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Clasky AJ, Watchorn JD, Chen PZ, Gu FX. From prevention to diagnosis and treatment: Biomedical applications of metal nanoparticle-hydrogel composites. Acta Biomater 2021; 122:1-25. [PMID: 33352300 DOI: 10.1016/j.actbio.2020.12.030] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 11/22/2020] [Accepted: 12/14/2020] [Indexed: 12/21/2022]
Abstract
Recent advances in biomaterials integrate metal nanoparticles with hydrogels to generate composite materials that exhibit new or improved properties. By precisely controlling the composition, arrangement and interactions of their constituents, these hybrid materials facilitate biomedical applications through myriad approaches. In this work we seek to highlight three popular frameworks for designing metal nanoparticle-hydrogel hybrid materials for biomedical applications. In the first approach, the properties of metal nanoparticles are incorporated into a hydrogel matrix such that the composite is selectively responsive to stimuli such as light and magnetic flux, enabling precisely activated therapeutics and self-healing biomaterials. The second approach mediates the dynamic reorganization of metal nanoparticles based on environment-directed changes in hydrogel structure, leading to chemosensing, microbial and viral detection, and drug-delivery capabilities. In the third approach, the hydrogel matrix spatially arranges metal nanoparticles to produce metamaterials or passively enhance nanoparticle properties to generate improved substrates for biomedical applications including tissue engineering and wound healing. This article reviews the construction, properties and biomedical applications of metal nanoparticle-hydrogel composites, with a focus on how they help to prevent, diagnose and treat diseases. Discussion includes how the composites lead to new or improved properties, how current biomedical research leverages these properties and the emerging directions in this growing field.
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Saeki K, Hiramatsu H, Hori A, Hirai Y, Yamada M, Utoh R, Seki M. Sacrificial Alginate-Assisted Microfluidic Engineering of Cell-Supportive Protein Microfibers for Hydrogel-Based Cell Encapsulation. ACS OMEGA 2020; 5:21641-21650. [PMID: 32905425 PMCID: PMC7469388 DOI: 10.1021/acsomega.0c02385] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 08/04/2020] [Indexed: 05/04/2023]
Abstract
Although many types of technologies for hydrogel-based cell cultivation have recently been developed, strategies to integrate cell-adhesive micrometer-sized supports with bulk-scale hydrogel platforms have not been fully established. Here, we present a highly unique approach to produce cell-adhesive, protein-based microfibers assisted by the sacrificial template of alginate; we applied these fibers as microengineered scaffolds for hydrogel-based cell encapsulation. Two types of microfluidic devices were designed and fabricated: a single-layered device for producing relatively thick (Φ of 10-60 μm) alginate-protein composite fibers with a uniform cross-sectional morphology and a four-layered device for preparing thinner (Φ of ∼4 μm) ones through the formation of patterned microfibers with eight distinct alginate-protein composite regions. Following chemical cross-linking of protein molecules and the subsequent removal of the sacrificial alginate from the double-network matrices, microfibers composed only of cross-linked proteins were obtained. We used gelatin, albumin, and hemoglobin as the protein material, and the gelatin-based cell-adhesive fibers were further encapsulated in hydrogels together with the mammalian cells. We clarified that the thinner fibers were especially effective in promoting cell proliferation, and the shape of the constructs was maintained even after removing the hydrogel matrices. The presented approach offers cells with biocompatible solid supports that enhance cell adhesion and proliferation, paving the way for the next generation of techniques for tissue engineering and multicellular organoid formation.
