1
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VerHulst EM, Galarza RMR, Herring IP, Ramos RV, Kemper AR. Comparison of conjunctival pedicle flap to corneal fixation strength achieved by Tisseel® fibrin glue, ethyl cyanoacrylate adhesive, ReSure® hydrogel sealant, and conventional suturing with 8-0 VICRYL® ophthalmic suture. Vet Ophthalmol 2024. [PMID: 38529836 DOI: 10.1111/vop.13197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 12/04/2023] [Accepted: 02/11/2024] [Indexed: 03/27/2024]
Abstract
OBJECTIVE To determine and compare the fixation strength of conjunctival pedicle flaps to cornea achieved via conventional ophthalmic suture and three different adhesive compounds. ANIMALS STUDIED Ex vivo porcine globes. PROCEDURES Following a 6 mm wide 500-micron-restricted depth lamellar keratectomy, conjunctival pedicle flaps were secured to the keratectomy site with either 8-0 VICRYL® suture or one of three adhesive products, including Tisseel® bioadhesive, ReSure® synthetic adhesive, or ethyl cyanoacrylate adhesive (n = 10 per surgical group). Adhesive application protocol varied by product based upon adhesive biocompatibility. Corneoconjunctival tissues were then harvested, clamped in a tensile testing device, and loaded at a rate of 1 mm/s under video surveillance until the point of failure. Peak load was determined for each test and used to compare fixation strength between samples. RESULTS Forty conjunctival flaps were performed, with 6 omitted from evaluation due to dehiscence prior to tensile testing. Of the 34 flaps analyzed, 10 were secured with suture, 10 with cyanoacrylate, 8 with ReSure®, and 6 with Tisseel®. Flaps secured with suture withstood significantly higher applied tensile force compared with cyanoacrylate (p = .02474), ReSure® (p = .00000), and Tisseel® (p = .00002). Flaps secured with cyanoacrylate withstood significantly greater force than those secured with ReSure® and Tisseel® (p = .01194 and 0.01798, respectively). There was no significant difference in fixation strength between ReSure® and Tisseel® glue (p = .95675). CONCLUSIONS Conjunctival pedicle flap fixation using 8-0 VICRYL® suture fixation was able to withstand significantly greater maximum tensile force compared to ReSure®, Tisseel®, or cyanoacrylate adhesives. Fixation strength achieved with cyanoacrylate adhesive was significantly greater than that achieved with ReSure® or Tisseel®.
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Affiliation(s)
- Elodie M VerHulst
- Department of Small Animal Clinical Sciences, Virginia Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, Virginia, USA
| | - Roxanne M Rodriguez Galarza
- Department of Small Animal Clinical Sciences, Virginia Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, Virginia, USA
| | - Ian P Herring
- Department of Small Animal Clinical Sciences, Virginia Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, Virginia, USA
| | - Renata Velloso Ramos
- Department of Small Animal Clinical Sciences, Virginia Maryland College of Veterinary Medicine, Virginia Tech, Blacksburg, Virginia, USA
| | - Andrew R Kemper
- Department of Biomedical Engineering and Mechanics, College of Engineering, Virginia Tech, Blacksburg, Virginia, USA
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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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3
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Cook K, Naguib N, Price CE, Katharios S, Kirsch J, Cortes K, Hohl K, O'Toole GA, Grinstaff MW. Temporary In Situ Hydrogel Dressings for Colon Polypectomies. ACS Biomater Sci Eng 2021; 7:4362-4370. [PMID: 34342427 DOI: 10.1021/acsbiomaterials.1c00549] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Currently, no dressings are utilized after removal of polyps during a colonoscopy rendering these tissue sites susceptible to bleeding, sepsis, and perfusion. We report the design specifications, synthesis, and ex vivo evaluation of in situ polymerized hydrogels as colon wound dressings post polypectomy. The hydrogels exhibited varied properties to include moduli between 100 and 16 000 Pa, dissolution times between 4 h to 7 days or longer, swelling up to 200%, and adhesion to colon tissue from 0.1 to 0.4 N/cm2. The hydrogels displayed minimal cytotoxicity, prevented the migration/spread of bacteria, and exhibited rapid gelation, a requirement for application to the lumen of the colon via an endoscope. This work highlights the structure-property relationship of hydrogels prepared from N-hydroxysuccinimide functionalized PEG cross-linkers and hyperbranched polyethylenimines or 4-arm PEG-NH2 star polymers, and their potential as colon wound dressings.
