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Silk fibroin based interpenetrating network hydrogel for corneal stromal regeneration. Int J Biol Macromol 2022; 223:583-594. [PMID: 36356877 DOI: 10.1016/j.ijbiomac.2022.11.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 11/02/2022] [Accepted: 11/03/2022] [Indexed: 11/09/2022]
Abstract
There is a need to develop tissue engineering based approaches to address the shortage of donor corneas worldwide for transplantation. To do this a novel approach to fabricate three-dimensional hydrogels using free-radical polymerization was investigated to generate constructs for corneal stromal tissue regeneration. Different ratios of silk fibroin (SF) to polyacrylamide (PA) were used to fabricate semi-interpenetrating hydrogels. Scanning electron micrograph displayed the interconnectivity of pores within the fabricated hydrogels. Pore sizes ranged from 25 to 66 μm. Scaffolds with increasing concentration of SF had enhanced β-sheet structure (verified by Fourier transform infrared spectroscopy). The biological response of human corneal stromal cells to these hydrogels was examined using cellular adhesion, proliferation, cytoskeleton organization, gene expression and immunocytochemical analysis. The fabricated hydrogels possess rapid gelation (∼3 min) at 37 °C, 84 % porosity facilitating keratocyte migration during healing, improved cellular adhesion and no cytotoxicity, indicating their efficiency for in-situ corneal tissue regeneration. Presence of SF in semi-interpenetrating network hydrogel enhanced cellular proliferation, elevated GAG deposition, and increased expression of keratocyte genes, normally associated with healthy corneal stromal tissue. This study acts as an initial step towards fabricating SF based semi-interpenetrating network hydrogels for developing clinically applicable ocular implants.
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2
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Zhong H, Li Z, Zhao T, Chen Y. Surface Modification of Nanofibers by Physical Adsorption of Fiber-Homologous Amphiphilic Copolymers and Nanofiber-Reinforced Hydrogels with Excellent Tissue Adhesion. ACS Biomater Sci Eng 2021; 7:4828-4837. [PMID: 34478620 DOI: 10.1021/acsbiomaterials.1c00982] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Herein, we report a simple approach to modify hydrophobic PCL nanofibers by adsorption of a fiber-homologous amphiphilic triblock copolymer (PCL-b-PEG-b-PCL, PCEC). The modified PCL nanofibers were then utilized to reinforce a physical hydrogel, which was formed by micellar crosslinking of the same PCEC triblock copolymer. Therefore, the copolymer played a dual role in not only dispersing and stabilizing nanofibers but also additionally providing a framework for the hydrogel matrix. The mechanical strength of the hydrogel was significantly enhanced by addition of the modified PCL nanofibers, and the gel modulus can be tuned by varying the concentration of the copolymer and nanofibers. The effect of nanofiber size and content on the mechanical properties of the hydrogel matrices was studied. Different from hydrogel composites that were reinforced by 2D fiber meshes or 3D woven fiber networks, this free fiber-reinforced hydrogel can be readily injected to adapt to the environmental shape and self-heal. The hydrogel composites showed superior tissue adhesion properties compared to the commercially available fibrin glue, especially in muscle adhesion. Due to its injectable and self-healing properties, this nanofiber-reinforced hydrogel may have great potential as a new type of tissue sealant.
