 116024, China
| | - Xinxin Wang
- State Key Lab of Fine Chemicals, Department of Polymer Science & Materials, Dalian University of Technology, Dalian 116024, China
| | - Xiuling Zhu
- State Key Lab of Fine Chemicals, Department of Polymer Science & Materials, Dalian University of Technology, Dalian 116024, China.
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Laurano R, Boffito M, Cassino C, Midei L, Pappalardo R, Chiono V, Ciardelli G. Thiol-Ene Photo-Click Hydrogels with Tunable Mechanical Properties Resulting from the Exposure of Different -Ene Moieties through a Green Chemistry. MATERIALS (BASEL, SWITZERLAND) 2023; 16:2024. [PMID: 36903139 PMCID: PMC10004734 DOI: 10.3390/ma16052024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 02/20/2023] [Accepted: 02/25/2023] [Indexed: 06/18/2023]
Abstract
Temperature and light responsiveness are widely exploited stimuli to tune the physico-chemical properties of double network hydrogels. In this work, new amphiphilic poly(ether urethane)s bearing photo-sensitive moieties (i.e., thiol, acrylate and norbornene functionalities) were engineered by exploiting the versatility of poly(urethane) chemistry and carbodiimide-mediated green functionalization procedures. Polymers were synthesized according to optimized protocols maximizing photo-sensitive group grafting while preserving their functionality (approx. 1.0 × 1019, 2.6 × 1019 and 8.1 × 1017 thiol, acrylate and norbornene groups/gpolymer), and exploited to prepare thermo- and Vis-light-responsive thiol-ene photo-click hydrogels (18% w/v, 1:1 thiol:ene molar ratio). Green light-induced photo-curing allowed the achievement of a much more developed gel state with improved resistance to deformation (ca. 60% increase in critical deformation, γL). Triethanolamine addition as co-initiator to thiol-acrylate hydrogels improved the photo-click reaction (i.e., achievement of a better-developed gel state). Differently, L-tyrosine addition to thiol-norbornene solutions slightly hindered cross-linking, resulting in less developed gels with worse mechanical performances (~62% γL decrease). In their optimized composition, thiol-norbornene formulations resulted in prevalent elastic behavior at lower frequency compared to thiol-acrylate gels due to the formation of purely bio-orthogonal instead of heterogeneous gel networks. Our findings highlight that exploiting the same thiol-ene photo-click chemistry, a fine tuning of the gel properties is possible by reacting specific functional groups.
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Affiliation(s)
- Rossella Laurano
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Turin, Italy
| | - Monica Boffito
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Turin, Italy
| | - Claudio Cassino
- Department of Science and Technological Innovation, Università del Piemonte Orientale, 15121 Alessandria, Italy
| | - Ludovica Midei
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Turin, Italy
| | - Roberta Pappalardo
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Turin, Italy
- Department of Surgical Sciences, Università degli Studi di Torino, 10126 Turin, Italy
| | - Valeria Chiono
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Turin, Italy
| | - Gianluca Ciardelli
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Turin, Italy
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Kim MH, Lin CC. Poly(ethylene glycol)-Norbornene as a Photoclick Bioink for Digital Light Processing 3D Bioprinting. ACS APPLIED MATERIALS & INTERFACES 2023; 15:2737-2746. [PMID: 36608274 DOI: 10.1021/acsami.2c20098] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Digital light processing (DLP) bioprinting is an emerging technology for three-dimensional bioprinting (3DBP) owing to its high printing fidelity, fast fabrication speed, and higher printing resolution. Low-viscosity bioinks such as poly(ethylene glycol) diacrylate (PEGDA) are commonly used for DLP-based bioprinting. However, the cross-linking of PEGDA proceeds via chain-growth photopolymerization that displays significant heterogeneity in cross-linking density. In contrast, step-growth thiol-norbornene photopolymerization is not oxygen inhibited and produces hydrogels with an ideal network structure. The high cytocompatibility and rapid gelation of thiol-norbornene photopolymerization have lent itself to the cross-linking of cell-laden hydrogels but have not been extensively used for DLP bioprinting. In this study, we explored eight-arm PEG-norbornene (PEG8NB) as a bioink/resin for visible light-initiated DLP-based 3DBP. The PEG8NB-based DLP resin showed high printing fidelity and cytocompatibility even without the use of any bioactive motifs and high initial stiffness. In addition, we demonstrated the versatility of the PEGNB resin by printing solid structures as cell culture devices, hollow channels for endothelialization, and microwells for generating cell spheroids. This work not only expands the selection of bioinks for DLP-based 3DBP but also provides a platform for dynamic modification of the bioprinted constructs.