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Affiliation(s)
- Katherine Cook
- Departments of Chemistry, Biomedical Engineering, and Medicine, Boston University, Boston, Massachusetts 02215, United States
| | - Nada Naguib
- Departments of Chemistry, Biomedical Engineering, and Medicine, Boston University, Boston, Massachusetts 02215, United States
| | - Courtney E Price
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire 03755, United States
| | - Stefan Katharios
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire 03755, United States
| | - Jack Kirsch
- Departments of Chemistry, Biomedical Engineering, and Medicine, Boston University, Boston, Massachusetts 02215, United States
| | - Kareen Cortes
- Departments of Chemistry, Biomedical Engineering, and Medicine, Boston University, Boston, Massachusetts 02215, United States
| | - Katherine Hohl
- Departments of Chemistry, Biomedical Engineering, and Medicine, Boston University, Boston, Massachusetts 02215, United States
| | - George A O'Toole
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire 03755, United States
| | - Mark W Grinstaff
- Departments of Chemistry, Biomedical Engineering, and Medicine, Boston University, Boston, Massachusetts 02215, United States
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4
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Chen S, Gil CJ, Ning L, Jin L, Perez L, Kabboul G, Tomov ML, Serpooshan V. Adhesive Tissue Engineered Scaffolds: Mechanisms and Applications. Front Bioeng Biotechnol 2021; 9:683079. [PMID: 34354985 PMCID: PMC8329531 DOI: 10.3389/fbioe.2021.683079] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 06/15/2021] [Indexed: 11/13/2022] Open
Abstract
A variety of suture and bioglue techniques are conventionally used to secure engineered scaffold systems onto the target tissues. These techniques, however, confront several obstacles including secondary damages, cytotoxicity, insufficient adhesion strength, improper degradation rate, and possible allergic reactions. Adhesive tissue engineering scaffolds (ATESs) can circumvent these limitations by introducing their intrinsic tissue adhesion ability. This article highlights the significance of ATESs, reviews their key characteristics and requirements, and explores various mechanisms of action to secure the scaffold onto the tissue. We discuss the current applications of advanced ATES products in various fields of tissue engineering, together with some of the key challenges for each specific field. Strategies for qualitative and quantitative assessment of adhesive properties of scaffolds are presented. Furthermore, we highlight the future prospective in the development of advanced ATES systems for regenerative medicine therapies.
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Affiliation(s)
- Shuai Chen
- Department of Biomedical Engineering, Emory University School of Medicine, Georgia Institute of Technology, Atlanta, GA, United States
| | - Carmen J. Gil
- Department of Biomedical Engineering, Emory University School of Medicine, Georgia Institute of Technology, Atlanta, GA, United States
| | - Liqun Ning
- Department of Biomedical Engineering, Emory University School of Medicine, Georgia Institute of Technology, Atlanta, GA, United States
| | - Linqi Jin
- Department of Biomedical Engineering, Emory University School of Medicine, Georgia Institute of Technology, Atlanta, GA, United States
| | - Lilanni Perez
- Department of Biomedical Engineering, Emory University School of Medicine, Georgia Institute of Technology, Atlanta, GA, United States
| | - Gabriella Kabboul
- Department of Biomedical Engineering, Emory University School of Medicine, Georgia Institute of Technology, Atlanta, GA, United States
| | - Martin L. Tomov
- Department of Biomedical Engineering, Emory University School of Medicine, Georgia Institute of Technology, Atlanta, GA, United States
| | - Vahid Serpooshan
- Department of Biomedical Engineering, Emory University School of Medicine, Georgia Institute of Technology, Atlanta, GA, United States
- Department of Pediatrics, Emory University School of Medicine, Atlanta, GA, United States
- Children’s Healthcare of Atlanta, Atlanta, GA, United States
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5
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Firouzian KF, Song Y, Lin F, Zhang T. Fabrication of a biomimetic spinal cord tissue construct with heterogenous mechanical properties using intrascaffold cell assembly. Biotechnol Bioeng 2020; 117:3094-3107. [PMID: 32542651 DOI: 10.1002/bit.27459] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 06/10/2020] [Accepted: 06/12/2020] [Indexed: 12/27/2022]
Abstract
