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Conner AA, David D, Yim EKF. The Effects of Biomimetic Surface Topography on Vascular Cells: Implications for Vascular Conduits. Adv Healthc Mater 2024:e2400335. [PMID: 38935920 DOI: 10.1002/adhm.202400335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2024] [Revised: 06/04/2024] [Indexed: 06/29/2024]
Abstract
Cardiovascular diseases (CVDs) are the leading cause of mortality worldwide and represent a pressing clinical need. Vascular occlusions are the predominant cause of CVD and necessitate surgical interventions such as bypass graft surgery to replace the damaged or obstructed blood vessel with a synthetic conduit. Synthetic small-diameter vascular grafts (sSDVGs) are desired to bypass blood vessels with an inner diameter <6 mm yet have limited use due to unacceptable patency rates. The incorporation of biophysical cues such as topography onto the sSDVG biointerface can be used to mimic the cellular microenvironment and improve outcomes. In this review, the utility of surface topography in sSDVG design is discussed. First, the primary challenges that sSDVGs face and the rationale for utilizing biomimetic topography are introduced. The current literature surrounding the effects of topographical cues on vascular cell behavior in vitro is reviewed, providing insight into which features are optimal for application in sSDVGs. The results of studies that have utilized topographically-enhanced sSDVGs in vivo are evaluated. Current challenges and barriers to clinical translation are discussed. Based on the wealth of evidence detailed here, substrate topography offers enormous potential to improve the outcome of sSDVGs and provide therapeutic solutions for CVDs.
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Affiliation(s)
- Abigail A Conner
- Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada
| | - Dency David
- Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada
| | - Evelyn K F Yim
- Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada
- Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada
- Center for Biotechnology and Bioengineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada
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2
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Hülsmann J, Fraune T, Dodawatta B, Reuter F, Beutner M, Beck V, Hackert-Oschätzchen M, Ohl CD, Bettenbrock K, Janiga G, Wippermann J, Wacker M. Integrated biophysical matching of bacterial nanocellulose coronary artery bypass grafts towards bioinspired artery typical functions. Sci Rep 2023; 13:18274. [PMID: 37880281 PMCID: PMC10600183 DOI: 10.1038/s41598-023-45451-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Accepted: 10/19/2023] [Indexed: 10/27/2023] Open
Abstract
Revascularization via coronary artery bypass grafting (CABG) to treat cardiovascular disease is established as one of the most important lifesaving surgical techniques worldwide. But the shortage in functionally self-adaptive autologous arteries leads to circumstances where the clinical reality must deal with fighting pathologies coming from the mismatching biophysical functionality of more available venous grafts. Synthetic biomaterial-based CABG grafts did not make it to the market yet, what is mostly due to technical hurdles in matching biophysical properties to the complex demands of the CABG niche. But bacterial Nanocellulose (BNC) Hydrogels derived by growing biofilms hold a naturally integrative character in function-giving properties by its freedom in designing form and intrinsic fiber architecture. In this study we use this integral to combine impacts on the luminal fiber matrix, biomechanical properties and the reciprocal stimulation of microtopography and induced flow patterns, to investigate biomimetic and artificial designs on their bio-functional effects. Therefore, we produced tubular BNC-hydrogels at distinctive designs, characterized the structural and biomechanical properties and subjected them to in vitro endothelial colonization in bioreactor assisted perfusion cultivation. Results showed clearly improved functional properties and gave an indication of successfully realized stimulation by artery-typical helical flow patterns.
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Affiliation(s)
- Jörn Hülsmann
- Department for Cardiac Surgery, Medical Faculty, Otto von Guericke University, Magdeburg, Germany.
| | - Theresa Fraune
- Department for Cardiac Surgery, Medical Faculty, Otto von Guericke University, Magdeburg, Germany
| | - Baratha Dodawatta
- Laboratory of Fluid Dynamics and Technical Flows, Otto von Guericke University, Magdeburg, Germany
| | - Fabian Reuter
- Department Soft Matter, Otto von Guericke University, Magdeburg, Germany
| | - Martin Beutner
- Chair of Manufacturing Technology with Focus Machining, Institute of Manufacturing Technology and Quality Management, Otto von Guericke University, Magdeburg, Germany
| | - Viktoria Beck
- Department for Cardiac Surgery, Medical Faculty, Otto von Guericke University, Magdeburg, Germany
| | - Matthias Hackert-Oschätzchen
- Chair of Manufacturing Technology with Focus Machining, Institute of Manufacturing Technology and Quality Management, Otto von Guericke University, Magdeburg, Germany
| | - Claus Dieter Ohl
- Department Soft Matter, Otto von Guericke University, Magdeburg, Germany
| | - Katja Bettenbrock
- Max Plank Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany
| | - Gabor Janiga
- Laboratory of Fluid Dynamics and Technical Flows, Otto von Guericke University, Magdeburg, Germany
| | - Jens Wippermann
- Department for Cardiac Surgery, Medical Faculty, Otto von Guericke University, Magdeburg, Germany
| | - Max Wacker
- Department for Cardiac Surgery, Medical Faculty, Otto von Guericke University, Magdeburg, Germany
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3
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Ibrahim DM, Fomina A, Bouten CVC, Smits AIPM. Functional regeneration at the blood-biomaterial interface. Adv Drug Deliv Rev 2023; 201:115085. [PMID: 37690484 DOI: 10.1016/j.addr.2023.115085] [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: 10/31/2022] [Revised: 06/01/2023] [Accepted: 09/07/2023] [Indexed: 09/12/2023]
Abstract
The use of cardiovascular implants is commonplace in clinical practice. However, reproducing the key bioactive and adaptive properties of native cardiovascular tissues with an artificial replacement is highly challenging. Exciting new treatment strategies are under development to regenerate (parts of) cardiovascular tissues directly in situ using immunomodulatory biomaterials. Direct exposure to the bloodstream and hemodynamic loads is a particular challenge, given the risk of thrombosis and adverse remodeling that it brings. However, the blood is also a source of (immune) cells and proteins that dominantly contribute to functional tissue regeneration. This review explores the potential of the blood as a source for the complete or partial in situ regeneration of cardiovascular tissues, with a particular focus on the endothelium, being the natural blood-tissue barrier. We pinpoint the current scientific challenges to enable rational engineering and testing of blood-contacting implants to leverage the regenerative potential of the blood.
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Affiliation(s)
- Dina M Ibrahim
- Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands; Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, the Netherlands.
| | - Aleksandra Fomina
- Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands; Graduate School of Life Sciences, Utrecht University, Utrecht, the Netherlands.
| | - Carlijn V C Bouten
- Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands; Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, the Netherlands.
| | - Anthal I P M Smits
- Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands; Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, the Netherlands.
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4
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Fallon ME, Le HH, Bates NM, Yao Y, Yim EK, Hinds MT, Anderson DE. Hemocompatibility of micropatterned biomaterial surfaces is dependent on topographical feature size. Front Physiol 2022; 13:983187. [PMID: 36200053 PMCID: PMC9527343 DOI: 10.3389/fphys.2022.983187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Accepted: 08/18/2022] [Indexed: 11/13/2022] Open
Abstract
Small-diameter synthetic vascular grafts that have improved hemocompatibility and patency remain an unmet clinical need due to thrombosis. A surface modification that has potential to attenuate these failure mechanisms while promoting an endothelial layer is the micropatterning of luminal surfaces. Anisotropic features have been shown to downregulate smooth muscle cell proliferation, direct endothelial migration, and attenuate platelet adhesion and activation. However, the effect of micropatterning feature size and orientation relative to whole blood flow has yet to be investigated within a systematic study. In this work, hemocompatibility of micropattern grating sizes of 2, 5, and 10 µm were investigated. The thrombogenicity of the micropattern surface modifications were characterized by quantifying FXIIa activity, fibrin formation, and static platelet adhesion in vitro. Additionally, dynamic platelet attachment and end-point fibrin formation were quantified using an established, flowing whole blood ex vivo non-human primate shunt model without antiplatelet or anticoagulant therapies. We observed a higher trend in platelet attachment and significantly increased fibrin formation for larger features. We then investigated the orientation of 2 µm gratings relative to whole blood flow and found no significant differences between the various orientations for platelet attachment, rate of linear platelet attachment, or end-point fibrin formation. MicroCT analysis of micropatterned grafts was utilized to quantify luminal patency. This work is a significant step in the development of novel synthetic biomaterials with improved understanding of hemocompatibility for use in cardiovascular applications.
