1
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Jiang S, Wise SG, Kovacic JC, Rnjak-Kovacina J, Lord MS. Biomaterials containing extracellular matrix molecules as biomimetic next-generation vascular grafts. Trends Biotechnol 2024; 42:369-381. [PMID: 37852854 DOI: 10.1016/j.tibtech.2023.09.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 09/18/2023] [Accepted: 09/19/2023] [Indexed: 10/20/2023]
Abstract
The performance of synthetic biomaterial vascular grafts for the bypass of stenotic and dysfunctional blood vessels remains an intractable challenge in small-diameter applications. The functionalization of biomaterials with extracellular matrix (ECM) molecules is a promising approach because these molecules can regulate multiple biological processes in vascular tissues. In this review, we critically examine emerging approaches to ECM-containing vascular graft biomaterials and explore opportunities for future research and development toward clinical use.
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Affiliation(s)
- Shouyuan Jiang
- Graduate School of Biomedical Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - Steven G Wise
- School of Medical Sciences, Faculty of Health and Medicine, University of Sydney, Sydney, NSW 2006, Australia; Charles Perkins Centre, University of Sydney, Sydney, NSW 2006, Australia; The University of Sydney Nano Institute, University of Sydney, Sydney, NSW 2006, Australia
| | - Jason C Kovacic
- Victor Chang Cardiac Research Institute, Darlinghurst, NSW 2010, Australia; St Vincent's Clinical School, University of New South Wales, Darlinghurst, NSW 2010, Australia; Cardiovascular Research Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Jelena Rnjak-Kovacina
- Graduate School of Biomedical Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - Megan S Lord
- Graduate School of Biomedical Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
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2
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Zhang A, Wong JKU, Redzikultsava K, Baldry M, Alavi SK, Wang Z, van Koten E, Weiss A, Bilek M, Yeo GC, Akhavan B. A cost-effective and enhanced mesenchymal stem cell expansion platform with internal plasma-activated biofunctional interfaces. Mater Today Bio 2023; 22:100727. [PMID: 37529421 PMCID: PMC10388840 DOI: 10.1016/j.mtbio.2023.100727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 06/30/2023] [Accepted: 07/07/2023] [Indexed: 08/03/2023] Open
Abstract
Mesenchymal stem cells (MSCs) used for clinical applications require in vitro expansion to achieve therapeutically relevant numbers. However, conventional planar cell expansion approaches using tissue culture vessels are inefficient, costly, and can trigger MSC phenotypic and functional decline. Here we present a one-step dry plasma process to modify the internal surfaces of three-dimensional (3D) printed, high surface area to volume ratio (high-SA:V) porous scaffolds as platforms for stem cell expansion. To address the long-lasting challenge of uniform plasma treatment within the micrometre-sized pores of scaffolds, we developed a packed bed plasma immersion ion implantation (PBPI3) technology by which plasma is ignited inside porous materials for homogeneous surface activation. COMSOL Multiphysics simulations support our experimental data and provide insights into the role of electrical field and pressure distribution in plasma ignition. Spatial surface characterisation inside scaffolds demonstrates the homogeneity of PBPI3 activation. The PBPI3 treatment induces radical-containing chemical structures that enable the covalent attachment of biomolecules via a simple, non-toxic, single-step incubation process. We showed that PBPI3-treated scaffolds biofunctionalised with fibroblast growth factor 2 (FGF2) significantly promoted the expansion of MSCs, preserved cell phenotypic expression, and multipotency, while reducing the usage of costly growth factor supplements. This breakthrough PBPI3 technology can be applied to a wide range of 3D polymeric porous scaffolds, paving the way towards developing new biomimetic interfaces for tissue engineering and regenerative medicine.
