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Hu Y, Li L, Li Q, Pan S, Feng G, Lan X, Jiao J, Zhong L, Sun L. A biomimetic tri-phasic scaffold with spatiotemporal patterns of gastrodin to regulate hierarchical tissue-based vascular regeneration. Bioact Mater 2024; 38:512-527. [PMID: 38798891 PMCID: PMC11126808 DOI: 10.1016/j.bioactmat.2024.05.007] [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: 01/27/2024] [Revised: 04/17/2024] [Accepted: 05/03/2024] [Indexed: 05/29/2024] Open
Abstract
Clinical use of small-diameter vascular grafts remains a challenging issue in neovessel regeneration in view of thrombosis and intimal hyperplasia. Developing a vascular graft with structure and function similar to those of the native vessels necessitates a major direction of vascular tissue regeneration. Thus, this study sought to design and fabricate a range of tri-phasic scaffolds (0, 2, and 5 wt% gastrodin-polyurethane (PU)) with spatiotemporally defined structure and gastrodin-release for regulating the highly coordinated processes in growth of the intima and media. While the small pores of inner layer guided infiltration of human umbilical vein endothelial cells (HUVECs), the bigger pores of medial layer could offer smooth muscle cell (SMC)-friendly habitat, and external fibers conferred adequate mechanical properties. Correspondingly, spatial distribution and differential regulation of key proteins in HUVECs and SMCs were mediated by hierarchical release of gastrodin, of which rapid release in inner layer elicited enhanced HUVEC proliferation and migration against those of the SMC via activated endothelial nitric oxide synthase (eNOS) and heat shock protein 70 (HSP70) signal. Of note, superior anti-coagulation was reflected in 2 wt% gastrodin-PU ex vivo extracorporeal blood circulation experiment. After in vivo implantation for 12 weeks, there was no formation of obvious thrombosis and intimal hyperplasia in 2 wt% gastrodin-PU. The scaffold maintained high patency and improved vascular remodeling, including the formation of thin endothelialization in lumen and dense extracellular matrix deposition in medial layer. Taken together, the results demonstrate the positive function of hierarchical releasing system that responded to tri-phasic structure, which not only suppressed intimal thickening but also tightly controlled tissue regeneration.
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Affiliation(s)
- Yingrui Hu
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Department of Cardiology, The Second Affiliated Hospital, Kunming Medical University, Kunming, 650101, China
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Kunming Medical University, Kunming, 650500, China
| | - Limei Li
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Kunming Medical University, Kunming, 650500, China
| | - Qing Li
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Kunming Medical University, Kunming, 650500, China
| | - Shilin Pan
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Kunming Medical University, Kunming, 650500, China
| | - Guangli Feng
- Department of Neurology, The First Affiliated Hospital, Kunming Medical University, Kunming, 650032, China
| | - Xiaoqian Lan
- Department of Neurology, The First Affiliated Hospital, Kunming Medical University, Kunming, 650032, China
| | - Jianlin Jiao
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Kunming Medical University, Kunming, 650500, China
| | - Lianmei Zhong
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, 100053, China
| | - Lin Sun
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Department of Cardiology, The Second Affiliated Hospital, Kunming Medical University, Kunming, 650101, China
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2
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Donmazov S, Piskin S, Gölcez T, Kul D, Arnaz A, Pekkan K. Mechanical characterization and torsional buckling of pediatric cardiovascular materials. Biomech Model Mechanobiol 2024; 23:845-860. [PMID: 38361084 PMCID: PMC11101351 DOI: 10.1007/s10237-023-01809-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Accepted: 12/22/2023] [Indexed: 02/17/2024]
Abstract
In complex cardiovascular surgical reconstructions, conduit materials that avoid possible large-scale structural deformations should be considered. A fundamental mode of mechanical complication is torsional buckling which occurs at the anastomosis site due to the mechanical instability, leading surgical conduit/patch surface deformation. The objective of this study is to investigate the torsional buckling behavior of commonly used materials and to develop a practical method for estimating the critical buckling rotation angle under physiological intramural vessel pressures. For this task, mechanical tests of four clinically approved materials, expanded polytetrafluoroethylene (ePTFE), Dacron, porcine and bovine pericardia, commonly used in pediatric cardiovascular surgeries, are conducted (n = 6). Torsional buckling initiation tests with n = 4 for the baseline case (L = 7.5 cm) and n = 3 for the validation of ePTFE (L = 15 cm) and Dacron (L = 15 cm and L = 25 cm) for each are also conducted at low venous pressures. A practical predictive formulation for the buckling potential is proposed using experimental observations and available theory. The relationship between the critical buckling rotation angle and the lumen pressure is determined by balancing the circumferential component of the compressive principal stress with the shear stress generated by the modified critical buckling torque, where the modified critical buckling torque depends linearly on the lumen pressure. While the proposed technique successfully predicted the critical rotation angle values lying within two standard deviations of the mean in the baseline case for all four materials at all lumen pressures, it could reliably predict the critical buckling rotation angles for ePTFE and Dacron samples of length 15 cm with maximum relative errors of 31% and 38%, respectively, in the validation phase. However, the validation of the performance of the technique demonstrated lower accuracy for Dacron samples of length 25 cm at higher pressure levels of 12 mmHg and 15 mmHg. Applicable to all surgical materials, this formulation enables surgeons to assess the torsional buckling potential of vascular conduits noninvasively. Bovine pericardium has been found to exhibit the highest stability, while Dacron (the lowest) and porcine pericardium have been identified as the least stable with the (unitless) torsional buckling resistance constants, 43,800, 12,300 and 14,000, respectively. There was no significant difference between ePTFE and Dacron, and between porcine and bovine pericardia. However, both porcine and bovine pericardia were found to be statistically different from ePTFE and Dacron individually (p < 0.0001). ePTFE exhibited highly nonlinear behavior across the entire strain range [0, 0.1] (or 10% elongation). The significant differences among the surgical materials reported here require special care in conduit construction and anastomosis design.
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Affiliation(s)
- Samir Donmazov
- Department of Mathematics, University of Kentucky, Kentucky, 40506, USA
| | - Senol Piskin
- Department of Mechanical Engineering, Istinye University, Istanbul, 34010, Turkey
| | - Tansu Gölcez
- Department of Bio-Medical Science and Engineering, Koc University, Istanbul, Turkey
| | - Demet Kul
- Department of Cellular and Molecular Medicine, Koc University, Istanbul, Turkey
| | - Ahmet Arnaz
- Department of Cardiovascular Surgery, School of Medicine, Acibadem Mehmet Ali Aydinlar University, Istanbul, Turkey
| | - Kerem Pekkan
- Department of Mechanical Engineering, Koc University, Sariyer, Istanbul, Turkey.
