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Phogat S, Thiam F, Al Yazeedi S, Abokor FA, Osei ET. 3D in vitro hydrogel models to study the human lung extracellular matrix and fibroblast function. Respir Res 2023; 24:242. [PMID: 37798767 PMCID: PMC10552248 DOI: 10.1186/s12931-023-02548-6] [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: 06/26/2023] [Accepted: 09/25/2023] [Indexed: 10/07/2023] Open
Abstract
The pulmonary extracellular matrix (ECM) is a macromolecular structure that provides mechanical support, stability and elastic recoil for different pulmonary cells including the lung fibroblasts. The ECM plays an important role in lung development, remodeling, repair, and the maintenance of tissue homeostasis. Biomechanical and biochemical signals produced by the ECM regulate the phenotype and function of various cells including fibroblasts in the lungs. Fibroblasts are important lung structural cells responsible for the production and repair of different ECM proteins (e.g., collagen and fibronectin). During lung injury and in chronic lung diseases such as asthma, idiopathic pulmonary fibrosis (IPF) and chronic obstructive pulmonary disease (COPD), an abnormal feedback between fibroblasts and the altered ECM disrupts tissue homeostasis and leads to a vicious cycle of fibrotic changes resulting in tissue remodeling. In line with this, using 3D hydrogel culture models with embedded lung fibroblasts have enabled the assessment of the various mechanisms involved in driving defective (fibrotic) fibroblast function in the lung's 3D ECM environment. In this review, we provide a summary of various studies that used these 3D hydrogel models to assess the regulation of the ECM on lung fibroblast phenotype and function in altered lung ECM homeostasis in health and in chronic respiratory disease.
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Affiliation(s)
- Sakshi Phogat
- Department of Biology, Okanagan Campus, University of British Columbia, 3187 University Way, ASC366, Kelowna, BC, V1V1V7, Canada
| | - Fama Thiam
- Department of Biology, Okanagan Campus, University of British Columbia, 3187 University Way, ASC366, Kelowna, BC, V1V1V7, Canada
| | - Safiya Al Yazeedi
- Department of Biology, Okanagan Campus, University of British Columbia, 3187 University Way, ASC366, Kelowna, BC, V1V1V7, Canada
| | - Filsan Ahmed Abokor
- Department of Biology, Okanagan Campus, University of British Columbia, 3187 University Way, ASC366, Kelowna, BC, V1V1V7, Canada
| | - Emmanuel Twumasi Osei
- Department of Biology, Okanagan Campus, University of British Columbia, 3187 University Way, ASC366, Kelowna, BC, V1V1V7, Canada.
- Centre for Heart Lung Innovation, St. Paul's Hospital, Vancouver, BC, V6Z 1Y6, Canada.
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2
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An Z, Wu J, Li SH, Chen S, Lu FL, Xu ZY, Sung HW, Li RK. Injectable conductive hydrogel can reduce pacing threshold and enhance efficacy of cardiac pacemaker. Am J Cancer Res 2021; 11:3948-3960. [PMID: 33664872 PMCID: PMC7914366 DOI: 10.7150/thno.54959] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2020] [Accepted: 01/13/2021] [Indexed: 11/26/2022] Open
Abstract
Background: Pacemaker implantation is currently used in patients with symptomatic bradycardia. Since a pacemaker is a lifetime therapeutic device, its energy consumption contributes to battery exhaustion, along with its voltage stimulation resulting in local fibrosis and greater resistance, which are all detrimental to patients. The possible resolution for those clinical issues is an injection of a conductive hydrogel, poly-3-amino-4-methoxybenzoic acid-gelatin (PAMB-G), to reduce the myocardial threshold voltage for pacemaker stimulation. Methods: PAMB-G is synthesized by covalently linking PAMB to gelatin, and its conductivity is measured using two-point resistivity. Rat hearts are injected with gelatin or PAMB-G, and pacing threshold is evaluated using electrocardiogram and cardiac optical mapping. Results: PAMB-G conductivity is 13 times greater than in gelatin. The ex vivo model shows that PAMB-G significantly enhances cardiac tissue stimulation. Injection of PAMB-G into the stimulating electrode location at the myocardium has a 4 times greater reduction of pacing threshold voltage, compared with electrode-only or gelatin-injected tissues. Multi-electrode array mapping reveals that the cardiac conduction velocity of PAMB-G group is significantly faster than the non- or gelatin-injection groups. PAMB-G also reduces pacing threshold voltage in an adenosine-induced atrial-ventricular block rat model. Conclusion: PAMB-G hydrogel reduces cardiac pacing threshold voltage, which is able to enhance pacemaker efficacy.
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3
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Mechanomicrobiology: how bacteria sense and respond to forces. Nat Rev Microbiol 2020; 18:227-240. [DOI: 10.1038/s41579-019-0314-2] [Citation(s) in RCA: 99] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/06/2019] [Indexed: 12/26/2022]
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4
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Liu HY, Lin CC. A Diffusion-Reaction Model for Predicting Enzyme-Mediated Dynamic Hydrogel Stiffening. Gels 2019; 5:gels5010017. [PMID: 30871250 PMCID: PMC6473751 DOI: 10.3390/gels5010017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 03/01/2019] [Accepted: 03/06/2019] [Indexed: 02/04/2023] Open
Abstract
Hydrogels with spatiotemporally tunable mechanical properties have been increasingly employed for studying the impact of tissue mechanics on cell fate processes. These dynamic hydrogels are particularly suitable for recapitulating the temporal stiffening of a tumor microenvironment. To this end, we have reported an enzyme-mediated stiffening hydrogel system where tyrosinase (Tyrase) was used to stiffen orthogonally crosslinked cell-laden hydrogels. Herein, a mathematical model was proposed to describe enzyme diffusion and reaction within a highly swollen gel network, and to elucidate the critical factors affecting the degree of gel stiffening. Briefly, Fick’s second law of diffusion was used to predict enzyme diffusion in a swollen poly(ethylene glycol) (PEG)-peptide hydrogel, whereas the Michaelis–Menten model was employed for estimating the extent of enzyme-mediated secondary crosslinking. To experimentally validate model predictions, we designed a hydrogel system composed of 8-arm PEG-norbornene (PEG8NB) and bis-cysteine containing peptide crosslinker. Hydrogel was crosslinked in a channel slide that permitted one-dimensional diffusion of Tyrase. Model predictions and experimental results suggested that an increasing network crosslinking during stiffening process did not significantly affect enzyme diffusion. Rather, diffusion path length and the time of enzyme incubation were more critical in determining the distribution of Tyrase and the formation of additional crosslinks in the hydrogel network. Finally, we demonstrated that the enzyme-stiffened hydrogels exhibited elastic properties similar to other chemically crosslinked hydrogels. This study provides a better mechanistic understanding regarding the process of enzyme-mediated dynamic stiffening of hydrogels.
