4051
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Picheth GF, Sierakowski MR, Woehl MA, Pirich CL, Schreiner WH, Pontarolo R, de Freitas RA. Characterisation of ultra-thin films of oxidised bacterial cellulose for enhanced anchoring and build-up of polyelectrolyte multilayers. Colloid Polym Sci 2013. [DOI: 10.1007/s00396-013-3048-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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4052
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Lakshmanan R, Krishnan UM, Sethuraman S. Polymeric scaffold aided stem cell therapeutics for cardiac muscle repair and regeneration. Macromol Biosci 2013; 13:1119-34. [PMID: 23982911 DOI: 10.1002/mabi.201300223] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Revised: 07/05/2013] [Indexed: 12/13/2022]
Abstract
The constantly expanding repository of novel polymers and stem cells has opened up new vistas in the field of cardiac tissue engineering. Successful regeneration of the complex cardiac tissue mainly centres on the appropriate scaffold material with topographical features that mimic the native environment. The integration of stem cells on these scaffolds is expected to enhance the regeneration potential. This review elaborates on the interplay of these vital factors in achieving the functional cardiac tissue. The recent advances in polymers, nanocomposites, and stem cells from different sources are highlighted. Special emphasis is laid on the clinical trials involving stem cells and the state-of-the-art materials to obtain a balanced perspective on the translational potential of this strategy.
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Affiliation(s)
- Rajesh Lakshmanan
- Centre for Nanotechnology & Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA University, Thanjavur, 613 401, Tamil Nadu, India
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4053
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4054
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Hay ID, Ur Rehman Z, Moradali MF, Wang Y, Rehm BHA. Microbial alginate production, modification and its applications. Microb Biotechnol 2013; 6:637-50. [PMID: 24034361 PMCID: PMC3815931 DOI: 10.1111/1751-7915.12076] [Citation(s) in RCA: 155] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Revised: 06/25/2013] [Accepted: 07/06/2013] [Indexed: 11/29/2022] Open
Abstract
Alginate is an important polysaccharide used widely in the food, textile, printing and pharmaceutical industries for its viscosifying, and gelling properties. All commercially produced alginates are isolated from farmed brown seaweeds. These algal alginates suffer from heterogeneity in composition and material properties. Here, we will discuss alginates produced by bacteria; the molecular mechanisms involved in their biosynthesis; and the potential to utilize these bacterially produced or modified alginates for high-value applications where defined material properties are required.
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Affiliation(s)
- Iain D Hay
- Institute of Fundamental Sciences, Massey University, Private Bag 11222, Palmerston North, New Zealand
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4055
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Lee J, Cha MJ, Lim KS, Kim JK, Lee SK, Kim YH, Hwang KC, Lee KY. Injectable microsphere/hydrogel hybrid system containing heat shock protein as therapy in a murine myocardial infarction model. J Drug Target 2013; 21:822-9. [DOI: 10.3109/1061186x.2013.829072] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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4056
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Agarwal A, Farouz Y, Nesmith AP, Deravi LF, McCain ML, Parker KK. Micropatterning Alginate Substrates for in vitro Cardiovascular Muscle on a Chip. ADVANCED FUNCTIONAL MATERIALS 2013; 23:3738-3746. [PMID: 26213529 PMCID: PMC4511503 DOI: 10.1002/adfm.201203319] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Soft hydrogels such as alginate are ideal substrates for building muscle in vitro because they have structural and mechanical properties close to the in vivo extracellular matrix (ECM) network. However, hydrogels are generally not amenable to protein adhesion and patterning. Moreover, muscle structures and their underlying ECM are highly anisotropic, and it is imperative that in vitro models recapitulate the structural anisotropy in reconstructed tissues for in vivo relevance due to the tight coupling between sturcture and function in these systems. We present two techniques to create chemical and structural heterogeneities within soft alginate substrates and employ them to engineer anisotropic muscle monolayers: (i) microcontact printing lines of extracellular matrix proteins on flat alginate substrates to guide cellular processes with chemical cues, and (ii) micromolding of alginate surface into grooves and ridges to guide cellular processes with topographical cues. Neonatal rat ventricular myocytes as well as human umbilical artery vascular smooth muscle cells successfully attach to both these micropatterned substrates leading to subsequent formation of anisotropic striated and smooth muscle tissues. Muscular thin film cantilevers cut from these constructs are then employed for functional characterization of engineered muscular tissues. Thus, micropatterned alginate is an ideal substrate for in vitro models of muscle tissue because it facilitates recapitulation of the anisotropic architecture of muscle, mimics the mechanical properties of the ECM microenvironment, and is amenable to evaluation of functional contractile properties.
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4057
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Therapeutic cell encapsulation: Ten steps towards clinical translation. J Control Release 2013; 170:1-14. [DOI: 10.1016/j.jconrel.2013.04.015] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Revised: 04/05/2013] [Accepted: 04/22/2013] [Indexed: 12/23/2022]
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4058
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Raemdonck K, Martens TF, Braeckmans K, Demeester J, De Smedt SC. Polysaccharide-based nucleic acid nanoformulations. Adv Drug Deliv Rev 2013; 65:1123-47. [PMID: 23680381 DOI: 10.1016/j.addr.2013.05.002] [Citation(s) in RCA: 115] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Revised: 04/24/2013] [Accepted: 05/03/2013] [Indexed: 12/24/2022]
Abstract
Therapeutic application of nucleic acids requires their encapsulation in nanosized carriers that enable safe and efficient intracellular delivery. Before the desired site of action is reached, drug-loaded nanoparticles (nanomedicines) encounter numerous extra- and intracellular barriers. Judicious nanocarrier design is highly needed to stimulate nucleic acid delivery across these barriers and maximize the therapeutic benefit. Natural polysaccharides are widely used for biomedical and pharmaceutical applications due to their inherent biocompatibility. At present, there is a growing interest in applying these biopolymers for the development of nanomedicines. This review highlights various polysaccharides and their derivatives, currently employed in the design of nucleic acid nanocarriers. In particular, recent progress made in polysaccharide-assisted nucleic acid delivery is summarized and the specific benefits that polysaccharides might offer to improve the delivery process are critically discussed.