In tissue engineering studies, scaffolds play a very important role in offering both physical and chemical cues for cell growth and tissue regeneration. However, in some cases, tissue regeneration requires scaffolds with high mechanical properties (e.g., bone and cartilage), while cells need a soft mechanical microenvironment. In this study, to mimic the heterogenous mechanical properties of a spinal cord tissue, a biomimetic rat tissue construct is fabricated. A collagen-coated poly(lactic-co-glycolic acid) scaffold is manufactured using thermally induced phase separation casting. Primary rat neural cells (P01 Wistar rat cortex) with soft hydrogels are later printed within the scaffold using an image-guided intrascaffold cell assembly technique. The scaffolds have unidirectional microporous structure with parallel axial macrochannels (260 ± 4 µm in diameter). Scaffolds showed mechanical properties similar to rat spine (ultimate tensile strength: 0.085 MPa, Young's modulus [stretch]: 0.31 MPa). The bioink composed of gelatin/alginate/fibrinogen is precisely printed into the macrochannels and showed mechanical properties suitable for neural cells (Young's modulus [compressive]: 3.814 kPa). Scaffold interface, cell viability, and immunostaining analyses show uniform distribution of stable, healthy, and elongated neural cells and neurites over 14 culture days in vitro. The results demonstrated that this method can serve as a valuable tool to aid manufacturing of tissue constructs requiring heterogenous mechanical properties for complex cell and/or biomolecule assembly.
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Affiliation(s)
- Kevin F Firouzian
- Department of Mechanical Engineering, Biomanufacturing Center, Tsinghua University, Beijing, China.,Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing, Beijing, China.,Biomanufacturing and Engineering Living Systems, Innovation International Talents Base (111 Base), Beijing, China
| | - Yu Song
- Department of Mechanical Engineering, Biomanufacturing Center, Tsinghua University, Beijing, China.,Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing, Beijing, China.,Biomanufacturing and Engineering Living Systems, Innovation International Talents Base (111 Base), Beijing, China
| | - Feng Lin
- Department of Mechanical Engineering, Biomanufacturing Center, Tsinghua University, Beijing, China.,Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing, Beijing, China.,Biomanufacturing and Engineering Living Systems, Innovation International Talents Base (111 Base), Beijing, China
| | - Ting Zhang
- Department of Mechanical Engineering, Biomanufacturing Center, Tsinghua University, Beijing, China.,Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing, Beijing, China.,Biomanufacturing and Engineering Living Systems, Innovation International Talents Base (111 Base), Beijing, China
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6
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Jung JP, Lin WH, Riddle MJ, Tolar J, Ogle BM. A 3D in vitro model of the dermoepidermal junction amenable to mechanical testing. J Biomed Mater Res A 2018; 106:3231-3238. [PMID: 30208260 PMCID: PMC6283247 DOI: 10.1002/jbm.a.36519] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 07/20/2018] [Accepted: 07/31/2018] [Indexed: 01/06/2023]
Abstract
Recessive dystrophic Epidermolysis Bullosa (RDEB) is caused by mutations in collagen‐type VII gene critical for the dermoepidermal junction (DEJ) formation. Neither tissues of animal models nor currently available in vitro models are amenable to the quantitative assessment of mechanical adhesion between dermal and epidermal layers. Here, we created a 3D in vitro DEJ model using extracellular matrix (ECM) proteins of the DEJ anchored to a poly(ethylene glycol)‐based slab (termed ECM composites) and seeded with human keratinocytes and dermal fibroblasts. Keratinocytes and fibroblasts of healthy individuals were well maintained in the ECM composite and showed the expression of collagen type VII over a 2‐week period. The ECM composites with healthy keratinocytes and fibroblasts exhibited yield stress associated with the separation of the model DEJ at 0.268 ± 0.057 kPa. When we benchmarked this measure of adhesive strength with that of the model DEJ fabricated with cells of individuals with RDEB, the yield stress was significantly lower (0.153 ± 0.064 kPa) consistent with our current mechanistic understanding of RDEB. In summary, a 3D in vitro model DEJ was developed for quantification of mechanical adhesion between epidermal‐ and dermal‐mimicking layers, which can be utilized for assessment of mechanical adhesion of the model DEJ applicable for Epidermolysis Bullosa‐associated therapeutics. © 2018 The Authors. Journal Of Biomedical Materials Research Part A Published By Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 3231–3238, 2018.