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Affiliation(s)
- Hung-Yi Liu
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA.
| | - Chien-Chi Lin
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA.
- Department of Biomedical Engineering, Purdue School of Engineering & Technology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA.
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5
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Francone A, Kehoe T, Obieta I, Saez-Martinez V, Bilbao L, Khokhar AZ, Gadegaard N, Simao CD, Kehagias N, Sotomayor Torres CM. Integrated 3D Hydrogel Waveguide Out-Coupler by Step-and-Repeat Thermal Nanoimprint Lithography: A Promising Sensor Device for Water and pH. SENSORS (BASEL, SWITZERLAND) 2018; 18:E3240. [PMID: 30261650 PMCID: PMC6210174 DOI: 10.3390/s18103240] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Revised: 09/14/2018] [Accepted: 09/20/2018] [Indexed: 11/16/2022]
Abstract
Hydrogel materials offer many advantages for chemical and biological sensoring due to their response to a small change in their environment with a related change in volume. Several designs have been outlined in the literature in the specific field of hydrogel-based optical sensors, reporting a large number of steps for their fabrication. In this work we present a three-dimensional, hydrogel-based sensor the structure of which is fabricated in a single step using thermal nanoimprint lithography. The sensor is based on a waveguide with a grating readout section. A specific hydrogel formulation, based on a combination of PEGDMA (Poly(Ethylene Glycol DiMethAcrylate)), NIPAAm (N-IsoPropylAcrylAmide), and AA (Acrylic Acid), was developed. This stimulus-responsive hydrogel is sensitive to pH and to water. Moreover, the hydrogel has been modified to be suitable for fabrication by thermal nanoimprint lithography. Once stimulated, the hydrogel-based sensor changes its topography, which is characterised physically by AFM and SEM, and optically using a specific optical set-up.
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Affiliation(s)
- Achille Francone
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Spain.
| | - Timothy Kehoe
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Spain.
| | - Isabel Obieta
- Tecnalia Research & Innovation, Mikeletegi 2, E-20009 San Sebastián, Spain.
| | | | - Leire Bilbao
- Tecnalia Research & Innovation, Mikeletegi 2, E-20009 San Sebastián, Spain.
| | - Ali Z Khokhar
- Division of Biomedical Engineering, University Glasgow, Rankine Building, Glasgow G12 8LT, UK.
| | - Nikolaj Gadegaard
- Division of Biomedical Engineering, University Glasgow, Rankine Building, Glasgow G12 8LT, UK.
| | - Claudia Delgado Simao
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Spain.
| | - Nikolaos Kehagias
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Spain.
| | - Clivia M Sotomayor Torres
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Spain.
- Institucio Catalana de Recerca i Estudis Avançats (ICREA), 08010 Barcelona, Spain.
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Sawyer SW, Shridhar SV, Zhang K, Albrecht LD, Filip AB, Horton JA, Soman P. Perfusion directed 3D mineral formation within cell-laden hydrogels. Biofabrication 2018; 10:035013. [PMID: 29882516 DOI: 10.1088/1758-5090/aacb42] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Despite the promise of stem cell engineering and the new advances in bioprinting technologies, one of the major challenges in the manufacturing of large scale bone tissue scaffolds is the inability to perfuse nutrients throughout thick constructs. Here, we report a scalable method to create thick, perfusable bone constructs using a combination of cell-laden hydrogels and a 3D printed sacrificial polymer. Osteoblast-like Saos-2 cells were encapsulated within a gelatin methacrylate (GelMA) hydrogel and 3D printed polyvinyl alcohol pipes were used to create perfusable channels. A custom-built bioreactor was used to perfuse osteogenic media directly through the channels in order to induce mineral deposition which was subsequently quantified via micro-CT. Histological staining was used to verify mineral deposition around the perfused channels, while COMSOL modeling was used to simulate oxygen diffusion between adjacent channels. This information was used to design a scaled-up construct containing a 3D array of perfusable channels within cell-laden GelMA. Progressive matrix mineralization was observed by cells surrounding perfused channels as opposed to random mineral deposition in static constructs. Micro-CT confirmed that there was a direct relationship between channel mineralization within perfused constructs and time within the bioreactor. Furthermore, the scalable method presented in this work serves as a model on how large-scale bone tissue replacement constructs could be made using commonly available 3D printers, sacrificial materials, and hydrogels.
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Affiliation(s)
- Stephen W Sawyer
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, NY, United States of America
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7
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Prévôt ME, Andro H, Alexander SLM, Ustunel S, Zhu C, Nikolov Z, Rafferty ST, Brannum MT, Kinsel B, Korley LTJ, Freeman EJ, McDonough JA, Clements RJ, Hegmann E. Liquid crystal elastomer foams with elastic properties specifically engineered as biodegradable brain tissue scaffolds. SOFT MATTER 2018; 14:354-360. [PMID: 29236117 DOI: 10.1039/c7sm01949a] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Tissue regeneration requires 3-dimensional (3D) smart materials as scaffolds to promote transport of nutrients. To mimic mechanical properties of extracellular matrices, biocompatible polymers have been widely studied and a diverse range of 3D scaffolds have been produced. We propose the use of responsive polymeric materials to create dynamic substrates for cell culture, which goes beyond designing only a physical static 3D scaffold. Here, we demonstrated that lactone- and lactide-based star block-copolymers (SBCs), where a liquid crystal (LC) moiety has been attached as a side-group, can be crosslinked to obtain Liquid Crystal Elastomers (LCEs) with a porous architecture using a salt-leaching method to promote cell infiltration. The obtained SmA LCE-based fully interconnected-porous foams exhibit a Young modulus of 0.23 ± 0.07 MPa and a biodegradability rate of around 20% after 15 weeks both of which are optimized to mimic native environments. We present cell culture results showing growth and proliferation of neurons on the scaffold after four weeks. This research provides a new platform to analyse LCE scaffold-cell interactions where the presence of liquid crystal moieties promotes cell alignment paving the way for a stimulated brain-like tissue.