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4059
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Interpenetrating Polymer Networks polysaccharide hydrogels for drug delivery and tissue engineering. Adv Drug Deliv Rev 2013; 65:1172-87. [PMID: 23603210 DOI: 10.1016/j.addr.2013.04.002] [Citation(s) in RCA: 320] [Impact Index Per Article: 29.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Revised: 03/15/2013] [Accepted: 04/10/2013] [Indexed: 11/22/2022]
Abstract
The ever increasing improvements of pharmaceutical formulations have been often obtained by means of the use of hydrogels. In particular, environmentally sensitive hydrogels have been investigated as "smart" delivery systems capable to release, at the appropriate time and site of action, entrapped drugs in response to specific physiological triggers. At the same time the progress in the tissue engineering research area was possible because of significant innovations in the field of hydrogels. In recent years multicomponent hydrogels, such as semi-Interpenetrating Polymer Networks (semi-IPNs) and Interpenetrating Polymer Networks (IPNs) have emerged as innovative biomaterials for drug delivery and as scaffolds for tissue engineering. These interpenetrated hydrogel networks, which can be obtained by either chemical or physical crosslinking, in most cases show physico-chemical properties that can remarkably differ from those of the macromolecular constituents. Among the synthetic and natural polymers that have been used for the preparation of semi-IPNs and IPNs, polysaccharides represent a class of macromolecules of particular interest because they are usually abundant, available from renewable sources and have a large variety of composition and properties that may allow appropriately tailored chemical modifications. Sometimes both macromolecular systems are based on polysaccharides but often also synthetic polymers are present together with polysaccharide chains. The description and discussion of (semi)-IPNs reported here, will allow to acquire a better understanding of the potential and wide range of applications of IPN polysaccharide hydrogels. A quite large number of polysaccharides have been investigated for the design of (semi)-IPNs for drug delivery and tissue engineering applications. This review article however mainly focuses on two of the most studied polysaccharide-based (semi)-IPNs, namely those obtained using alginate and hyaluronic acid. An overview of the methods of preparation, the properties, the performances as drug delivery systems and as scaffolds for tissue engineering, of (semi)-IPNs obtained using these two polysaccharides and their derivatives, will be given.
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4060
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Alvarez-Lorenzo C, Blanco-Fernandez B, Puga AM, Concheiro A. Crosslinked ionic polysaccharides for stimuli-sensitive drug delivery. Adv Drug Deliv Rev 2013; 65:1148-71. [PMID: 23639519 DOI: 10.1016/j.addr.2013.04.016] [Citation(s) in RCA: 302] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2012] [Revised: 04/15/2013] [Accepted: 04/22/2013] [Indexed: 12/13/2022]
Abstract
Polysaccharides are gaining increasing attention as components of stimuli-responsive drug delivery systems, particularly since they can be obtained in a well characterized and reproducible way from the natural sources. Ionic polysaccharides can be readily crosslinked to render hydrogel networks sensitive to a variety of internal and external variables, and thus suitable for switching drug release on-off through diverse mechanisms. Hybrids, composites and grafted polymers can reinforce the responsiveness and widen the range of stimuli to which polysaccharide-based systems can respond. This review analyzes the state of the art of crosslinked ionic polysaccharides as components of delivery systems that can regulate drug release as a function of changes in pH, ion nature and concentration, electric and magnetic field intensity, light wavelength, temperature, redox potential, and certain molecules (enzymes, illness markers, and so on). Examples of specific applications are provided. The information compiled demonstrates that crosslinked networks of ionic polysaccharides are suitable building blocks for developing advanced externally activated and feed-back modulated drug delivery systems.
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Affiliation(s)
- Carmen Alvarez-Lorenzo
- Departamento de Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidad de Santiago de Compostela, 15782-Santiago de Compostela, Spain
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4061
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Li W, Zhao P, Lin C, Wen X, Katsanevakis E, Gero D, Félix O, Liu Y. Natural polyelectrolyte self-assembled multilayers based on collagen and alginate: stability and cytocompatibility. Biomacromolecules 2013; 14:2647-56. [PMID: 23782041 DOI: 10.1021/bm4005063] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Scientific interest in the self-assembly of collagen composite films has been increasing for their potential application in constructing bioactive materials. Here we report a highly stable and cytocompatible collagen/alginate (COL/ALG) ultrathin film, which was linearly fabricated via a layer-by-layer self-assembled technique. The variation in morphology and thickness of the films in air and in solutions with different pH and ion values were tested by atomic force microscopy. Results showed that the solutions with high pH values or solutions that contained electrolytes would disintegrate the film, while films with that were cross-linked for a long time prevented the dissolution and contributed to stability maintenance of the films. Interestingly, the COL/ALG coating not only improved the adhesion and proliferation of the human periodontal ligament cells, but also modified the morphology and migration of cells on the surface of glass and poly-L-lactic acid (PLA) electrospun scaffolds. In conclusion, the COL/ALG ultrathin films were highly stable and cytocompatible and could be easily fabricated by the cost-effective self-assembled technique presented. The findings of this study have the potential to play an important role in the surface modification of biomaterials.
