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Donati I, Christensen BE. Alginate-metal cation interactions: Macromolecular approach. Carbohydr Polym 2023; 321:121280. [PMID: 37739522 DOI: 10.1016/j.carbpol.2023.121280] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 07/21/2023] [Accepted: 08/08/2023] [Indexed: 09/24/2023]
Abstract
Alginates are a broad family of linear (unbranched) polysaccharides derived from brown seaweeds and some bacteria. Despite having only two monomers, i.e. β-d-mannuronate (M) and its C5 epimer α-l-guluronate (G), their blockwise arrangement in oligomannuronate (..MMM..), oligoguluronate (..GGG..), and polyalternating (..MGMG..) blocks endows it with a rather complex interaction pattern with specific counterions and salts. Classic polyelectrolyte theories well apply to alginate as polyanion in the interaction with monovalent and non-gelling divalent cations. The use of divalent gelling ions, such as Ca2+, Ba2+ or Sr2+, provides thermostable homogeneous or heterogeneous hydrogels where the block composition affects both macroscopic and microscopic properties. The mechanism of alginate gelation is still explained in terms of the original egg-box model, although over the years some novel insights have been proposed. In this review we summarize several decades of research related to structure-functionships in alginates in the presence of non-gelling and gelling cations and present some novel applications in the field of self-assembling nanoparticles and use of radionuclides.
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Affiliation(s)
- Ivan Donati
- Department of Life Sciences, University of Trieste, Via Licio Giorgieri 5, 34127 Trieste, Italy
| | - Bjørn E Christensen
- Norwegian Biopolymer Laboratory (NOBIPOL), Department of Biotechnology and Food Science, NTNU Norwegian University of Science and Technology, Sem Sælands vei 6/8, 7491 Trondheim, Norway.
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2
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Yamamoto T. Relationship between Rate-Limiting Process and Scaling Law in Gel Growth Induced by Liquid-Liquid Contact. Gels 2023; 9:gels9050359. [PMID: 37232951 DOI: 10.3390/gels9050359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Revised: 04/15/2023] [Accepted: 04/19/2023] [Indexed: 05/27/2023] Open
Abstract
Gelation through the liquid-liquid contact between a polymer solution and a gelator solution has been attempted with various combinations of gelator and polymer solutions. In many combinations, the gel growth dynamics is expressed as X∼t, where X is the gel thickness and t is the elapsed time, and the scaling law holds for the relationship between X and t. In the blood plasma gelation, however, the crossover of the growth behavior from X∼t in the early stage to X∼t in the late stage was observed. It was found that the crossover behavior is caused by a change in the rate-limiting process of growth from the free-energy-limited process to the diffusion-limited process. How, then, would the crossover phenomenon be described in terms of the scaling law? We found that the scaling law does not hold in the early stage owing to the characteristic length attributable to the free energy difference between the sol-gel phases, but it does in the late stage. We also discussed the analysis method for the crossover in terms of the scaling law.
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Affiliation(s)
- Takao Yamamoto
- Division of Pure and Applied Science, Graduate School of Science and Technology, Gunma University, Kiryu 376-8515, Japan
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3
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Nützl M, Schrottenbaum M, Müller T, Müller R. Mechanical properties and chemical stability of alginate-based anisotropic capillary hydrogels. J Mech Behav Biomed Mater 2022; 134:105397. [DOI: 10.1016/j.jmbbm.2022.105397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 07/08/2022] [Accepted: 07/19/2022] [Indexed: 10/16/2022]
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4
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Xue W, Shi W, Kong Y, Kuss M, Duan B. Anisotropic scaffolds for peripheral nerve and spinal cord regeneration. Bioact Mater 2021; 6:4141-4160. [PMID: 33997498 PMCID: PMC8099454 DOI: 10.1016/j.bioactmat.2021.04.019] [Citation(s) in RCA: 62] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 04/05/2021] [Accepted: 04/13/2021] [Indexed: 12/12/2022] Open
Abstract
The treatment of long-gap (>10 mm) peripheral nerve injury (PNI) and spinal cord injury (SCI) remains a continuous challenge due to limited native tissue regeneration capabilities. The current clinical strategy of using autografts for PNI suffers from a source shortage, while the pharmacological treatment for SCI presents dissatisfactory results. Tissue engineering, as an alternative, is a promising approach for regenerating peripheral nerves and spinal cords. Through providing a beneficial environment, a scaffold is the primary element in tissue engineering. In particular, scaffolds with anisotropic structures resembling the native extracellular matrix (ECM) can effectively guide neural outgrowth and reconnection. In this review, the anatomy of peripheral nerves and spinal cords, as well as current clinical treatments for PNI and SCI, is first summarized. An overview of the critical components in peripheral nerve and spinal cord tissue engineering and the current status of regeneration approaches are also discussed. Recent advances in the fabrication of anisotropic surface patterns, aligned fibrous substrates, and 3D hydrogel scaffolds, as well as their in vitro and in vivo effects are highlighted. Finally, we summarize potential mechanisms underlying the anisotropic architectures in orienting axonal and glial cell growth, along with their challenges and prospects.
