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Dollinger BR, Gupta MK, Martin JR, Duvall CL. Reactive Oxygen Species Shielding Hydrogel for the Delivery of Adherent and Nonadherent Therapeutic Cell Types<sup/>. Tissue Eng Part A 2017; 23:1120-1131. [PMID: 28394196 DOI: 10.1089/ten.tea.2016.0495] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Cell therapies suffer from poor survival post-transplant due to placement into hostile implant sites characterized by host immune response and innate production of high levels of reactive oxygen species (ROS). We hypothesized that cellular encapsulation within an injectable, antioxidant hydrogel would improve viability of cells exposed to high oxidative stress. To test this hypothesis, we applied a dual thermo- and ROS-responsive hydrogel comprising the ABC triblock polymer poly[(propylene sulfide)-block-(N,N-dimethyl acrylamide)-block-(N-isopropylacrylamide)] (PPS135-b-PDMA152-b-PNIPAAM225, PDN). The PPS chemistry reacts irreversibly with ROS such as hydrogen peroxide (H2O2), imparting inherent antioxidant properties to the system. Here, PDN hydrogels were successfully integrated with type 1 collagen to form ROS-protective, composite hydrogels amenable to spreading and growth of adherent cell types such as mesenchymal stem cells (MSCs). It was also shown that, using a control hydrogel substituting nonreactive polycaprolactone in place of PPS, the ROS-reactive PPS chemistry is directly responsible for PDN hydrogel cytoprotection of both MSCs and insulin-producing β-cell pseudo-islets against H2O2 toxicity. In sum, these results establish the potential of cytoprotective, thermogelling PDN biomaterials for injectable delivery of cell therapies.
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Affiliation(s)
- Bryan R Dollinger
- Department of Biomedical Engineering, Vanderbilt University , Nashville, Tennessee
| | - Mukesh K Gupta
- Department of Biomedical Engineering, Vanderbilt University , Nashville, Tennessee
| | - John R Martin
- Department of Biomedical Engineering, Vanderbilt University , Nashville, Tennessee
| | - Craig L Duvall
- Department of Biomedical Engineering, Vanderbilt University , Nashville, Tennessee
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Mckenzie A, Hoskins R, Swift T, Grant C, Rimmer S. Core (Polystyrene)-Shell [Poly(glycerol monomethacrylate)] Particles. ACS APPLIED MATERIALS & INTERFACES 2017; 9:7577-7590. [PMID: 28192649 DOI: 10.1021/acsami.6b15004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A set of water-swollen core-shell particles was synthesized by emulsion polymerization of a 1,3-dioxolane functional monomer in water. After removal of the 1,3-dioxolane group, the particles' shells were shown to swell in aqueous media. Upon hydrolysis, the particles increased in size from around 70 to 100-130 nm. A bicinchoninic acid assay and ζ-potential measurements were used to investigate the adsorption of lysozyme, albumin, or fibrinogen. Each of the core-shell particles adsorbed significantly less protein than the noncoated core (polystyrene) particles. Differences were observed as both the amount of difunctional, cross-linking monomer and the amount of shell monomer in the feed were changed. The core-shell particles were shown to be resistant to protein adsorption, and the degree to which the three proteins adsorbed was dependent on the formulation of the shell.
