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Edwards JV, Caston-Pierre S. Citrate-linked keto- and aldo-hexose monosaccharide cellulose conjugates demonstrate selective human neutrophil elastase-lowering activity in cotton dressings. J Funct Biomater 2013; 4:59-73. [PMID: 24955952 PMCID: PMC4030900 DOI: 10.3390/jfb4020059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2013] [Revised: 04/12/2013] [Accepted: 04/17/2013] [Indexed: 01/29/2023] Open
Abstract
Sequestration of harmful proteases as human neutrophil elastase (HNE) from the chronic wound environment is an important goal of wound dressing design and function. Monosaccharides attached to cellulose conjugates as ester-appended aldohexoses and ketohexoses were prepared on cotton gauze as monosccharide-citrate-cellulose-esters for HNE sequestration. The monosaccharide-cellulose analogs demonstrated selective binding when the derivatized cotton dressings were measured for sequestration of HNE. Each monosaccharide-cellulose conjugate was prepared as a cellulose citrate-linked monosaccharide ester on the cotton wound dressing, and assayed under wound exudate-mimicked conditions for elastase sequestration activity. A series of three aldohexose and four ketohexose ester cellulose conjugates were prepared on cotton gauze through citric acid-cellulose cross linking esterification. The monosaccharide portion of the conjugate was characterized by hydrolysis of the citrate-monosaccharide ester bond, and subsequent analysis of the free monosaccharide with high performance anion exchange chromatography. The ketohexose and aldohexose conjugate levels on cotton were quantified on cotton using chromatography and found to be present in milligram/gram amounts. The citrate-cellulose ester bonds were characterized with FTIR. Ketohexose-citrate-cellulose conjugates sequestered more elastase activity than aldohexose-citrate-cellulose conjugates. The monosaccharide cellulose conjugate families each gave distinctive profiles in elastase-lowering effects. Possible mechanisms of elastase binding to the monosaccharide-cellulose conjugates are discussed.
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Affiliation(s)
- Judson V Edwards
- USDA-ARS, Southern Regional Research Center, 1100 Robert E. Lee Blvd., New Orleans, LA 70124, USA.
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52
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Jeong HG, Kim YE, Kim YJ. Fabrication of poly(vinyl acetate)/polysaccharide biocomposite nanofibrous membranes for tissue engineering. Macromol Res 2013. [DOI: 10.1007/s13233-013-1155-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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53
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Anh TTH, Xing M, Le DHT, Sugawara-Narutaki A, Fong E. Elastin-based silver-binding proteins with antibacterial capabilities. Nanomedicine (Lond) 2013; 8:567-75. [DOI: 10.2217/nnm.13.47] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aim: To develop novel elastin-like materials with antibacterial capabilities. Materials & methods: Artificial proteins bearing AG3 silver-binding motifs (GPG-AG3) were constructed using genetic engineering. GPG-AG3 materials were prepared as GPG-AG3 protein aggregates as well as chemically crosslinked spin-coated thin films. Both GPG-AG3 protein aggregates and thin films were incubated in silver nitrate solution and characterized using electron microscopy. Results & discussion: The GPG-AG3 substrates prepared in this work have the ability to nucleate silver under physiological conditions. When tested against gram-negative Escherichia coli bacterial culture, silver-coated GPG-AG3 materials were able to inhibit bacterial growth, confirming their antibacterial properties. Conclusion: Antibacterial artificial protein materials were successfully developed, demonstrating promise for use as wound dressings and biomedical implant coatings.
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Affiliation(s)
- Truong Thi Hong Anh
- School of Materials Science & Engineering, Nanyang Technological University, Singapore
| | - Ma Xing
- School of Materials Science & Engineering, Nanyang Technological University, Singapore
| | - Duc Huynh Tien Le
- Department of Chemical System Engineering, University of Tokyo, Tokyo, Japan
| | | | - Eileen Fong
- School of Materials Science & Engineering, Nanyang Technological University, Singapore.
