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Al-Khoury H, Espinosa-Cano E, Aguilar MR, Román JS, Syrowatka F, Schmidt G, Groth T. Anti-inflammatory Surface Coatings Based on Polyelectrolyte Multilayers of Heparin and Polycationic Nanoparticles of Naproxen-Bearing Polymeric Drugs. Biomacromolecules 2019; 20:4015-4025. [DOI: 10.1021/acs.biomac.9b01098] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hala Al-Khoury
- Department Biomedical Materials, Institute of Pharmacy, Martin Luther University Halle Wittenberg, Heinrich Damerow Strasse 4, 06120 Halle (Saale), Germany
- Interdisciplinary Centre of Materials Science, Martin Luther University Halle-Wittenberg, 06120 Halle (Saale), Germany
| | - Eva Espinosa-Cano
- Biomaterials Group, Department of Polymeric Nanomaterials and Biomaterials, Institute of Polymer Science and Technology, ICTP-CSIC, Juan de la Cierva 3, 28006 Madrid, Spain
- Networking Biomedical Research Centre in Bioengineering, Biomaterials and Nanomedicine, CIBER-BBN, 28029 Madrid, Spain
| | - María Rosa Aguilar
- Biomaterials Group, Department of Polymeric Nanomaterials and Biomaterials, Institute of Polymer Science and Technology, ICTP-CSIC, Juan de la Cierva 3, 28006 Madrid, Spain
- Networking Biomedical Research Centre in Bioengineering, Biomaterials and Nanomedicine, CIBER-BBN, 28029 Madrid, Spain
| | - Julio San Román
- Biomaterials Group, Department of Polymeric Nanomaterials and Biomaterials, Institute of Polymer Science and Technology, ICTP-CSIC, Juan de la Cierva 3, 28006 Madrid, Spain
- Networking Biomedical Research Centre in Bioengineering, Biomaterials and Nanomedicine, CIBER-BBN, 28029 Madrid, Spain
| | - Frank Syrowatka
- Interdisciplinary Centre of Materials Science, Martin Luther University Halle-Wittenberg, 06120 Halle (Saale), Germany
| | - Georg Schmidt
- Interdisciplinary Centre of Materials Science, Martin Luther University Halle-Wittenberg, 06120 Halle (Saale), Germany
| | - Thomas Groth
- Department Biomedical Materials, Institute of Pharmacy, Martin Luther University Halle Wittenberg, Heinrich Damerow Strasse 4, 06120 Halle (Saale), Germany
- Interdisciplinary Centre of Materials Science, Martin Luther University Halle-Wittenberg, 06120 Halle (Saale), Germany
- Interdisciplinary Centre of Applied Science, Martin Luther University Halle-Wittenberg, 06099 Halle (Saale), Germany
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2
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Zhou G, Groth T. Host Responses to Biomaterials and Anti-Inflammatory Design-a Brief Review. Macromol Biosci 2018; 18:e1800112. [DOI: 10.1002/mabi.201800112] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 05/08/2018] [Indexed: 12/13/2022]
Affiliation(s)
- Guoying Zhou
- Biomedical Materials Group; Institute of Pharmacy; Martin Luther University Halle-Wittenberg; 06099 Halle (Saale) Germany
| | - Thomas Groth
- Biomedical Materials Group; Institute of Pharmacy and, Interdisciplinary Center of Material Science and Interdisciplinary Center for Transfer-Oriented Research in Natural Sciences; Martin Luther University Halle-Wittenberg; 06099 Halle (Saale) Germany
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3
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Markov PA, Krachkovsky NS, Durnev EA, Martinson EA, Litvinets SG, Popov SV. Mechanical properties, structure, bioadhesion, and biocompatibility of pectin hydrogels. J Biomed Mater Res A 2017; 105:2572-2581. [PMID: 28544261 DOI: 10.1002/jbm.a.36116] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Revised: 05/13/2017] [Accepted: 05/15/2017] [Indexed: 12/21/2022]