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Affiliation(s)
- Kotone Saeki
- Department of Applied Chemistry and
Biotechnology, Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Hisataka Hiramatsu
- Department of Applied Chemistry and
Biotechnology, Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Ayaka Hori
- Department of Applied Chemistry and
Biotechnology, Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Yu Hirai
- Department of Applied Chemistry and
Biotechnology, Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Masumi Yamada
- Department of Applied Chemistry and
Biotechnology, Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Rie Utoh
- Department of Applied Chemistry and
Biotechnology, Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Minoru Seki
- Department of Applied Chemistry and
Biotechnology, Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
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Palza H, Galarce N, Bejarano J, Beltran M, Caviedes P. Effect of copper nanoparticles on the cell viability of polymer composites. INT J POLYM MATER PO 2017. [DOI: 10.1080/00914037.2016.1252343] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Humberto Palza
- Chemical Engineering and Biotechnology Department, Faculty of Physical and Mathematical Sciences, University of Chile, Santiago, Chile
| | - Natalia Galarce
- Chemical Engineering and Biotechnology Department, Faculty of Physical and Mathematical Sciences, University of Chile, Santiago, Chile
| | - Julian Bejarano
- Chemical Engineering and Biotechnology Department, Faculty of Physical and Mathematical Sciences, University of Chile, Santiago, Chile
| | - Macarena Beltran
- Chemical Engineering and Biotechnology Department, Faculty of Physical and Mathematical Sciences, University of Chile, Santiago, Chile
| | - Pablo Caviedes
- Program of Molecular and Clinical Pharmacology, ICBM, Faculty of Medicine, University of Chile, Santiago, Chile
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Kinoshita K, Iwase M, Yamada M, Yajima Y, Seki M. Fabrication of multilayered vascular tissues using microfluidic agarose hydrogel platforms. Biotechnol J 2016; 11:1415-1423. [DOI: 10.1002/biot.201600083] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 08/17/2016] [Accepted: 08/22/2016] [Indexed: 01/24/2023]
Affiliation(s)
- Keita Kinoshita
- Department of Applied Chemistry and Biotechnology; Graduate School of Engineering; Chiba Japan
| | - Masaki Iwase
- Department of Applied Chemistry and Biotechnology; Graduate School of Engineering; Chiba Japan
| | - Masumi Yamada
- Department of Applied Chemistry and Biotechnology; Graduate School of Engineering; Chiba Japan
| | - Yuya Yajima
- Department of Applied Chemistry and Biotechnology; Graduate School of Engineering; Chiba Japan
| | - Minoru Seki
- Department of Applied Chemistry and Biotechnology; Graduate School of Engineering; Chiba Japan
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Candiello J, Richardson T, Padgaonkar K, Task K, Kumta PN, Banerjee I. Alginate encapsulation of chitosan nanoparticles: a viable alternative to soluble chemical signaling in definitive endoderm induction of human embryonic stem cells. J Mater Chem B 2016; 4:3575-3583. [DOI: 10.1039/c5tb02428e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chitoson nanoparticle augmented encapsulated alginate (CNPEA) induces definitive endoderm (DE) differentiation of human embryonic stem cells without growth factor supplementation.
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Affiliation(s)
- Joseph Candiello
- Department of Bioengineering
- University of Pittsburgh
- Pittsburgh
- USA
| | - Thomas Richardson
- Department of Chemical Engineering
- University of Pittsburgh
- Pittsburgh
- USA
| | - Kimaya Padgaonkar
- Department of Chemical Engineering
- University of Pittsburgh
- Pittsburgh
- USA
| | - Keith Task
- Department of Chemical Engineering
- University of Pittsburgh
- Pittsburgh
- USA
| | - Prashant N. Kumta
- Department of Bioengineering
- University of Pittsburgh
- Pittsburgh
- USA
- Department of Chemical Engineering
| | - Ipsita Banerjee
- Department of Bioengineering
- University of Pittsburgh
- Pittsburgh
- USA
- Department of Chemical Engineering
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Keller L, Wagner Q, Schwinté P, Benkirane-Jessel N. Double compartmented and hybrid implant outfitted with well-organized 3D stem cells for osteochondral regenerative nanomedicine. Nanomedicine (Lond) 2015; 10:2833-45. [PMID: 26377156 DOI: 10.2217/nnm.15.113] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
AIM Articular cartilage repair remains challenging, because most clinical failures are due to the lack of subchondral bone regeneration. We report an innovative approach improving cartilage repair by regenerating a robust subchondral bone, supporting articular cartilage. MATERIALS & METHODS We developed a compartmented living implant containing triple-3D structure: stem cells as microtissues for embryonic endochondral development mimic, nanofibrous collagen to enhance mineralization for subchondral bone and alginate hydrogel for cartilage regeneration. RESULTS & CONCLUSION This system mimics the natural gradient of the osteochondral unit, using only one kind of stem cell, targeting their ability to express specific bone or cartilage proteins. Mineralization gradient of articular cartilage and the natural 'glue' between subchondral bone and cartilage were reproduced in vitro.
