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Zhang WF, Zhou HY, Chen XG, Tang SH, Zhang JJ. Biocompatibility study of theophylline/chitosan/beta-cyclodextrin microspheres as pulmonary delivery carriers. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2009; 20:1321-1330. [PMID: 19132506 DOI: 10.1007/s10856-008-3680-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2008] [Accepted: 12/22/2008] [Indexed: 05/27/2023]
Abstract
To evaluate the biocompatibility of the theophylline/chitosan/beta-cyclodextrin microspheres, which has a potential application in pulmonary delivery system. The detection of LDH and protein in BALF was examined acute cell toxicity, hemolysis test was carried out to estimate blood toxicity; Micronucleus Test was reckoned to identify genotoxicity, MTT assay was used to evaluate in vitro cytotoxicity, and muscle implantation investigated the tissue biocompatibility. The results demonstrated that the total contents of protein and LDH in BALF were not significantly different from that of normal group. The experiments showed that the cytotoxicity was depended on the concentration and had no cytoxicity at low concentration and no hemolysis activity. The micronucleus frequency of MS B was 0.99 per thousand, which showed no genotoxic effects either. The results of implantation showed that the microspheres had no effect on hemoglobin and no toxicity in the liver and kidney. The inflammations of muscle tissue were not significantly different from that of operative suture, therefore, the MS B possess high good biocompatibility and can be applied in pulmonary sustained release systems.
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Affiliation(s)
- Wei Fen Zhang
- Department of Basic Medicine, Weifang Medical University, People's Republic of China
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Zhang Y, He H, Gao WJ, Lu SY, Liu Y, Gu HY. Rapid adhesion and proliferation of keratinocytes on the gold colloid/chitosan film scaffold. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2009. [DOI: 10.1016/j.msec.2008.07.040] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Li YY, Chen XG, Zhang J, Liu CS, Xue YP, Sun GZ, Zhang WF. In vitrorelease of rifampicin and biocompatibility of oleoylchitosan nanoparticles. J Appl Polym Sci 2009. [DOI: 10.1002/app.29175] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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55
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Muzzarelli RA. Chitins and chitosans for the repair of wounded skin, nerve, cartilage and bone. Carbohydr Polym 2009. [DOI: 10.1016/j.carbpol.2008.11.002] [Citation(s) in RCA: 632] [Impact Index Per Article: 42.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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56
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Ignatova M, Manolova N, Markova N, Rashkov I. Electrospun Non-Woven Nanofibrous Hybrid Mats Based on Chitosan and PLA for Wound-Dressing Applications. Macromol Biosci 2009; 9:102-11. [DOI: 10.1002/mabi.200800189] [Citation(s) in RCA: 157] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Lu S, Gao W, Gu HY. Construction, application and biosafety of silver nanocrystalline chitosan wound dressing. Burns 2008; 34:623-8. [DOI: 10.1016/j.burns.2007.08.020] [Citation(s) in RCA: 119] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2007] [Accepted: 08/27/2007] [Indexed: 10/22/2022]
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Abstract
Recent advances in the field of nanotechnology led several groups to recognize the promise of recruiting nanomaterials to the ongoing battle against pathogenic bacteria. A large battery of newly discovered and developed nanomaterials has been accumulating during the last decade, therefore, it could be anticipated that it should only be a matter of time until such preliminary nanomedicine applications are presented. We review some of these pioneering studies in which nanomaterials have been evaluated as potential therapeutics, antiseptics or disinfectants. These studies can be divided roughly into two groups. The first are studies of antibacterial nanomedicines that are based solely on synthetic (artificial) materials. The second group comprises studies of antibacterial nanomaterials that are based on biological substances used in their natural or in a modified form. We will discuss the physicochemical and antibacterial highlights of each material and present the future perspectives of this emerging field.