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Ozdemir S, Oztemur J, Sezgin H, Yalcin-Enis I. Optimization of Electrospun Bilayer Vascular Grafts through Assessment of the Mechanical Properties of Monolayers. ACS Biomater Sci Eng 2024; 10:960-974. [PMID: 38196384 DOI: 10.1021/acsbiomaterials.3c01161] [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] [Indexed: 01/11/2024]
Abstract
Small-diameter vascular grafts must be obtained with the most appropriate materials and design selection to harmoniously display a variety of features, including adequate tensile strength, compliance, burst strength, biocompatibility, and biodegradability against challenging physiological and hemodynamic conditions. In this study, monolayer vascular grafts with randomly distributed or radially oriented fibers are produced using neat, blended, and copolymer forms of polycaprolactone (PCL) and poly(lactic acid) (PLA) via the electrospinning technique. The blending ratio is varied by increasing 10 in the range of 50-100%. Bilayer graft designs are realized by determining the layers with a random fiber distribution for the inner layer and radial fiber orientation for the outer layer. SEM analysis, wall thickness and fiber diameter measurements, tensile strength, elongation, burst strength, and compliance tests are done for both mono- and bilayer scaffolds. The findings revealed that the scaffolds made of neat PCL show more flexibility than the neat PLA samples, which possess higher tensile strength values than neat PCL scaffolds. Also, in blended samples, the tensile strength values do not show a significant improvement, whereas the elongation values are enhanced in tubular samples, depending on the blending ratio. Also, neat poly(l-lactide-co-caprolactone) (PLCL) samples have both higher elongation and strength values than neat and blended scaffolds, with some exceptions. The blended specimens comprising a combination of PCL and PLA, with blending ratios of 80/20 and 70/30, exhibited the most elevated burst pressures. Conversely, the PLCL scaffolds demonstrated superior compliance levels. These findings suggest that the blending approach and fiber orientation offer enhanced burst strength, while copolymer utilization in PLCL scaffolds without fiber alignment enhances their compliance properties. Thus, it is evident that using a copolymer instead of blending PCL and PLA and combining the PLCL layer with PCL and PLA monolayers in bilayer vascular graft design is promising in terms of mechanical and biological properties.
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Affiliation(s)
- Suzan Ozdemir
- Textile Engineering Department, Istanbul Technical University, Istanbul 34437, Turkey
| | - Janset Oztemur
- Textile Engineering Department, Istanbul Technical University, Istanbul 34437, Turkey
| | - Hande Sezgin
- Textile Engineering Department, Istanbul Technical University, Istanbul 34437, Turkey
| | - Ipek Yalcin-Enis
- Textile Engineering Department, Istanbul Technical University, Istanbul 34437, Turkey
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4
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Beachley V, Kuo J, Kasyanov V, Mironov V, Wen X. Biomimetic crimped/aligned microstructure to optimize the mechanics of fibrous hybrid materials for compliant vascular grafts. J Mech Behav Biomed Mater 2024; 150:106301. [PMID: 38141364 DOI: 10.1016/j.jmbbm.2023.106301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 10/28/2023] [Accepted: 12/02/2023] [Indexed: 12/25/2023]
Abstract
The precise mechanical properties of many tissues are highly dependent on both the composition and arrangement of the nanofibrous extracellular matrix. It is well established that collagen nanofibers exhibit a crimped microstructure in several tissues such as blood vessel, tendon, and heart valve. This collagen fiber arrangement results in the classic non-linear 'J-shaped' stress strain curve characteristic of these tissues. Synthetic biomimetic fibrous materials with a crimped microstructure similar to natural collagen demonstrate similar mechanical properties to natural tissues. The following work describes a nanofabrication method based on electrospinning used to fabricate two component hybrid electrospun fibrous materials that mimic the microstructure and mechanical properties of vascular tissue. The properties of these samples can be precisely and predictably optimized by modifying fabrication parameters. Tubular grafts with biomimetic microstructure were constructed to demonstrate the potential of this fabrication method in vascular graft replacement applications. It was possible to closely match both the overall geometry and the compliance of specific blood vessels by optimizing graft microstructure.
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Affiliation(s)
- Vince Beachley
- Department of Biomedical Engineering, Rowan University, Glassboro, NJ, 08028, USA.
| | - Jonathan Kuo
- Department of Bioengineering, Clemson University, Clemson, SC, USA
| | | | - Vladimir Mironov
- Center for Biomedical Engineering, National University of Science and Technology (MISIS), Moscow, Russia
| | - Xuejun Wen
- Institute for Engineering and Medicine, Virgina Commonwealth University, Richmond, VA, USA
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Nakhaei M, Jirofti N, Moradi A, Daliri M, Ebrahimzadeh MH. Fabrication of an Artificial Pulley Based on Electrospun Composite Polyurethane/Polycaprolactone Nanofibers for Hand Surgery: Structural, Mechanical, In Vitro, and In Vivo Examinations. ACS Biomater Sci Eng 2023; 9:5589-5598. [PMID: 37609710 DOI: 10.1021/acsbiomaterials.3c00431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/24/2023]
Abstract
Injuries to the hand's flexor pulley system can be debilitating, causing pain and restricting movement of the affected finger(s). The creation of a biocompatible artificial pulley could potentially alleviate some of the complications associated with current surgical treatments. In this study, a biocompatible artificial pulley was fabricated by using polycaprolactone (PCL) and polyurethane (PU) in the form of an electrospun nanofiber structure. All scaffolds were structurally analyzed using FESEM imaging, porosity, FTIR, and DSC examinations. Mechanical properties were evaluated, and in vitro studies were conducted on the degradation rate, swelling ratio, and toxicity. Immune response to fabricated scaffolds was evaluated by implanting them under the skin of rats for further pathological examination. All scaffolds exhibited a nanoscale structure and high porosity without any undesirable functional groups. The 25% PCL scaffold showed 17%, 20%, 80%, 17%, and 70% significant increases in Fmax, final stress, final strain, Young's modulus, and elongation percentage, respectively. In fact, the PCL25% scaffold demonstrated more than 100% improvement in mechanical properties compared to those of A2 and A4 natural pulleys. Additionally, all scaffold structures showed cell viability similar to that of the control sample. The study suggests that scaffolds made of 25% PCL hold promise as effective artificial pulleys for reconstructing the flexor tendon pulley system in cases of injury.