Abstract
The surface structure, biocompatibility, textural, and adhesive properties of calcium hydrogels derived from 1, 2, and 4% solutions of apple pectin were examined in this study. An increase in the pectin concentration in hydrogels was shown to improve their stability toward elastic and plastic deformation. The elasticity of pectin hydrogels, measured as Young's modulus, ranged from 6 to 100 kPa. The mechanical properties of the pectin hydrogels were shown to correspond to those of soft tissues. The characterization of surface roughness in terms of the roughness profile (Ra) and the root-mean-square deviation of the roughness profile (Rq) indicated an increased roughness profile for hydrogels depending on their pectin concentration. The adhesion of AU2% and AU4% hydrogels to the serosa abdominal wall, liver, and colon was higher than that of the AU1% hydrogel. The adhesion of macrophages and the non-specific adsorption of blood plasma proteins were found to increase as the pectin concentration in the hydrogels increased. The rate of degradation of all hydrogels was higher in phosphate buffered saline (PBS) than that in DMEM and a fibroblast cell monolayer. The pectin hydrogel was also found to have a low cytotoxicity. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 105A: 2572-2581, 2017.
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Affiliation(s)
- Pavel A Markov
- Institute of Physiology, Komi Science Centre, The Urals Branch of the Russian Academy of Sciences, Syktyvkar, Russia
| | - Nikita S Krachkovsky
- Institute of Physiology, Komi Science Centre, The Urals Branch of the Russian Academy of Sciences, Syktyvkar, Russia
| | - Eugene A Durnev
- Department of Biotechnology, Vyatka State University, Kirov, Russia
| | | | | | - Sergey V Popov
- Institute of Physiology, Komi Science Centre, The Urals Branch of the Russian Academy of Sciences, Syktyvkar, Russia
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4
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Li H, Koenig AM, Sloan P, Leipzig ND. In vivo assessment of guided neural stem cell differentiation in growth factor immobilized chitosan-based hydrogel scaffolds. Biomaterials 2014; 35:9049-57. [DOI: 10.1016/j.biomaterials.2014.07.038] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Accepted: 07/21/2014] [Indexed: 01/01/2023]
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5
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Bryers JD, Giachelli CM, Ratner BD. Engineering biomaterials to integrate and heal: the biocompatibility paradigm shifts. Biotechnol Bioeng 2012; 109:1898-911. [PMID: 22592568 PMCID: PMC3490630 DOI: 10.1002/bit.24559] [Citation(s) in RCA: 172] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2012] [Revised: 04/27/2012] [Accepted: 05/10/2012] [Indexed: 12/19/2022]
Abstract
This article focuses on one of the major failure routes of implanted medical devices, the foreign body reaction (FBR)--that is, the phagocytic attack and encapsulation by the body of the so-called "biocompatible" biomaterials comprising the devices. We then review strategies currently under development that might lead to biomaterial constructs that will harmoniously heal and integrate into the body. We discuss in detail emerging strategies to inhibit the FBR by engineering biomaterials that elicit more biologically pertinent responses.
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Affiliation(s)
- James D Bryers
- Department of Bioengineering, University of Washington, Seattle, WA 98195-5061, USA.
