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Rodriguez-Rivera GJ, Green M, Shah V, Leyendecker K, Cosgriff-Hernandez E. A user's guide to degradation testing of polyethylene glycol-based hydrogels: From in vitro to in vivo studies. J Biomed Mater Res A 2024; 112:1200-1212. [PMID: 37715481 DOI: 10.1002/jbm.a.37609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 08/21/2023] [Accepted: 08/29/2023] [Indexed: 09/17/2023]
Abstract
Poly(ethylene glycol) (PEG)-based hydrogels have gained significant attention in the field of biomedical applications due to their versatility and antifouling properties. Acrylate-derivatized PEG hydrogels (PEGDA) are some of the most widely studied hydrogels; however, there has been debate around the degradation mechanism and predicting resorption rates. Several factors influence the degradation rate of PEG hydrogels, including backbone and endgroup chemistry, macromer molecular weight, and polymer concentration. In addition to hydrogel parameters, it is necessary to understand the influence of biological and environmental conditions (e.g., pH and temperature) on hydrogel degradation. Rigorous methods for monitoring degradation in both in vitro and in vivo settings are also critical to hydrogel design and development. Herein, we provide guidance on tailoring PEG hydrogel chemistry to achieve target hydrolytic degradation kinetics for both resorbable and biostable applications. A detailed overview of accelerated testing methods and hydrogel degradation characterization is provided to aid researchers in experimental design and interpreting in vitro-in vivo correlations necessary for predicting hydrogel device performance.
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Affiliation(s)
| | - Mykel Green
- Department of Biomedical Engineering, The University of Texas, Austin, Texas, USA
| | - Vani Shah
- Department of Biomedical Engineering, The University of Texas, Austin, Texas, USA
| | - Kathleen Leyendecker
- Department of Mechanical Engineering, The University of Texas, Austin, Texas, USA
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2
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Chen J, Luo Y. Disodium Cromoglycate Templates Anisotropic Short-Chain PEG Hydrogels. ACS APPLIED MATERIALS & INTERFACES 2024; 16:33223-33234. [PMID: 38885610 DOI: 10.1021/acsami.4c07181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/20/2024]
Abstract
Anisotropic hydrogels have found widespread applications in biomedical engineering, particularly as scaffolds for tissue engineering. However, it remains a challenge to produce them using conventional fabrication methods, without specialized synthesis or equipment, such as 3D printing and unidirectional stretching. In this study, we explore the self-assembly behaviors of polyethylene glycol diacrylate (PEGDA), using disodium cromoglycate (DSCG), a lyotropic chromonic liquid crystal, as a removable template. The affinity between short-chain PEGDA (Mn = 250) and DSCG allows polymerization to take place at the DSCG surface, thereby forming anisotropic hydrogel networks with fibrin-like morphologies. This process requires considerable finesse as the phase behaviors of DSCG depend on a multitude of factors, including the weight percentage of PEGDA and DSCG, the chain length of PEGDA, and the concentration of ionic species. The key to modulating the microstructures of the all-PEG hydrogel networks is through precise control of the DSCG concentration, resulting in anisotropic mechanical properties. Using these anisotropic hydrogel networks, we demonstrate that human dermal fibroblasts are particularly sensitive to the alignment order. We find that cells exhibit a density-dependent activation pattern of a Yes-associated protein, a mechanotransducer, corroborating its role in enabling cells to translate external mechanical and morphological patterns to specific behaviors. The flexibility of modulating microstructure, along with PEG hydrogels' biocompatibility and biodegradability, underscores their potential use for tissue engineering to create functional structures with physiological morphologies.
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Affiliation(s)
- Juan Chen
- Department of Mechanical Engineering and Materials Science, Yale University, New Haven, Connecticut 06511, United States
| | - Yimin Luo
- Department of Mechanical Engineering and Materials Science, Yale University, New Haven, Connecticut 06511, United States
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3
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Nguyen MA, Dinh NT, Do Thi MH, Nguyen Thi D, Pham UT, Tran TQ, Nguyen VM, Le NH, Nguyen DT, Pham DTN. Simple and Rapid Method of Microwell Array Fabrication for Drug Testing on 3D Cancer Spheroids. ACS OMEGA 2024; 9:16949-16958. [PMID: 38645317 PMCID: PMC11024980 DOI: 10.1021/acsomega.3c05873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 11/30/2023] [Accepted: 12/12/2023] [Indexed: 04/23/2024]
Abstract
Three-dimensional (3D) cell culture systems are becoming increasingly popular due to their ability to mimic the complex process of angiogenesis in cancer, providing more accurate and physiologically relevant data than traditional two-dimensional (2D) cell culture systems. Microwell systems are particularly useful in this context as they provide a microenvironment that more closely resembles the in vivo environment than traditional microwells. Poly(ethylene glycol) (PEG) microwells are particularly advantageous due to their bio-inertness and the ability to tailor their material characteristics depending on the PEG molecular weight. Although there are several methods available for microwell fabrication, most of them are time-consuming and expensive. The current study utilizes a low-cost laser etching technique on poly(methyl methacrylate) materials followed by molding with PDMS to produce microwells. The optimal conditions for making concave microwells are an engraving parameter speed of 600 mm/s, power of 20%, and a design diameter of the microwell of 0.4 mm. The artificial tumor achieved its full size after 7 days of cell growth in a microwell system, and the cells developed drugs through a live/dead assay test. The results of the drug testing revealed that the IC50 value of zerumbone-loaded liposomes in HepG2 was 4.53 pM, which is greater than the IC50 value of zerumbone. The HepG2 cancer sphere's 3D platform for medication testing revealed that zerumbone-loaded liposomes were very effective at high doses. These findings generally imply that zerumbone-loaded liposomes have the capacity to target the liver and maintain medication delivery.