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Affiliation(s)
- Wen Xue
- Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE, USA
- Division of Cardiology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, USA
| | - Wen Shi
- Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE, USA
- Division of Cardiology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, USA
| | - Yunfan Kong
- Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE, USA
- Division of Cardiology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, USA
| | - Mitchell Kuss
- Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE, USA
- Division of Cardiology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, USA
| | - Bin Duan
- Mary & Dick Holland Regenerative Medicine Program, University of Nebraska Medical Center, Omaha, NE, USA
- Division of Cardiology, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE, USA
- Department of Surgery, University of Nebraska Medical Center, Omaha, NE, USA
- Department of Mechanical Engineering, University of Nebraska-Lincoln, Lincoln, NE, USA
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5
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Yonemoto J, Maki Y, Koh I, Furusawa K, Annaka M. Formation of Multi-Channel Collagen Gels Investigated Using Particle Tracking Microrheology. Biomacromolecules 2021; 22:3819-3826. [PMID: 34343432 DOI: 10.1021/acs.biomac.1c00666] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Collagen is one of the most common materials used to form scaffolds for tissue engineering applications. The multi-channel collagen gel (MCCG) obtained by the dialysis of an acidic collagen solution in a neutral buffer solution has a unique structure, with many capillaries of diameters several tens to a few hundred micrometers, and could be a potential candidate as a biomimetic scaffold for three-dimensional tissue engineering. In the present study, the formation of MCCG was investigated by in situ rheological measurements based on a particle tracking method (particle tracking microrheology, PTM). PTM enabled us to measure changes in the rheological properties of collagen solutions under the continuous exchange of substances during dialysis. When an observation plane was set perpendicular to the direction of gel growth, we first observed convectional flow of the collagen solution, followed by phase separation and gelation. We showed that the structure of the MCCG originated from the transient structure formed during the initial stage of viscoelastic phase separation and was fixed by the subsequent gelation.
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Affiliation(s)
- Junta Yonemoto
- Graduate School of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, Fukuoka 819-0395, Japan
| | - Yasuyuki Maki
- Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, Fukuoka 819-0395, Japan
| | - Isabel Koh
- RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Kazuya Furusawa
- Department of Environmental and Food Sciences, Fukui University of Technology, Gakuen 3-6-1, Fukui, Fukui 910-8505, Japan
| | - Masahiko Annaka
- Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, Fukuoka 819-0395, Japan
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6
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Adibnia V, Mirbagheri M, Latreille PL, Faivre J, Cécyre B, Robert J, Bouchard JF, Martinez VA, Delair T, David L, Hwang DK, Banquy X. Chitosan hydrogel micro-bio-devices with complex capillary patterns via reactive-diffusive self-assembly. Acta Biomater 2019; 99:211-219. [PMID: 31473363 DOI: 10.1016/j.actbio.2019.08.037] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 08/19/2019] [Accepted: 08/21/2019] [Indexed: 02/07/2023]
Abstract
We present chitosan hydrogel microfluidic devices with self-assembled complex microcapillary patterns, conveniently formed by a diffusion-reaction process. These patterns in chitosan hydrogels are formed by a single-step procedure involving diffusion of a gelation agent into the polymer solution inside a microfluidic channel. By changing the channel geometry, it is demonstrated how to control capillary length, trajectory and branching. Diffusion of nanoparticles (NPs) in the capillary network is used as a model to effectively mimic the transport of nano-objects in vascularized tissues. Gold NPs diffusion is measured locally in the hydrogel chips, and during their two-step transport through the capillaries to the gel matrix and eventually to embedded cell clusters in the gel. In addition, the quantitative analyses reported in this study provide novel opportunities for theoretical investigation of capillary formation and propagation during diffusive gelation of biopolymers. STATEMENT OF SIGNIFICANCE: Hydrogel micropatterning is a challenging task, which is of interest in several biomedical applications. Creating the patterns through self assembly is highly beneficial, because of the accessible and practical preparation procedure. In this study, we introduced complex self-assembled capillary patterns in chitosan hydrogels using a microfluidic approach. To demonstrate the potential application of these capillary patterns, a vascularized hydrogel with microwells occupied by cells was produced, and the diffusion of gold nanoparticles travelling in the capillaries and diffusing in the gel were evaluated. This model mimics a simplified biological tissue, where nanomedicine has to travel through the vasculature, extravasate into and diffuse through the extracellular matrix and eventually reach targeted cells.