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Affiliation(s)
- Laetitia Keller
- INSERM UMR1109, Osteoarticular & Dental Regenerative Nanomedicine, Faculté de Médecine, FMTS, F-67085 Strasbourg, France.,Université de Strasbourg, Faculté de Chirurgie Dentaire, 1 place de l'Hôpital, F-67000 Strasbourg, France
| | - Quentin Wagner
- INSERM UMR1109, Osteoarticular & Dental Regenerative Nanomedicine, Faculté de Médecine, FMTS, F-67085 Strasbourg, France.,Université de Strasbourg, Faculté de Chirurgie Dentaire, 1 place de l'Hôpital, F-67000 Strasbourg, France
| | - Pascale Schwinté
- INSERM UMR1109, Osteoarticular & Dental Regenerative Nanomedicine, Faculté de Médecine, FMTS, F-67085 Strasbourg, France
| | - Nadia Benkirane-Jessel
- INSERM UMR1109, Osteoarticular & Dental Regenerative Nanomedicine, Faculté de Médecine, FMTS, F-67085 Strasbourg, France.,Université de Strasbourg, Faculté de Chirurgie Dentaire, 1 place de l'Hôpital, F-67000 Strasbourg, France
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Angelozzi M, Miotto M, Penolazzi L, Mazzitelli S, Keane T, Badylak SF, Piva R, Nastruzzi C. Composite ECM-alginate microfibers produced by microfluidics as scaffolds with biomineralization potential. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 56:141-53. [PMID: 26249575 DOI: 10.1016/j.msec.2015.06.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 05/05/2015] [Accepted: 06/06/2015] [Indexed: 12/16/2022]
Abstract
A novel approach to produce artificial bone composites (microfibers) with distinctive features mimicking natural tissue was investigated. Currently proposed inorganic materials (e.g. apatite matrixes) lack self-assembly and thereby limit interactions between cells and the material. The present work investigates the feasibility of creating "bio-inspired materials" specifically designed to overcome certain limitations inherent to current biomaterials. We examined the dimensions, morphology, and constitutive features of a composite hydrogel which combined an alginate based microfiber with a gelatin solution or a particulate form of urinary bladder matrix (UBM). The effectiveness of the composite microfibers to induce and modulate osteoblastic differentiation in three-dimensional (3D) scaffolds without altering the viability and morphological characteristics of the cells was investigated. The present study describes a novel alginate microfiber production method with the use of microfluidics. The microfluidic procedure allowed for precise tuning of microfibers which resulted in enhanced viability and function of embedded cells.
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Affiliation(s)
- Marco Angelozzi
- Department of Biomedical and Specialty Surgical Sciences, University of Ferrara, Ferrara, Italy
| | - Martina Miotto
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy
| | - Letizia Penolazzi
- Department of Biomedical and Specialty Surgical Sciences, University of Ferrara, Ferrara, Italy
| | - Stefania Mazzitelli
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy
| | - Timothy Keane
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Stephen F Badylak
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - Roberta Piva
- Department of Biomedical and Specialty Surgical Sciences, University of Ferrara, Ferrara, Italy
| | - Claudio Nastruzzi
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy
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Kitagawa Y, Naganuma Y, Yajima Y, Yamada M, Seki M. Patterned hydrogel microfibers prepared using multilayered microfluidic devices for guiding network formation of neural cells. Biofabrication 2014; 6:035011. [DOI: 10.1088/1758-5082/6/3/035011] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Malagón-Romero D, Hernández N, Cardozo C, Godoy-Silva RD. Rheological characterization of a gel produced using human blood plasma and alginate mixtures. J Mech Behav Biomed Mater 2014; 34:171-80. [PMID: 24603213 DOI: 10.1016/j.jmbbm.2014.02.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2013] [Revised: 02/04/2014] [Accepted: 02/05/2014] [Indexed: 01/11/2023]
Abstract
Human blood plasma is a material used to generate tissue equivalents due to presence of fibrinogen. However, gels formed using human blood plasma has weak mechanical properties. In this study, different mixtures of sodium alginate and blood plasma were performed and evaluated. By determining ζ potential can be established the stability of the plasma-alginate mixture and by dynamic rheology can determine the most suitable parameters for the gelation of the above mixtures, when calcium chloride is used as a crosslinker. Experimental results evidence an increment in ζ potential at alginate concentrations of 0.8% and 1.6% with a resulting pseudoplastic behavior of evaluated mixtures, which described the homogenization of the mixture. On the other hand, mixtures were gelled by using aspersion of calcium chloride and characterized by dynamic rheology. Solid behavior is dominant in all range of frequency sweep test between 0.1Hz and 100Hz. Finally, the ultimate tensile strength of a gel reach 6.36938±0.24320kPa, which is enough for manual handling of the gel. Between the tasks of the gel would be used for cell entrapment, for controlled release of drugs or in the manufacture of wound dressings.
