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Rodriguez-Rivera GJ, Green M, Shah V, Leyendecker K, Cosgriff-Hernandez E. A user's guide to degradation testing of polyethylene glycol-based hydrogels: From in vitro to in vivo studies. J Biomed Mater Res A 2024; 112:1200-1212. [PMID: 37715481 DOI: 10.1002/jbm.a.37609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 08/21/2023] [Accepted: 08/29/2023] [Indexed: 09/17/2023]
Abstract
Poly(ethylene glycol) (PEG)-based hydrogels have gained significant attention in the field of biomedical applications due to their versatility and antifouling properties. Acrylate-derivatized PEG hydrogels (PEGDA) are some of the most widely studied hydrogels; however, there has been debate around the degradation mechanism and predicting resorption rates. Several factors influence the degradation rate of PEG hydrogels, including backbone and endgroup chemistry, macromer molecular weight, and polymer concentration. In addition to hydrogel parameters, it is necessary to understand the influence of biological and environmental conditions (e.g., pH and temperature) on hydrogel degradation. Rigorous methods for monitoring degradation in both in vitro and in vivo settings are also critical to hydrogel design and development. Herein, we provide guidance on tailoring PEG hydrogel chemistry to achieve target hydrolytic degradation kinetics for both resorbable and biostable applications. A detailed overview of accelerated testing methods and hydrogel degradation characterization is provided to aid researchers in experimental design and interpreting in vitro-in vivo correlations necessary for predicting hydrogel device performance.
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Affiliation(s)
| | - Mykel Green
- Department of Biomedical Engineering, The University of Texas, Austin, Texas, USA
| | - Vani Shah
- Department of Biomedical Engineering, The University of Texas, Austin, Texas, USA
| | - Kathleen Leyendecker
- Department of Mechanical Engineering, The University of Texas, Austin, Texas, USA
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2
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Lekkala S, Inverardi N, Grindy SC, Hugard S, Muratoglu OK, Oral E. Irradiation Behavior of Analgesic and Nonsteroidal Anti-Inflammatory Drug-Loaded UHMWPE for Joint Replacement. Biomacromolecules 2024; 25:2312-2322. [PMID: 38456765 DOI: 10.1021/acs.biomac.3c01179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2024]
Abstract
Local delivery of pain medication can be a beneficial strategy to address pain management after joint replacement, as it can decrease systemic opioid usage, leading to less side and long-term effects. In this study, we used ultrahigh molecular weight polyethylene (UHMWPE), commonly employed as a bearing material for joint implants, to deliver a wide set of analgesics and the nonsteroidal anti-inflammatory drug tolfenamic acid. We blended the drugs with UHMWPE and processed the blend by compression molding and sterilization by low-dose gamma irradiation. We studied the chemical stability of the eluted drugs, drug elution, tensile properties, and wear resistance of the polymer blends before and after sterilization. The incorporation of bupivacaine hydrochloride and tolfenamic acid in UHMWPE resulted in either single- or dual-drug loaded materials that can be sterilized by gamma irradiation. These compositions were found to be promising for the development of clinically relevant drug-eluting implants for joint replacement.
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Affiliation(s)
- Sashank Lekkala
- Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts 02114, United States
| | - Nicoletta Inverardi
- Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts 02114, United States
- Department of Orthopaedic Surgery, Harvard Medical School, Boston, Massachusetts 02114, United States
| | - Scott C Grindy
- Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts 02114, United States
- Department of Orthopaedic Surgery, Harvard Medical School, Boston, Massachusetts 02114, United States
| | - Shannon Hugard
- Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts 02114, United States
| | - Orhun K Muratoglu
- Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts 02114, United States
- Department of Orthopaedic Surgery, Harvard Medical School, Boston, Massachusetts 02114, United States
| | - Ebru Oral
- Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, Massachusetts 02114, United States
- Department of Orthopaedic Surgery, Harvard Medical School, Boston, Massachusetts 02114, United States
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3
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Miller Naranjo B, Zollo M, Sieber SA, Lieleg O. Lubricity, wear prevention, and anti-biofouling properties of macromolecular coatings for endotracheal tubes. Biomater Sci 2024; 12:1228-1238. [PMID: 38230671 DOI: 10.1039/d3bm01985c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
Macromolecular coatings can improve the surface properties of many medical devices by enhancing their wetting behavior, tribological performance, and anti-biofouling properties - and covalent coatings produced from mucin glycoproteins have been shown to be very powerful in all those aspects. However, obtaining highly functional mucin glycoproteins is, at the moment, still a time-consuming process, which renders mucins rather expensive compared to other biomacromolecules. Here, we study a set of commercially available macromolecules that have the potential of substituting mucins in coatings for endotracheal tubes (ETTs). We present an overview of the different properties these macromolecular coatings establish on the ETT surface and whether they withstand storage or sterilization processes. Our study pinpoints several strategies of how to enhance the lubricity of ETTs by applying macromolecular coatings but also demonstrates the limited anti-biofouling abilities of well-established macromolecules such as hyaluronic acid, polyethylene glycol, and dextran. Based on the obtained results, we discuss to what extent those coatings can be considered equivalent alternatives to mucin coatings for applications on medical devices - their applicability does not have to be limited to ETTs, but could be broadened to catheters and endoscopes as well.
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Affiliation(s)
- Bernardo Miller Naranjo
- TUM School of Engineering and Design Department of Materials Engineering, Technical University of Munich (TUM), Boltzmannstraße 15, 85748 Garching, Germany.