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Affiliation(s)
- Wenxing Li
- Department of Orthodontics, School of Stomatology, Tongji University, Shanghai, China
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4062
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Zeng Q, Han Y, Li H, Chang J. Bioglass/alginate composite hydrogel beads as cell carriers for bone regeneration. J Biomed Mater Res B Appl Biomater 2013; 102:42-51. [DOI: 10.1002/jbm.b.32978] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2013] [Revised: 04/23/2013] [Accepted: 05/05/2013] [Indexed: 01/28/2023]
Affiliation(s)
- Qiongyu Zeng
- Med-X Research Institute; School of Biomedical Engineering, Shanghai Jiao Tong University; Shanghai 200030 China
| | - Yan Han
- Med-X Research Institute; School of Biomedical Engineering, Shanghai Jiao Tong University; Shanghai 200030 China
| | - Haiyan Li
- Med-X Research Institute; School of Biomedical Engineering, Shanghai Jiao Tong University; Shanghai 200030 China
| | - Jiang Chang
- Med-X Research Institute; School of Biomedical Engineering, Shanghai Jiao Tong University; Shanghai 200030 China
- Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050 China
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4063
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Araujo V, Gamboa A, Caro N, Abugoch L, Gotteland M, Valenzuela F, Merchant HA, Basit AW, Tapia C. Release of prednisolone and inulin from a new calcium-alginate chitosan-coated matrix system for colonic delivery. J Pharm Sci 2013; 102:2748-59. [PMID: 23839971 DOI: 10.1002/jps.23656] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2013] [Revised: 06/06/2013] [Accepted: 06/11/2013] [Indexed: 11/05/2022]
Abstract
Putative colonic release formulations of calcium (Ca)-alginate coated with chitosan containing two different actives, prednisolone and inulin, were prepared in three different sizes, beads (D50 = 2104 μm) and microparticles (D50 = 354 and 136 μm). The formulations were tested in standard phosphate buffer and biorelevant Krebs bicarbonate buffer at pH 7.4, and were further evaluated in the presence of the bacterium E. coli. Product yield and encapsulation were higher with prednisolone than with inulin. In Krebs bicarbonate buffer, a clear relationship between particle size and prednisolone release was observed. In contrast, release of inulin was independent of the particle size. In phosphate buffer, the particles eroded quickly, whereas in Krebs buffer, the particles swelled slowly. The difference in behavior can be attributed to the formation of calcium phosphate in the phosphate buffer medium, which in turn weakens the Ca-alginate matrix core. In the presence of E. coli, the formulations were fermented and the release of prednisolone was accelerated. In conclusion, the buffer media affects formulation behavior and drug release, with the bicarbonate media providing a better simulation of in vivo behavior. Moreover, the susceptibility of the formulations to bacterial action indicates their suitability as carriers for colonic drug delivery.
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Affiliation(s)
- Valeria Araujo
- Departamento de Ciencia de los Alimentos y Tecnología Química, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Av. Vicuña Mackenna 20, Providencia, Santiago de Chile, Chile
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4064
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Rosas-Flores W, Ramos-Ramírez EG, Salazar-Montoya JA. Microencapsulation of Lactobacillus helveticus and Lactobacillus delbrueckii using alginate and gellan gum. Carbohydr Polym 2013; 98:1011-7. [PMID: 23987441 DOI: 10.1016/j.carbpol.2013.06.077] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2013] [Revised: 06/28/2013] [Accepted: 06/29/2013] [Indexed: 11/25/2022]
Abstract
Sodium alginate (SA) at 2% (w/v) and low acylated gellan gum (LAG) at 0.2% (w/v) were used to microencapsulate Lactobacillus helveticus and Lactobacillus delbrueckii spp lactis by employing the internal ionic gelation technique through water-oil emulsions at three different stirring rates: 480, 800 and 1200 rpm. The flow behavior of the biopolymer dispersions, the activation energy of the emulsion, the microencapsulation efficiency, the size distribution, the microcapsules morphology and the effect of the stirring rate on the culture viability were analyzed. All of the dispersions exhibited a non-Newtonian shear-thinning flow behavior because the apparent viscosity decreased in value when the shear rate was increased. The activation energy was calculated using the Arrhenius-like equation; the value obtained for the emulsion was 32.59 kJ/mol. It was observed that at 400 rpm, the microencapsulation efficiency was 92.83%, whereas at 800 and 1200 rpm, the stirring rates reduced the efficiency to 15.83% and 4.56%, respectively, evidencing the sensitivity of the microorganisms to the shear rate (13.36 and 20.05 s(-1)). Both optical and scanning electron microscopy (SEM) showed spherical microcapsules with irregular topography due to the presence of holes on its surface. The obtained size distribution range was modified when the stirring rate was increased. At 400 rpm, bimodal behavior was observed in the range of 20-420 μm; at 800 and 1200 rpm, the behavior became unimodal and the range was from 20 to 200 μm and 20 to 160 μm, respectively.
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Affiliation(s)
- Walfred Rosas-Flores
- Department of Biotechnology and Bioengineering, CINVESTAV-IPN, Av. IPN 2508, P.O. Box 14-740, CP 07360, México city, Mexico
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4065
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Abdulla R, Ravindra P. Characterization of cross linked Burkholderia cepacia lipase in alginate and κ-carrageenan hybrid matrix. J Taiwan Inst Chem Eng 2013. [DOI: 10.1016/j.jtice.2013.01.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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4066
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Tøndervik A, Klinkenberg G, Aachmann FL, Svanem BIG, Ertesvåg H, Ellingsen TE, Valla S, Skjåk-Bræk G, Sletta H. Mannuronan C-5 Epimerases Suited for Tailoring of Specific Alginate Structures Obtained by High-Throughput Screening of an Epimerase Mutant Library. Biomacromolecules 2013; 14:2657-66. [DOI: 10.1021/bm4005194] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anne Tøndervik
- Department of Biotechnology, SINTEF Materials and Chemistry, N-7465 Trondheim, Norway
| | - Geir Klinkenberg
- Department of Biotechnology, SINTEF Materials and Chemistry, N-7465 Trondheim, Norway
| | - Finn L. Aachmann
- Department of Biotechnology, Norwegian University of Science and Technology, N-7491
Trondheim, Norway
| | - Britt Iren Glærum Svanem
- Department of Biotechnology, Norwegian University of Science and Technology, N-7491
Trondheim, Norway
| | - Helga Ertesvåg
- Department of Biotechnology, Norwegian University of Science and Technology, N-7491
Trondheim, Norway
| | - Trond E. Ellingsen
- Department of Biotechnology, SINTEF Materials and Chemistry, N-7465 Trondheim, Norway
| | - Svein Valla
- Department of Biotechnology, Norwegian University of Science and Technology, N-7491
Trondheim, Norway
| | - Gudmund Skjåk-Bræk
- Department of Biotechnology, Norwegian University of Science and Technology, N-7491
Trondheim, Norway
| | - Håvard Sletta
- Department of Biotechnology, SINTEF Materials and Chemistry, N-7465 Trondheim, Norway
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4067
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Genipin-cross-linked poly(L-lysine)-based hydrogels: synthesis, characterization, and drug encapsulation. Colloids Surf B Biointerfaces 2013; 111:423-31. [PMID: 23872465 DOI: 10.1016/j.colsurfb.2013.06.028] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Revised: 06/11/2013] [Accepted: 06/12/2013] [Indexed: 01/22/2023]
Abstract
Genipin-cross-linked hydrogels composed of biodegradable and pH-sensitive cationic poly(L-lysine) (PLL), poly(L-lysine)-block-poly(L-alanine) (PLL-b-PLAla), and poly(L-lysine)-block-polyglycine (PLL-b-PGly) polypeptides were synthesized, characterized, and used as carriers for drug delivery. These polypeptide hydrogels can respond to pH-stimulus and their gelling and mechanical properties, degradation rate, and drug release behavior can be tuned by varying polypeptide composition and cross-linking degree. Comparing with natural polymers, the synthetic polypeptides with well-defined chain length and composition can warrant the preparation of the hydrogels with tunable properties to meet the criteria for specific biomedical applications. These hydrogels composed of natural building blocks exhibited good cell compatibility and enzyme degradability and can support cell attachment/proliferation. The evaluation of these hydrogels for in vitro drug release revealed that the controlled release profile was a biphasic pattern with a mild burst release and a moderate release rate thereafter, suggesting the drug molecules were encapsulated inside the gel matrix. With the versatility of polymer chemistry and conjugation of functional moieties, it is expected these hydrogels can be useful for biomedical applications such as polymer therapeutics and tissue engineering.
