1
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Mietzner R, Barbey C, Lehr H, Ziegler CE, Peterhoff D, Wagner R, Goepferich A, Breunig M. Prolonged delivery of HIV-1 vaccine nanoparticles from hydrogels. Int J Pharm 2024; 657:124131. [PMID: 38643811 DOI: 10.1016/j.ijpharm.2024.124131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Revised: 04/14/2024] [Accepted: 04/15/2024] [Indexed: 04/23/2024]
Abstract
Immunization is a straightforward concept but remains for some pathogens like HIV-1 a challenge. Thus, new approaches towards increasing the efficacy of vaccines are required to turn the tide. There is increasing evidence that antigen exposure over several days to weeks induces a much stronger and more sustained immune response compared to traditional bolus injection, which usually leads to antigen elimination from the body within a couple of days. Therefore, we developed a poly(ethylene) glycol (PEG) hydrogel platform to investigate the principal feasibility of a sustained release of antigens to mimic natural infection kinetics. Eight-and four-armed PEG macromonomers of different MWs (10, 20, and 40 kDa) were end-group functionalized to allow for hydrogel formation via covalent cross-linking. An HIV-1 envelope (Env) antigen in its trimeric (Envtri) or monomeric (Envmono) form was applied. The soluble Env antigen was compared to a formulation of Env attached to silica nanoparticles (Env-SiNPs). The latter are known to have a higher immunogenicity compared to their soluble counterparts. Hydrogels were tunable regarding the rheological behavior allowing for different degradation times and release timeframes of Env-SiNPs over two to up to 50 days. Affinity measurements of the VCR01 antibody which specifically recognizes the CD4 binding site of Env, revealed that neither the integrity nor the functionality of Envmono-SiNPs (Kd = 2.1 ± 0.9 nM) and Envtri-SiNPs (Kd = 1.5 ± 1.3 nM), respectively, were impaired after release from the hydrogel (Kd before release: 2.1 ± 0.1 and 7.8 ± 5.3 nM, respectively). Finally, soluble Env and Env-SiNPs which are two physico-chemically distinct compounds, were co-delivered and shown to be sequentially released from one hydrogel which could be beneficial in terms of heterologous immunization or single dose vaccination. In summary, this study presents a tunable, versatile applicable, and effective delivery platform that could improve vaccination effectiveness also for other infectious diseases than HIV-1.
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Affiliation(s)
- Raphael Mietzner
- Department of Pharmaceutical Technology, University of Regensburg, Universitaetsstrasse 31, 93040 Regensburg, Germany
| | - Clara Barbey
- Department of Pharmaceutical Technology, University of Regensburg, Universitaetsstrasse 31, 93040 Regensburg, Germany
| | - Heike Lehr
- Department of Pharmaceutical Technology, University of Regensburg, Universitaetsstrasse 31, 93040 Regensburg, Germany
| | - Christian E Ziegler
- Department of Pharmaceutical Technology, University of Regensburg, Universitaetsstrasse 31, 93040 Regensburg, Germany
| | - David Peterhoff
- Institute of Medical Microbiology and Hygiene, University of Regensburg, Universitaetsstrasse 31, 93040 Regensburg, Germany; Institute of Clinical Microbiology and Hygiene, University Hospital Regensburg, Regensburg, Germany
| | - Ralf Wagner
- Institute of Medical Microbiology and Hygiene, University of Regensburg, Universitaetsstrasse 31, 93040 Regensburg, Germany; Institute of Clinical Microbiology and Hygiene, University Hospital Regensburg, Regensburg, Germany
| | - Achim Goepferich
- Department of Pharmaceutical Technology, University of Regensburg, Universitaetsstrasse 31, 93040 Regensburg, Germany
| | - Miriam Breunig
- Department of Pharmaceutical Technology, University of Regensburg, Universitaetsstrasse 31, 93040 Regensburg, Germany.
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2
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Jungmann M, Recalde Phillips S, Touchet TJ, Brinson B, Parish K, Petersen C, Hasan SM, Nash LD, Maitland DJ, Alge DL. Swellable and Thermally Responsive Hydrogel/Shape Memory Polymer Foam Composites for Sealing Lung Biopsy Tracts. ACS Biomater Sci Eng 2023; 9:642-650. [PMID: 36729490 PMCID: PMC10726527 DOI: 10.1021/acsbiomaterials.2c01369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Accepted: 01/19/2023] [Indexed: 02/03/2023]
Abstract
Lung tissue biopsies can result in a leakage of blood (hemothorax) and air (pneumothorax) from the biopsy tract, which threatens the patient with a collapsed lung and other complications. We have developed a lung biopsy tract sealant based on a thiol-ene-crosslinked PEG hydrogel and polyurethane shape memory polymer (SMP) foam composite. After insertion into biopsy tracts, the PEG hydrogel component contributes to sealing through water-driven swelling, whereas the SMP foam contributes to sealing via thermal actuation. The gelation kinetics, swelling properties, and rheological properties of various hydrogel formulations were studied to determine the optimal formulation for composite fabrication. Composites were then fabricated via vacuum infiltration of the PEG hydrogel precursors into the SMP foam followed by thermal curing. After drying, the composites were crimped to enable insertion into biopsy tracts. Characterization revealed that the composites exhibited a slight delay in shape recovery compared to control SMP foams. However, the composites were still able to recover their shape in a matter of minutes. Cytocompatibility testing showed that leachable byproducts can be easily removed by washing and washed composites were not cytotoxic to mouse lung fibroblasts (L929s). Benchtop testing demonstrated that the composites can be easily deployed through a cannula, and the working time for deployment after exposure to water was 2 min. Furthermore, testing in an in vitro lung model demonstrated that the composites were able to effectively seal a lung biopsy tract and prevent air leakage. Collectively, these results show that the PEG hydrogel/SMP foam composites have the potential to be used as lung biopsy tract sealants to prevent pneumothorax post-lung biopsy.
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Affiliation(s)
- Matthew
A. Jungmann
- Department
of Biomedical Engineering, Texas A&M
University, College
Station, Texas 77843, United States
| | - Sarea Recalde Phillips
- Department
of Biomedical Engineering, Texas A&M
University, College
Station, Texas 77843, United States
| | - Tyler J. Touchet
- Department
of Biomedical Engineering, Texas A&M
University, College
Station, Texas 77843, United States
| | - Braeden Brinson
- Department
of Biomedical Engineering, Texas A&M
University, College
Station, Texas 77843, United States
| | - Katherine Parish
- Department
of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Corinne Petersen
- Department
of Biomedical Engineering, Texas A&M
University, College
Station, Texas 77843, United States
| | | | - Landon D. Nash
- Shape
Memory Medical, Inc., Santa Clara, California 95054, United States
| | - Duncan J. Maitland
- Department
of Biomedical Engineering, Texas A&M
University, College
Station, Texas 77843, United States
- Shape
Memory Medical, Inc., Santa Clara, California 95054, United States
| | - Daniel L. Alge
- Department
of Biomedical Engineering, Texas A&M
University, College
Station, Texas 77843, United States
- Department
of Materials Science & Engineering, Texas A&M University, College Station, Texas 77843, United States
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3
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Bal T, Karaoglu IC, Murat FS, Yalcin E, Sasaki Y, Akiyoshi K, Kizilel S. Immunological response of polysaccharide nanogel-incorporating PEG hydrogels in an in vivo diabetic model. J Biomater Sci Polym Ed 2022; 33:1794-1810. [PMID: 35549832 DOI: 10.1080/09205063.2022.2077512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 05/09/2022] [Accepted: 05/11/2022] [Indexed: 06/15/2023]
Abstract
Cell-based therapies hold significant advantages in comparison with the traditional drug-based or injection-based treatments. However, for long-term functional cellular implants, immune acceptance must be established. To accomplish the acceptance of the implanted cells, various biomaterial systems have been studied. Nanogels have shown great potential for modulation of cellular microenvironments, acting as a physical barrier between the immune system and the implant. However, internalization of nano-scale materials by implanted cells is not desirable and is yet to be overcome. In this study, we incorporated acrylate modified cholesterol-bearing pullulan (CHPOA) nanogels into poly (ethylene glycol) diacrylate (PEGDA) hydrogels through covalent crosslinking, where we used visible light-induced photopolymerization. We characterized morphology and swelling properties of CHPOA incorporated PEG composite hydrogels using FE-SEM and gravimetric analysis. Also, we investigated the biocompatibility properties of composite hydrogels in vivo, where we used both healthy and diabetic mice. We induced diabetes in mice using a low dose streptozotocin (STZ) injections and implanted composite hydrogels in both diabetic and healthy mice through subcutaneous route. Immune cell infiltration of the retrieved tissue was examined through histological analysis, where we observed minimum immune response levels of 0-2 rareness, according to ISO standard of biological evaluation of medical devices. Our observation suggests that the composite hydrogel developed here can be used to introduce nanostructured domains into bulk hydrogels and that this system has potential to be used as immunologically acceptable composite material in cellular therapy without internalization of nanoparticles.