- Center for Protein Assemblies (CPA) and Munich Institute of Biomedical Engineering (MIBE), Technical University of Munich (TUM), Ernst-Otto-Fischer Straße 8, 85748 Garching, Germany
| | - Michael Zollo
- TUM School of Natural Sciences, Department of Bioscience, Chair of Organic Chemistry II Center for Functional Protein Assemblies (CPA), Technical University of Munich (TUM), Ernst-Otto-Fischer-Str. 8, Garching 85748, Germany
| | - Stephan A Sieber
- TUM School of Natural Sciences, Department of Bioscience, Chair of Organic Chemistry II Center for Functional Protein Assemblies (CPA), Technical University of Munich (TUM), Ernst-Otto-Fischer-Str. 8, Garching 85748, Germany
| | - Oliver Lieleg
- TUM School of Engineering and Design Department of Materials Engineering, Technical University of Munich (TUM), Boltzmannstraße 15, 85748 Garching, Germany.
- Center for Protein Assemblies (CPA) and Munich Institute of Biomedical Engineering (MIBE), Technical University of Munich (TUM), Ernst-Otto-Fischer Straße 8, 85748 Garching, Germany
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4
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Karamchedu NP, Fleming BC, Proffen BL, Sant NJ, Portilla G, Parola LR, Molino J, Murray MM. Terminal sterilization influences the efficacy of an extracellular matrix-blood composite for treating posttraumatic osteoarthritis in the rat model. J Orthop Res 2022; 40:573-583. [PMID: 33913543 PMCID: PMC8553815 DOI: 10.1002/jor.25056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 01/21/2021] [Accepted: 04/12/2021] [Indexed: 02/04/2023]
Abstract
The objective was to determine if an intra-articular injection of an extracellular matrix (ECM) powder and blood composite (ECM-B) after anterior cruciate ligament (ACL) injury would have a mitigating effect on posttraumatic osteoarthritis and if that effect would be different with terminal sterilization of the ECM powder before use. Eighty Lewis rats underwent ACL transection and were divided into four groups: (1) intra-articular injection with phosphate-buffered saline (PBS; n = 20), (2) intra-articular injection of ECM-B using aseptically processed ECM (ASEPTIC; n = 20), (3) intra-articular injection of the ECM-busing ECM powder sterilized with 15 kGy electron beam irradiation (EBEAM; n = 20), and (4) intra-articular injection of the ECM-B using ECM powder sterilized with ethylene oxide (EO; n = 20). Twenty additional animals received capsulotomy only (SHAM). The animals were followed for 6 weeks and evaluations of gait, radiographs, and joint cartilage histology were performed. At 6 weeks, when compared to the SHAM group, the group treated with PBS had significantly worse gait and histologic changes, while the ASEPTIC group was not different from SHAM for either of these outcomes. When compared to the SHAM group, the EO group had similar gait outcomes, but greater histologic damage, and the EBEAM group had significantly worse gait and histological outcomes. The ECM-B composite produced using aseptically processed ECM powder mitigated the gait and histologic changes associated with osteoarthritis after ACL transection in the rat; however, care must be taken when selecting a terminal sterilization method as this may affect the effectiveness of treatment.
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Affiliation(s)
- Naga Padmini Karamchedu
- Department of Orthopaedics, Warren Alpert Medical School of
Brown University/Rhode Island Hospital, Providence, RI, USA
| | - Braden C. Fleming
- Department of Orthopaedics, Warren Alpert Medical School of
Brown University/Rhode Island Hospital, Providence, RI, USA
| | - Benedikt L. Proffen
- Department of Orthopaedic Surgery, Boston Children’s
Hospital, Harvard Medical School, Boston, MA, USA
| | - Nicholas J. Sant
- Department of Orthopaedic Surgery, Boston Children’s
Hospital, Harvard Medical School, Boston, MA, USA
| | - Gabriela Portilla
- Department of Orthopaedic Surgery, Boston Children’s
Hospital, Harvard Medical School, Boston, MA, USA
| | - Lauren R. Parola
- Department of Orthopaedics, Warren Alpert Medical School of
Brown University/Rhode Island Hospital, Providence, RI, USA
| | - Janine Molino
- Department of Orthopaedics, Warren Alpert Medical School of
Brown University/Rhode Island Hospital, Providence, RI, USA
| | - Martha M. Murray
- Department of Orthopaedic Surgery, Boston Children’s
Hospital, Harvard Medical School, Boston, MA, USA
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5
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Dimensional accuracy of 3D printing navigation templates of chemical-based sterilisation. Sci Rep 2022; 12:1253. [PMID: 35075238 PMCID: PMC8786919 DOI: 10.1038/s41598-022-05412-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2021] [Accepted: 01/11/2022] [Indexed: 11/24/2022] Open
Abstract
3D printed navigational templates have facilitated the accurate treatment of orthopaedic patients. However, during practical operation, it is found that the location hole occasionally deviates from the ideal channel. As such, there will be a security risk in clinical applications. The purpose of this study was to evaluate the influence of chemical-based sterilisation methods on the dimensional accuracy of different materials and the influence of module parameters on the degree of deformation. We found that polylactic (PLA) modules sterilised with ethylene oxide (EO) would undergo micro-deformation, and these micro-deformation characteristics depend on the building direction, i.e., the module stretches in the Z direction and shrinks in the X and Y directions. Heat-resisting polylactide (HR-PLA) has the same melting temperature (Tm) as PLA, but its glass transition temperature (Tg) is greater than the EO sterilisation temperature, so there is no obvious deformation after EO sterilisation. The layer height of the module were inversely proportional to the degree of deformation in the same sterilisation method. The deformation time of the module is concentrated within 2 h after heating. The micro-deformation of the 3D printing module depends on its Tg, sterilisation temperature, and duration of the sterilisation cycle.