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Affiliation(s)
- Iftach Yacoby
- Department of Molecular Microbiology & Biotechnology, The George S. Wise Faculty of Life Sciences, Tel-Aviv University, Ramat Aviv 69978, Israel
| | - Itai Benhar
- Department of Molecular Microbiology & Biotechnology, The George S. Wise Faculty of Life Sciences, Tel-Aviv University, Ramat Aviv 69978, Israel
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Blasinska A, Drobnik J. Effects of nonwoven mats of Di-O-butyrylchitin and related polymers on the process of wound healing. Biomacromolecules 2008; 9:776-82. [PMID: 18260635 DOI: 10.1021/bm7006373] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The aim of the study was to observe the effects of dibutyrylchitin (DBC) on the repair processes and to explain the mechanisms of its action in comparison with other dressing materials made of butyrylchitin (BC), regenerated chitin (RC), and chitosan. The results showed that DBC implanted subcutaneously to the rats increased weight of the granulation tissue. Increased cell number isolated from the wound and cultured on the DBC films was also revealed. The DBC was proved to reduce also the necrotic cells number in the culture. DBC elevates the glycosaminoglycans (GAG) level in the granulation tissue. The total collagen content in the wound was not influenced by all applied dressing materials. However, a low level of the poorly polymerized soluble collagen in the wounds treated with DBC and BC indicated better polymerization of the remaining part of that protein. Both DBC and chitosan increased the weight of granulation tissue. However, chitosan contrary to DBC lowered GAG content and increased water capacity in the wound. The study documents the beneficial influence of DBC on the repair, which could be explained by the modification of the extracellular matrix and cells number. The best effects were observed after application of DBC with [eta] DBC-1 = 1.75 dL/g.
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Affiliation(s)
- Anna Blasinska
- Department of Fiber Physics and Textile Metrology, Technical University of Lodz, Zeromskiego 116, 90-924 Lodz, Poland.
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Mano J, Silva G, Azevedo H, Malafaya P, Sousa R, Silva S, Boesel L, Oliveira J, Santos T, Marques A, Neves N, Reis R. Natural origin biodegradable systems in tissue engineering and regenerative medicine: present status and some moving trends. J R Soc Interface 2008; 4:999-1030. [PMID: 17412675 PMCID: PMC2396201 DOI: 10.1098/rsif.2007.0220] [Citation(s) in RCA: 638] [Impact Index Per Article: 39.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
The fields of tissue engineering and regenerative medicine aim at promoting the regeneration of tissues or replacing failing or malfunctioning organs, by means of combining a scaffold/support material, adequate cells and bioactive molecules. Different materials have been proposed to be used as both three-dimensional porous scaffolds and hydrogel matrices for distinct tissue engineering strategies. Among them, polymers of natural origin are one of the most attractive options, mainly due to their similarities with the extracellular matrix (ECM), chemical versatility as well as typically good biological performance. In this review, the most studied and promising and recently proposed naturally derived polymers that have been suggested for tissue engineering applications are described. Different classes of such type of polymers and their blends with synthetic polymers are analysed, with special focus on polysaccharides and proteins, the systems that are more inspired by the ECM. The adaptation of conventional methods or non-conventional processing techniques for processing scaffolds from natural origin based polymers is reviewed. The use of particles, membranes and injectable systems from such kind of materials is also overviewed, especially what concerns the present status of the research that should lead towards their final application. Finally, the biological performance of tissue engineering constructs based on natural-based polymers is discussed, using several examples for different clinically relevant applications.