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4068
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Pereira RF, Carvalho A, Gil MH, Mendes A, Bártolo PJ. Influence of Aloe vera on water absorption and enzymatic in vitro degradation of alginate hydrogel films. Carbohydr Polym 2013; 98:311-20. [PMID: 23987350 DOI: 10.1016/j.carbpol.2013.05.076] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Revised: 05/21/2013] [Accepted: 05/28/2013] [Indexed: 01/24/2023]
Abstract
This study investigates the influence of Aloe vera on water absorption and the in vitro degradation rate of Aloe vera-Ca-alginate hydrogel films, for wound healing and drug delivery applications. The influence of A. vera content (5%, 15% and 25%, v/v) on water absorption was evaluated by the incubation of the films into a 0.1 M HCl solution (pH 1.0), acetate buffer (pH 5.5) and simulated body fluid solution (pH 7.4) during 24h. Results show that the water absorption is significantly higher for films containing high A. vera contents (15% and 25%), while no significant differences are observed between the alginate neat film and the film with 5% of A. vera. The in vitro enzymatic degradation tests indicate that an increase in the A. vera content significantly enhances the degradation rate of the films. Control films, incubated in a simulated body fluid solution without enzymes, are resistant to the hydrolytic degradation, exhibiting reduced weight loss and maintaining its structural integrity. Results also show that the water absorption and the in vitro degradation rate of the films can be tailored by changing the A. vera content.
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Affiliation(s)
- Rúben F Pereira
- Centre for Rapid and Sustainable Product Development, Polytechnic Institute of Leiria, Centro Empresarial da Marinha Grande, Marinha Grande, Portugal
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4069
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Daemi H, Barikani M, Barmar M. Highly stretchable nanoalginate based polyurethane elastomers. Carbohydr Polym 2013; 95:630-6. [DOI: 10.1016/j.carbpol.2013.03.039] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2013] [Revised: 03/02/2013] [Accepted: 03/11/2013] [Indexed: 11/28/2022]
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4070
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Li L, Wang L, Shao Y, Ni R, Zhang T, Mao S. Drug release characteristics from chitosan–alginate matrix tablets based on the theory of self-assembled film. Int J Pharm 2013; 450:197-207. [DOI: 10.1016/j.ijpharm.2013.04.052] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Revised: 03/15/2013] [Accepted: 04/08/2013] [Indexed: 10/26/2022]
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4071
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Development and characterization of novel alginate-based hydrogels as vehicles for bone substitutes. Carbohydr Polym 2013; 95:134-42. [DOI: 10.1016/j.carbpol.2013.02.067] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Revised: 02/17/2013] [Accepted: 02/27/2013] [Indexed: 02/06/2023]
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4072
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De’Nobili M, Curto L, Delfino J, Soria M, Fissore E, Rojas A. Performance of alginate films for retention of l-(+)-ascorbic acid. Int J Pharm 2013; 450:95-103. [DOI: 10.1016/j.ijpharm.2013.04.027] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Revised: 02/22/2013] [Accepted: 04/07/2013] [Indexed: 11/15/2022]
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4073
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Naficy S, Kawakami S, Sadegholvaad S, Wakisaka M, Spinks GM. Mechanical properties of interpenetrating polymer network hydrogels based on hybrid ionically and covalently crosslinked networks. J Appl Polym Sci 2013. [DOI: 10.1002/app.39417] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Sina Naficy
- ARC Centre of Excellence for Electromaterials Science and Intelligent Polymer Research Institute, AIIM Facility, Innovation Campus, University of Wollongong; Squires Way; North Wollongong; New South Wales; 2522; Australia
| | - Shota Kawakami
- Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology; 2-4 Hibikino; Wakamatsu-ku; Kitakyushu; 808-0196; Japan
| | - Sasha Sadegholvaad
- ARC Centre of Excellence for Electromaterials Science and Intelligent Polymer Research Institute, AIIM Facility, Innovation Campus, University of Wollongong; Squires Way; North Wollongong; New South Wales; 2522; Australia
| | - Minato Wakisaka
- Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology; 2-4 Hibikino; Wakamatsu-ku; Kitakyushu; 808-0196; Japan
| | - Geoffrey M. Spinks
- ARC Centre of Excellence for Electromaterials Science and Intelligent Polymer Research Institute, AIIM Facility, Innovation Campus, University of Wollongong; Squires Way; North Wollongong; New South Wales; 2522; Australia
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4074
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Betz JF, Cheng Y, Tsao CY, Zargar A, Wu HC, Luo X, Payne GF, Bentley WE, Rubloff GW. Optically clear alginate hydrogels for spatially controlled cell entrapment and culture at microfluidic electrode surfaces. LAB ON A CHIP 2013; 13:1854-1858. [PMID: 23559159 DOI: 10.1039/c3lc50079a] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We describe an innovation in the immobilization, culture, and imaging of cells in calcium alginate within microfluidic devices. This technique allows unprecedented optical access to the entirety of the calcium alginate hydrogel, enabling observation of growth and behavior in a chemical and mechanical environment favored by many kinds of cells.