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Affiliation(s)
- Hai Zhong
- School of Materials Science and Engineering, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Sun Yat-sen University, Guangzhou 510275, China
| | - Zhiyong Li
- Nepgel Chemical Co., Ltd., No. 127, China South-City Industrial Zone, Longgang District, Shenzhen 518111, China
| | - Tianyu Zhao
- School of Materials Science and Engineering, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Sun Yat-sen University, Guangzhou 510275, China
| | - Yongming Chen
- School of Materials Science and Engineering, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Sun Yat-sen University, Guangzhou 510275, China
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Chen J, Nichols BLB, Norris AM, Frazier CE, Edgar KJ. All-Polysaccharide, Self-Healing Injectable Hydrogels Based on Chitosan and Oxidized Hydroxypropyl Polysaccharides. Biomacromolecules 2020; 21:4261-4272. [PMID: 32809805 DOI: 10.1021/acs.biomac.0c01046] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Polysaccharide-based hydrogels are attractive materials for biomedical applications for reasons that include their polyfunctionality, generally benign nature, and biodegradability. However, the use of polysaccharide-based hydrogels may be limited by toxicity arising from small-molecule crosslinkers, or may involve undesired chemical modification [Hennink, W. E.; et al. Adv. Drug Delivery Rev. 2012, 64, 223-236]. Here, we report a green, simple, efficient strategy for the preparation of polysaccharide-based, in situ forming hydrogels. The Edgar group reports in the accompanying manuscript that chemoselective oxidation of oligo(hydroxypropyl)-substituted polysaccharides introduces ketone groups at the termini of the side chains [Nichols, B. L. B.; et al]. Amine-containing moieties can condense with ketones to form imines. The imine linkage is dynamic in the presence of water, providing the potential for self-healing [Wei, Z.; et al. Adv. Funct. Mater. 2015, 25, 1352-1359], injectability [Wei, Z.; et al. Adv. Funct. Mater. 2015, 25, 1352-1359], and pH responsiveness [Yao, K.; et al. J. Appl. Polym. Sci. 1993, 48, 343-354]. In this work, we designed and prepared two different types of hydrogels, oxidized hydroxypropyl cellulose/chitosan (Ox-HPC-Chitosan) and oxidized hydroxypropyl dextran/chitosan (Ox-HPD-Chitosan), each cross-linked by imine bonds. The mechanical properties of these hydrogels were characterized by rheometry, revealing that hydrogel storage modulus could be tuned from 300 Pa to 13 kPa simply by controlling the degree of substitution (DS) of ketone groups. Rheological characterization also illustrated the rapid self-healing property of these all-polysaccharide hydrogels. Moreover, these hydrogels exhibited high swelling rates and facile injectability. Therefore, this work reveals a potential strategy for the construction of hydrogels that require no small-molecule crosslinkers and are therefore highly attractive for biomedical, agricultural, controlled release, and other applications.
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Affiliation(s)
- Junyi Chen
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Brittany L B Nichols
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Ann M Norris
- Department of Sustainable Biomaterials, Virginia Tech, Blacksburg, Virginia 24061, United States.,Macromolecules Innovation Institute, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Charles E Frazier
- Department of Sustainable Biomaterials, Virginia Tech, Blacksburg, Virginia 24061, United States.,Macromolecules Innovation Institute, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Kevin J Edgar
- Department of Sustainable Biomaterials, Virginia Tech, Blacksburg, Virginia 24061, United States.,Macromolecules Innovation Institute, Virginia Tech, Blacksburg, Virginia 24061, United States
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Bakshi PS, Selvakumar D, Kadirvelu K, Kumar N. Chitosan as an environment friendly biomaterial – a review on recent modifications and applications. Int J Biol Macromol 2020; 150:1072-1083. [DOI: 10.1016/j.ijbiomac.2019.10.113] [Citation(s) in RCA: 316] [Impact Index Per Article: 79.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 10/09/2019] [Accepted: 10/10/2019] [Indexed: 12/12/2022]
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Abstract
Hemorrhage is the leading cause of preventable death in combat trauma and the secondary cause of death in civilian trauma. A significant number of deaths due to hemorrhage occur before and in the first hour after hospital arrival. A literature search was performed through PubMed, Scopus, and Institute of Scientific Information databases for English language articles using terms relating to hemostatic agents, prehospital, battlefield or combat dressings, and prehospital hemostatic resuscitation, followed by cross-reference searching. Abstracts were screened to determine relevance and whether appropriate further review of the original articles was warranted. Based on these findings, this paper provides a review of a variety of hemostatic agents ranging from clinically approved products for human use to newly developed concepts with great potential for use in prehospital settings. These hemostatic agents can be administered either systemically or locally to stop bleeding through different mechanisms of action. Comparisons of current hemostatic products and further directions for prehospital hemorrhage control are also discussed.
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Affiliation(s)
- Henry T Peng
- Defence Research and Development Canada, Toronto Research Centre, 1133 Sheppard Avenue West, Toronto, ON, M3K 2C9, Canada.