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Affiliation(s)
- Anyu Zhang
- School of Biomedical Engineering, University of Sydney, NSW 2006, Australia
- School of Physics, University of Sydney, NSW 2006, Australia
- Sydney Nano Institute, University of Sydney, NSW 2006, Australia
| | - Johnny Kuan Un Wong
- Charles Perkins Centre, University of Sydney, NSW 2006, Australia
- School of Life and Environmental Sciences, University of Sydney, NSW 2006, Australia
- Sydney Nano Institute, University of Sydney, NSW 2006, Australia
| | - Katazhyna Redzikultsava
- School of Biomedical Engineering, University of Sydney, NSW 2006, Australia
- School of Physics, University of Sydney, NSW 2006, Australia
| | - Mark Baldry
- School of Biomedical Engineering, University of Sydney, NSW 2006, Australia
- School of Physics, University of Sydney, NSW 2006, Australia
- Sydney Nano Institute, University of Sydney, NSW 2006, Australia
| | - Seyedeh Kh Alavi
- School of Biomedical Engineering, University of Sydney, NSW 2006, Australia
- School of Physics, University of Sydney, NSW 2006, Australia
| | - Ziyu Wang
- Charles Perkins Centre, University of Sydney, NSW 2006, Australia
- School of Life and Environmental Sciences, University of Sydney, NSW 2006, Australia
| | | | - Anthony Weiss
- Charles Perkins Centre, University of Sydney, NSW 2006, Australia
- School of Life and Environmental Sciences, University of Sydney, NSW 2006, Australia
| | - Marcela Bilek
- School of Biomedical Engineering, University of Sydney, NSW 2006, Australia
- School of Physics, University of Sydney, NSW 2006, Australia
- Charles Perkins Centre, University of Sydney, NSW 2006, Australia
- Sydney Nano Institute, University of Sydney, NSW 2006, Australia
| | - Giselle C Yeo
- Charles Perkins Centre, University of Sydney, NSW 2006, Australia
- School of Life and Environmental Sciences, University of Sydney, NSW 2006, Australia
| | - Behnam Akhavan
- School of Biomedical Engineering, University of Sydney, NSW 2006, Australia
- School of Physics, University of Sydney, NSW 2006, Australia
- Sydney Nano Institute, University of Sydney, NSW 2006, Australia
- School of Engineering, University of Newcastle, Callaghan, NSW 2308, Australia
- Hunter Medical Research Institute (HMRI), Precision Medicine Program, New Lambton Heights, NSW, 2305, Australia
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3
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Avci-Adali M, Grözinger G, Cabane V, Schreve M, Wendel HP. Improving Bioactive Characteristics of Small Diameter Polytetrafluoroethylene Stent Grafts by Electrospinning: A Comparative Hemocompatibility Study. Bioengineering (Basel) 2023; 10:bioengineering10040411. [PMID: 37106598 PMCID: PMC10135465 DOI: 10.3390/bioengineering10040411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Revised: 03/11/2023] [Accepted: 03/21/2023] [Indexed: 03/29/2023] Open
Abstract
Polytetrafluoroethylene (PTFE) is a commonly used biomaterial for the manufacturing of vascular grafts and several strategies, such as coatings, have been explored to improve the hemocompatibility of small-diameter prostheses. In this study, the hemocompatibility properties of novel stent grafts covered with electrospun PTFE (LimFlow Gen-1 and LimFlow Gen-2) were compared with uncoated and heparin-coated PTFE grafts (Gore Viabahn®) using fresh human blood in a Chandler closed-loop system. After 60 min of incubation, the blood samples were examined hematologically and activation of coagulation, platelets, and the complement system were analyzed. In addition, the adsorbed fibrinogen on the stent grafts was measured and the thrombogenicity was assessed by SEM. Significantly lower adsorption of fibrinogen was measured on the surface of heparin-coated Viabahn than on the surface of the uncoated Viabahn. Furthermore, LimFlow Gen-1 stent grafts showed lower fibrinogen adsorption than the uncoated Viabahn®, and the LimFlow Gen-2 stent grafts showed comparable fibrinogen adsorption as the heparin-coated Viabahn®. SEM analysis revealed no sign of thrombus formation on any of the stent surfaces. LimFlow Gen-2 stent grafts covered with electrospun PTFE exhibited bioactive characteristics and revealed improved hemocompatibility in terms of reduced adhesion of fibrinogen, activation of platelets, and coagulation (assessed by β-TG and TAT levels) similar to heparin-coated ePTFE prostheses. Thus, this study demonstrated improved hemocompatibility of electrospun PTFE. The next step is to conduct in vivo studies to confirm whether electrospinning-induced changes to the PTFE surface can reduce the risk of thrombus formation and provide clinical benefits.