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6
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Evaluation of the biocompatibility of a coating material for an implantable bladder volume sensor. Kaohsiung J Med Sci 2012; 28:123-9. [DOI: 10.1016/j.kjms.2011.10.016] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2011] [Accepted: 04/18/2011] [Indexed: 11/20/2022] Open
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7
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Delgado PA, Matloka P, Zuluaga F, Wagener KB. Synthesis and thermal crosslinking of carbosiloxane and oligo(oxyethylene) polymers. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.25048] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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8
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Ulery BD, Nair LS, Laurencin CT. Biomedical Applications of Biodegradable Polymers. JOURNAL OF POLYMER SCIENCE. PART B, POLYMER PHYSICS 2011; 49:832-864. [PMID: 21769165 PMCID: PMC3136871 DOI: 10.1002/polb.22259] [Citation(s) in RCA: 1185] [Impact Index Per Article: 91.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Utilization of polymers as biomaterials has greatly impacted the advancement of modern medicine. Specifically, polymeric biomaterials that are biodegradable provide the significant advantage of being able to be broken down and removed after they have served their function. Applications are wide ranging with degradable polymers being used clinically as surgical sutures and implants. In order to fit functional demand, materials with desired physical, chemical, biological, biomechanical and degradation properties must be selected. Fortunately, a wide range of natural and synthetic degradable polymers has been investigated for biomedical applications with novel materials constantly being developed to meet new challenges. This review summarizes the most recent advances in the field over the past 4 years, specifically highlighting new and interesting discoveries in tissue engineering and drug delivery applications.
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Affiliation(s)
- Bret D. Ulery
- Department of Orthopaedic Surgery, New England Musculoskeletal Institute, University of Connecticut Health Center, Farmington, Connecticut 06030
- Institute of Regenerative Engineering, University of Connecticut Health Center, Farmington, Connecticut 06030
| | - Lakshmi S. Nair
- Department of Orthopaedic Surgery, New England Musculoskeletal Institute, University of Connecticut Health Center, Farmington, Connecticut 06030
- Institute of Regenerative Engineering, University of Connecticut Health Center, Farmington, Connecticut 06030
- Department of Chemical, Materials & Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06268
| | - Cato T. Laurencin
- Department of Orthopaedic Surgery, New England Musculoskeletal Institute, University of Connecticut Health Center, Farmington, Connecticut 06030
- Institute of Regenerative Engineering, University of Connecticut Health Center, Farmington, Connecticut 06030
- Department of Chemical, Materials & Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06268
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9
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Bridges AW, Whitmire RE, Singh N, Templeman KL, Babensee JE, Lyon LA, García AJ. Chronic inflammatory responses to microgel-based implant coatings. J Biomed Mater Res A 2010; 94:252-8. [PMID: 20166218 DOI: 10.1002/jbm.a.32669] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Inflammatory responses to implanted biomedical devices elicit a foreign body fibrotic reaction that limits device integration and performance in various biomedical applications. We examined chronic inflammatory responses to microgel conformal coatings consisting of thin films of poly(N-isopropylacrylamide) hydrogel microparticles cross-linked with poly(ethylene glycol) diacrylate deposited on poly(ethylene terephthalate) (PET). Unmodified and microgel-coated PET disks were implanted subcutaneously in rats for 4 weeks and explants were analyzed by histology and immunohistochemistry. Microgel coatings reduced chronic inflammation and resulted in a more mature/organized fibrous capsule. Microgel-coated samples exhibited 22% thinner fibrous capsules that contained 40% fewer cells compared to unmodified PET disks. Furthermore, microgel-coated samples contained significantly higher levels of macrophages (80%) than unmodified PET controls. These results demonstrate that microgel coatings reduce chronic inflammation to implanted biomaterials. (c) 2010 Wiley Periodicals, Inc. J Biomed Mater Res, 2010.