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Affiliation(s)
- Meghan E. Fallon
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, OR, United States
| | - Hillary H. Le
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, OR, United States
| | - Novella M. Bates
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, OR, United States
| | - Yuan Yao
- Department of Chemical Engineering, University of Waterloo, Waterloo, ON, Canada
| | - Evelyn K.F. Yim
- Department of Chemical Engineering, University of Waterloo, Waterloo, ON, Canada
| | - Monica T. Hinds
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, OR, United States
| | - Deirdre E.J. Anderson
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, OR, United States
- *Correspondence: Deirdre E.J. Anderson,
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Zhuang Y, Zhang C, Cheng M, Huang J, Liu Q, Yuan G, Lin K, Yu H. Challenges and strategies for in situ endothelialization and long-term lumen patency of vascular grafts. Bioact Mater 2021; 6:1791-1809. [PMID: 33336112 PMCID: PMC7721596 DOI: 10.1016/j.bioactmat.2020.11.028] [Citation(s) in RCA: 75] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2020] [Revised: 11/11/2020] [Accepted: 11/24/2020] [Indexed: 02/08/2023] Open
Abstract
Vascular diseases are the most prevalent cause of ischemic necrosis of tissue and organ, which even result in dysfunction and death. Vascular regeneration or artificial vascular graft, as the conventional treatment modality, has received keen attentions. However, small-diameter (diameter < 4 mm) vascular grafts have a high risk of thrombosis and intimal hyperplasia (IH), which makes long-term lumen patency challengeable. Endothelial cells (ECs) form the inner endothelium layer, and are crucial for anti-coagulation and thrombogenesis. Thus, promoting in situ endothelialization in vascular graft remodeling takes top priority, which requires recruitment of endothelia progenitor cells (EPCs), migration, adhesion, proliferation and activation of EPCs and ECs. Chemotaxis aimed at ligands on EPC surface can be utilized for EPC homing, while nanofibrous structure, biocompatible surface and cell-capturing molecules on graft surface can be applied for cell adhesion. Moreover, cell orientation can be regulated by topography of scaffold, and cell bioactivity can be modulated by growth factors and therapeutic genes. Additionally, surface modification can also reduce thrombogenesis, and some drug release can inhibit IH. Considering the influence of macrophages on ECs and smooth muscle cells (SMCs), scaffolds loaded with drugs that can promote M2 polarization are alternative strategies. In conclusion, the advanced strategies for enhanced long-term lumen patency of vascular grafts are summarized in this review. Strategies for recruitment of EPCs, adhesion, proliferation and activation of EPCs and ECs, anti-thrombogenesis, anti-IH, and immunomodulation are discussed. Ideal vascular grafts with appropriate surface modification, loading and fabrication strategies are required in further studies.
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Affiliation(s)
- Yu Zhuang
- Department of Oral and Cranio-maxillofacial Surgery, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China
- National Clinical Research Center for Oral Diseases, Shanghai, 200011, China
- Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, Shanghai, 200011, China
| | - Chenglong Zhang
- Department of Oral and Cranio-maxillofacial Surgery, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China
- National Clinical Research Center for Oral Diseases, Shanghai, 200011, China
- Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, Shanghai, 200011, China
| | - Mengjia Cheng
- Department of Oral and Cranio-maxillofacial Surgery, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China
- National Clinical Research Center for Oral Diseases, Shanghai, 200011, China
- Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, Shanghai, 200011, China
| | - Jinyang Huang
- Department of Oral and Cranio-maxillofacial Surgery, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China
- National Clinical Research Center for Oral Diseases, Shanghai, 200011, China
- Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, Shanghai, 200011, China
| | - Qingcheng Liu
- Department of Oral and Cranio-maxillofacial Surgery, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China
- National Clinical Research Center for Oral Diseases, Shanghai, 200011, China
- Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, Shanghai, 200011, China
| | - Guangyin Yuan
- National Engineering Research Center of Light Alloy Net Forming & State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
| | - Kaili Lin
- Department of Oral and Cranio-maxillofacial Surgery, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China
- National Clinical Research Center for Oral Diseases, Shanghai, 200011, China
- Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, Shanghai, 200011, China
| | - Hongbo Yu
- Department of Oral and Cranio-maxillofacial Surgery, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, China
- National Clinical Research Center for Oral Diseases, Shanghai, 200011, China
- Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, Shanghai, 200011, China
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Gorji A, Toh PJY, Ong HT, Toh YC, Toyama Y, Kanchanawong P. Enhancement of Endothelialization by Topographical Features Is Mediated by PTP1B-Dependent Endothelial Adherens Junctions Remodeling. ACS Biomater Sci Eng 2021; 7:2661-2675. [PMID: 33942605 DOI: 10.1021/acsbiomaterials.1c00251] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Endothelial Cells (ECs) form cohesive cellular lining of the vasculature and play essential roles in both developmental processes and pathological conditions. Collective migration and proliferation of endothelial cells (ECs) are key processes underlying endothelialization of vessels as well as vascular graft, but the complex interplay of mechanical and biochemical signals regulating these processes are still not fully elucidated. While surface topography and biochemical modifications have been used to enhance endothelialization in vitro, thus far such single-modality modifications have met with limited success. As combination therapy that utilizes multiple modalities has shown improvement in addressing various intractable and complex biomedical conditions, here, we explore a combined strategy that utilizes topographical features in conjunction with pharmacological perturbations. We characterized EC behaviors in response to micrometer-scale grating topography in concert with pharmacological perturbations of endothelial adherens junctions (EAJ) regulators. We found that the protein tyrosine phosphatase, PTP1B, serves as a potent regulator of EAJ stability, with PTP1B inhibition synergizing with grating topographies to modulate EAJ rearrangement, thereby augmenting global EC monolayer sheet orientation, proliferation, connectivity, and collective cell migration. Our data delineates the crosstalk between cell-ECM topography sensing and cell-cell junction integrity maintenance and suggests that the combined use of grating topography and PTP1B inhibitor could be a promising strategy for promoting collective EC migration and proliferation.
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Affiliation(s)
- Azita Gorji
- Mechanobiology Institute, National University of Singapore, 117411 Republic of Singapore.,Institut Curie, Laboratoire Physico Chimie Curie, Institut Pierre-Gilles de Gennes, CNRS UMR168, Paris 75005, France
| | - Pearlyn Jia Ying Toh
- Mechanobiology Institute, National University of Singapore, 117411 Republic of Singapore
| | - Hui Ting Ong
- Mechanobiology Institute, National University of Singapore, 117411 Republic of Singapore
| | - Yi-Chin Toh
- Department of Biomedical Engineering, National University of Singapore, 117583 Republic of Singapore.,Institute for Health Innovation and Technology, National University of Singapore, 117599 Republic of Singapore.,The N.1 Institute for Health, National University of Singapore, 117456, Republic of Singapore.,NUS Tissue Engineering Programme, National University of Singapore, 117456, Republic of Singapore
| | - Yusuke Toyama
- Mechanobiology Institute, National University of Singapore, 117411 Republic of Singapore.,Department of Biological Sciences, National University of Singapore, 117558, Republic of Singapore
| | - Pakorn Kanchanawong
- Mechanobiology Institute, National University of Singapore, 117411 Republic of Singapore.,Department of Biomedical Engineering, National University of Singapore, 117583 Republic of Singapore
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Antonova L, Kutikhin A, Sevostianova V, Velikanova E, Matveeva V, Glushkova T, Mironov A, Krivkina E, Shabaev A, Senokosova E, Barbarash L. bFGF and SDF-1α Improve In Vivo Performance of VEGF-Incorporating Small-Diameter Vascular Grafts. Pharmaceuticals (Basel) 2021; 14:ph14040302. [PMID: 33800631 PMCID: PMC8065794 DOI: 10.3390/ph14040302] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 03/21/2021] [Accepted: 03/25/2021] [Indexed: 12/01/2022] Open
Abstract
Tissue-engineered vascular grafts are widely tested as a promising substitute for both arterial bypass and replacement surgery. We previously demonstrated that incorporation of VEGF into electrospun tubular scaffolds from poly(3-hydroxybutyrate-co-3-hydroxyvalerate)/poly(ε-caprolactone) enhances formation of an endothelial cell monolayer. However, an overdose of VEGF can induce tumor-like vasculature; thereby, other bioactive factors are needed to support VEGF-driven endothelialization and successful recruitment of smooth muscle cells. Utilizing emulsion electrospinning, we fabricated one-layer vascular grafts with either VEGF, bFGF, or SDF-1α, and two-layer vascular grafts with VEGF incorporated into the inner layer and bFGF and SDF-1α incorporated into the outer layer with the following structural evaluation, tensile testing, and in vivo testing using a rat abdominal aorta replacement model. The latter graft prototype showed higher primary patency rate. We found that the two-layer structure improved surface topography and mechanical properties of the grafts. Further, the combination of bFGF, SDF-1α, and VEGF improved endothelialization compared with VEGF alone, while bFGF induced a rapid formation of a smooth muscle cell layer. Taken together, these findings show that the two-layer structure and incorporation of bFGF and SDF-1α into the vascular grafts in combination with VEGF provide a higher primary patency and therefore improved in vivo performance.