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Affiliation(s)
- J.F Mano
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Campus de Gualtar4710-057 Braga, Portugal
- IBB—Institute for Biotechnology and Bioengineering4710-057 Braga, Portugal
| | - G.A Silva
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Campus de Gualtar4710-057 Braga, Portugal
- IBB—Institute for Biotechnology and Bioengineering4710-057 Braga, Portugal
| | - H.S Azevedo
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Campus de Gualtar4710-057 Braga, Portugal
- IBB—Institute for Biotechnology and Bioengineering4710-057 Braga, Portugal
| | - P.B Malafaya
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Campus de Gualtar4710-057 Braga, Portugal
- IBB—Institute for Biotechnology and Bioengineering4710-057 Braga, Portugal
| | - R.A Sousa
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Campus de Gualtar4710-057 Braga, Portugal
- IBB—Institute for Biotechnology and Bioengineering4710-057 Braga, Portugal
| | - S.S Silva
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Campus de Gualtar4710-057 Braga, Portugal
- IBB—Institute for Biotechnology and Bioengineering4710-057 Braga, Portugal
| | - L.F Boesel
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Campus de Gualtar4710-057 Braga, Portugal
- IBB—Institute for Biotechnology and Bioengineering4710-057 Braga, Portugal
| | - J.M Oliveira
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Campus de Gualtar4710-057 Braga, Portugal
- IBB—Institute for Biotechnology and Bioengineering4710-057 Braga, Portugal
| | - T.C Santos
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Campus de Gualtar4710-057 Braga, Portugal
- IBB—Institute for Biotechnology and Bioengineering4710-057 Braga, Portugal
| | - A.P Marques
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Campus de Gualtar4710-057 Braga, Portugal
- IBB—Institute for Biotechnology and Bioengineering4710-057 Braga, Portugal
| | - N.M Neves
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Campus de Gualtar4710-057 Braga, Portugal
- IBB—Institute for Biotechnology and Bioengineering4710-057 Braga, Portugal
| | - R.L Reis
- 3B's Research Group—Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Campus de Gualtar4710-057 Braga, Portugal
- IBB—Institute for Biotechnology and Bioengineering4710-057 Braga, Portugal
- Author for correspondence ()
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Zhong Z, Xing R, Liu S, Wang L, Cai S, Li P. Synthesis of acyl thiourea derivatives of chitosan and their antimicrobial activities in vitro. Carbohydr Res 2007; 343:566-70. [PMID: 18083151 DOI: 10.1016/j.carres.2007.11.024] [Citation(s) in RCA: 143] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2007] [Revised: 11/15/2007] [Accepted: 11/25/2007] [Indexed: 10/22/2022]
Abstract
Three different acyl thiourea derivatives of chitosan (CS) were synthesized and their structures were characterized by FT-IR spectroscopy and elemental analysis. The antimicrobial behaviors of CS and its derivatives against four species of bacteria (Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, and Sarcina) and four crop-threatening pathogenic fungi (Alternaria solani, Fusarium oxysporum f. sp. vasinfectum, Colletotrichum gloeosporioides (Penz.) Saec, and Phyllisticta zingiberi) were investigated. The results indicated that the antimicrobial activities of the acyl thiourea derivatives are much better than that of the parent CS. The minimum value of MIC and MBC of the derivatives against E. coli was 15.62 and 62.49 microg/mL, respectively. All of the acyl thiourea derivatives had a significant inhibitory effect on the fungi in concentrations of 50-500 microg/mL; the maximum inhibitory index was 66.67%. The antifungal activities of the chloracetyl thiourea derivatives of CS are noticeably higher than the acetyl and benzoyl thiourea derivatives. The degree of grafting of the acyl thiourea group in the derivatives was related to antifungal activity; higher substitution resulted in stronger antifungal activity.
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Affiliation(s)
- Zhimei Zhong
- Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China.
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65
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Muzzarelli RA, Morganti P, Morganti G, Palombo P, Palombo M, Biagini G, Mattioli Belmonte M, Giantomassi F, Orlandi F, Muzzarelli C. Chitin nanofibrils/chitosan glycolate composites as wound medicaments. Carbohydr Polym 2007. [DOI: 10.1016/j.carbpol.2007.04.008] [Citation(s) in RCA: 202] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Ahmadian G, Degrassi G, Venturi V, Zeigler DR, Soudi M, Zanguinejad P. Bacillus pumilusSG2 isolated from saline conditions produces and secretes two chitinases. J Appl Microbiol 2007; 103:1081-9. [PMID: 17897213 DOI: 10.1111/j.1365-2672.2007.03340.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIMS Isolation and characterization of chitinases from a halotolerant Bacillus pumilus. METHODS AND RESULTS Bacillus pumilus strain SG2 was isolated from saline conditions. It is able to produce chitinase activity at high salt concentration. SDS-PAGE analysis of the B. pumilus SG2 culture supernatant showed two major bands that were induced by chitin. The amino acid sequence of the two proteins, designated ChiS and ChiL, showed a high homology with the chitinase of B. subtilis CHU26, and chitinase A of B. licheniformis, respectively. N-terminal signal peptide of both proteins was also determined. The molecular weight and isoelectric point of the chitinases were determined to be 63 and 74 kDa, and 4.5 and 5.1, for ChiS and ChiL respectively. The genes encoding for both chitinases were isolated and their sequence determined. The regulation of the chitinase genes is under the control of the catabolite repression system. CONCLUSIONS Secreted chitinase genes and their flanking region on the genome of B. pumilus SG2 have been identified and sequenced. SIGNIFICANCE AND IMPACT OF THE STUDY This is the first report of a multiple chitinases-producing B. pumilus halotolerant strain. We have identified two chitinases by using a reverse genetics approach. The chitinases show resistance to salt.