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Affiliation(s)
- Mai Anh Nguyen
- Institute
for Tropical Technology, Vietnam Academy
of Science and Technology (VAST), 18 Hoang Quoc Viet st., Cau Giay dist., Hanoi 100000, Vietnam
| | - Nhung Thi Dinh
- Hanoi
University of Science and Technology (HUST), 1 Dai Co Viet st., Hai Ba Trung
dist., Hanoi 100000, Vietnam
| | - My Hanh Do Thi
- Institute
for Tropical Technology, Vietnam Academy
of Science and Technology (VAST), 18 Hoang Quoc Viet st., Cau Giay dist., Hanoi 100000, Vietnam
| | - Dung Nguyen Thi
- Institute
for Tropical Technology, Vietnam Academy
of Science and Technology (VAST), 18 Hoang Quoc Viet st., Cau Giay dist., Hanoi 100000, Vietnam
| | - Uyen Thu Pham
- Institute
for Tropical Technology, Vietnam Academy
of Science and Technology (VAST), 18 Hoang Quoc Viet st., Cau Giay dist., Hanoi 100000, Vietnam
- University
of Science and Technology of Hanoi (USTH), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet st., Cau Giay
dist., Hanoi 100000, Vietnam
| | - Toan Quoc Tran
- Graduate
University of Science and Technology, Vietnam
Academy of Science and Technology (VAST), 18 Hoang Quoc Viet st., Cau Giay dist., Hanoi 100000, Vietnam
- Institute
of Natural Products Chemistry, Vietnam Academy
of Science and Technology (VAST), 18 Hoang Quoc Viet St., Cau Giay Dist., Hanoi 100000, Vietnam
| | - Vuong Minh Nguyen
- Institute
of Natural Products Chemistry, Vietnam Academy
of Science and Technology (VAST), 18 Hoang Quoc Viet St., Cau Giay Dist., Hanoi 100000, Vietnam
| | - Nhung Hong Le
- Graduate
University of Science and Technology, Vietnam
Academy of Science and Technology (VAST), 18 Hoang Quoc Viet st., Cau Giay dist., Hanoi 100000, Vietnam
- Institute
of Natural Products Chemistry, Vietnam Academy
of Science and Technology (VAST), 18 Hoang Quoc Viet St., Cau Giay Dist., Hanoi 100000, Vietnam
| | - Duong Thanh Nguyen
- Institute
for Tropical Technology, Vietnam Academy
of Science and Technology (VAST), 18 Hoang Quoc Viet st., Cau Giay dist., Hanoi 100000, Vietnam
- Graduate
University of Science and Technology, Vietnam
Academy of Science and Technology (VAST), 18 Hoang Quoc Viet st., Cau Giay dist., Hanoi 100000, Vietnam
| | - Dung Thuy Nguyen Pham
- NTT Institute
of Applied Technology and Sustainable Development, Nguyen Tat Thanh University, Ho
Chi Minh City 70000, Vietnam
- Faculty
of Environmental and Food Engineering, Nguyen
Tat Thanh University, Ho Chi Minh
City 70000, Vietnam
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4
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Singh K, Wychowaniec JK, Edwards-Gayle CJC, Reynaud EG, Rodriguez BJ, Brougham DF. Structure-dynamics correlations in composite PF127-PEG-based hydrogels; cohesive/hydrophobic interactions determine phase and rheology and identify the role of micelle concentration in controlling 3D extrusion printability. J Colloid Interface Sci 2024; 660:302-313. [PMID: 38244497 DOI: 10.1016/j.jcis.2023.12.151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 12/19/2023] [Accepted: 12/26/2023] [Indexed: 01/22/2024]
Abstract
A library of composite polymer networks (CPNs) were formed by combining Pluronic F127, as the primary gelator, with a range of di-acrylate functionalised PEG polymers, which tune the rheological properties and provide UV crosslinkability. A coarse-grained sol-gel room temperature phase diagram was constructed for the CPN library, which identifies PEG-dependent disruption of micelles as leading to liquefication. Small angle X-ray scattering and rheological measurements provide detailed insight into; (i) micelle-micelle ordering; (ii) micelle-micelle disruption, and; (iii) acrylate-micelle disruption; with contributions that depend on composition, including weak PEG chain length and end group effects. The influence of composition on 3D extrusion printability through modulation of the cohesive/hydrophobic interactions was assessed. It was found that only micelle content provides consistent changes in printing fidelity, controlled largely by printing conditions (pressure and feed rate). Finally, the hydrogels were shown to be UV photo-crosslinkable, which further improves fidelity and structural integrity, and usefully reduces the mesh size. Our results provide a guide for design of 3D-printable CPN inks for future biomedical applications.
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Affiliation(s)
- Krutika Singh
- School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Jacek K Wychowaniec
- School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland; AO Research Institute Davos, Clavadelerstrasse 8, 7270, Davos, Switzerland.
| | | | - Emmanuel G Reynaud
- Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Dublin 4, Ireland
| | - Brian J Rodriguez
- Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Dublin 4, Ireland; School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
| | - Dermot F Brougham
- School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland.
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5
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Shur M, Akouissi O, Rizzo O, Colin DJ, Kolinski JM, Lacour SP. Revealing the complexity of ultra-soft hydrogel re-swelling inside the brain. Biomaterials 2023; 294:122024. [PMID: 36716587 DOI: 10.1016/j.biomaterials.2023.122024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 12/12/2022] [Accepted: 01/20/2023] [Indexed: 01/27/2023]
Abstract
The brain is an ultra-soft viscoelastic matrix. Sub-kPa hydrogels match the brain's mechanical properties but are challenging to manipulate in an implantable format. We propose a simple fabrication and processing sequence, consisting of de-hydration, patterning, implantation, and re-hydration steps, to deliver brain-like hydrogel implants into the nervous tissue. We monitored in real-time the ultra-soft hydrogel re-swelling kinetics in vivo using microcomputed tomography, achieved by embedding gold nanoparticles inside the hydrogel for contrast enhancement. We found that re-swelling in vivo strongly depends on the implant geometry and water availability at the hydrogel-tissue interface. Buckling of the implant inside the brain occurs when the soft implant is tethered to the cranium. Finite-element and analytical models reveal how the shank geometry, modulus and anchoring govern in vivo buckling. Taken together, these considerations on re-swelling kinetics of hydrogel constructs, implant geometry and soft implant-tissue mechanical interplay can guide the engineering of biomimetic brain implants.