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Affiliation(s)
- M E Prévôt
- Liquid Crystal Institute, Kent State University, 1425 Lester Lefton Esplanade, Kent, OH 44242, USA and Department of Biological Sciences, Kent State University, 850 Lester Lefton Esplanade, Kent, OH 44242, USA.
| | - H Andro
- Liquid Crystal Institute, Kent State University, 1425 Lester Lefton Esplanade, Kent, OH 44242, USA
| | - S L M Alexander
- Macromolecular Sciences and Engineering Department, Case Western Reserve University, 2100 Adelbert Road, Cleveland, OH 44106, USA
| | - S Ustunel
- Liquid Crystal Institute, Kent State University, 1425 Lester Lefton Esplanade, Kent, OH 44242, USA and Department of Biological Sciences, Kent State University, 850 Lester Lefton Esplanade, Kent, OH 44242, USA. and Chemical Physics Interdisciplinary Program, Kent State University, 1425 Lester Lefton Esplanade, Kent, OH 44242, USA
| | - C Zhu
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
| | - Z Nikolov
- National Polymer Innovation Center, College of Polymer Science and Polymer Engineering, The University of Akron, 240 S Forge Street, Akron, OH 44325, USA
| | - S T Rafferty
- Liquid Crystal Institute, Kent State University, 1425 Lester Lefton Esplanade, Kent, OH 44242, USA
| | - M T Brannum
- Macromolecular Sciences and Engineering Department, Case Western Reserve University, 2100 Adelbert Road, Cleveland, OH 44106, USA
| | - B Kinsel
- Liquid Crystal Institute, Kent State University, 1425 Lester Lefton Esplanade, Kent, OH 44242, USA
| | - L T J Korley
- Macromolecular Sciences and Engineering Department, Case Western Reserve University, 2100 Adelbert Road, Cleveland, OH 44106, USA
| | - E J Freeman
- Department of Biological Sciences, Kent State University, 850 Lester Lefton Esplanade, Kent, OH 44242, USA.
| | - J A McDonough
- Department of Biological Sciences, Kent State University, 850 Lester Lefton Esplanade, Kent, OH 44242, USA.
| | - R J Clements
- Department of Biological Sciences, Kent State University, 850 Lester Lefton Esplanade, Kent, OH 44242, USA.
| | - E Hegmann
- Liquid Crystal Institute, Kent State University, 1425 Lester Lefton Esplanade, Kent, OH 44242, USA and Department of Biological Sciences, Kent State University, 850 Lester Lefton Esplanade, Kent, OH 44242, USA. and Chemical Physics Interdisciplinary Program, Kent State University, 1425 Lester Lefton Esplanade, Kent, OH 44242, USA
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8
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Sawyer SW, Dong P, Venn S, Ramos A, Quinn D, Horton JA, Soman P. Conductive gelatin methacrylate-poly(aniline) hydrogel for cell encapsulation. Biomed Phys Eng Express 2017. [DOI: 10.1088/2057-1976/aa91f9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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9
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Epithelial-mesenchymal crosstalk influences cellular behavior in a 3D alveolus-fibroblast model system. Biomaterials 2017; 155:124-134. [PMID: 29175081 DOI: 10.1016/j.biomaterials.2017.11.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Accepted: 11/12/2017] [Indexed: 01/22/2023]
Abstract
Interactions between lung epithelium and interstitial fibroblasts are increasingly recognized as playing a major role in the progression of several lung pathologies, including cancer. Three-dimensional in vitro co-culture systems offer tissue-relevant platforms to study the signaling interplay between diseased and healthy cell types. Such systems provide a controlled environment in which to probe the mechanisms involved in epithelial-mesenchymal crosstalk. To recapitulate the native alveolar tissue architecture, we employed a cyst templating technique to culture alveolar epithelial cells on photodegradable microspheres and subsequently encapsulated the cell-laden spheres within poly (ethylene glycol) (PEG) hydrogels containing dispersed pulmonary fibroblasts. A fibroblast cell line (CCL-210) was co-cultured with either healthy mouse alveolar epithelial primary cells or a cancerous alveolar epithelial cell line (A549) to probe the influence of tumor-stromal interactions on proliferation, migration, and matrix remodeling. In 3D co-culture, cancerous epithelial cells and fibroblasts had higher proliferation rates. When examining fibroblast motility, the fibroblasts migrated faster when co-cultured with cancerous A549 cells. Finally, a fluorescent peptide reporter for matrix metalloproteinase (MMP) activity revealed increased MMP activity when A549s and fibroblasts were co-cultured. When MMP activity was inhibited or when cells were cultured in gels with a non-degradable crosslinker, fibroblast migration was dramatically suppressed, and the increase in cancer cell proliferation in co-culture was abrogated. Together, this evidence supports the idea that there is an exchange between the alveolar epithelium and surrounding fibroblasts during cancer progression that depends on MMP activity and points to potential signaling routes that merit further investigation to determine targets for cancer treatment.
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10
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Tian Y, Zonca MR, Imbrogno J, Unser AM, Sfakis L, Temple S, Belfort G, Xie Y. Polarized, Cobblestone, Human Retinal Pigment Epithelial Cell Maturation on a Synthetic PEG Matrix. ACS Biomater Sci Eng 2017; 3:890-902. [PMID: 33429561 DOI: 10.1021/acsbiomaterials.6b00757] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Cell attachment is essential for the growth and polarization of retinal pigment epithelial (RPE) cells. Currently, surface coatings derived from biological proteins are used as the gold standard for cell culture. However, downstream processing and purification of these biological products can be cumbersome and expensive. In this study, we constructed a library of chemically modified nanofibers to mimic the Bruch's membrane of the retinal pigment epithelium. Using atmospheric-pressure plasma-induced graft polymerization with a high-throughput screening platform to modify the nanofibers, we identified three polyethylene glycol (PEG)-grafted nanofiber surfaces (PEG methyl ether methacrylate, n = 4, 8, and 45) from a library of 62 different surfaces as favorable for RPE cell attachment, proliferation, and maturation in vitro with cobblestone morphology. Compared with the biologically derived culture matrices such as vitronectin-based peptide Synthemax, our newly discovered synthetic PEG surfaces exhibit similar growth and polarization of retinal pigment epithelial (RPE) cells. However, they are chemically defined, are easy to synthesize on a large scale, are cost-effective, are stable with long-term storage capability, and provide a more physiologically accurate environment for RPE cell culture. To our knowledge, no one has reported that PEG derivatives directly support attachment and growth of RPE cells with cobblestone morphology. This study offers a unique PEG-modified 3D cell culture system that supports RPE proliferation, differentiation, and maturation with cobblestone morphology, providing a new avenue for RPE cell culture, disease modeling, and cell replacement therapy.