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Affiliation(s)
- Jangwook P Jung
- Department of Biomedical Engineering, University of Minnesota-Twin Cities, Minneapolis, Minnesota.,Stem Cell Institute, University of Minnesota-Twin Cities, Minneapolis, Minnesota.,Department of Biological Engineering, Louisiana State University, Baton Rouge, Louisiana
| | - Wei-Han Lin
- Department of Biomedical Engineering, University of Minnesota-Twin Cities, Minneapolis, Minnesota
| | - Megan J Riddle
- Department of Pediatrics, University of Minnesota-Twin Cities, Minneapolis, Minnesota
| | - Jakub Tolar
- Stem Cell Institute, University of Minnesota-Twin Cities, Minneapolis, Minnesota.,Department of Pediatrics, University of Minnesota-Twin Cities, Minneapolis, Minnesota.,Masonic Cancer Center, University of Minnesota-Twin Cities, Minneapolis, Minnesota
| | - Brenda M Ogle
- Department of Biomedical Engineering, University of Minnesota-Twin Cities, Minneapolis, Minnesota.,Stem Cell Institute, University of Minnesota-Twin Cities, Minneapolis, Minnesota.,Masonic Cancer Center, University of Minnesota-Twin Cities, Minneapolis, Minnesota.,Lillehei Heart Institute, University of Minnesota-Twin Cities, Minneapolis, Minnesota.,Institute for Engineering in Medicine, University of Minnesota-Twin Cities, Minneapolis, Minnesota
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7
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Li Z, Zhou F, Li Z, Lin S, Chen L, Liu L, Chen Y. Hydrogel Cross-Linked with Dynamic Covalent Bonding and Micellization for Promoting Burn Wound Healing. ACS APPLIED MATERIALS & INTERFACES 2018; 10:25194-25202. [PMID: 29986126 DOI: 10.1021/acsami.8b08165] [Citation(s) in RCA: 137] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A novel hydrogel (HA-az-F127 hydrogel) formed by reacting hydrazide modified hyaluronic acid (HAAD) and benzaldehyde terminated F127 triblock copolymers (BAF127) was developed in this work. The hydrogel with dynamic covalent chemically and micellar physically double-cross-linked networks exhibited rapid gelation and shear thinning properties. Besides, the hydrogel possessed functions, such as adaptable mechanical strength, self-healability, liquid-absorption, or drainage and tissue adhesion, which are important for wound treatment. Studies on cytocompatibility and histopathology by 3-(4,5-dimethyl-thiazol-2-yl)-2,5-diphenyl tetrazolium bromide tests, live/death staining, and cell counting kit 8 assay demonstrated excellent biocompatibility of the hydrogels. After it was applied in the deep partial-thickness burn model, the hydrogel contributed effectively in promoting burn wound repair. Therefore, the HA-az-F127 hydrogel combined multiple functions in one system, demonstrating potential application in promoting burn wound healing.