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8
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Sunami H, Shimizu Y, Denda J, Yokota I, Kishimoto H, Igarashi Y. A 3D Microfabricated Scaffold System for Unidirectional Cell Migration. ACTA ACUST UNITED AC 2020; 4:e2000113. [PMID: 32924291 DOI: 10.1002/adbi.202000113] [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: 04/24/2020] [Revised: 08/02/2020] [Indexed: 11/08/2022]
Abstract
The present study demonstrates unidirectional cell migration using a novel 3D microfabricated scaffold, as revealed by the uneven sorting of cells into an area of 1 mm × 1 mm. To induce unidirectional cell migration, it is important to determine the optimal arrangement of 3D edges, and thus, the anisotropic periodic structures of micropatterns are adjusted appropriately. The cells put forth protrusions directionally along the sharp edges of these micropatterns, and migrated in the protruding direction. There are three advantages to this novel system. First, the range of applications is wide, because this system effectively induces unidirectional migration as long as 3D shapes of the scaffolds are maintained. Second, this system can contribute to the field of cell biology as a novel taxis assay. Third, this system is highly applicable to the development of medical devices. In the present report, unique 3D microfabricated scaffolds that provoked unidirectional migration of NIH3T3 cells are described. The 3D scaffolds could provoke cells to accumulate in a single target location, or could provoke a dissipated cell distribution. Because the shapes are very simple, they could be applied to the surfaces of various medical devices. Their utilization as a cell separation technology is also anticipated.
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Affiliation(s)
- Hiroshi Sunami
- Faculty of Medicine, University of the Ryukyus, Nishihara, 903-0215, Japan
| | - Yusuke Shimizu
- Faculty of Medicine, University of the Ryukyus, Nishihara, 903-0215, Japan
| | - Junko Denda
- Faculty of Medicine, University of the Ryukyus, Nishihara, 903-0215, Japan
| | - Ikuko Yokota
- Faculty of Advanced Life Science, Hokkaido University, Sapporo, 001-0021, Japan
| | - Hidehiro Kishimoto
- Faculty of Medicine, University of the Ryukyus, Nishihara, 903-0215, Japan
| | - Yasuyuki Igarashi
- Faculty of Advanced Life Science, Hokkaido University, Sapporo, 001-0021, Japan
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9
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Antonova LV, Mironov AV, Yuzhalin AE, Krivkina EO, Shabaev AR, Rezvova MA, Tkachenko VO, Khanova MY, Sergeeva TY, Krutitskiy SS, Barbarash LS. A Brief Report on an Implantation of Small-Caliber Biodegradable Vascular Grafts in a Carotid Artery of the Sheep. Pharmaceuticals (Basel) 2020; 13:E101. [PMID: 32455730 PMCID: PMC7280958 DOI: 10.3390/ph13050101] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Revised: 05/14/2020] [Accepted: 05/19/2020] [Indexed: 12/31/2022] Open
Abstract
The development of novel biodegradable vascular grafts of a small diameter (<6 mm) is an unmet clinical need for patients requiring arterial replacement. Here we performed a pre-clinical study of new small-caliber biodegradable vascular grafts using a sheep model of carotid artery implantation. The 4 mm diameter vascular grafts were manufactured using a mix of polyhydroxybutyrate/valerate and polycaprolactone supplemented with growth factors VEGF, bFGF and SDF-1α (PHBV/PCL-GFmix) and additionally modified by a polymer hydrogel coating with incorporation of drugs heparin and iloprost (PHBV/PCL-GFmixHep/Ilo). Animals with carotid artery autograft implantation and those implanted with clinically used GORE-TEX® grafts were used as control groups. We observed that 24 h following surgery, animals with carotid artery autograft implantation showed 87.5% patency, while all the PHBV/PCL-GFmix and GORE-TEX® grafts displayed thrombosis. PHBV/PCL-GFmixHep/Ilo grafts demonstrated 62.5% patency 24 h following surgery and it had remained at 50% 1 year post-operation. All the PHBV/PCL grafts completely degraded less than 1 year following surgery and were replaced by de novo vasculature without evidence of calcification. On the other hand, GORE-TEX® grafts displayed substantial amounts of calcium deposits throughout graft tissues. Thus, here we report a potential clinical usefulness of PHBV/PCL grafts upon their additional modification by growth factors and drugs to promote endothelialization and reduce thrombogenicity.
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Affiliation(s)
- Larisa V. Antonova
- Research Institute for Complex Issues of Cardiovascular Diseases, 6 Sosnovy Blvd, Kemerovo 650002, Russia; (L.V.A.); (A.V.M.); (E.O.K.); (A.R.S.); (M.A.R.); (M.Y.K.); (T.Y.S.); (S.S.K.); (L.S.B.)
| | - Andrey V. Mironov
- Research Institute for Complex Issues of Cardiovascular Diseases, 6 Sosnovy Blvd, Kemerovo 650002, Russia; (L.V.A.); (A.V.M.); (E.O.K.); (A.R.S.); (M.A.R.); (M.Y.K.); (T.Y.S.); (S.S.K.); (L.S.B.)
| | - Arseniy E. Yuzhalin
- Research Institute for Complex Issues of Cardiovascular Diseases, 6 Sosnovy Blvd, Kemerovo 650002, Russia; (L.V.A.); (A.V.M.); (E.O.K.); (A.R.S.); (M.A.R.); (M.Y.K.); (T.Y.S.); (S.S.K.); (L.S.B.)
| | - Evgeniya O. Krivkina
- Research Institute for Complex Issues of Cardiovascular Diseases, 6 Sosnovy Blvd, Kemerovo 650002, Russia; (L.V.A.); (A.V.M.); (E.O.K.); (A.R.S.); (M.A.R.); (M.Y.K.); (T.Y.S.); (S.S.K.); (L.S.B.)
| | - Amin R. Shabaev
- Research Institute for Complex Issues of Cardiovascular Diseases, 6 Sosnovy Blvd, Kemerovo 650002, Russia; (L.V.A.); (A.V.M.); (E.O.K.); (A.R.S.); (M.A.R.); (M.Y.K.); (T.Y.S.); (S.S.K.); (L.S.B.)
| | - Maria A. Rezvova
- Research Institute for Complex Issues of Cardiovascular Diseases, 6 Sosnovy Blvd, Kemerovo 650002, Russia; (L.V.A.); (A.V.M.); (E.O.K.); (A.R.S.); (M.A.R.); (M.Y.K.); (T.Y.S.); (S.S.K.); (L.S.B.)
| | - Vadim O. Tkachenko
- Budker Institute of Nuclear Physics SB RAS, 11 akademika Lavrentieva Ave, Novosibirsk 630090, Russia;
| | - Mariam Yu. Khanova
- Research Institute for Complex Issues of Cardiovascular Diseases, 6 Sosnovy Blvd, Kemerovo 650002, Russia; (L.V.A.); (A.V.M.); (E.O.K.); (A.R.S.); (M.A.R.); (M.Y.K.); (T.Y.S.); (S.S.K.); (L.S.B.)