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Affiliation(s)
- Yangzi Tian
- Colleges of Nanoscale Science and Engineering, SUNY Polytechnic Institute, 257 Fuller Road, Albany, New York 12203, United States
| | - Michael R Zonca
- Colleges of Nanoscale Science and Engineering, SUNY Polytechnic Institute, 257 Fuller Road, Albany, New York 12203, United States
| | - Joseph Imbrogno
- Howard P. Isermann Department of Chemical and Biological Engineering and Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute (RPI), Troy, New York 12180, United States
| | - Andrea M Unser
- Colleges of Nanoscale Science and Engineering, SUNY Polytechnic Institute, 257 Fuller Road, Albany, New York 12203, United States
| | - Lauren Sfakis
- Colleges of Nanoscale Science and Engineering, SUNY Polytechnic Institute, 257 Fuller Road, Albany, New York 12203, United States
| | - Sally Temple
- Neural Stem Cell Institute, One Discovery Drive, Rensselaer, New York 12144, United States
| | - Georges Belfort
- Howard P. Isermann Department of Chemical and Biological Engineering and Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute (RPI), Troy, New York 12180, United States
| | - Yubing Xie
- Colleges of Nanoscale Science and Engineering, SUNY Polytechnic Institute, 257 Fuller Road, Albany, New York 12203, United States
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11
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Prévôt M, Hegmann E. From Biomaterial, Biomimetic, and Polymer to Biodegradable and Biocompatible Liquid Crystal Elastomer Cell Scaffolds. ACS SYMPOSIUM SERIES 2017. [DOI: 10.1021/bk-2017-1253.ch001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- M. Prévôt
- Liquid Crystal Institute, Kent State University, Kent, Ohio 44242-0001, United States
- Chemical Physics Interdisciplinary Program, Kent State University, Kent, Ohio 44242-0001, United States
- Department of Biological Sciences, Kent State University, Kent, Ohio 44242-0001, United States
| | - E. Hegmann
- Liquid Crystal Institute, Kent State University, Kent, Ohio 44242-0001, United States
- Chemical Physics Interdisciplinary Program, Kent State University, Kent, Ohio 44242-0001, United States
- Department of Biological Sciences, Kent State University, Kent, Ohio 44242-0001, United States
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12
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Jia J, Coyle RC, Richards DJ, Berry CL, Barrs RW, Biggs J, James Chou C, Trusk TC, Mei Y. Development of peptide-functionalized synthetic hydrogel microarrays for stem cell and tissue engineering applications. Acta Biomater 2016; 45:110-120. [PMID: 27612960 PMCID: PMC5146757 DOI: 10.1016/j.actbio.2016.09.006] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Revised: 09/01/2016] [Accepted: 09/05/2016] [Indexed: 10/21/2022]
Abstract
Synthetic polymer microarray technology holds remarkable promise to rapidly identify suitable biomaterials for stem cell and tissue engineering applications. However, most of previous microarrayed synthetic polymers do not possess biological ligands (e.g., peptides) to directly engage cell surface receptors. Here, we report the development of peptide-functionalized hydrogel microarrays based on light-assisted copolymerization of poly(ethylene glycol) diacrylates (PEGDA) and methacrylated-peptides. Using solid-phase peptide/organic synthesis, we developed an efficient route to synthesize methacrylated-peptides. In parallel, we identified PEG hydrogels that effectively inhibit non-specific cell adhesion by using PEGDA-700 (M. W.=700) as a monomer. The combined use of these chemistries enables the development of a powerful platform to prepare peptide-functionalized PEG hydrogel microarrays. Additionally, we identified a linker composed of 4 glycines to ensure sufficient exposure of the peptide moieties from hydrogel surfaces. Further, we used this system to directly compare cell adhesion abilities of several related RGD peptides: RGD, RGDS, RGDSG and RGDSP. Finally, we combined the peptide-functionalized hydrogel technology with bioinformatics to construct a library composed of 12 different RGD peptides, including 6 unexplored RGD peptides, to develop culture substrates for hiPSC-derived cardiomyocytes (hiPSC-CMs), a cell type known for poor adhesion to synthetic substrates. 2 out of 6 unexplored RGD peptides showed substantial activities to support hiPSC-CMs. Among them, PMQKMRGDVFSP from laminin β4 subunit was found to support the highest adhesion and sarcomere formation of hiPSC-CMs. With bioinformatics, the peptide-functionalized hydrogel microarrays accelerate the discovery of novel biological ligands to develop biomaterials for stem cell and tissue engineering applications. STATEMENT OF SIGNIFICANCE In this manuscript, we described the development of a robust approach to prepare peptide-functionalized synthetic hydrogel microarrays. Combined with bioinformatics, this technology enables us to rapidly identify novel biological ligands for the development of the next generation of functional biomaterials for stem cell and tissue engineering applications.
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Affiliation(s)
- Jia Jia
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA
| | - Robert C Coyle
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA
| | - Dylan J Richards
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA
| | | | - Ryan Walker Barrs
- College of Engineering and Computing, University of South Carolina, Columbia, SC 29208, USA
| | - Joshua Biggs
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA
| | - C James Chou
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Thomas C Trusk
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Ying Mei
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA; Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA.
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Hosseinzadeh S, Rezayat SM, Vashegani-Farahani E, Mahmoudifard M, Zamanlui S, Soleimani M. Nanofibrous hydrogel with stable electrical conductivity for biological applications. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.05.013] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Soloperto A, Palazzolo G, Tsushima H, Chieregatti E, Vassalli M, Difato F. Laser Nano-Neurosurgery from Gentle Manipulation to Nano-Incision of Neuronal Cells and Scaffolds: An Advanced Neurotechnology Tool. Front Neurosci 2016; 10:101. [PMID: 27013962 PMCID: PMC4786546 DOI: 10.3389/fnins.2016.00101] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 02/26/2016] [Indexed: 11/13/2022] Open
Abstract
Current optical approaches are progressing far beyond the scope of monitoring the structure and function of living matter, and they are becoming widely recognized as extremely precise, minimally-invasive, contact-free handling tools. Laser manipulation of living tissues, single cells, or even single-molecules is becoming a well-established methodology, thus founding the onset of new experimental paradigms and research fields. Indeed, a tightly focused pulsed laser source permits complex tasks such as developing engineered bioscaffolds, applying calibrated forces, transfecting, stimulating, or even ablating single cells with subcellular precision, and operating intracellular surgical protocols at the level of single organelles. In the present review, we report the state of the art of laser manipulation in neuroscience, to inspire future applications of light-assisted tools in nano-neurosurgery.