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Affiliation(s)
- Meltem Avci-Adali
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tuebingen, Calwerstraße 7/1, 72076 Tuebingen, Germany
- Correspondence: ; Tel.: +49-7071-2986605; Fax: +49-7071-295369
| | - Gerd Grözinger
- Department of Diagnostic and Interventional Radiology, University Hospital Tuebingen, Hoppe-Seyler-Strasse 3, 72076 Tuebingen, Germany
| | | | - Michiel Schreve
- LimFlow SA, 15 Rue Traversière, 75012 Paris, France
- Department of Surgery, Northwest Clinics, 1815 JD Alkmaar, The Netherlands
| | - Hans Peter Wendel
- Department of Thoracic and Cardiovascular Surgery, University Hospital Tuebingen, Calwerstraße 7/1, 72076 Tuebingen, Germany
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4
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Zizhou R, Wang X, Houshyar S. Review of Polymeric Biomimetic Small-Diameter Vascular Grafts to Tackle Intimal Hyperplasia. ACS OMEGA 2022; 7:22125-22148. [PMID: 35811906 PMCID: PMC9260943 DOI: 10.1021/acsomega.2c01740] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Accepted: 06/03/2022] [Indexed: 06/15/2023]
Abstract
Small-diameter artificial vascular grafts (SDAVG) are used to bypass blood flow in arterial occlusive diseases such as coronary heart or peripheral arterial disease. However, SDAVGs are plagued by restenosis after a short while due to thrombosis and the thickening of the neointimal wall known as intimal hyperplasia (IH). The specific causes of IH have not yet been deduced; however, thrombosis formation due to bioincompatibility as well as a mismatch between the biomechanical properties of the SDAVG and the native artery has been attributed to its initiation. The main challenges that have been faced in fabricating SDAVGs are facilitating rapid re-endothelialization of the luminal surface of the SDAVG and replicating the complex viscoelastic behavior of the arteries. Recent strategies to combat IH formation have been mostly based on imitating the natural structure and function of the native artery (biomimicry). Thus, most recently, developed grafts contain a multilayered structure with a designated function for each layer. This paper reviews the current polymeric, biomimetic SDAVGs in preventing the formation of IH. The materials used in fabrication, challenges, and strategies employed to tackle IH are summarized and discussed, and we focus on the multilayered structure of current SDAVGs. Additionally, the future aspects in this area are pointed out for researchers to consider in their endeavor.
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Affiliation(s)
- Rumbidzai Zizhou
- Center
for Materials Innovation and Future Fashion (CMIFF), School of Fashion
and Textiles, RMIT University, Brunswick 3056, Australia
| | - Xin Wang
- Center
for Materials Innovation and Future Fashion (CMIFF), School of Fashion
and Textiles, RMIT University, Brunswick 3056, Australia
| | - Shadi Houshyar
- School
of Engineering, RMIT University, Melbourne 3000, Australia
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5
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Yu L, Newton ER, Gillis DC, Sun K, Cooley BC, Keith AN, Sheiko SS, Tsihlis ND, Kibbe MR. Coating small-diameter ePTFE vascular grafts with tunable poly(diol-co-citrate-co-ascorbate) elastomers to reduce neointimal hyperplasia. Biomater Sci 2021; 9:5160-5174. [PMID: 34312627 DOI: 10.1039/d1bm00101a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Lack of long-term patency has hindered the clinical use of small-diameter prosthetic vascular grafts with the majority of these failures due to the development of neointimal hyperplasia. Previous studies by our laboratory revealed that small-diameter expanded polytetrafluoroethylene (ePTFE) grafts coated with antioxidant elastomers are a promising localized therapy to inhibit neointimal hyperplasia. This work is focused on the development of poly(diol-co-citrate-co-ascorbate) (POCA) elastomers with tunable properties for coating ePTFE vascular grafts. A bioactive POCA elastomer (@20 : 20 : 8, [citrate] : [diol] : [ascorbate]) coating was applied on a 1.5 mm diameter ePTFE vascular graft as the most promising therapeutic candidate for reducing neointimal hyperplasia. Surface ascorbate density on the POCA elastomer was increased to 67.5 ± 7.3 ng mg-1 cm-2. The mechanical, antioxidant, biodegradable, and biocompatible properties of POCA demonstrated desirable performance for in vivo use, inhibiting human aortic smooth muscle cell proliferation, while supporting human aortic endothelial cells. POCA elastomer coating number was adjusted by a modified spin-coating method to prepare small-diameter ePTFE vascular grafts similar to natural vessels. A significant reduction in neointimal hyperplasia was observed after implanting POCA-coated ePTFE vascular grafts in a guinea pig aortic interposition bypass graft model. POCA elastomer thus offers a new avenue that shows promise for use in vascular engineering to improve long-term patency rates by coating small-diameter ePTFE vascular grafts.
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Affiliation(s)
- Lu Yu
- Department of Surgery, University of North Carolina at Chapel Hill, 4001 Burnett-Womack Building, CB #7050, Chapel Hill, NC 27599-7050, USA.