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Affiliation(s)
- Michael Shur
- Bertarelli Foundation Chair in Neuroprosthetic Technology, Laboratory for Soft Bioelectronic Interfaces, Neuro-X Institute, École Polytechnique Fedérale de Lausanne (EPFL), 1202, Geneva, Switzerland
| | - Outman Akouissi
- Bertarelli Foundation Chair in Neuroprosthetic Technology, Laboratory for Soft Bioelectronic Interfaces, Neuro-X Institute, École Polytechnique Fedérale de Lausanne (EPFL), 1202, Geneva, Switzerland; Bertarelli Foundation Chair in Translational Neuroengineering, Institute of Bioengineering, Center for Neuroprosthetics, École Polytechnique Fédérale de Lausanne (EPFL), 1202, Geneva, Switzerland
| | - Olivier Rizzo
- Bertarelli Foundation Chair in Neuroprosthetic Technology, Laboratory for Soft Bioelectronic Interfaces, Neuro-X Institute, École Polytechnique Fedérale de Lausanne (EPFL), 1202, Geneva, Switzerland
| | - Didier J Colin
- Preclinical Imaging Platform, Faculty of Medicine, University of Geneva, 1211, Geneva, Switzerland
| | - John M Kolinski
- Laboratory of Engineering Mechanics of Soft Interfaces, Institute of Mechanical Engineering, École Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
| | - Stéphanie P Lacour
- Bertarelli Foundation Chair in Neuroprosthetic Technology, Laboratory for Soft Bioelectronic Interfaces, Neuro-X Institute, École Polytechnique Fedérale de Lausanne (EPFL), 1202, Geneva, Switzerland.
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6
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Williams TJ, Jeevarathinam AS, Jivan F, Baldock V, Kim P, McShane MJ, Alge DL. Glucose biosensors based on Michael addition crosslinked poly(ethylene glycol) hydrogels with chemo-optical sensing microdomains. J Mater Chem B 2023; 11:1749-1759. [PMID: 36723375 DOI: 10.1039/d2tb02339c] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Continuous glucose monitoring (CGM) devices have the potential to lead to better disease management and improved outcomes in patients with diabetes. Chemo-optical glucose sensors offer a promising, accurate, long-term alternative to the current CGMs that require frequent calibration and replacement. Recently, we have proposed glucose sensor designs using phosphorescence lifetime-based measurement of chemo-optical glucose sensing microdomains embedded within alginate hydrogels. Due to the poor long-term stability of calcium-crosslinked alginate, we propose poly(ethylene glycol) (PEG) hydrogels synthesized via thiol-Michael addition chemistry as an alternative hydrogel carrier. The objective of this study was to evaluate the suitability of Michael addition crosslinked PEG hydrogels compared to calcium crosslinked alginate hydrogels for encapsulating glucose-sensing microdomains. PEG hydrogels crosslinked via thiol-vinyl sulfone addition achieved gelation in under 5 minutes, resulting in an even distribution of sensing microdomains. The shear storage modulus of the PEG hydrogels was tunable from 2.2 ± 0.1 kPa to 9.5 ± 1.8 kPa, which was comparable to the alginate hydrogels (10.5 ± 0.8 kPa), and the inclusion of microdomains did not significantly impact stiffness. The high water content of PEG hydrogels resulted in high glucose permeability that closely corresponded to the glucose permeability of alginate (D = 0.09 and 0.12 cm2 s-1, respectively; p = 0.47), but the PEG hydrogels exhibited superior stability. Both PEG and alginate-embedded sensors exhibited a sensing range up to ∼200 mg dL-1 glucose. The lower limits of detection (LOD) for PEG and alginate-based glucose sensors were 19.8 and 20.6 mg dL-1 with a difference of just 4.2% variation. The small difference between PEG and alginate embedded sensors indicates that their sensing properties are primarily determined by the glucose sensing microdomains rather than the hydrogel matrix. Overall, the results of this study indicate that Michael addition-crosslinked PEG hydrogels are a promising platform for encapsulation of chemo-optical glucose sensing microdomains.
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Affiliation(s)
- Tyrell J Williams
- Department of Biomedical Engineering, Texas A&M University, College Station, Texas, USA.
| | | | - Faraz Jivan
- Department of Biomedical Engineering, Texas A&M University, College Station, Texas, USA.
| | - Victoria Baldock
- Department of Biomedical Engineering, Texas A&M University, College Station, Texas, USA.
| | - Paul Kim
- Department of Biomedical Engineering, Texas A&M University, College Station, Texas, USA.
| | - Michael J McShane
- Department of Biomedical Engineering, Texas A&M University, College Station, Texas, USA. .,Department of Materials Science and Engineering, Texas A&M University, College Station, Texas, USA
| | - Daniel L Alge
- Department of Biomedical Engineering, Texas A&M University, College Station, Texas, USA. .,Department of Materials Science and Engineering, Texas A&M University, College Station, Texas, USA
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7
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Yoon JP, Kim DH, Min SG, Kim HM, Choi JH, Lee HJ, Park KH, Kim SS, Chung SW, Yoon SH. Effects of a graphene oxide-alginate sheet scaffold on rotator cuff tendon healing in a rat model. J Orthop Surg (Hong Kong) 2022; 30:10225536221125950. [PMID: 36121787 DOI: 10.1177/10225536221125950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Natural polymer scaffolds used to promote rotator cuff healing have limitations in terms of their mechanical and biochemical properties. This animal study aimed to investigate the effects of combined graphene oxide (GO) and alginate scaffold and the toxicity of GO on rotator cuff healing in a rat model. METHODS First, the mechanical properties of a GO/alginate scaffold and a pure alginate scaffold were compared. The in vitro cytotoxicity of and proliferation of human tenocytes with the GO/alginate scaffold were evaluated by CCK-8 assay. For the in vivo experiment, 20 male rats were randomly divided into two groups (n = 10 each), and supraspinatus repair was performed: group 1 underwent supraspinatus repair alone, and group 2 underwent supraspinatus repair with the GO/alginate scaffold. Biomechanical and histological analyses were performed to evaluate the quality of tendon-to-bone healing 8 weeks after rotator cuff repair. RESULTS The GO/alginate scaffold exhibited an increased maximum load (p = .001) and tensile strength (p = .001). In the cytotoxicity test, the cell survival rate with the GO/alginate scaffold was 102.08%. The proliferation rate of human tenocytes was no significant difference between the GO/alginate and alginate groups for 1, 3, 5, and 7 days. Biomechanically, group 2 exhibited a significantly greater ultimate failure load (p < .001), ultimate stress (p < .001), and stiffness (p < .001) than group 1. The histological analysis revealed that the tendon-to-bone interface in group 2 showed more collagen fibers bridging, tendon-to-bone integration, longitudinally oriented collagen fibers, and fibrocartilage formation than in group 1. CONCLUSION A small amount of GO added to alginate improved the mechanical properties of the scaffold without evidence of cytotoxicity. At 8 weeks after rotator cuff repair, the GO/alginate scaffold improved tendon-to-bone healing without causing any signs of toxicity in a rat model.