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Affiliation(s)
- Mehrnoush Nakhaei
- Orthopedic Research Center, Department of Orthopedic Surgery, Mashhad University of Medical Science, Mashhad 91388-13944, Iran
- Bone and Joint Research laboratory, Ghaem Hospital, Mashhad University of Medical Science, Mashhad 91388-13944, Iran
| | - Nafiseh Jirofti
- Orthopedic Research Center, Department of Orthopedic Surgery, Mashhad University of Medical Science, Mashhad 91388-13944, Iran
- Bone and Joint Research laboratory, Ghaem Hospital, Mashhad University of Medical Science, Mashhad 91388-13944, Iran
| | - Ali Moradi
- Orthopedic Research Center, Department of Orthopedic Surgery, Mashhad University of Medical Science, Mashhad 91388-13944, Iran
- Bone and Joint Research laboratory, Ghaem Hospital, Mashhad University of Medical Science, Mashhad 91388-13944, Iran
| | - Mahla Daliri
- Orthopedic Research Center, Department of Orthopedic Surgery, Mashhad University of Medical Science, Mashhad 91388-13944, Iran
| | - Mohammad Hossein Ebrahimzadeh
- Orthopedic Research Center, Department of Orthopedic Surgery, Mashhad University of Medical Science, Mashhad 91388-13944, Iran
- Bone and Joint Research laboratory, Ghaem Hospital, Mashhad University of Medical Science, Mashhad 91388-13944, Iran
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6
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Rosalia M, Grisoli P, Dorati R, Chiesa E, Pisani S, Bruni G, Genta I, Conti B. Influence of Electrospun Fibre Secondary Morphology on Antibiotic Release Kinetic and Its Impact on Antimicrobic Efficacy. Int J Mol Sci 2023; 24:12108. [PMID: 37569489 PMCID: PMC10418872 DOI: 10.3390/ijms241512108] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 07/19/2023] [Accepted: 07/25/2023] [Indexed: 08/13/2023] Open
Abstract
Vascular graft infections are a severe complication in vascular surgery, with a high morbidity and mortality. Prevention and treatment involve the use of antibiotic- or antiseptic-impregnated artificial vascular grafts, but currently, there are no commercially available infection-proof small-diameter vascular grafts (SDVGs). In this work we investigated the antimicrobic activity of two SDVGs prototypes loaded with tobramycin and produced via the electrospinning of drug-doped PLGA (polylactide-co-glycolide) solutions. Differences in rheological and conductivity properties of the polymer solutions resulted in non-identical fibre morphology that deeply influenced the hydration profile and consequently the in vitro cumulative drug release, which was investigated by using a spectrofluorimetric technique. Using DDSolver Excel add-in, modelling of the drug release kinetic was performed to evaluate the release mechanism involved: Prototype 1 showed a sustained and diffusive driven drug release, which allowed for the complete elution of tobramycin within 2 weeks, whereas Prototype 2 resulted in a more extended drug release controlled by both diffusion and matrix relaxation. Time-kill assays performed on S. aureus and E. coli highlighted the influence of burst drug release on the decay rate of bacterial populations, with Prototype 1 being more efficient on both microorganisms. Nevertheless, both prototypes showed good antimicrobic activity over the 5 days of in vitro testing.
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Affiliation(s)
- Mariella Rosalia
- Department of Drug Sciences, Pharmaceutical Section, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy; (M.R.); (R.D.); (E.C.); (S.P.); (I.G.)
| | - Pietro Grisoli
- Department of Drug Sciences, Pharmacological Section, University of Pavia, Via Taramelli 16, 27100 Pavia, Italy
| | - Rossella Dorati
- Department of Drug Sciences, Pharmaceutical Section, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy; (M.R.); (R.D.); (E.C.); (S.P.); (I.G.)
| | - Enrica Chiesa
- Department of Drug Sciences, Pharmaceutical Section, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy; (M.R.); (R.D.); (E.C.); (S.P.); (I.G.)
| | - Silvia Pisani
- Department of Drug Sciences, Pharmaceutical Section, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy; (M.R.); (R.D.); (E.C.); (S.P.); (I.G.)
| | - Giovanna Bruni
- Consorzio per lo Sviluppo dei Sistemi a Grande Interfase (C.S.G.I.), Department of Chemistry, Physical Chemistry Section, University of Pavia, Via Taramelli 10, 27100 Pavia, Italy;
| | - Ida Genta
- Department of Drug Sciences, Pharmaceutical Section, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy; (M.R.); (R.D.); (E.C.); (S.P.); (I.G.)
| | - Bice Conti
- Department of Drug Sciences, Pharmaceutical Section, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy; (M.R.); (R.D.); (E.C.); (S.P.); (I.G.)
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7
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Yao Y, Pohan G, Cutiongco MFA, Jeong Y, Kunihiro J, Zaw AM, David D, Shangguan H, Yu ACH, Yim EKF. In vivo evaluation of compliance mismatch on intimal hyperplasia formation in small diameter vascular grafts. Biomater Sci 2023; 11:3297-3307. [PMID: 36943136 PMCID: PMC10160004 DOI: 10.1039/d3bm00167a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
Abstract
Small diameter synthetic vascular grafts have high failure rate due to the thrombosis and intimal hyperplasia formation. Compliance mismatch between the synthetic graft and native artery has been speculated to be one of the main causes of intimal hyperplasia. However, changing the compliance of synthetic materials without altering material chemistry remains a challenge. Here, we used poly(vinyl alcohol) (PVA) hydrogel as a graft material due to its biocompatibility and tunable mechanical properties to investigate the role of graft compliance in the development of intimal hyperplasia and in vivo patency. Two groups of PVA small diameter grafts with low compliance and high compliance were fabricated by dip casting method and implanted in a rabbit carotid artery end-to-side anastomosis model for 4 weeks. We demonstrated that the grafts with compliance that more closely matched with rabbit carotid artery had lower anastomotic intimal hyperplasia formation and higher graft patency compared to low compliance grafts. Overall, this study suggested that reducing the compliance mismatch between the native artery and vascular grafts is beneficial for reducing intimal hyperplasia formation.
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Affiliation(s)
- Yuan Yao
- Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1.
| | - Grace Pohan
- Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1.
| | - Marie F A Cutiongco
- Mechanobiology Institute, National University of Singapore, 9 Engineering Drive 1, Singapore 117575
- Division of Cell Matrix Biology and Regenerative Medicine, The University of Manchester, Oxford Road, Manchester, UK M13 9PL
| | - YeJin Jeong
- Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1.
| | - Joshua Kunihiro
- Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1.
| | - Aung Moe Zaw
- Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1.
| | - Dency David
- Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1.
| | - Hanyue Shangguan
- Schlegel Research Institute for Aging, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1
- Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1
- Center for Biotechnology and Bioengineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1
| | - Alfred C H Yu
- Schlegel Research Institute for Aging, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1
- Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1
- Center for Biotechnology and Bioengineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1
| | - Evelyn K F Yim
- Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1.
- Mechanobiology Institute, National University of Singapore, 9 Engineering Drive 1, Singapore 117575
- Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1
- Center for Biotechnology and Bioengineering, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1
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Langwald SV, Ehrmann A, Sabantina L. Measuring Physical Properties of Electrospun Nanofiber Mats for Different Biomedical Applications. MEMBRANES 2023; 13:488. [PMID: 37233549 PMCID: PMC10220787 DOI: 10.3390/membranes13050488] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 04/26/2023] [Accepted: 04/27/2023] [Indexed: 05/27/2023]
Abstract
Electrospun nanofiber mats are nowadays often used for biotechnological and biomedical applications, such as wound healing or tissue engineering. While most studies concentrate on their chemical and biochemical properties, the physical properties are often measured without long explanations regarding the chosen methods. Here, we give an overview of typical measurements of topological features such as porosity, pore size, fiber diameter and orientation, hydrophobic/hydrophilic properties and water uptake, mechanical and electrical properties as well as water vapor and air permeability. Besides describing typically used methods with potential modifications, we suggest some low-cost methods as alternatives in cases where special equipment is not available.