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54
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Khan F, Ahmad SR. Polysaccharides and Their Derivatives for Versatile Tissue Engineering Application. Macromol Biosci 2013; 13:395-421. [DOI: 10.1002/mabi.201200409] [Citation(s) in RCA: 191] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Revised: 01/06/2013] [Indexed: 12/13/2022]
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55
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Saquing CD, Tang C, Monian B, Bonino CA, Manasco JL, Alsberg E, Khan SA. Alginate–Polyethylene Oxide Blend Nanofibers and the Role of the Carrier Polymer in Electrospinning. Ind Eng Chem Res 2013. [DOI: 10.1021/ie302385b] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Carl D. Saquing
- Department
of Chemical and Biomolecular
Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, United States
| | - Christina Tang
- Department
of Chemical and Biomolecular
Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, United States
| | - Brinda Monian
- Department
of Chemical and Biomolecular
Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, United States
| | - Christopher A. Bonino
- Department
of Chemical and Biomolecular
Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, United States
| | - Joshua L. Manasco
- Department
of Chemical and Biomolecular
Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, United States
| | - Eben Alsberg
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7207,
United States
| | - Saad A. Khan
- Department
of Chemical and Biomolecular
Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, United States
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Fibrous polymeric composites based on alginate fibres and fibres made of poly-ε-caprolactone and dibutyryl chitin for use in regenerative medicine. Molecules 2013; 18:3118-36. [PMID: 23528995 PMCID: PMC6270599 DOI: 10.3390/molecules18033118] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 01/24/2013] [Accepted: 02/25/2013] [Indexed: 11/29/2022] Open
Abstract
This work concerns the production of fibrous composite materials based on biodegradable polymers such as alginate, dibutyryl chitin (DBC) and poly-ε-caprolactone (PCL). For the production of fibres from these polymers, various spinning methods were used in order to obtain composite materials of different composition and structure. In the case of alginate fibres containing the nanoadditive tricalcium phosphate (TCP), the traditional method of forming fibres wet from solution was used. However in the case of the other two polymers the electrospinning method was used. Two model systems were tested for biocompatibility. The physicochemical and basic biological tests carried out show that the submicron fibres produced using PCL and DBC have good biocompatibility. The proposed hybrid systems composed of micrometric fibres (zinc and calcium alginates containing TCP) and submicron fibres (DBC and PCL) meet the requirements of regenerative medicine. The biomimetic fibre system, the presence of TCP nanoadditive, and the use of polymers with different resorption times provide a framework with specific properties on which bone cells are able to settle and proliferate.
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Acute and impaired wound healing: pathophysiology and current methods for drug delivery, part 2: role of growth factors in normal and pathological wound healing: therapeutic potential and methods of delivery. Adv Skin Wound Care 2012; 25:349-70. [PMID: 22820962 DOI: 10.1097/01.asw.0000418541.31366.a3] [Citation(s) in RCA: 141] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
This is the second of 2 articles that discuss the biology and pathophysiology of wound healing, reviewing the role that growth factors play in this process and describing the current methods for growth factor delivery into the wound bed.
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59
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Lee H, Ahn S, Bonassar LJ, Kim G. Cell(MC3T3-E1)-Printed Poly(ϵ-caprolactone)/Alginate Hybrid Scaffolds for Tissue Regeneration. Macromol Rapid Commun 2012; 34:142-9. [DOI: 10.1002/marc.201200524] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Revised: 09/20/2012] [Indexed: 11/09/2022]
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60
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Valenzuela F, Covarrubias C, Martínez C, Smith P, Díaz-Dosque M, Yazdani-Pedram M. Preparation and bioactive properties of novel bone-repair bionanocomposites based on hydroxyapatite and bioactive glass nanoparticles. J Biomed Mater Res B Appl Biomater 2012; 100:1672-82. [PMID: 22707209 DOI: 10.1002/jbm.b.32736] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2011] [Revised: 04/18/2012] [Accepted: 04/24/2012] [Indexed: 11/06/2022]
Abstract
Bionanocomposites based on ceramic nanoparticles and a biodegradable porous matrix represent a promising strategy for bone repair applications. The preparation and bioactive properties of bionanocomposites based on hydroxyapatite (nHA) and bioactive glass (nBG) nanoparticles were presented. nHA and nBG were synthesized with nanometric particle size using sol-gel/precipitation methods. Composite scaffolds were prepared by incorporating nHA and nBG into a porous alginate (ALG) matrix at different particle loads. The ability of the bionanocomposites to induce the crystallization of the apatite phase from simulated body fluid (SBF) was systematically evaluated using X-ray diffraction (XRD), scanning electron microscopy with energy dispersive X-ray analysis, and Fourier transform infrared spectroscopy. Both nHA/ALG and nBG/ALG composites were shown to notably accelerate the process of crystallization and growth of the apatite phase on the scaffold surfaces. For short immersion times in SBF, nBG (25%)-based nanocomposites induced a higher degree of apatite crystallization than nHA (25%)-based nanocomposites, probably due to the more reactive nature of the BG particles. Through a reinforcement effect, the nanoparticles also improve the mechanical properties and stability in SBF of the polymer scaffold matrix. In addition, in vitro biocompatibility tests demonstrated that osteoblast cells are viable and adhere well on the surface of the bionanocomposites. These results indicate that nHA- and nBG-based bionanocomposites present potential properties for bone repair applications, particularly oriented to accelerate the bone mineralization process.