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6
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Tipnis N, Kastellorizios M, Legassey A, Papadimitrakopoulos F, Jain F, Burgess DJ. Sterilization of Drug-Loaded Composite Coatings for Implantable Glucose Biosensors. J Diabetes Sci Technol 2021; 15:646-654. [PMID: 31786953 PMCID: PMC8120053 DOI: 10.1177/1932296819890620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND An anti-inflammatory drug-loaded composite coating (dexamethasone-loaded poly (lactic-co-glycolic acid) [PLGA] microspheres/polyvinyl alcohol [PVA] hydrogel) was previously developed to counter the foreign body reaction to a fully implantable continuous glucose monitoring biosensor. The long-term sensor functionality was ensured in the presence of the drug-loaded composite coating thus facilitating better diabetes control and management. In order to advance such a drug-device combination product toward clinical testing, addressing sterilization remains a key step due to the heterogeneity of the product components. The main objective of this research was to investigate the effect of two terminal sterilization techniques: gamma radiation and ethylene oxide (EO) on the stability of the anti-inflammatory coatings as well as retention of the glucose sensing ability of the implantable sensor. METHOD The composite coatings, their individual components, and the glucose-sensing elements of the biosensor were subjected to low-temperature gamma radiation and EO cycles. Detailed characterization was conducted on all components before and after sterilization. RESULTS Exposure to gamma radiation affected dexamethasone crystallinity and glucose response linearity of the sensing element, whereas physical aging of microspheres in composite coatings was observed poststerilization with EO. Despite these effects, dexamethasone drug release from coatings was not significantly affected by either technique. CONCLUSION The research findings indicate that both sterilization techniques are feasible for the sterilization of the dexamethasone-loaded PLGA microspheres/PVA hydrogel composite coatings, while EO was preferred for the sterilization of the glucose-sensing element of the biosensor.
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Affiliation(s)
- Namita Tipnis
- Department of Pharmaceutical Sciences,
University of Connecticut, Storrs, CT, USA
| | - Michail Kastellorizios
- Biorasis, Inc., UConn Technology
Incubation Program, Storrs, CT, USA
- Current address: Department of
Pharmaceutical Sciences, University of North Texas Health Science Center, Fort
Worth, TX, USA
| | - Allen Legassey
- Biorasis, Inc., UConn Technology
Incubation Program, Storrs, CT, USA
| | - Fotios Papadimitrakopoulos
- Biorasis, Inc., UConn Technology
Incubation Program, Storrs, CT, USA
- Institute of Materials Science,
University of Connecticut, Storrs, CT, USA
| | - Faquir Jain
- Biorasis, Inc., UConn Technology
Incubation Program, Storrs, CT, USA
- Department of Electrical and Computer
Engineering, University of Connecticut, Storrs, CT, USA
| | - Diane J. Burgess
- Department of Pharmaceutical Sciences,
University of Connecticut, Storrs, CT, USA
- Diane J. Burgess, PhD, Department of
Pharmaceutical Sciences, University of Connecticut, 69 N. Eagleville Rd, Storrs,
CT 06269, USA.
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7
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Kirillova A, Yeazel TR, Asheghali D, Petersen SR, Dort S, Gall K, Becker ML. Fabrication of Biomedical Scaffolds Using Biodegradable Polymers. Chem Rev 2021; 121:11238-11304. [PMID: 33856196 DOI: 10.1021/acs.chemrev.0c01200] [Citation(s) in RCA: 94] [Impact Index Per Article: 31.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Degradable polymers are used widely in tissue engineering and regenerative medicine. Maturing capabilities in additive manufacturing coupled with advances in orthogonal chemical functionalization methodologies have enabled a rapid evolution of defect-specific form factors and strategies for designing and creating bioactive scaffolds. However, these defect-specific scaffolds, especially when utilizing degradable polymers as the base material, present processing challenges that are distinct and unique from other classes of materials. The goal of this review is to provide a guide for the fabrication of biodegradable polymer-based scaffolds that includes the complete pathway starting from selecting materials, choosing the correct fabrication method, and considering the requirements for tissue specific applications of the scaffold.
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Affiliation(s)
- Alina Kirillova
- Thomas Lord Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708, United States
| | - Taylor R Yeazel
- Thomas Lord Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708, United States
| | - Darya Asheghali
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Shannon R Petersen
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Sophia Dort
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Ken Gall
- Thomas Lord Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708, United States
| | - Matthew L Becker
- Thomas Lord Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708, United States.,Department of Chemistry, Duke University, Durham, North Carolina 27708, United States.,Departments of Biomedical Engineering and Orthopaedic Surgery, Duke University, Durham, North Carolina 27708, United States
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8
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Dohi S, Matsumoto A. Synthesis of hydrogels with a gradient crosslinking structure by electron beam radiation to an aqueous solution of poly(sodium acrylate). J Appl Polym Sci 2020. [DOI: 10.1002/app.49515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Shunsuke Dohi
- Department of Applied Chemistry, Graduate School of EngineeringOsaka Prefecture University Osaka Japan
| | - Akikazu Matsumoto
- Department of Applied Chemistry, Graduate School of EngineeringOsaka Prefecture University Osaka Japan
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9
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Burrell JC, Bhatnagar D, Brown DP, Murthy NS, Dutton J, Browne KD, Laimo FA, Ali ZS, Rosen JM, Kaplan HM, Kohn J, Cullen DK. Tyrosine-derived polycarbonate nerve guidance tubes elicit proregenerative extracellular matrix deposition when used to bridge segmental nerve defects in swine. J Biomed Mater Res A 2020; 109:1183-1195. [PMID: 32985789 DOI: 10.1002/jbm.a.37110] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 09/23/2020] [Accepted: 09/26/2020] [Indexed: 12/15/2022]
Abstract
Promising biomaterials should be tested in appropriate large animal models that recapitulate human inflammatory and regenerative responses. Previous studies have shown tyrosine-derived polycarbonates (TyrPC) are versatile biomaterials with a wide range of applications across multiple disciplines. The library of TyrPC has been well studied and consists of thousands of polymer compositions with tunable mechanical characteristics and degradation and resorption rates that are useful for nerve guidance tubes (NGTs). NGTs made of different TyrPCs have been used in segmental nerve defect models in small animals. The current study is an extension of this work and evaluates NGTs made using two different TyrPC compositions in a 1 cm porcine peripheral nerve repair model. We first evaluated a nondegradable TyrPC formulation, demonstrating proof-of-concept chronic regenerative efficacy up to 6 months with similar nerve/muscle electrophysiology and morphometry to the autograft repair control. Next, we characterized the acute regenerative response using a degradable TyrPC formulation. After 2 weeks in vivo, TyrPC NGT promoted greater deposition of pro-regenerative extracellular matrix (ECM) constituents (in particular collagen I, collagen III, collagen IV, laminin, and fibronectin) compared to commercially available collagen-based NGTs. This corresponded with dense Schwann cell infiltration and axon extension across the lumen. These findings confirmed results reported previously in a mouse model and reveal that TyrPC NGTs were well tolerated in swine and facilitated host axon regeneration and Schwann cell infiltration in the acute phase across segmental defects - likely by eliciting a favorable neurotrophic ECM milieu. This regenerative response ultimately can contribute to functional recovery.