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Affiliation(s)
- Alessandro Soloperto
- Neuroscience and Brain Technologies Department, Istituto Italiano di Tecnologia Genoa, Italy
| | - Gemma Palazzolo
- Neuroscience and Brain Technologies Department, Istituto Italiano di Tecnologia Genoa, Italy
| | - Hanako Tsushima
- Neuroscience and Brain Technologies Department, Istituto Italiano di Tecnologia Genoa, Italy
| | - Evelina Chieregatti
- Neuroscience and Brain Technologies Department, Istituto Italiano di Tecnologia Genoa, Italy
| | - Massimo Vassalli
- Institute of Biophysics, National Research Council of Italy Genoa, Italy
| | - Francesco Difato
- Neuroscience and Brain Technologies Department, Istituto Italiano di Tecnologia Genoa, Italy
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15
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Choi JS, Harley BAC. Challenges and Opportunities to Harnessing the (Hematopoietic) Stem Cell Niche. CURRENT STEM CELL REPORTS 2016; 2:85-94. [PMID: 27134819 PMCID: PMC4845958 DOI: 10.1007/s40778-016-0031-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
In our body, stem cells reside in a microenvironment termed the niche. While the exact composition and therefore the level of complexity of a stem cell niche can vary significantly tissue-to-tissue, the stem cell niche microenvironment is dynamic, typically containing spatial and temporal variations in both cellular, extracellular matrix, and biomolecular components. This complex flow of secreted or bound biomolecules, cytokines, extracellular matrix components, and cellular constituents all contribute to the regulation of stem cell fate specification events, making engineering approaches at the nano- and micro-scale of particular interest for creating an artificial niche environment in vitro. Recent advances in fabrication approaches have enabled biomedical researchers to capture and recreate the complexity of stem cell niche microenvironments in vitro. Such engineered platforms show promise as a means to enhance our understanding of the mechanisms underlying niche-mediated stem cell regulation as well as offer opportunities to precisely control stem cell expansion and differentiation events for clinical applications. While these principles generally apply to all adult stem cells and niches, in this review, we focus on recent developments in engineering synthetic niche microenvironments for one of the best-characterized stem cell populations, hematopoietic stem cells (HSC). Specifically, we highlight recent advances in platforms designed to facilitate the extrinsic control of HSC fate decisions.
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Affiliation(s)
- Ji Sun Choi
- Dept. Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
| | - Brendan A C Harley
- Dept. Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801; Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801
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16
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Wu Y, Chen YX, Yan J, Quinn D, Dong P, Sawyer SW, Soman P. Fabrication of conductive gelatin methacrylate-polyaniline hydrogels. Acta Biomater 2016; 33:122-30. [PMID: 26821341 DOI: 10.1016/j.actbio.2016.01.036] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 01/11/2016] [Accepted: 01/23/2016] [Indexed: 10/22/2022]
Abstract
Hydrogels with inherently conductive properties have been recently developed for tissue engineering applications, to serve as bioactive scaffolds to electrically stimulate cells and modulate their function. In this work, we have used interfacial polymerization of aniline monomers within gelatin methacrylate (GelMA) to develop a conductive hybrid composite. We demonstrate that as compared to pure GelMA, GelMA-polyaniline (GelMA-Pani) composite has similar swelling properties and compressive modulus, comparable cell adhesion and spreading responses, and superior electrical properties. Additionally, we demonstrate that GelMA-Pani composite can be printed in complex user-defined geometries using digital projection stereolithography, and will be useful in developing next-generation bioelectrical interfaces. STATEMENT OF SIGNIFICANCE We report the fabrication of a conductive hydrogel using naturally-derived gelatin methyacrylate (GelMA) and inherently conductive polyaniline (Pani). This work is significant, as GelMA-Pani composite has superior electrical properties as compared to pure Gelma, all the while maintaining biomimetic physical and biocompatible properties. Moreover, the ability to fabricate conductive-GelMA in complex user-defined micro-geometries, address the significant processing challenges associated with all inherently conductive polymers including Pani. The methodology described in this work can be extended to several conductive polymers and hydrogels, to develop new biocompatible electrically active interfaces.
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17
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Ribeiro AJS, Denisin AK, Wilson RE, Pruitt BL. For whom the cells pull: Hydrogel and micropost devices for measuring traction forces. Methods 2016; 94:51-64. [PMID: 26265073 PMCID: PMC4746112 DOI: 10.1016/j.ymeth.2015.08.005] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2015] [Revised: 07/10/2015] [Accepted: 08/06/2015] [Indexed: 01/16/2023] Open
Abstract
While performing several functions, adherent cells deform their surrounding substrate via stable adhesions that connect the intracellular cytoskeleton to the extracellular matrix. The traction forces that deform the substrate are studied in mechanotrasduction because they are affected by the mechanics of the extracellular milieu. We review the development and application of two methods widely used to measure traction forces generated by cells on 2D substrates: (i) traction force microscopy with polyacrylamide hydrogels and (ii) calculation of traction forces with arrays of deformable microposts. Measuring forces with these methods relies on measuring substrate displacements and converting them into forces. We describe approaches to determine force from displacements and elaborate on the necessary experimental conditions for this type of analysis. We emphasize device fabrication, mechanical calibration of substrates and covalent attachment of extracellular matrix proteins to substrates as key features in the design of experiments to measure cell traction forces with polyacrylamide hydrogels or microposts. We also report the challenges and achievements in integrating these methods with platforms for the mechanical stimulation of adherent cells. The approaches described here will enable new studies to understand cell mechanical outputs as a function of mechanical inputs and advance the understanding of mechanotransduction mechanisms.
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Affiliation(s)
- Alexandre J S Ribeiro
- Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, United States; Stanford Cardiovascular Institute, Stanford University, Stanford, CA 94305, United States
| | - Aleksandra K Denisin
- Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, United States; Stanford Bioengineering, Stanford University, Stanford, CA 94305, United States
| | - Robin E Wilson
- Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, United States
| | - Beth L Pruitt
- Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, United States; Stanford Cardiovascular Institute, Stanford University, Stanford, CA 94305, United States; Department of Molecular and Cellular Physiology, Stanford University, Stanford, CA 94305, United States.