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Affiliation(s)
- Amanda W Bridges
- Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332-0363, USA
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10
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Bosman W, Vlot J, van der Steenhoven T, van den Berg O, Hamming J, de Vries A, Brom H, Jacobs M. Aortic Customize: An In Vivo Feasibility Study of a Percutaneous Technique for the Repair of Aortic Aneurysms Using Injectable Elastomer. Eur J Vasc Endovasc Surg 2010; 40:65-70. [DOI: 10.1016/j.ejvs.2010.02.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2009] [Accepted: 02/25/2010] [Indexed: 11/26/2022]
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11
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Delgado PA, Zuluaga F, Matloka P, Wagener KB. Thermally crosslinked carbosiloxane and oligo(oxyethylene) polymers. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/pola.23550] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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12
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Hyperbranched polysiloxysilane nanoparticles: Surface charge control of nonviral gene delivery vectors and nanoprobes. Int J Pharm 2009; 376:141-52. [DOI: 10.1016/j.ijpharm.2009.04.023] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2008] [Revised: 04/01/2009] [Accepted: 04/20/2009] [Indexed: 11/22/2022]
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13
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Keranov I, Vladkova TG, Minchev M, Kostadinova A, Altankov G, Dineff P. Topography characterization and initial cellular interaction of plasma-based Ar+beam-treated PDMS surfaces. J Appl Polym Sci 2009. [DOI: 10.1002/app.29185] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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14
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Li M, Mann S. Emergent Hybrid Nanostructures Based on Non-Equilibrium Block Copolymer Self-Assembly. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200803231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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15
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Li M, Mann S. Emergent Hybrid Nanostructures Based on Non-Equilibrium Block Copolymer Self-Assembly. Angew Chem Int Ed Engl 2008; 47:9476-9. [DOI: 10.1002/anie.200803231] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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16
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Jewrajka SK, Erdodi G, Kennedy JP, Ely D, Dunphy G, Boehme S, Popescu F. Novel biostable and biocompatible amphiphilic membranes. J Biomed Mater Res A 2008; 87:69-77. [PMID: 18085659 DOI: 10.1002/jbm.a.31573] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We determined the biostability and biocompatibility of two types of amphiphilic conetworks (APCNs): (1) hydrophilic poly(N,N-dimethyl acrylamide) (PDMAAm) and hydrophobic polydimethylsiloxane (PDMS) microdomains co-crosslinked with polymethylhydrosiloxane (PMHS) clusters (PDMAAm/PMHS/PDMS), and (2) poly(ethylene glycol) (PEG) and PDMS microdomains co-crosslinked with two specially designed small-molecule crosslinking agents SiC(6)H(5)(SiH)(2)OEt (Y) and polypentamethylhydrocyclosiloxane (PD(5)) (PEG/Y or PD(5)/PDMS). Negative standards for comparing biocompatibility and biostability were crosslinked PDMS. Biostability was assessed by quantitatively determining extractables, equilibrium water swelling, mechanical properties (stress-strain response) of polymer samples before and after implantation in rats for up to 8 weeks, and oxidative accelerated degradation test. Biocompatibility was assessed by determining body weight, fibrous tissue encapsulation, fluid accumulation, and by histological evaluation of lymphocyte infiltration, fibrous tissue accumulation and collagen deposition. According to these stringent metrics PDMAAm/PMHS/PDMS is both biostable and biocompatible, whereas PEG/Y or PD(5)/PDMS degrades in living tissue but is biocompatible. Surprisingly, the overall biocompatibility scores of these APCNs were superior to those of the PDMS negative standard.
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Affiliation(s)
- Suresh K Jewrajka
- Institute of Polymer Science, The University of Akron, Akron, Ohio 44325, USA
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17
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Abstract
Synthetic polymer coatings are used extensively in modern medical devices and implants because of their material versatility and processability. These coatings are designed for specific applications by controlling composition and physical and chemical properties, and they can be formed into a variety of complex structures and shapes. However, implantation of these materials into the body elicits a strong inflammatory host response that significantly limits the integration and biological performance of devices. Biomaterial-mediated inflammation is a complex reaction involving protein adsorption, leukocyte recruitment and activation, secretion of inflammatory mediators, and fibrous encapsulation of the implant. Significant research efforts have focused on modifying material properties using various anti-inflammatory polymeric surface coatings to generate more biocompatible implants. This minireview provides a brief background on the events of biomaterial-mediated inflammation and highlights various approaches used for modifying material surfaces to modulate inflammatory responses. These include both passive and active strategies, such as nonfouling surface treatments and delivery of anti-inflammatory agents, respectively. Novel approaches will be needed to extend the in vivo lifetime and performance of devices and reduce the need for multiple implantation surgeries.