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Affiliation(s)
- Sarah Vanessa Langwald
- Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences and Arts, 33619 Bielefeld, Germany;
| | - Andrea Ehrmann
- Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences and Arts, 33619 Bielefeld, Germany;
| | - Lilia Sabantina
- Faculty of Clothing Technology and Garment Engineering, School of Culture + Design, HTW Berlin—University of Applied Sciences, 12459 Berlin, Germany
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9
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Watanabe T, Sassi S, Ulziibayar A, Hama R, Kitsuka T, Shinoka T. The Application of Porous Scaffolds for Cardiovascular Tissues. Bioengineering (Basel) 2023; 10:bioengineering10020236. [PMID: 36829730 PMCID: PMC9952004 DOI: 10.3390/bioengineering10020236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 02/03/2023] [Accepted: 02/06/2023] [Indexed: 02/12/2023] Open
Abstract
As the number of arteriosclerotic diseases continues to increase, much improvement is still needed with treatments for cardiovascular diseases. This is mainly due to the limitations of currently existing treatment options, including the limited number of donor organs available or the long-term durability of the artificial organs. Therefore, tissue engineering has attracted significant attention as a tissue regeneration therapy in this area. Porous scaffolds are one of the effective methods for tissue engineering. However, it could be better, and its effectiveness varies depending on the tissue application. This paper will address the challenges presented by various materials and their combinations. We will also describe some of the latest methods for tissue engineering.
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Affiliation(s)
- Tatsuya Watanabe
- Center for Regenerative Medicine, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH 43205, USA
| | - Salha Sassi
- Center for Regenerative Medicine, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH 43205, USA
| | - Anudari Ulziibayar
- Center for Regenerative Medicine, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH 43205, USA
| | - Rikako Hama
- Center for Regenerative Medicine, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH 43205, USA
| | - Takahiro Kitsuka
- Center for Regenerative Medicine, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH 43205, USA
| | - Toshiharu Shinoka
- Center for Regenerative Medicine, The Abigail Wexner Research Institute at Nationwide Children’s Hospital, Columbus, OH 43205, USA
- Department of Surgery, Nationwide Children’s Hospital, Ohio State University, Columbus, OH 43205, USA
- Department of Cardiothoracic Surgery, The Heart Center, Nationwide Children’s Hospital, Columbus, OH 43205, USA
- Correspondence: ; Tel.: +1-614-355-5732
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10
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Ozdemir S, Yalcin-Enis I, Yalcinkaya B, Yalcinkaya F. An Investigation of the Constructional Design Components Affecting the Mechanical Response and Cellular Activity of Electrospun Vascular Grafts. MEMBRANES 2022; 12:929. [PMID: 36295688 PMCID: PMC9607146 DOI: 10.3390/membranes12100929] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 09/20/2022] [Accepted: 09/22/2022] [Indexed: 06/16/2023]
Abstract
Cardiovascular disease is anticipated to remain the leading cause of death globally. Due to the current problems connected with using autologous arteries for bypass surgery, researchers are developing tissue-engineered vascular grafts (TEVGs). The major goal of vascular tissue engineering is to construct prostheses that closely resemble native blood vessels in terms of morphological, mechanical, and biological features so that these scaffolds can satisfy the functional requirements of the native tissue. In this setting, morphology and cellular investigation are usually prioritized, while mechanical qualities are generally addressed superficially. However, producing grafts with good mechanical properties similar to native vessels is crucial for enhancing the clinical performance of vascular grafts, exposing physiological forces, and preventing graft failure caused by intimal hyperplasia, thrombosis, aneurysm, blood leakage, and occlusion. The scaffold's design and composition play a significant role in determining its mechanical characteristics, including suturability, compliance, tensile strength, burst pressure, and blood permeability. Electrospun prostheses offer various models that can be customized to resemble the extracellular matrix. This review aims to provide a comprehensive and comparative review of recent studies on the mechanical properties of fibrous vascular grafts, emphasizing the influence of structural parameters on mechanical behavior. Additionally, this review provides an overview of permeability and cell growth in electrospun membranes for vascular grafts. This work intends to shed light on the design parameters required to maintain the mechanical stability of vascular grafts placed in the body to produce a temporary backbone and to be biodegraded when necessary, allowing an autologous vessel to take its place.
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Affiliation(s)
- Suzan Ozdemir
- Textile Engineering Department, Textile Technologies and Design Faculty, Istanbul Technical University, Beyoglu, 34467 Istanbul, Turkey
| | - Ipek Yalcin-Enis
- Textile Engineering Department, Textile Technologies and Design Faculty, Istanbul Technical University, Beyoglu, 34467 Istanbul, Turkey
| | - Baturalp Yalcinkaya
- Department of Material Science, Faculty of Mechanical Engineering, Technical University of Liberec, 461 17 Liberec, Czech Republic
| | - Fatma Yalcinkaya
- Department of Environmental Technology, Institute for Nanomaterials, Advanced Technologies and Innovations, Technical University of Liberec, 461 17 Liberec, Czech Republic
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11
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Fortin W, Bouchet M, Therasse E, Maire M, Héon H, Ajji A, Soulez G, Lerouge S. Negative In Vivo Results Despite Promising In Vitro Data With a Coated Compliant Electrospun Polyurethane Vascular Graft. J Surg Res 2022; 279:491-504. [PMID: 35842974 DOI: 10.1016/j.jss.2022.05.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 05/09/2022] [Accepted: 05/24/2022] [Indexed: 11/15/2022]
Abstract
INTRODUCTION There is a growing need for small-diameter (<6 mm) off-the-shelf synthetic vascular conduits for different surgical bypass procedures, with actual synthetic conduits showing unacceptable thrombosis rates. The goal of this study was to build vascular grafts with better compliance than standard synthetic conduits and with an inner layer stimulating endothelialization while remaining antithrombogenic. METHODS Tubular vascular conduits made of a scaffold of polyurethane/polycaprolactone combined with a bioactive coating based on chondroitin sulfate (CS) were created using electrospinning and plasma polymerization. In vitro testing followed by a comparative in vivo trial in a sheep model as bilateral carotid bypasses was performed to assess the conduits' performance compared to the actual standard. RESULTS In vitro, the novel small-diameter (5 mm) electrospun vascular grafts coated with chondroitin sulfate (CS) showed 10 times more compliance compared to commercial expanded polytetrafluoroethylene (ePTFE) conduits while maintaining adequate suturability, burst pressure profiles, and structural stability over time. The subsequent in vivo trial was terminated after electrospun vascular grafts coated with CS showed to be inferior compared to their expanded polytetrafluoroethylene counterparts. CONCLUSIONS The inability of the experimental conduits to perform well in vivo despite promising in vitro results may be related to the low porosity of the grafts and the lack of rapid endothelialization despite the presence of the CS coating. Further research is warranted to explore ways to improve electrospun polyurethane/polycaprolactone scaffold in order to make it prone to transmural endothelialization while being resistant to strenuous conditions.