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7
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Canadas RF, Ren T, Tocchio A, Marques AP, Oliveira JM, Reis RL, Demirci U. Tunable anisotropic networks for 3-D oriented neural tissue models. Biomaterials 2018; 181:402-414. [DOI: 10.1016/j.biomaterials.2018.07.055] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2018] [Revised: 07/24/2018] [Accepted: 07/28/2018] [Indexed: 02/06/2023]
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8
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Dobashi T, Yamamoto T. Analysis of Heterogeneous Gelation Dynamics and Their Application to Blood Coagulation. Gels 2018; 4:E59. [PMID: 30674835 PMCID: PMC6209283 DOI: 10.3390/gels4030059] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Revised: 07/03/2018] [Accepted: 07/05/2018] [Indexed: 01/03/2023] Open
Abstract
We present a scaling model based on a moving boundary picture to describe heterogeneous gelation dynamics. The dynamics of gelation induced by different gelation mechanisms is expressed by the scaled equation for the time taken for development of the gel layer with a few kinetic coefficients characterizing the system. The physical meaning obtained by the analysis for a simple boundary condition from the standpoint of the phase transition shows that the time development of the gelation layer depends on whether the dynamics of the order parameter expressing the gelation of the polymer solution is fast or slow compared with the diffusion of the gelators in the heterogeneous gelation. The analytical method is used to understand the coagulation of blood from various animals. An experiment using systems with plasma coagulation occurring at interfaces with calcium chloride solution and with packed erythrocytes is performed to provide the data for model fitting and it is clarified that a few key kinetic coefficients in plasma coagulation can be estimated from the analysis of gelation dynamics.
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Affiliation(s)
- Toshiaki Dobashi
- Division of Molecular Science, Graduate School of Science and Technology, Gunma University, Kiryu, Gunma 376-8515, Japan.
| | - Takao Yamamoto
- Division of Pure and Applied Science, Graduate School of Science and Technology, Gunma University, Kiryu, Gunma 376-8515, Japan.
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9
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Maki Y, Furusawa K, Yamamoto T, Dobashi T. Structure formation in biopolymer gels induced by diffusion of gelling factors. ACTA ACUST UNITED AC 2018. [DOI: 10.17106/jbr.32.27] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Yasuyuki Maki
- Department of Chemistry, Faculty of Science, Kyushu University
| | | | - Takao Yamamoto
- Division of Molecular Science, Graduate School of Science and Technology, Gunma University
| | - Toshiaki Dobashi
- Division of Molecular Science, Graduate School of Science and Technology, Gunma University
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10
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Sereni N, Enache A, Sudre G, Montembault A, Rochas C, Durand P, Perrard MH, Bozga G, Puaux JP, Delair T, David L. Dynamic Structuration of Physical Chitosan Hydrogels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:12697-12707. [PMID: 29019693 DOI: 10.1021/acs.langmuir.7b02997] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We studied the microstructure of physical chitosan hydrogels formed by the neutralization of chitosan aqueous solutions highlighting the structural gradients within thick gels (up to a thickness of 16 mm). We explored a high polymer concentrations range (Cp ≥ 1.0% w/w) with different molar masses of chitosan and different concentrations of the coagulation agent. The effect of these processing parameters on the morphology was evaluated mainly through small-angle light scattering (SALS) measurements and confocal laser scanning microscopy (CLSM) observations. As a result, we reported that the microstructure is continuously evolving from the surface to the bulk, with mainly two structural transitions zones separating three types of hydrogels. The first zone (zone I) is located close to the surface of the hydrogel and constitutes a hard (entangled) layer formed under fast neutralization conditions. It is followed by a second zone (zone II) with a larger thickness (∼3-4 mm), where in some cases large pores or capillaries (diameter ∼10 μm) oriented parallel to the direction of the gel front are present. Deeper in the hydrogel (zone III), a finer oriented microstructure, with characteristic sizes lower than 2-3 μm, gradually replace the capillary morphology. However, this last bulk morphology cannot be regarded as structurally uniform because the size of small micrometer-range-oriented pores continuously increases as the distance to the surface of the hydrogel increases. These results could be rationalized through the effect of coagulation kinetics impacting the morphology obtained during neutralization.