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Affiliation(s)
- Tugba Bal
- Chemical and Biological Engineering, Koc University, Istanbul, Sariyer, Turkey
| | - Ismail Can Karaoglu
- Chemical and Biological Engineering, Koc University, Istanbul, Sariyer, Turkey
| | - Fusun Sevval Murat
- Chemical and Biological Engineering, Koc University, Istanbul, Sariyer, Turkey
| | - Esra Yalcin
- Biomedical Science and Engineering, Koc University, Istanbul, Sariyer, Turkey
| | - Yoshihiro Sasaki
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University Katsura, Kyoto, Japan
| | - Kazunari Akiyoshi
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University Katsura, Kyoto, Japan
- Japan Science and Technology Agency (JST), The Exploratory Research for Advanced Technology (ERATO), Bio-nanotransporter Project, Katsura Int'tech Center, Kyoto, Japan
| | - Seda Kizilel
- Chemical and Biological Engineering, Koc University, Istanbul, Sariyer, Turkey
- Biomedical Science and Engineering, Koc University, Istanbul, Sariyer, Turkey
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4
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Park J, Kim N, Jung KI, Yoon S, Noh SM, Bang J, Jung HW. Effect of Silica Nanoparticles Blocked with Epoxy Groups on the Crosslinking and Surface Properties of PEG Hydrogel Films. Polymers (Basel) 2021; 13:polym13193296. [PMID: 34641112 PMCID: PMC8512835 DOI: 10.3390/polym13193296] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 09/23/2021] [Accepted: 09/23/2021] [Indexed: 01/27/2023] Open
Abstract
Silica nanoparticles (G-SiNPs) blocked with 3-glycidoxypropyl trimethoxysilane (GPTS) were newly applied to hydrogel films for improving film coating properties and to distribute the epoxy groups on the film surface. The effects of the content of epoxy-functionalized G-SiNPs on the crosslinking features by photo-induced radical polymerization and the surface mechanical properties of the hydrogel films containing poly(ethylene glycol) dimethacrylate (PEGDMA) and glycidyl methacrylate (GMA) were investigated. The real-time elastic modulus of various PEG hydrogel mixtures with prepared particles was monitored using a rotational rheometer. The distribution of epoxy groups on the crosslinked film surface was directly and indirectly estimated by the elemental analysis of Si and Br. The surface mechanical properties of various hydrogel films were measured by nano-indentation and nano-scratch tests. The relationship between the rheological and surface properties of PEG-based hydrogel films suggests that the use of small amounts of G-SiNPs enhances the surface hardness and crosslinked network of the film and uniformly distributes sufficient epoxy groups on the film surface for further coating applications.
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Affiliation(s)
- Junyoung Park
- Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea; (J.P.); (N.K.); (K.I.J.); (S.Y.)
| | - Nahee Kim
- Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea; (J.P.); (N.K.); (K.I.J.); (S.Y.)
| | - Kevin Injoe Jung
- Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea; (J.P.); (N.K.); (K.I.J.); (S.Y.)
| | - Soomin Yoon
- Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea; (J.P.); (N.K.); (K.I.J.); (S.Y.)
| | - Seung Man Noh
- Research Center for Green Fine Chemicals, Korea Research Institute of Chemical Technology, Ulsan 44412, Korea;
| | - Joona Bang
- Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea; (J.P.); (N.K.); (K.I.J.); (S.Y.)
- Correspondence: (J.B.); (H.W.J.); Tel.: +82-2-3290-3309 (J.B.); +82-2-3290-3306 (H.W.J.)
| | - Hyun Wook Jung
- Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea; (J.P.); (N.K.); (K.I.J.); (S.Y.)
- Correspondence: (J.B.); (H.W.J.); Tel.: +82-2-3290-3309 (J.B.); +82-2-3290-3306 (H.W.J.)
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5
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Kim JS, Choi J, Ki CS, Lee KH. 3D Silk Fiber Construct Embedded Dual-Layer PEG Hydrogel for Articular Cartilage Repair - In vitro Assessment. Front Bioeng Biotechnol 2021; 9:653509. [PMID: 33842448 PMCID: PMC8024629 DOI: 10.3389/fbioe.2021.653509] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Accepted: 03/03/2021] [Indexed: 01/22/2023] Open
Abstract
Since articular cartilage does not regenerate itself, researches are underway to heal damaged articular cartilage by applying biomaterials such as a hydrogel. In this study, we have constructed a dual-layer composite hydrogel mimicking the layered structure of articular cartilage. The top layer consists of a high-density PEG hydrogel prepared with 8-arm PEG and PEG diacrylate using thiol-norbornene photo-click chemistry. The compressive modulus of the top layer was 700.1 kPa. The bottom layer consists of a low-density PEG hydrogel reinforced with a 3D silk fiber construct. The low-density PEG hydrogel was prepared with 4-arm PEG using the same cross-linking chemistry, and the compressive modulus was 13.2 kPa. Silk fiber was chosen based on the strong interfacial bonding with the low-density PEG hydrogel. The 3D silk fiber construct was fabricated by moving the silk fiber around the piles using a pile frame, and the compressive modulus of the 3D silk fiber construct was 567 kPa. The two layers were joined through a covalent bond which endowed sufficient stability against repeated torsions. The final 3D silk fiber construct embedded dual-layer PEG hydrogel had a compressive modulus of 744 kPa. Chondrogenic markers confirmed the chondrogenic differentiation of human mesenchymal stem cells encapsulated in the bottom layer.
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Affiliation(s)
- Jung Soo Kim
- Department of Agriculture, Forestry and Bioresources, Seoul National University, Seoul, South Korea
| | - Jaeho Choi
- Department of Agriculture, Forestry and Bioresources, Seoul National University, Seoul, South Korea
| | - Chang Seok Ki
- Department of Agriculture, Forestry and Bioresources, Seoul National University, Seoul, South Korea.,Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, South Korea
| | - Ki Hoon Lee
- Department of Agriculture, Forestry and Bioresources, Seoul National University, Seoul, South Korea.,Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, South Korea
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6
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Liu S, Jiang T, Guo R, Li C, Lu C, Yang G, Nie J, Wang F, Yang X, Chen Z. Injectable and Degradable PEG Hydrogel with Antibacterial Performance for Promoting Wound Healing. ACS Appl Bio Mater 2021; 4:2769-2780. [PMID: 35014316 DOI: 10.1021/acsabm.1c00004] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Injectable and degradable PEG hydrogel was prepared via Michael-type addition between cross-linking monomer 4-arm-PEG-MAL and two cross-linkers of hydrolysis degradable PEG-diester-dithiol and non-degradable PEG-dithiol, and it had a porous structure with the uniform pore size. The biocompatibility assays in vitro indicated that PEG hydrogel had excellent biocompatibility and can be degraded naturally without leading to any negative impact on cells. The results of antibacterial experiments showed that PEG hydrogel can inhibit the growth of bacteria. Furthermore, the Cell Counting Kit-8 (CCK-8) assay, LIVE/DEAD cell staining, and scratch healing experiments proved that PEG hydrogel can promote cell proliferation and migration, which had been further confirmed in in vivo experiments on the rat wound models. All experimental results demonstrated that PEG hydrogel is an injectable antibacterial dressing, which can promote the process of wound healing and has great potential in the field of wound healing.
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Affiliation(s)
- Siju Liu
- Hubei Collaborative Innovation Center for Advanced Organochemical Materials and Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan 430062, China
| | - Tao Jiang
- Department of Hand Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Renqi Guo
- Hubei Collaborative Innovation Center for Advanced Organochemical Materials and Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan 430062, China
| | - Chuang Li
- Hubei Collaborative Innovation Center for Advanced Organochemical Materials and Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan 430062, China
| | - Cuifen Lu
- Hubei Collaborative Innovation Center for Advanced Organochemical Materials and Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan 430062, China
| | - Guichun Yang
- Hubei Collaborative Innovation Center for Advanced Organochemical Materials and Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan 430062, China
| | - Junqi Nie
- Hubei Collaborative Innovation Center for Advanced Organochemical Materials and Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan 430062, China
| | - Feiyi Wang
- Hubei Collaborative Innovation Center for Advanced Organochemical Materials and Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan 430062, China
| | - Xiaofan Yang
- Department of Hand Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Zhenbing Chen
- Department of Hand Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
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7
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Maynard S, Gelmi A, Skaalure SC, Pence IJ, Lee-Reeves C, Sero JE, Whittaker TE, Stevens MM. Nanoscale Molecular Quantification of Stem Cell-Hydrogel Interactions. ACS Nano 2020; 14:17321-17332. [PMID: 33215498 PMCID: PMC7760213 DOI: 10.1021/acsnano.0c07428] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 11/17/2020] [Indexed: 05/07/2023]
Abstract
A common approach to tailoring synthetic hydrogels for regenerative medicine applications involves incorporating RGD cell adhesion peptides, yet assessing the cellular response to engineered microenvironments at the nanoscale remains challenging. To date, no study has demonstrated how RGD concentration in hydrogels affects the presentation of individual cell surface receptors. Here we studied the interaction between human mesenchymal stem cells (hMSCs) and RGD-functionalized poly(ethylene glycol) hydrogels, by correlating macro- and nanoscale single-cell interfacial quantification techniques. We quantified RGD unbinding forces on a synthetic hydrogel using single cell atomic force spectroscopy, revealing that short-term binding of hMSCs was sensitive to RGD concentration. We also performed direct stochastic optical reconstruction microscopy (dSTORM) to quantify the molecular interactions between integrin α5β1 and a biomaterial, unexpectedly revealing that increased integrin clustering at the hydrogel-cell interface correlated with fewer available RGD binding sites. Our complementary, quantitative approach uncovered mechanistic insights into specific stem cell-hydrogel interactions, where dSTORM provides nanoscale sensitivity to RGD-dependent differences in cell surface localization of integrin α5β1. Our findings reveal that it is possible to precisely determine how peptide-functionalized hydrogels interact with cells at the molecular scale, thus providing a basis to fine-tune the spatial presentation of bioactive ligands.