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Affiliation(s)
- Ziyi Li
- School of Materials Science and Engineering, Center of Functional Biomaterials, Key Laboratory of Polymeric Composite Materials and Functional Materials of Ministry of Education, GD Research Center for Functional Biomaterials Engineering and Technology , Sun Yat-sen University , Guangzhou 510275 , China
| | - Fei Zhou
- Department of Burns , First Affiliated Hospital of Sun Yat-sen University , Guangzhou 510080 , China
| | - Zhiyong Li
- School of Materials Science and Engineering, Center of Functional Biomaterials, Key Laboratory of Polymeric Composite Materials and Functional Materials of Ministry of Education, GD Research Center for Functional Biomaterials Engineering and Technology , Sun Yat-sen University , Guangzhou 510275 , China
| | - Siyu Lin
- School of Chemistry , Sun Yat-sen University , Guangzhou 510275 , China
| | - Lei Chen
- Department of Burns , First Affiliated Hospital of Sun Yat-sen University , Guangzhou 510080 , China
| | - Lixin Liu
- School of Materials Science and Engineering, Center of Functional Biomaterials, Key Laboratory of Polymeric Composite Materials and Functional Materials of Ministry of Education, GD Research Center for Functional Biomaterials Engineering and Technology , Sun Yat-sen University , Guangzhou 510275 , China
| | - Yongming Chen
- School of Materials Science and Engineering, Center of Functional Biomaterials, Key Laboratory of Polymeric Composite Materials and Functional Materials of Ministry of Education, GD Research Center for Functional Biomaterials Engineering and Technology , Sun Yat-sen University , Guangzhou 510275 , China
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8
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Xu K, Liu Y, Bu S, Wu T, Chang Q, Singh G, Cao X, Deng C, Li B, Luo G, Xing M. Egg Albumen as a Fast and Strong Medical Adhesive Glue. Adv Healthc Mater 2017; 6. [PMID: 28714284 DOI: 10.1002/adhm.201700132] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Revised: 04/20/2017] [Indexed: 11/08/2022]
Abstract
Sutures penetrate tissues to close wounds. This process leads to inflammatory responses, prolongs healing time, and increases operation complexity. It becomes even worse when sutures are applied to stress-sensitive and fragile tissues. By bonding tissues via forming covalent bonds, some medical adhesives are not convenient to be used by surgeons and have side effects to the tissues. Here egg albumen adhesive (EAA) is reported with ultrahigh adhesive strength to bond various types of materials and can be easily used without any chemical and physical modifications. Compared with several commercial medical glues, EAA exhibits stronger adhesive property on porcine skin, glass, polydimethylsiloxane. The EAA also shows exceptional underwater adhesive strength. Finally, wound closure using EAA on poly(caprolactone) nanofibrous sheet and general sutures is investigated and compared in a rat wound model. EAA also does not show strong long-term inflammatory response, suggesting that EAA has potential as a medical glue, considering its abundant source, simple fabrication process, inherent nontoxicity, and low cost.
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Affiliation(s)
- Kaige Xu
- Institute Burn Research; State Key Lab of Trauma, Burns and Combined Injury; Southwest Hospital and Third Military Medical University; Chongqing 400038 China
- Department of Mechanical Engineering; University of Manitoba and Manitoba Institute for Materials; Winnipeg Manitoba R3T 2N2 Canada
| | - Yuqing Liu
- Department of Mechanical Engineering; University of Manitoba and Manitoba Institute for Materials; Winnipeg Manitoba R3T 2N2 Canada
| | - Shousan Bu
- Jiangsu Province Hospital Affiliated with Nanjing Medical University; Nanjing 210029 China
| | - Tianyi Wu
- Jiangsu Province Hospital Affiliated with Nanjing Medical University; Nanjing 210029 China
| | - Qiang Chang
- Institute Burn Research; State Key Lab of Trauma, Burns and Combined Injury; Southwest Hospital and Third Military Medical University; Chongqing 400038 China
- Nanfang Hospital; Southern Medical University; Guangzhou 510515 China
| | - Gurankit Singh
- Institute Burn Research; State Key Lab of Trauma, Burns and Combined Injury; Southwest Hospital and Third Military Medical University; Chongqing 400038 China
| | - Xiaojian Cao
- Jiangsu Province Hospital Affiliated with Nanjing Medical University; Nanjing 210029 China
| | - Chuang Deng
- Department of Mechanical Engineering; University of Manitoba and Manitoba Institute for Materials; Winnipeg Manitoba R3T 2N2 Canada
| | - Bingyun Li
- Department of Orthopedics; West Virginia University; WV 26506-9600 USA
| | - Gaoxing Luo
- Institute Burn Research; State Key Lab of Trauma, Burns and Combined Injury; Southwest Hospital and Third Military Medical University; Chongqing 400038 China
| | - Malcolm Xing
- Institute Burn Research; State Key Lab of Trauma, Burns and Combined Injury; Southwest Hospital and Third Military Medical University; Chongqing 400038 China
- Department of Mechanical Engineering; University of Manitoba and Manitoba Institute for Materials; Winnipeg Manitoba R3T 2N2 Canada
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9
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Kang R, Li H, Lysdahl H, Quang Svend Le D, Chen M, Xie L, Bünger C. Cyanoacrylate medical glue application in intervertebral disc annulus defect repair: Mechanical and biocompatible evaluation. J Biomed Mater Res B Appl Biomater 2015; 105:14-20. [PMID: 26372292 DOI: 10.1002/jbm.b.33524] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Revised: 05/24/2015] [Accepted: 08/30/2015] [Indexed: 12/15/2022]
Abstract
In an attempt to find an ideal closure method during annulus defect repair, we evaluate the use of medical glue by mechanical and biocompatible test. Cyanoacrylate medical glue was applied together with a multilayer microfiber/nanofiber polycaprolactone scaffold and suture in annulus repair. Continuous axial loading and fatigue mechanical test was performed. Furthermore, the in vitro response of mesenchymal stem cell (MSC) to the glue was evaluated by cell viability assay. The in vivo response of annulus tissue to the glue and scaffold was also studied in porcine lumbar spine; histological sections were evaluated after 3 months. Cyanoacrylate glue significantly improved the closure effect in the experimental group with failure load 2825.7 ± 941.6 N, compared to 774.1 ± 281.3 N in the control group without glue application (p < 0.01). The experimental group also withstood the fatigue test. No toxic effect was observed by in vitro cell culture and in vivo implantation. On the basis of this initial evaluation, the use of cyanoacrylate medical glue improves closure effect with no toxicity in annulus defect repair. This method of annulus repair merits further effectiveness study in vivo. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 14-20, 2017.