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Affiliation(s)
- Dionisio Malagón-Romero
- Universidad Nacional de Colombia, Bogotá, Colombia; Universidad Santo Tomás, Bogotá, Colombia.
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Lin HY, Peng CW, Wu WW. Fibrous hydrogel scaffolds with cells embedded in the fibers as a potential tissue scaffold for skin repair. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2014; 25:259-269. [PMID: 24101186 DOI: 10.1007/s10856-013-5065-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Accepted: 09/28/2013] [Indexed: 06/02/2023]
Abstract
A novel approach was undertaken to create a potential skin wound dressing. L929 fibroblast cells and alginate solution were simultaneously dispensed into a calcium chloride solution using a three-dimensional plotting system to manufacture a fibrous alginate scaffold with interconnected pores. These cells were then embedded in the alginate hydrogel fibers of the scaffold. A conventional scaffold with cells directly seeded on the fiber surface was used as a control. The encapsulated fibroblasts made using the co-dispensing method distributed homogeneously within the scaffold and showed the delayed formation of large cell aggregates compared to the control. The cells embedded in the hydrogel fibers also deposited more type I collagen in the extracellular matrix and expressed higher levels of fgf11 and fn1 than the control, indicating increased cellular proliferation and attachment. The results indicate that the novel co-dispensing alginate scaffold may promote skin regeneration better than the conventional directly-seeded scaffold.
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Affiliation(s)
- Hsin-Yi Lin
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, 1, Sec 3, Zhongxiao E. Rd., Taipei, 106, Taiwan,
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11
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Candiello J, Singh SS, Task K, Kumta PN, Banerjee I. Early differentiation patterning of mouse embryonic stem cells in response to variations in alginate substrate stiffness. J Biol Eng 2013; 7:9. [PMID: 23570553 PMCID: PMC3643844 DOI: 10.1186/1754-1611-7-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Accepted: 03/20/2013] [Indexed: 01/05/2023] Open
Abstract
Background Embryonic stem cells (ESCs) have been implicated to have tremendous impact in regenerative therapeutics of various diseases, including Type 1 Diabetes. Upon generation of functionally mature ESC derived islet-like cells, they need to be implanted into diabetic patients to restore the loss of islet activity. Encapsulation in alginate microcapsules is a promising route of implantation, which can protect the cells from the recipient’s immune system. While there has been a significant investigation into islet encapsulation over the past decade, the feasibility of encapsulation and differentiation of ESCs has been less explored. Research over the past few years has identified the cellular mechanical microenvironment to play a central role in phenotype commitment of stem cells. Therefore it will be important to design the encapsulation material to be supportive to cellular functionality and maturation. Results This work investigated the effect of stiffness of alginate substrate on initial differentiation and phenotype commitment of murine ESCs. ESCs grown on alginate substrates tuned to similar biomechanical properties of native pancreatic tissue elicited both an enhanced and incrementally responsive differentiation towards endodermal lineage traits. Conclusions The insight into these biophysical phenomena found in this study can be used along with other cues to enhance the differentiation of embryonic stem cells toward a specific lineage fate.
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Affiliation(s)
- Joseph Candiello
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA.
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Miyama A, Yamada M, Sugaya S, Seki M. A droplet-based microfluidic process to produce yarn-ball-shaped hydrogel microbeads. RSC Adv 2013. [DOI: 10.1039/c3ra41747f] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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Leng L, McAllister A, Zhang B, Radisic M, Günther A. Mosaic hydrogels: one-step formation of multiscale soft materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:3650-8. [PMID: 22714644 DOI: 10.1002/adma.201201442] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Revised: 05/10/2012] [Indexed: 06/01/2023]
Abstract
The one-step, continuous formation of mosaic hydrogel sheets is presented. A microfluidic device allows controllable incorporation of secondary biopolymers within a flowing biopolymer sheet followed by a cross-linking step that retains the microscale composition. Information is encoded; mosaic stiffness and diffusivity patterns are created; tessellations are populated with biomolecules, microparticles and viable primary cells; and 3D soft material assemblies are demonstrated.