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Affiliation(s)
| | | | - Stacey C. Skaalure
- Department of Materials,
Department of Bioengineering and Institute of Biomedical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Isaac J. Pence
- Department of Materials,
Department of Bioengineering and Institute of Biomedical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Charlotte Lee-Reeves
- Department of Materials,
Department of Bioengineering and Institute of Biomedical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom
| | | | - Thomas E. Whittaker
- Department of Materials,
Department of Bioengineering and Institute of Biomedical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Molly M. Stevens
- Department of Materials,
Department of Bioengineering and Institute of Biomedical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom
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8
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Jeong DU, Bae S, Macks C, Whitaker J, Lynn M, Webb K, Lee JS. Hydrogel-mediated local delivery of dexamethasone reduces neuroinflammation after traumatic brain injury. Biomed Mater 2020; 16. [PMID: 33152711 DOI: 10.1088/1748-605x/abc7f1] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 11/05/2020] [Indexed: 02/08/2023]
Abstract
Excessive and prolonged neuroinflammation leads to neuronal cell death and limits functional recovery after traumatic brain injury (TBI). Dexamethasone (DX) is a steroidal anti-inflammatory agent that is known to attenuate early expression of pro-inflammatory cytokines associated with activated microglia/macrophages. In this study, we investigated the effect of dexamethasone-conjugated hyaluronic acid (HA-DXM) incorporated in a hydrolytically degradable, photo-cross-linkable PEG-bis-(acryloyloxy acetate) (PEG-bis-AA) hydrogel on the inflammatory response, apoptosis, and functional recovery in a controlled cortical impact (CCI) rat TBI model. In vitro, DX release from PEG-bis-AA/HA-DXM hydrogel was slow in PBS without enzymes, but significantly increased in the presence of hyauronidase/esterase enzymes. TBI was generated by a CCI device armed with a 3 mm tip (3.5 m/sec, depth: 2 mm) and treated immediately with PEG-bis-AA/HA-DXM hydrogel. PEG-bis-AA/HA hydrogel without DX was used for comparison and untreated TBI group was used as a control. Significant reductions in cavity size, inflammatory response, and apoptosis were observed in animals treated with PEG-bis-AA/HA-DXM compared to those receiving PEG-bis-AA/HA and untreated. Animals receiving the PEG-bis-AA/HA-DXM hydrogel also exhibited higher neuronal cell survival and improved motor functional recovery compared to the other two groups.
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Affiliation(s)
- Da Un Jeong
- Bioengineering, Clemson University, Clemson, South Carolina, UNITED STATES
| | - Sooneon Bae
- Bioengineering, Clemson University, Clemson, South Carolina, UNITED STATES
| | - Christian Macks
- Bioengineering, Clemson University, 301 Rhodes Research Center, Clemson, South Carolina, 29634-0002, UNITED STATES
| | | | - Michael Lynn
- Neurosurgery, Prisma Health, Greenville, South Carolina, UNITED STATES
| | - Ken Webb
- Bioengineering, Clemson University, Clemson, South Carolina, UNITED STATES
| | - Jeoung Soo Lee
- Bioengineering, Clemson University, 301 Rhodes Hall, Clemson, South Carolina, 29634-0002, UNITED STATES
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9
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Sung J, Lee DG, Lee S, Park J, Jung HW. Crosslinking Dynamics and Gelation Characteristics of Photo- and Thermally Polymerized Poly(Ethylene Glycol) Hydrogels. Materials (Basel) 2020; 13:E3277. [PMID: 32717929 PMCID: PMC7435459 DOI: 10.3390/ma13153277] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 07/16/2020] [Accepted: 07/20/2020] [Indexed: 12/15/2022]
Abstract
The crosslinking behaviors and gelation features of poly(ethylene glycol) (PEG) hydrogels were scrutinized during the UV and thermal polymerizations of mixtures of poly(ethylene glycol) methacrylate (PEGMA, monomer) and poly(ethylene glycol) dimethacrylates (PEGDMAs, crosslinkers). The real-time crosslinking behavior of the PEG hydrogels was quantified as a function of the UV irradiation time and reaction temperature during the UV and thermal polymerization, respectively, using real-time FT-IR spectrometry and rotational rheometry. The gelation characteristics of UV- and thermally crosslinked hydrogels were compared through the analysis of the gel fraction, swelling ratio, surface hardness, and the loading and release of rhodamine-B. The gelation properties of the cured hydrogel films were suitably correlated with the real-time rheological properties and crosslinked network state of the PEG mixtures. The crosslinking and gelation properties of the cured hydrogels could be optimally tuned by not only the molecular weight of the crosslinker but also the UV or thermal polymerization conditions.
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Affiliation(s)
- Jungmoon Sung
- Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea; (J.S.); (D.G.L.); (J.P.)
- Analysis Platform, R&D Center, SK Innovation, Daejeon 34124, Korea;
| | - Dong Geun Lee
- Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea; (J.S.); (D.G.L.); (J.P.)
| | - Sukchin Lee
- Analysis Platform, R&D Center, SK Innovation, Daejeon 34124, Korea;
| | - Junyoung Park
- Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea; (J.S.); (D.G.L.); (J.P.)
| | - Hyun Wook Jung
- Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea; (J.S.); (D.G.L.); (J.P.)
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10
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Abstract
A critical hurdle associated with natural killer (NK) cell immunotherapies is inadequate infiltration and function in the solid tumor microenvironment. Well-controlled 3D culture systems could advance our understanding of the role of various biophysical and biochemical cues that impact NK cell migration in solid tumors. The objectives of this study were to establish a biomaterial which (i) supports NK cell migration and (ii) recapitulates features of the in vivo solid tumor microenvironment, to study NK infiltration and function in a 3D system. Using peptide-functionalized poly(ethylene glycol)-based hydrogels, the extent of NK-92 cell migration was observed to be largely dependent on the density of integrin binding sites and the presence of matrix metalloproteinase degradable sites. When lung cancer cells were encapsulated into the hydrogels to create tumor microenvironments, the extent of NK-92 cell migration and functional activity was dependent on the cancer cell type and duration of 3D culture. NK-92 cells showed greater migration into the models consisting of nonmetastatic A549 cells relative to metastatic H1299 cells, and reduced migration in both models when cancer cells were cultured for 7 days versus 1 day. In addition, the production of NK cell-related pro-inflammatory cytokines and chemokines was reduced in H1299 models relative to A549 models. These differences in NK-92 cell migration and cytokine/chemokine production corresponded to differences in the production of various immunomodulatory molecules by the different cancer cells, namely, the H1299 models showed increased stress ligand shedding and immunosuppressive cytokine production, particularly TGF-β. Indeed, inhibition of TGF-β receptor I in NK-92 cells restored their infiltration in H1299 models to levels similar to that in A549 models and increased overall infiltration in both models. Relative to conventional 2D cocultures, NK-92 cell mediated cytotoxicity was reduced in the 3D tumor models, suggesting the hydrogel serves to mimic some features of the biophysical barriers in in vivo tumor microenvironments. This study demonstrates the feasibility of a synthetic hydrogel system for investigating the biophysical and biochemical cues impacting NK cell infiltration and NK cell-cancer cell interactions in the solid tumor microenvironment.