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18
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Dong D, Li J, Cui M, Wang J, Zhou Y, Luo L, Wei Y, Ye L, Sun H, Yao F. In Situ "Clickable" Zwitterionic Starch-Based Hydrogel for 3D Cell Encapsulation. ACS APPLIED MATERIALS & INTERFACES 2016; 8:4442-4455. [PMID: 26817499 DOI: 10.1021/acsami.5b12141] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Three-dimensional (3D) cell encapsulation in hydrogel provides superb methods to investigate the biochemical cues in directing cellular fate and behaviors outside the organism, the primary step of which is to establish suitable "blank platform" to mimic and simplify native ECM microenvironment. In this study, zwitterionic starch-based "clickable" hydrogels were fabricated via a "copper- and light- free" Michael-type "thiol-ene" addition reaction between acylated-modified sulfobetaine-derived starch (SB-ST-A) and dithiol-functionalized poly(ethylene glycol) (PEG-SH). By incorporating antifouling SB-ST and PEG, the hydrogel system would be excellently protected from nontarget protein adsorption to act as a "blank platform". The hydrogels could rapidly gel under physiological conditions in less than 7 min. Dynamic rheology experiments suggested the stiffness of the hydrogel was close to the native tissues, and the mechanical properties as well as the gelation times and swelling behaviors could be easily tuned by varying the precursor proportions. The protein and cell adhesion assays demonstrated that the hydrogel surface could effectively resist nonspecific protein and cell adhesion. The degradation study in vitro confirmed that the hydrogel was biodegradable. A549 cells encapsulated in the hydrogel maintained high viability (up to 93%) and started to proliferate in number and extend in morphology after 2 days' culture. These results indicated the hydrogel presented here could be a potential candidate as "blank platform" for 3D cell encapsulation and biochemical cues induced cellular behavior investigation in vitro.
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Affiliation(s)
- Dianyu Dong
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, China
| | - Junjie Li
- Department of Advanced Interdisciplinary Studies, Institute of Basic Medical Sciences and Tissue Engineering Research Center, Academy of Military Medical Sciences , Beijing 100850, China
| | - Man Cui
- Department of Basic Medical Sciences, North China University of Science and Technology , Tangshan 063000, China
| | - Jinmei Wang
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, China
| | - Yuhang Zhou
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, China
| | - Liu Luo
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, China
| | - Yufei Wei
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, China
| | - Lei Ye
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, China
| | - Hong Sun
- Department of Basic Medical Sciences, North China University of Science and Technology , Tangshan 063000, China
| | - Fanglian Yao
- School of Chemical Engineering and Technology, Tianjin University , Tianjin 300072, China
- Key Laboratory of Systems Bioengineering, Ministry of Education, Tianjin University , Tianjin 300072, China
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19
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Kador KE, Grogan SP, Dorthé EW, Venugopalan P, Malek MF, Goldberg JL, D'lima DD. Control of Retinal Ganglion Cell Positioning and Neurite Growth: Combining 3D Printing with Radial Electrospun Scaffolds. Tissue Eng Part A 2016; 22:286-94. [PMID: 26729061 DOI: 10.1089/ten.tea.2015.0373] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Retinal ganglion cells (RGCs) are responsible for the transfer of signals from the retina to the brain. As part of the central nervous system, RGCs are unable to regenerate following injury, and implanted cells have limited capacity to orient and integrate in vivo. During development, secreted guidance molecules along with signals from extracellular matrix and the vasculature guide cell positioning, for example, around the fovea, and axon outgrowth; however, these changes are temporally regulated and are not the same in the adult. Here, we combine electrospun cell transplantation scaffolds capable of RGC neurite guidance with thermal inkjet 3D cell printing techniques capable of precise positioning of RGCs on the scaffold surface. Optimal printing parameters are developed for viability, electrophysiological function and, neurite pathfinding. Different media, commonly used to promote RGC survival and growth, were tested under varying conditions. When printed in growth media containing both brain-derived neurotrophic factor (BDNF) and ciliary neurotrophic factor (CNTF), RGCs maintained survival and normal electrophysiological function, and displayed radial axon outgrowth when printed onto electrospun scaffolds. These results demonstrate that 3D printing technology may be combined with complex electrospun surfaces in the design of future retinal models or therapies.
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Affiliation(s)
- Karl E Kador
- 1 Shiley Eye Institute and Institute of Engineering in Medicine, University of California San Diego , La Jolla, California
| | - Shawn P Grogan
- 2 Shiley Center for Orthopaedic Research and Education at Scripps Clinic , La Jolla, California
| | - Erik W Dorthé
- 2 Shiley Center for Orthopaedic Research and Education at Scripps Clinic , La Jolla, California
| | - Praseeda Venugopalan
- 1 Shiley Eye Institute and Institute of Engineering in Medicine, University of California San Diego , La Jolla, California
| | - Monisha F Malek
- 1 Shiley Eye Institute and Institute of Engineering in Medicine, University of California San Diego , La Jolla, California
| | - Jeffrey L Goldberg
- 1 Shiley Eye Institute and Institute of Engineering in Medicine, University of California San Diego , La Jolla, California.,3 Byers Eye Institute, Stanford University , Palo Alto, California
| | - Darryl D D'lima
- 2 Shiley Center for Orthopaedic Research and Education at Scripps Clinic , La Jolla, California
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20
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Nalawade AC, Ghorpade RV, Shadbar S, Qureshi MS, Chavan NN, Khan AA, Ponrathnam S. Inverse high internal phase emulsion polymerization (i-HIPE) of GMMA, HEMA and GDMA for the preparation of superporous hydrogels as a tissue engineering scaffold. J Mater Chem B 2015; 4:450-460. [PMID: 32263209 DOI: 10.1039/c5tb01873k] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A series of novel superporous hydrogels for regenerative medicine were prepared by oil-in-water (o/w) or inverse high internal phase emulsion (i-HIPE) copolymerization of glycerol monomethacrylate (GMMA), 2-hydroxy ethyl methacrylate (HEMA) and glycerol dimethacrylate (GDMA) as a cross-linker using a non toxic solvent and a redox initiator system at the physiological temperature (37 °C). The monomer GMMA was synthesized from glycidyl methacrylate (GMA) by an alternative facile method using Amberlyst-15. The described i-HIPEs showed a significantly wider stability window. The polyHIPE hydrogels were characterized by FTIR, BET method for surface area, mercury porosimetry, SEM, DSC, TGA, XRD, compressive strain and strain recovery. The swelling ratio of the hydrogels and their degradation in 0.007 M NaOH and lipase B (Candida antarctica) solutions were determined gravimetrically and the rate of degradation was explained in terms of the molecular structure of the hydrogels. The morphological studies showed that the pore diameter varied between 20 and 30 μm and the pore throats (interconnecting windows) diameter was in the range of 4-8 μm. The described polyHIPE hydrogels were found to have an open cell morphology and interconnected pore architecture, which are important characteristics for scaffold applications. The initial cytotoxicity study performed according to ISO-10993-5 indicated cytocompatibility (97% cell viability) and the subsequent cell seeding and proliferation study exhibited 55-88% cell viability (increased monotonously from GHG-1 to GHG-5), which could be attributed to modulation of the physical and chemical properties of the hydrogels. The described super porous hydrogels are considered as potential candidates for scaffold materials in tissue engineering applications.