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Affiliation(s)
- G Ahmadian
- Department of Molecular Genetic, National Institute for Genetic Engineering and Biotechnology, Tehran, Iran.
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67
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Nagy V, Seidl V, Szakacs G, Komoń-Zelazowska M, Kubicek CP, Druzhinina IS. Application of DNA bar codes for screening of industrially important fungi: the haplotype of Trichoderma harzianum sensu stricto indicates superior chitinase formation. Appl Environ Microbiol 2007; 73:7048-58. [PMID: 17827332 PMCID: PMC2074977 DOI: 10.1128/aem.00995-07] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Selection of suitable strains for biotechnological purposes is frequently a random process supported by high-throughput methods. Using chitinase production by Hypocrea lixii/Trichoderma harzianum as a model, we tested whether fungal strains with superior enzyme formation may be diagnosed by DNA bar codes. We analyzed sequences of two phylogenetic marker loci, internal transcribed spacer 1 (ITS1) and ITS2 of the rRNA-encoding gene cluster and the large intron of the elongation factor 1-alpha gene, tef1, from 50 isolates of H. lixii/T. harzianum, which were also tested to determine their ability to produce chitinases in solid-state fermentation (SSF). Statistically supported superior chitinase production was obtained for strains carrying one of the observed ITS1 and ITS2 and tef1 alleles corresponding to an allele of T. harzianum type strain CBS 226.95. A tef1-based DNA bar code tool, TrichoCHIT, for rapid identification of these strains was developed. The geographic origin of the strains was irrelevant for chitinase production. The improved chitinase production by strains containing this haplotype was not due to better growth on N-acetyl-beta-D-glucosamine or glucosamine. Isoenzyme electrophoresis showed that neither the isoenzyme profile of N-acetyl-beta-glucosaminidases or the endochitinases nor the intensity of staining of individual chitinase bands correlated with total chitinase in the culture filtrate. The superior chitinase producers did not exhibit similarly increased cellulase formation. Biolog Phenotype MicroArray analysis identified lack of N-acetyl-beta-D-mannosamine utilization as a specific trait of strains with the chitinase-overproducing haplotype. This observation was used to develop a plate screening assay for rapid microbiological identification of the strains. The data illustrate that desired industrial properties may be an attribute of certain populations within a species, and screening procedures should thus include a balanced mixture of all genotypes of a given species.
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Affiliation(s)
- Viviana Nagy
- Department of Agricultural Chemical Technology, Technical University of Budapest, Gellert ter 4, 1111 Budapest, Hungary
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68
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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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69
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Mincheva R, Manolova N, Rashkov I. Bicomponent aligned nanofibers of N-carboxyethylchitosan and poly(vinyl alcohol). Eur Polym J 2007. [DOI: 10.1016/j.eurpolymj.2007.04.020] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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70
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Yates CC, Whaley D, Babu R, Zhang J, Krishna P, Beckman E, Pasculle AW, Wells A. The effect of multifunctional polymer-based gels on wound healing in full thickness bacteria-contaminated mouse skin wound models. Biomaterials 2007; 28:3977-86. [PMID: 17561250 PMCID: PMC2034502 DOI: 10.1016/j.biomaterials.2007.05.008] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2006] [Accepted: 05/18/2007] [Indexed: 11/29/2022]
Abstract
We determined whether a two-part space-conforming polyethylene glycol/dopa polymer-based gel promoted healing of contaminated wounds in mice. This silver-catalysed gel was previously developed to be broadly microbiocidal in vitro while being biocompatible with human wound cell functioning. Full-thickness wounds were created on the backs of mice. The wounds were inoculated with 10(4) CFU of each of four common skin wound contaminants, Staphylococcus aureus, Pseudomonas aeruginosa, Acinetobacter baumanii and Clostridium perfringens. The wounds were then treated with our multifunctional polymer-based gel, the commercially available NewSkin product, or left to heal untreated. The untreated wounds were overtly infected, and presented detectable bacterial loads over the entire 21-day healing period, while the gel and NewSkin groups presented significantly smaller rises in bacterial levels and were cleared of detectable colonies by the third week, with the gel group clearing the bacteria earlier. While all three groups healed their wounds, the polymer-based gel-treated group demonstrated significantly earlier re-epithelialization and dermal maturation (P<0.05). This was reflected in a quick regain of tensile strength. This accelerated dermal maturation and regain in strength was noted in mice treated with the polymer-based gel when compared to wound treated with the commercially available Aquacel-Ag dressing (P<0.05). What distinguishes the polymer-based gel from these other products is that it is incorporated within the healing wound. These preclinical studies show that the anti-microbial polymer gel not only supports but also accelerates healing of bacterially contaminated wounds.