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Affiliation(s)
- Justin C Burrell
- Center for Brain Injury & Repair, Department of Neurosurgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.,Center for Neurotrauma, Neurodegeneration & Restoration, Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, Pennsylvania, USA.,Department of Bioengineering, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Divya Bhatnagar
- New Jersey Center for Biomaterials, Rutgers University, New Brunswick, New Jersey, USA
| | - Dan P Brown
- Center for Brain Injury & Repair, Department of Neurosurgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.,Center for Neurotrauma, Neurodegeneration & Restoration, Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, Pennsylvania, USA
| | - N Sanjeeva Murthy
- New Jersey Center for Biomaterials, Rutgers University, New Brunswick, New Jersey, USA
| | - John Dutton
- Center for Brain Injury & Repair, Department of Neurosurgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Kevin D Browne
- Center for Brain Injury & Repair, Department of Neurosurgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.,Center for Neurotrauma, Neurodegeneration & Restoration, Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, Pennsylvania, USA
| | - Franco A Laimo
- Center for Brain Injury & Repair, Department of Neurosurgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.,Center for Neurotrauma, Neurodegeneration & Restoration, Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, Pennsylvania, USA
| | - Zarina S Ali
- Center for Brain Injury & Repair, Department of Neurosurgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Joseph M Rosen
- Dartmouth-Hitchcock Medical Center, Division of Plastic Surgery, Dartmouth College, Lebanon, New Hampshire, USA
| | - Hilton M Kaplan
- New Jersey Center for Biomaterials, Rutgers University, New Brunswick, New Jersey, USA
| | - Joachim Kohn
- New Jersey Center for Biomaterials, Rutgers University, New Brunswick, New Jersey, USA
| | - D Kacy Cullen
- Center for Brain Injury & Repair, Department of Neurosurgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.,Center for Neurotrauma, Neurodegeneration & Restoration, Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, Pennsylvania, USA.,Department of Bioengineering, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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10
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Kushwah V, Poms J, Vuylsteke B, Peter A, Paudel A. Towards an Understanding of the Adsorption of Vaporized Hydrogen Peroxide (VHP) Residues on Glass Vials After a VHP Decontamination Process Using a Miniaturized Tool. J Pharm Sci 2020; 109:2454-2463. [DOI: 10.1016/j.xphs.2020.04.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 04/10/2020] [Accepted: 04/13/2020] [Indexed: 01/21/2023]
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11
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Gama AR, Ng ZY, Shanmugarajah K, Mastroianni M, Randolph MA, Lellouch AG, Kohn J, Cetrulo CL. Local Immunosuppression for Vascularized Composite Allografts: Application of Topical FK506-TyroSpheres in a Nonhuman Primate Model. J Burn Care Res 2020; 41:1172-1178. [DOI: 10.1093/jbcr/iraa062] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Abstract
Transplantation of vascularized composite allografts (VCAs) provides a means of restoring complex anatomical and functional units following burns and other disfigurement otherwise not amenable to conventional autologous reconstructive surgery. While short- to intermediate-term VCA survival is largely dependent on patient compliance with medication, the myriad of side effects resulting from lifelong systemic immunosuppression continue to pose a significant challenge. Topical immunosuppression is therefore a logical and attractive alternative for VCA. Current formulations are limited though, by poor skin penetration but this may be mitigated by conjugation of immunosuppressive drugs to TyroSpheres for enhanced delivery. Therefore, we investigated the topical application of FK506-TyroSpheres (in the form of a gel dressing) in a clinically relevant nonhuman primate VCA model to determine if allograft survival could be prolonged at reduced levels of maintenance systemic immunosuppression. Six Major Histocompatibility Complex (MHC)-mismatched cynomolgus macaques (Macaca fascicularis) served as reciprocal donors and recipients of radial forearm fasciocutaneous flaps. Standard Bacitracin ointment and FK506-TyroSpheres were applied every other day to the VCAs of animals in groups 1 (controls, n = 2) and 2 (experimental, n = 4), respectively, before gradual taper of systemic FK506. Clinical features of VCA rejection still developed when systemic FK506 fell below 10 ng/ml despite application of FK506-TyroSpheres and prolonged VCA survival was not achieved. However, unwanted systemic FK506 absorption was avoided with TyroSphere technology. Further refinement to optimize local drug delivery profiles to achieve and maintain therapeutic delivery of FK506 with TyroSpheres is underway, leveraging significant experience in controlled drug delivery to mitigate acute rejection of VCAs.