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Affiliation(s)
- Amanda W. Bridges
- Parker H. Petit Institute of Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia
| | - Andrés J. García
- Parker H. Petit Institute of Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia
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18
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Bhardwaj U, Papadimitrakopoulos F, Burgess DJ. A review of the development of a vehicle for localized and controlled drug delivery for implantable biosensors. J Diabetes Sci Technol 2008; 2:1016-29. [PMID: 19885291 PMCID: PMC2769817 DOI: 10.1177/193229680800200611] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A major obstacle to the development of implantable biosensors is the foreign body response (FBR) that results from tissue trauma during implantation and the continuous presence of the implant in the body. The in vivo stability and functionality of biosensors are compromised by damage to sensor components and decreased analyte transport to the sensor. This paper summarizes research undertaken by our group since 2001 to control the FBR toward implanted sensors. Localized and sustained delivery of the anti-inflammatory drug, dexamethasone, and the angiogenic growth factor, vascular endothelial growth factor (VEGF), was utilized to inhibit inflammation as well as fibrosis and provide a stable tissue-device interface without producing systemic adverse effects. The drug-loaded polylactic-co-glycolic acid (PLGA) microspheres were embedded in a polyvinyl alcohol (PVA) hydrogel composite to fabricate a drug-eluting, permeable external coating for implantable devices. The composites were fabricated using the freeze-thaw cycle method and had mechanical properties similar to soft body tissue. Dexamethasone-loaded microsphere/hydrogel composites were able to provide anti-inflammatory protection, preventing the FBR. Moreover, concurrent release of dexamethasone with VEGF induced neoangiogenesis in addition to providing anti-inflammatory protection. Sustained release of dexamethasone is required for the entire sensor lifetime, as a delayed inflammatory response developed after depletion of the drug from the composites. These studies have shown the potential of PLGA microsphere/PVA hydrogel-based composites as drug-eluting external coatings for implantable biosensors.
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Affiliation(s)
- Upkar Bhardwaj
- School of Pharmacy, University of Connecticut, Storrs, Connecticut
| | | | - Diane J. Burgess
- School of Pharmacy, University of Connecticut, Storrs, Connecticut
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19
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Schutte RJ, Xie L, Klitzman B, Reichert WM. In vivo cytokine-associated responses to biomaterials. Biomaterials 2008; 30:160-8. [PMID: 18849070 DOI: 10.1016/j.biomaterials.2008.09.026] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2008] [Accepted: 09/04/2008] [Indexed: 12/21/2022]
Abstract
Cytokines, chemokines, and growth factors were analyzed periodically over eight weeks from the wound exudate fluid surrounding biomaterials implanted subcutaneously within stainless steel mesh cages. TNF-alpha, MCP-1, MIP-1alpha, IL-2, IL-6, IL-1beta, VEGF, IL-4, and IL-10 were measured from exudate samples collected from cages containing specimens of polyethylene (PE), polyurethane (PU), or organotin polyvinyl chloride (ot-PVC). Empty cages served as negative controls, and lipopolysaccharide (LPS) served as a positive control. Cytokine, chemokine, and growth factor concentrations decreased from the time of implantation to eight weeks post-implantation, and there was an overall increase in cytokine, chemokine, and growth factor production for material-containing cages compared to empty cages. However, cytokine production was only modestly affected by the different surface chemistries of the three implanted polymeric materials.