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Affiliation(s)
- Cecelia C Yates
- Department of Pathology, University of Pittsburgh, S713 Scaife Hall, 3550 Terrace Street, Pittsburgh, PA 15261, USA
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71
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Ignatova M, Starbova K, Markova N, Manolova N, Rashkov I. Electrospun nano-fibre mats with antibacterial properties from quaternised chitosan and poly(vinyl alcohol). Carbohydr Res 2006; 341:2098-107. [PMID: 16750180 DOI: 10.1016/j.carres.2006.05.006] [Citation(s) in RCA: 280] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2006] [Revised: 04/19/2006] [Accepted: 05/08/2006] [Indexed: 11/27/2022]
Abstract
Nano-fibres containing quaternised chitosan (QCh) have been successfully prepared by electrospinning of QCh solutions mixed with poly(vinyl alcohol) (PVA). The average fibre diameter is in the range of 60-200 nm. UV irradiation of the composite electrospun nano-fibrous mats containing triethylene glycol diacrylate as cross-linking agent has resulted in stabilising of the nano-fibres against disintegration in water or water vapours. Microbiological screening has demonstrated the antibacterial activity of the photo-cross-linked electrospun mats against Staphylococcus aureus and Escherichia coli. The obtained nano-fibrous electrospun mats are promising for wound-healing applications.
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Affiliation(s)
- Milena Ignatova
- Laboratory of Bioactive Polymers, Institute of Polymers, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Shi C, Zhu Y, Ran X, Wang M, Su Y, Cheng T. Therapeutic potential of chitosan and its derivatives in regenerative medicine. J Surg Res 2006; 133:185-92. [PMID: 16458923 DOI: 10.1016/j.jss.2005.12.013] [Citation(s) in RCA: 291] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2005] [Revised: 11/28/2005] [Accepted: 12/15/2005] [Indexed: 01/21/2023]
Abstract
BACKGROUND Cell-based transplantation, tissue engineering and gene therapy are important therapeutic strategies for present and future regenerative medicine. One challenge is to present the target cells in a suitable matrix to allow the cells to survive the wound contraction, tissue repair, and remodeling in certain tissues. Recently, functional biomaterial research has been directed towards the development of improved scaffolds and new drug delivery systems for regenerative medicine. MATERIALS AND METHODS A literature survey was performed in basic and clinic publications relevant to the therapeutic potential of chitosan and its derivatives in regenerative medicine. In this review the functional properties and potential applications of chitosan and its derivatives in regenerative medicine are presented and discussed. RESULTS Chitosan can be obtained by alkaline deacetylation of chitin and is found to be a natural-based nontoxic, biocompatible, and biodegradable polymer with anti-microbial activity. Chitosan and its derivatives could accelerate wound healing by enhancing the functions of inflammatory cells and repairing cells. Recent studies further indicated that chitosan and its derivatives also are novel scaffold materials for tissue engineering and are-promising non-viral vectors for gene delivery. CONCLUSIONS Regenerative medicine has entered a new era with the development of modern science and technology. The novel properties of chitosan make it a versatile biomaterial for cell therapy, tissue engineering and gene therapy. It is hoped that these diverse approaches for regenerative medicine will translate from "bench to bedside" in the future.
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Affiliation(s)
- Chunmeng Shi
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Combined Injury, College of Preventive Medicine, Third Military Medical University, Chongqing, China.
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