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Affiliation(s)
- Amon-Ra Gama
- Department of Surgery, Vascularized Composite Allotransplantation Laboratory, Center for Transplantation Sciences, Massachusetts General Hospital, Harvard Medical School, Boston
- Division of Plastic and Reconstructive Surgery University, Rutgers New Jersey Medical School, Newark
| | - Zhi Yang Ng
- Department of Surgery, Vascularized Composite Allotransplantation Laboratory, Center for Transplantation Sciences, Massachusetts General Hospital, Harvard Medical School, Boston
- Division of Plastic and Reconstructive Surgery, Massachusetts General Hospital, Harvard Medical School, Boston
| | - Kumaran Shanmugarajah
- Department of Surgery, Vascularized Composite Allotransplantation Laboratory, Center for Transplantation Sciences, Massachusetts General Hospital, Harvard Medical School, Boston
- Division of Plastic and Reconstructive Surgery, Massachusetts General Hospital, Harvard Medical School, Boston
| | - Melissa Mastroianni
- Department of Surgery, Vascularized Composite Allotransplantation Laboratory, Center for Transplantation Sciences, Massachusetts General Hospital, Harvard Medical School, Boston
- Division of Plastic and Reconstructive Surgery, Massachusetts General Hospital, Harvard Medical School, Boston
| | - Mark A Randolph
- Department of Surgery, Vascularized Composite Allotransplantation Laboratory, Center for Transplantation Sciences, Massachusetts General Hospital, Harvard Medical School, Boston
- Division of Plastic and Reconstructive Surgery, Massachusetts General Hospital, Harvard Medical School, Boston
| | - Alexandre G Lellouch
- Department of Surgery, Vascularized Composite Allotransplantation Laboratory, Center for Transplantation Sciences, Massachusetts General Hospital, Harvard Medical School, Boston
- Division of Plastic and Reconstructive Surgery, Massachusetts General Hospital, Harvard Medical School, Boston
- Department of Plastic, Reconstructive and Aesthetic Surgery. Service de Chirurgie Plastique, Hôpital Européen Georges Pompidou, Assistance Publique-Hôpitaux de Paris (APHP), Université Paris Descartes, Paris, France
| | - Joachim Kohn
- Department of Life Sciences, The New Jersey Center for Biomaterials, Rutgers—The State University of New Jersey, Piscataway
| | - Curtis L Cetrulo
- Department of Surgery, Vascularized Composite Allotransplantation Laboratory, Center for Transplantation Sciences, Massachusetts General Hospital, Harvard Medical School, Boston
- Division of Plastic and Reconstructive Surgery, Massachusetts General Hospital, Harvard Medical School, Boston
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12
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Liu X, Li X, Liu X, He S, Jin J, Meng H. Green preparation of Ag-ZnO-rGO nanoparticles for efficient adsorption and photodegradation activity. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2019.124011] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Chen Y, Neff M, McEvoy B, Cao Z, Pezzoli R, Murphy A, Gately N, Jnr MH, Rowan NJ, Devine DM. 3D printed polymers are less stable than injection moulded counterparts when exposed to terminal sterilization processes using novel vaporized hydrogen peroxide and electron beam processes. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.121870] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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14
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Kiyotake EA, Douglas AW, Thomas EE, Nimmo SL, Detamore MS. Development and quantitative characterization of the precursor rheology of hyaluronic acid hydrogels for bioprinting. Acta Biomater 2019; 95:176-187. [PMID: 30669003 DOI: 10.1016/j.actbio.2019.01.041] [Citation(s) in RCA: 79] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 12/18/2018] [Accepted: 01/17/2019] [Indexed: 12/20/2022]
Abstract
Bioprinting technologies have tremendous potential for advancing regenerative medicine due to the precise spatial control over depositing a printable biomaterial, or bioink. Despite the growing interest in bioprinting, the field is challenged with developing biomaterials for extrusion-based bioprinting. The paradigm of contemporary bioink studies relies on trial-and-error methods for discovering printable biomaterials, which has little practical use for others who endeavor to develop bioinks. There is pressing need to follow the precedent set by a few pioneering studies that have attempted to standardize bioink characterizations for determining the properties that define printability. Here, we developed a pentenoate-functionalized hyaluronic acid hydrogel (PHA) into a printable bioink and used three recommended, quantitative rheological assessments to characterize the printability: 1) yield stress, 2) viscosity, and 3) storage modulus recovery. The most important characteristic is the yield stress; we found a yield stress upper limit of ∼1000 Pa for PHA. Measuring the viscosity was advantageous for determining shear-thinning behavior, which aided in extruding highly viscous PHA through a nozzle. Post-printing recovery is required to maintain shape fidelity and we found storage modulus recoveries above ∼85% were sufficient for PHA. Two formulations had superior printability (i.e., 1.5 MDa PHA - 4 wt%, and 1 MDa PHA - 8 wt%), and increasing cell concentrations in PHA up to 9 × 106 cells/mL had minimal effects on the printability. Even so, other factors such as sterilization and peptide modifications to enhance bioactivity may influence printability, highlighting the need for investigators to consider such factors when developing new bioinks. STATEMENT OF SIGNIFICANCE: Bioprinting has potential for regenerating damaged tissues; however, there are a limited number of printable biomaterials, and developing new bioinks is challenging because the required material physical properties for extrusion-based printing are not yet known. Most new bioinks are developed by trial-and-error, which is neither efficient nor comparable across materials. There is a need for the field to begin utilizing standard methods proposed by a few pioneering studies to characterize new bioinks. Therefore, we have developed the printability of a hyaluronic acid based-hydrogel and characterized the material with three quantitative rheological tests. The current work impacts the bioprinting field by demonstrating and encouraging the use of universal bioink characterizations and by providing printability windows to advance new bioink development.