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Affiliation(s)
- Min Hee Kim
- Department of Biomedical Engineering, Purdue School of Engineering & Technology, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, United States
- Department of Biomedical Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Chien-Chi Lin
- Department of Biomedical Engineering, Purdue School of Engineering & Technology, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, United States
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Zhang B, Qin L, Fang Y, Chai Y, Xie X, Lu B, Liang S, Zhou J. Tuning Zn2+ coordination tunnel by hierarchical gel electrolyte for dendrite-free zinc anode. Sci Bull (Beijing) 2022; 67:955-962. [DOI: 10.1016/j.scib.2022.01.027] [Citation(s) in RCA: 79] [Impact Index Per Article: 39.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 11/02/2021] [Accepted: 01/19/2022] [Indexed: 12/27/2022]
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Kim MH, Lin CC. Norbornene-functionalized methylcellulose as a thermo- and photo-responsive bioink. Biofabrication 2021; 13:10.1088/1758-5090/ac24dc. [PMID: 34496360 PMCID: PMC8593879 DOI: 10.1088/1758-5090/ac24dc] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Accepted: 09/08/2021] [Indexed: 02/06/2023]
Abstract
Three-dimensional (3D) bioprinting has emerged as an important tool to fabricate scaffolds with complex structures for tissue engineering and regenerative medicine applications. For extrusion-based 3D bioprinting, the success of printing complex structures relies largely on the properties of bioink. Methylcellulose (MC) has been exploited as a potential bioink for 3D bioprinting due to its temperature-dependent rheological properties. However, MC is highly soluble and has low structural stability at room temperature, making it suboptimal for 3D bioprinting applications. In this study, we report a one-step synthesis protocol for modifying MC with norbornene (MCNB), which serves as a new bioink for 3D bioprinting. MCNB preserves the temperature-dependent reversible sol-gel transition and readily reacts with thiol-bearing linkers through light-mediated step-growth thiol-norbornene photopolymerization. Furthermore, we rendered the otherwise inert MC network bioactive through facile conjugation of integrin-binding ligands (e.g. CRGDS) or via incorporating cell-adhesive and protease-sensitive gelatin-based macromer (e.g. GelNB). The adaptability of the new MCNB-based bioink offers an attractive option for diverse 3D bioprinting applications.
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Affiliation(s)
- Min Hee Kim
- Department of Biomedical Engineering, Purdue School of Engineering & Technology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA
| | - Chien-Chi Lin
- Department of Biomedical Engineering, Purdue School of Engineering & Technology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA
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Peng Y, Wang Z, Peña J, Guo Z, Xing J. Effect of TEOA on the Process of Photopolymerization at 532 nm and Properties of Nanogels. Photochem Photobiol 2021; 98:132-140. [PMID: 34390000 DOI: 10.1111/php.13505] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 08/11/2021] [Indexed: 11/29/2022]
Abstract
Nanogel is an important kind of biomaterials applied for wound dressings, drug delivery, medical diagnostics and biosensors. The properties of nanogels closely depend on the density of the crosslinking network. In this study, the role of triethanolamine (TEOA) in the effect on the crosslinking degree of nanogels based on poly(ethylene glycol) diacrylate (PEGDA) was investigated and illustrated. The effect of TEOA on the process of photopolymerization at 532 nm and properties of the nanogels was systematically investigated by using UV-vis spectroscopy, FT-IR spectroscopy, 1 H NMR, DLS, SEM, AFM and DSC. In brief, the double bond conversion of photopolymerization and the crosslinking degree of nanogels can be effectively regulated by TEOA.