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Affiliation(s)
- Madison N Temples
- J. Crayton Pruitt Department of Biomedical Engineering, University of Florida, Biomedical Sciences Building JG-56, 1275 Center Drive, Gainesville, Florida 32611-6131, United States
| | - Isaac M Adjei
- J. Crayton Pruitt Department of Biomedical Engineering, University of Florida, Biomedical Sciences Building JG-56, 1275 Center Drive, Gainesville, Florida 32611-6131, United States
| | - Phoebe M Nimocks
- J. Crayton Pruitt Department of Biomedical Engineering, University of Florida, Biomedical Sciences Building JG-56, 1275 Center Drive, Gainesville, Florida 32611-6131, United States
| | - Julie Djeu
- Department of Immunology, Moffitt Cancer Center MRC 4E, 12902 Magnolia Drive, Tampa, Florida 33612-9497, United States
| | - Blanka Sharma
- J. Crayton Pruitt Department of Biomedical Engineering, University of Florida, Biomedical Sciences Building JG-56, 1275 Center Drive, Gainesville, Florida 32611-6131, United States
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11
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Amer LD, Saleh LS, Walker C, Thomas S, Janssen WJ, Alper S, Bryant SJ. Inflammation via myeloid differentiation primary response gene 88 signaling mediates the fibrotic response to implantable synthetic poly(ethylene glycol) hydrogels. Acta Biomater 2019; 100:105-117. [PMID: 31568879 DOI: 10.1016/j.actbio.2019.09.043] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 09/20/2019] [Accepted: 09/26/2019] [Indexed: 12/19/2022]
Abstract
Synthetic hydrogels, such as poly(ethylene glycol) (PEG), are promising for a range of in vivo applications. However, like all non-biological biomaterials, synthetic hydrogels including PEG elicit a foreign body response (FBR). The FBR is thought to be initiated by adsorbed protein that is recognized by and subsequently activates inflammatory cells, notably macrophages, and culminates with fibrotic encapsulation. However, the molecular mechanisms that drive the FBR are not well understood. Toll-like receptors (TLRs) are key receptors that recognize pathogens, but also recognize altered host proteins that display damage-associated molecular patterns (DAMPs). Thus TLRs may play a role in the FBR. Here, we investigated myeloid differentiation primary response gene 88 (MyD88), a signaling adaptor protein that mediates inflammatory cytokine production induced by most TLRs. An in vitro model was used consisting of macrophages cultured on the surface of synthetic hydrogels, specifically PEG, with pre-adsorbed serum proteins. Our in vitro findings demonstrate that MyD88-dependent signaling is the predominant inflammatory pathway in macrophage activation to synthetic hydrogels. When stimulated with TLR agonists to mimic additional DAMPs present in vivo, MyD88-dependent signaling was also the predominant pathway in macrophage activation. An in vivo model of PEG hydrogels implanted subcutaneously in wild-type and MyD88-/- mice also demonstrated that MyD88 is the key contributor to the recruitment of inflammatory cells and formation of the fibrous capsule surrounding the implanted hydrogel. Taken together, findings from this study identify MyD88-mediated inflammation as being a critical pathway involved not only in the inflammatory response, but in formation of the fibrous capsule to PEG hydrogels. STATEMENT OF SIGNIFICANCE: Synthetic hydrogels are promising for in vivo applications but, like all non-biological biomaterials, synthetic hydrogels elicit a foreign body response (FBR). The molecular mechanisms that drive the FBR are not well understood. This work identifies the myeloid differentiation primary response gene 88 (MyD88) as a central mediator to macrophage activation in response to a poly(ethylene glycol) hydrogel with pre-adsorbed proteins in vitro. Moreover, MyD88 was also central to the recruitment of inflammatory cells, which included neutrophils, monocytes, and macrophages, to implanted PEG hydrogels and to fibrous encapsulation. These findings demonstrate that MyD88-mediated inflammation is responsible in part for the formation of the fibrous capsule of the FBR.
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Affiliation(s)
- Luke D Amer
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO 80309, United States; BioFrontiers Institute, University of Colorado, Boulder, CO 80309, United States
| | - Leila S Saleh
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO 80309, United States
| | - Cierra Walker
- BioFrontiers Institute, University of Colorado, Boulder, CO 80309, United States; Material Science and Engineering Program, University of Colorado, Boulder, CO 80309, United States
| | - Stacey Thomas
- Division of Pulmonary, Sleep and Critical Care Medicine, National Jewish Health, Denver, CO 80206, United States
| | - William J Janssen
- Division of Pulmonary, Sleep and Critical Care Medicine, National Jewish Health, Denver, CO 80206, United States; Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado Denver, Aurora, CO 80045, United States
| | - Scott Alper
- Department of Biomedical Research and Center for Genes, Environment and Health, National Jewish Health, Denver, CO 80206, United States; Department of Immunology and Microbiology, University of Colorado School of Medicine, Aurora, CO 80045, United States
| | - Stephanie J Bryant
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO 80309, United States; BioFrontiers Institute, University of Colorado, Boulder, CO 80309, United States; Material Science and Engineering Program, University of Colorado, Boulder, CO 80309, United States.
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12
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Dai J, Qiao W, Shi J, Liu C, Hu X, Dong N. Modifying decellularized aortic valve scaffolds with stromal cell-derived factor-1α loaded proteolytically degradable hydrogel for recellularization and remodeling. Acta Biomater 2019; 88:280-292. [PMID: 30721783 DOI: 10.1016/j.actbio.2019.02.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Revised: 01/31/2019] [Accepted: 02/01/2019] [Indexed: 02/06/2023]
Abstract
Decellularized matrix is of great interest as a scaffold for the tissue engineering heart valves due to its naturally three-dimensional structure and bioactive composition. A primary challenge of tissue engineered heart valves based on decellularized matrix is to grow a physiologically appropriate cell population within the leaflet tissue. In this study, a composite scaffold was fabricated by the combination of a porous matrix metalloproteinase (MMP) degradable poly (ethylene glycol) (PEG) hydrogel that were loaded with stromal cell-derived factor-1α (SDF-1α) and a mechanically supportive decellularized porcine aortic valve. Results demonstrated that the modified scaffold enhanced bone marrow mesenchymal stem cells (BMSC) adhesion, viability and proliferation, and promoted BMSC differentiate into valve interstitial-like cells. Furthermore, these modifications lead to enhanced protection of the scaffold from thrombosis. In vivo assessment by rat subdermal model showed the modified scaffold was highly biocompatible with tissue remodeling characterized by promoting mesenchymal stem cells recruitment and facilitating M2 macrophage phenotype polarization. The surface layers of PEG hydrogel not only could provide a niche for cell migration, proliferation and differentiation, but also protect the scaffolds from rapid degeneration, inflammation and calcification. The intermediate layer of decellularized valve could maintain the organization of the scaffold and perform the valve function. The promising results emphasize the potential of our scaffolds to improve recellularization and promote remodeling of implanted decellularized valves. These findings suggest that the SDF-1α loaded MMP degradable PEG hydrogel modification could be an efficient approach to develop functional decellularized heart valve. STATEMENT OF SIGNIFICANCE: A composite scaffold was fabricated by the combination of a porous matrix metalloproteinase (MMP) degradable poly (ethylene glycol) (PEG) hydrogel that were loaded with SDF-1α and a mechanically supportive decellularized porcine aortic valve. The surface layers of PEG hydrogel not only could provide a niche for cell migration, proliferation and differentiation, but also protect the scaffolds from rapid degeneration, inflammation and calcification. The intermediate layer of decellularized valve could maintain the organization of the scaffold and perform the valve function. The promising results emphasize the ability of our scaffolds to improve recellularization and promote remodeling of implanted decellularized valves. This suggests that the extracellular matrix-based valve scaffolds have potential for clinical applications.
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Affiliation(s)
- Jinchi Dai
- Department of Cardiovascular Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Weihua Qiao
- Department of Cardiovascular Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Jiawei Shi
- Department of Cardiovascular Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Chungen Liu
- Department of Cardiovascular Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Xingjian Hu
- Department of Cardiovascular Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Nianguo Dong
- Department of Cardiovascular Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.
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Yesildag C, Ouyang Z, Zhang Z, Lensen MC. Micro-Patterning of PEG-Based Hydrogels With Gold Nanoparticles Using a Reactive Micro-Contact-Printing Approach. Front Chem 2019; 6:667. [PMID: 30705881 PMCID: PMC6344407 DOI: 10.3389/fchem.2018.00667] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 12/21/2018] [Indexed: 01/27/2023] Open
Abstract
In this work a novel, relatively simple, and fast method for patterning of gold nanoparticles (Au NPs) on poly(ethylene glycol) (PEG)-based hydrogels is presented. In the hereby exploited reactive micro-contact printing (reactive-μ-CP) process, the surface of a micro-relief patterned PDMS-stamp is first functionalized with an amino-silane self-assembled monolayer (SAM), which is then inked with Au NPs. The stamp is subsequently brought into conformal contact with thiol-functionalized PEG-based hydrogel films. Due to the strong gold-thiol interactions the Au NPs are adequately and easily transferred onto the surfaces of these soft, multifunctional PEG hydrogels. In this way, defined μ-patterns of Au NPs on PEG hydrogels are achieved. These Au NPs patterns allow specific biomolecular interactions on PEG surfaces, and cell adhesion has been studied. Cells were found to effectively adhere only on Au NPs micro-patterns and to avoid the anti-adhesive PEG background. Besides the cell adhesion studies, these Au NPs μ-patterns can be potentially applied as biosensors in plasmon-based spectroscopic devices or in medicine, e.g., for drug delivery systems or photothermal therapies.