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Luo JW, Liu C, Wu JH, Lin LX, Fan HM, Zhao DH, Zhuang YQ, Sun YL. In situ injectable hyaluronic acid/gelatin hydrogel for hemorrhage control. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 98:628-634. [DOI: 10.1016/j.msec.2019.01.034] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 12/23/2018] [Accepted: 01/08/2019] [Indexed: 12/26/2022]
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Cohn D, Sloutski A, Elyashiv A, Varma VB, Ramanujan R. In Situ Generated Medical Devices. Adv Healthc Mater 2019; 8:e1801066. [PMID: 30828989 DOI: 10.1002/adhm.201801066] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 11/25/2018] [Indexed: 12/19/2022]
Abstract
Medical devices play a major role in all areas of modern medicine, largely contributing to the success of clinical procedures and to the health of patients worldwide. They span from simple commodity products such as gauzes and catheters, to highly advanced implants, e.g., heart valves and vascular grafts. In situ generated devices are an important family of devices that are formed at their site of clinical function that have distinct advantages. Among them, since they are formed within the body, they only require minimally invasive procedures, avoiding the pain and risks associated with open surgery. These devices also display enhanced conformability to local tissues and can reach sites that otherwise are inaccessible. This review aims at shedding light on the unique features of in situ generated devices and to underscore leading trends in the field, as they are reflected by key developments recently in the field over the last several years. Since the uniqueness of these devices stems from their in situ generation, the way they are formed is crucial. It is because of this fact that in this review, the medical devices are classified depending on whether their in situ generation entails chemical or physical phenomena.
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Affiliation(s)
- Daniel Cohn
- Casali Center of Applied ChemistryInstitute of ChemistryHebrew University of Jerusalem Jerusalem 91904 Israel
| | - Aaron Sloutski
- Casali Center of Applied ChemistryInstitute of ChemistryHebrew University of Jerusalem Jerusalem 91904 Israel
| | - Ariel Elyashiv
- Casali Center of Applied ChemistryInstitute of ChemistryHebrew University of Jerusalem Jerusalem 91904 Israel
| | - Vijaykumar B. Varma
- School of Materials Science and EngineeringNanyang Technological University 639798 Singapore Singapore
| | - Raju Ramanujan
- School of Materials Science and EngineeringNanyang Technological University 639798 Singapore Singapore
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Synthetic anionic surfaces can replace microparticles in stimulating burst coagulation of blood plasma. Colloids Surf B Biointerfaces 2019; 175:596-605. [DOI: 10.1016/j.colsurfb.2018.11.066] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 10/23/2018] [Accepted: 11/26/2018] [Indexed: 12/23/2022]
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Morozowich NL, Nichol JL, Allcock HR. Hydrogels based on schiff base formation between an amino-containing polyphosphazene and aldehyde functionalized-dextrans. ACTA ACUST UNITED AC 2016. [DOI: 10.1002/pola.28184] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Nicole L. Morozowich
- Department of Chemistry; the Pennsylvania State University, University Park; Pennsylvania 16802
| | - Jessica L. Nichol
- Department of Chemistry; the Pennsylvania State University, University Park; Pennsylvania 16802
| | - Harry R. Allcock
- Department of Chemistry; the Pennsylvania State University, University Park; Pennsylvania 16802
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Ghosh S, Cabral JD, Hanton LR, Moratti SC. Strong poly(ethylene oxide) based gel adhesives via oxime cross-linking. Acta Biomater 2016; 29:206-214. [PMID: 26476342 DOI: 10.1016/j.actbio.2015.10.018] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Revised: 09/28/2015] [Accepted: 10/13/2015] [Indexed: 01/08/2023]
Abstract
There is a demand for materials to replace or augment the use of sutures and staples in surgical procedures. Currently available commercial surgical adhesives provide either high bond strength with biological toxicity or polymer and protein-based products that are biologically acceptable (though with potential sensitizing potential) but have much reduced bond strength. It is desirable to provide novel biocompatible and biodegradable surgical adhesives/sealants capable of high strength with minimal immune or inflammatory response. In this work, we report the end group derivatization of 8-arm star PEOs with aldehyde and amine end groups. Gels were prepared employing the Schiff-base chemistry between the aldehydes and the amines. Gel setting times, swelling behavior and rheological characterization were carried out for these gels. The mechanical-viscoelastic properties were found to be directly proportional to the crosslinking density of the gels, the 10K PEO gel was stiffer in comparison to the 20K PEO gel. The adhesive properties of these gels were tested using porcine skin and showed excellent adhesion properties. Cytotoxicity studies were carried out for the individual gel components using two different methods: (a) Crystal Violet Staining assay (CVS assay) and (b) impedance and cell index measurement by the xCELLigence system at concentrations >5%. Gels prepared by mixing 20% w/w solutions were also tested for cytotoxicity. The results revealed that the individual gel components as well as the prepared gels and their leachables were non-cytotoxic at these concentrations. STATEMENT OF SIGNIFICANCE This work presents a new type of glue that is aimed at surgery applications using a water soluble star shaped polymer. It show excellent adhesion to skin and is tough and easy to use. We show that it is very biocompatible based on tests on live human cells, and could therefore in principle be used for internal surgery. Comparison with other reported and commercial glues shows that it is stronger than most, and does not swell in water to the same degree as many other water based bioadhesives.