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Affiliation(s)
- William Fortin
- Research Centre, Centre Hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec, Canada; Department of Surgery, Hopital du Sacré-Coeur de Montreal, Montreal, Quebec, Canada
| | - Mélusine Bouchet
- Research Centre, Centre Hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec, Canada; Department of Mechanical Engineering, École de technologie supérieure (ÉTS), Montreal, Quebec, Canada; CREPEC, Department of Chemical Engineering, École Polytechnique de Montréal, Montreal, Quebec, Canada
| | - Eric Therasse
- Research Centre, Centre Hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec, Canada; Department of Radiology, Centre Hospitalier de l'Université de Montréal (CHUM), Quebec, Canada; Department of Radiology, Radiation Oncology and Nuclear Medicine, Faculté de Médecine, Université de Montréal, Montreal, Quebec, Canada
| | - Marion Maire
- Research Centre, Centre Hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec, Canada; Department of Mechanical Engineering, École de technologie supérieure (ÉTS), Montreal, Quebec, Canada
| | - Hélène Héon
- Research Centre, Centre Hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec, Canada
| | - Abdellah Ajji
- CREPEC, Department of Chemical Engineering, École Polytechnique de Montréal, Montreal, Quebec, Canada; Institute of Biomedical Engineering, École Polytechnique de Montréal, Montreal, Quebec, Canada
| | - Gilles Soulez
- Research Centre, Centre Hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec, Canada; Department of Radiology, Centre Hospitalier de l'Université de Montréal (CHUM), Quebec, Canada; Department of Radiology, Radiation Oncology and Nuclear Medicine, Faculté de Médecine, Université de Montréal, Montreal, Quebec, Canada
| | - Sophie Lerouge
- Research Centre, Centre Hospitalier de l'Université de Montréal (CRCHUM), Montreal, Quebec, Canada; Department of Mechanical Engineering, École de technologie supérieure (ÉTS), Montreal, Quebec, Canada; Department of Radiology, Radiation Oncology and Nuclear Medicine, Faculté de Médecine, Université de Montréal, Montreal, Quebec, Canada.
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12
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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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13
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Kitsuka T, Hama R, Ulziibayar A, Matsuzaki Y, Kelly J, Shinoka T. Clinical Application for Tissue Engineering Focused on Materials. Biomedicines 2022; 10:1439. [PMID: 35740460 PMCID: PMC9220152 DOI: 10.3390/biomedicines10061439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 06/11/2022] [Accepted: 06/15/2022] [Indexed: 11/16/2022] Open
Abstract
Cardiovascular-related medical conditions remain a significant cause of death worldwide despite the advent of tissue engineering research more than half a century ago. Although autologous tissue is still the preferred treatment, donor tissue is limited, and there remains a need for tissue-engineered vascular grafts (TEVGs). The production of extensive vascular tissue (>1 cm3) in vitro meets the clinical needs of tissue grafts and biological research applications. The use of TEVGs in human patients remains limited due to issues related to thrombogenesis and stenosis. In addition to the advancement of simple manufacturing methods, the shift of attention to the combination of synthetic polymers and bio-derived materials and cell sources has enabled synergistic combinations of vascular tissue development. This review details the selection of biomaterials, cell sources and relevant clinical trials related to large diameter vascular grafts. Finally, we will discuss the remaining challenges in the tissue engineering field resulting from complex requirements by covering both basic and clinical research from the perspective of material design.
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Affiliation(s)
- Takahiro Kitsuka
- Center for Regenerative Medicine, Nationwide Children’s Hospital, Columbus, OH 43205, USA; (T.K.); (R.H.); (A.U.); (Y.M.); (J.K.)
| | - Rikako Hama
- Center for Regenerative Medicine, Nationwide Children’s Hospital, Columbus, OH 43205, USA; (T.K.); (R.H.); (A.U.); (Y.M.); (J.K.)
- Department of Biotechnology and Life Science, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-Cho, Koganei 184-8588, Japan
| | - Anudari Ulziibayar
- Center for Regenerative Medicine, Nationwide Children’s Hospital, Columbus, OH 43205, USA; (T.K.); (R.H.); (A.U.); (Y.M.); (J.K.)
| | - Yuichi Matsuzaki
- Center for Regenerative Medicine, Nationwide Children’s Hospital, Columbus, OH 43205, USA; (T.K.); (R.H.); (A.U.); (Y.M.); (J.K.)
| | - John Kelly
- Center for Regenerative Medicine, Nationwide Children’s Hospital, Columbus, OH 43205, USA; (T.K.); (R.H.); (A.U.); (Y.M.); (J.K.)
| | - Toshiharu Shinoka
- Center for Regenerative Medicine, Nationwide Children’s Hospital, Columbus, OH 43205, USA; (T.K.); (R.H.); (A.U.); (Y.M.); (J.K.)
- Department of Cardiothoracic Surgery, Nationwide Children’s Hospital, Columbus, OH 43205, USA
- Department of Surgery, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA
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14
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Suh T, Twiddy J, Mahmood N, Ali KM, Lubna MM, Bradford PD, Daniele MA, Gluck JM. Electrospun Carbon Nanotube-Based Scaffolds Exhibit High Conductivity and Cytocompatibility for Tissue Engineering Applications. ACS OMEGA 2022; 7:20006-20019. [PMID: 35721944 PMCID: PMC9202252 DOI: 10.1021/acsomega.2c01807] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Accepted: 05/17/2022] [Indexed: 06/01/2023]
Abstract
Carbon nanotubes (CNTs) are known for their excellent conductive properties. Here, we present two novel methods, "sandwich" (sCNT) and dual deposition (DD CNT), for incorporating CNTs into electrospun polycaprolactone (PCL) and gelatin scaffolds to increase their conductance. Based on CNT percentage, the DD CNT scaffolds contain significantly higher quantities of CNTs than the sCNT scaffolds. The inclusion of CNTs increased the electrical conductance of scaffolds from 0.0 ± 0.00 kS (non-CNT) to 0.54 ± 0.10 kS (sCNT) and 5.22 ± 0.49 kS (DD CNT) when measured parallel to CNT arrays and to 0.25 ± 0.003 kS (sCNT) and 2.85 ± 1.12 (DD CNT) when measured orthogonally to CNT arrays. The inclusion of CNTs increased fiber diameter and pore size, promoting cellular migration into the scaffolds. CNT inclusion also decreased the degradation rate and increased hydrophobicity of scaffolds. Additionally, CNT inclusion increased Young's modulus and failure load of scaffolds, increasing their mechanical robustness. Murine fibroblasts were maintained on the scaffolds for 30 days, demonstrating high cytocompatibility. The increased conductivity and high cytocompatibility of the CNT-incorporated scaffolds make them appropriate candidates for future use in cardiac and neural tissue engineering.