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Affiliation(s)
| | | | - Zhenfang Zhang
- Nanopatterned Biomaterials, Department of Chemistry, Technische Universität Berlin, Berlin, Germany
| | - Marga C. Lensen
- Nanopatterned Biomaterials, Department of Chemistry, Technische Universität Berlin, Berlin, Germany
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Peng Y, Liu QJ, He T, Ye K, Yao X, Ding J. Degradation rate affords a dynamic cue to regulate stem cells beyond varied matrix stiffness. Biomaterials 2018; 178:467-480. [PMID: 29685517 DOI: 10.1016/j.biomaterials.2018.04.021] [Citation(s) in RCA: 96] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Revised: 03/31/2018] [Accepted: 04/11/2018] [Indexed: 12/15/2022]
Abstract
While various static cues such as matrix stiffness have been known to regulate stem cell differentiation, it is unclear whether or not dynamic cues such as degradation rate along with the change of material chemistry can influence cell behaviors beyond simple integration of static cues such as decreased matrix stiffness. The present research is aimed at examining effects of degradation rates on adhesion and differentiation of mesenchymal stem cells (MSCs) in vitro on well-defined synthetic hydrogel surfaces. Therefore, we synthesized macromers by extending both ends of poly(ethylene glycol) (PEG) with oligo(lactic acid) and then acryloyl, and the corresponding hydrogels that were obtained after photopolymerization of the macromers were biodegradable. Combining the unique techniques of block copolymer micelle nanolithography with transfer lithography, we prepared a nanoarray of cell-adhesive arginine-glycine-aspartate peptides on this nonfouling biodegradable hydrogel. The biodegradation is caused by hydrolysis of the ester bonds, and different degradation rates in the cell culture medium were achieved by different stages of accelerated pre-hydrolysis in an acidic medium. For the following cell culture and induction, both the matrix stiffness and degradation rate varied among the examined groups. While adipogenic differentiation of MSCs can be understood by the lowered stiffness, the osteogenic differentiation was contradictory with common sense because we found enhanced osteogenesis on soft hydrogels. Higher degradation rates were suggested to account for this interesting phenomenon in the sole osteogenic/adipogenic induction and even more complicated trends in the co-induction. Hence, the degradation rate is a dynamic cue influencing cell behaviors, which should be paid attention to for degradable biomaterials.
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Affiliation(s)
- Yuanmeng Peng
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China
| | - Qiong-Jie Liu
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China
| | - Tianlei He
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China
| | - Kai Ye
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China
| | - Xiang Yao
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China
| | - Jiandong Ding
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China.
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15
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Ishihara K, Ranga A, Lutolf MP, Tanaka EM, Meinhardt A. Reconstitution of a Patterned Neural Tube from Single Mouse Embryonic Stem Cells. Methods Mol Biol. 2017;1597:43-55. [PMID: 28361309 DOI: 10.1007/978-1-4939-6949-4_4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
The recapitulation of tissue development and patterning in three-dimensional (3D) culture is an important dimension of stem cell research. Here, we describe a 3D culture protocol in which single mouse ES cells embedded in Matrigel under neural induction conditions clonally form a lumen containing, oval-shaped epithelial structure within 3 days. By Day 7 an apicobasally polarized neuroepithelium with uniformly dorsal cell identity forms. Treatment with retinoic acid at Day 2 results in posteriorization and self-organization of dorsal-ventral neural tube patterning. Neural tube organoid growth is also supported by pure laminin gels as well as poly(ethylene glycol) (PEG)-based artificial extracellular matrix hydrogels, which can be fine-tuned for key microenvironment characteristics. The rapid generation of a simple, patterned tissue in well-defined culture conditions makes the neural tube organoid a tractable model for studying neural stem cell self-organization.
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16
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Zhang M, Song CC, Du FS, Li ZC. Supersensitive Oxidation-Responsive Biodegradable PEG Hydrogels for Glucose-Triggered Insulin Delivery. ACS Appl Mater Interfaces 2017; 9:25905-25914. [PMID: 28714308 DOI: 10.1021/acsami.7b08372] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Reactive oxygen species (ROS)-responsive polymers and hydrogels represent an emerging family of intelligent materials owing to the key functions of ROS in physiological processes or pathological diseases. Nonetheless, the weaknesses such as low sensitivity, slow response, instability, and low mechanical strength are associated with the limited ROS-responsive polymeric or supramolecular hydrogels. In this study, a novel type of oxidation-responsive degradable hydrogels was fabricated by the redox-initiated radical polymerization of a 4-arm-poly(ethylene glycol) (PEG) acrylic macromonomer that possesses a H2O2-cleavable phenylboronic acid linker in each of the arms. The macroscopic hydrogels have the features of good cytocompatibility, moderate mechanical strength, and fast response toward H2O2 of low concentration, owing to the covalently cross-linked hydrophilic PEG network and high sensitivity of the linker. They could encapsulate biomacromolecules, such as insulin and glucose oxidase (GOx), with high efficacy, affording a new glucose-responsive insulin-delivery platform on the basis of enzymatic transformation of a biochemical signal (glucose) into an oxidative stimulus (H2O2). Interestingly, in vitro results demonstrate that the same GOx-loaded hydrogel exhibited disparate degradation modes under different triggering molecules, that is, bulk degradation by H2O2 and surface erosion by glucose. Moreover, compared to the macroscopic hydrogel, the nanogel with a diameter of ∼160 nm prepared by inverse emulsion polymerization showed a much higher degradation rate even under triggering of 20 μM H2O2, a pathologically available concentration in vivo.
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Affiliation(s)
- Mei Zhang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China
| | - Cheng-Cheng Song
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China
| | - Fu-Sheng Du
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China
| | - Zi-Chen Li
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China
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17
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Ye K, Cao L, Li S, Yu L, Ding J. Interplay of Matrix Stiffness and Cell-Cell Contact in Regulating Differentiation of Stem Cells. ACS Appl Mater Interfaces 2016; 8:21903-13. [PMID: 26600563 DOI: 10.1021/acsami.5b09746] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Stem cells are capable of sensing and responding to the mechanical properties of extracellular matrixes (ECMs). It is well-known that, while osteogenesis is promoted on the stiff matrixes, adipogenesis is enhanced on the soft ones. Herein, we report an "abnormal" tendency of matrix-stiffness-directed stem cell differentiation. Well-defined nanoarrays of cell-adhesive arginine-glycine-aspartate (RGD) peptides were modified onto the surfaces of persistently nonfouling poly(ethylene glycol) (PEG) hydrogels to achieve controlled specific cell adhesion and simultaneously eliminate nonspecific protein adsorption. Mesenchymal stem cells were cultivated on the RGD-nanopatterned PEG hydrogels with the same RGD nanospacing but different hydrogel stiffnesses and incubated in the induction medium to examine the effect of matrix stiffness on osteogenic and adipogenic differentiation extents. When stem cells were kept at a low density during the induction period, the differentiation tendency was consistent with the previous reports in the literature; however, both lineage commitments were favored on the stiff matrices at a high cell density. We interpreted such a complicated stiffness effect at a high cell density in two-dimensional culture as the interplay of matrix stiffness and cell-cell contact. As a result, this study strengthens the essence of the stiffness effect and highlights the combinatory effects of ECM cues and cell cues on stem cell differentiation.
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Affiliation(s)
- Kai Ye
- State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Polymers and Polymer Composite Materials, Department of Macromolecular Science, Advanced Materials Laboratory, Fudan University , Shanghai 200433, China
| | - Luping Cao
- State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Polymers and Polymer Composite Materials, Department of Macromolecular Science, Advanced Materials Laboratory, Fudan University , Shanghai 200433, China
| | - Shiyu Li
- State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Polymers and Polymer Composite Materials, Department of Macromolecular Science, Advanced Materials Laboratory, Fudan University , Shanghai 200433, China
| | - Lin Yu
- State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Polymers and Polymer Composite Materials, Department of Macromolecular Science, Advanced Materials Laboratory, Fudan University , Shanghai 200433, China
| | - Jiandong Ding
- State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Polymers and Polymer Composite Materials, Department of Macromolecular Science, Advanced Materials Laboratory, Fudan University , Shanghai 200433, China
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18
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Metzger S, Blache U, Lienemann PS, Karlsson M, Weber FE, Weber W, Ehrbar M. Cell-Mediated Proteolytic Release of Growth Factors from Poly(Ethylene Glycol) Matrices. Macromol Biosci 2016; 16:1703-1713. [PMID: 27548907 DOI: 10.1002/mabi.201600223] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 07/22/2016] [Indexed: 11/10/2022]
Abstract
Engineering in vitro tissue mimetics that resemble the corresponding living tissues requires the 3D arrangement of tissue progenitor cells and their differentiation by localized growth factor (GF) signaling cues. Recent technological advances open a large field of possibilities for the creation of complex GF arrangements. Additionally, cell-instructive biomaterials, which bind GFs by various mechanisms and release them with different kinetics depending on binding affinity, have become available. This paper describes the development of a matrix metalloproteinase (MMP)-degradable streptavidin-based linker module, which allows the release of immobilized GFs from synthetic biomimetic poly(ethylene glycol) hydrogels independently of the hydrogel degradation. The MMP-sensitive streptavidin linker is shown to efficiently bind biotinylated molecules, and as proof of concept, bone morphogenetic protein-2 (BMP-2) delivery via the MMP-degradable linker is used to induce osteogenic differentiation in C2C12 cells and mesenchymal stem cells. The results show a significantly increased net effect of proteolytically releasable BMP-2 in comparison to stably immobilized and soluble BMP-2. This study indicates that a GF delivery system directly responsive to cellular activity can have important implications for the synthesis of tissue mimetics and regenerative medicine, as it can influence the availability, the localization of effects, as well as efficacy of employed GFs.