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Affiliation(s)
- Nicolas Sereni
- Université de Lyon, Université Claude Bernard Lyon 1 , CNRS UMR 5223 Ingénierie des Matériaux Polymères IMP@Lyon1, 15 bd Latarjet, 69622 Villeurbanne Cedex, France
| | - Alin Enache
- Centre for Technology Transfer in the Process Industries, Department of Chemical Engineering, University POLITEHNICA of Bucharest , 1 Polizu Street, RO-011061 Bucharest, Romania
| | - Guillaume Sudre
- Université de Lyon, Université Claude Bernard Lyon 1 , CNRS UMR 5223 Ingénierie des Matériaux Polymères IMP@Lyon1, 15 bd Latarjet, 69622 Villeurbanne Cedex, France
| | - Alexandra Montembault
- Université de Lyon, Université Claude Bernard Lyon 1 , CNRS UMR 5223 Ingénierie des Matériaux Polymères IMP@Lyon1, 15 bd Latarjet, 69622 Villeurbanne Cedex, France
| | - Cyrille Rochas
- Université de Grenoble, Université Joseph Fourier , CERMAV-CNRS UPR5301 Centre de Recherches sur les Macromolécules Végétales, Boîte Postale 53, F-38041 Grenoble Cedex, France
| | - Philippe Durand
- Kallistem, Ecole Normale Supérieure de Lyon , 46 Allée d'Italie, 69364 Lyon Cedex 07, France
| | - Marie-Hélène Perrard
- Kallistem, Ecole Normale Supérieure de Lyon , 46 Allée d'Italie, 69364 Lyon Cedex 07, France
| | - Grigore Bozga
- Centre for Technology Transfer in the Process Industries, Department of Chemical Engineering, University POLITEHNICA of Bucharest , 1 Polizu Street, RO-011061 Bucharest, Romania
| | - Jean-Pierre Puaux
- Université de Lyon, Université Claude Bernard Lyon 1 , CNRS UMR 5223 Ingénierie des Matériaux Polymères IMP@Lyon1, 15 bd Latarjet, 69622 Villeurbanne Cedex, France
| | - Thierry Delair
- Université de Lyon, Université Claude Bernard Lyon 1 , CNRS UMR 5223 Ingénierie des Matériaux Polymères IMP@Lyon1, 15 bd Latarjet, 69622 Villeurbanne Cedex, France
| | - Laurent David
- Université de Lyon, Université Claude Bernard Lyon 1 , CNRS UMR 5223 Ingénierie des Matériaux Polymères IMP@Lyon1, 15 bd Latarjet, 69622 Villeurbanne Cedex, France
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11
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Armstrong JPK, Burke M, Carter BM, Davis SA, Perriman AW. 3D Bioprinting Using a Templated Porous Bioink. Adv Healthc Mater 2016; 5:1724-30. [PMID: 27125336 DOI: 10.1002/adhm.201600022] [Citation(s) in RCA: 106] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Revised: 02/29/2016] [Indexed: 02/05/2023]
Abstract
3D tissue printing with adult stem cells is reported. A novel cell-containing multicomponent bioink is used in a two-step 3D printing process to engineer bone and cartilage architectures.