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Affiliation(s)
- Archana C Nalawade
- Chemical Engineering and Process Development Division, National Chemical Laboratory, Council of Scientific and Industrial Research (CSIR), Pune-411008, India.
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21
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Yang YJ, Kim CS, Choi BH, Cha HJ. Mechanically Durable and Biologically Favorable Protein Hydrogel Based on Elastic Silklike Protein Derived from Sea Anemone. Biomacromolecules 2015; 16:3819-26. [DOI: 10.1021/acs.biomac.5b01130] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Yun Jung Yang
- Department
of Chemical Engineering, Pohang University of Science and Technology, Pohang, 790-784, Korea
| | - Chang Sup Kim
- Department
of Chemical Engineering, Pohang University of Science and Technology, Pohang, 790-784, Korea
- School
of Biotechnology and Graduate School of Biochemistry, Yeungnam University, Gyeongsan, 712-749, Korea
| | - Bong-Hyuk Choi
- Department
of Chemical Engineering, Pohang University of Science and Technology, Pohang, 790-784, Korea
| | - Hyung Joon Cha
- Department
of Chemical Engineering, Pohang University of Science and Technology, Pohang, 790-784, Korea
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22
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Lewis KJR, Tibbitt MW, Zhao Y, Branchfield K, Sun X, Balasubramaniam V, Anseth KS. In vitro model alveoli from photodegradable microsphere templates. Biomater Sci 2015; 3:821-32. [PMID: 26221842 PMCID: PMC4871129 DOI: 10.1039/c5bm00034c] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Recreating the 3D cyst-like architecture of the alveolar epithelium in vitro has been challenging to achieve in a controlled fashion with primary lung epithelial cells. Here, we demonstrate model alveoli formed within a tunable synthetic biomaterial platform using photodegradable microspheres as templates to create physiologically relevant, cyst structures. Poly(ethylene glycol) (PEG)-based hydrogels were polymerized in suspension to form microspheres on the order of 120 μm in diameter. The gel chemistry was designed to allow erosion of the microspheres with cytocompatible light doses (≤15 min exposure to 10 mW cm(-2) of 365 nm light) via cleavage of a photolabile nitrobenzyl ether crosslinker. Epithelial cells were incubated with intact microspheres, modified with adhesive peptide sequences to facilitate cellular attachment to and proliferation on the surface. A tumor-derived alveolar epithelial cell line, A549, completely covered the microspheres after only 24 hours, whereas primary mouse alveolar epithelial type II (ATII) cells took ∼3 days. The cell-laden microsphere structures were embedded within a second hydrogel formulation at user defined densities; the microsphere templates were subsequently removed with light to render hollow epithelial cysts that were cultured for an additional 6 days. The resulting primary cysts stained positive for cell-cell junction proteins (β-catenin and ZO-1), indicating the formation of a functional epithelial layer. Typically, primary ATII cells differentiated in culture to the alveolar epithelial type I (ATI) phenotype; however, each cyst contained ∼1-5 cells that stained positive for an ATII marker (surfactant protein C), which is consistent with ATII cell numbers in native mouse alveoli. This biomaterial-templated alveoli culture system should be useful for future experiments to study lung development and disease progression, and is ideally suited for co-culture experiments where pulmonary fibroblasts or endothelial cells could be presented in the hydrogel surrounding the epithelial cysts.
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Affiliation(s)
- Katherine J R Lewis
- Department of Chemical and Biological Engineering, the BioFrontiers Institute, and the Howard Hughes Medical Institute, University of Colorado at Boulder, 3415 Colorado Ave, 596 UCB, Boulder, CO 80303, USA.
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23
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Dextran-based hydrogel formed by thiol-Michael addition reaction for 3D cell encapsulation. Colloids Surf B Biointerfaces 2015; 128:140-148. [DOI: 10.1016/j.colsurfb.2015.02.005] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2014] [Revised: 01/31/2015] [Accepted: 02/02/2015] [Indexed: 12/17/2022]
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24
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Fan C, Wang DA. Effects of permeability and living space on cell fate and neo-tissue development in hydrogel-based scaffolds: a study with cartilaginous model. Macromol Biosci 2015; 15:535-45. [PMID: 25557976 DOI: 10.1002/mabi.201400453] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Revised: 11/27/2014] [Indexed: 01/20/2023]
Abstract
One bottleneck in tissue regeneration with hydrogel scaffolds is the limited understanding of the crucial factors for controlling hydrogel's physical microenvironments to regulate cell fate. Here, the effects of permeability and living space of hydrogels on encapsulated cells' behavior were evaluated, respectively. Three model hydrogel-based constructs are fabricated by using photo-crosslinkable hyaluronic acid as precursor and chondrocytes as model cell type. The better permeable hydrogels facilitate better cell viability and rapid proliferation, which lead to increased production of extracellular matrix (ECM), e.g. collagen, glycosaminoglycan. By prolonged culture, nano-sized hydrogel networks inhibit neo-tissue development, and the presence of macro-porous living spaces significantly enhance ECM deposition via forming larger cell clusters and eventually induce formation of scaffold-free neo-tissue islets. The results of this work demonstrate that the manipulation and optimization of hydrogel microenvironments, namely permeability and living space, are crucial to direct cell fate and neo-tissue formation.
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Affiliation(s)
- Changjiang Fan
- Division of Bioengineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637457
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25
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Wu Y, Chen YX, Yan J, Yang S, Dong P, Soman P. Fabrication of conductive polyaniline hydrogel using porogen leaching and projection microstereolithography. J Mater Chem B 2015; 3:5352-5360. [DOI: 10.1039/c5tb00629e] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A PEGda–PANI conductive hydrogel developed using interfacial polymerization process can be applied to range of fabrication methodologies.