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6
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Dimopoulos A, Markatos DN, Mitropoulou A, Panagiotopoulos I, Koletsis E, Mavrilas D. A novel polymeric fibrous microstructured biodegradable small-caliber tubular scaffold for cardiovascular tissue engineering. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2021; 32:21. [PMID: 33649939 PMCID: PMC7921057 DOI: 10.1007/s10856-021-06490-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 02/04/2021] [Indexed: 06/12/2023]
Abstract
Increasing morbidity of cardiovascular diseases in modern society has made it crucial to develop artificial small-caliber cardiovascular grafts for surgical intervention of diseased natural arteries, as alternatives to the gold standard autologous implants. Synthetic small-caliber grafts are still not in use due to increased risk of restenosis, lack of lumen re-endothelialization and mechanical mismatch, leading sometimes either to graft failure or to unsuccessful remodeling and pathology of the distal parts of the anastomosed healthy vascular tissues. In this work, we aimed to synthesize small-caliber polymeric (polycaprolactone) tissue-engineered vascular scaffolds that mimic the structure and biomechanics of natural vessels. Electrospinning was implemented to prepare microstructured polymeric membranes with controlled axis-parallel fiber alignment. Consequently, we designed small-caliber multilayer anisotropic biodegradable nanofibrous tubular scaffolds, giving attention to their radial compliance. Polycaprolactone scaffold morphology and mechanical properties were assessed, quantified, and compared with those of native vessels and commercial synthetic grafts. Results showed a highly hydrophobic scaffold material with a three-layered tubular morphology, 4-mm internal diameter/0.25 ± 0.09-mm thickness, consisting of predominantly axially aligned thin (1.156 ± 0.447 μm), homogeneous and continuous microfibers, with adequate (17.702 ± 5.369 μm) pore size, potentially able to promote cell infiltration in vivo. In vitro accelerated degradation showed a 5% mass loss within 17-25 weeks. Mechanical anisotropy was attained as a result, almost one order of magnitude difference of the elastic modulus (18 ± 3 MPa axially/1 ± 0.3 MPa circumferentially), like that of natural arterial walls. Furthermore, a desirable radial compliance (5.04 ± 0.82%, within the physiological pressure range) as well as cyclic stability of the tubular scaffold was achieved. Finally, cytotoxicity evaluation of the polymeric scaffolds revealed that the materials were nontoxic and did not release substances harmful to living cells (over 80% cell viability achieved).
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Affiliation(s)
- Andreas Dimopoulos
- Department of Mechanical Engineering and Aeronautics, Laboratory of Biomechanics and Biomedical Engineering, University of Patras, Patras, GR, Greece
| | - Dionysios N Markatos
- Department of Mechanical Engineering and Aeronautics, Laboratory of Biomechanics and Biomedical Engineering, University of Patras, Patras, GR, Greece
| | - Athina Mitropoulou
- Department of Mechanical Engineering and Aeronautics, Laboratory of Biomechanics and Biomedical Engineering, University of Patras, Patras, GR, Greece
| | - Ioannis Panagiotopoulos
- University Hospital, Cardiothoracic Surgery Clinic, University of Patras, Patras, GR, Greece
| | - Efstratios Koletsis
- University Hospital, Cardiothoracic Surgery Clinic, University of Patras, Patras, GR, Greece
| | - Dimosthenis Mavrilas
- Department of Mechanical Engineering and Aeronautics, Laboratory of Biomechanics and Biomedical Engineering, University of Patras, Patras, GR, Greece.
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7
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Tan RP, Hallahan N, Kosobrodova E, Michael PL, Wei F, Santos M, Lam YT, Chan AHP, Xiao Y, Bilek MMM, Thorn P, Wise SG. Bioactivation of Encapsulation Membranes Reduces Fibrosis and Enhances Cell Survival. ACS APPLIED MATERIALS & INTERFACES 2020; 12:56908-56923. [PMID: 33314916 DOI: 10.1021/acsami.0c20096] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Encapsulation devices are an emerging barrier technology designed to prevent the immunorejection of replacement cells in regenerative therapies for intractable diseases. However, traditional polymers used in current devices are poor substrates for cell attachment and induce fibrosis upon implantation, impacting long-term therapeutic cell viability. Bioactivation of polymer surfaces improves local host responses to materials, and here we make the first step toward demonstrating the utility of this approach to improve cell survival within encapsulation implants. Using therapeutic islet cells as an exemplar cell therapy, we show that internal surface coatings improve islet cell attachment and viability, while distinct external coatings modulate local foreign body responses. Using plasma surface functionalization (plasma immersion ion implantation (PIII)), we employ hollow fiber semiporous poly(ether sulfone) (PES) encapsulation membranes and coat the internal surfaces with the extracellular matrix protein fibronectin (FN) to enhance islet cell attachment. Separately, the external fiber surface is coated with the anti-inflammatory cytokine interleukin-4 (IL-4) to polarize local macrophages to an M2 (anti-inflammatory) phenotype, muting the fibrotic response. To demonstrate the power of our approach, bioluminescent murine islet cells were loaded into dual FN/IL-4-coated fibers and evaluated in a mouse back model for 14 days. Dual FN/IL-4 fibers showed striking reductions in immune cell accumulation and elevated levels of the M2 macrophage phenotype, consistent with the suppression of fibrotic encapsulation and enhanced angiogenesis. These changes led to markedly enhanced islet cell survival and importantly to functional integration of the implant with the host vasculature. Dual FN/IL-4 surface coatings drive multifaceted improvements in islet cell survival and function, with significant implications for improving clinical translation of therapeutic cell-containing macroencapsulation implants.