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Affiliation(s)
- Andrew Mckenzie
- Department of Chemistry, University of Sheffield , Sheffield, South Yorkshire S3 7HF, U.K
| | - Richard Hoskins
- School of Chemistry and Biosciences, University of Bradford , Bradford, West Yorkshire BD7 1DP, U.K
| | - Thomas Swift
- School of Chemistry and Biosciences, University of Bradford , Bradford, West Yorkshire BD7 1DP, U.K
| | - Colin Grant
- Department of Engineering, University of Bradford , Bradford, West Yorkshire BD7 1DP, U.K
| | - Stephen Rimmer
- School of Chemistry and Biosciences, University of Bradford , Bradford, West Yorkshire BD7 1DP, U.K
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Barnes AL, Genever PG, Rimmer S, Coles MC. Collagen-Poly(N-isopropylacrylamide) Hydrogels with Tunable Properties. Biomacromolecules 2016; 17:723-34. [PMID: 26686360 DOI: 10.1021/acs.biomac.5b01251] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
There is a lack of hydrogel materials whose properties can be tuned at the point of use. Biological hydrogels, such as collagen, gelate at physiological temperatures; however, they are not always ideal as scaffolds because of their low mechanical strength. Their mechanics can be improved through cross-linking and chemical modification, but these methods still require further synthesis. We have demonstrated that by combining collagen with a thermoresponsive polymer, poly(N-isopropylacrylamide) (PNIPAM), the mechanical properties can be improved while maintaining cytocompatibility. Furthermore, different concentrations of this polymer led to a range of hydrogels with shear moduli ranging from 10(5) Pa down to less than 10(2) Pa, similar to the soft tissues in the body. In addition to variable mechanical properties, the hydrogel blends have a range of micron-scale structures and porosities, which caused adipose-derived stromal cells (ADSCs) to adopt different morphologies when encapsulated within and may therefore be able to direct cell fate.
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Affiliation(s)
- Amanda L Barnes
- Department of Biology, University of York , York, YO10 5DD, United Kingdom.,Centre for Immunology and Infection, Department of Biology, University of York , York, YO10 5DD, United Kingdom
| | - Paul G Genever
- Department of Biology, University of York , York, YO10 5DD, United Kingdom
| | - Stephen Rimmer
- School of Chemistry and Forensic Science, University of Bradford , Bradford, West Yorkshire, BD7 1DP, United Kingdom
| | - Mark C Coles
- Centre for Immunology and Infection, Department of Biology, University of York , York, YO10 5DD, United Kingdom
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Tronci G, Grant CA, Thomson NH, Russell SJ, Wood DJ. Multi-scale mechanical characterization of highly swollen photo-activated collagen hydrogels. J R Soc Interface 2015; 12:20141079. [PMID: 25411409 PMCID: PMC4277102 DOI: 10.1098/rsif.2014.1079] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Biological hydrogels have been increasingly sought after as wound dressings or scaffolds for regenerative medicine, owing to their inherent biofunctionality in biological environments. Especially in moist wound healing, the ideal material should absorb large amounts of wound exudate while remaining mechanically competent in situ. Despite their large hydration, however, current biological hydrogels still leave much to be desired in terms of mechanical properties in physiological conditions. To address this challenge, a multi-scale approach is presented for the synthetic design of cyto-compatible collagen hydrogels with tunable mechanical properties (from the nano- up to the macro-scale), uniquely high swelling ratios and retained (more than 70%) triple helical features. Type I collagen was covalently functionalized with three different monomers, i.e. 4-vinylbenzyl chloride, glycidyl methacrylate and methacrylic anhydride, respectively. Backbone rigidity, hydrogen-bonding capability and degree of functionalization (F: 16 ± 12–91 ± 7 mol%) of introduced moieties governed the structure–property relationships in resulting collagen networks, so that the swelling ratio (SR: 707 ± 51–1996 ± 182 wt%), bulk compressive modulus (Ec: 30 ± 7–168 ± 40 kPa) and atomic force microscopy elastic modulus (EAFM: 16 ± 2–387 ± 66 kPa) were readily adjusted. Because of their remarkably high swelling and mechanical properties, these tunable collagen hydrogels may be further exploited for the design of advanced dressings for chronic wound care.