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Affiliation(s)
- Francisco Valenzuela
- Departamento de Ciencias Básicas, Facultad de Odontología, Universidad de Chile, Independencia, Santiago, Chile
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61
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62
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Cheng Y, Lu L, Zhang W, Shi J, Cao Y. Reinforced low density alginate-based aerogels: Preparation, hydrophobic modification and characterization. Carbohydr Polym 2012. [DOI: 10.1016/j.carbpol.2012.01.075] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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63
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Goh CH, Heng PWS, Chan LW. Alginates as a useful natural polymer for microencapsulation and therapeutic applications. Carbohydr Polym 2012. [DOI: 10.1016/j.carbpol.2011.11.012] [Citation(s) in RCA: 259] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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64
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Ahn S, Lee H, Puetzer J, Bonassar LJ, Kim G. Fabrication of cell-laden three-dimensional alginate-scaffolds with an aerosol cross-linking process. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm33749e] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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65
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Jeon O, Powell C, Solorio LD, Krebs MD, Alsberg E. Affinity-based growth factor delivery using biodegradable, photocrosslinked heparin-alginate hydrogels. J Control Release 2011; 154:258-66. [PMID: 21745508 DOI: 10.1016/j.jconrel.2011.06.027] [Citation(s) in RCA: 173] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2011] [Revised: 05/26/2011] [Accepted: 06/18/2011] [Indexed: 12/28/2022]
Abstract
Photocrosslinkable biomaterials are promising for tissue engineering applications due to their capacity to be injected and form hydrogels in situ in a minimally invasive manner. Our group recently reported on the development of photocrosslinked alginate hydrogels with controlled biodegradation rates, mechanical properties, and cell adhesive properties. In this study, we present an affinity-based growth factor delivery system by incorporating heparin into photocrosslinkable alginate hydrogels (HP-ALG), which allows for controlled, prolonged release of therapeutic proteins. Heparin modification had minimal effect on the biodegradation profiles, swelling ratios, and elastic moduli of the hydrogels in media. The release profiles of growth factors from this affinity-based platform were sustained for 3weeks with no initial burst release, and the released growth factors retained their biological activity. Implantation of bone morphogenetic protein-2 (BMP-2)-loaded photocrosslinked alginate hydrogels induced moderate bone formation around the implant periphery. Importantly, BMP-2-loaded photocrosslinked HP-ALG hydrogels induced significantly more osteogenesis than BMP-2-loaded photocrosslinked unmodified alginate hydrogels, with 1.9-fold greater peripheral bone formation and 1.3-fold greater calcium content in the BMP-2-loaded photocrosslinked HP-ALG hydrogels compared to the BMP-2-loaded photocrosslinked unmodified alginate hydrogels after 8weeks implantation. This sustained and controllable growth factor delivery system, with independently controllable physical and cell adhesive properties, may provide a powerful modality for a variety of therapeutic applications.
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Affiliation(s)
- Oju Jeon
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106, USA
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66
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Rnjak J, Wise SG, Mithieux SM, Weiss AS. Severe Burn Injuries and the Role of Elastin in the Design of Dermal Substitutes. TISSUE ENGINEERING PART B-REVIEWS 2011; 17:81-91. [DOI: 10.1089/ten.teb.2010.0452] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Jelena Rnjak
- School of Molecular Bioscience, University of Sydney, Sydney, Australia
| | - Steven G. Wise
- School of Molecular Bioscience, University of Sydney, Sydney, Australia
| | | | - Anthony S. Weiss
- School of Molecular Bioscience, University of Sydney, Sydney, Australia
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67
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Bonino CA, Krebs MD, Saquing CD, Jeong SI, Shearer KL, Alsberg E, Khan SA. Electrospinning alginate-based nanofibers: From blends to crosslinked low molecular weight alginate-only systems. Carbohydr Polym 2011. [DOI: 10.1016/j.carbpol.2011.02.002] [Citation(s) in RCA: 138] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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68
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Vasconcelos A, Cavaco-Paulo A. Wound dressings for a proteolytic-rich environment. Appl Microbiol Biotechnol 2011; 90:445-60. [DOI: 10.1007/s00253-011-3135-4] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2010] [Revised: 01/17/2011] [Accepted: 01/17/2011] [Indexed: 11/28/2022]
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69
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Biopolymers for Hard and Soft Engineered Tissues: Application in Odontoiatric and Plastic Surgery Field. Polymers (Basel) 2011. [DOI: 10.3390/polym3010509] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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70
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Jeong SI, Krebs MD, Bonino CA, Samorezov JE, Khan SA, Alsberg E. Electrospun Chitosan–Alginate Nanofibers with In Situ Polyelectrolyte Complexation for Use as Tissue Engineering Scaffolds. Tissue Eng Part A 2011; 17:59-70. [DOI: 10.1089/ten.tea.2010.0086] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Affiliation(s)
- Sung In Jeong
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio
| | - Melissa D. Krebs
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio
| | - Christopher A. Bonino
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina
| | - Julia E. Samorezov
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio
| | - Saad A. Khan
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina
| | - Eben Alsberg
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio
- Department of Orthopaedic Surgery, Case Western Reserve University, Cleveland, Ohio
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71
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Kim G, Ahn S, Kim Y, Cho Y, Chun W. Coaxial structured collagen–alginate scaffolds: fabrication, physical properties, and biomedical application for skin tissue regeneration. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm03452e] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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72
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Self-assembling elastin-like peptides growth factor chimeric nanoparticles for the treatment of chronic wounds. Proc Natl Acad Sci U S A 2010; 108:1034-9. [PMID: 21193639 DOI: 10.1073/pnas.1009881108] [Citation(s) in RCA: 139] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Chronic wounds are associated with poor epidermal and dermal remodeling. Previous work has shown the efficacy of keratinocyte growth factor (KGF) in reepithelialization and elastin in dermal wound healing. Here we demonstrate the fabrication of a fusion protein comprising of elastin-like peptides and KGF. This fusion protein retains the performance characteristics of KGF and elastin as evidenced by its enhancement of keratinocyte and fibroblast proliferation. It also preserved the characteristic elastin-like peptides inverse phase transitioning allowing the recombinant protein to be expressed in bacterial hosts (such as Escherichia coli) and purified rapidly and easily using inverse temperature cycling. The fusion protein self-assembled into nanoparticles at physiological temperatures. When applied to full thickness, wounds in Lepr(db) diabetic mice these particles enhanced reepithelialization and granulation, by 2- and 3-fold respectively, when compared to the controls. The data strongly suggests that these self-assembled nanoparticles may be beneficial in the treatment of chronic wounds resulting from diabetes or other underlying circulatory conditions.