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Affiliation(s)
- Stéphanie Metzger
- Department of Obstetrics, University and University Hospital Zurich, Schmelzbergstrasse 12, 8091, Zurich, Switzerland
| | - Ulrich Blache
- Department of Obstetrics, University and University Hospital Zurich, Schmelzbergstrasse 12, 8091, Zurich, Switzerland
| | - Philipp S Lienemann
- Department of Obstetrics, University and University Hospital Zurich, Schmelzbergstrasse 12, 8091, Zurich, Switzerland.,School of Engineering and Applied Sciences, Harvard University, 58 Oxford St., Cambridge, MA, 02138, USA
| | - Maria Karlsson
- Faculty of Biology and BIOSS Centre for Biological Signalling Studies, University of Freiburg, Schänzlestrasse 18, 79104, Freiburg, Germany
| | - Franz E Weber
- Department of Cranio Maxillofacial Surgery, Oral Biotechnology and Bioengineering, University and University Hospital Zurich, Schmelzbergstrasse 12, 8091, Zurich, Switzerland
| | - Wilfried Weber
- Faculty of Biology and BIOSS Centre for Biological Signalling Studies, University of Freiburg, Schänzlestrasse 18, 79104, Freiburg, Germany
| | - Martin Ehrbar
- Department of Obstetrics, University and University Hospital Zurich, Schmelzbergstrasse 12, 8091, Zurich, Switzerland
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Kim J, Perez AS, Claflin J, David A, Zhou H, Shikanov A. Synthetic hydrogel supports the function and regeneration of artificial ovarian tissue in mice. NPJ Regen Med 2016; 1:16010. [PMID: 28856012 DOI: 10.1038/npjregenmed.2016.10] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Many prepubertal girls and young women suffer from premature ovarian insufficiency induced by chemotherapy given for treatment of cancer and autoimmune diseases. Autotransplantation of cryopreserved ovarian tissue could restore the lost ovarian endocrine function and fertility. Unfortunately, tissue ischemia, inconsistent graft quality and the risk of reintroducing malignant cells may stand in the way of the clinical translation of this approach. To address these risks and limitations, we engineered an artificial ovarian tissue from immature follicles using a synthetic hydrogel, poly(ethylene glycol) vinyl sulfone (PEG-VS), as a supportive matrix. Enzymatically isolated follicles from 6–7-day-old mice ovaries were encapsulated in 7% PEG-VS hydrogels modified with 0.5 mmol/l RGD and crosslinked with a trifunctional matrix metalloproteinase-sensitive peptide. PEG hydrogels with the encapsulated follicles were orthotopically implanted into ovariectomised mice to investigate whether PEG hydrogel supports folliculogenesis and steroidogenesis in vivo. After 30 days, grafts revealed multiple fully developed antral follicles and corpora lutea, which corresponded with regular ovulation cycles and follicle-stimulating hormone (FSH) levels. The elevated levels of FSH, caused by bilateral ovariectomy, were reversed by the implanted follicles and maintained at physiological levels for 60 days. Importantly, primordial and primary follicles still represented 60% of the follicular pool, demonstrating selective recruitment of primordial follicles into the growing pool. Functioning blood vessels in the grafts 30 and 60 days after implantation proved the capability of PEG hydrogels to undergo graft remodelling and revascularisation. Our results demonstrate that PEG hydrogels with encapsulated immature ovarian follicles successfully functioned as an artificial ovarian tissue for 60 days in vivo.
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Zhao X, Papadopoulos A, Ibusuki S, Bichara DA, Saris DB, Malda J, Anseth KS, Gill TJ, Randolph MA. Articular cartilage generation applying PEG-LA-DM/PEGDM copolymer hydrogels. BMC Musculoskelet Disord 2016; 17:245. [PMID: 27255078 PMCID: PMC4891826 DOI: 10.1186/s12891-016-1100-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 05/26/2016] [Indexed: 12/04/2022] Open
Abstract
Background Injuries to the human native cartilage tissue are particularly problematic because cartilage has little to no ability to heal or regenerate itself. Employing a tissue engineering strategy that combines suitable cell sources and biomimetic hydrogels could be a promising alternative to achieve cartilage regeneration. However, the weak mechanical properties may be the major drawback to use fully degradable hydrogels. Besides, most of the fully degradable hydrogels degrade too fast to permit enough extracellular matrix (ECM) production for neocartilage formation. In this study, we demonstrated the feasibility of neocartilage regeneration using swine articular chondrocytes photoencapsualted into poly (ethylene glycol) dimethacrylate (PEGDM) copolymer hydrogels composed of different degradation profiles: degradable (PEG-LA-DM) and nondegradable (PEGDM) macromers in molar ratios of 50/50, 60/40, 70/30, 80/20, and 90/10. Methods Articular chondrocytes were isolated enzymatically from juvenile Yorkshire swine cartilage. 6 × 107 cells cells were added to each milliliter of macromer/photoinitiator (I2959) solution. Nonpolymerized gel containing the cells (100 μL) was placed in cylindrical molds (4.5 mm diameter × 6.5 mm in height). The macromer/photoinitiator/chondrocyte solutions were polymerized using ultraviolet (365 nm) light at 10 mW/cm2 for 10 mins. Also, an articular cartilaginous ring model was used to examine the capacity of the engineered cartilage to integrate with native cartilage. Samples in the pilot study were collected at 6 weeks. Samples in the long-term experimental groups (60/40 and 70/30) were implanted into nude mice subcutaneously and harvested at 6, 12 and 18 weeks. Additionally, cylindrical constructs that were not implanted used as time zero controls. All of the harvested specimens were examined grossly and analyzed histologically and biochemically. Results Histologically, the neocartilage formed in the photochemically crosslinked gels resembled native articular cartilage with chondrocytes in lacunae and surrounded by new ECM. Increases in total DNA, glycosaminoglycan, and hydroxyproline were observed over the time periods studied. The neocartilage integrated with existing native cartilage. Conclusions Articular cartilage generation was achieved using swine articular chondrocytes photoencapsulated in copolymer PEGDM hydrogels, and the neocartilage tissue had the ability to integrate with existing adjacent native cartilage.
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Affiliation(s)
- Xing Zhao
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.,Division of Plastic Surgery, Massachusetts General Hospital, Harvard Medical School, WACC 435, 15 Parkman Street, Boston, MA, 02114, USA.,Department of Orthopaedics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Anestis Papadopoulos
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Shinichi Ibusuki
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - David A Bichara
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.,Division of Plastic Surgery, Massachusetts General Hospital, Harvard Medical School, WACC 435, 15 Parkman Street, Boston, MA, 02114, USA
| | - Daniel B Saris
- Department of Orthopaedics, University Medical Center Utrecht, Utrecht, The Netherlands.,MIRA Institute for Biotechnology and Technical Medicine, University Twente, Enschede, The Netherlands
| | - Jos Malda
- Department of Orthopaedics, University Medical Center Utrecht, Utrecht, The Netherlands.,Department of Equine Science, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
| | - Kristi S Anseth
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO, USA
| | - Thomas J Gill
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Mark A Randolph
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA. .,Division of Plastic Surgery, Massachusetts General Hospital, Harvard Medical School, WACC 435, 15 Parkman Street, Boston, MA, 02114, USA.
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Liang Y, Coffin MV, Manceva SD, Chichester JA, Jones RM, Kiick KL. Controlled release of an anthrax toxin-neutralizing antibody from hydrolytically degradable polyethylene glycol hydrogels. J Biomed Mater Res A 2015. [PMID: 26223817 DOI: 10.1002/jbm.a.35545] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
In this study, hydrophilic and hydrolytically degradable poly (ethylene glycol) (PEG) hydrogels were formed via Michael-type addition and employed for sustained delivery of a monoclonal antibody against the protective antigen of anthrax. Taking advantage of the PEG-induced precipitation of the antibody, burst release from the matrix was avoided. These hydrogels were able to release active antibodies in a controlled manner from 14 days to as long as 56 days in vitro by varying the polymer architectures and molecular weights of the precursors. Analysis of the secondary and tertiary structure and the in vitro activity of the released antibody showed that the encapsulation and release did not affect the protein conformation or functionality. The results suggest the promise for developing PEG-based carriers for sustained release of therapeutic antibodies against toxins in various applications.
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Affiliation(s)
- Yingkai Liang
- Department of Materials Science and Engineering, University of Delaware, Newark, Delaware, 19716
| | - Megan V Coffin
- Fraunhofer USA, Center for Molecular Biotechnology, 9 Innovation Way, Newark, DE, 19711
| | - Slobodanka D Manceva
- Fraunhofer USA, Center for Molecular Biotechnology, 9 Innovation Way, Newark, DE, 19711
| | - Jessica A Chichester
- Fraunhofer USA, Center for Molecular Biotechnology, 9 Innovation Way, Newark, DE, 19711
| | - R Mark Jones
- Fraunhofer USA, Center for Molecular Biotechnology, 9 Innovation Way, Newark, DE, 19711
| | - Kristi L Kiick
- Department of Materials Science and Engineering, University of Delaware, Newark, Delaware, 19716.,Department of Biomedical Engineering, University of Delaware, Newark, DE, 19716
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22
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Gasparian A, Daneshian L, Ji H, Jabbari E, Shtutman M. Purification of high-quality RNA from synthetic polyethylene glycol-based hydrogels. Anal Biochem 2015; 484:1-3. [PMID: 25963891 DOI: 10.1016/j.ab.2015.05.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Revised: 04/30/2015] [Accepted: 05/01/2015] [Indexed: 11/25/2022]
Abstract
Polyethylene glycol (PEG)-based hydrogels, with variable stiffness, are widely used in tissue engineering to investigate substrate stiffness effects on cell properties. Transcriptome analysis is a critical method for understanding cell physiology. However, significant RNA degradation was observed during the process of isolating and purifying RNA from cells encapsulated in the PEG hydrogel, thereby precluding purification of high-quality RNA. Here, we describe a simple protocol that prevents RNA degradation and improves the quality and yield of RNA isolated from cells cultured in PEG hydrogels. This modification produces high-quality total RNA suitable for RNA sequencing and microarray analysis.