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Affiliation(s)
- Jong Pil Yoon
- Department of Orthopaedic Surgery, School of Medicine, 34986Kyungpook National University, Daegu, Korea
| | - Dong Hyun Kim
- Department of Orthopaedic Surgery, School of Medicine, 34986Kyungpook National University, Daegu, Korea
| | - Seung Gi Min
- Department of Orthopaedic Surgery, School of Medicine, 34986Kyungpook National University, Daegu, Korea
| | - Hun-Min Kim
- 65672Korea Dyeing & Finishing Technology Institute, Daegu, Korea
| | - Jin-Hyun Choi
- Department of Bio-Fibers and Materials Science, 34986Kyungpook National University, Daegu, Korea
| | - Hyun Joo Lee
- Department of Orthopaedic Surgery, School of Medicine, 34986Kyungpook National University, Daegu, Korea
| | - Kyeong Hyeon Park
- Department of Orthopaedic Surgery, School of Medicine, 34986Kyungpook National University, Daegu, Korea
| | - Seong Soo Kim
- Department of Orthopaedic Surgery, School of Medicine, 34986Kyungpook National University, Daegu, Korea
| | - Seok Won Chung
- Department of Orthopaedic Surgery, School of Medicine, 34986Konkuk University, Seoul, Korea
| | - Sung Hyuk Yoon
- Department of Orthopaedic Surgery, School of Medicine, 34986Kyungpook National University, Daegu, Korea
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8
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Ng S, Williamson C, van Zee M, Di Carlo D, Santa Maria SR. Enabling Clonal Analyses of Yeast in Outer Space by Encapsulation and Desiccation in Hollow Microparticles. LIFE (BASEL, SWITZERLAND) 2022; 12:life12081168. [PMID: 36013347 PMCID: PMC9410522 DOI: 10.3390/life12081168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 07/23/2022] [Accepted: 07/26/2022] [Indexed: 11/16/2022]
Abstract
Studying microbes at the single-cell level in space can accelerate human space exploration both via the development of novel biotechnologies and via the understanding of cellular responses to space stressors and countermeasures. High-throughput technologies for screening natural and engineered cell populations can reveal cellular heterogeneity and identify high-performance cells. Here, we present a method to desiccate and preserve microbes in nanoliter-scale compartments, termed PicoShells, which are microparticles with a hollow inner cavity. In PicoShells, single cells are confined in an inner aqueous core by a porous hydrogel shell, allowing the diffusion of nutrients, wastes, and assay reagents for uninhibited cell growth and flexible assay protocols. Desiccated PicoShells offer analysis capabilities for single-cell derived colonies with a simple, low resource workflow, requiring only the addition of water to rehydrate hundreds of thousands of PicoShells and the single microbes encapsulated inside. Our desiccation method results in the recovery of desiccated microparticle morphology and porosity after a multi-week storage period and rehydration, with particle diameter and porosity metrics changing by less than 18% and 7%, respectively, compared to fresh microparticles. We also recorded the high viability of Saccharomyces cerevisiae yeast desiccated and rehydrated inside PicoShells, with only a 14% decrease in viability compared to non-desiccated yeast over 8.5 weeks, although we observed an 85% decrease in initial growth potential over the same duration. We show a proof-of-concept for a growth rate-based analysis of single-cell derived colonies in rehydrated PicoShells, where we identified 11% of the population that grows at an accelerated rate. Desiccated PicoShells thus provide a robust method for cell preservation before and during launch, promising a simple single-cell analysis method for studying heterogeneity in microbial populations in space.
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Affiliation(s)
- Simon Ng
- Department of Bioengineering, University of California—Los Angeles, Los Angeles, CA 90095, USA; (S.N.); (C.W.); (M.v.Z.)
- Space Life Sciences Training Program, NASA Ames Research Center, Mountain View, CA 94035, USA
| | - Cayden Williamson
- Department of Bioengineering, University of California—Los Angeles, Los Angeles, CA 90095, USA; (S.N.); (C.W.); (M.v.Z.)
| | - Mark van Zee
- Department of Bioengineering, University of California—Los Angeles, Los Angeles, CA 90095, USA; (S.N.); (C.W.); (M.v.Z.)
| | - Dino Di Carlo
- Department of Bioengineering, University of California—Los Angeles, Los Angeles, CA 90095, USA; (S.N.); (C.W.); (M.v.Z.)
- Department of Mechanical and Aerospace Engineering, University of California—Los Angeles, Los Angeles, CA 90095, USA
- California NanoSystems Institute (CNSI), University of California—Los Angeles, Los Angeles, CA 90095, USA
- Correspondence: (D.D.C.); (S.R.S.M.)
| | - Sergio R. Santa Maria
- Space Biosciences, NASA Ames Research Center, Mountain View, CA 94035, USA
- KBR, Fully Integrated Lifecycle Mission Support Services, Mountain View, CA 94035, USA
- Correspondence: (D.D.C.); (S.R.S.M.)
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9
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Analysis of model drug permeation through highly crosslinked and biodegradable polyethylene glycol membranes. J Memb Sci 2022. [DOI: 10.1016/j.memsci.2021.120218] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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10
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Das M, Hahm KS, LaRocca AA, Luna CA, Mendez K, Hoffman R, Verheyen CA, Kim TG, Wamakima BW, Roche E. A Low-Cost, Easily Deployable Vesicovaginal Fistula Occluding Device for Providing Interim Continence. J Med Device 2022. [DOI: 10.1115/1.4053603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Abstract
Vesicovaginal fistulas (VVFs), abnormal openings between the vagina and bladder, disrupt the lives of millions of people worldwide due to resulting incontinence and infections. VVFs are commonly treated with surgery after the fistula has had time to heal over several months. In low-resource areas, the immediate incontinence often leads to ostracization from the community, and can be devastating for the patient. To occlude the fistula and enable full continence until the patient is able to access surgery, we have designed a three-tiered silicone plug consisting of a bladder-dwelling disc, a mid-fistula disc, and a vagina-dwelling cross-shaped tapered plug, all supported on a central stem.
The device withstands typical expulsion forces from the bladder and does not leak under typical bladder filling or urination pressures. The maximum device expulsion force is 3.69 N and it is watertight up to 100 cmH2O or 9.8 kPa. It is designed to be easily deployed by trained community members without medical qualifications.