| | - Tatiana Yu. Sergeeva
- Research Institute for Complex Issues of Cardiovascular Diseases, 6 Sosnovy Blvd, Kemerovo 650002, Russia; (L.V.A.); (A.V.M.); (E.O.K.); (A.R.S.); (M.A.R.); (M.Y.K.); (T.Y.S.); (S.S.K.); (L.S.B.)
| | - Sergei S. Krutitskiy
- Research Institute for Complex Issues of Cardiovascular Diseases, 6 Sosnovy Blvd, Kemerovo 650002, Russia; (L.V.A.); (A.V.M.); (E.O.K.); (A.R.S.); (M.A.R.); (M.Y.K.); (T.Y.S.); (S.S.K.); (L.S.B.)
| | - Leonid S. Barbarash
- Research Institute for Complex Issues of Cardiovascular Diseases, 6 Sosnovy Blvd, Kemerovo 650002, Russia; (L.V.A.); (A.V.M.); (E.O.K.); (A.R.S.); (M.A.R.); (M.Y.K.); (T.Y.S.); (S.S.K.); (L.S.B.)
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10
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Wang Z, Liu C, Zhu D, Gu X, Xu Y, Qin Q, Dong N, Zhang S, Wang J. Untangling the co-effects of oriented nanotopography and sustained anticoagulation in a biomimetic intima on neovessel remodeling. Biomaterials 2020; 231:119654. [DOI: 10.1016/j.biomaterials.2019.119654] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2019] [Revised: 11/25/2019] [Accepted: 11/26/2019] [Indexed: 12/31/2022]
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11
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Topography elicits distinct phenotypes and functions in human primary and stem cell derived endothelial cells. Biomaterials 2020; 234:119747. [PMID: 31951971 DOI: 10.1016/j.biomaterials.2019.119747] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 11/25/2019] [Accepted: 12/25/2019] [Indexed: 12/20/2022]
Abstract
The effective deployment of arterial (AECs), venous (VECs) and stem cell-derived endothelial cells (PSC-ECs) in clinical applications requires understanding of their distinctive phenotypic and functional characteristics, including their responses to microenvironmental cues. Efforts to mimic the in-vivo vascular basement membrane milieu have led to the design and fabrication of nano- and micro-topographical substrates. Although the basement membrane architectures of arteries and veins are different, investigations into the effects of substrate topographies have so far focused on generic EC characteristics. Thus, topographical modulation of arterial- or venous-specific EC phenotype and function remains unknown. Here, we comprehensively evaluated the effects of 16 unique topographies on primary AECs, VECs and human PSC-ECs using a Multi Architectural (MARC) Chip. Gratings and micro-lenses augmented venous-specific phenotypes and depressed arterial functions in VECs; while AECs did not respond consistently to topography. PSC-ECs exhibited phenotypic and functional maturation towards an arterial subtype with increased angiogenic potential, NOTCH1 and Ac-LDL expression on gratings. Specific topographies could elicit different phenotypic and functional changes, despite similar morphological response in different ECs, demonstrating no direct correlation between the two responses.
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12
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Wang Z, Liu C, Xiao Y, Gu X, Xu Y, Dong N, Zhang S, Qin Q, Wang J. Remodeling of a Cell-Free Vascular Graft with Nanolamellar Intima into a Neovessel. ACS NANO 2019; 13:10576-10586. [PMID: 31483602 DOI: 10.1021/acsnano.9b04704] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Advances in cardiovascular materials have brought us improved artificial vessels with larger diameters for reducing adverse responses that drive acute thrombosis and the associated complications. Nonetheless, the challenge is still considerable when applying these materials in small-diameter blood vessels. Here we report the biomimetic design of an acellular small-diameter vascular graft with specifically lamellar nanotopography on the luminal surface via a modified freeze-cast technique. The experimental findings verify that the well-designed nanolamellar structure is able to inhibit the adherence and activation of platelets, induce oriented growth of endothelial cells, and eventually remodel a neovessel to maintain long-term patency in vivo. Furthermore, the results of numerical simulations in physically mimetic conditions reveal that the regularly lamellar nanopattern can manipulate blood flow to reduce the flow disturbance compared with random topography. Our current work not only creates a freeze-cast small-diameter vascular graft that employs topographic architecture to direct the vascular cell fates for revasculature but also rekindles confidence in biophysical cues for modulating in situ tissue regeneration.
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Affiliation(s)
| | - Chungeng Liu
- Department of Cardiovascular Surgery, Union Hospital , Tongji Medical College, Huazhong University of Science and Technology , Wuhan 430022 , China
| | - Yi Xiao
- College of Engineering and Computer Science , Australian National University , Canberra , Australian Capital Territory 2601 , Australia
| | | | | | - Nianguo Dong
- Department of Cardiovascular Surgery, Union Hospital , Tongji Medical College, Huazhong University of Science and Technology , Wuhan 430022 , China
| | | | - Qinghua Qin
- College of Engineering and Computer Science , Australian National University , Canberra , Australian Capital Territory 2601 , Australia
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13
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Weber C, Reinhardt S, Eghbalzadeh K, Wacker M, Guschlbauer M, Maul A, Sterner-Kock A, Wahlers T, Wippermann J, Scherner M. Patency and in vivo compatibility of bacterial nanocellulose grafts as small-diameter vascular substitute. J Vasc Surg 2018; 68:177S-187S.e1. [DOI: 10.1016/j.jvs.2017.09.038] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Accepted: 09/17/2017] [Indexed: 10/18/2022]
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14
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Pacharra S, Ortiz R, McMahon S, Wang W, Viebahn R, Salber J, Quintana I. Surface patterning of a novel PEG-functionalized poly-l-lactide polymer to improve its biocompatibility: Applications to bioresorbable vascular stents. J Biomed Mater Res B Appl Biomater 2018; 107:624-634. [PMID: 30091510 PMCID: PMC6585964 DOI: 10.1002/jbm.b.34155] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Revised: 04/03/2018] [Accepted: 04/22/2018] [Indexed: 12/21/2022]
Abstract
Today, research in the field of bioresorbable vascular stents (BVS) not only focusses on a new material being nontoxic but also tries to enhance its biocompatibility in terms of endothelialization potential and hemocompatibility. To this end, we used picosecond laser ablation technology as a single‐step and contactless method for surface microstructuring of a bioresorbable polymer which can be utilized in stent manufacture. The method works on all materials via fast material removal, can be easily adapted for micropatterning of tubular or more complex sample shapes and scaled up by means of micropatterning of metal molds for manufacturing. Here, picosecond laser ablation was applied to a bioresorbable, biologically inactive and polyethylene glycol‐modified poly‐l‐lactide polymer (PEGylated PLLA) to generate parallel microgrooves with varying geometries. The different patterns were thoroughly evaluated by a series of cyto‐ and hemocompatibility tests revealing that all surfaces were non‐toxic and non‐hemolytic. More importantly, patterns with 20 to 25 µm wide and 6 to 7 µm deep grooves significantly enhanced endothelial cell adhesion in comparison to samples with smaller grooves. Here, human cardiac microvascular endothelial cells were found to align along the groove direction, which is thought to encourage endothelialization of intraluminal surfaces of BVS. © 2018 The Authors Journal of Biomedical Materials Research Part B: Applied Biomaterials Published by Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 00B: 000–000, 2018. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 107B: 624–634, 2019.