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Affiliation(s)
- Emi A Kiyotake
- Stephenson School of Biomedical Engineering, University of Oklahoma, Norman, OK 73019, USA.
| | - Alexander W Douglas
- Stephenson School of Biomedical Engineering, University of Oklahoma, Norman, OK 73019, USA.
| | - Emily E Thomas
- Stephenson School of Biomedical Engineering, University of Oklahoma, Norman, OK 73019, USA.
| | - Susan L Nimmo
- Chemistry and biochemistry University of Oklahoma, Norman, OK 73019, USA.
| | - Michael S Detamore
- Stephenson School of Biomedical Engineering, University of Oklahoma, Norman, OK 73019, USA.
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15
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Zhao Y, Zhu B, Wang Y, Liu C, Shen C. Effect of different sterilization methods on the properties of commercial biodegradable polyesters for single-use, disposable medical devices. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 105:110041. [PMID: 31546462 DOI: 10.1016/j.msec.2019.110041] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 07/11/2019] [Accepted: 07/30/2019] [Indexed: 11/18/2022]
Abstract
The increasing employment of non-degradable polymers based single-use, disposable medical devices have led to huge environmental pressure. Replacement of non-degradable polymers with biodegradable alternatives could be one solution. Since terminal sterilization is a necessary procedure for medical devices to eliminate infections, in this paper, the modifications of sterilization on the transparency, yellow index, dimensional stability and mechanical properties of commercial biodegradable poly(lactic acid) (PLA), poly(butylenes adipate-co-terephthalate) (PBAT) and their blends were investigated. The samples were prepared by compression molding and exposed to four sterilization treatments including ethylene oxide gas (EtO), saturated steam (SS), electron beam (EB), and hydrogen peroxide gas plasma (HPGP). It is concluded that EB can be applied for the sterilization of all the materials investigated, while SS and EtO are not recommended for PLA, and HPGP is not for PBAT and PLA/PBAT blends. This study demonstrates that, when a suitable sterilization process is chosen, PLA has potential to be used for transparent medical devices such as the barrel of syringes or microfluidic chips, while PBAT and PLA/PBAT blends for other non-transparent medical packaging applications.
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Affiliation(s)
- Yuping Zhao
- Key Laboratory of Materials Processing & Mold (Zhengzhou University), Ministry of Education, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002, China; Center for Applied Polymer Research, Henan Tuoren Medical Device Co., Ltd., Weiyuan Industrial Park, Changyuan 453400, China
| | - Bo Zhu
- Key Laboratory of Materials Processing & Mold (Zhengzhou University), Ministry of Education, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002, China
| | - Yaming Wang
- Key Laboratory of Materials Processing & Mold (Zhengzhou University), Ministry of Education, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002, China.
| | - Chuntai Liu
- Key Laboratory of Materials Processing & Mold (Zhengzhou University), Ministry of Education, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002, China.
| | - Changyu Shen
- Key Laboratory of Materials Processing & Mold (Zhengzhou University), Ministry of Education, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002, China
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16
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Zhang Y, Moeller R, Tran S, Dubovcova B, Akepsimaidis G, Meneses N, Drissner D, Mathys A. Geobacillus and Bacillus Spore Inactivation by Low Energy Electron Beam Technology: Resistance and Influencing Factors. Front Microbiol 2018; 9:2720. [PMID: 30532740 PMCID: PMC6265500 DOI: 10.3389/fmicb.2018.02720] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Accepted: 10/24/2018] [Indexed: 11/13/2022] Open
Abstract
Low energy electron beam (LEEB) treatment is an emerging non-thermal technology that performs surface decontamination with a minimal influence on food quality. Bacterial spore resistance toward LEEB treatment and its influencing factors were investigated in this study. Spores from Geobacillus and Bacillus species were treated with a lab-scale LEEB at energy levels of 80 and 200 keV. The spore resistances were expressed as D-values (the radiation dose required for one log10 reduction at a given energy level) calculated from the linear regression of log10 reduction against absorbed dose of the sample. The results revealed that the spore inactivation efficiency by LEEB is comparable to that of other ionizing radiations and that the inactivation curves are mostly log10-linear at the investigated dose range (3.8 - 8.2 kGy at 80 keV; 6.0 - 9.8 kGy at 200 keV). The D-values obtained from the wildtype strains varied from 2.2 - 3.0 kGy at 80 keV, and from 2.2 - 3.1 kGy at 200 keV. Bacillus subtilis mutant spores lacking α/β-type small, acid-soluble spore proteins showed decreased D-values (1.3 kGy at 80 and 200 keV), indicating that spore DNA is one of the targets for LEEB spore inactivation. The results revealed that bacterial species, sporulation conditions and the treatment dose influence the spore LEEB inactivation. This finding indicates that for the application of this emerging technology, special attention should be paid to the choice of biological indicator, physiological state of the indicator and the processing settings. High spore inactivation efficiency supports the application of LEEB for the purpose of food surface decontamination. With its environmental, logistical, and economic advantages, LEEB can be a relevant technology for surface decontamination to deliver safe, minimally processed and additive-free food products.