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Affiliation(s)
- Madhurima Das
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
| | - Katie S. Hahm
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
| | - Ava A. LaRocca
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
| | - Cecilia Alessandra Luna
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
| | - Keegan Mendez
- Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139
| | - Rachel Hoffman
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
| | - Connor A. Verheyen
- Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139
| | - Tesia G. Kim
- Gynecology and Reproductive Biology, Beth Israel Deaconess Medical Center, Boston, MA 02215
| | | | - Ellen Roche
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
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11
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Diba M, Koons GL, Bedell ML, Mikos AG. 3D printed colloidal biomaterials based on photo-reactive gelatin nanoparticles. Biomaterials 2021; 274:120871. [PMID: 34029914 PMCID: PMC8196631 DOI: 10.1016/j.biomaterials.2021.120871] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 04/20/2021] [Accepted: 04/28/2021] [Indexed: 12/11/2022]
Abstract
Biomaterials-based strategies have shown great promise for tissue regeneration. 3D printing technologies can deliver unprecedented control over architecture and properties of biomaterial constructs when combined with innovative material design strategies. Colloidal gels made of polymeric nanoparticles are attractive injectable and self-healing systems, but their use as bio-inks for extrusion-based printing is largely unexplored. Here, we report 3D printing of novel biomaterial constructs with shape memory behavior using photo-reactive gelatin nanoparticles as colloidal building blocks. These nanoparticles are stabilized with intraparticle covalent crosslinks, and also contain pendant methacryloyl groups as photo-reactive moieties. While non-covalent interactions between nanoparticles enable formation of colloidal gel inks that are printable at room temperature, UV-induced covalent interparticle crosslinks based on methacryloyl moieties significantly enhance mechanical properties of printed constructs. Additionally, the UV crosslinking modality enables remarkable control over swelling, degradation, and biomolecule release behavior of 3D constructs. Finally, by exploiting the mechanical properties of colloidal biomaterials after UV crosslinking, 3D constructs can be designed with shape memory properties, returning to their original programmed geometry upon re-hydration. Accordingly, these novel colloidal inks exhibit great potential to serve as bio-inks for 3D printing of biomaterials with shape-morphing features for a wide range of tissue engineering and regenerative medicine applications.
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Affiliation(s)
- Mani Diba
- Department of Bioengineering, Rice University, Houston, TX, USA; NIH/NIBIB Center for Engineering Complex Tissues, USA
| | - Gerry L Koons
- Department of Bioengineering, Rice University, Houston, TX, USA; NIH/NIBIB Center for Engineering Complex Tissues, USA
| | - Matthew L Bedell
- Department of Bioengineering, Rice University, Houston, TX, USA; NIH/NIBIB Center for Engineering Complex Tissues, USA
| | - Antonios G Mikos
- Department of Bioengineering, Rice University, Houston, TX, USA; NIH/NIBIB Center for Engineering Complex Tissues, USA.
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Lee H, Kim DI, Kwon SH, Park S. Magnetically Actuated Drug Delivery Helical Microrobot with Magnetic Nanoparticle Retrieval Ability. ACS APPLIED MATERIALS & INTERFACES 2021; 13:19633-19647. [PMID: 33877809 DOI: 10.1021/acsami.1c01742] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Therapeutic drug delivery microrobots capable of accurate targeting using an electromagnetic actuation (EMA) system are being developed. However, these drug delivery microrobots include a large number of magnetic nanoparticles (MNPs) for accurate EMA targeting, which causes side effects, such as problems with membrane integrity and normal cell apoptosis. Here, a biocompatible and hydrolyzable PEGDA-based drug delivery helical microrobot capable of MNP retrieval is proposed in which doxorubicin (DOX), an anticancer drug, is encapsulated and MNPs are conjugated by a disulfide bond. After being accurately delivered to the lesion of cancer cells through magnetic field manipulation, the fabricated microrobot provides rapid MNP separation and retrieval from the microrobot because of the use of dithiothreitol (DTT), a reducing agent, as an environment similar to the surrounding cancer cells and near-infrared (NIR) as an external stimulus. The characteristics of the fabricated microrobot are analyzed, and fundamental tests for active electromagnetic field manipulation, separation/retrieval of MNPs from the microrobot, and its hydrolysis are discussed. The therapeutic performance of the fabricated microrobot is verified through an in vitro test using tumor cells. Consequently, by use of an integrated system of microscope, eight-coil EMA, and NIR it is shown that the proposed microrobot can be moved to the target site by electromagnetic manipulation. The MNPs conjugated to the microrobot can be separated and retrieved, and the therapeutic effect on tumor cells by the encapsulated drug can be seen.