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Affiliation(s)
- Sandra Pacharra
- Zentrum für klinische Forschung, Ruhr-Universität Bochum, Bochum, Germany.,Universitätsklinikum Knappschaftskrankenhaus, Chirurgische Klinik, Bochum, Germany
| | - Rocio Ortiz
- Ultraprecision Processes Unit, IK4-TEKNIKER Technological Research Center, Eibar, Gipuzkoa, Spain
| | - Sean McMahon
- Vornia Ltd, Laboratory A, Synergy Centre, Tallaght, Dublin, Ireland.,The Charles Institute of Dermatology, School of Medicine and Medical Science, University College, Dublin, Dublin, Ireland
| | - Wenxin Wang
- Vornia Ltd, Laboratory A, Synergy Centre, Tallaght, Dublin, Ireland.,The Charles Institute of Dermatology, School of Medicine and Medical Science, University College, Dublin, Dublin, Ireland
| | - Richard Viebahn
- Zentrum für klinische Forschung, Ruhr-Universität Bochum, Bochum, Germany.,Universitätsklinikum Knappschaftskrankenhaus, Chirurgische Klinik, Bochum, Germany
| | - Jochen Salber
- Zentrum für klinische Forschung, Ruhr-Universität Bochum, Bochum, Germany.,Universitätsklinikum Knappschaftskrankenhaus, Chirurgische Klinik, Bochum, Germany
| | - Iban Quintana
- Ultraprecision Processes Unit, IK4-TEKNIKER Technological Research Center, Eibar, Gipuzkoa, Spain
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15
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Giol ED, Van Vlierberghe S, Unger RE, Schaubroeck D, Ottevaere H, Thienpont H, Kirkpatrick CJ, Dubruel P. Endothelialization and Anticoagulation Potential of Surface-Modified PET Intended for Vascular Applications. Macromol Biosci 2018; 18:e1800125. [DOI: 10.1002/mabi.201800125] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 05/07/2018] [Indexed: 01/17/2023]
Affiliation(s)
- Elena Diana Giol
- Polymer Chemistry and Biomaterials Research (PBM) Group; Centre of Macromolecular Chemistry; Ghent University; Krijgslaan 281, S4-bis B-9000 Belgium
| | - Sandra Van Vlierberghe
- Polymer Chemistry and Biomaterials Research (PBM) Group; Centre of Macromolecular Chemistry; Ghent University; Krijgslaan 281, S4-bis B-9000 Belgium
- Brussels Photonics (B-PHOT); Vrije Universiteit Brussel; Pleinlaan 2 B-1050 Belgium
| | - Ronald E. Unger
- REPAIR LAB; University Medical Center of the Johannes Gutenberg University Mainz; Langenbeckstraat 1 55131 Germany
| | - David Schaubroeck
- Centre of Microsystems Technology (CMST); imec and Ghent University; Technologiepark-Zwijnaarde15 B-9052 Belgium
| | - Heidi Ottevaere
- Brussels Photonics (B-PHOT); Vrije Universiteit Brussel; Pleinlaan 2 B-1050 Belgium
| | - Hugo Thienpont
- Brussels Photonics (B-PHOT); Vrije Universiteit Brussel; Pleinlaan 2 B-1050 Belgium
| | - Charles James Kirkpatrick
- REPAIR LAB; University Medical Center of the Johannes Gutenberg University Mainz; Langenbeckstraat 1 55131 Germany
| | - Peter Dubruel
- Polymer Chemistry and Biomaterials Research (PBM) Group; Centre of Macromolecular Chemistry; Ghent University; Krijgslaan 281, S4-bis B-9000 Belgium
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16
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Kukumberg M, Yao Y, Goh SH, Neo DJ, Yao JY, Yim EK. Evaluation of the topographical influence on the cellular behavior of human umbilical vein endothelial cells. ADVANCED BIOSYSTEMS 2018; 2:1700217. [PMID: 30766915 PMCID: PMC6370334 DOI: 10.1002/adbi.201700217] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Indexed: 12/17/2022]
Abstract
Adhesion and proliferation of vascular endothelial cells are important parameters in the endothelialization of biomedical devices for vascular applications. Endothelialization is a complex process affected by endothelial cells and their interaction with the extracellular microenvironment. Although numerous approaches are taken to study the influence of the external environment, a systematic investigation of the impact of an engineered microenvironment on endothelial cell processes is needed. This study aims to investigate the influence of topography, initial cell seeding density, and collagen coating on human umbilical vein endothelial cells (HUVECs). Utilizing the MultiARChitecture (MARC) chamber, the effects of various topographies on HUVECs are identified, and those with more prominent effects were further evaluated individually using the MARC plate. Endothelial cell marker expression and monocyte adhesion assay are examined on the HUVEC monolayer. HUVECs on 1.8 μm convex and concave microlens topographies demonstrate the lowest cell adhesion and proliferation, regardless of initial cell seeding density and collagen I coating, and the HUVEC monolayer on the microlens shows the lowest monocyte adhesion. This property of lens topographies would potentially be a useful parameter in designing vascular biomedical devices. The MARC chamber and MARC plate show a great potential for faster and easy pattern identification for various cellular processes.
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Affiliation(s)
- Marek Kukumberg
- Mechanobiology Institute, National University of Singapore, #05-01 T-lab, 5A Engineering Drive 1, Singapore 117411
| | - Yuan Yao
- Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada
| | - Seok Hong Goh
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (ASTAR), 2 Fusionopolis Way, Innovis, 138634, Singapore, Department of Biomedical Engineering, National University of Singapore, E4, #04-10,4 Engineering Drive 3, Singapore 117583
| | - Dawn Jh Neo
- Mechanobiology Institute, National University of Singapore, #05-01 T-lab, 5A Engineering Drive 1, Singapore 117411
| | - Jia Yi Yao
- Department of Biomedical Engineering, National University of Singapore, E4, #04-10,4 Engineering Drive 3, Singapore 117583
| | - Evelyn Kf Yim
- Mechanobiology Institute, National University of Singapore, #05-01 T-lab, 5A Engineering Drive 1, Singapore 117411, Department of Biomedical Engineering, National University of Singapore, E4, #04-10,4 Engineering Drive 3, Singapore 117583, Department of Surgery, National University of Singapore, NUHS Tower Block, Level 8,1E Kent Ridge Road, Singapore 119228, Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada
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17
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Kant RJ, Coulombe KLK. Integrated approaches to spatiotemporally directing angiogenesis in host and engineered tissues. Acta Biomater 2018; 69:42-62. [PMID: 29371132 PMCID: PMC5831518 DOI: 10.1016/j.actbio.2018.01.017] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 12/15/2017] [Accepted: 01/15/2018] [Indexed: 12/14/2022]
Abstract
The field of tissue engineering has turned towards biomimicry to solve the problem of tissue oxygenation and nutrient/waste exchange through the development of vasculature. Induction of angiogenesis and subsequent development of a vascular bed in engineered tissues is actively being pursued through combinations of physical and chemical cues, notably through the presentation of topographies and growth factors. Presenting angiogenic signals in a spatiotemporal fashion is beginning to generate improved vascular networks, which will allow for the creation of large and dense engineered tissues. This review provides a brief background on the cells, mechanisms, and molecules driving vascular development (including angiogenesis), followed by how biomaterials and growth factors can be used to direct vessel formation and maturation. Techniques to accomplish spatiotemporal control of vascularization include incorporation or encapsulation of growth factors, topographical engineering, and 3D bioprinting. The vascularization of engineered tissues and their application in angiogenic therapy in vivo is reviewed herein with an emphasis on the most densely vascularized tissue of the human body - the heart. STATEMENT OF SIGNIFICANCE Vascularization is vital to wound healing and tissue regeneration, and development of hierarchical networks enables efficient nutrient transfer. In tissue engineering, vascularization is necessary to support physiologically dense engineered tissues, and thus the field seeks to induce vascular formation using biomaterials and chemical signals to provide appropriate, pro-angiogenic signals for cells. This review critically examines the materials and techniques used to generate scaffolds with spatiotemporal cues to direct vascularization in engineered and host tissues in vitro and in vivo. Assessment of the field's progress is intended to inspire vascular applications across all forms of tissue engineering with a specific focus on highlighting the nuances of cardiac tissue engineering for the greater regenerative medicine community.
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Affiliation(s)
- Rajeev J Kant
- Center for Biomedical Engineering, School of Engineering, Brown University, Providence, RI, USA
| | - Kareen L K Coulombe
- Center for Biomedical Engineering, School of Engineering, Brown University, Providence, RI, USA.