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Affiliation(s)
- Yifan Zhang
- Sustainable Food Processing Laboratory, Institute of Food, Nutrition and Health, Department of Health Science and Technology, ETH Zurich, Zurich, Switzerland
| | - Ralf Moeller
- Space Microbiology Research Group, Institute of Aerospace Medicine, Radiation Biology Division, German Aerospace Center, Cologne, Germany
| | - Sophia Tran
- Sustainable Food Processing Laboratory, Institute of Food, Nutrition and Health, Department of Health Science and Technology, ETH Zurich, Zurich, Switzerland
| | - Barbora Dubovcova
- Digital Technologies, Data Analytics and Services Business Unit, Bühler AG, Uzwil, Switzerland
| | - Georgios Akepsimaidis
- Digital Technologies, Data Analytics and Services Business Unit, Bühler AG, Uzwil, Switzerland
| | - Nicolas Meneses
- Digital Technologies, Data Analytics and Services Business Unit, Bühler AG, Uzwil, Switzerland
| | - David Drissner
- Microbiology of Plant Foods, Agroscope, Waedenswil, Switzerland
- Department of Life Sciences, Albstadt-Sigmaringen University, Sigmaringen, Germany
| | - Alexander Mathys
- Sustainable Food Processing Laboratory, Institute of Food, Nutrition and Health, Department of Health Science and Technology, ETH Zurich, Zurich, Switzerland
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17
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Kim HY, Kim SK, Seo HS, Jeong S, Ahn KB, Yun CH, Han SH. Th17 activation by dendritic cells stimulated with gamma-irradiated Streptococcus pneumoniae. Mol Immunol 2018; 101:344-352. [PMID: 30036800 DOI: 10.1016/j.molimm.2018.07.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 06/22/2018] [Accepted: 07/15/2018] [Indexed: 12/11/2022]
Abstract
Dendritic cells (DCs) play an important role in antigen presentation, which is an essential step for the induction of antigen-specific adaptive immunity. Inactivated bacterial whole cell vaccines have been widely used to prevent many bacterial infections because they elicit good immunogenicity due to the presence of various antigens and are relatively inexpensive and easy to manufacture. Recently, gamma-irradiated whole cells of nonencapsulated Streptococcus pneumoniae were developed as a broad-spectrum and serotype-independent multivalent vaccine. In the present study, we generated gamma-irradiated S. pneumoniae (r-SP) and investigated its capacity to stimulate mouse bone marrow-derived DCs (BM-DCs) in comparison with heat-inactivated and formalin-inactivated S. pneumoniae (h-SP and f-SP, respectively). r-SP showed an attenuated binding and internalization level to BM-DCs when compared to h-SP or f-SP. r-SP weakly induced the expression of CD80, CD83, CD86, MHC class I, and PD-L2 compared with h-SP or f-SP. Furthermore, r-SP less potently induced IL-6, TNF-α, and IL-23 expression than h-SP or f-SP but more potently induced IL-1β expression than h-SP or f-SP in BM-DCs. Since Th17-mediated immune responses are known to be important for the protection against pneumococcal infections, r-SP-primed DCs were co-cultured with splenocytes or splenic CD4+ T cells. Interestingly, r-SP-sensitized BM-DCs markedly induced IL-17A+ CD4+ T cells whereas h-SP- or f-SP-sensitized BM-DCs weakly induced them. Collectively, these results suggest that r-SP could be an effective pneumococcal vaccine candidate eliciting Th17-mediated immune responses by stimulation of DCs.
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Affiliation(s)
- Hyun Young Kim
- Department of Oral Microbiology and Immunology, DRI, and BK21 Plus Program, School of Dentistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Sun Kyung Kim
- Department of Oral Microbiology and Immunology, DRI, and BK21 Plus Program, School of Dentistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Ho Seong Seo
- Research Division for Biotechnology, Korea Atomic Energy Research Institute, Jeongeup 56212, Republic of Korea
| | - Soyoung Jeong
- Department of Oral Microbiology and Immunology, DRI, and BK21 Plus Program, School of Dentistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Ki Bum Ahn
- Department of Oral Microbiology and Immunology, DRI, and BK21 Plus Program, School of Dentistry, Seoul National University, Seoul 08826, Republic of Korea; Research Division for Biotechnology, Korea Atomic Energy Research Institute, Jeongeup 56212, Republic of Korea
| | - Cheol-Heui Yun
- Department of Agricultural Biotechnology and Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Seung Hyun Han
- Department of Oral Microbiology and Immunology, DRI, and BK21 Plus Program, School of Dentistry, Seoul National University, Seoul 08826, Republic of Korea.
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18
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Roman S, Hillary C, Narice B, Bullock AJ, Anumba DO, MacNeil S. Visualisation of the insertion of a membrane for the treatment of preterm rupture of fetal membranes using a synthetic model of a pregnant uterus. J Biomater Appl 2018; 33:234-244. [PMID: 29996717 DOI: 10.1177/0885328218786038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Preterm premature rupture of fetal membranes is a leading cause of preterm delivery. Preterm labour can compromise fetal survival, and even if a pregnancy affected by preterm premature rupture of fetal membrane continues, major complications associated with leakage of amniotic fluid and risk of infection can affect the normal development and survival of the baby. There are limited management options for preterm premature rupture of fetal membrane other than delivery of the baby if ascending infection (chorioamnionitis) is suspected. We have previously reported the development and characterisation of an implantable membrane with the aim of using it to occlude the internal os of the cervix, in order to prevent amniotic fluid loss, allow fluid reaccumulation and reduce the risk of chorioamnionitis. For this, an electrospun biocompatible and distensible bilayer membrane was designed with mechanical properties similar to the human amniotic membrane. In this study, we consider the effects of sterilization on the membrane, how to insert the membrane and visualise it using routine clinical methods. To do this, we used e-beam sterilisation and examined the ability of the membrane to adhere to ex vivo human cervical tissues. We also studied its insertion into a custom-synthesised model of a 20-week pregnant uterus and imaged the membrane using ultrasound. Sterilisation produced minor effects on physical and mechanical properties, but these did not affect the capacity of the membrane to be sutured or to provide a fluid barrier. We demonstrated that fibrin glue can successfully adhere the bilayer membrane to cervical tissues. Finally, we demonstrated that the membrane can be inserted through the cervix as well as visualized in place using ultrasound imaging and an endoscope. In summary, we suggest this membrane is a candidate for further development in an appropriate animal model, supported by appropriate imaging, to precede possible future human studies if judged to demonstrate satisfactory safety and efficacy profiles.