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Affiliation(s)
- Alexander Gasparian
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, SC 29208, USA
| | - Leily Daneshian
- Department of Chemical Engineering, College of Engineering and Computing, University of South Carolina, Columbia, SC 29208, USA
| | - Hao Ji
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, SC 29208, USA
| | - Esmaiel Jabbari
- Department of Chemical Engineering, College of Engineering and Computing, University of South Carolina, Columbia, SC 29208, USA.
| | - Michael Shtutman
- Department of Drug Discovery and Biomedical Sciences, South Carolina College of Pharmacy, University of South Carolina, Columbia, SC 29208, USA.
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23
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Abstract
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The
effects of mechanical cues on cell behaviors in 3D remain difficult
to characterize as the ability to tune hydrogel mechanics often requires
changes in the polymer density, potentially altering the material’s
biochemical and physical characteristics. Additionally, with most
PEG diacrylate (PEGDA) hydrogels, forming materials with compressive
moduli less than ∼10 kPa has been virtually impossible. Here,
we present a new method of controlling the mechanical properties of
PEGDA hydrogels independent of polymer chain density through the incorporation
of additional vinyl group moieties that interfere with the cross-linking
of the network. This modification can tune hydrogel mechanics in a
concentration dependent manner from <1 to 17 kPa, a more physiologically
relevant range than previously possible with PEG-based hydrogels,
without altering the hydrogel’s degradation and permeability.
Across this range of mechanical properties, endothelial cells (ECs)
encapsulated within MMP-2/MMP-9 degradable hydrogels with RGDS adhesive
peptides revealed increased cell spreading as hydrogel stiffness decreased
in contrast to behavior typically observed for cells on 2D surfaces.
EC-pericyte cocultures exhibited vessel-like networks within 3 days
in highly compliant hydrogels as compared to a week in stiffer hydrogels.
These vessel networks persisted for at least 4 weeks and deposited
laminin and collagen IV perivascularly. These results indicate that
EC morphogenesis can be regulated using mechanical cues in 3D. Furthermore,
controlling hydrogel compliance independent of density allows for
the attainment of highly compliant mechanical regimes in materials
that can act as customizable cell microenvironments.
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Affiliation(s)
- Ryan M Schweller
- Department of Biomedical Engineering, Duke University , Room 136 Hudson Hall, Durham, North Carolina 27708, United States
| | - Jennifer L West
- Department of Biomedical Engineering, Duke University , Room 136 Hudson Hall, Durham, North Carolina 27708, United States
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24
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Fan Y, Avci NG, Nguyen DT, Dragomir A, Akay YM, Xu F, Akay M. Engineering a High-Throughput 3-D In Vitro Glioblastoma Model. IEEE J Transl Eng Health Med 2015; 3:4300108. [PMID: 27170911 PMCID: PMC4848064 DOI: 10.1109/jtehm.2015.2410277] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Revised: 01/30/2015] [Accepted: 02/24/2015] [Indexed: 12/16/2022]
Abstract
Glioblastoma multiforme (GBM) is the most common and malignant primary brain tumor in adults because of its highly invasive behavior. The existing treatment for GBM, which involves a combination of resection, chemotherapy, and radiotherapy, has a very limited success rate with a median survival rate of <1 year. This is mainly because of the failure of early detection and effective treatment. We designed a novel 3-D GBM cell culture model based on microwells that could mimic in vitro environment and help to bypass the lack of suitable animal models for preclinical toxicity tests. Microwells were fabricated from simple and inexpensive polyethylene glycol material for the control of in vitro 3-D culture. We applied the 3-D micropatterning system to GBM (U-87) cells using the photolithography technique to control the cell spheroids' shape, size, and thickness. Our preliminary results suggested that uniform GBM spheroids can be formed in 3-D, and the size of these GBM spheroids depends on the size of microwells. The viability of the spheroids generated in this manner was quantitatively evaluated using live/dead assay and shown to improve over 21 days. We believe that in vitro 3-D cell culture model could help to reduce the time of the preclinical brain tumor growth studies. The proposed novel platform could be useful and cost-effective for high-throughput screening of cancer drugs and assessment of treatment responses.
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Affiliation(s)
- Yantao Fan
- Department of Biomedical EngineeringUniversity of HoustonHoustonTX77204USA
| | - Naze G. Avci
- Department of Biomedical EngineeringUniversity of HoustonHoustonTX77204USA
| | - Duong T. Nguyen
- Department of Biomedical EngineeringUniversity of HoustonHoustonTX77204USA
| | - Andrei Dragomir
- Department of Biomedical EngineeringUniversity of HoustonHoustonTX77204USA
| | - Yasemin M. Akay
- Department of Biomedical EngineeringUniversity of HoustonHoustonTX77204USA
| | - Feng Xu
- Bioinspired Engineering and Biomechanics CenterXi’an Jiaotong UniversityXi’an710049China
| | - Metin Akay
- Department of Biomedical EngineeringUniversity of HoustonHoustonTX77204USA
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25
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Bal T, Nazli C, Okcu A, Duruksu G, Karaöz E, Kizilel S. Mesenchymal stem cells and ligand incorporation in biomimetic poly(ethylene glycol) hydrogels significantly improve insulin secretion from pancreatic islets. J Tissue Eng Regen Med 2014; 11:694-703. [PMID: 25393526 DOI: 10.1002/term.1965] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Revised: 07/07/2014] [Accepted: 09/25/2014] [Indexed: 12/20/2022]
Abstract
The main goal of this study was to investigate pancreatic islet function with mesenchymal stem cells (MSCs) in a ligand-functionalized poly(ethylene glycol) (PEG) hydrogel for the treatment of type 1 diabetes (T1D). Rat bone marrow-derived MSCs (rBM-MSCs) were encapsulated within synthetic PEG hydrogel, and cell viability and apoptosis within this 3D environment was examined in detail. ATP content and caspase-3 activity of encapsulated MSCs showed that fibronectin-derived RGDS, laminin-derived IKVAV and/or insulinotropic glucagon-like peptide (GLP-1) were required to maintain MSC survival. Incorporation of these peptides into the hydrogel environment also improved pancreatic islet viability, where combinations of peptides had altered effects on islet survival. GLP-1 alone was the leading stimulator for insulin secretion. Cell adhesion peptides RGDS and IKVAV improved insulin secretion only when they were used in combination, but could not surpass the effect of GLP-1. Further, when pancreatic islets were co-encapsulated with MSCs within synthetic PEG hydrogel, a two-fold increase in the stimulation index was measured. Synergistic effects of MSCs and peptides were observed, with a seven-fold increase in the stimulation index. The results are promising and suggest that simultaneous incorporation of MSCs and ECM-derived peptides and/or GLP-1 can improve pancreatic islet function in response to altered glucose levels in the physiological environment. Copyright © 2014 John Wiley & Sons, Ltd.