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Affiliation(s)
- Yuanyuan Peng
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China
| | - Zhipeng Wang
- Tianjin Institute of Metrological Supervision and Testing, Tianjin, 300192, China
| | - Jhair Peña
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China
| | - Zhiming Guo
- Tianjin Institute of Metrological Supervision and Testing, Tianjin, 300192, China
| | - Jinfeng Xing
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China
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8
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Kim MH, Lin CC. Assessing monocyte phenotype in poly(γ-glutamic acid) hydrogels formed by orthogonal thiol–norbornene chemistry. Biomed Mater 2021; 16. [DOI: 10.1088/1748-605x/ac01b0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Accepted: 05/14/2021] [Indexed: 11/11/2022]
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9
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Wang Y, Shi Z, Sun Y, Wu X, Li S, Dong S, Lan T. Preparation of amphiphilic magnetic polyvinyl alcohol targeted drug carrier and drug delivery research. Des Monomers Polym 2020; 23:197-206. [PMID: 33177950 PMCID: PMC7594732 DOI: 10.1080/15685551.2020.1837442] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Currently, magnetic applications have great potential for development in the field of drug carriers. In this paper, Fe3O4-PVA@SH, an amphiphilic magnetically targeting drug carrier, was prepared by using Fe3O4 and PVA with thiohydrazide-iminopropyltriethoxysilane(TIPTS). The loading capacity of Fe3O4-PVA@SH on Aspirin and the drug release kinetics of loaded drugs were studied. The obtained Fe3O4-PVA@SH exhibits excellent drug release properties in simulating the human body fluid environment (pH 7.2). Since magnetically targeting drug carriers are readily available and have excellent biocompatibility and the characteristics of drug release. This work’s development, preparing amphiphilic magnetically targeting drug carriers in drug delivery and other fields, has great significance.
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Affiliation(s)
- Yazhen Wang
- College of Materials Science and Engineering, Qiqihar University, Qiqihar, China.,Heilongjiang Provincial Key Laboratory of Polymeric Composite Materials, Qiqihar, China.,College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin, China
| | - Zhen Shi
- College of Materials Science and Engineering, Qiqihar University, Qiqihar, China.,Heilongjiang Provincial Key Laboratory of Polymeric Composite Materials, Qiqihar, China
| | - Yu Sun
- Heilongjiang Provincial Key Laboratory of Polymeric Composite Materials, Qiqihar, China
| | - Xueying Wu
- Heilongjiang Provincial Key Laboratory of Polymeric Composite Materials, Qiqihar, China
| | - Shuang Li
- Heilongjiang Provincial Key Laboratory of Polymeric Composite Materials, Qiqihar, China
| | - Shaobo Dong
- Heilongjiang Provincial Key Laboratory of Polymeric Composite Materials, Qiqihar, China
| | - Tianyu Lan
- Heilongjiang Provincial Key Laboratory of Polymeric Composite Materials, Qiqihar, China
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10
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Arkenberg MR, Nguyen HD, Lin CC. Recent advances in bio-orthogonal and dynamic crosslinking of biomimetic hydrogels. J Mater Chem B 2020; 8:7835-7855. [PMID: 32692329 PMCID: PMC7574327 DOI: 10.1039/d0tb01429j] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
In recent years, dynamic, 'click' hydrogels have been applied in numerous biomedical applications. Owing to the mild, cytocompatible, and highly specific reaction kinetics, a multitude of orthogonal handles have been developed for fabricating dynamic hydrogels to facilitate '4D' cell culture. The high degree of tunability in crosslinking reactions of orthogonal 'click' chemistry has enabled a bottom-up approach to install specific biomimicry in an artificial extracellular matrix. In addition to click chemistry, highly specific enzymatic reactions are also increasingly used for network crosslinking and for spatiotemporal control of hydrogel properties. On the other hand, covalent adaptable chemistry has been used to recapitulate the viscoelastic component of biological tissues and for formulating self-healing and shear-thinning hydrogels. The common feature of these three classes of chemistry (i.e., orthogonal click chemistry, enzymatic reactions, and covalent adaptable chemistry) is that they can be carried out under ambient and aqueous conditions, a prerequisite for maintaining cell viability for in situ cell encapsulation and post-gelation modification of network properties. Due to their orthogonality, different chemistries can also be applied sequentially to provide additional biochemical and mechanical control to guide cell behavior. Herein, we review recent advances in the use of orthogonal click chemistry, enzymatic reactions, and covalent adaptable chemistry for the development of dynamically tunable and biomimetic hydrogels.
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Affiliation(s)
- Matthew R Arkenberg
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA.