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Affiliation(s)
- Richard P Tan
- Department of Physiology, School of Medical Sciences, University of Sydney, Camperdown, NSW 2006, Australia
- Charles Perkins Centre, University of Sydney, John Hopkins Drive, Camperdown, NSW 2006, Australia
| | - Nicole Hallahan
- Department of Physiology, School of Medical Sciences, University of Sydney, Camperdown, NSW 2006, Australia
- Charles Perkins Centre, University of Sydney, John Hopkins Drive, Camperdown, NSW 2006, Australia
| | - Elena Kosobrodova
- Applied Plasma and Physics, A28, School of Physics, University of Sydney, Physics Road, Camperdown, NSW 2006, Australia
| | - Praveesuda L Michael
- Department of Physiology, School of Medical Sciences, University of Sydney, Camperdown, NSW 2006, Australia
- Charles Perkins Centre, University of Sydney, John Hopkins Drive, Camperdown, NSW 2006, Australia
| | - Fei Wei
- Institute of Health and Biomedical Innovation, Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, QLD 4000, Australia
| | - Miguel Santos
- Department of Physiology, School of Medical Sciences, University of Sydney, Camperdown, NSW 2006, Australia
- Charles Perkins Centre, University of Sydney, John Hopkins Drive, Camperdown, NSW 2006, Australia
| | - Yuen Ting Lam
- Department of Physiology, School of Medical Sciences, University of Sydney, Camperdown, NSW 2006, Australia
- Charles Perkins Centre, University of Sydney, John Hopkins Drive, Camperdown, NSW 2006, Australia
| | - Alex H P Chan
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA 94305, United States
| | - Yin Xiao
- Institute of Health and Biomedical Innovation, Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, QLD 4000, Australia
| | - Marcela M M Bilek
- Applied Plasma and Physics, A28, School of Physics, University of Sydney, Physics Road, Camperdown, NSW 2006, Australia
| | - Peter Thorn
- Department of Physiology, School of Medical Sciences, University of Sydney, Camperdown, NSW 2006, Australia
- Charles Perkins Centre, University of Sydney, John Hopkins Drive, Camperdown, NSW 2006, Australia
| | - Steven G Wise
- Department of Physiology, School of Medical Sciences, University of Sydney, Camperdown, NSW 2006, Australia
- Charles Perkins Centre, University of Sydney, John Hopkins Drive, Camperdown, NSW 2006, Australia
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8
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Oliveira S, Felizardo T, Amorim S, Mithieux SM, Pires RA, Reis RL, Martins A, Weiss AS, Neves NM. Tubular Fibrous Scaffolds Functionalized with Tropoelastin as a Small-Diameter Vascular Graft. Biomacromolecules 2020; 21:3582-3595. [PMID: 32678576 DOI: 10.1021/acs.biomac.0c00599] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Cardiovascular disorders are a healthcare problem in today's society. The clinically available synthetic vascular grafts are thrombogenic and could induce intimal hyperplasia. Rapid endothelialization and matched mechanical properties are two major requirements to be considered when designing functional vascular grafts. Herein, an electrospun tubular fibrous (eTF) scaffold was biofunctionalized with tropoelastin at the luminal surface. The luminal surface functionalization was confirmed by an increase of the zeta potential and by the insertion of NH2 groups. Tropoelastin was immobilized via its -NH2 or -COOH groups at the activated or aminolysed eTF scaffolds, respectively, to study the effect of exposed functional groups on human endothelial cells (ECs) behavior. Tensile properties demonstrated that functionalized eTF scaffolds presented strength and stiffness within the range of those of native blood vessels. Tropoelastin immobilized on activated eTF scaffolds promoted higher metabolic activity and proliferation of ECs, whereas when immobilized on aminolysed eTF scaffolds, significantly higher protein synthesis was observed. These biofunctional eTF scaffolds are a promising small-diameter vascular graft that promote rapid endothelialization and have compatible mechanical properties.