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Affiliation(s)
- Tuğba Bal
- Chemical and Biological Engineering, Koc University, Istanbul, Turkey
| | - Caner Nazli
- Material Sciences and Engineering, Koc University, Istanbul, Turkey
| | - Alparslan Okcu
- Center for Stem Cell and Gene Therapies Research and Practice, Kocaeli University, Kocaeli, Turkey
| | - Gökhan Duruksu
- Center for Stem Cell and Gene Therapies Research and Practice, Kocaeli University, Kocaeli, Turkey
| | - Erdal Karaöz
- Center for Stem Cell and Gene Therapies Research and Practice, Kocaeli University, Kocaeli, Turkey.,Liv Hospital, Regenerative Medicine, Stem Cell Research and Therapy Center, Istanbul, Turkey
| | - Seda Kizilel
- Chemical and Biological Engineering, Koc University, Istanbul, Turkey.,Material Sciences and Engineering, Koc University, Istanbul, Turkey
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26
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Platzman I, Muth CA, Lee-Thedieck C, Pallarola D, Atanasova R, Louban I, Altrock E, Spatz JP. Surface Properties of Nanostructured Bio-Active Interfaces: Impacts of Surface Stiffness and Topography on Cell-Surface Interactions. RSC Adv 2013; 3:13293-13303. [PMID: 33791090 PMCID: PMC8009309 DOI: 10.1039/c3ra41579a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Due to their ability to confer key functions of the native extracellular matrix (ECM) poly(ethylene glycol) (PEG)-based and PEG-modified materials have been extensively used as biocompatible and biofunctionalized substrate systems to study the influence of environmental parameters on cell adhesion in vitro. Given wide-ranging recent evidence that ECM compliance influences a variety of cell functions, the detailed determination and characterization of the specific PEG surface characteristics including topography, stiffness and chemistry is required. Here, we studied two frequently used bio-active interfaces - PEG-based and PEG-modified surfaces - to elucidate the differences between the physical surface properties, which cells can sense and respond to. For this purpose, two sets of surfaces were synthesized: the first set consisted of nanopatterned glass surfaces containing cRGD-functionalized gold nanoparticles surrounded by a passivated PEG-silane layer and the second set consisted of PEG-diacrylate (PEG-DA) hydrogels decorated with cRGD-functionalized gold nanoparticlesAlthough the two sets of nanostructured materials compared here were highly similar in terms of density and geometrical distribution of the presented bio-ligands as well as in terms of mechanical bulk properties, the topography and mechanical properties of the surfaces were found to be substantially different and are described in detail. In comparison to very stiff and ultrasmooth surface properties of the PEG-passivated glasses, the mechanical properties of PEG-DA surfaces in the biologically relevant stiffness range, together with the increased surface roughness at micro- and nanoscale levels have the potential to affect cell behavior. This potential was verified by studying the adhesive behavior of hematopoietic KG-1a and rat embryonic fibroblast (REF52) cells on both surfaces.
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Affiliation(s)
- Ilia Platzman
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems Heisenbergstr. 3, Stuttgart 70569, Germany & Department of Biophysical Chemistry, University of Heidelberg, Heidelberg 69120, Germany
| | - Christine Anna Muth
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems Heisenbergstr. 3, Stuttgart 70569, Germany & Department of Biophysical Chemistry, University of Heidelberg, Heidelberg 69120, Germany
| | - Cornelia Lee-Thedieck
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems Heisenbergstr. 3, Stuttgart 70569, Germany & Department of Biophysical Chemistry, University of Heidelberg, Heidelberg 69120, Germany
- Karlsruhe Institute of Technology (KIT), Institute of Functional Interfaces, Hermann-von Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Diego Pallarola
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems Heisenbergstr. 3, Stuttgart 70569, Germany & Department of Biophysical Chemistry, University of Heidelberg, Heidelberg 69120, Germany
| | - Ralitsa Atanasova
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems Heisenbergstr. 3, Stuttgart 70569, Germany & Department of Biophysical Chemistry, University of Heidelberg, Heidelberg 69120, Germany
| | - Ilia Louban
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems Heisenbergstr. 3, Stuttgart 70569, Germany & Department of Biophysical Chemistry, University of Heidelberg, Heidelberg 69120, Germany
| | - Eva Altrock
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems Heisenbergstr. 3, Stuttgart 70569, Germany & Department of Biophysical Chemistry, University of Heidelberg, Heidelberg 69120, Germany
| | - Joachim P Spatz
- Department of New Materials and Biosystems, Max Planck Institute for Intelligent Systems Heisenbergstr. 3, Stuttgart 70569, Germany & Department of Biophysical Chemistry, University of Heidelberg, Heidelberg 69120, Germany
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27
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Wang X, Ye K, Li Z, Yan C, Ding J. Adhesion, proliferation, and differentiation of mesenchymal stem cells on RGD nanopatterns of varied nanospacings. Organogenesis 2013; 9:280-6. [PMID: 23959169 DOI: 10.4161/org.26080] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The present report is an extension of our preceding publication in Biomaterials (2013) entitled "Effect of RGD nanospacing on differentiation of stem cells." Cell-adhesive peptide arginine-glycine-aspartate (RGD) was nanopatterned on a non-fouling poly(ethylene glycol) (PEG) hydrogel, and mesenchymal stem cells (MSCs) derived from rat bone marrow were cultured on the patterned surfaces at nanospacings from 37 to 124 nm. Cell adhesion parameters such as spreading areas varied with RGD nanospacings significantly. The differences were well observed at both the first and eighth days, which confirmed the persistence of this nanospacing effect on our nanopatterns. The proliferation rate also varied with the nanospacings. Osteogenic and adipogenic inductions were undertaken, and a significant influence of RGD nanospacing on stem cell differentiation was found. The effect on differentiation cannot be simply interpreted by differences in cell adhesion and proliferation. We further calculated the fractions of single, coupled, and multiple cells on those nanopatterns, and ruled out the possibility that the extent of cell-cell contact determined the different differentiation fractions. Accordingly, we reinforced the idea that RGD nanospacing might directly influence stem cell differentiation.
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Affiliation(s)
- Xuan Wang
- State Key Laboratory of Molecular Engineering of Polymers; Department of Macromolecular Science; Fudan University; Shanghai, PR China
| | - Kai Ye
- State Key Laboratory of Molecular Engineering of Polymers; Department of Macromolecular Science; Fudan University; Shanghai, PR China
| | - Zhenhua Li
- State Key Laboratory of Molecular Engineering of Polymers; Department of Macromolecular Science; Fudan University; Shanghai, PR China
| | - Ce Yan
- State Key Laboratory of Molecular Engineering of Polymers; Department of Macromolecular Science; Fudan University; Shanghai, PR China
| | - Jiandong Ding
- State Key Laboratory of Molecular Engineering of Polymers; Department of Macromolecular Science; Fudan University; Shanghai, PR China
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28
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Nazli C, Ergenc TI, Yar Y, Acar HY, Kizilel S. RGDS-functionalized polyethylene glycol hydrogel-coated magnetic iron oxide nanoparticles enhance specific intracellular uptake by HeLa cells. Int J Nanomedicine 2012; 7:1903-20. [PMID: 22619531 PMCID: PMC3356191 DOI: 10.2147/ijn.s29442] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
The objective of this study was to develop thin, biocompatible, and biofunctional hydrogel-coated small-sized nanoparticles that exhibit favorable stability, viability, and specific cellular uptake. This article reports the coating of magnetic iron oxide nanoparticles (MIONPs) with covalently cross-linked biofunctional polyethylene glycol (PEG) hydrogel. Silanized MIONPs were derivatized with eosin Y, and the covalently cross-linked biofunctional PEG hydrogel coating was achieved via surface-initiated photopolymerization of PEG diacrylate in aqueous solution. The thickness of the PEG hydrogel coating, between 23 and 126 nm, was tuned with laser exposure time. PEG hydrogel-coated MIONPs were further functionalized with the fibronectin-derived arginine-glycine-aspartic acid-serine (RGDS) sequence, in order to achieve a biofunctional PEG hydrogel layer around the nanoparticles. RGDS-bound PEG hydrogel-coated MIONPs showed a 17-fold higher uptake by the human cervical cancer HeLa cell line than that of amine-coated MIONPs. This novel method allows for the coating of MIONPs with nano-thin biofunctional hydrogel layers that may prevent undesirable cell and protein adhesion and may allow for cellular uptake in target tissues in a specific manner. These findings indicate that the further biofunctional PEG hydrogel coating of MIONPs is a promising platform for enhanced specific cell targeting in biomedical imaging and cancer therapy.
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Affiliation(s)
- Caner Nazli
- Graduate School of Sciences and Engineering, Koç University, Istanbul, Turkey
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29
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Mo F, Yue J, Zhang J, Howk K, Williams A. Evaluation of Perivascular Adhesion Formation in New Zealand White Rabbits Using Oxiplex and DuraSeal Xact Adhesion Barrier System. Int J Spine Surg 2009; 3:68-76. [PMID: 25802630 DOI: 10.1016/SASJ-2009-0006-NT] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2009] [Accepted: 05/27/2009] [Indexed: 11/21/2022] Open
Abstract
Background Adhesion formation after spine surgery is a result of normal wound healing that may place patients at increased risk for complications during revision surgery. Preventing adhesions could reduce the risk of complications during revision surgery, and possibly reduce the need for revision procedures. This study evaluates the ability of DuraSeal Xact Adhesion Barrier System (DSX) (Covidien, Mansfield, Massachusetts) and Oxiplex/SP gel (OX) (FzioMed, San Luis Obispo, California) to affect the extent and severity of postoperative perivascular adhesion development in an anterior spinal surgical rabbit model. Methods We determined the extent and severity of postoperative adhesion development 34 days after surgery in 12 male New Zealand White rabbits randomly assigned to intraoperative treatment with either DSX or OX, or to an untreated control group. Adhesion severity and extent were scored on scale from 0 (none) to 3 (severe). Results The extent and severity of adhesions in the DSX group were significantly less than in the untreated control group. The DSX group mean extent score was 1.3 ± 0.5 (vs 2.5, P = .01) and the mean severity score was 1.25 ± 0.5 (vs 2.8, P = .005). The extent and severity of adhesions in the OX group were not significantly different from the control group. Conclusion In this study, we found DSX to be the most effective compound in preventing adhesion formation after anterior spine surgery. Clinical Relevance Extrapolating these results in rabbits to humans, less scarring between the major blood vessels could decrease the rate of complications in revision spine procedures.
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