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Nezhad-Mokhtari P, Ghorbani M, Roshangar L, Soleimani Rad J. Chemical gelling of hydrogels-based biological macromolecules for tissue engineering: Photo- and enzymatic-crosslinking methods. Int J Biol Macromol 2019; 139:760-772. [DOI: 10.1016/j.ijbiomac.2019.08.047] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2019] [Revised: 07/26/2019] [Accepted: 08/06/2019] [Indexed: 11/25/2022]
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12
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Hunckler MD, Medina JD, Coronel MM, Weaver JD, Stabler CL, García AJ. Linkage Groups within Thiol-Ene Photoclickable PEG Hydrogels Control In Vivo Stability. Adv Healthc Mater 2019; 8:e1900371. [PMID: 31111689 DOI: 10.1002/adhm.201900371] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 05/06/2019] [Indexed: 11/11/2022]
Abstract
Thiol-norbornene (thiol-ene) photoclickable poly(ethylene glycol) (PEG) hydrogels are a versatile biomaterial for cell encapsulation, drug delivery, and regenerative medicine. Numerous in vitro studies with these 4-arm ester-linked PEG-norbornene (PEG-4eNB) hydrogels demonstrate robust cytocompatibility and ability to retain long-term integrity with nondegradable crosslinkers. However, when transplanted in vivo into the subcutaneous or intraperitoneal space, these PEG-4eNB hydrogels with nondegradable crosslinkers rapidly degrade within 24 h. This characteristic limits the usefulness of PEG-4eNB hydrogels in biomedical applications. Replacing the ester linkage with an amide linkage (PEG-4aNB) mitigates this rapid in vivo degradation, and the PEG-4aNB hydrogels maintain long-term in vivo stability for months. Furthermore, when compared to PEG-4eNB, the PEG-4aNB hydrogels demonstrate equivalent mechanical properties, crosslinking kinetics, and high cytocompatibility with rat islets and human mesenchymal stem cells. Thus, the PEG-4aNB hydrogels may be a suitable replacement platform without necessitating critical design changes or sacrificing key properties relevant to the well-established PEG-4eNB hydrogels.
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Affiliation(s)
- Michael D. Hunckler
- Woodruff School of Mechanical Engineering and Petit Institute for Bioengineering and Bioscience Georgia Institute of Technology 315 Ferst Dr. NW Atlanta GA 30332 USA
| | - Juan D. Medina
- Coulter Department of Biomedical Engineering Georgia Institute of Technology 313 Ferst Dr. NW Atlanta GA 30332 USA
| | - Maria M. Coronel
- Woodruff School of Mechanical Engineering and Petit Institute for Bioengineering and Bioscience Georgia Institute of Technology 315 Ferst Dr. NW Atlanta GA 30332 USA
| | - Jessica D. Weaver
- Woodruff School of Mechanical Engineering and Petit Institute for Bioengineering and Bioscience Georgia Institute of Technology 315 Ferst Dr. NW Atlanta GA 30332 USA
| | - Cherie L. Stabler
- J. Crayton Pruitt Family Department of Biomedical Engineering University of Florida 1275 Center Dr. Gainesville FL 32611 USA
| | - Andrés J. García
- Woodruff School of Mechanical Engineering and Petit Institute for Bioengineering and Bioscience Georgia Institute of Technology 315 Ferst Dr. NW Atlanta GA 30332 USA
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Nguyen HD, Liu HY, Hudson BN, Lin CC. Enzymatic Cross-Linking of Dynamic Thiol-Norbornene Click Hydrogels. ACS Biomater Sci Eng 2019; 5:1247-1256. [PMID: 33304998 PMCID: PMC7725231 DOI: 10.1021/acsbiomaterials.8b01607] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Enzyme-mediated in situ forming hydrogels are attractive for many biomedical applications because gelation afforded by the enzymatic reactions can be readily controlled not only by tuning macromer compositions, but also by adjusting enzyme kinetics. For example, horseradish peroxidase (HRP) has been used extensively for in situ crosslinking of macromers containing hydroxyl-phenol groups. The use of HRP on initiating thiol-allylether polymerization has also been reported, yet no prior study has demonstrated enzymatic initiation of thiol-norbornene gelation. In this study, we discovered that HRP can generate thiyl radicals needed for initiating thiol-norbornene hydrogelation, which has only been demonstrated previously using photopolymerization. Enzymatic thiol-norbornene gelation not only overcomes light attenuation issue commonly observed in photopolymerized hydrogels, but also preserves modularity of the crosslinking. In particular, we prepared modular hydrogels from two sets of norbornene-modified macromers, 8-arm poly(ethylene glycol)-norbornene (PEG8NB) and gelatin-norbornene (GelNB). Bis-cysteine-containing peptides or PEG-tetra-thiol (PEG4SH) were used as crosslinkers for forming enzymatically and orthogonally polymerized hydrogels. For HRP-initiated PEG-peptide hydrogel crosslinking, gelation efficiency was significantly improved via adding tyrosine residues on the peptide crosslinkers. Interestingly, these additional tyrosine residues did not form permanent dityrosine crosslinks following HRP-induced gelation. As a result, they remained available for tyrosinase-mediated secondary crosslinking, which dynamically increases hydrogel stiffness. In addition to material characterizations, we also found that both PEG- and gelatin-based hydrogels provide excellent cytocompatibility for dynamic 3D cell culture. The enzymatic thiol-norbornene gelation scheme presented here offers a new crosslinking mechanism for preparing modularly and dynamically crosslinked hydrogels.