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18
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Whole-Transcriptome Sequencing: a Powerful Tool for Vascular Tissue Engineering and Endothelial Mechanobiology. High Throughput 2018; 7:ht7010005. [PMID: 29485616 PMCID: PMC5876531 DOI: 10.3390/ht7010005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Revised: 02/18/2018] [Accepted: 02/19/2018] [Indexed: 02/07/2023] Open
Abstract
Among applicable high-throughput techniques in cardiovascular biology, whole-transcriptome sequencing is of particular use. By utilizing RNA that is isolated from virtually all cells and tissues, the entire transcriptome can be evaluated. In comparison with other high-throughput approaches, RNA sequencing is characterized by a relatively low-cost and large data output, which permits a comprehensive analysis of spatiotemporal variation in the gene expression profile. Both shear stress and cyclic strain exert hemodynamic force upon the arterial endothelium and are considered to be crucial determinants of endothelial physiology. Laminar blood flow results in a high shear stress that promotes atheroresistant endothelial phenotype, while a turbulent, oscillatory flow yields a pathologically low shear stress that disturbs endothelial homeostasis, making respective arterial segments prone to atherosclerosis. Severe atherosclerosis significantly impairs blood supply to the organs and frequently requires bypass surgery or an arterial replacement surgery that requires tissue-engineered vascular grafts. To provide insight into patterns of gene expression in endothelial cells in native or bioartificial arteries under different biomechanical conditions, this article discusses applications of whole-transcriptome sequencing in endothelial mechanobiology and vascular tissue engineering.
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19
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Gong X, Yao J, He H, Zhao X, Liu X, Zhao F, Sun Y, Fan Y. Combination of flow and micropattern alignment affecting flow-resistant endothelial cell adhesion. J Mech Behav Biomed Mater 2017; 74:11-20. [DOI: 10.1016/j.jmbbm.2017.04.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 04/25/2017] [Accepted: 04/27/2017] [Indexed: 11/24/2022]
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20
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Taskin MB, Xia D, Besenbacher F, Dong M, Chen M. Nanotopography featured polycaprolactone/polyethyleneoxide microfibers modulate endothelial cell response. NANOSCALE 2017; 9:9218-9229. [PMID: 28654129 DOI: 10.1039/c7nr03326e] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Among many physical properties, surface nanotopography has been found to strongly affect cell adhesion, migration and other functions. Accurate biological interpretation requires the nanotopography to be presented in a three-dimensional (3D) micro-environment. Herein, immiscible blends of polycaprolactone (PCL)/polyethyleneoxide (PEO) were electrospun into a grounded coagulation bath, resulting in macroporous microfibers with nanotopography featured surfaces. Variations in PCL/PEO ratios enabled tunable surface nanotopographic structures, from longitudinal submicron grooves to transverse nano-lamellae. Chemical composition, crystallinity and quantitative nanomechanical analysis confirmed that the interplay of the two semi-crystalline immiscible polymers and the pairing of miscible solvents/non-solvents in both the electrospinning solution and the bath solution were critical for the formation of the secondary structure. It was found that the nanotopography features promoted the proliferation of human umbilical vein endothelial cells (HUVECs) compared with their smooth film counterparts. An analysis of the cell adhesion related markers, vinculin and phosphorylated focal adhesion kinase (pFAK), further revealed that the nanotopographies enhanced the nascent adhesion complex formation compared with smooth PCL fibers, even in the scaffolds with a high PEO content, which is often considered as a non-adhesive material.
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Affiliation(s)
- Mehmet Berat Taskin
- Interdisiplinary Nanoscience Center (iNANO), Aarhus University, DK-8000 Aarhus C, Denmark.
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21
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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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22
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Tan CH, Muhamad N, Abdullah MMAB. Surface Topographical Modification of Coronary Stent: A Review. ACTA ACUST UNITED AC 2017. [DOI: 10.1088/1757-899x/209/1/012031] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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23
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Wang F, Guan X, Wu T, Qiao J, Han Z, Wu J, Yu X, You Q. Acellular Endocardium as a Novel Biomaterial for the Intima of Tissue-Engineered Small-Caliber Vascular Grafts. Artif Organs 2016; 40:E253-E265. [DOI: 10.1111/aor.12814] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2015] [Revised: 05/09/2016] [Accepted: 07/06/2016] [Indexed: 12/14/2022]
Affiliation(s)
- Feng Wang
- Department of Cardiothoracic Surgery; Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; Shanghai
| | - Xin Guan
- Department of Cardiothoracic Surgery; Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; Shanghai
| | - TianYi Wu
- Department of Orthopaedics & Traumatology, Faculty of Medicine; Chinese University of Hong Kong, Prince of Wales Hospital; Hong Kong
| | - JianOu Qiao
- Department of Respiratory Medicine; Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine
| | - ZhaoQing Han
- Department of Respiratory Medicine; Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine
| | - JinLong Wu
- Department of Cardiothoracic Surgery; Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; Shanghai
| | - XiaoWei Yu
- Department of Orthopaedic Surgery; Shanghai Jiao Tong University Affiliated Sixth People's Hospital; Shanghai
| | - QingJun You
- Department of Thoracic and Cardiovascular Surgery; Affiliated Hospital of Jiangnan University; Wuxi China
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24
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Antonova LV, Seifalian AM, Kutikhin AG, Sevostyanova VV, Matveeva VG, Velikanova EA, Mironov AV, Shabaev AR, Glushkova TV, Senokosova EA, Vasyukov GY, Krivkina EO, Burago AY, Kudryavtseva YA, Barbarash OL, Barbarash LS. Conjugation with RGD Peptides and Incorporation of Vascular Endothelial Growth Factor Are Equally Efficient for Biofunctionalization of Tissue-Engineered Vascular Grafts. Int J Mol Sci 2016; 17:E1920. [PMID: 27854352 PMCID: PMC5133917 DOI: 10.3390/ijms17111920] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Revised: 10/21/2016] [Accepted: 10/31/2016] [Indexed: 01/13/2023] Open
Abstract
The blend of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and poly(ε-caprolactone) (PCL) has recently been considered promising for vascular tissue engineering. However, it was shown that PHBV/PCL grafts require biofunctionalization to achieve high primary patency rate. Here we compared immobilization of arginine-glycine-aspartic acid (RGD)-containing peptides and the incorporation of vascular endothelial growth factor (VEGF) as two widely established biofunctionalization approaches. Electrospun PHBV/PCL small-diameter grafts with either RGD peptides or VEGF, as well as unmodified grafts were implanted into rat abdominal aortas for 1, 3, 6, and 12 months following histological and immunofluorescence assessment. We detected CD31⁺/CD34⁺/vWF⁺ cells 1 and 3 months postimplantation at the luminal surface of PHBV/PCL/RGD and PHBV/PCL/VEGF, but not in unmodified grafts, with the further observation of CD31⁺CD34-vWF⁺ phenotype. These cells were considered as endothelial and produced a collagen-positive layer resembling a basement membrane. Detection of CD31⁺/CD34⁺ cells at the early stages with subsequent loss of CD34 indicated cell adhesion from the bloodstream. Therefore, either conjugation with RGD peptides or the incorporation of VEGF promoted the formation of a functional endothelial cell layer. Furthermore, both modifications increased primary patency rate three-fold. In conclusion, both of these biofunctionalization approaches can be considered as equally efficient for the modification of tissue-engineered vascular grafts.
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Affiliation(s)
- Larisa V Antonova
- Research Institute for Complex Issues of Cardiovascular Diseases, Sosnovy Boulevard 6, Kemerovo 650002, Russia.
| | - Alexander M Seifalian
- Centre for Nanotechnology and Regenerative Medicine, UCL Division of Surgery and Interventional Science, University College London, UCL Medical School Building, 21 University Street, London WC1E 6AU, UK.