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Affiliation(s)
- Taylor
C. Suh
- Department
of Textile Engineering, Chemistry, and Science, North Carolina State University, Raleigh, North Carolina 27606, United States
| | - Jack Twiddy
- Joint
Department of Biomedical Engineering, North
Carolina State University and The University of North Carolina at
Chapel Hill, Raleigh, North Carolina 27606, United States
| | - Nasif Mahmood
- Department
of Textile Engineering, Chemistry, and Science, North Carolina State University, Raleigh, North Carolina 27606, United States
| | - Kiran M. Ali
- Department
of Textile Engineering, Chemistry, and Science, North Carolina State University, Raleigh, North Carolina 27606, United States
| | - Mostakima M. Lubna
- Department
of Textile Engineering, Chemistry, and Science, North Carolina State University, Raleigh, North Carolina 27606, United States
| | - Philip D. Bradford
- Department
of Textile Engineering, Chemistry, and Science, North Carolina State University, Raleigh, North Carolina 27606, United States
| | - Michael A. Daniele
- Joint
Department of Biomedical Engineering, North
Carolina State University and The University of North Carolina at
Chapel Hill, Raleigh, North Carolina 27606, United States
- Department
of Electrical and Computer Engineering, North Carolina State University, Raleigh, North Carolina 27606, United States
| | - Jessica M. Gluck
- Department
of Textile Engineering, Chemistry, and Science, North Carolina State University, Raleigh, North Carolina 27606, United States
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15
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Dokuchaeva AA, Timchenko TP, Karpova EV, Vladimirov SV, Soynov IA, Zhuravleva IY. Effects of Electrospinning Parameter Adjustment on the Mechanical Behavior of Poly-ε-caprolactone Vascular Scaffolds. Polymers (Basel) 2022; 14:polym14020349. [PMID: 35054754 PMCID: PMC8780554 DOI: 10.3390/polym14020349] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 01/06/2022] [Accepted: 01/11/2022] [Indexed: 11/16/2022] Open
Abstract
Electrospinning is a perspective method widely suggested for use in bioengineering applications, but the variability in currently available data and equipment necessitates additional research to ascertain the desirable methodology. In this study, we aimed to describe the effects of electrospinning technique alterations on the structural and mechanical properties of (1,7)-polyoxepan-2-one (poly-ε-caprolactone, PCL) scaffolds, such as circumferential and longitudinal stress/strain curves, in comparison with corresponding properties of fresh rat aorta samples. Scaffolds manufactured under different electrospinning modes were analyzed and evaluated using scanning electronic microscopy as well as uniaxial longitudinal and circumferential tensile tests. Fiber diameter was shown to be the most crucial characteristic of the scaffold, correlating with its mechanical properties.
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Affiliation(s)
- Anna A. Dokuchaeva
- Institute of Experimental Biology and Medicine, E. Meshalkin National Medical Research Center of the RF Ministry of Health, 15 Rechkunovskaya St., Novosibirsk 630055, Russia; (T.P.T.); (S.V.V.); (I.A.S.); (I.Y.Z.)
- Correspondence: ; Tel.: +7-383-347-60-47
| | - Tatyana P. Timchenko
- Institute of Experimental Biology and Medicine, E. Meshalkin National Medical Research Center of the RF Ministry of Health, 15 Rechkunovskaya St., Novosibirsk 630055, Russia; (T.P.T.); (S.V.V.); (I.A.S.); (I.Y.Z.)
| | - Elena V. Karpova
- Center of Spectral Investigations, Group of Optical Spectrometry, N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry SB RAS, 9 Lavrentiev Avenue, Novosibirsk 630090, Russia;
| | - Sergei V. Vladimirov
- Institute of Experimental Biology and Medicine, E. Meshalkin National Medical Research Center of the RF Ministry of Health, 15 Rechkunovskaya St., Novosibirsk 630055, Russia; (T.P.T.); (S.V.V.); (I.A.S.); (I.Y.Z.)
| | - Ilya A. Soynov
- Institute of Experimental Biology and Medicine, E. Meshalkin National Medical Research Center of the RF Ministry of Health, 15 Rechkunovskaya St., Novosibirsk 630055, Russia; (T.P.T.); (S.V.V.); (I.A.S.); (I.Y.Z.)
| | - Irina Y. Zhuravleva
- Institute of Experimental Biology and Medicine, E. Meshalkin National Medical Research Center of the RF Ministry of Health, 15 Rechkunovskaya St., Novosibirsk 630055, Russia; (T.P.T.); (S.V.V.); (I.A.S.); (I.Y.Z.)
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16
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Fazal F, Raghav S, Callanan A, Koutsos V, Radacsi N. Recent advancements in the bioprinting of vascular grafts. Biofabrication 2021; 13. [PMID: 34102613 DOI: 10.1088/1758-5090/ac0963] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 06/08/2021] [Indexed: 02/07/2023]
Abstract
Recent advancements in the bioinks and three-dimensional (3D) bioprinting methods used to fabricate vascular constructs are summarized herein. Critical biomechanical properties required to fabricate an ideal vascular graft are highlighted, as well as various testing methods have been outlined to evaluate the bio-fabricated grafts as per the Food and Drug Administration (FDA) and International Organization for Standardization (ISO) guidelines. Occlusive artery disease and cardiovascular disease are the major causes of death globally. These diseases are caused by the blockage in the arteries, which results in a decreased blood flow to the tissues of major organs in the body, such as the heart. Bypass surgery is often performed using a vascular graft to re-route the blood flow. Autologous grafts represent a gold standard for such bypass surgeries; however, these grafts may be unavailable due to the previous harvesting or possess a poor quality. Synthetic grafts serve well for medium to large-sized vessels, but they fail when used to replace small-diameter vessels, generally smaller than 6 mm. Various tissue engineering approaches have been used to address the urgent need for vascular graft that can withstand hemodynamic blood pressure and has the ability to grow and remodel. Among these approaches, 3D bioprinting offers an attractive solution to construct patient-specific vessel grafts with layered biomimetic structures.
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Affiliation(s)
- Faraz Fazal
- School of Engineering, Institute for Materials and Processes, The University of Edinburgh, Robert Stevenson Road, EH9 3FB Edinburgh, United Kingdom.,Department of Mechanical Engineering, University of Engineering and Technology, Lahore, (New Campus) Pakistan
| | - Sakshika Raghav
- School of Engineering, Institute for Materials and Processes, The University of Edinburgh, Robert Stevenson Road, EH9 3FB Edinburgh, United Kingdom
| | - Anthony Callanan
- School of Engineering, Institute for Bioengineering, The University of Edinburgh, The King's Buildings, EH9 3JL Edinburgh, United Kingdom
| | - Vasileios Koutsos
- School of Engineering, Institute for Materials and Processes, The University of Edinburgh, Robert Stevenson Road, EH9 3FB Edinburgh, United Kingdom
| | - Norbert Radacsi
- School of Engineering, Institute for Materials and Processes, The University of Edinburgh, Robert Stevenson Road, EH9 3FB Edinburgh, United Kingdom
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17
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Bai S, Zhang X, Zang L, Yang S, Chen X, Yuan X. Electrospinning of Biomaterials for Vascular Regeneration. Chem Res Chin Univ 2021. [DOI: 10.1007/s40242-021-1125-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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18
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Niu Y, Liu G, Fu M, Chen C, Fu W, Zhang Z, Xia H, Stadler FJ. Designing a multifaceted bio-interface nanofiber tissue-engineered tubular scaffold graft to promote neo-vascularization for urethral regeneration. J Mater Chem B 2021; 8:1748-1758. [PMID: 32031190 DOI: 10.1039/c9tb01915d] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Reconstitution of urethral defects through a tissue-engineered autologous urethra is an exciting area of clinical urology research. Despite rapid advances in this field, a tissue-engineered urethra is still inaccessible to clinical applications because of the poor vascularization of the current scaffold materials, especially for the reconstruction of complex urethral defects. In this study, we report the preparation of multifaceted bio-interfacing tissue-engineered autologous scaffolds based on alternating block polyurethane (abbreviated as PU-alt), a kind of tubular scaffold with a hierarchical nanofiber architecture, flexible mechanical properties and a hydrophilic PEGylation interface capable of promoting adhesion, oriented elongation, and proliferation of New Zealand rabbit autologous urethral epithelial cells (ECs) and smooth muscle cells (SMCs) simultaneously, and also upregulating the expression of keratin (AE1/AE3) in ECs and contractile protein (α-SMA) in SMCs as well as the subsequent synthesis of elastin. Three months in vivo scaffold substitution of rabbit urethras displayed that the engineered autologous PU-alt scaffold grafts, with a coating rich in seed cell-matrix, could induce local neo-vascularization, facilitating oriented SMC remodeling and lumen epithelialization as well as patency. Our findings indicate a central role of the synergistic interplay of seed cell-matrix bio-interface and nano-topographic cues in the vascularized urethral reconstruction.