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73
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74
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Silva SS, Mano JF, Reis RL. Potential applications of natural origin polymer-based systems in soft tissue regeneration. Crit Rev Biotechnol 2010; 30:200-21. [PMID: 20735324 DOI: 10.3109/07388551.2010.505561] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Despite the many advances in tissue engineering approaches, scientists still face significant challenges in trying to repair and replace soft tissues. Nature-inspired routes involving the creation of polymer-based systems of natural origins constitute an interesting alternative route to produce novel materials. The interest in these materials comes from the possibility of constructing multi-component systems that can be manipulated by composition allowing one to mimic the tissue environment required for the cellular regeneration of soft tissues. For this purpose, factors such as the design, choice, and compatibility of the polymers are considered to be key factors for successful strategies in soft tissue regeneration. More recently, polysaccharide-protein based systems have being increasingly studied and proposed for the treatment of soft tissues. The characteristics, properties, and compatibility of the resulting materials investigated in the last 10 years, as well as commercially available matrices or those currently under investigation are the subject matter of this review.
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Affiliation(s)
- Simone S Silva
- 3B's Research Group- Biomaterials, Biodegradables and Biomimetics, Dept. of Polymer Engineering, University of Minho, Headquarters of European Institute of Excellence on Tissue Engineering and Regenerative Medicine - AvePark, Zona Industrial da Gandra - Caldas das Taipas - 4806-909 Guimarães- Portugal.
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75
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Ozbolat IT, Koc B. Modeling of Spatially Controlled Biomolecules in Three-Dimensional Porous Alginate Structures. J Med Device 2010. [DOI: 10.1115/1.4002612] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
This paper presents a computer-aided design (CAD) of 3D porous tissue scaffolds with spatial control of encapsulated biomolecule distributions. A localized control of encapsulated biomolecule distribution over 3D structures is proposed to control release kinetics spatially for tissue engineering and drug release. Imaging techniques are applied to explore distribution of microspheres over porous structures. Using microspheres in this study represents a framework for modeling the distribution characteristics of encapsulated proteins, growth factors, cells, and drugs. A quantification study is then performed to assure microsphere variation over various structures under imaging analysis. The obtained distribution characteristics are mimicked by the developed stochastic modeling study of microsphere distribution over 3D engineered freeform structures. Based on the stochastic approach, 3D porous structures are modeled and designed in CAD. Modeling of microsphere and encapsulating biomaterial distribution in this work helps develop comprehensive modeling of biomolecule release kinetics for further research. A novel multichamber single nozzle solid freeform fabrication technique is utilized to fabricate sample structures. The presented methods are implemented and illustrative examples are presented in this paper.
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Affiliation(s)
- Ibrahim T. Ozbolat
- Department of Industrial and Systems Engineering, University at Buffalo, State University of New York, 438 Bell Hall, Buffalo, NY 14260
| | - Bahattin Koc
- Sabanci University, Faculty of Engineering and Natural Sciences, Orhanli-Tuzla, Istanbul/Turkey 34956; Department of Industrial and Systems Engineering, University at Buffalo, State University of New York, 438 Bell Hall, Buffalo, NY 14260
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76
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Jeong SI, Krebs MD, Bonino CA, Khan SA, Alsberg E. Electrospun Alginate Nanofibers with Controlled Cell Adhesion for Tissue Engineeringa. Macromol Biosci 2010; 10:934-43. [DOI: 10.1002/mabi.201000046] [Citation(s) in RCA: 115] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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77
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Han J, Zhou Z, Yin R, Yang D, Nie J. Alginate–chitosan/hydroxyapatite polyelectrolyte complex porous scaffolds: Preparation and characterization. Int J Biol Macromol 2010; 46:199-205. [DOI: 10.1016/j.ijbiomac.2009.11.004] [Citation(s) in RCA: 133] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2009] [Revised: 11/15/2009] [Accepted: 11/18/2009] [Indexed: 10/20/2022]
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78
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Hou Q, Walsh MC, Freeman R, Barry JJA, Howdle SM, Shakesheff KM. Incorporation of proteins within alginate fibre-based scaffolds using a post-fabrication entrapment method. J Pharm Pharmacol 2010; 58:895-902. [PMID: 16805948 DOI: 10.1211/jpp.58.7.0003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Abstract
In this study, a physical entrapment process was explored for the incorporation of proteins within preformed fibrous alginates and the release profile was tuned by varying the processing parameters. The entrapment process was carried out in a series of aqueous solutions at room temperature and involved pre-swelling of the fibrous alginate within a Na+-rich solution, followed by exposure to the protein of choice and entrapping it by re-establishing cross-links of alginate with BaCl2. Entrapment and release of fluorescein isothiocyanate-labelled bovine serum albumin (FITC-BSA), a model protein, was studied. It was found that a sustained release of the incorporated protein in cell culture medium for about 6 days was achieved. The main factors determining the release profile included the NaCl/CaCl2 ratio in the pre-swelling solution, protein concentration, and the exposure time. To retard protein release, alginate fibres with entrapped FITC-BSA were processed together with poly(d, l-lactide) (PDLLA) into porous alginate fibre/PDLLA composites using supercritical CO2. In this manner, release of the protein for up to 3 months was achieved.