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Physical properties and biocompatibility of oligochitosan membrane film as wound dressing. J Appl Biomater Funct Mater 2014; 12:155-62. [PMID: 24700269 DOI: 10.5301/jabfm.5000190] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/07/2013] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND The physical and biological characteristics of oligochitosan (O-C) film, including its barrier and mechanical properties, in vitro cytotoxicity and in vivo biocompatibility, were studied to assess its potential use as a wound dressing. METHODS Membrane films were prepared from water-soluble O-C solution blended with various concentrations of glycerol to modify the physical properties of the films. In vitro and in vivo biocompatibility evaluations were performed using primary human skin fibroblast cultures and subcutaneous implantation in a rat model, respectively. RESULTS Addition of glycerol significantly influenced the barrier and mechanical properties of the films. Water absorption capacity was in the range of 80%-160%, whereas water vapor transmission rate varied from 1,180 to 1,618 g/m2 per day. Both properties increased with increasing glycerol concentration. Tensile strength decreased while elongation at break increased with the addition of glycerol. O-C films were found to be noncytotoxic to human fibroblast cultures and histological examination proved that films are biocompatible. CONCLUSION These results indicate that the membrane film from O-C has potential application as a wound-dressing material.
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12
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Wang Z, Zhang Y, Zhang J, Huang L, Liu J, Li Y, Zhang G, Kundu SC, Wang L. Exploring natural silk protein sericin for regenerative medicine: an injectable, photoluminescent, cell-adhesive 3D hydrogel. Sci Rep 2014; 4:7064. [PMID: 25412301 PMCID: PMC4238302 DOI: 10.1038/srep07064] [Citation(s) in RCA: 143] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Accepted: 10/13/2014] [Indexed: 12/22/2022] Open
Abstract
Sericin, a major component of silk, has a long history of being discarded as a waste during silk processing. The value of sericin for tissue engineering is underestimated and its potential application in regenerative medicine has just begun to be explored. Here we report the successful fabrication and characterization of a covalently-crosslinked 3D pure sericin hydrogel for delivery of cells and drugs. This hydrogel is injectable, permitting its implantation through minimally invasive approaches. Notably, this hydrogel is found to exhibit photoluminescence, enabling bioimaging and in vivo tracking. Moreover, this hydrogel system possesses excellent cell-adhesive capability, effectively promoting cell attachment, proliferation and long-term survival of various types of cells. Further, the sericin hydrogel releases bioactive reagents in a sustained manner. Additionally, this hydrogel demonstrates good elasticity, high porosity, and pH-dependent degradation dynamics, which are advantageous for this sericin hydrogel to serve as a delivery vehicle for cells and therapeutic drugs. With all these unique features, it is expected that this sericin hydrogel will have wide utility in the areas of tissue engineering and regenerative medicine.
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Affiliation(s)
- Zheng Wang
- Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei China 430022
- Department of Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei China 430022
| | - Yeshun Zhang
- Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei China 430022
| | - Jinxiang Zhang
- Department of Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei China 430022
| | - Lei Huang
- Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei China 430022
| | - Jia Liu
- Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei China 430022
| | - Yongkui Li
- Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei China 430022
| | - Guozheng Zhang
- The Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang, Jiangsu China 212018
| | - Subhas C. Kundu
- Department of Biotechnology, Indian Institute of Technology, Kharagpur, India 721302
| | - Lin Wang
- Center for Tissue Engineering and Regenerative Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei China 430022
- Medical Research Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei China 430022
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Skop NB, Calderon F, Cho CH, Gandhi CD, Levison SW. Improvements in biomaterial matrices for neural precursor cell transplantation. MOLECULAR AND CELLULAR THERAPIES 2014; 2:19. [PMID: 26056586 PMCID: PMC4452047 DOI: 10.1186/2052-8426-2-19] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Accepted: 06/05/2014] [Indexed: 12/24/2022]
Abstract
Progress is being made in developing neuroprotective strategies for traumatic brain injuries; however, there will never be a therapy that will fully preserve neurons that are injured from moderate to severe head injuries. Therefore, to restore neurological function, regenerative strategies will be required. Given the limited regenerative capacity of the resident neural precursors of the CNS, many investigators have evaluated the regenerative potential of transplanted precursors. Unfortunately, these precursors do not thrive when engrafted without a biomaterial scaffold. In this article we review the types of natural and synthetic materials that are being used in brain tissue engineering applications for traumatic brain injury and stroke. We also analyze modifications of the scaffolds including immobilizing drugs, growth factors and extracellular matrix molecules to improve CNS regeneration and functional recovery. We conclude with a discussion of some of the challenges that remain to be solved towards repairing and regenerating the brain.