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Affiliation(s)
- Yuqing Niu
- Department of Pediatric Surgery, Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou 510623, Guangdong, China. and Nanshan District Key Lab for Biopolymers and Safety Evaluation, Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518055, P. R. China. and State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Guochang Liu
- Department of Pediatric Urology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou 510623, Guangdong, China
| | - Ming Fu
- Department of Pediatric Urology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou 510623, Guangdong, China
| | - Chuangbi Chen
- Nanshan District Key Lab for Biopolymers and Safety Evaluation, Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518055, P. R. China.
| | - Wen Fu
- Department of Pediatric Urology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou 510623, Guangdong, China
| | - Zhao Zhang
- Department of Pediatric Urology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou 510623, Guangdong, China
| | - Huimin Xia
- Department of Pediatric Surgery, Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou 510623, Guangdong, China. and State Key Laboratory of Virology, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, 430071, China
| | - Florian J Stadler
- Nanshan District Key Lab for Biopolymers and Safety Evaluation, Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518055, P. R. China.
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19
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Bellani C, Yue K, Flaig F, Hébraud A, Ray P, Annabi N, Selistre de Araújo HS, Branciforti MC, Minarelli Gaspar AM, Shin SR, Khademhosseini A, Schlatter G. Suturable elastomeric tubular grafts with patterned porosity for rapid vascularization of 3D constructs. Biofabrication 2021; 13. [PMID: 33482658 DOI: 10.1088/1758-5090/abdf1d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 01/22/2021] [Indexed: 12/11/2022]
Abstract
Vascularization is considered to be one of the key challenges in engineering functional 3D tissues. Engineering suturable vascular grafts containing pores with diameter of several tens of microns in tissue engineered constructs may provide an instantaneous blood perfusion through the grafts improving cell infiltration and thus, allowing rapid vascularization and vascular branching. The aim of this work was to develop suturable tubular scaffolds to be integrated in biofabricated constructs, enabling the direct connection of the biofabricated construct with the host blood stream, providing an immediate blood flow inside the construct. Here, tubular grafts with customizable shapes (tubes, Y-shape capillaries) and controlled diameter ranging from several hundreds of microns to few mm are fabricated based on poly(glycerol sebacate) (PGS) / poly(vinyl alcohol) (PVA) electrospun scaffolds. Furthermore, a network of pore channels of diameter in the order of 100 µm was machined by laser femtosecond ablation in the tube wall. Both non-machined and laser machined tubular scaffolds elongated more than 100% of their original size have shown suture retention, being 5.85 and 3.96 N/mm2 respectively. To demonstrate the potential of application, the laser machined porous grafts were embedded in gelatin methacryloyl (GelMA) hydrogels, resulting in elastomeric porous tubular graft/GelMA 3D constructs. These constructs were then co-seeded with osteoblast-like cells (MG-63) at the external side of the graft and endothelial cells (HUVEC) inside, forming a bone osteon model. The laser machined pore network allowed an immediate endothelial cell flow towards the osteoblasts enabling the osteoblasts and endothelial cells to interact and form 3D structures. This rapid vascularization approach could be applied, not only for bone tissue regeneration, but also for a variety of tissues and organs.
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Affiliation(s)
- Caroline Bellani
- University of Sao Paulo, AVENIDA TRABALHADOR SÃO-CARLENSE, 400, Sao Carlos, São Paulo, 13566-590, BRAZIL
| | - Kan Yue
- South China Advanced Institute for Soft Matter Science and Technology, South China University of Technology, 381 Wushan Rd, Guangzhou, Guangdong, 510641, CHINA
| | - Florence Flaig
- ICPEES, University of Strasbourg, 25 rue Bécquerel, Strasbourg, 67087, FRANCE
| | - Anne Hébraud
- ICPEES, 25 rue Bécquerel, Strasbourg, 67087, FRANCE
| | - Pengfei Ray
- Division of Health Sciences and Technology, MIT, 45 Carleton Street, Cambridge, Massachusetts, 02142, UNITED STATES
| | - Nasim Annabi
- Department of Chemical and Biomolecular Engineering, UCLA, 5531 Boelter Hall, Los Angeles, California, CA 90095, UNITED STATES
| | | | - Marcia Cristina Branciforti
- Depatament of Materials Engineering, University of Sao Paulo, AVENIDA TRABALHADOR SÃO-CARLENSE, 400, ARNOLD SCHMITED, SAO CARLOS, Sao Paulo, SAO PAULO, 13566-590, BRAZIL
| | - Ana Maria Minarelli Gaspar
- Department of Morphology, School of Dentistry at Araraquara, Sao Paulo State University Julio de Mesquita Filho, R. Humaitá, 1680, Araraquara, SP, 14801-385, BRAZIL
| | - Su Ryon Shin
- Medicine, Harvard Medical School, 25 Shattuck Street, Boston, Massachusetts, MA 02115, UNITED STATES
| | - Ali Khademhosseini
- Department of Chemical and Biomolecular Engineering, UCLA, 5531 Boelter Hall, Los Angeles, California, CA 90095, UNITED STATES
| | - Guy Schlatter
- ICPEES, University of Strasbourg, 25 rue Bécquerel, Strasbourg, 67087, FRANCE
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20
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Pohan G, Mattiassi S, Yao Y, Zaw AM, Anderson DE, Cutiongco MF, Hinds MT, Yim EK. Effect of Ethylene Oxide Sterilization on Polyvinyl Alcohol Hydrogel Compared with Gamma Radiation. Tissue Eng Part A 2020; 26:1077-1090. [PMID: 32264787 PMCID: PMC7580577 DOI: 10.1089/ten.tea.2020.0002] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Accepted: 04/06/2020] [Indexed: 12/21/2022] Open
Abstract