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Affiliation(s)
- Sofia Oliveira
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal.,ICVS/3B's-PT Government Associate Laboratory, 4806-909 Braga/Guimarães, Portugal
| | - Tatiana Felizardo
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal.,ICVS/3B's-PT Government Associate Laboratory, 4806-909 Braga/Guimarães, Portugal
| | - Sara Amorim
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal.,ICVS/3B's-PT Government Associate Laboratory, 4806-909 Braga/Guimarães, Portugal
| | - Suzanne M Mithieux
- School of Life and Environmental Sciences, University of Sydney, Sydney, NSW 2006, Australia.,Charles Perkins Centre, University of Sydney, Sydney, NSW 2006, Australia
| | - Ricardo A Pires
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal.,ICVS/3B's-PT Government Associate Laboratory, 4806-909 Braga/Guimarães, Portugal
| | - Rui L Reis
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal.,ICVS/3B's-PT Government Associate Laboratory, 4806-909 Braga/Guimarães, Portugal
| | - Albino Martins
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal.,ICVS/3B's-PT Government Associate Laboratory, 4806-909 Braga/Guimarães, Portugal
| | - Anthony S Weiss
- School of Life and Environmental Sciences, University of Sydney, Sydney, NSW 2006, Australia.,Charles Perkins Centre, University of Sydney, Sydney, NSW 2006, Australia.,Bosch Institute, University of Sydney, Sydney, NSW 2006, Australia
| | - Nuno M Neves
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal.,ICVS/3B's-PT Government Associate Laboratory, 4806-909 Braga/Guimarães, Portugal
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9
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Mi HY, Jiang Y, Jing X, Enriquez E, Li H, Li Q, Turng LS. Fabrication of triple-layered vascular grafts composed of silk fibers, polyacrylamide hydrogel, and polyurethane nanofibers with biomimetic mechanical properties. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 98:241-249. [DOI: 10.1016/j.msec.2018.12.126] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 12/09/2018] [Accepted: 12/28/2018] [Indexed: 12/21/2022]
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10
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Tan RP, Chan AH, Wei S, Santos M, Lee BS, Filipe EC, Akhavan B, Bilek MM, Ng MK, Xiao Y, Wise SG. Bioactive Materials Facilitating Targeted Local Modulation of Inflammation. JACC Basic Transl Sci 2019; 4:56-71. [PMID: 30847420 PMCID: PMC6390730 DOI: 10.1016/j.jacbts.2018.10.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 10/10/2018] [Accepted: 10/12/2018] [Indexed: 11/02/2022]
Abstract
Cardiovascular disease is an inflammatory disorder that may benefit from appropriate modulation of inflammation. Systemic treatments lower cardiac events but have serious adverse effects. Localized modulation of inflammation in current standard treatments such as bypass grafting may more effectively treat CAD. The present study investigated a bioactive vascular graft coated with the macrophage polarizing cytokine interleukin-4. These grafts repolarize macrophages to anti-inflammatory phenotypes, leading to modulation of the pro-inflammatory microenvironment and ultimately to a reduction of foreign body encapsulation and inhibition of neointimal hyperplasia development. These resulting functional improvements have significant implications for the next generation of synthetic vascular grafts.
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Affiliation(s)
- Richard P. Tan
- Heart Research Institute, Sydney, New South Wales, Australia
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - Alex H.P. Chan
- Heart Research Institute, Sydney, New South Wales, Australia
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - Simon Wei
- Science and Engineering Faculty, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Miguel Santos
- Heart Research Institute, Sydney, New South Wales, Australia
- School of Physics, University of Sydney, Sydney, New South Wales, Australia
| | - Bob S.L. Lee
- Heart Research Institute, Sydney, New South Wales, Australia
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - Elysse C. Filipe
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
- Garvan Institute of Medical Research, Cancer Division, Sydney, New South Wales, Australia
| | - Behnam Akhavan
- Heart Research Institute, Sydney, New South Wales, Australia
- School of Physics, University of Sydney, Sydney, New South Wales, Australia
- School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, New South Wales, Australia
| | - Marcela M. Bilek
- School of Physics, University of Sydney, Sydney, New South Wales, Australia
- School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, New South Wales, Australia
- Charles Perkins Centre, University of Sydney, Sydney, New South Wales, Australia
- Sydney Nano Institute, University of Sydney, Sydney, New South Wales, Australia
| | - Martin K.C. Ng
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
- Royal Prince Alfred Hospital, Sydney, New South Wales, Australia
| | - Yin Xiao
- Science and Engineering Faculty, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Steven G. Wise
- Heart Research Institute, Sydney, New South Wales, Australia
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
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11
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Radke D, Jia W, Sharma D, Fena K, Wang G, Goldman J, Zhao F. Tissue Engineering at the Blood-Contacting Surface: A Review of Challenges and Strategies in Vascular Graft Development. Adv Healthc Mater 2018; 7:e1701461. [PMID: 29732735 PMCID: PMC6105365 DOI: 10.1002/adhm.201701461] [Citation(s) in RCA: 136] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 02/09/2018] [Indexed: 12/14/2022]
Abstract