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Affiliation(s)
| | - Madeline Burke
- School of Cellular and Molecular Medicine University of Bristol Bristol BS8 1TD UK
- Centre for Organized Matter Chemistry and Centre for Protolife Research School of Chemistry University of Bristol Bristol BS8 1TS UK
- Bristol Centre for Functional Nanomaterials University of Bristol Bristol BS8 1FD UK
| | - Benjamin M. Carter
- School of Cellular and Molecular Medicine University of Bristol Bristol BS8 1TD UK
| | - Sean A. Davis
- Centre for Organized Matter Chemistry and Centre for Protolife Research School of Chemistry University of Bristol Bristol BS8 1TS UK
| | - Adam W. Perriman
- School of Cellular and Molecular Medicine University of Bristol Bristol BS8 1TD UK
- Centre for Organized Matter Chemistry and Centre for Protolife Research School of Chemistry University of Bristol Bristol BS8 1TS UK
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12
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Modeling capillary formation in calcium and copper alginate gels. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 58:442-9. [DOI: 10.1016/j.msec.2015.08.040] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 08/05/2015] [Accepted: 08/22/2015] [Indexed: 11/15/2022]
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13
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Furusawa K, Mizutani T, Machino H, Yahata S, Fukui A, Sasaki N. Application of Multichannel Collagen Gels in Construction of Epithelial Lumen-like Engineered Tissues. ACS Biomater Sci Eng 2015; 1:539-548. [DOI: 10.1021/acsbiomaterials.5b00003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kazuya Furusawa
- Faculty of Advanced Life Science, and ‡Division of Biological Sciences
(Macromolecular Functions), School of Science, Hokkaido University, Kita-ku Kita 10 Nishi 8, Sapporo, Hokkaido Japan
| | - Takeomi Mizutani
- Faculty of Advanced Life Science, and ‡Division of Biological Sciences
(Macromolecular Functions), School of Science, Hokkaido University, Kita-ku Kita 10 Nishi 8, Sapporo, Hokkaido Japan
| | - Hiromi Machino
- Faculty of Advanced Life Science, and ‡Division of Biological Sciences
(Macromolecular Functions), School of Science, Hokkaido University, Kita-ku Kita 10 Nishi 8, Sapporo, Hokkaido Japan
| | - Saki Yahata
- Faculty of Advanced Life Science, and ‡Division of Biological Sciences
(Macromolecular Functions), School of Science, Hokkaido University, Kita-ku Kita 10 Nishi 8, Sapporo, Hokkaido Japan
| | - Akimasa Fukui
- Faculty of Advanced Life Science, and ‡Division of Biological Sciences
(Macromolecular Functions), School of Science, Hokkaido University, Kita-ku Kita 10 Nishi 8, Sapporo, Hokkaido Japan
| | - Naoki Sasaki
- Faculty of Advanced Life Science, and ‡Division of Biological Sciences
(Macromolecular Functions), School of Science, Hokkaido University, Kita-ku Kita 10 Nishi 8, Sapporo, Hokkaido Japan
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14
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Schuster E, Eckardt J, Hermansson AM, Larsson A, Lorén N, Altskär A, Ström A. Microstructural, mechanical and mass transport properties of isotropic and capillary alginate gels. SOFT MATTER 2014; 10:357-66. [PMID: 24652276 DOI: 10.1039/c3sm52285g] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Macroscopically homogeneous and inhomogeneous calcium alginate gels are formed via internal or external addition of various amounts of calcium to an alginate solution. The externally formed gels contain parallel aligned capillary structures. The mechanical and mass transport properties and the microstructure of the differently set gels were characterized by rheological measurements, fluorescence recovery after photobleaching (FRAP) and transmission electron microscopy (TEM). TEM images show a zone of distorted anisotropic gel structure in the vicinity of the capillaries as well as indications of a lower degree of void connectivity. The diffusion rates of dextran at large distances from the capillaries were fast and capillary gels showed a plastic behaviour in comparison to the internally set gels. The results presented show large functional differences between the internally and externally set gels, which cannot be explained by the presence of capillaries alone.
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Affiliation(s)
- Erich Schuster
- Department of Structure and Material Design, The Swedish Institute for Food and Biotechnology, SIK, Göteborg, Sweden
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15
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Della Rocca DG, Willenberg BJ, Ferreira LF, Wate PS, Petersen JW, Handberg EM, Zheng T, Steindler DA, Terada N, Batich CD, Byrne BJ, Pepine CJ. A degradable, bioactive, gelatinized alginate hydrogel to improve stem cell/growth factor delivery and facilitate healing after myocardial infarction. Med Hypotheses 2012; 79:673-7. [PMID: 22939314 DOI: 10.1016/j.mehy.2012.08.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Accepted: 08/06/2012] [Indexed: 12/22/2022]
Abstract
Despite remarkable effectiveness of reperfusion and drug therapies to reduce morbidity and mortality following myocardial infarction (MI), many patients have debilitating symptoms and impaired left ventricular (LV) function highlighting the need for improved post-MI therapies. A promising concept currently under investigation is intramyocardial injection of high-water content, polymeric biomaterial gels (e.g., hydrogels) to modulate myocardial scar formation and LV adverse remodeling. We propose a degradable, bioactive hydrogel that forms a unique microstructure of continuous, parallel capillary-like channels (Capgel). We hypothesize that the innovative architecture and composition of Capgel can serve as a platform for endogenous cell recruitment and drug/cell delivery, therefore facilitating myocardial repair after MI.