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Affiliation(s)
- Nolan B Skop
- Department of Neurology & Neurosciences, Rutgers University-New Jersey Medical School, NJMS-Cancer Center, H-1226, 205 South Orange Ave., Newark, NJ 07103 USA ; Department of Biomedical Engineering, New Jersey Institute of Technology, Newark, NJ 07102 USA
| | - Frances Calderon
- Department of Neurology & Neurosciences, Rutgers University-New Jersey Medical School, NJMS-Cancer Center, H-1226, 205 South Orange Ave., Newark, NJ 07103 USA
| | - Cheul H Cho
- Department of Biomedical Engineering, New Jersey Institute of Technology, Newark, NJ 07102 USA
| | - Chirag D Gandhi
- Department of Neurology & Neurosciences, Rutgers University-New Jersey Medical School, NJMS-Cancer Center, H-1226, 205 South Orange Ave., Newark, NJ 07103 USA ; Department of Neurological Surgery, Rutgers University-New Jersey Medical School, New Jersey Medical School, Newark, NJ 07103 USA
| | - Steven W Levison
- Department of Neurology & Neurosciences, Rutgers University-New Jersey Medical School, NJMS-Cancer Center, H-1226, 205 South Orange Ave., Newark, NJ 07103 USA
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14
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Peng HT, Shek PN. Novel wound sealants: biomaterials and applications. Expert Rev Med Devices 2014; 7:639-59. [DOI: 10.1586/erd.10.40] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Behrens AM, Sikorski MJ, Kofinas P. Hemostatic strategies for traumatic and surgical bleeding. J Biomed Mater Res A 2013; 102:4182-94. [PMID: 24307256 DOI: 10.1002/jbm.a.35052] [Citation(s) in RCA: 170] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Revised: 11/18/2013] [Accepted: 12/02/2013] [Indexed: 12/23/2022]
Abstract
Wide interest in new hemostatic approaches has stemmed from unmet needs in the hospital and on the battlefield. Many current commercial hemostatic agents fail to fulfill the design requirements of safety, efficacy, cost, and storage. Academic focus has led to the improvement of existing strategies as well as new developments. This review will identify and discuss the three major classes of hemostatic approaches: biologically derived materials, synthetically derived materials, and intravenously administered hemostatic agents. The general class is first discussed, then specific approaches discussed in detail, including the hemostatic mechanisms and the advancement of the method. As hemostatic strategies evolve and synthetic-biologic interactions are more fully understood, current clinical methodologies will be replaced.