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Affiliation(s)
- Qingpu Hou
- Division of Drug Delivery and Tissue Engineering, School of Pharmacy, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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79
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Boguń M, Mikołajczyk T, Rabiej S. Effect of formation conditions on the structure and properties of nanocomposite alginate fibers. J Appl Polym Sci 2009. [DOI: 10.1002/app.30465] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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80
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Lee KY, Jeong L, Kang YO, Lee SJ, Park WH. Electrospinning of polysaccharides for regenerative medicine. Adv Drug Deliv Rev 2009; 61:1020-32. [PMID: 19643155 DOI: 10.1016/j.addr.2009.07.006] [Citation(s) in RCA: 298] [Impact Index Per Article: 19.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2009] [Accepted: 07/16/2009] [Indexed: 10/20/2022]
Abstract
Electrospinning techniques enable the production of continuous fibers with dimensions on the scale of nanometers from a wide range of natural and synthetic polymers. The number of recent studies regarding electrospun polysaccharides and their derivatives, which are potentially useful for regenerative medicine, is increasing dramatically. However, difficulties regarding the processibility of the polysaccharides (e.g., poor solubility and high surface tension) have limited their application. In this review, we summarize the characteristics of various polysaccharides such as alginate, cellulose, chitin, chitosan, hyaluronic acid, starch, dextran, and heparin, which are either currently being used or have potential to be used for electrospinning. The recent progress of nanofiber matrices electrospun from polysaccharides and their biomedical applications in tissue engineering, wound dressings, drug delivery, and enzyme immobilization are discussed.
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81
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Kobayashi H, Katakura O, Morimoto N, Akiyoshi K, Kasugai S. Effects of cholesterol-bearing pullulan (CHP)-nanogels in combination with prostaglandin E1 on wound healing. J Biomed Mater Res B Appl Biomater 2009; 91:55-60. [DOI: 10.1002/jbm.b.31373] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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82
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Nie H, He A, Wu W, Zheng J, Xu S, Li J, Han CC. Effect of poly(ethylene oxide) with different molecular weights on the electrospinnability of sodium alginate. POLYMER 2009. [DOI: 10.1016/j.polymer.2009.07.043] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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83
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Antonicelli F, Bellon G, Lorimier S, Hornebeck W. Role of the elastin receptor complex (S-Gal/Cath-A/Neu-1) in skin repair and regeneration. Wound Repair Regen 2009; 17:631-8. [DOI: 10.1111/j.1524-475x.2009.00525.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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84
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Barbetta A, Barigelli E, Dentini M. Porous Alginate Hydrogels: Synthetic Methods for Tailoring the Porous Texture. Biomacromolecules 2009; 10:2328-37. [DOI: 10.1021/bm900517q] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Andrea Barbetta
- Department of Chemistry, University of Rome “La Sapienza”, P.le A. Moro 5, 00185 Rome, Italy
| | - Elena Barigelli
- Department of Chemistry, University of Rome “La Sapienza”, P.le A. Moro 5, 00185 Rome, Italy
| | - Mariella Dentini
- Department of Chemistry, University of Rome “La Sapienza”, P.le A. Moro 5, 00185 Rome, Italy
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85
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Garcia Y, Hemantkumar N, Collighan R, Griffin M, Rodriguez-Cabello JC, Pandit A. In vitro characterization of a collagen scaffold enzymatically cross-linked with a tailored elastin-like polymer. Tissue Eng Part A 2009; 15:887-99. [PMID: 18976154 DOI: 10.1089/ten.tea.2008.0104] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Collagen, the main structural component of the extracellular matrix (ECM), provides tensile stiffness to different structures and organs against rupture. However, collagen tissue-engineered implants are hereto still lacking in mechanical strength. Attempts to create stiffer scaffolds have resulted in increased brittleness of the material, reducing the versatility of the original component. The hypothesis behind this research is that the introduction of an elastic element in the scaffold will enhance the mechanical properties of the collagen-based scaffolds, as elastin does in the ECM to prevent irreversible deformation. In this study, an elastin-like polymer (ELP) designed and synthesized using recombinant DNA methodology is used with the view to providing increased proteolytic resistance and increased functionality to the scaffolds by carrying specific sequences for microbial transglutaminase cross-linking, endothelial cell adhesion, and drug delivery. Evaluation of the effects that cross-linking ELP-collagen has on the physicochemical properties of the scaffold such as porosity, presence of cross-linking, thermal behavior, and mechanical strength demonstrated that the introduction of enzymatically resistant covalent bonds between collagen and ELP increases the mechanical strength of the scaffolds in a dose-dependent manner without significantly affecting the porosity or thermal properties of the original scaffold. Importantly, the scaffolds also showed selective behavior, in a dose (ELP)-dependent manner toward human umbilical vein endothelial cells and smooth muscle cells when compared to fibroblasts.