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16
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The fundamental role of subcellular topography in peripheral nerve repair therapies. Biomaterials 2012; 33:4264-76. [DOI: 10.1016/j.biomaterials.2012.02.043] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2012] [Accepted: 02/24/2012] [Indexed: 12/17/2022]
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17
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Furusawa K, Sato S, Masumoto JI, Hanazaki Y, Maki Y, Dobashi T, Yamamoto T, Fukui A, Sasaki N. Studies on the Formation Mechanism and the Structure of the Anisotropic Collagen Gel Prepared by Dialysis-Induced Anisotropic Gelation. Biomacromolecules 2011; 13:29-39. [DOI: 10.1021/bm200869p] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Kazuya Furusawa
- Faculty of Advanced Life Science, Hokkaido University, Kita-ku Kita 10 Nishi 8, Sapporo,
Hokkaido, Japan
| | - Shoichi Sato
- Transdisciplinary
Life Science
Course, Graduate School of Life Science, Hokkaido University, Kita-ku Kita 10 Nishi 8, Sapporo, Hokkaido, Japan
| | - Jyun-ichi Masumoto
- Transdisciplinary
Life Science
Course, Graduate School of Life Science, Hokkaido University, Kita-ku Kita 10 Nishi 8, Sapporo, Hokkaido, Japan
| | - Yohei Hanazaki
- Transdisciplinary
Life Science
Course, Graduate School of Life Science, Hokkaido University, Kita-ku Kita 10 Nishi 8, Sapporo, Hokkaido, Japan
| | - Yasuyuki Maki
- Department of Chemistry
and Chemical Biology, Graduate School of Engineering, Gunma University, Tenjincho 1-5-1, Kiryu, Gunma, Japan
| | - Toshiaki Dobashi
- Department of Chemistry
and Chemical Biology, Graduate School of Engineering, Gunma University, Tenjincho 1-5-1, Kiryu, Gunma, Japan
| | - Takao Yamamoto
- Department of Chemistry
and Chemical Biology, Graduate School of Engineering, Gunma University, Tenjincho 1-5-1, Kiryu, Gunma, Japan
| | - Akimasa Fukui
- Faculty of Advanced Life Science, Hokkaido University, Kita-ku Kita 10 Nishi 8, Sapporo,
Hokkaido, Japan
| | - Naoki Sasaki
- Faculty of Advanced Life Science, Hokkaido University, Kita-ku Kita 10 Nishi 8, Sapporo,
Hokkaido, Japan
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18
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Maneval JE, Bernin D, Fabich HT, Seymour JD, Codd SL. Magnetic resonance analysis of capillary formation reaction front dynamics in alginate gels. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2011; 49:627-640. [PMID: 21898584 DOI: 10.1002/mrc.2788] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2011] [Revised: 05/19/2011] [Accepted: 05/31/2011] [Indexed: 05/31/2023]
Abstract
The formation of heterogeneous structures in biopolymer gels is of current interest for biomedical applications and is of fundamental interest to understanding the molecular level origins of structures generated from disordered solutions by reactions. The cation-mediated physical gelation of alginate by calcium and copper is analyzed using magnetic resonance measurements of spatially resolved molecular dynamics during gel front propagation. Relaxation time and pulse-field gradient methods are applied to determine the impact of ion front motion on molecular translational dynamics. The formation of capillaries in alginate copper gels is correlated to changes in translational dynamics.