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Affiliation(s)
- Robert J Schutte
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
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20
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Bridges AW, Singh N, Burns KL, Babensee JE, Andrew Lyon L, García AJ. Reduced acute inflammatory responses to microgel conformal coatings. Biomaterials 2008; 29:4605-15. [PMID: 18804859 DOI: 10.1016/j.biomaterials.2008.08.015] [Citation(s) in RCA: 99] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2008] [Accepted: 08/20/2008] [Indexed: 12/27/2022]
Abstract
Implantation of synthetic materials into the body elicits inflammatory host responses that limit medical device integration and biological performance. This inflammatory cascade involves protein adsorption, leukocyte recruitment and activation, cytokine release, and fibrous encapsulation of the implant. We present a coating strategy based on thin films of poly(N-isopropylacrylamide) hydrogel microparticles (i.e. microgels) cross-linked with poly(ethylene glycol) diacrylate. These particles were grafted onto a clinically relevant polymeric material to generate conformal coatings that significantly reduced in vitro fibrinogen adsorption and primary human monocyte/macrophage adhesion and spreading. These microgel coatings also reduced leukocyte adhesion and expression of pro-inflammatory cytokines (TNF-alpha, IL-1beta, MCP-1) in response to materials implanted acutely in the murine intraperitoneal space. These microgel coatings can be applied to biomedical implants as a protective coating to attenuate biofouling, leukocyte adhesion and activation, and adverse host responses for biomedical and biotechnological applications.
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Affiliation(s)
- Amanda W Bridges
- Petit Institute for Bioengineering and Bioscience, 315 Ferst Drive, 2314 IBB, Atlanta, GA 30332-0363, USA
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21
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Matloka PP, Kean Z, Greenfield M, Wagener KB. Synthesis and characterization of oligo(oxyethylene)/carbosilane copolymers for thermoset elastomers via ADMET. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/pola.22740] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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22
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Rowlands AS, Hudson JE, Cooper-White JJ. From scrawny to brawny: the quest for neomusculogenesis; smart surfaces and scaffolds for muscle tissue engineering. Expert Rev Med Devices 2007; 4:709-28. [PMID: 17850206 DOI: 10.1586/17434440.4.5.709] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The successful generation of functional muscle tissues requires both an in-depth knowledge of muscle tissue physiology and advanced engineering practices. The inherent contractile functionality of muscle is a result of its high-level cellular and matrix organization over a multitude of length scales. While there have been many attempts to produce artificial muscle, a method to fabricate a highly organized construct, comprised of multiple cell types and capable of delivering contractile strengths similar to that of native smooth, skeletal or cardiac muscle has remained elusive. This is largely due to a lack of control over phenotype and spatial organization of cells. This paper covers state-of-the-art approaches to generating both 2D and 3D substrates that provide some form of higher level organization or multiple biochemical, mechanical or electrical cues to cells in order to successfully manipulate their behavior, in a manner that is conducive to the production of contractile muscle tissue. These so-called 'smart surfaces' and 'smart scaffolds' represent vital steps towards surface-engineered substrates for the engineering of muscle tissues, showing confidently that cellular behavior can be effectively and reproducibly manipulated through the design of the physical, chemical and electrical properties of the substrates on which cells are grown. However, many challenges remain to be overcome prior to reaching the ultimate goal of fully functional 3D vascularized engineered muscle.
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Affiliation(s)
- Andrew S Rowlands
- Australian Institute for Bioengineering & Nanotechnology, Tissue Engineering and Microfluidics Laboratory, The University of Queensland, Brisbane, QLD 4072, Australia
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23
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Zelisko PM, Aguilar AL, Brook MA. Delivery of both active enzyme and bleach from water-in-silicone oil (D(4)) emulsions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:3620-5. [PMID: 17335258 DOI: 10.1021/la063340s] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Advanced cleaning formulations, such as liquid laundry packages, consist of many components that require a complex mixture of interfacial actives including silicones for foam control, bleach for brightening, and enzymes for stain removal. Many of these ingredients are mutually incompatible, particularly in liquid formulations where they can be in intimate contact over extended periods of time. Solid dispersions of a prototypical bleach, NaBO3, in silicone polyether surfactants were shown to be very stable over time, even in the presence of water-in-silicone (D(4)) emulsions containing the enzyme alpha-chymotrypsin. Normally, perborates undergo rapid decomposition on contact with water. The rate of denaturation of the enzyme in the emulsion was similarly unaffected by the presence of the bleach until the emulsion was broken, unlike the case where the polyether surfactant was not present. The polyether surfactant thus protects the perborate from hydration and the enzyme from denaturing on contact with silicone oil until excess water and high shear are applied to the emulsion; protective mechanisms are discussed.