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Affiliation(s)
- Ran Kang
- Orthopaedic Research Lab, Aarhus University Hospital, Aarhus, C 8000, Denmark.,Department of Orthopedic Surgery, Jiangsu Province Hospital on Integration of Chinese and Western Medicine, Nanjing, 210028, China
| | - Haisheng Li
- Orthopaedic Research Lab, Aarhus University Hospital, Aarhus, C 8000, Denmark
| | - Helle Lysdahl
- Orthopaedic Research Lab, Aarhus University Hospital, Aarhus, C 8000, Denmark
| | - Dang Quang Svend Le
- Orthopaedic Research Lab, Aarhus University Hospital, Aarhus, C 8000, Denmark
| | - Menglin Chen
- Interdisciplinary Nanoscience Center, Aarhus University, Aarhus, C 8000, Denmark
| | - Lin Xie
- Department of Orthopedic Surgery, Jiangsu Province Hospital on Integration of Chinese and Western Medicine, Nanjing, 210028, China
| | - Cody Bünger
- Orthopaedic Research Lab, Aarhus University Hospital, Aarhus, C 8000, Denmark
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10
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Mathes SH, Ruffner H, Graf-Hausner U. The use of skin models in drug development. Adv Drug Deliv Rev 2014; 69-70:81-102. [PMID: 24378581 DOI: 10.1016/j.addr.2013.12.006] [Citation(s) in RCA: 185] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Revised: 12/10/2013] [Accepted: 12/17/2013] [Indexed: 12/12/2022]
Abstract
Three dimensional (3D) tissue models of the human skin are probably the most developed and understood in vitro engineered constructs. The motivation to accomplish organotypic structures was driven by the clinics to enable transplantation of in vitro grown tissue substitutes and by the cosmetics industry as alternative test substrates in order to replace animal models. Today a huge variety of 3D human skin models exist, covering a multitude of scientific and/or technical demands. This review summarizes and discusses different approaches of skin model development and sets them into the context of drug development. Although human skin models have become indispensable for the cosmetics industry, they have not yet started their triumphal procession in pharmaceutical research and development. For drug development these tissue models may be of particular interest for a) systemically acting drugs applied on the skin, and b) drugs acting at the site of application in the case of skin diseases or disorders. Although quite a broad spectrum of models covering different aspects of the skin as a biologically acting surface exists, these are most often single stand-alone approaches. In order to enable the comprehensive application into drug development processes, the approaches have to be synchronized to allow a cross-over comparison. Besides the development of biological relevant models, other issues are not less important in the context of drug development: standardized production procedures, process automation, establishment of significant analytical methods, and data correlation. For the successful routine use of engineered human skin models in drug development, major requirements were defined. If these requirements can be accomplished in the next few years, human organotypic skin models will become indispensable for drug development, too.
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Affiliation(s)
- Stephanie H Mathes
- Institute of Chemistry and Biological Chemistry, Zurich University of Applied Sciences (ZHAW), Einsiedlerstrasse 31, 8820 Waedenswil, Switzerland
| | - Heinz Ruffner
- Developmental and Molecular Pathways (DMP), Novartis Institutes for BioMedical Research (NIBR), Fabrikstrasse 22, 4056 Basel, Switzerland
| | - Ursula Graf-Hausner
- Institute of Chemistry and Biological Chemistry, Zurich University of Applied Sciences (ZHAW), Einsiedlerstrasse 31, 8820 Waedenswil, Switzerland.