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Affiliation(s)
- Yolanda Garcia
- Department of Anatomy, National University of Ireland Galway, Galway, Ireland.
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86
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Notara M, Scotchford CA, Grant DM, Weston N, Roberts GAF. Cytocompatibility and hemocompatibility of a novel chitosan-alginate gel system. J Biomed Mater Res A 2009; 89:854-64. [DOI: 10.1002/jbm.a.32027] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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87
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Machida-Sano I, Matsuda Y, Namiki H. In vitro
adhesion of human dermal fibroblasts on iron cross-linked alginate films. Biomed Mater 2009; 4:025008. [DOI: 10.1088/1748-6041/4/2/025008] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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88
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Moon S, Ryu BY, Choi J, Jo B, Farris RJ. The morphology and mechanical properties of sodium alginate based electrospun poly(ethylene oxide) nanofibers. POLYM ENG SCI 2009. [DOI: 10.1002/pen.21216] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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89
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90
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Li Z, Gunn J, Chen M, Cooper A, Zhang M. On‐site alginate gelation for enhanced cell proliferation and uniform distribution in porous scaffolds. J Biomed Mater Res A 2008; 86:552-9. [DOI: 10.1002/jbm.a.31596] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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91
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Tanihara M, Kajiwara K, Ida K, Suzuki Y, Kamitakahara M, Ogata SI. The biodegradability of poly(Pro-Hyp-Gly) synthetic polypeptide and the promotion of a dermal wound epithelialization using a poly(Pro-Hyp-Gly) sponge. J Biomed Mater Res A 2008; 85:133-9. [PMID: 17688259 DOI: 10.1002/jbm.a.31496] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Collagens are widely used in medical applications, but animal-derived collagens have several drawbacks, such as low thermal stability, nonspecific cell attachment, and susceptibility to contamination by infectious pathogens, such as prions, which may transfect humans. We have previously reported the chemical synthesis of polypeptides consisting of a Pro-Hyp-Gly sequence and the high thermostability of their triple-helical structure. To clarify the biomaterial characteristics of the poly(Pro-Hyp-Gly) polypeptide, we assessed its biodegradability and its capability for skin regeneration. Eight weeks after implantation, a poly(Pro-Hyp-Gly) freeze-dried sponge embedded subcutaneously into a rat dorsal area degraded at the same rate as Terudermis, which is made from bovine type I atelocollagen and is used as an artificial dermis. Surprisingly, compared with Terudermis, the poly(Pro-Hyp-Gly) sponge significantly promoted epithelialization of a full-thickness wound on a rabbit's ear pad. This chemically synthesized polypeptide may be useful as a scaffold for tissue engineering and tissue regeneration.
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Affiliation(s)
- Masao Tanihara
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan.
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92
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Nie H, He A, Zheng J, Xu S, Li J, Han CC. Effects of Chain Conformation and Entanglement on the Electrospinning of Pure Alginate. Biomacromolecules 2008; 9:1362-5. [DOI: 10.1021/bm701349j] [Citation(s) in RCA: 160] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Huarong Nie
- State Key Laboratory of Polymer Physics and Chemistry, Joint Laboratory of Polymer Science and Materials, Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China, School of Materials Science and Engineering, Nanchang University, Nanjing East Road 235, Nanchang 330047, China
| | - Aihua He
- State Key Laboratory of Polymer Physics and Chemistry, Joint Laboratory of Polymer Science and Materials, Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China, School of Materials Science and Engineering, Nanchang University, Nanjing East Road 235, Nanchang 330047, China
| | - Jianfen Zheng
- State Key Laboratory of Polymer Physics and Chemistry, Joint Laboratory of Polymer Science and Materials, Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China, School of Materials Science and Engineering, Nanchang University, Nanjing East Road 235, Nanchang 330047, China
| | - Shanshan Xu
- State Key Laboratory of Polymer Physics and Chemistry, Joint Laboratory of Polymer Science and Materials, Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China, School of Materials Science and Engineering, Nanchang University, Nanjing East Road 235, Nanchang 330047, China
| | - Junxing Li
- State Key Laboratory of Polymer Physics and Chemistry, Joint Laboratory of Polymer Science and Materials, Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China, School of Materials Science and Engineering, Nanchang University, Nanjing East Road 235, Nanchang 330047, China
| | - Charles C. Han
- State Key Laboratory of Polymer Physics and Chemistry, Joint Laboratory of Polymer Science and Materials, Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China, School of Materials Science and Engineering, Nanchang University, Nanjing East Road 235, Nanchang 330047, China
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93
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Sun W, Lin H, Xie H, Chen B, Zhao W, Han Q, Zhao Y, Xiao Z, Dai J. Collagen membranes loaded with collagen-binding human PDGF-BB accelerate wound healing in a rabbit dermal ischemic ulcer model. Growth Factors 2007; 25:309-18. [PMID: 18236209 DOI: 10.1080/08977190701803885] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Studies have shown that exogenous platelet-derived growth factor-BB (PDGF-BB) could accelerate the ulcer healing, but the lack of efficient growth factor delivery system limits its clinical application. Our previous work has demonstrated that the native human PDGF-BB was added a collagen-binding domain (CBD), TKKTLRT, to develop a collagen-based PDGF targeting delivery system. Here, we showed that this CBD-fused PDGF-BB (CBD-PDGF) could bind to collagen membrane efficiently. We used the rabbit dermal ischemic ulcer model to study the effects of CBD-PDGF loaded on collagen membranes. Results revealed that this system maintained a higher concentration and stronger bioactivity of PDGF-BB on the collagen membranes and promoted the re-epithelialization of dermal ulcer wounds, the collagen deposition, and the formation of capillary lumens within the newly formed tissue area. It demonstrated that collagen membranes loaded with collagen-targeting human PDGF-BB could effectively promote ulcer healing.