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Affiliation(s)
- Jordan F Betz
- Fischell Department of Bioengineering, University of Maryland, College Park, MD, USA
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4075
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Shin SH, Lee J, Ahn DG, Lee KY. Co-delivery of Vascular Endothelial Growth Factor and Angiopoietin-1 Using Injectable Microsphere/Hydrogel Hybrid Systems for Therapeutic Angiogenesis. Pharm Res 2013; 30:2157-65. [DOI: 10.1007/s11095-013-1076-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2013] [Accepted: 05/08/2013] [Indexed: 11/30/2022]
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4076
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Expression of alginases and alginate polymerase genes in response to oxygen, and their relationship with the alginate molecular weight in Azotobacter vinelandii. Enzyme Microb Technol 2013; 53:85-91. [PMID: 23769307 DOI: 10.1016/j.enzmictec.2013.04.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Revised: 04/26/2013] [Accepted: 04/29/2013] [Indexed: 11/23/2022]
Abstract
The transcription of genes involved in alginate polymerization and depolymerization, as well as the alginase activity (extracellular and intracellular) under oxygen-limited and non oxygen-limited conditions in cultures of A. vinelandii, was studied. Two levels of dissolved oxygen tension (DOT) (1% and 5%, oxygen-limited and non-oxygen-limited, respectively) strictly controlled by gas blending, were evaluated in a wild type strain. In cultures at low DOT (1%), in which a high molecular weight alginate (1200 kDa) was synthesized, the transcription levels of alg8 and alg44 (genes encoding alginate polymerase complex), and algX (encoding a protein involved in polymer transport through periplasmic space) were considerably higher as compared to cultures conducted at 5% DOT, under which an alginate with a low MW (42 kDa) was produced. In the case of genes encoding for intracellular and extracellular alginases, the levels of these transcripts were higher at 1% DOT. However, intracellular and extracellular alginase activity were lower (0.017 and 0.01 U/mg protein, respectively) in cultures at 1% DOT, as compared with the activities measured at 5% DOT (0.027 and 0.052 U/mg protein for intracellular and extracellular maximum activity, respectively). The low alginase activity measured in cultures at 1% DOT and the high level of transcription of genes constituting alginate polymerase complex might be mechanisms by which oxygen regulates the production of alginates with a high MW.
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4077
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Sayyar B, Dodd M, Marquez-Curtis L, Janowska-Wieczorek A, Hortelano G. Cell-matrix Interactions of Factor IX (FIX)-engineered human mesenchymal stromal cells encapsulated in RGD-alginate vs. Fibrinogen-alginate microcapsules. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2013; 42:102-9. [DOI: 10.3109/21691401.2013.794354] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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4078
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Caridade SG, Monge C, Gilde F, Boudou T, Mano JF, Picart C. Free-standing polyelectrolyte membranes made of chitosan and alginate. Biomacromolecules 2013; 14:1653-60. [PMID: 23590116 PMCID: PMC4111514 DOI: 10.1021/bm400314s] [Citation(s) in RCA: 116] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Free-standing films have increasing applications in the biomedical field as drug delivery systems for wound healing and tissue engineering. Here, we prepared free-standing membranes by the layer-by-layer assembly of chitosan and alginate, two widely used biomaterials. Our aim was to produce a thick membrane and to study the permeation of model drugs and the adhesion of muscle cells. We first defined the optimal growth conditions in terms of pH and alginate concentration. The membranes could be easily detached from polystyrene or polypropylene substrate without any postprocessing step. The dry thickness was varied over a large range from 4 to 35 μm. A 2-fold swelling was observed by confocal microscopy when they were immersed in PBS. In addition, we quantified the permeation of model drugs (fluorescent dextrans) through the free-standing membrane, which depended on the dextran molecular weight. Finally, we showed that myoblast cells exhibited a preferential adhesion on the alginate-ending membrane as compared to the chitosan-ending membrane or to the substrate side.