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Affiliation(s)
- Giuseppe Tronci
- Nonwovens Research Group, School of Design, University of Leeds, Leeds LS2 9JT, UK Biomaterials and Tissue Engineering Research Group, School of Dentistry, University of Leeds, Leeds LS2 9LU, UK
| | - Colin A Grant
- Advanced Materials Engineering RKT Centre, School of Engineering, University of Bradford, Bradford BD7 1DP, UK
| | - Neil H Thomson
- Molecular and Nanoscale Physics, School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK Biomineralisation Research Group, School of Dentistry, University of Leeds, Leeds LS2 9LU, UK
| | - Stephen J Russell
- Nonwovens Research Group, School of Design, University of Leeds, Leeds LS2 9JT, UK
| | - David J Wood
- Biomaterials and Tissue Engineering Research Group, School of Dentistry, University of Leeds, Leeds LS2 9LU, UK
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Yang Q, Wang K, Nie J, Du B, Tang G. Poly(N-vinylpyrrolidinone) Microgels: Preparation, Biocompatibility, and Potential Application as Drug Carriers. Biomacromolecules 2014; 15:2285-93. [DOI: 10.1021/bm5004493] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Qing Yang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China
| | - Kai Wang
- Department
of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Jingjing Nie
- Department
of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Binyang Du
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China
| | - Guping Tang
- Department
of Chemistry, Zhejiang University, Hangzhou 310027, China
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Tronci G, Russell SJ, Wood DJ. Photo-active collagen systems with controlled triple helix architecture. J Mater Chem B 2013; 1:3705-3715. [PMID: 27398214 PMCID: PMC4934656 DOI: 10.1039/c3tb20720j] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The design of photo-active collagen systems is presented as a basis for establishing biomimetic materials with varied network architecture and programmable macroscopic properties. Following in-house isolation of type I collagen, reaction with vinyl-bearing compounds of varied backbone rigidity, i.e. 4-vinylbenzyl chloride (4VBC) and glycidyl methacrylate (GMA), was carried out. TNBS colorimetric assay, 1H-NMR and ATR-FTIR confirmed covalent and tunable functionalization of collagen lysines. Depending on the type and extent of functionalization, controlled stability and thermal denaturation of triple helices were observed via circular dichroism (CD), whereby the hydrogen-bonding capability of introduced moieties was shown to play a major role. Full gel formation was observed following photo-activation of functionalized collagen solutions. The presence of a covalent network only slightly affected collagen triple helix conformation (as observed by WAXS and ATR-FTIR), confirming the structural organization of functionalized collagen precursors. Photo-activated hydrogels demonstrated an increased denaturation temperature (DSC) with respect to native collagen, suggesting that the formation of the covalent network successfully stabilized collagen triple helices. Moreover, biocompatibility and mechanical competence of obtained hydrogels were successfully demonstrated under physiologically-relevant conditions. These results demonstrate that this novel synthetic approach enabled the formation of biocompatible collagen systems with defined network architecture and programmable macroscopic properties, which can only partially be obtained with current synthetic methods.
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Affiliation(s)
- Giuseppe Tronci
- Biomaterials and Tissue Engineering Research Group, Leeds Dental Institute, University of Leeds, UK
- Nonwovens Research Group, Centre for Technical Textiles, University of Leeds, UK
| | - Stephen J. Russell
- Nonwovens Research Group, Centre for Technical Textiles, University of Leeds, UK
| | - David J. Wood
- Biomaterials and Tissue Engineering Research Group, Leeds Dental Institute, University of Leeds, UK
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Lee K, Jin G, Jang CH, Jung WK, Kim G. Preparation and characterization of multi-layered poly(ε-caprolactone)/chitosan scaffolds fabricated with a combination of melt-plotting/in situ plasma treatment and a coating method for hard tissue regeneration. J Mater Chem B 2013; 1:5831-5841. [DOI: 10.1039/c3tb21123a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Elowsson L, Kirsebom H, Carmignac V, Mattiasson B, Durbeej M. Evaluation of macroporous blood and plasma scaffolds for skeletal muscle tissue engineering. Biomater Sci 2013; 1:402-410. [DOI: 10.1039/c2bm00054g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Lapworth JW, Hatton PV, Rimmer S. Thermally responsive gels formed from highly branched poly(N-isopropyl acrylamide)s with either carboxylic acid or trihistidine end groups. RSC Adv 2013. [DOI: 10.1039/c3ra43233e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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