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Affiliation(s)
- Paul M Zelisko
- Department of Chemistry, Brock University, 500 Glenridge Avenue, St. Catharines, Ontario, Canada L2S 3A1.
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Depan D, Kumar B, Singh RP. Preparation and characterization of novel hybrid of chitosan-g-PDMS and sodium montmorrilonite. J Biomed Mater Res B Appl Biomater 2007; 84:184-90. [PMID: 17514663 DOI: 10.1002/jbm.b.30860] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Preparation and properties of Chitosan (CS)-clay nanocomposites grafted with polydimethyl siloxane (PDMS) with different clay ratios are herein discussed. CS is intercalated into sodium montmorrilonite and PDMS is grafted onto CS under UV irradiation. Sample films of CS intercalated into clay and grafted with PDMS were prepared by solvent casting method with varying amount of nanoclay and PDMS. They were characterized by conventional techniques such as X-ray diffractometry, fourier transform infrared spectroscopy, (13)C NMR, thermo gravimetric analysis, and differential thermal analysis. Sorption behavior of samples has been followed by measuring swelling degree and issues on the interactions of biopolymers with clay are also discussed. The water absorption of composites films reduces with an increase in the amount of incorporated clay. This is due to the barrier formation in the form of cross-linking points, which prevents water permeation into CS. The amount of adsorbed water is more, when the amount of CS exceeds the amount of PDMS. This shows high water retention capacity of CS.
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Affiliation(s)
- Dilip Depan
- Division of Polymer Science and Engineering, National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411 008, India
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25
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Patil SD, Papadmitrakopoulos F, Burgess DJ. Concurrent delivery of dexamethasone and VEGF for localized inflammation control and angiogenesis. J Control Release 2007; 117:68-79. [PMID: 17169457 DOI: 10.1016/j.jconrel.2006.10.013] [Citation(s) in RCA: 161] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2006] [Revised: 09/21/2006] [Accepted: 10/03/2006] [Indexed: 10/24/2022]
Abstract
Localized elution of corticosteroids has been used in suppressing inflammation and fibrosis associated with implantation and continuous in vivo residence of bio-medical devices. However, these agents also inhibit endogenous growth factors preventing angiogenesis at the local tissue, interface thereby delaying the healing process and negatively impacting device performance. In this work, a combination of dexamethasone and vascular endothelial growth factor (VEGF) was investigated for concurrent localized delivery using PLGA microsphere/PVA hydrogel composites. Pharmacodynamic effects were evaluated by histopathological examination of subcutaneous tissue surrounding implanted composites using a rat model. The hydrogel composites were capable of simultaneously releasing VEGF and dexamethasone with approximately zero order kinetics. Composites were successful in controlling the implant/tissue interface by suppressing inflammation and fibrosis as well as facilitating neo-angiogenesis at a fraction of their typical oral or i.v. bolus doses. Implants containing VEGF showed a significantly higher number of mature blood vessels at the end of the 4 week study irrespective of the presence of dexamethasone. Thus, localized concurrent elution of VEGF and dexamethasone can overcome the anti-angiogenic effects of the corticosteroid and can be used to engineer inflammation-free and well-vascularized tissue in the vicinity of the implant. These PLGA microsphere/PVA hydrogel composites show promise as coatings for implantable bio-medical devices to improve biocompatibility and ensure in vivo performance.