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Affiliation(s)
- Sofia G Caridade
- 3B's Research Group, Biomaterials, Biodegradables, and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine AvePark, 4806-909, Taipas, Guimarães, Portugal
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4079
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Poojari R, Srivastava R. Composite alginate microspheres as the next-generation egg-box carriers for biomacromolecules delivery. Expert Opin Drug Deliv 2013; 10:1061-76. [DOI: 10.1517/17425247.2013.796361] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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4080
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Fan L, Peng K, Li M, Wang L, Wang T. Preparation and properties of carboxymethyl κ-carrageenan/alginate blend fibers. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2013; 24:1099-111. [DOI: 10.1080/09205063.2012.739538] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Lihong Fan
- a Chemical Engineering Department , Wuhan University of Technology , Wuhan , 430070 , Hubei, China
| | - Kai Peng
- a Chemical Engineering Department , Wuhan University of Technology , Wuhan , 430070 , Hubei, China
| | - Mingjia Li
- a Chemical Engineering Department , Wuhan University of Technology , Wuhan , 430070 , Hubei, China
| | - Libo Wang
- a Chemical Engineering Department , Wuhan University of Technology , Wuhan , 430070 , Hubei, China
| | - Tan Wang
- a Chemical Engineering Department , Wuhan University of Technology , Wuhan , 430070 , Hubei, China
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4081
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Duan B, Hockaday LA, Kang KH, Butcher JT. 3D bioprinting of heterogeneous aortic valve conduits with alginate/gelatin hydrogels. J Biomed Mater Res A 2013; 101:1255-64. [PMID: 23015540 PMCID: PMC3694360 DOI: 10.1002/jbm.a.34420] [Citation(s) in RCA: 539] [Impact Index Per Article: 49.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2012] [Revised: 08/01/2012] [Accepted: 08/15/2012] [Indexed: 12/22/2022]
Abstract
Heart valve disease is a serious and growing public health problem for which prosthetic replacement is most commonly indicated. Current prosthetic devices are inadequate for younger adults and growing children. Tissue engineered living aortic valve conduits have potential for remodeling, regeneration, and growth, but fabricating natural anatomical complexity with cellular heterogeneity remain challenging. In the current study, we implement 3D bioprinting to fabricate living alginate/gelatin hydrogel valve conduits with anatomical architecture and direct incorporation of dual cell types in a regionally constrained manner. Encapsulated aortic root sinus smooth muscle cells (SMC) and aortic valve leaflet interstitial cells (VIC) were viable within alginate/gelatin hydrogel discs over 7 days in culture. Acellular 3D printed hydrogels exhibited reduced modulus, ultimate strength, and peak strain reducing slightly over 7-day culture, while the tensile biomechanics of cell-laden hydrogels were maintained. Aortic valve conduits were successfully bioprinted with direct encapsulation of SMC in the valve root and VIC in the leaflets. Both cell types were viable (81.4 ± 3.4% for SMC and 83.2 ± 4.0% for VIC) within 3D printed tissues. Encapsulated SMC expressed elevated alpha-smooth muscle actin, while VIC expressed elevated vimentin. These results demonstrate that anatomically complex, heterogeneously encapsulated aortic valve hydrogel conduits can be fabricated with 3D bioprinting.
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Affiliation(s)
- Bin Duan
- Department of Biomedical Engineering, Cornell University, Ithaca, NY, USA
| | - Laura A. Hockaday
- Department of Biomedical Engineering, Cornell University, Ithaca, NY, USA
| | - Kevin H. Kang
- Department of Biomedical Engineering, Cornell University, Ithaca, NY, USA
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4082
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Chaturvedi AA, Lomme RMLM, Hendriks T, van Goor H. Prevention of postsurgical adhesions using an ultrapure alginate-based gel. Br J Surg 2013; 100:904-10. [DOI: 10.1002/bjs.9131] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/25/2013] [Indexed: 12/08/2022]
Abstract
Abstract
Background
Postoperative adhesion formation is a common consequence of abdominal surgery, and constitutes a major source of morbidity and mortality. This study evaluated an ultrapure alginate-based antiadhesive barrier gel.
Methods
Experiments were performed in a rat model with caecal abrasion and peritoneal side wall excision. The primary endpoint was the incidence of adhesions at 14 days after surgery. In experiment 1 (24 rats), animals treated with alginate gel were compared with controls that had no antiadhesive barrier. In experiment 2 (42 rats), alginate gel was compared with sodium hyaluronate carboxymethyl cellulose (HA/CMC) membrane and with no antiadhesive barrier. To check for any remote action of the gel, in experiment 3 (45 rats) application of alginate gel to the ipsilateral versus contralateral side of injury was compared with no antiadhesive barrier.
Results
In experiment 1, ultrapure alginate gel reduced the incidence of adhesions from eight of 12 in control animals to one in 12 (P = 0·009). Tissue healing assessed by histology was similar in both groups. In experiment 2, ultrapure alginate gel and HA/CMC membrane showed similar antiadhesive effectiveness, reducing the incidence of adhesions from ten of 14 rats in the control group to three of 14 (P = 0·021) and two of 14 (P = 0·006) respectively. In experiment 3, ultrapure alginate gel reduced the incidence of adhesions at the site of direct application (1 of 15) compared with controls (13 of 15; P = 0·001), but not if applied remotely (9 of 15; P = 0·214).
Conclusion
Ultrapure alginate gel decreased the incidence of postoperative adhesion formation in this rat model.
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Affiliation(s)
- A A Chaturvedi
- Department of Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
- European Medical Contract Manufacturing, Nijmegen, The Netherlands
| | - R M L M Lomme
- Department of Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - T Hendriks
- Department of Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
| | - H van Goor
- Department of Surgery, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
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4083
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Cui J, Wang M, Zheng Y, Rodríguez Muñiz GM, del Campo A. Light-Triggered Cross-Linking of Alginates with Caged Ca2+. Biomacromolecules 2013; 14:1251-6. [DOI: 10.1021/bm400022h] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Jiaxi Cui
- Max-Planck-Institut für Polymerforschung, Ackermannweg
10, 55128 Mainz, Germany
| | - Miao Wang
- Max-Planck-Institut für Polymerforschung, Ackermannweg
10, 55128 Mainz, Germany
| | - Yijun Zheng
- Max-Planck-Institut für Polymerforschung, Ackermannweg
10, 55128 Mainz, Germany
| | | | - Aránzazu del Campo
- Max-Planck-Institut für Polymerforschung, Ackermannweg
10, 55128 Mainz, Germany
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4084
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4085
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Guvendiren M, Burdick JA. Engineering synthetic hydrogel microenvironments to instruct stem cells. Curr Opin Biotechnol 2013; 24:841-6. [PMID: 23545441 DOI: 10.1016/j.copbio.2013.03.009] [Citation(s) in RCA: 159] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2012] [Revised: 03/11/2013] [Accepted: 03/11/2013] [Indexed: 11/08/2022]
Abstract
Advances in our understanding and ability to manipulate stem cell behavior are helping to move stem cell-based therapies toward the clinic. However, much of our knowledge has been gained from standard 2-dimensional culture systems, which often misrepresent many of the signals that stem cells receive in their native 3-dimensional environments. Fortunately, the field of synthetic hydrogels is developing to better recapitulate many of these signals to guide stem cell behavior, both as in vitro models and as delivery vehicles for in vivo implantation. These include a multitude of structural and biochemical cues that can be presented on the cellular scale, such as degradation, adhesion, mechanical signals, topography, and the presentation of growth factors, often with precise spatiotemporal control.