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Affiliation(s)
- Han D. Nguyen
- Department of Biomedical Engineering, Purdue School of Engineering & Technology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA
| | - Hung-Yi Liu
- Department of Biomedical Engineering, Purdue School of Engineering & Technology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA
| | - Britney N. Hudson
- Department of Biomedical Engineering, Purdue School of Engineering & Technology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA
| | - Chien-Chi Lin
- Department of Biomedical Engineering, Purdue School of Engineering & Technology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA
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Lin JT, Liu HW, Chen KT, Cheng DC. Modeling the Optimal Conditions for Improved Efficacy and Crosslink Depth of Photo-Initiated Polymerization. Polymers (Basel) 2019; 11:E217. [PMID: 30960200 PMCID: PMC6419268 DOI: 10.3390/polym11020217] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 01/21/2019] [Accepted: 01/22/2019] [Indexed: 12/18/2022] Open
Abstract
Optimal conditions for maximum efficacy of photoinitiated polymerization are theoretically presented. Analytic formulas are shown for the crosslink time, crosslink depth, and efficacy function. The roles of photoinitiator (PI) concentration, diffusion depth, and light intensity on the polymerization spatial and temporal profiles are presented for both uniform and non-uniform cases. For the type I mechanism, higher intensity may accelerate the polymer action process, but it suffers a lower steady-state efficacy. This may be overcome by a controlled re-supply of PI concentration during the light exposure. In challenging the conventional Beer⁻Lambert law (BLL), a generalized, time-dependent BLL (a Lin-law) is derived. This study, for the first time, presents analytic formulas for curing depth and crosslink time without the assumption of thin-film or spatial average. Various optimal conditions are developed for maximum efficacy based on a numerically-fit A-factor. Experimental data are analyzed for the role of PI concentration and light intensity on the gelation (crosslink) time and efficacy.
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Affiliation(s)
- Jui-Teng Lin
- New Vision Inc., 10F, No. 55, Sect.3, Xinbei Blvd, Xinzhuang, New Taipei City 242, Taiwan.
| | - Hsia-Wei Liu
- Department of Life Science, Fu Jen Catholic University, No. 510, Zhongzheng Rd., Xinzhuang, New Taipei City 242, Taiwan.
| | - Kuo-Ti Chen
- Graduate Institute of Applied Science and Engineering, Fu Jen Catholic University, Xinzhuang, New Taipei City 242, Taiwan.
| | - Da-Chuan Cheng
- Department of Biomedical Imaging and Radiological Science, China Medical University, Taichung 404, Taiwan.
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15
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Davis KA, Wu PJ, Cahall CF, Li C, Gottipati A, Berron BJ. Coatings on mammalian cells: interfacing cells with their environment. J Biol Eng 2019; 13:5. [PMID: 30675178 PMCID: PMC6337841 DOI: 10.1186/s13036-018-0131-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 12/09/2018] [Indexed: 12/18/2022] Open
Abstract
The research community is intent on harnessing increasingly complex biological building blocks. At present, cells represent a highly functional component for integration into higher order systems. In this review, we discuss the current application space for cellular coating technologies and emphasize the relationship between the target application and coating design. We also discuss how the cell and the coating interact in common analytical techniques, and where caution must be exercised in the interpretation of results. Finally, we look ahead at emerging application areas that are ideal for innovation in cellular coatings. In all, cellular coatings leverage the machinery unique to specific cell types, and the opportunities derived from these hybrid assemblies have yet to be fully realized.