- NanoRegMed Ltd., 20-22 Wenlock Road, London N1 7GU, UK.
| | - Anton G Kutikhin
- Research Institute for Complex Issues of Cardiovascular Diseases, Sosnovy Boulevard 6, Kemerovo 650002, Russia.
| | - Victoria V Sevostyanova
- Research Institute for Complex Issues of Cardiovascular Diseases, Sosnovy Boulevard 6, Kemerovo 650002, Russia.
| | - Vera G Matveeva
- Research Institute for Complex Issues of Cardiovascular Diseases, Sosnovy Boulevard 6, Kemerovo 650002, Russia.
| | - Elena A Velikanova
- Research Institute for Complex Issues of Cardiovascular Diseases, Sosnovy Boulevard 6, Kemerovo 650002, Russia.
| | - Andrey V Mironov
- Research Institute for Complex Issues of Cardiovascular Diseases, Sosnovy Boulevard 6, Kemerovo 650002, Russia.
| | - Amin R Shabaev
- Kemerovo Cardiology Dispensary, Sosnovy Boulevard 6, Kemerovo 650002, Russia.
| | - Tatiana V Glushkova
- Research Institute for Complex Issues of Cardiovascular Diseases, Sosnovy Boulevard 6, Kemerovo 650002, Russia.
| | - Evgeniya A Senokosova
- Research Institute for Complex Issues of Cardiovascular Diseases, Sosnovy Boulevard 6, Kemerovo 650002, Russia.
| | - Georgiy Yu Vasyukov
- Research Institute for Complex Issues of Cardiovascular Diseases, Sosnovy Boulevard 6, Kemerovo 650002, Russia.
| | - Evgeniya O Krivkina
- Research Institute for Complex Issues of Cardiovascular Diseases, Sosnovy Boulevard 6, Kemerovo 650002, Russia.
| | - Andrey Yu Burago
- Research Institute for Complex Issues of Cardiovascular Diseases, Sosnovy Boulevard 6, Kemerovo 650002, Russia.
| | - Yuliya A Kudryavtseva
- Research Institute for Complex Issues of Cardiovascular Diseases, Sosnovy Boulevard 6, Kemerovo 650002, Russia.
| | - Olga L Barbarash
- Research Institute for Complex Issues of Cardiovascular Diseases, Sosnovy Boulevard 6, Kemerovo 650002, Russia.
| | - Leonid S Barbarash
- Research Institute for Complex Issues of Cardiovascular Diseases, Sosnovy Boulevard 6, Kemerovo 650002, Russia.
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25
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Graft Modification Strategies to Improve Patency of Prosthetic Arteriovenous Grafts for Hemodialysis. J Vasc Access 2016; 17 Suppl 1:S85-90. [DOI: 10.5301/jva.5000526] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/30/2015] [Indexed: 11/20/2022] Open
Abstract
Prosthetic arteriovenous grafts (AVGs) are indicated for vascular access for long-term hemodialysis in patients in whom creation or maintenance of an arteriovenous fistula (AVF) has failed or is contraindicated. AVGs have an inferior long-term patency as compared to AVFs. To ameliorate patency rates of prosthetic AVGs, different strategies have emerged to improve graft materials. This review aims to describe current strategies and future perspectives on graft modification, by graft geometry, drug coatings and graft surface technology, to improve AVG patency.
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Parvizi M, Bolhuis-Versteeg LA, Poot AA, Harmsen MC. Efficient generation of smooth muscle cells from adipose-derived stromal cells by 3D mechanical stimulation can substitute the use of growth factors in vascular tissue engineering. Biotechnol J 2016; 11:932-44. [DOI: 10.1002/biot.201500519] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Revised: 12/24/2015] [Accepted: 03/09/2016] [Indexed: 12/15/2022]
Affiliation(s)
- Mojtaba Parvizi
- University of Groningen; University Medical Center Groningen, Department of Pathology and Medical Biology; Groningen the Netherlands
| | | | - André A. Poot
- Biomaterials Science and Technology; University of Twente; Enschede the Netherlands
| | - Martin C. Harmsen
- University of Groningen; University Medical Center Groningen, Department of Pathology and Medical Biology; Groningen the Netherlands
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27
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Cutiongco MFA, Goh SH, Aid-Launais R, Le Visage C, Low HY, Yim EKF. Planar and tubular patterning of micro and nano-topographies on poly(vinyl alcohol) hydrogel for improved endothelial cell responses. Biomaterials 2016; 84:184-195. [PMID: 26828683 DOI: 10.1016/j.biomaterials.2016.01.036] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Revised: 01/12/2016] [Accepted: 01/15/2016] [Indexed: 11/28/2022]
Abstract
Poly(vinyl alcohol) hydrogel (PVA) is a widely used material for biomedical devices, yet there is a need to enhance its biological functionality for in vitro and in vivo vascular application. Significance of surface topography in modulating cellular behaviour is increasingly evident. However, hydrogel patterning remains challenging. Using a casting method, planar PVA were patterned with micro-sized features. To achieve higher patterning resolution, nanoimprint lithography with high pressure and temperature was used. In vitro experiment showed enhanced human endothelial cell (EC) density and adhesion on patterned PVA. Additional chemical modification via nitrogen gas plasma on patterned PVA further improved EC density and adhesion. Only EC monolayer grown on plasma modified PVA with 2 μm gratings and 1.8 μm concave lens exhibited expression of vascular endothelial cadherin, indicating EC functionality. Patterning of the luminal surface of tubular hydrogels is not widely explored. The study presents the first method for simultaneous tubular molding and luminal surface patterning of hydrogel. PVA graft with 2 μm gratings showed patency and endothelialization, while unpatterned grafts were occluded after 20 days in rat aorta. The reproducible, high yield and high-fidelity methods enable planar and tubular patterning of PVA and other hydrogels to be used for biomedical applications.
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Affiliation(s)
- Marie F A Cutiongco
- Department of Biomedical Engineering, National University of Singapore, Singapore; Mechanobiology Institute, National University of Singapore, Singapore
| | - Seok Hong Goh
- Department of Biomedical Engineering, National University of Singapore, Singapore; Institute of Materials Research and Engineering, Agency for Science, Technology and Research, Singapore
| | | | - Catherine Le Visage
- INSERM, U1148, Laboratory for Vascular Translational Science, Paris, France; INSERM, U791, Center for OstesArticular and Dental Tissue Engineering, Nantes, France
| | - Hong Yee Low
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research, Singapore; Engineering Product Development Cluster, Singapore University of Technology and Design, Singapore.
| | - Evelyn K F Yim
- Department of Biomedical Engineering, National University of Singapore, Singapore; Mechanobiology Institute, National University of Singapore, Singapore; Department of Surgery, National University of Singapore, Singapore; Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada.
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28
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Early in-situ cellularization of a supramolecular vascular graft is modified by synthetic stromal cell-derived factor-1α derived peptides. Biomaterials 2016; 76:187-95. [DOI: 10.1016/j.biomaterials.2015.10.052] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Revised: 10/13/2015] [Accepted: 10/18/2015] [Indexed: 02/08/2023]
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Xu LC, Siedlecki CA. Protein adsorption, platelet adhesion, and bacterial adhesion to polyethylene-glycol-textured polyurethane biomaterial surfaces. J Biomed Mater Res B Appl Biomater 2015; 105:668-678. [PMID: 26669615 DOI: 10.1002/jbm.b.33592] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Revised: 11/17/2015] [Accepted: 11/18/2015] [Indexed: 11/06/2022]
Abstract
Traditional strategies for surface modification to enhance the biocompatibility of biomaterials often focus on a single route utilizing either chemical or physical approaches. This study combines the chemical and physical treatments as applied to poly(urethane urea) (PUU) biomaterials to enhance biocompatibility at the interface for inhibiting platelet-related thrombosis or bacterial adhesion-induced microbial infections. PUU films were first textured with submicron patterns by a soft lithography two-stage replication process, and then were grafted with polyethylene glycol (PEG). A series of biological response experiments including protein adsorption, platelet adhesion/activation, and bacterial adhesion/biofilm formation showed that PEG-grafted submicron textured biomaterial surfaces were resistant to protein adsorption, and greatly increased the efficiency in reducing both platelet adhesion/activation and bacterial adhesion/biofilm formation due to the additive effects of physical topography and grafted PEG. Results suggest that a combination of chemical modification and surface texturing will be more efficient in preventing biomaterial-associated thrombosis and infection of biomaterials. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 668-678, 2017.