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Affiliation(s)
- Wenjie Sun
- Key laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
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94
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Freitas VM, Vilas-Boas VF, Pimenta DC, Loureiro V, Juliano MA, Carvalho MR, Pinheiro JJV, Camargo ACM, Moriscot AS, Hoffman MP, Jaeger RG. SIKVAV, a laminin alpha1-derived peptide, interacts with integrins and increases protease activity of a human salivary gland adenoid cystic carcinoma cell line through the ERK 1/2 signaling pathway. THE AMERICAN JOURNAL OF PATHOLOGY 2007; 171:124-38. [PMID: 17591960 PMCID: PMC1941583 DOI: 10.2353/ajpath.2007.051264] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Adenoid cystic carcinoma is a frequently occurring malignant salivary gland neoplasm. We studied the induction of protease activity by the laminin-derived peptide, SIKVAV, in cells (CAC2) derived from this neoplasm. Laminin alpha1 and matrix metalloproteinases (MMPs) 2 and 9 were immunolocalized in adenoid cystic carcinoma cells in vivo and in vitro. CAC2 cells cultured on SIKVAV showed a dose-dependent increase of MMP9 as detected by zymography and colocalization of alpha3 and alpha6 integrins. Small interfering RNA (siRNA) knockdown of integrin expression in CAC2 cells resulted in decreased adhesion to the peptide. SIKVAV affinity chromatography and immunoblot analysis showed that alpha3, alpha6, and beta1 integrins were eluted from the SIKVAV column, which was confirmed by mass spectrometry and a solid-phase binding assay. Small interfering RNA experiments also showed that these integrins, through extracellular signal-regulated kinase (ERK) 1/2 signaling, regulate MMP secretion induced by SIKVAV in CAC2 cells. We propose that SIKVAV increases protease activity of a human salivary gland adenoid cystic carcinoma cell line through alpha3beta1 and alpha6beta1 integrins and the ERK 1/2 signaling pathway.
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Affiliation(s)
- Vanessa M Freitas
- Universidade de São Paulo, Instituto de Ciências Biomédicas, Departamento de Biologia Celular e do Desenvolvimento, Av Prof Lineu Prestes 1524, Ed Biomédicas 1, sala 405, São Paulo SP, Brazil
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95
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Kim IY, Yoo MK, Seo JH, Park SS, Na HS, Lee HC, Kim SK, Cho CS. Evaluation of semi-interpenetrating polymer networks composed of chitosan and poloxamer for wound dressing application. Int J Pharm 2007; 341:35-43. [PMID: 17482781 DOI: 10.1016/j.ijpharm.2007.03.042] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2006] [Revised: 03/22/2007] [Accepted: 03/28/2007] [Indexed: 11/20/2022]
Abstract
We have elsewhere reported the work on the preparation of semi-interpenetrating polymer networks (SIPNs) composed of chitosan (CS) and poloxamer to improve the mechanical strength of CS sponge. This study focuses on evaluation of the CS/poloxamer SIPNs to intend for wound dressing application and the efficacy of dehydroepiandrosterone (DHEA)-loaded CS/poloxamer SIPNs in the wound model studies. The properties required for ideal wound dressing, such as equilibrium water content (EWC), water absorption (A(w)), water vapor transmission rate (WVTR), and evaporative water loss, were examined. The CS/poloxamer SIPNs were found to have a water content of 90% of their weight which could prevent the wound bed from accumulation of exudates and also have excellent water adsorption. The WVTR of CS/poloxamer SIPNs was found to be 2,508.2+/-65.7gm(-2)day(-1), indicating that the SIPNs can maintain a moist environment over wound bed in moderate to heavily exuding wound which enhances epithelial cell migration during the healing process. Also, the CS/poloxamer SIPNs in vitro assessment showed proper biodegradation and low cytotoxicity for wound dressing application. The wound healing efficacy of CS/poloxamer SIPNs as a wound dressing was evaluated on experimental full thickness wounds in a mouse model. It was found that the wounds covered with CS/poloxamer SIPNs or DHEA-loaded CS/poloxamer SIPNs were completely filled with new epithelium without any significant adverse reactions after 3 weeks. The results thus indicate that CS/poloxamer SIPNs could be employed in the future as potential wound dressing materials.