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Affiliation(s)
- Adam M Behrens
- Fischell Department of Bioengineering, University of Maryland, 2330 Jeong H. Kim Engineering Building, College Park, Maryland, 20742
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Song K, Liu Y, Macedo HM, Jiang L, Li C, Mei G, Liu T. Fabrication and evaluation of a sustained-release chitosan-based scaffold embedded with PLGA microspheres. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:1506-13. [DOI: 10.1016/j.msec.2012.12.054] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2012] [Revised: 11/07/2012] [Accepted: 12/17/2012] [Indexed: 12/22/2022]
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17
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Oh DX, Hwang DS. A biomimetic chitosan composite with improved mechanical properties in wet conditions. Biotechnol Prog 2013; 29:505-12. [DOI: 10.1002/btpr.1691] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Revised: 12/17/2012] [Indexed: 11/07/2022]
Affiliation(s)
- Dongyeop X. Oh
- POSTECH Ocean Science and Technology Institute; Pohang University of Science and Technology (POSTECH); Pohang 790-784 South Korea
| | - Dong Soo Hwang
- POSTECH Ocean Science and Technology Institute; Pohang University of Science and Technology (POSTECH); Pohang 790-784 South Korea
- School of Environmental Science and Engineering; Pohang University of Science and Technology (POSTECH); Pohang 790-784 South Korea
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18
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Silk sericin/polyacrylamide in situ forming hydrogels for dermal reconstruction. Biomaterials 2012; 33:7456-67. [PMID: 22819495 DOI: 10.1016/j.biomaterials.2012.06.091] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Accepted: 06/26/2012] [Indexed: 11/22/2022]
Abstract
In situ forming tissue sealants are advantageous due to ease in application, complete coverage of defect site and assured comfort levels to patients. The interconnected three-dimensional hydrophilic networks perfectly manage typical dermal wounds by suitably scaffolding skin fibroblast, diffusing the nutrients, therapeutics and exudates while still maintaining an adequately moist environment. We evaluate the cell homing ability of semi-interpenetrating non-mulberry tropical tasar silk sericin/polyacrylamide hydrophilic network with a keen understanding of its network characteristics and correlation of protein concentration with the performance as cell scaffold. Interconnectivity of porous networks observed through scanning electron micrograph revealed pore sizes ranging from 23 to 52 μm. The enhanced β-sheet content with the increasing sericin concentration in far red spectroscopy study supported their corresponding improved compressive strength. These semi-interpenetrating networks were found to possess a maximum fluid uptake of 112% of its weight, hence preventing the accumulation of exudates at the wound area. The present systems appear to possess characteristics like rapid gelation (~5min) at 37 °C, 98% porosity enabling the migration of fibroblasts during healing (observed through confocal and scanning electron micrographs), cell adhesion together with the absence of any cyto-toxic effect suggesting its potential as in situ tissue sealants. The compressive strength up to 61 kPa ensured ease in handling even when wet. The results prove the suitability to use non-mulberry tasar cocoon silk sericin/polyacrylamide semi-interpenetrating network as a reconstructive dermal sealant.
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Zhang H, Betz A, Qadeer A, Attinger D, Chen W. Microfluidic formation of monodispersed spherical microgels composed of triple-network crosslinking. J Appl Polym Sci 2011. [DOI: 10.1002/app.34001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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20
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Mohanan PV, Mavely L, Pandya A. Toxicity and hemostatic potential of poly [ß-(1, 4)-2-amino-2-deoxy-D-glucosamine] based hemostatic material on albino rabbits. Toxicol Mech Methods 2010; 21:25-30. [DOI: 10.3109/15376516.2010.529185] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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21
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Zhang J, Xia W, Liu P, Cheng Q, Tahirou T, Gu W, Li B. Chitosan modification and pharmaceutical/biomedical applications. Mar Drugs 2010; 8:1962-87. [PMID: 20714418 PMCID: PMC2920537 DOI: 10.3390/md8071962] [Citation(s) in RCA: 297] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2010] [Revised: 05/29/2010] [Accepted: 06/09/2010] [Indexed: 11/23/2022] Open
Abstract
Chitosan has received much attention as a functional biopolymer for diverse applications, especially in pharmaceutics and medicine. Our recent efforts focused on the chemical and biological modification of chitosan in order to increase its solubility in aqueous solutions and absorbability in the in vivo system, thus for a better use of chitosan. This review summarizes chitosan modification and its pharmaceutical/biomedical applications based on our achievements as well as the domestic and overseas developments: (1) enzymatic preparation of low molecular weight chitosans/chitooligosaccharides with their hypocholesterolemic and immuno-modulating effects; (2) the effects of chitin, chitosan and their derivatives on blood hemostasis; and (3) synthesis of a non-toxic ion ligand--D-Glucosaminic acid from oxidation of D-Glucosamine for cancer and diabetes therapy.
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Affiliation(s)
- Jiali Zhang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, 214122, Jiangsu, China
- School of Medicine and Pharmaceutics, Jiangnan University, Wuxi 214122, Jiangsu, China
| | - Wenshui Xia
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, 214122, Jiangsu, China
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, Jiangsu, China
| | - Ping Liu
- Jiangsu Animal Husbandry and Veterinary College, Taizhou 225300, Jiangsu, China
| | - Qinyuan Cheng
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, 214122, Jiangsu, China
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, Jiangsu, China
| | - Talba Tahirou
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, 214122, Jiangsu, China
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, Jiangsu, China
| | - Wenxiu Gu
- School of Chemical Engineering, Jiangnan University, Wuxi 214122, China
| | - Bo Li
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, 214122, Jiangsu, China
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, Jiangsu, China
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