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Affiliation(s)
- Kara A. Davis
- Chemical and Materials Engineering, University of Kentucky, 177 FPAT, Lexington, KY 40506-0046 USA
| | - Pei-Jung Wu
- Chemical and Materials Engineering, University of Kentucky, 177 FPAT, Lexington, KY 40506-0046 USA
| | - Calvin F. Cahall
- Chemical and Materials Engineering, University of Kentucky, 177 FPAT, Lexington, KY 40506-0046 USA
| | - Cong Li
- Chemical and Materials Engineering, University of Kentucky, 177 FPAT, Lexington, KY 40506-0046 USA
| | - Anuhya Gottipati
- Chemical and Materials Engineering, University of Kentucky, 177 FPAT, Lexington, KY 40506-0046 USA
| | - Brad J. Berron
- Chemical and Materials Engineering, University of Kentucky, 177 FPAT, Lexington, KY 40506-0046 USA
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16
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Salg GA, Giese NA, Schenk M, Hüttner FJ, Felix K, Probst P, Diener MK, Hackert T, Kenngott HG. The emerging field of pancreatic tissue engineering: A systematic review and evidence map of scaffold materials and scaffolding techniques for insulin-secreting cells. J Tissue Eng 2019; 10:2041731419884708. [PMID: 31700597 PMCID: PMC6823987 DOI: 10.1177/2041731419884708] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Accepted: 10/04/2019] [Indexed: 12/18/2022] Open
Abstract
A bioartificial endocrine pancreas is proposed as a future alternative to current treatment options. Patients with insulin-secretion deficiency might benefit. This is the first systematic review that provides an overview of scaffold materials and techniques for insulin-secreting cells or cells to be differentiated into insulin-secreting cells. An electronic literature survey was conducted in PubMed/MEDLINE and Web of Science, limited to the past 10 years. A total of 197 articles investigating 60 different materials met the inclusion criteria. The extracted data on materials, cell types, study design, and transplantation sites were plotted into two evidence gap maps. Integral parts of the tissue engineering network such as fabrication technique, extracellular matrix, vascularization, immunoprotection, suitable transplantation sites, and the use of stem cells are highlighted. This systematic review provides an evidence-based structure for future studies. Accumulating evidence shows that scaffold-based tissue engineering can enhance the viability and function or differentiation of insulin-secreting cells both in vitro and in vivo.
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Affiliation(s)
- Gabriel Alexander Salg
- Department of General, Abdominal and Transplantation Surgery, Heidelberg University Hospital, Heidelberg, Germany
| | - Nathalia A Giese
- Department of General, Abdominal and Transplantation Surgery, Heidelberg University Hospital, Heidelberg, Germany
| | - Miriam Schenk
- Department of General, Abdominal and Transplantation Surgery, Heidelberg University Hospital, Heidelberg, Germany
| | - Felix J Hüttner
- Department of General, Abdominal and Transplantation Surgery, Heidelberg University Hospital, Heidelberg, Germany
| | - Klaus Felix
- Department of General, Abdominal and Transplantation Surgery, Heidelberg University Hospital, Heidelberg, Germany
| | - Pascal Probst
- Department of General, Abdominal and Transplantation Surgery, Heidelberg University Hospital, Heidelberg, Germany
| | - Markus K Diener
- Department of General, Abdominal and Transplantation Surgery, Heidelberg University Hospital, Heidelberg, Germany
| | - Thilo Hackert
- Department of General, Abdominal and Transplantation Surgery, Heidelberg University Hospital, Heidelberg, Germany
| | - Hannes Götz Kenngott
- Department of General, Abdominal and Transplantation Surgery, Heidelberg University Hospital, Heidelberg, Germany
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17
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Shen D, Yuan L, Liang G, Gu A, Guan Q. Thermally resistant photocrosslinked damping poly(phenylene oxide)-fluorosilicone rubber films with broad and high effective damping temperatures. J Appl Polym Sci 2018. [DOI: 10.1002/app.47231] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Da Shen
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science; Soochow University; 199 Ren'Ai Road, Suzhou 215123 China
| | - Li Yuan
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science; Soochow University; 199 Ren'Ai Road, Suzhou 215123 China
| | - Guozheng Liang
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science; Soochow University; 199 Ren'Ai Road, Suzhou 215123 China
| | - Aijuan Gu
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science; Soochow University; 199 Ren'Ai Road, Suzhou 215123 China
| | - Qingbao Guan
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science; Soochow University; 199 Ren'Ai Road, Suzhou 215123 China