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Affiliation(s)
- I Y Kim
- School of Agricultural Biotechnology, Seoul National University, Seoul 151-921, South Korea
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96
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97
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Hill E, Boontheekul T, Mooney DJ. Designing scaffolds to enhance transplanted myoblast survival and migration. ACTA ACUST UNITED AC 2006; 12:1295-304. [PMID: 16771642 DOI: 10.1089/ten.2006.12.1295] [Citation(s) in RCA: 127] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Myoblast transplantation is currently limited by poor survival and integration of these cells into host musculature. Transplantation systems that enhance the viability of the cells and induce their outward migration to populate injured muscle may enhance the success of this approach to muscle regeneration. In this study, enriched populations of primary myoblasts were seeded onto delivery vehicles formed from alginate, and the role of vehicle design and local growth factor delivery in cell survival and migration were examined. Only 5 +/- 2.5% of cells seeded into nanoporous alginate gels survived for 24 h and only 4 +/- 0.5% migrated out of the gels. Coupling cell adhesion peptides (G4RGDSP) to the alginate prior to gelling slightly increased the viability of cells within the scaffold to 16 +/- 1.4% and outward migration to 6 +/- 1%. However, processing peptide-modified alginate gels to yield macroporous scaffolds, in combination with sustained delivery of HGF and FGF2 from the material, dramatically increased the viability of seeded cells over a 5-day time course and increased outward migration to 110 +/- 12%. This data indicate long-term survival and migration of myoblasts placed within polymeric delivery vehicles can be greatly increased by appropriate scaffold composition, architecture, and growth factor delivery. This system may be particularly useful in the regeneration of muscle tissue and be broadly useful in the regeneration of other tissues as well.
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Affiliation(s)
- Elliott Hill
- Department of Biologic and Material Sciences, University of Michigan, Ann Arbor, Michigan, USA
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98
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Becker TA, Preul MC, Bichard WD, Kipke DR, McDougall CG. Calcium alginate gel as a biocompatible material for endovascular arteriovenous malformation embolization: six-month results in an animal model. Neurosurgery 2006; 56:793-801; discussion 793-801. [PMID: 15792518 DOI: 10.1227/01.neu.0000156494.94675.bb] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2004] [Accepted: 09/30/2004] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVE We sought to expand our assessment of calcium alginate as an embolic agent in an animal model of a cerebral arteriovenous malformation (AVM). The objective of this study was to assess the long-term biocompatibility and stability of calcium alginate in AVM swine models that survived from 1 to 6 months. METHODS The swine model included a carotid-jugular anastomosis to redirect flow to the rete mirabile (RM), thereby simulating flow to an AVM. Alginate and the reactive component, calcium chloride, were injected from double-lumen or concentric-tube microcatheters to form an occlusion of the RM feeding vessel and the inferior portion of the RM. RESULTS Angiography and histology verified complete occlusion of the RM feeding vessel for up to 6 months in eight of nine swine. Blood flow remained open to the superior portion of the RM and the circle of Willis. No evidence of downstream calcium alginate gel was seen in the follow-up angiograms or the histological preparations of the circle of Willis. A minor bioactive response to the alginate gel was noted at 1 month, yet no degenerative or inflammatory response was seen. At 6 months, there was moderate fibrous tissue around the alginate, which further sealed off flow to the embolized areas of the RM. CONCLUSION Over a period of 6 months, calcium alginate was an effective endovascular occlusion material that blocked blood flow to the inferior portion of the RM. The chronic AVM model verified the long-term stability and biocompatibility of calcium alginate.
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Affiliation(s)
- Timothy A Becker
- Neural Engineering Laboratory, Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, USA.
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99
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Abstract
Porous scaffold containing biodegradable Ca-crosslinked alginate(ALG) and nano-hydroxyapatite(n-HA) is synthesized by the freeze-extraction and freeze-gelation methods. The prepared scaffolds were tested by scanning electron microscopy (SEM), transmission electron microscopy (TEM), infrared absorption spectra (IR), raman spectra, X-ray diffraction (XRD) and burning test. Chemical binding between inorganic n-HA and Ca-crosslinked alginate was investigated. It indicated that n-HA was interacted with Ca-crosslinked alginate. The results of SEM showed that the scaffolds exhibited open-cellular pore structures. The content of n-HA affected the porosity and pore size of the composite. The composite can be a promising scaffold material for tissue engineering.
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100
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Hou Q, Rutten FJM, Smith EF, Briggs D, Davies MC, Buttery LDK, Freeman R, Shakesheff KM. Surface characterization of pre-formed alginate fibres incorporated with a protein by a novel entrapment process. SURF INTERFACE ANAL 2005. [DOI: 10.1002/sia.2082] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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