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Affiliation(s)
- Lian Leng
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario, M5S3G8, Canada
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Huang X, Zhang X, Wang X, Wang C, Tang B. Microenvironment of alginate-based microcapsules for cell culture and tissue engineering. J Biosci Bioeng 2012; 114:1-8. [PMID: 22561878 DOI: 10.1016/j.jbiosc.2012.02.024] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Revised: 02/14/2012] [Accepted: 02/23/2012] [Indexed: 02/07/2023]
Abstract
As a type of 3D model, the technology of microencapsulation holds significant promise for tissue engineering and cell therapy due to its unique performance. The microenvironmental factors within microcapsules play an important role in influencing the behaviors of encapsulated cells. The aim of this review article is to give an overview on the construction of the microenvironmental factors, which include 3D space, physicochemical properties of alginate matrix, cell spheroids, nutritional status, and so on. Furthermore, we clarified the effect of microenvironmental factors on the behaviors of encapsulated cells and the methods about improving the microenvironment of microcapsules. This review will help to understand the interaction of the microenvironment and the encapsulated cells and lay a solid foundation for microcapsule-based cell therapy and tissue engineering.
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Affiliation(s)
- Xiaobo Huang
- Institute of Surface Engineering, Taiyuan University of Technology, 79 Yingze Road, Taiyuan 030024, PR China.
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15
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Chung CW, Kang JY, Yoon IS, Hwang HD, Balakrishnan P, Cho HJ, Chung KD, Kang DH, Kim DD. Interpenetrating polymer network (IPN) scaffolds of sodium hyaluronate and sodium alginate for chondrocyte culture. Colloids Surf B Biointerfaces 2011; 88:711-6. [DOI: 10.1016/j.colsurfb.2011.08.005] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2011] [Revised: 08/08/2011] [Accepted: 08/08/2011] [Indexed: 11/27/2022]
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Gattás-Asfura KM, Fraker CA, Stabler CL. Covalent stabilization of alginate hydrogel beads via Staudinger ligation: assessment of poly(ethylene glycol) and alginate cross-linkers. J Biomed Mater Res A 2011; 99:47-57. [PMID: 21793196 DOI: 10.1002/jbm.a.33162] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2011] [Revised: 05/02/2011] [Accepted: 05/05/2011] [Indexed: 11/10/2022]
Abstract
Cellular encapsulation within alginate hydrogel capsules has broad applications in tissue engineering. In seeking to improve the inherent instability of ionically cross-linked alginate hydrogels, we previously demonstrated the covalent stabilization of Ba(2+) cross-linked alginate-azide beads via chemoselective Staudinger ligation using a 1-methyl-2-diphenylphosphino-terephthalate (MDT) terminated poly(ethylene glycol) (PEG) linker. In this study, we functionalized variant PEG, linear and branched, and alginate polymers with MDT groups to evaluate the effect of size, structural design, number of functional groups, and charge on the resulting hydrogel bead. All cross-linkers resulted in enhanced covalent stabilization of alginate beads, with significant decreases in swelling and resistance to dissolution via Ba(2+) chelation. The MDT-functionalized alginate resulted in the most stable and homogeneous bead, with the most restrictive permeability even after EDTA exposure. Co-encapsulation of MIN6 cells within the cross-linked alginate hydrogel beads resulted in minimal effects on viability, whereas the degree of proliferation following culture varied with cross-linker type. Altogether, the results illustrate that manipulating the cross-linker structural design permits flexibility in resulting alginate beads characteristics. Covalent stabilization of alginate hydrogel beads with these chemoselective alginate and PEG-based cross-linkers provides a unique platform for cellular encapsulation.