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18
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Jiang Z, Jiang K, McBride R, Oakey JS. Comparative cytocompatibility of multiple candidate cell types to photoencapsulation in PEGNB/PEGDA macroscale or microscale hydrogels. Biomed Mater 2018; 13:065012. [PMID: 30191888 PMCID: PMC6215765 DOI: 10.1088/1748-605x/aadf9a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The encapsulation of live cells into photopolymerized hydrogel scaffolds has the potential to augment or repair tissue defects, establish versatile regenerative medicine strategies, and be developed as well-defined, yet tunable microenvironments to study fundamental cellular behavior. However, hydrogel fabrication limitations constrain most studies to macroscale hydrogel scaffolds encapsulating millions of cells. These macroscale materials possess regions of heterogeneous photopolymerization conditions and are therefore poor platforms to identify the response of individual cells to encapsulation. Recently, microfluidic droplet-based hydrogel miniaturization and cell encapsulation offers high-throughput, reproducible, and continuous fabrication. Reports of post-encapsulation cell viability, however, vary widely among specific techniques. Furthermore, different cell types often exhibit different level of tolerance to photoencapsulation-induced toxicity. Accordingly, we evaluate the cellular tolerance of various encapsulation techniques and photopolymerization parameters for four mammalian cell types, with potential applications in tissue regeneration, using polyethylene glycol diacrylate or polyethylene glycol norbornene (PEGNB) hydrogels on micro- and macro-length scales. We found PEGNB provides excellent cellular tolerance and supports long-term cell survival by mitigating the deleterious effects of acrylate photopolymerization, which are exacerbated at diminishing volumes. PEGNB, therefore, is an excellent candidate for hydrogel miniaturization. PEGNB hydrogel properties, however, were found to have variable effects on encapsulating different cell candidates. This study could provide guidance for cell encapsulation practices in tissue engineering and regenerative medicine research.
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Affiliation(s)
- Zhongliang Jiang
- Department of Chemical Engineering, University of Wyoming, Laramie, United States of America
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19
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Ovadia EM, Colby DW, Kloxin AM. Designing well-defined photopolymerized synthetic matrices for three-dimensional culture and differentiation of induced pluripotent stem cells. Biomater Sci 2018; 6:1358-1370. [PMID: 29675520 PMCID: PMC6126667 DOI: 10.1039/c8bm00099a] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Induced pluripotent stem cells (iPSCs) are of interest for the study of disease, where these cells can be derived from patients and have the potential to be differentiated into any cell type; however, three-dimensional (3D) culture and differentiation of iPSCs within well-defined synthetic matrices for these applications remains limited. Here, we aimed to establish synthetic cell-degradable hydrogels that allow precise presentation of specific biochemical cues for 3D culture of iPSCs with relevance for hypothesis testing and lineage-specific differentiation. We synthesized poly(ethylene glycol)-(PEG)-peptide-based hydrogels by photoinitiated step growth polymerization and used them to test the hypothesis that the viability of iPSCs within these matrices could be rescued with appropriate biochemical cues inspired by proteins and integrins important for iPSC culture on Matrigel. Specifically, we selected a range of motifs inspired by iPSC binding to Matrigel, including laminin-derived IKVAV and YIGSR, α5β1-binding PHSRNG10RGDS, αvβ5-binding KKQRFRHRNRKG, and RGDS that is known to bind a variety of integrins for generally promoting cell adhesion. YIGSR and PHSRNG10RGDS resulted in the highest iPSC viability, where binding of β1 integrin was key, and these permissive compositions also allowed iPSC differentiation into neural progenitor cells (NPCs) (decreased oct4 expression and increased pax6 expression) in response to soluble factors. The resulting NPCs formed clusters of different sizes in response to each peptide, suggesting that matrix biochemical cues affect iPSC proliferation and clustering in 3D culture. In summary, we have established photopolymerizable synthetic matrices for the encapsulation, culture, and differentiation of iPSCs for studies of cell-matrix interactions and deployment in disease models.
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Affiliation(s)
- Elisa M Ovadia
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, DE 19716, USA.