Tissue engineered vascular grafts (TEVGs) are beginning to achieve clinical success and hold promise as a source of grafting material when donor grafts are unsuitable or unavailable. Significant technological advances have generated small-diameter TEVGs that are mechanically stable and promote functional remodeling by regenerating host cells. However, developing a biocompatible blood-contacting surface remains a major challenge. The TEVG luminal surface must avoid negative inflammatory responses and thrombogenesis immediately upon implantation and promote endothelialization. The surface has therefore become a primary focus for research and development efforts. The current state of TEVGs is herein reviewed with an emphasis on the blood-contacting surface. General vascular physiology and developmental challenges and strategies are briefly described, followed by an overview of the materials currently employed in TEVGs. The use of biodegradable materials and stem cells requires careful control of graft composition, degradation behavior, and cell recruitment ability to ensure that a physiologically relevant vessel structure is ultimately achieved. The establishment of a stable monolayer of endothelial cells and the quiescence of smooth muscle cells are critical to the maintenance of patency. Several strategies to modify blood-contacting surfaces to resist thrombosis and control cellular recruitment are reviewed, including coatings of biomimetic peptides and heparin.
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Affiliation(s)
- Daniel Radke
- Department of Biomedical Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, U.S
| | - Wenkai Jia
- Department of Biomedical Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, U.S
| | - Dhavan Sharma
- Department of Biomedical Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, U.S
| | - Kemin Fena
- Department of Biomedical Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, U.S
| | - Guifang Wang
- Department of Biomedical Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, U.S
| | - Jeremy Goldman
- Department of Biomedical Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, U.S
| | - Feng Zhao
- Department of Biomedical Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, U.S
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12
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Filipe EC, Santos M, Hung J, Lee BS, Yang N, Chan AH, Ng MK, Rnjak-Kovacina J, Wise SG. Rapid Endothelialization of Off-the-Shelf Small Diameter Silk Vascular Grafts. JACC Basic Transl Sci 2018; 3:38-53. [PMID: 30062193 PMCID: PMC6058932 DOI: 10.1016/j.jacbts.2017.12.003] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 12/13/2017] [Accepted: 12/15/2017] [Indexed: 12/12/2022]
Abstract
Synthetic vascular grafts for small diameter revascularization are lacking. Clinically available conduits expanded polytetrafluorethylene and Dacron fail acutely due to thrombosis and in the longer term from neointimal hyperplasia. We report the bioengineering of a cell-free, silk-based vascular graft. In vitro we demonstrate strong, elastic silk conduits that support rapid endothelial cell attachment and spreading while simultaneously resisting blood clot and fibrin network formation. In vivo rat studies show complete graft patency at all time points, rapid endothelialization, and stabilization and contraction of neointimal hyperplasia. These studies show the potential of silk as an off-the-shelf small diameter vascular graft.
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Affiliation(s)
- Elysse C. Filipe
- Applied Materials Group, The Heart Research Institute, Sydney, New South Wales, Australia
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - Miguel Santos
- Applied Materials Group, The Heart Research Institute, Sydney, New South Wales, Australia
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - Juichien Hung
- Applied Materials Group, The Heart Research Institute, Sydney, New South Wales, Australia
| | - Bob S.L. Lee
- Applied Materials Group, The Heart Research Institute, Sydney, New South Wales, Australia
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - Nianji Yang
- Applied Materials Group, The Heart Research Institute, Sydney, New South Wales, Australia
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - Alex H.P. Chan
- Applied Materials Group, The Heart Research Institute, Sydney, New South Wales, Australia
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - Martin K.C. Ng
- Applied Materials Group, The Heart Research Institute, Sydney, New South Wales, Australia
- Department of Cardiology, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia
| | - Jelena Rnjak-Kovacina
- Graduate School of Biomedical Engineering, University of New South Wales–Sydney, Sydney, New South Wales, Australia
| | - Steven G. Wise
- Applied Materials Group, The Heart Research Institute, Sydney, New South Wales, Australia
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
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13
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Martin LJ, Akhavan B, Bilek MMM. Electric fields control the orientation of peptides irreversibly immobilized on radical-functionalized surfaces. Nat Commun 2018; 9:357. [PMID: 29367659 PMCID: PMC5783936 DOI: 10.1038/s41467-017-02545-6] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 12/07/2017] [Indexed: 01/12/2023] Open
Abstract
Surface functionalization of an implantable device with bioactive molecules can overcome adverse biological responses by promoting specific local tissue integration. Bioactive peptides have advantages over larger protein molecules due to their robustness and sterilizability. Their relatively small size presents opportunities to control the peptide orientation on approach to a surface to achieve favourable presentation of bioactive motifs. Here we demonstrate control of the orientation of surface-bound peptides by tuning electric fields at the surface during immobilization. Guided by computational simulations, a peptide with a linear conformation in solution is designed. Electric fields are used to control the peptide approach towards a radical-functionalized surface. Spontaneous, irreversible immobilization is achieved when the peptide makes contact with the surface. Our findings show that control of both peptide orientation and surface concentration is achieved simply by varying the solution pH or by applying an electric field as delivered by a small battery.