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Affiliation(s)
- Li-Chong Xu
- Department of Surgery, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, Pennsylvania, 17033
| | - Christopher A Siedlecki
- Department of Surgery, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, Pennsylvania, 17033.,Department of Bioengineering, Biomedical Engineering Institute, The Pennsylvania State University, College of Medicine, Hershey, Pennsylvania, 17033
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30
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Pang JH, Farhatnia Y, Godarzi F, Tan A, Rajadas J, Cousins BG, Seifalian AM. In situ Endothelialization: Bioengineering Considerations to Translation. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:6248-64. [PMID: 26460851 DOI: 10.1002/smll.201402579] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Revised: 06/14/2015] [Indexed: 05/10/2023]
Abstract
Improving patency rates of current cardiovascular implants remains a major challenge. It is widely accepted that regeneration of a healthy endothelium layer on biomaterials could yield the perfect blood-contacting surface. Earlier efforts in pre-seeding endothelial cells in vitro demonstrated success in enhancing patency, but translation to the clinic is largely hampered due to its impracticality. In situ endothelialization, which aims to create biomaterial surfaces capable of self-endothelializing upon implantation, appears to be an extremely promising solution, particularly with the utilization of endothelial progenitor cells (EPCs). Nevertheless, controlling cell behavior in situ using immobilized biomolecules or physical patterning can be complex, thus warranting careful consideration. This review aims to provide valuable insight into the rationale and recent developments in biomaterial strategies to enhance in situ endothelialization. In particular, a discussion on the important bio-/nanoengineering considerations and lessons learnt from clinical trials are presented to aid the future translation of this exciting paradigm.
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Affiliation(s)
- Jun Hon Pang
- Centre for Nanotechnology & Regenerative Medicine, Division of Surgery & Interventional Science, University College London (UCL), London, UK
| | - Yasmin Farhatnia
- Centre for Nanotechnology & Regenerative Medicine, Division of Surgery & Interventional Science, University College London (UCL), London, UK
| | - Fatemeh Godarzi
- Centre for Nanotechnology & Regenerative Medicine, Division of Surgery & Interventional Science, University College London (UCL), London, UK
| | - Aaron Tan
- Centre for Nanotechnology & Regenerative Medicine, Division of Surgery & Interventional Science, University College London (UCL), London, UK
- UCL Medical School, University College London (UCL), London, UK
- Biomaterials & Advanced Drug Delivery Laboratory, Stanford School of Medicine, Stanford University, Stanford, California, USA
| | - Jayakumar Rajadas
- Biomaterials & Advanced Drug Delivery Laboratory, Stanford School of Medicine, Stanford University, Stanford, California, USA
| | - Brian G Cousins
- Centre for Nanotechnology & Regenerative Medicine, Division of Surgery & Interventional Science, University College London (UCL), London, UK
| | - Alexander M Seifalian
- Centre for Nanotechnology & Regenerative Medicine, Division of Surgery & Interventional Science, University College London (UCL), London, UK
- Royal Free Hospital, London, UK
- NanoRegMed Ltd, London, UK
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31
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Chong DST, Turner LA, Gadegaard N, Seifalian AM, Dalby MJ, Hamilton G. Nanotopography and plasma treatment: redesigning the surface for vascular graft endothelialisation. Eur J Vasc Endovasc Surg 2015; 49:335-43. [PMID: 25579872 DOI: 10.1016/j.ejvs.2014.12.008] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Accepted: 12/05/2014] [Indexed: 11/18/2022]
Abstract
INTRODUCTION Vascular graft materials in clinical use, such as polytetrafluoroethylene (PTFE) and Dacron, do not endothelialise and have low patency rates. The importance of an endothelial cell layer on the luminal surface of a vascular graft is well-known with surface topography and chemistry playing an important role. The aim of this study was to investigate the potential of plasma treatment and topographical structures on the luminal graft surface to enhance the self-endothelialisation potential of a nanocomposite vascular graft. METHODS POSS-PCU is a polycarbonate urea urethane (PCU) with a nanoparticle, polyhedral oligomeric silsesquioxane (POSS) incorporated within it. Planar, microgrooved, and nanopit patterned polymer films were fabricated using photolithography, electron beam lithography, reactive ion etching, and replication by solvent casting. Films were then exposed to oxygen plasma treatment at different powers for a fixed time (40 W, 60 W, 80 W/60 seconds). Effects of plasma treatment were assessed using scanning electron microscopy, atomic force microscopy and water contact angle analysis. Human umbilical vein endothelial cell (HUVEC) proliferation and morphology were characterised using immunostaining, live/dead staining, and Coomassie blue staining. RESULTS Successful embossing of the micro- and nanostructures was confirmed. Oxygen plasma treatment of the different samples showed that increasing power significantly increased the hydrophilicity of the samples (p < .0001). Improved HUVEC adhesion was seen on plasma modified compared with untreated samples (p < .0001). Coomassie blue staining showed that after 5 days, cells started to form monolayers and live/dead staining showed the cells were viable. Immunostaining showed that HUVECs expressed nitric oxide synthase on all topographies with focal adhesions appearing more pronounced on nanopit surfaces, showing retention of morphology and function. CONCLUSION These encouraging results indicate a future important role for plasma treatment and nanotopography in the development of endothelialised vascular grafts.
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Affiliation(s)
- D S T Chong
- Department of Vascular Surgery, Royal Free London NHS Foundation Trust, UK; Division of Surgery and Interventional Science, UCL, UK
| | - L A Turner
- Centre for Cell Engineering, University of Glasgow, UK
| | - N Gadegaard
- Division of Biomedical Engineering, University of Glasgow, UK
| | - A M Seifalian
- Division of Surgery and Interventional Science, UCL, UK
| | - M J Dalby
- Centre for Cell Engineering, University of Glasgow, UK
| | - G Hamilton
- Department of Vascular Surgery, Royal Free London NHS Foundation Trust, UK; Division of Surgery and Interventional Science, UCL, UK.
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32
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Goh ET, Wong E, Farhatnia Y, Tan A, Seifalian AM. Accelerating in situ endothelialisation of cardiovascular bypass grafts. Int J Mol Sci 2014; 16:597-627. [PMID: 25551605 PMCID: PMC4307264 DOI: 10.3390/ijms16010597] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2014] [Accepted: 12/19/2014] [Indexed: 12/18/2022] Open
Abstract
The patency of synthetic cardiovascular grafts in the long run is synonymous with their ability to inhibit the processes of intimal hyperplasia, thrombosis and calcification. In the human body, the endothelium of blood vessels exhibits characteristics that inhibit such processes. As such it is not surprising that research in tissue engineering is directed towards replicating the functionality of the natural endothelium in cardiovascular grafts. This can be done either by seeding the endothelium within the lumen of the grafts prior to implantation or by designing the graft such that in situ endothelialisation takes place after implantation. Due to certain difficulties identified with in vitro endothelialisation, in situ endothelialisation, which will be the focus of this article, has garnered interest in the last years. To promote in situ endothelialisation, the following aspects can be taken into account: (1) Endothelial progenital cell mobilization, adhesion and proliferation; (2) Regulating differentiation of progenitor cells to mature endothelium; (3) Preventing thrombogenesis and inflammation during endothelialisation. This article aims to review and compile recent developments to promote the in situ endothelialisation of cardiovascular grafts and subsequently improve their patency, which can also have widespread implications in the field of tissue engineering.
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Affiliation(s)
- Ee Teng Goh
- Centre for Nanotechnology & Regenerative Medicine, Research Department of Nanotechnology, UCL Division of Surgery & Interventional Science, University College London (UCL), London NW3 2QG, UK.
| | - Eleanor Wong
- Centre for Nanotechnology & Regenerative Medicine, Research Department of Nanotechnology, UCL Division of Surgery & Interventional Science, University College London (UCL), London NW3 2QG, UK.
| | - Yasmin Farhatnia
- Centre for Nanotechnology & Regenerative Medicine, Research Department of Nanotechnology, UCL Division of Surgery & Interventional Science, University College London (UCL), London NW3 2QG, UK.
| | - Aaron Tan
- Centre for Nanotechnology & Regenerative Medicine, Research Department of Nanotechnology, UCL Division of Surgery & Interventional Science, University College London (UCL), London NW3 2QG, UK.
| | - Alexander M Seifalian
- Centre for Nanotechnology & Regenerative Medicine, Research Department of Nanotechnology, UCL Division of Surgery & Interventional Science, University College London (UCL), London NW3 2QG, UK.
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