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Affiliation(s)
- Hyoryong Lee
- Department of Robotics Engineering, Daegu Gyeongbuk Institute of Science and Technology, Daegu 42988, Republic of Korea
| | - Dong-In Kim
- Department of Robotics Engineering, Daegu Gyeongbuk Institute of Science and Technology, Daegu 42988, Republic of Korea
| | - Su-Hyun Kwon
- Department of Robotics Engineering, Daegu Gyeongbuk Institute of Science and Technology, Daegu 42988, Republic of Korea
| | - Sukho Park
- Department of Robotics Engineering, Daegu Gyeongbuk Institute of Science and Technology, Daegu 42988, Republic of Korea
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Smart antifungal thermosensitive chitosan/carboxymethylcellulose/scleroglucan/montmorillonite nanocomposite hydrogels for onychomycosis treatment. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125600] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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14
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Ma C, Li B, Shao B, Wu B, Chen D, Su J, Zhang H, Liu K. Anisotropic Protein Organofibers Encoded With Extraordinary Mechanical Behavior for Cellular Mechanobiology Applications. Angew Chem Int Ed Engl 2020; 59:21481-21487. [DOI: 10.1002/anie.202009569] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Indexed: 12/31/2022]
Affiliation(s)
- Chao Ma
- Department of Chemistry Tsinghua University Beijing 100084 China
- State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China
- School of Engineering and Applied Sciences & Department of Physics Harvard University 29 Oxford Street Cambridge MA 02138 USA
| | - Bo Li
- State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China
| | - Baiqi Shao
- State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China
| | - Baiheng Wu
- Institute of Process Equipment College of Energy Engineering and State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou 310027 China
| | - Dong Chen
- Institute of Process Equipment College of Energy Engineering and State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou 310027 China
| | - Juanjuan Su
- Genetics and Aging Research Unit McCance Center for Brain Health MassGeneral Institute for Neurodegenerative Disease Department of Neurology Massachusetts General Hospital and Harvard Medical School Charlestown MA USA
- Groningen Biomolecular Sciences and Biotechnology Institute and Zernike Institute for Advanced Materials University of Groningen Groningen The Netherlands
| | - Hongjie Zhang
- Department of Chemistry Tsinghua University Beijing 100084 China
- State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China
| | - Kai Liu
- Department of Chemistry Tsinghua University Beijing 100084 China
- State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China
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Ma C, Li B, Shao B, Wu B, Chen D, Su J, Zhang H, Liu K. Anisotropic Protein Organofibers Encoded With Extraordinary Mechanical Behavior for Cellular Mechanobiology Applications. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202009569] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Chao Ma
- Department of Chemistry Tsinghua University Beijing 100084 China
- State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China
- School of Engineering and Applied Sciences & Department of Physics Harvard University 29 Oxford Street Cambridge MA 02138 USA
| | - Bo Li
- State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China
| | - Baiqi Shao
- State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China
| | - Baiheng Wu
- Institute of Process Equipment College of Energy Engineering and State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou 310027 China
| | - Dong Chen
- Institute of Process Equipment College of Energy Engineering and State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou 310027 China
| | - Juanjuan Su
- Genetics and Aging Research Unit McCance Center for Brain Health MassGeneral Institute for Neurodegenerative Disease Department of Neurology Massachusetts General Hospital and Harvard Medical School Charlestown MA USA
- Groningen Biomolecular Sciences and Biotechnology Institute and Zernike Institute for Advanced Materials University of Groningen Groningen The Netherlands
| | - Hongjie Zhang
- Department of Chemistry Tsinghua University Beijing 100084 China
- State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China
| | - Kai Liu
- Department of Chemistry Tsinghua University Beijing 100084 China
- State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China
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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, SWITZERLAND) 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] [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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Burke G, Barron V, Geever T, Geever L, Devine DM, Higginbotham CL. Evaluation of the materials properties, stability and cell response of a range of PEGDMA hydrogels for tissue engineering applications. J Mech Behav Biomed Mater 2019; 99:1-10. [PMID: 31319331 DOI: 10.1016/j.jmbbm.2019.07.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Revised: 05/16/2019] [Accepted: 07/06/2019] [Indexed: 01/12/2023]
Abstract
The main aim of this study was to examine the stability of a range of polyethyleneglycol dimethacrylate (PEGDMA) hydrogels over a 28-day period in simulated physiological solution. Upon optimisation of the ultraviolet (UV) curing conditions, the PEGDMA hydrogels were prepared using four different monomer concentrations (25, 50, 75 and 100 wt% PEGDMA) in water and cross-linked by photopolymerisation. Initial results revealed a correlation between monomer concentration and swelling behaviour, where a decrease in swelling was observed with increase in monomer content. On storage in physiological solutions at 37 °C, a decrease in the weight remaining of the hydrogels and the pH of the solutions was observed over a 28-day period. Using scanning electron microscopy, the surface topography of the hydrogels appeared to get smoother and in parallel changes in hydrophilicty were observed, with the biggest changes observed for the higher monomer concentrations where water contact angle values were seen to increase toward 90°. However, the mechanical properties remained relatively unaffected and there was no adverse effect on cell metabolic activity observed for cells grown in the presence of PEGDMA samples or using elution methods. Looking at the combination of mechanical chemical and thermal properties shown these results are an important finding for scaffolds intended for tissue engineering applications, where provision of mechanical support without the elicitation of an inflammatory response due to polymer degradation products is crucial for successful integration and neotissue formation during the first 28 days post implantation.
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Affiliation(s)
- Gavin Burke
- Materials Research Institute, Athlone Institute of Technology, Dublin Road, Co. Westmeath, Ireland
| | - Valerie Barron
- Materials Research Institute, Athlone Institute of Technology, Dublin Road, Co. Westmeath, Ireland
| | - Tess Geever
- Materials Research Institute, Athlone Institute of Technology, Dublin Road, Co. Westmeath, Ireland
| | - Luke Geever
- Materials Research Institute, Athlone Institute of Technology, Dublin Road, Co. Westmeath, Ireland
| | - Declan M Devine
- Materials Research Institute, Athlone Institute of Technology, Dublin Road, Co. Westmeath, Ireland.
| | - Clement L Higginbotham
- Materials Research Institute, Athlone Institute of Technology, Dublin Road, Co. Westmeath, Ireland.
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18
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Barnett HH, Heimbuck AM, Pursell I, Hegab RA, Sawyer BJ, Newman JJ, Caldorera-Moore ME. Poly (ethylene glycol) hydrogel scaffolds with multiscale porosity for culture of human adipose-derived stem cells. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2019; 30:895-918. [PMID: 31039085 DOI: 10.1080/09205063.2019.1612725] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Three-dimensional (3 D) hydrogel scaffolds are an attractive option for tissue regeneration applications because they allow for cell migration, fluid exchange, and can be synthesized to closely mimic the physical properties of the extracellular matrix environment. The material properties of hydrogels play a vital role in cellular migration and differentiation. In light of this, in-depth understanding of material properties is required before such scaffolds can be used to study their influence on cells. Herein, various blends and thicknesses of poly (ethylene glycol) dimethacrylate (PEGDMA) hydrogels were synthesized, flash frozen, and dried by lyophilization to create scaffolds with multiscale porosity. Environmental scanning electron microscopy (ESEM) images demonstrated that lyophilization induced microporous voids in the PEGDMA hydrogels while swelling studies show the hydrogels retain their innate swelling properties. Change in pore size was observed between drying methods, polymer blend, and thickness when imaged in the hydrated state. Human adipose-derived stem cells (hASCs) were seeded on lyophilized and non-lyophilized hydrogels to determine if the scaffolds would support cell attachment and proliferation of a clinically relevant cell type. Cell attachment and morphology of the hASCs were evaluated using fluorescence imaging. Qualitative observations in cell attachment and morphology of hASCs on the surface of the different hydrogel spatial configurations indicate these multiscale porosity hydrogels create a suitable scaffold for hASC culture. These findings offer another factor of tunability in creating biomimetic hydrogels for various tissue engineering applications including tissue repair, regeneration, wound healing, and controlled release of growth factors.