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Affiliation(s)
- Kerim M Gattás-Asfura
- Diabetes Research Institute, Leonard M. Miller School of Medicine, University of Miami, Miami, Florida 33136, USA
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Ulery BD, Nair LS, Laurencin CT. Biomedical Applications of Biodegradable Polymers. JOURNAL OF POLYMER SCIENCE. PART B, POLYMER PHYSICS 2011; 49:832-864. [PMID: 21769165 PMCID: PMC3136871 DOI: 10.1002/polb.22259] [Citation(s) in RCA: 1179] [Impact Index Per Article: 90.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Utilization of polymers as biomaterials has greatly impacted the advancement of modern medicine. Specifically, polymeric biomaterials that are biodegradable provide the significant advantage of being able to be broken down and removed after they have served their function. Applications are wide ranging with degradable polymers being used clinically as surgical sutures and implants. In order to fit functional demand, materials with desired physical, chemical, biological, biomechanical and degradation properties must be selected. Fortunately, a wide range of natural and synthetic degradable polymers has been investigated for biomedical applications with novel materials constantly being developed to meet new challenges. This review summarizes the most recent advances in the field over the past 4 years, specifically highlighting new and interesting discoveries in tissue engineering and drug delivery applications.
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Affiliation(s)
- Bret D. Ulery
- Department of Orthopaedic Surgery, New England Musculoskeletal Institute, University of Connecticut Health Center, Farmington, Connecticut 06030
- Institute of Regenerative Engineering, University of Connecticut Health Center, Farmington, Connecticut 06030
| | - Lakshmi S. Nair
- Department of Orthopaedic Surgery, New England Musculoskeletal Institute, University of Connecticut Health Center, Farmington, Connecticut 06030
- Institute of Regenerative Engineering, University of Connecticut Health Center, Farmington, Connecticut 06030
- Department of Chemical, Materials & Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06268
| | - Cato T. Laurencin
- Department of Orthopaedic Surgery, New England Musculoskeletal Institute, University of Connecticut Health Center, Farmington, Connecticut 06030
- Institute of Regenerative Engineering, University of Connecticut Health Center, Farmington, Connecticut 06030
- Department of Chemical, Materials & Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06268
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18
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Lin HY, Ciou SY. Modifications of alginate-based scaffolds and characterizations of their pentoxifylline release properties. Carbohydr Polym 2010. [DOI: 10.1016/j.carbpol.2009.11.044] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Hang H, Shi X, Gu GX, Wu Y, Gu J, Ding Y. In vitro analysis of cryopreserved alginate-poly-L-lysine-alginate-microencapsulated human hepatocytes. Liver Int 2010; 30:611-22. [PMID: 20070514 DOI: 10.1111/j.1478-3231.2009.02197.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
BACKGROUND The availability of well-characterized human hepatocytes that can be frozen and thawed will be critical for cell therapy. We addressed whether human hepatocytes can recover after microencapsulated cryopreservation and investigated whether these cryopreserved microencapsulated hepatocytes can be used for clinical applications. METHODS Adult hepatocytes of 18 separate donors were isolated with a two-step extracorporeal collagenase perfusion technique. After pre-incubation at 4 degrees C for 12-24 h in HepatoZYME-SFM, hepatocytes were microencapsulated using alginate-poly-L-lysine-alginate microcapsules. The microencapsulated hepatocytes were transferred to a complete medium containing 10% dimethyl sulphoxide. They were immediately placed into an isopropanol progressive freezing container at -80 degrees C overnight and immersed in liquid nitrogen the next day. During the post-thawing culture period, albumin secretion, urea synthesis, cell cycle, mRNA and protein levels, as well as the morphology and pathology structure of pre-incubation before microencapsulated cryopreservation (PMC) groups were analysed. RESULTS Compared with the immediate cryopreservation (IC) groups, we found significant improvement in the mRNA and protein levels in the attached cells, and higher secretion of albumin and urea levels after thawing. In the attached cultured human cryopreserved/thawed hepatocytes from the PMC group, albumin production was not significantly different from those of the direct culture groups on days 2, 3 and 4. The preserved morphology in the PMC group compared with the IC group was obvious. CONCLUSIONS The results of the present study suggested recovery of the functional and morphological integrity of human hepatocytes after pre-incubation at 4 degrees C for 12-24 h before microencapsulated cryopreservation. These studies offer the possibility for clinical applications in pharmacotoxicology, bioartificial liver and cell therapy in humans.
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Affiliation(s)
- Hualian Hang
- Department of Hepatobiliary Surgery, Affiliated Drum Tower Hospital, Medical College of Nanjing University, Jiangsu Province's Key Medical Center for Hepatobiliary Disease, Nanjing, China
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