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11
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Xiong L, Chui CK, Teo CL, Lau DPC. Modeling and simulation of material degradation in biodegradable wound closure devices. J Biomed Mater Res B Appl Biomater 2014; 102:1181-9. [DOI: 10.1002/jbm.b.33100] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Revised: 11/20/2013] [Accepted: 12/17/2013] [Indexed: 01/13/2023]
Affiliation(s)
- Linfei Xiong
- Department of Mechanical Engineering; National University of Singapore; Singapore Singapore
| | - Chee-Kong Chui
- Department of Mechanical Engineering; National University of Singapore; Singapore Singapore
| | - Chee-Leong Teo
- Department of Mechanical Engineering; National University of Singapore; Singapore Singapore
| | - David P. C. Lau
- Department of Otolaryngology; Raffles Hospital; Singapore Singapore
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12
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Mogal V, Papper V, Chaurasia A, Feng G, Marks R, Steele T. Novel on-demand bioadhesion to soft tissue in wet environments. Macromol Biosci 2013; 14:478-84. [PMID: 24293270 DOI: 10.1002/mabi.201300380] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2013] [Revised: 10/21/2013] [Indexed: 02/06/2023]
Abstract
Current methods of tissue fixation rely on mechanical-related technologies developed from the clothing and carpentry industries. Herein, a novel bioadhesive method that allows tuneable adhesion and is also applicable to biodegradable polyester substrates is described. Diazirine is the key functional group that allows strong soft tissue crosslinking and on-demand adhesion based on a free radical mechanism. Plasma post-irradiation grafting makes it possible to graft diazirine onto PLGA substrates. When the diazirine-PLGA films, placed on wetted ex vivo swine aortas, are activated with low intensity UV light, lap shear strength of up to 450 ± 50 mN cm(-2) is observed, which is one order of magnitude higher than hydrogel bioadhesives placed on similar soft tissues. The diazirine-modified PLGA thin films could be added on top of previously developed technologies for minimally invasive surgeries. The present work is focused on the chemistry, grafting, and lap shear strength of the alkyl diazirine-modified PLGA bioadhesive films.
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Affiliation(s)
- Vishal Mogal
- Materials and Science Engineering, Division of Materials Technology, Nanyang Technological University, Singapore, 639798
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Shin S, Shin JE, Yoo YJ. Attachment of alginate microcapsules onto plasma-treated PDMS sheet for retrieval after transplantation. Biotechnol Appl Biochem 2013; 60:617-22. [PMID: 23668815 DOI: 10.1002/bab.1124] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Accepted: 05/10/2013] [Indexed: 12/17/2022]
Abstract
Although transplantation of microencapsulated islets has been proposed as a therapy for the treatment of diabetes mellitus, limited retrievability of the cells has impeded its medical usage. To achieve retrieval of microencapsulated islets, capsules were attached to polydimethylsiloxane (PDMS) with a biocompatible adhesive. Because the hydrophobic nature of the PDMS surface prevents attachment, surface modification is essential. Alginate microcapsules were attached to modified PDMS sheets, and the mechanical stability of the resulting constructs was determined. Acrylic acid (AA) and acrylamide (AM) mixtures were grafted on the surfaces of PDMS sheets using a two-step oxygen plasma treatment (TSPT). TSPT-PDMS was characterized according to water contact angle and zeta-potential measurements. The contact angle was altered by changing the ratio of AM to AA to generate hydrophilic surface. Evaluation of the surface charge at pH 2, 7, and 12 confirmed the presence of polar groups on the modified surface. Microcapsules were attached to TSPT-PDMS using Histoacryl® and shown to be in a monolayered and half-exposed state. The shear stress resistance of alginate capsules attached to the PDMS sheet indicates the possibility of transplantation of encapsulated cells without scattering in vivo. This method is applicable to retrieve microencapsulated porcine islets when required.
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Affiliation(s)
- Soojeong Shin
- School of Chemical and Biological Engineering, Seoul National University, Seoul, Korea
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