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Affiliation(s)
- Haley H Barnett
- a School of Biological Sciences, Louisiana Tech University , Ruston , LA , USA
| | - Abitha M Heimbuck
- b Department of Biomedical Engineering , Louisiana Tech University , Ruston , LA , USA
| | - India Pursell
- a School of Biological Sciences, Louisiana Tech University , Ruston , LA , USA
| | - Rachel A Hegab
- b Department of Biomedical Engineering , Louisiana Tech University , Ruston , LA , USA
| | - Benjamin J Sawyer
- b Department of Biomedical Engineering , Louisiana Tech University , Ruston , LA , USA.,c Department of chemistry, Trinity University , San Antonio , TX , USA
| | - Jamie J Newman
- a School of Biological Sciences, Louisiana Tech University , Ruston , LA , USA
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19
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Kim DH, Min SG, Yoon JP, Park GY, Choi JH, Jung JW, Lee HJ, Kim HJ, Chung SW, Kim JY. Mechanical Augmentation With Absorbable Alginate Sheet Enhances Healing of the Rotator Cuff. Orthopedics 2019; 42:e104-e110. [PMID: 30540880 DOI: 10.3928/01477447-20181206-04] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 08/08/2018] [Indexed: 02/03/2023]
Abstract
For anatomical restoration of a repaired rotator cuff, mechanical augmentation of the repaired structure is essential. Using histological and biomechanical evaluation in a rat model, the authors sought to determine the efficacy of an absorbable alginate sheet at the supraspinatus tendon-to-bone repair site for healing of the rotator cuff tear. Forty adult (12 weeks old) male Sprague- Dawley wild-type rats were used in this study. The animals were randomly separated into 2 groups: group 1, conventional supraspinatus repair with acute repair; or group 2, supraspinatus repair with absorbable alginate sheet. Biomechanical and histological analyses were performed at 6 and 12 weeks after index rotator cuff surgery. Compared with group 1, group 2 exhibited a significantly greater mean ultimate failure load (group 1, 23.70±3.87 N; group 2, 61.44±43.67 N; P=.023) and mean ultimate stress (group 1, 2.83±0.50 MPa; group 2, 7.36±2.87 MPa; P=.020). However, 6-week outcomes were not significantly different. On histological scoring, compared with group 1, group 2 exhibited a significantly greater mean 6-week score (group 1, 4.10±1.72 points; group 2, 7.80±1.47 points; P<.001) and mean 12-week score (group 1, 3.50±1.00 points; group 2, 5.25±2.62 points; P=.020). Mechanical augmentation with absorbable alginate may improve tendon healing after surgical repair of the rotator cuff. [Orthopedics. 2019; 42(1):e104-e110.].
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20
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White LJ, Keane TJ, Smoulder A, Zhang L, Castleton AA, Reing JE, Turner NJ, Dearth CL, Badylak SF. The impact of sterilization upon extracellular matrix hydrogel structure and function. ACTA ACUST UNITED AC 2018. [DOI: 10.1016/j.regen.2018.04.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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21
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Physical properties of hydrogel wound dressing and its use in low-level laser therapy (LLLT). Lasers Med Sci 2018; 33:1317-1325. [DOI: 10.1007/s10103-018-2484-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2017] [Accepted: 03/09/2018] [Indexed: 11/26/2022]
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22
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Lim WS, Chen K, Chong TW, Xiong GM, Birch WR, Pan J, Lee BH, Er PS, Salvekar AV, Venkatraman SS, Huang Y. A bilayer swellable drug-eluting ureteric stent: Localized drug delivery to treat urothelial diseases. Biomaterials 2018; 165:25-38. [PMID: 29501967 DOI: 10.1016/j.biomaterials.2018.02.035] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Revised: 02/14/2018] [Accepted: 02/18/2018] [Indexed: 10/18/2022]
Abstract
A bilayer swellable drug-eluting ureteric stent (BSDEUS) is engineered and implemented, as a sustained drug delivery platform technology that enhances localized drug delivery to the highly impermeable urothelium, for the treatment of urothelial diseases such as strictures and carcinomas. On deployment, the device swells to co-apt with the ureteric wall and ensure drug availability to these tissues. BSDEUS consists of a stent spray-coated with a polymeric drug containing polylactic acid-co-caprolactone (PLC) layer which is overlaid by a swellable polyethylene glycol diacrylate (PEGDA) based hydrogel. In-vitro quantification of released drug demonstrated a tunable time-profile, indicating sustained delivery over 1-month. The PEGDA hydrogel overlayer enhanced drug release and transport into explanted porcine ureteric tissues ex-vivo, under a simulated dynamic fluid flow. A preliminary pilot in-vivo feasibility study, in a porcine model, demonstrated that the swollen hydrogel co-apts with the urothelium and thus enables localized drug delivery to the target tissue section. Kidney functions remained unaffected and device did not result in either hydronephrosis or systemic toxicity. This successful engineering of a bilayer coated stent prototype, demonstrates its feasibility, thus offering a unique solution for drug-based urological therapy.
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Affiliation(s)
- Wei Shan Lim
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore; Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way Innovis, Singapore, 138634, Singapore; Sino-Singapore International Joint Research Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
| | - Kenneth Chen
- Department of Urology, Singapore General Hospital, 20 College Road, Singapore, 169856, Singapore.