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Affiliation(s)
- James E Maneval
- Department of Chemical Engineering, Bucknell University, Lewisburg, PA 17837, USA
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GELATION IN ALGINATE SOLUTIONS AND ITS APPLICATIONS IN CARTILAGE TISSUE-ENGINEERING AND DRUG CONTROLLED RELEASE. ACTA POLYM SIN 2010. [DOI: 10.3724/sp.j.1105.2010.10221] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Rivas-Araiza R, Alcouffe P, Rochas C, Montembault A, David L. Micron range morphology of physical chitosan hydrogels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:17495-17504. [PMID: 20879755 DOI: 10.1021/la102907u] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Physical chitosan hydrogels are potential biomaterials for several biomedical applications, such as wound healing, tissue repair, and drug delivery. Controlling the microstructural organization of chitosan gels is one of the keys for monitoring the physical, mechanical, and biological properties. As a result, the main objective of the present work was to explore the microstructural organization of chitosan hydrogels in relation with the processing conditions of gelation. For this purpose, different gelation routes were studied, that is, chitosan solution neutralization of an aqueous or hydroalcoholic solution and neutralization of an alco-gel. Overall, the resulting morphology after processing was determined by the medium viscosity during neutralization and the nature and concentration of the base. The effect of these processing parameters on the morphology was evaluated mainly through small angle light scattering (SALS) measurements including in situ measurements during chitosan neutralization. As a result, we reported different bulk microstructures consisting in 200-400 nm aggregates (primary particles) agglomerated into micrometer range clusters or arranged into more organized structures, that is, forming microchannels (4-6 μm). We thus established a qualitative and quantitative relation between supramolecular morphology and gelation conditions of chitosan hydrogels.
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Affiliation(s)
- Rocio Rivas-Araiza
- Université de Lyon, F-69361, Lyon, France, CNRS, UMR 5223, Ingénierie des Matériaux Polymères, F-69621, Villeurbanne, France
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Willenberg BJ, Zheng T, Meng FW, Meneses JC, Rossignol C, Batich CD, Terada N, Steindler DA, Weiss MD. Gelatinized copper-capillary alginate gel functions as an injectable tissue scaffolding system for stem cell transplants. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2010; 22:1621-37. [PMID: 20699061 DOI: 10.1163/092050610x519453] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In severe hypoxic-ischemic brain injury, cellular components such as neurons and astrocytes are injured or destroyed along with the supporting extracellular matrix. This presents a challenge to the field of regenerative medicine since the lack of extracellular matrix and supporting structures makes the transplant milieu inhospitable to the transplanted cells. A potential solution to this problem is the use of a biomaterial to provide the extracellular components needed to keep cells localized in cystic brain regions, allowing the cells to form connections and repair lost brain tissue. Ideally, this biomaterial would be combined with stem cells, which have been proven to have therapeutic potentials, and could be delivered via an injection. To study this approach, we derived a hydrogel biomaterial tissue scaffold from oligomeric gelatin and copper-capillary alginate gel (GCCAG). We then demonstrated that our multipotent astrocytic stem cells (MASCs) could be maintained in GCCAG scaffolds for up to 2 weeks in vitro and that the cells retained their multipotency. We next performed a pilot transplant study in which GCCAG was mixed with MASCs and injected into the brain of a neonatal rat pup. After a week in vivo, our results showed that: the GCCAG biomaterial did not cause a significant reactive gliosis; viable cells were retained within the injected scaffolds; and some delivered cells migrated into the surrounding brain tissue. Therefore, GCCAG tissue scaffolds are a promising, novel injectable system for transplantation of stem cells to the brain.
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Affiliation(s)
- Bradley Jay Willenberg
- Department of Materials Science and Engineering, University of Florida, Gainesville, 32611-6400, USA.