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Affiliation(s)
- Siddhesh D Patil
- Department of Pharmaceutical Sciences, University of Connecticut, Storrs, CT 06269, United States
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Ko IK, Kato K, Iwata H. A thin carboxymethyl cellulose culture substrate for the cellulase-induced harvesting of an endothelial cell sheet. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2005; 16:1277-91. [PMID: 16268253 DOI: 10.1163/156856205774269511] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Engineered tissues constructed with two-dimensionally organized cells provide promising parts for reconstructing damaged tissues. Here we propose a new method for fabricating a 2D sheet made of an endothelial cell monolayer. First a culture substrate was prepared by treating the glass surface with an amine-terminated organosilicon derivative, followed by the covalent attachment of a thin carboxymethyl cellulose (CMC) layer. Fibronectin was immobilized onto the CMC-coated surface to promote cell adhesion. These surfaces were characterized step by step by means of contact angle measurement and X-ray photoelectron spectroscopy. Porcine aortic endothelial cells adhered to the culture substrate and consequently formed a confluent monolayer. When the substrate-cell composite was immersed in a cellulase solution, a cell sheet was spontaneously detached from the substrate due to enzymatic digestion of the CMC layer. The cell-cell connections were well preserved in the cell sheet, even after detachment from the substrate, most likely due to the fact that cellulase is harmless to mammalian cells. The cell sheet could be transferred to other culture dish with the aid of a hydrophilic membrane support, retaining the proliferation activity of the cells. The results obtained in this study demonstrate that cellulase treatment of the CMC layer is a rational and efficient method for obtaining a 2D cell sheet.
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Affiliation(s)
- In Kap Ko
- Institute for Frontier Medical Sciences, Kyoto University, 53 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan
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Matloka PP, Sworen JC, Zuluaga F, Wagener KB. Chain-End and Chain-Internal Crosslinking in ?Latent Reactive? Silicon Elastomers. MACROMOL CHEM PHYS 2005. [DOI: 10.1002/macp.200400335] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Wiggins MJ, MacEwan M, Anderson JM, Hiltner A. Effect of soft-segment chemistry on polyurethane biostability duringin vitro fatigue loading. ACTA ACUST UNITED AC 2004; 68:668-83. [PMID: 14986322 DOI: 10.1002/jbm.a.20081] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The effect of soft-segment chemistry on biostability of polyurethane elastomers was studied with a diaphragm-type film specimen under conditions of static and dynamic loading. During testing, the films were exposed to an H(2)O(2)/CoCl(2) solution, which simulated the oxidative component of the in vivo environment. Films treated for up to 24 days were evaluated by IR spectroscopy and by optical and scanning electron microscopy. Biostability of a poly(ether urethane) (PEU), which is known to undergo oxidative degradation, was compared with biostability of a poly(carbonate urethane) (PCU), which is thought to be more resistant to oxidation than PEU. Materials similar to PEU and PCU, in which the polyether or polycarbonate soft segment was partially replaced with poly(dimethylsiloxane) (PDMS), were also tested with the expectation that PDMS would improve soft-segment biostability. Oxidative degradation of the polyether soft segment of PEU was manifest chemically as chain scission and cross-linking and physically as surface pitting. Biaxial fatigue accelerated chemical degradation of PEU and eventually caused brittle stress cracking. In comparison, the polycarbonate soft segment was more stable to oxidation; there was minimal chemical or physical degradation of PCU, even in biaxial fatigue. Partial substitution of the polyether soft segment with PDMS enhanced oxidative stability of PEU. Although both strategies for modifying soft-segment chemistry improved the resistance to oxidative degradation, the outstanding mechanical properties of PEU were compromised to some extent.
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Affiliation(s)
- Michael J Wiggins
- Center for Applied Polymer Research, Case Western Reserve University, Cleveland, Ohio 44106, USA
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