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Affiliation(s)
- Murat Guvendiren
- Department of Bioengineering, University of Pennsylvania, PA 19104, USA
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4086
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Alginate-Based Biomaterials for Regenerative Medicine Applications. MATERIALS 2013; 6:1285-1309. [PMID: 28809210 PMCID: PMC5452316 DOI: 10.3390/ma6041285] [Citation(s) in RCA: 690] [Impact Index Per Article: 62.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2012] [Revised: 02/19/2013] [Accepted: 03/19/2013] [Indexed: 02/07/2023]
Abstract
Alginate is a natural polysaccharide exhibiting excellent biocompatibility and biodegradability, having many different applications in the field of biomedicine. Alginate is readily processable for applicable three-dimensional scaffolding materials such as hydrogels, microspheres, microcapsules, sponges, foams and fibers. Alginate-based biomaterials can be utilized as drug delivery systems and cell carriers for tissue engineering. Alginate can be easily modified via chemical and physical reactions to obtain derivatives having various structures, properties, functions and applications. Tuning the structure and properties such as biodegradability, mechanical strength, gelation property and cell affinity can be achieved through combination with other biomaterials, immobilization of specific ligands such as peptide and sugar molecules, and physical or chemical crosslinking. This review focuses on recent advances in the use of alginate and its derivatives in the field of biomedical applications, including wound healing, cartilage repair, bone regeneration and drug delivery, which have potential in tissue regeneration applications.
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4087
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Martínez A, Arana P, Fernández A, Olmo R, Teijón C, Blanco M. Synthesis and characterisation of alginate/chitosan nanoparticles as tamoxifen controlled delivery systems. J Microencapsul 2013; 30:398-408. [DOI: 10.3109/02652048.2012.746747] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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4088
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Oliveira SM, Silva TH, Reis RL, Mano JF. Hierarchical fibrillar scaffolds obtained by non-conventional layer-by-layer electrostatic self-assembly. Adv Healthc Mater 2013. [PMID: 23184814 DOI: 10.1002/adhm.201200204] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A new application of layer-by-layer assembly is presented, able to create nano/micro fibrils or nanocoatings inside 3D scaffolds using non-fibrillar polyelectrolytes for tissue-engineering applications. This approach shows promise for developing advanced scaffolds with controlled nano/micro environments, and nature and architectures similar to the natural extracellular matrix, leading to improved biological performance.
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Affiliation(s)
- Sara M Oliveira
- 3Bs Research Group-Biomaterials, Biodegradables and Biomimetics, AvePark, Zona Industrial da Gandra S. Claúdio do Barco, 4806-909 Caldas das Taipas - Guimarães, Portugal
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4089
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Abstract
Therapeutic stimulation of vessel growth to improve tissue perfusion has shown promise in many regenerative medicine and tissue engineering applications. Alginate-based biomaterial systems have been investigated for growth factor and/or cell delivery as tools for modulating vessel assembly. Growth factor encapsulation allows for a sustained release of protein and protection from degradation. Implantation of growth factor-loaded alginate constructs typically shows an increase in capillary density but without vascular stabilization. Delivery of multiple factors may improve these outcomes. Cell delivery approaches focus on stimulating vascularization either via cell release of soluble factors, cell proliferation and incorporation into new vessels or alginate prevascularization prior to implantation. These methods have shown some promise but routine clinical application has not been achieved. In this review, current research on the application of alginate for therapeutic neovascularization is presented, shortcomings are addressed and the future direction of these systems discussed.
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4090
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Ko YG, Lee HJ, Chun YJ, Choi US, Yoo KP. Positive and negative electrorheological response of alginate salts dispersed suspensions under electric field. ACS APPLIED MATERIALS & INTERFACES 2013; 5:1122-1130. [PMID: 23336370 DOI: 10.1021/am302891w] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Electrorheological (ER) effects of alginic acid and alginate salts (Na(+) alginate, NH(4)(+) alginate, and Ca(2+) alginate) dispersed suspensions were investigated under DC electric fields. A noteworthy result is that the Ca(2+) alginate dispersed suspension showed negative electrorheological effects under electric fields while the other suspensions exhibited positive electrorheological effects. It is the first time that the negative ER effect is obtained with the biomacromolecule. Interestingly, at the DC electric fields, the electromigration of particles to two electrodes was observed in the negative ER fluid, while the particles-bridges formed between two electrodes in the case of the positive ER fluid. In conclusion, the specific salt type of biomacromolecules could be suitable ER particles for negative ER suspension. We believe that our study can present a new way for the development of the biocompatible and eco-friendly negative ER fluids.
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Affiliation(s)
- Young Gun Ko
- Center for Urban Energy Systems, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 136-791, Korea
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4091
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On the development and characterisation of crosslinked sodium alginate/gelatine hydrogels. J Mech Behav Biomed Mater 2013; 18:152-66. [DOI: 10.1016/j.jmbbm.2012.11.010] [Citation(s) in RCA: 145] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Revised: 11/18/2012] [Accepted: 11/25/2012] [Indexed: 01/05/2023]
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4092
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Structural and magnetic behavior of ferrogels obtained by freezing thawing of polyvinyl alcohol/poly(acrylic acid) (PAA)-coated iron oxide nanoparticles. Eur Polym J 2013. [DOI: 10.1016/j.eurpolymj.2012.11.007] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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4093
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Shin SH, Lee J, Lim KS, Rhim T, Lee SK, Kim YH, Lee KY. Sequential delivery of TAT-HSP27 and VEGF using microsphere/hydrogel hybrid systems for therapeutic angiogenesis. J Control Release 2013; 166:38-45. [DOI: 10.1016/j.jconrel.2012.12.020] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2012] [Revised: 10/21/2012] [Accepted: 12/12/2012] [Indexed: 11/26/2022]
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4094
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Hwang CM, Ay B, Kaplan DL, Rubin JP, Marra KG, Atala A, Yoo JJ, Lee SJ. Assessments of injectable alginate particle-embedded fibrin hydrogels for soft tissue reconstruction. Biomed Mater 2013; 8:014105. [PMID: 23353697 DOI: 10.1088/1748-6041/8/1/014105] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Soft tissue reconstruction is often needed after massive traumatic damage or cancer removal. In this study, we developed a novel hybrid hydrogel system consisting of alginate particles and a fibrin matrix that could maintain tissue volume long term. Alginate particles were fabricated by mixing 5% alginate with a 20 mM calcium solution. Cells and these alginate particles were then embedded in fibrin (alginate-fibrin) hydrogels using a dual syringe mixer. Cell-hydrogel constructs were evaluated in terms of cell survival and proliferation in the constructs in vitro. The results indicated that cellular viability, spreading and proliferation in the alginate-fibrin hydrogels were significantly higher compared to constructs fabricated with fibrin or alginate only. In vivo explants showed that cells contained within fibrin-only hydrogels did not contribute to neo-tissue formation, and the fibrin was fully degraded within a 12 week period. In the alginate-fibrin system, higher cellularity and vascular ingrowth were observed in vivo. This resulted in neo-tissue formation in the alginate-fibrin hydrogels. These results demonstrate that fibrin may enhance cell proliferation and accelerate the formation of extracellular matrix proteins in the alginate-fibrin system, while the alginate particles could contribute to volume retention. This injectable hybrid system composed of degradable and non-degradable hydrogels may be a preferable approach to the repair of soft tissue defects.