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Affiliation(s)
- Lewis J Martin
- School of Physics, University of Sydney, Sydney, NSW, 2006, Australia
| | - Behnam Akhavan
- School of Physics, University of Sydney, Sydney, NSW, 2006, Australia.
- School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, NSW, 2006, Australia.
| | - Marcela M M Bilek
- School of Physics, University of Sydney, Sydney, NSW, 2006, Australia.
- School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, NSW, 2006, Australia.
- Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia.
- University of Sydney Nano Institute, University of Sydney, Sydney, NSW, 2006, Australia.
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14
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Al Meslmani BM, Mahmoud GF, Bakowsky U. Development of expanded polytetrafluoroethylene cardiovascular graft platform based on immobilization of poly lactic-co-glycolic acid nanoparticles using a wet chemical modification technique. Int J Pharm 2017; 529:238-244. [PMID: 28689963 DOI: 10.1016/j.ijpharm.2017.06.091] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Revised: 06/16/2017] [Accepted: 06/30/2017] [Indexed: 10/19/2022]
Abstract
Expanded polytetrafluoroethylene ePTFE grafts are mostly employed to replace damaged blood vessels and to restore normal blood flow. However, the dilemma of early thrombosis, inflammation, and development of biofilms after implantation limit ePTFE long-term patency and restrict the patient's life quality. In this study, poly lactic-co-glycolic acid (PLGA) nanoparticles were covalently immobilized on ePTFE surface for local therapeutic purposes. First, the ePTFE surface was primarily oxidized by H2O2/H2SO4 solution to create hydroxyl groups. Consequently, free amino groups were introduced onto ePTFE surface by an aminolyzation reaction of the activated hydroxyl groups using 3-aminopropyl triethoxysilane. The produced amino groups were further used as anchor sites for covalent immobilization of previously prepared PLGA nanoparticles. The functional groups originated on ePTFE surface were confirmed by FTIR analysis. Furthermore, the scanning electron microscopy visualization evidenced a homogeneous distribution pattern of the immobilized PLGA nanoparticles on the surface. The immobilized PLGA nanoparticles showed stability on ePTFE surface under blood flow mimetic conditions. Additionally, light microscopy observation confirmed the biocompatibility of mouse L929 fibroblasts on the nano-coated ePTFE graft. The cellular adhesion and growth did not reveal remarkable cytotoxicity in the tested modified ePTFE grafts.
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Affiliation(s)
- Bassam M Al Meslmani
- Department of Pharmaceutical Technology and Biopharmaceutics, Philipps University, Robert-Koch-Str. 4, 35037, Marburg, Germany.
| | - Gihan F Mahmoud
- Department of Pharmaceutical Technology and Biopharmaceutics, Philipps University, Robert-Koch-Str. 4, 35037, Marburg, Germany; Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Helwan University, Ain Helwan, 11795, Cairo, Egypt.
| | - Udo Bakowsky
- Department of Pharmaceutical Technology and Biopharmaceutics, Philipps University, Robert-Koch-Str. 4, 35037, Marburg, Germany.
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15
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Kondyurina I, Wise SG, Ngo AKY, Filipe EC, Kondyurin A, Weiss AS, Bao S, Bilek MMM. Plasma mediated protein immobilisation enhances the vascular compatibility of polyurethane with tissue matched mechanical properties. Biomed Mater 2017; 12:045002. [DOI: 10.1088/1748-605x/aa6eb6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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16
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Simon-Yarza T, Bataille I, Letourneur D. Cardiovascular Bio-Engineering: Current State of the Art. J Cardiovasc Transl Res 2017; 10:180-193. [DOI: 10.1007/s12265-017-9740-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 02/24/2017] [Indexed: 12/15/2022]
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