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20
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Colak B, Di Cio S, Gautrot JE. Biofunctionalized Patterned Polymer Brushes via Thiol–Ene Coupling for the Control of Cell Adhesion and the Formation of Cell Arrays. Biomacromolecules 2018; 19:1445-1455. [DOI: 10.1021/acs.biomac.7b01436] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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21
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Holmes R, Yang XB, Dunne A, Florea L, Wood D, Tronci G. Thiol-Ene Photo-Click Collagen-PEG Hydrogels: Impact of Water-Soluble Photoinitiators on Cell Viability, Gelation Kinetics and Rheological Properties. Polymers (Basel) 2017; 9:E226. [PMID: 30970903 PMCID: PMC6431953 DOI: 10.3390/polym9060226] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 06/06/2017] [Accepted: 06/09/2017] [Indexed: 12/23/2022] Open
Abstract
Thiol-ene photo-click hydrogels were prepared via step-growth polymerisation using thiol-functionalised type-I collagen and 8-arm poly(ethylene glycol) norbornene-terminated (PEG-NB), as a potential injectable regenerative device. Type-I collagen was thiol-functionalised by a ring opening reaction with 2-iminothiolane (2IT), whereby up to 80 Abs.% functionalisation and 90 RPN% triple helical preservation were recorded via 2,4,6-Trinitrobenzenesulfonic acid (TNBS) colorimetric assay and circular dichroism (CD). Type, i.e., either 2-Hydroxy-1-[4-(2-hydroxyethoxy) phenyl]-2-methyl-1-propanone (I2959) or lithium phenyl-2,4,6-trimethylbenzoylphosphinate (LAP), and concentration of photoinitiator were varied to ensure minimal photoinitiator-induced cytotoxicity and to enable thiol-ene network formation of collagen-PEG mixtures. The viability of G292 cells following 24 h culture in photoinitiator-supplemented media was largely affected by the photoinitiator concentration, with I2959-supplemented media observed to induce higher toxic response (0.1 → 0.5% (w/v) I2959, cell survival: 62 → 2 Abs.%) compared to LAP-supplemented media (cell survival: 86 → 8 Abs.%). In line with the in vitro study, selected photoinitiator concentrations were used to prepare thiol-ene photo-click hydrogels. Gelation kinetics proved to be largely affected by the specific photoinitiator, with LAP-containing thiol-ene mixtures leading to significantly reduced complete gelation time (τ: 187 s) with respect to I2959-containing mixtures (τ: 1683 s). Other than the specific photoinitiator, the photoinitiator concentration was key to adjusting the hydrogel storage modulus (G'), whereby 15-fold G' increase (232 → 3360 Pa) was observed in samples prepared with 0.5% (w/v) compared to 0.1% (w/v) LAP. Further thiol-ene formulations with 0.5% (w/v) LAP and varied content of PEG-NB were tested to prepare photo-click hydrogels with porous architecture, as well as tunable storage modulus (G': 540⁻4810 Pa), gelation time (τ: 73⁻300 s) and swelling ratio (SR: 1530⁻2840 wt %). The photoinitiator-gelation-cytotoxicity relationships established in this study will be instrumental to the design of orthogonal collagen-based niches for regenerative medicine.
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Affiliation(s)
- Róisín Holmes
- Biomaterials and Tissue Engineering Research Group, School of Dentistry, University of Leeds, Wellcome Trust Brenner Building, St James' University Hospital, Leeds LS9 7TF, UK.
| | - Xue-Bin Yang
- Biomaterials and Tissue Engineering Research Group, School of Dentistry, University of Leeds, Wellcome Trust Brenner Building, St James' University Hospital, Leeds LS9 7TF, UK.
| | - Aishling Dunne
- Insight Centre for Data Analytics, National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, Dublin 9, Glasnevin, Ireland.
| | - Larisa Florea
- Insight Centre for Data Analytics, National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, Dublin 9, Glasnevin, Ireland.
| | - David Wood
- Biomaterials and Tissue Engineering Research Group, School of Dentistry, University of Leeds, Wellcome Trust Brenner Building, St James' University Hospital, Leeds LS9 7TF, UK.
| | - Giuseppe Tronci
- Biomaterials and Tissue Engineering Research Group, School of Dentistry, University of Leeds, Wellcome Trust Brenner Building, St James' University Hospital, Leeds LS9 7TF, UK.
- Textile Technology Research Group, School of Design, University of Leeds, Leeds LS2 9JT, UK.
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