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Affiliation(s)
- C M Hwang
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA
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4095
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Acarregui A, Pedraz JL, Blanco FJ, Hernández RM, Orive G. Hydrogel-Based Scaffolds for Enclosing Encapsulated Therapeutic Cells. Biomacromolecules 2013; 14:322-30. [DOI: 10.1021/bm301690a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Argia Acarregui
- NanoBioCel Group,
Laboratory
of Pharmaceutics, School of Pharmacy, University of the Basque Country (UPV/EHU), Vitoria-Gasteiz, Álava,
01006, Spain
- Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Vitoria-Gasteiz, Álava, 01006, Spain
| | - Jose Luis Pedraz
- NanoBioCel Group,
Laboratory
of Pharmaceutics, School of Pharmacy, University of the Basque Country (UPV/EHU), Vitoria-Gasteiz, Álava,
01006, Spain
- Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Vitoria-Gasteiz, Álava, 01006, Spain
| | - Francisco Javier Blanco
- CIBER-BBN-Bioscaff Cartílago, INIBIC-Hospital Universitario A Coruña, A Coruña,
15006, Spain
| | - Rosa María Hernández
- NanoBioCel Group,
Laboratory
of Pharmaceutics, School of Pharmacy, University of the Basque Country (UPV/EHU), Vitoria-Gasteiz, Álava,
01006, Spain
- Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Vitoria-Gasteiz, Álava, 01006, Spain
| | - Gorka Orive
- NanoBioCel Group,
Laboratory
of Pharmaceutics, School of Pharmacy, University of the Basque Country (UPV/EHU), Vitoria-Gasteiz, Álava,
01006, Spain
- Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Vitoria-Gasteiz, Álava, 01006, Spain
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4096
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Hudson D, Margaritis A. Biopolymer nanoparticle production for controlled release of biopharmaceuticals. Crit Rev Biotechnol 2013; 34:161-79. [DOI: 10.3109/07388551.2012.743503] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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4097
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Lin YS, Yang CH, Hsu YY, Hsieh CL. Microfluidic synthesis of tail-shaped alginate microparticles using slow sedimentation. Electrophoresis 2013; 34:425-31. [PMID: 23161405 DOI: 10.1002/elps.201200282] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Revised: 08/06/2012] [Accepted: 10/02/2012] [Indexed: 11/09/2022]
Abstract
This study reports the synthesis of tail-shaped alginate particles using a microfluidic platform combined with a sedimentation strategy. By utilizing microfluidic emulsification in the cross-junction channel, the formation of regular droplets was achieved. Following a facile and convenient sedimentation process and an ionic crosslinking process, sodium-alginate droplets became tail-shaped and then gradually developed into calcium-alginate microparticles. The effects of the concentration of the CaCl(2) crosslinker and the viscosity of the alginate solution on the shape and/or size of the particles were further investigated. The proposed synthesis methodology has the advantages of actively controlling the tail-shape formation, having a narrow size distribution, as well as being a facile and convenient process with a high throughput. This approach can be applied to many applications in the pharmaceutical and biomedical arena.
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Affiliation(s)
- Yung-Sheng Lin
- Department of Applied Cosmetology and Master Program of Cosmetic Science, Hungkuang University, Taichung, Taiwan
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4098
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Biofabrication of Hydrogel Constructs. DRUG DELIVERY SYSTEMS: ADVANCED TECHNOLOGIES POTENTIALLY APPLICABLE IN PERSONALISED TREATMENT 2013. [DOI: 10.1007/978-94-007-6010-3_8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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4099
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Rice JJ, Martino MM, De Laporte L, Tortelli F, Briquez PS, Hubbell JA. Engineering the regenerative microenvironment with biomaterials. Adv Healthc Mater 2013. [PMID: 23184739 DOI: 10.1002/adhm.201200197] [Citation(s) in RCA: 270] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Modern synthetic biomaterials are being designed to integrate bioactive ligands within hydrogel scaffolds for cells to respond and assimilate within the matrix. These advanced biomaterials are only beginning to be used to simulate the complex spatio-temporal control of the natural healing microenvironment. With increasing understanding of the role of growth factors and cytokines and their interactions with components of the extracellular matrix, novel biomaterials are being developed that more closely mimic the natural healing environments of tissues, resulting in increased efficacy in applications of tissue repair and regeneration. Herein, the important aspects of the healing microenvironment, and how these features can be incorporated within innovative hydrogel scaffolds, are presented.
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Affiliation(s)
- Jeffrey J Rice
- Institute for Bioengineering, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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4100
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Miserez A, Guerette PA. Phase transition-induced elasticity of α-helical bioelastomeric fibres and networks. Chem Soc Rev 2013; 42:1973-95. [DOI: 10.1039/c2cs35294j] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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