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Affiliation(s)
- Yibo Wu
- Department of Biomedical and Chemical Engineering
- Syracuse University
- Syracuse
- USA
| | - Yong X. Chen
- Department of Biomedical and Chemical Engineering
- Syracuse University
- Syracuse
- USA
| | - Jiahan Yan
- Department of Biomedical and Chemical Engineering
- Syracuse University
- Syracuse
- USA
| | - Shihao Yang
- Department of Biomedical and Chemical Engineering
- Syracuse University
- Syracuse
- USA
| | - Ping Dong
- Department of Biomedical and Chemical Engineering
- Syracuse University
- Syracuse
- USA
| | - Pranav Soman
- Department of Biomedical and Chemical Engineering
- Syracuse University
- Syracuse
- USA
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26
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Tuft BW, Zhang L, Xu L, Hangartner A, Leigh B, Hansen MR, Guymon CA. Material stiffness effects on neurite alignment to photopolymerized micropatterns. Biomacromolecules 2014; 15:3717-27. [PMID: 25211120 PMCID: PMC4195519 DOI: 10.1021/bm501019s] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The ability to direct neurite growth into a close proximity of stimulating elements of a neural prosthesis, such as a retinal or cochlear implant (CI), may enhance device performance and overcome current spatial signal resolution barriers. In this work, spiral ganglion neurons (SGNs), which are the target neurons to be stimulated by CIs, were cultured on photopolymerized micropatterns with varied matrix stiffnesses to determine the effect of rigidity on neurite alignment to physical cues. Micropatterns were generated on methacrylate thin film surfaces in a simple, rapid photopolymerization step by photomasking the prepolymer formulation with parallel line-space gratings. Two methacrylate series, a nonpolar HMA-co-HDDMA series and a polar PEGDMA-co-EGDMA series, with significantly different surface wetting properties were evaluated. Equivalent pattern periodicity was maintained across each methacrylate series based on photomask band spacing, and the feature amplitude was tuned to a depth of 2 μm amplitude for all compositions using the temporal control afforded by the UV curing methodology. The surface morphology was characterized by scanning electron microscopy and white light interferometry. All micropatterned films adsorb similar amounts of laminin from solution, and no significant difference in SGN survival was observed when the substrate compositions were compared. SGN neurite alignment significantly increases with increasing material modulus for both methacrylate series. Interestingly, SGN neurites respond to material stiffness cues that are orders of magnitude higher (GPa) than what is typically ascribed to neural environments (kPa). The ability to understand neurite response to engineered physical cues and mechanical properties such as matrix stiffness will allow the development of advanced biomaterials that direct de novo neurite growth to address the spatial signal resolution limitations of current neural prosthetics.
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Affiliation(s)
- Bradley W Tuft
- Department of Chemical and Biochemical Engineering, University of Iowa , Iowa City, Iowa 52242, United States
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27
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Jia J, Richards DJ, Pollard S, Tan Y, Rodriguez J, Visconti RP, Trusk TC, Yost MJ, Yao H, Markwald RR, Mei Y. Engineering alginate as bioink for bioprinting. Acta Biomater 2014. [PMID: 24998183 DOI: 10.1016/j.actbio.2014.06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
Abstract
Recent advances in three-dimensional (3-D) printing offer an excellent opportunity to address critical challenges faced by current tissue engineering approaches. Alginate hydrogels have been used extensively as bioinks for 3-D bioprinting. However, most previous research has focused on native alginates with limited degradation. The application of oxidized alginates with controlled degradation in bioprinting has not been explored. Here, a collection of 30 different alginate hydrogels with varied oxidation percentages and concentrations was prepared to develop a bioink platform that can be applied to a multitude of tissue engineering applications. The authors systematically investigated the effects of two key material properties (i.e. viscosity and density) of alginate solutions on their printabilities to identify a suitable range of material properties of alginates to be applied to bioprinting. Further, four alginate solutions with varied biodegradability were printed with human adipose-derived stem cells (hADSCs) into lattice-structured, cell-laden hydrogels with high accuracy. Notably, these alginate-based bioinks were shown to be capable of modulating proliferation and spreading of hADSCs without affecting the structure integrity of the lattice structures (except the highly degradable one) after 8days in culture. This research lays a foundation for the development of alginate-based bioink for tissue-specific tissue engineering applications.
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Affiliation(s)
- Jia Jia
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA
| | - Dylan J Richards
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA
| | - Samuel Pollard
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA
| | - Yu Tan
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA
| | - Joshua Rodriguez
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA
| | - Richard P Visconti
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Thomas C Trusk
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Michael J Yost
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Hai Yao
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA; Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Roger R Markwald
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Ying Mei
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA; Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA.
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28
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Jia J, Richards DJ, Pollard S, Tan Y, Rodriguez J, Visconti RP, Trusk TC, Yost MJ, Yao H, Markwald RR, Mei Y. Engineering alginate as bioink for bioprinting. Acta Biomater 2014; 10:4323-31. [PMID: 24998183 PMCID: PMC4350909 DOI: 10.1016/j.actbio.2014.06.034] [Citation(s) in RCA: 304] [Impact Index Per Article: 30.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Revised: 06/06/2014] [Accepted: 06/20/2014] [Indexed: 10/25/2022]
Abstract
Recent advances in three-dimensional (3-D) printing offer an excellent opportunity to address critical challenges faced by current tissue engineering approaches. Alginate hydrogels have been used extensively as bioinks for 3-D bioprinting. However, most previous research has focused on native alginates with limited degradation. The application of oxidized alginates with controlled degradation in bioprinting has not been explored. Here, a collection of 30 different alginate hydrogels with varied oxidation percentages and concentrations was prepared to develop a bioink platform that can be applied to a multitude of tissue engineering applications. The authors systematically investigated the effects of two key material properties (i.e. viscosity and density) of alginate solutions on their printabilities to identify a suitable range of material properties of alginates to be applied to bioprinting. Further, four alginate solutions with varied biodegradability were printed with human adipose-derived stem cells (hADSCs) into lattice-structured, cell-laden hydrogels with high accuracy. Notably, these alginate-based bioinks were shown to be capable of modulating proliferation and spreading of hADSCs without affecting the structure integrity of the lattice structures (except the highly degradable one) after 8days in culture. This research lays a foundation for the development of alginate-based bioink for tissue-specific tissue engineering applications.
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Affiliation(s)
- Jia Jia
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA
| | - Dylan J Richards
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA
| | - Samuel Pollard
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA
| | - Yu Tan
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA
| | - Joshua Rodriguez
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA
| | - Richard P Visconti
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Thomas C Trusk
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Michael J Yost
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Hai Yao
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA; Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Roger R Markwald
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Ying Mei
- Bioengineering Department, Clemson University, Clemson, SC 29634, USA; Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC 29425, USA.
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García-Fernández L, Herbivo C, Arranz VSM, Warther D, Donato L, Specht A, del Campo A. Dual photosensitive polymers with wavelength-selective photoresponse. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2014; 26:5012-5017. [PMID: 24831417 DOI: 10.1002/adma.201401290] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2014] [Revised: 04/25/2014] [Indexed: 06/03/2023]
Abstract
Polyurethane thin films that photopolymerize and photodegrade upon exposure to light of different wavelengths are presented. The chromic response is based on two caged monomers with the ability to be activated or photocleaved with different wavelengths under single and two-photon excitation. This material represents a dual photoresist with "positive" and "negative" tone contained in a single resist formulation and with the ability to generate complex 2D and 3D patterns.
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