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Gomez d’Ayala G, Malinconico M, Laurienzo P. Marine derived polysaccharides for biomedical applications: chemical modification approaches. Molecules 2008; 13:2069-106. [PMID: 18830142 PMCID: PMC6245343 DOI: 10.3390/molecules13092069] [Citation(s) in RCA: 236] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2008] [Revised: 07/02/2008] [Accepted: 07/25/2008] [Indexed: 12/26/2022] Open
Abstract
Polysaccharide-based biomaterials are an emerging class in several biomedical fields such as tissue regeneration, particularly for cartilage, drug delivery devices and gelentrapment systems for the immobilization of cells. Important properties of the polysaccharides include controllable biological activity, biodegradability, and their ability to form hydrogels. Most of the polysaccharides used derive from natural sources; particularly, alginate and chitin, two polysaccharides which have an extensive history of use in medicine, pharmacy and basic sciences, and can be easily extracted from marine plants (algae kelp) and crab shells, respectively. The recent rediscovery of poly-saccharidebased materials is also attributable to new synthetic routes for their chemical modification, with the aim of promoting new biological activities and/or to modify the final properties of the biomaterials for specific purposes. These synthetic strategies also involve the combination of polysaccharides with other polymers. A review of the more recent research in the field of chemical modification of alginate, chitin and its derivative chitosan is presented. Moreover, we report as case studies the results of our recent work concerning various different approaches and applications of polysaccharide-based biomaterials, such as the realization of novel composites based on calcium sulphate blended with alginate and with a chemically modified chitosan, the synthesis of novel alginate-poly(ethylene glycol) copolymers and the development of a family of materials based on alginate and acrylic polymers of potential interest as drug delivery systems.
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Affiliation(s)
| | | | - Paola Laurienzo
- Istituto di Chimica e Tecnologia dei Polimeri, C.N.R.-Via Campi Flegrei, 34- 80078 Pozzuoli (Naples), Italy
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Willenberg BJ, Hamazaki T, Meng FW, Terada N, Batich C. Self-assembled copper-capillary alginate gel scaffolds with oligochitosan support embryonic stem cell growth. J Biomed Mater Res A 2007; 79:440-50. [PMID: 16941595 DOI: 10.1002/jbm.a.30942] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Biomaterial scaffolds are fundamental components of strategies aimed at engineering a wide range of tissues. Scaffolds possessing uniform, oriented microtubular architectures could be ideal for multiple tissues, but are challenging to produce. Therefore, we developed hydrogel scaffolds possessing regular, tubular microstructures from self-assembled copper-capillary alginate gel (CCAG). To abrogate the rapid dissolution of CCAG in cell culture media, we treated it with oligochitosan and created a stable oligochitosan-CCAG (OCCAG) polyelectrolyte complex. Fourier transform infrared spectroscopy confirmed polyelectrolyte complexation between alginate and oligochitosan. OCCAG retained capillary morphology, shrank anisotropically in bulk, lost Cu(2+) ions, and maintained (71.9 +/- 5.65)% of its mass in cell culture media. Next, we seeded mouse embryonic stem (ES) cells within OCCAG scaffolds, and examined cell morphology and quantified cell growth and viability over four days. ES cells were guided to form cylindrical structures of staggered cells within scaffold capillaries. Analysis of the total cells recovered from the scaffolds revealed exponential cell growth (normalized to day 0) that was statistically similar to gelatinized-plate controls. OCCAG-cultured ES cell viability was also not significantly different from controls at day 4. CCAG-derived scaffolds can therefore serve as a unique platform for stem cell-based tissue engineering.
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Affiliation(s)
- Bradley J Willenberg
- Department of Pathology, Immunology and Laboratory Medicine, University of Florida College of Medicine, Gainesville, 32610, USA
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Eljaouhari AA, Müller R, Kellermeier M, Heckmann K, Kunz W. New anisotropic ceramic membranes from chemically fixed dissipative structures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:11353-9. [PMID: 17154625 DOI: 10.1021/la061152w] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The formation of highly ordered capillaries in alginate gels is due to a dissipative convective process resulting from opposing diffusion gradients and friction. Ceramic membranes with an anisotropic pore structure have been gained from this self-organization process by incorporating inorganic particles into the gel matrix, followed by subsequent ion exchange, drying, and sintering. The aim of this study was to overcome existing preparative deficiencies and to optimize the capillary structure and surface properties with respect to specific technical applications. A new method of ion exchange was introduced, and the sintering program was improved to obtain reproducible product quality. By controlling the parameters of the self-organization reaction, the overall porosity of the ceramic membranes was adjusted to selected values between 60% and 83%. Capillary sizes were varied between 8 and 50 microm. Further modification by metal plating, particle coating, or hydrophobization led to an extended spectrum of applicability of the ceramic membranes. For the first time, anisotropic capillary ceramics have been characterized in detail as to their technical use as catalyst supports, filter membranes, or other solid-fluid and solid-gas contact processes.
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Affiliation(s)
- Ahmed A Eljaouhari
- Institute of Physical and Theoretical Chemistry, University of Regensburg, Universitätsstrasse 31, 93053 Regensburg, Germany
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