| | - Tsung Wen Chong
- Department of Urology, Singapore General Hospital, 20 College Road, Singapore, 169856, Singapore
| | - Gordon Minru Xiong
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - William R Birch
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way Innovis, Singapore, 138634, Singapore
| | - Jisheng Pan
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way Innovis, Singapore, 138634, Singapore
| | - Bae Hoon Lee
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore; School of Biomedical Engineering, School of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, 325027, China; Wenzhou Institute of Biomaterials and Engineering, CNITECH, CAS, Wenzhou, 325001, China
| | - Pei Shan Er
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Abhijit Vijay Salvekar
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Subbu S Venkatraman
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore; Sino-Singapore International Joint Research Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
| | - Yingying Huang
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore; Sino-Singapore International Joint Research Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
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Kessler L, Gehrke S, Winnefeld M, Huber B, Hoch E, Walter T, Wyrwa R, Schnabelrauch M, Schmidt M, Kückelhaus M, Lehnhardt M, Hirsch T, Jacobsen F. Methacrylated gelatin/hyaluronan-based hydrogels for soft tissue engineering. J Tissue Eng 2017; 8:2041731417744157. [PMID: 29318000 PMCID: PMC5753891 DOI: 10.1177/2041731417744157] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Accepted: 10/25/2017] [Indexed: 12/15/2022] Open
Abstract
In vitro–generated soft tissue could provide alternate therapies for soft tissue defects. The aim of this study was to evaluate methacrylated gelatin/hyaluronan as scaffolds for soft tissue engineering and their interaction with human adipose–derived stem cells (hASCs). ASCs were incorporated into methacrylated gelatin/hyaluronan hydrogels. The gels were photocrosslinked with a lithium phenyl-2,4,6-trimethylbenzoylphosphinate photoinitiator and analyzed for cell viability and adipogenic differentiation of ASCs over a period of 30 days. Additionally, an angiogenesis assay was performed to assess their angiogenic potential. After 24 h, ASCs showed increased viability on composite hydrogels. These results were consistent over 21 days of culture. By induction of adipogenic differentiation, the mature adipocytes were observed after 7 days of culture, their number significantly increased until day 28 as well as expression of fatty acid binding protein 4 and adiponectin. Our scaffolds are promising as building blocks for adipose tissue engineering and allowed long viability, proliferation, and differentiation of ASCs.
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Affiliation(s)
- Lukas Kessler
- Department of Plastic Surgery and Burn Centre, BG University Hospital Bergmannsheil GmbH, Ruhr University Bochum, Bochum, Germany
| | - Sandra Gehrke
- Research and Development, Beiersdorf AG, Hamburg, Germany
| | - Marc Winnefeld
- Research and Development, Beiersdorf AG, Hamburg, Germany
| | - Birgit Huber
- Institute for Interfacial Engineering and Plasma Technology, University of Stuttgart, Stuttgart, Germany
| | - Eva Hoch
- Institute for Interfacial Engineering and Plasma Technology, University of Stuttgart, Stuttgart, Germany
| | | | - Ralf Wyrwa
- Biomaterials Department, INNOVENT e. V., Jena, Germany
| | | | - Malte Schmidt
- Department of Plastic Surgery and Burn Centre, BG University Hospital Bergmannsheil GmbH, Ruhr University Bochum, Bochum, Germany
| | - Maximilian Kückelhaus
- Department of Plastic Surgery and Burn Centre, BG University Hospital Bergmannsheil GmbH, Ruhr University Bochum, Bochum, Germany
| | - Marcus Lehnhardt
- Department of Plastic Surgery and Burn Centre, BG University Hospital Bergmannsheil GmbH, Ruhr University Bochum, Bochum, Germany
| | - Tobias Hirsch
- Department of Plastic Surgery and Burn Centre, BG University Hospital Bergmannsheil GmbH, Ruhr University Bochum, Bochum, Germany
| | - Frank Jacobsen
- Department of Plastic Surgery and Burn Centre, BG University Hospital Bergmannsheil GmbH, Ruhr University Bochum, Bochum, Germany
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Xiang H, Xia M, Cunningham A, Chen W, Sun B, Zhu M. Mechanical properties of biocompatible clay/P(MEO 2 MA- co -OEGMA) nanocomposite hydrogels. J Mech Behav Biomed Mater 2017; 72:74-81. [DOI: 10.1016/j.jmbbm.2017.04.026] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 04/23/2017] [Accepted: 04/25/2017] [Indexed: 12/28/2022]
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Characteristics of Reconstituted Lyophilized Tendon Hydrogel: An Injectable Scaffold for Tendon Regeneration. Plast Reconstr Surg 2016; 137:843-851. [PMID: 26910664 DOI: 10.1097/01.prs.0000480012.41411.7c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND The authors have developed a tendon hydrogel that may be injected into the site of tendon injury to improve speed and strength of repair. The aim of this study was to compare the biological and physical properties of fresh, hydrated tendon hydrogel with its reconstituted lyophilized counterpart with the goal of increasing clinical feasibility. MATERIALS Hydrogel was prepared from fresh human cadaveric flexor tendon. Fresh gel was compared to gel aliquots that were lyophilized and reconstituted with sterile deionized water. Scanning electron microscopy was used to examine the microarchitecture of gelated samples. Rat adipose-derived stem cells were seeded in hydrogel, and cell viability was assessed after 7 days. MTS colorimetric assay was used to evaluate both the effect of prolonged storage on gel and the ability of reconstituted lyophilized hydrogel to activate platelet-rich plasma. The viability and proliferation of luciferase-transfected adipose-derived stem cells embedded within hydrogel in vivo was assessed by a bioluminescence in vivo imaging system. RESULTS Reconstituted lyophilized hydrogel demonstrated similar handling properties compared to fresh gel. Adipose-derived stem cells remained viable 7 days after reseeding in both conditions. Lyophilized hydrogel retained its ability to activate platelet-rich plasma and retained 95 percent of its maximal proliferative capacity at 30 days. The in vivo imaging system demonstrated similar cell proliferation, with signal persisting through day 13. CONCLUSIONS Reconstitution of lyophilized hydrogel stimulated cell proliferation and platelet-rich plasma activation to a greater degree than did fresh hydrogel. Efficacy after prolonged storage was also shown to be superior. Therefore, this lyophilized formulation of tendon hydrogel may have wider clinical applicability.
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26
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Ramshaw JAM, Werkmeister JA, Dumsday GJ. Bioengineered collagens: emerging directions for biomedical materials. Bioengineered 2014; 5:227-33. [PMID: 24717980 DOI: 10.4161/bioe.28791] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Mammalian collagen has been widely used as a biomedical material. Nevertheless, there are still concerns about the variability between preparations, particularly with the possibility that the products may transmit animal-based diseases. Many groups have examined the possible application of bioengineered mammalian collagens. However, translating laboratory studies into large-scale manufacturing has often proved difficult, although certain yeast and plant systems seem effective. Production of full-length mammalian collagens, with the required secondary modification to give proline hydroxylation, has proved difficult in E. coli. However, recently, a new group of collagens, which have the characteristic triple helical structure of collagen, has been identified in bacteria. These proteins are stable without the need for hydroxyproline and are able to be produced and purified from E. coli in high yield. Initial studies indicate that they would be suitable for biomedical applications.
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