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Affiliation(s)
- Sabiniano Roman
- Kroto Research Institute, University of Sheffield, Sheffield, UK
| | | | - Brenda Narice
- Kroto Research Institute, University of Sheffield, Sheffield, UK
| | | | - Dilly Oc Anumba
- Kroto Research Institute, University of Sheffield, Sheffield, UK
| | - Sheila MacNeil
- Kroto Research Institute, University of Sheffield, Sheffield, UK
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19
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Guerra AJ, Cano P, Rabionet M, Puig T, Ciurana J. Effects of different sterilization processes on the properties of a novel 3D-printed polycaprolactone stent. POLYM ADVAN TECHNOL 2018. [DOI: 10.1002/pat.4344] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Antonio J. Guerra
- Universitat de Girona; Mechanical Engineering and Civil Construction; Girona Spain
| | - Paula Cano
- Universitat de Girona; Medical Sciences; Girona Spain
| | - Marc Rabionet
- Universitat de Girona; Mechanical Engineering and Civil Construction; Girona Spain
- Universitat de Girona; Medical Sciences; Girona Spain
| | - Teresa Puig
- Universitat de Girona; Medical Sciences; Girona Spain
| | - Joaquim Ciurana
- Universitat de Girona; Mechanical Engineering and Civil Construction; Girona Spain
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20
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Garle AL, White F, Budhlall BM. Improving the antifouling properties of polypropylene surfaces by melt blending with polyethylene glycol diblock copolymers. J Appl Polym Sci 2017. [DOI: 10.1002/app.46122] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Amit L. Garle
- Department of Plastics Engineering and Center for High‐Rate NanomanufacturingUniversity of MassachusettsLowell Massachusetts 01854
- Mayo ClinicRochester Minnesota
| | - Fernanda White
- Department of Plastics Engineering and Center for High‐Rate NanomanufacturingUniversity of MassachusettsLowell Massachusetts 01854
| | - Bridgette M. Budhlall
- Department of Plastics Engineering and Center for High‐Rate NanomanufacturingUniversity of MassachusettsLowell Massachusetts 01854
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21
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Bhatnagar D, Bushman JS, Murthy NS, Merolli A, Kaplan HM, Kohn J. Fibrin glue as a stabilization strategy in peripheral nerve repair when using porous nerve guidance conduits. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2017; 28:79. [PMID: 28389905 PMCID: PMC5384961 DOI: 10.1007/s10856-017-5889-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Accepted: 03/25/2017] [Indexed: 06/07/2023]
Abstract
Porous conduits provide a protected pathway for nerve regeneration, while still allowing exchange of nutrients and wastes. However, pore sizes >30 µm may permit fibrous tissue infiltration into the conduit, which may impede axonal regeneration. Coating the conduit with Fibrin Glue (FG) is one option for controlling the conduit's porosity. FG is extensively used in clinical peripheral nerve repair, as a tissue sealant, filler and drug-delivery matrix. Here, we compared the performance of FG to an alternative, hyaluronic acid (HA) as a coating for porous conduits, using uncoated porous conduits and reverse autografts as control groups. The uncoated conduit walls had pores with a diameter of 60 to 70 µm that were uniformly covered by either FG or HA coatings. In vitro, FG coatings degraded twice as fast as HA coatings. In vivo studies in a 1 cm rat sciatic nerve model showed FG coating resulted in poor axonal density (993 ± 854 #/mm2), negligible fascicular area (0.03 ± 0.04 mm2), minimal percent wet muscle mass recovery (16 ± 1 in gastrocnemius and 15 ± 5 in tibialis anterior) and G-ratio (0.73 ± 0.01). Histology of FG-coated conduits showed excessive fibrous tissue infiltration inside the lumen, and fibrin capsule formation around the conduit. Although FG has been shown to promote nerve regeneration in non-porous conduits, we found that as a coating for porous conduits in vivo, FG encourages scar tissue infiltration that impedes nerve regeneration. This is a significant finding considering the widespread use of FG in peripheral nerve repair.
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Affiliation(s)
- Divya Bhatnagar
- New Jersey Center for Biomaterials, Rutgers-The State University of New Jersey, 145 Bevier Road, Piscataway, NJ, 08854, USA
| | - Jared S Bushman
- New Jersey Center for Biomaterials, Rutgers-The State University of New Jersey, 145 Bevier Road, Piscataway, NJ, 08854, USA
- School of Pharmacy, University of Wyoming, 1000 E University Ave Dept. 3375, Laramie, WY, 82071, USA
| | - N Sanjeeva Murthy
- New Jersey Center for Biomaterials, Rutgers-The State University of New Jersey, 145 Bevier Road, Piscataway, NJ, 08854, USA
| | - Antonio Merolli
- New Jersey Center for Biomaterials, Rutgers-The State University of New Jersey, 145 Bevier Road, Piscataway, NJ, 08854, USA
| | - Hilton M Kaplan
- New Jersey Center for Biomaterials, Rutgers-The State University of New Jersey, 145 Bevier Road, Piscataway, NJ, 08854, USA
| | - Joachim Kohn
- New Jersey Center for Biomaterials, Rutgers-The State University of New Jersey, 145 Bevier Road, Piscataway, NJ, 08854, USA.
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