This study investigated the effects of terminal sterilization of polyvinyl alcohol (PVA) biomaterials using clinically translatable techniques, specifically ethylene oxide (EtO) and gamma (γ) irradiation. While a few studies have reported the possibility of sterilizing PVA with γ-radiation, the use of EtO sterilization of PVA requires additional study. PVA solutions were chemically crosslinked with trisodium trimetaphosphate and sodium hydroxide. The three experimental groups included untreated control, EtO, and γ-irradiation, which were tested for the degree of swelling and water content, and mechanical properties such as radial compliance, longitudinal tensile, minimum bend radius, burst pressure, and suture retention strength. In addition, samples were characterized with scanning electron microscopy, differential scanning calorimetry, X-ray photoelectron spectroscopy, and water contact angle measurements. Cell attachment was assessed using the endothelial cell line EA.hy926, and the sterilized PVA cytotoxicity was studied with a live/dead stain. Platelet and fibrin accumulation was measured using an ex vivo shunt baboon model. Finally, the immune responses of PVA implants were analyzed after a 21-day subcutaneous implantation in rats and a 30-day implantation in baboon. EtO sterilization reduced the PVA graft wall thickness, its degree of swelling, and water content compared with both γ-irradiated and untreated PVA. Moreover, EtO sterilization significantly reduced the radial compliance and increased Young's modulus. EtO did not change PVA hydrophilicity, while γ-irradiation increased the water contact angle of the PVA. Consequently, endothelial cell attachment on the EtO-sterilized PVA showed similar results to the untreated PVA, while cell attachment significantly improved on the γ-irradiated PVA. When exposing the PVA grafts to circulating whole blood, fibrin accumulation of EtO-sterilized PVA was found to be significantly lower than γ-irradiated PVA. The immune responses of γ-irradiated PVA, EtO-treated PVA, and untreated PVA were compared. Implanted EtO-treated PVA showed the least MAC387 reaction. The terminal sterilization methods in this study changed PVA hydrogel properties; nevertheless, based on the characterizations performed, both sterilization methods were suitable for sterilizing PVA. We concluded that EtO can be used as an alternative method to sterilize PVA hydrogel material. Impact statement Polyvinyl alcohol (PVA) hydrogels have been used for a variety of tissue replacements, including neural, cardiac, meniscal, cartilage, muscle, pancreatic, and ocular applications. In addition, PVA can be made into a tubular shape and used as a small-diameter vascular graft. Ethylene oxide (EtO) is one of the Food and Drug Administration-approved methods for sterilization, but its effect on PVA has not been studied extensively. The outcome of this study provides the effects of EtO and γ-irradiation of PVA grafts on both the material properties and the in vivo responses, particularly for vascular applications. Knowledge of these effects may ultimately improve the success rate of PVA vascular grafts.
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Affiliation(s)
- Grace Pohan
- Department of Chemical Engineering, University of Waterloo, Waterloo, Canada
| | - Sabrina Mattiassi
- Department of Chemical Engineering, University of Waterloo, Waterloo, Canada
| | - Yuan Yao
- Department of Chemical Engineering, University of Waterloo, Waterloo, Canada
| | - Aung Moe Zaw
- Department of Chemical Engineering, University of Waterloo, Waterloo, Canada
| | - Deirdre E.J. Anderson
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, Oregon, USA
| | - Marie F.A. Cutiongco
- Mechanobiology Institute Singapore, National University of Singapore, Singapore, Singapore
| | - Monica T. Hinds
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, Oregon, USA
| | - Evelyn K.F. Yim
- Department of Chemical Engineering, University of Waterloo, Waterloo, Canada
- Center for Biotechnology and Bioengineering, University of Waterloo, Waterloo, Canada
- Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Canada
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21
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Rahmati Nejad M, Yousefzadeh M, Solouk A. Electrospun PET/PCL small diameter nanofibrous conduit for biomedical application. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 110:110692. [PMID: 32204006 DOI: 10.1016/j.msec.2020.110692] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 01/23/2020] [Accepted: 01/23/2020] [Indexed: 12/20/2022]
Abstract
In recent years, the mortality rate caused by cardiovascular diseases has increased dramatically around the world. Tissue engineering is considered as a novel and efficient approach to offer a substituent of engineered tissues for defective body tissues. For this purpose, fabrication of the scaffold that resembles the physical and mechanical properties of natural body vessels, and culturing appropriate cells seems to be a promising approach. Due to the fibrous structure of the vascular wall, the nanofibrous scaffold produced by electrospinning could be a proper choice for vascular tissue engineering. One of the main properties of artificial vessels is its mechanical properties consistency with the native one in order to mimic its natural characteristics. To do so, in present study two biocompatible polymers, polyethylene terephthalate (PET) and polycaprolactone (PCL) with different blend ratio were electrospun into a tubular nanofibrous structure with 6 mm internal diameter and the mechanical properties such as tensile strength, modulus, compliance, bursting pressure, elastic recovery, and suture retention were investigated. The results revealed that PET/PCL (1:3) had better similar properties with the reported natural one as its longitudinal and transverse tensile strength was about 9.47 and 6.38 MPa, respectively. The longitudinal strain at break, compliance, bursting pressure, and suture retention were 205.88 ± 51.12%, 4.19 ± 0.78%/100 mmHg, 6378.76 ± 2159.20 mmHg, and 287.73 ± 13.10 gmf, respectively. The elasticity of this studied sample was 60.21 ± 12.49% as it was relieved, and this may be a good candidate for the artificial vessel in this size, as the MTT test confirmed its appropriate substrate for cell culture.
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Affiliation(s)
- Maryam Rahmati Nejad
- Textile Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran 1591634311, Iran.
| | - Maryam Yousefzadeh
- Textile Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran 1591634311, Iran.
| | - Atefeh Solouk
- Biomedical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran 1591634311, Iran.
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22
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Niu Y, Liu G, Chen C, Fu M, Fu W, Zhao Z, Xia H, Stadler FJ. Urethral reconstruction using an amphiphilic tissue-engineered autologous polyurethane nanofiber scaffold with rapid vascularization function. Biomater Sci 2020; 8:2164-2174. [DOI: 10.1039/c9bm01911a] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
We report the efficient application of a well-layered tubular amphiphilic nanofiber of a polyurethane copolymer (PU-ran) for the regulation the phenotypic expression of epithelial cells (ECs) and smooth muscle cells (SMCs) for vascularized urethral reconstruction.
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Affiliation(s)
- Yuqing Niu
- Department of Pediatric Surgery
- Guangzhou Institute of Pediatrics
- Guangzhou Women and Children's Medical Center
- Guangzhou Medical University
- Guangzhou 510623
| | - Guochang Liu
- Department of Pediatric Urology
- Guangzhou Women and Children's Medical Center
- Guangzhou Medical University
- Guangzhou 510623
- China
| | - Chuangbi Chen
- Nanshan District Key Lab for Biopolymers and Safety Evaluation
- Shenzhen Key Laboratory of Polymer Science and Technology
- Guangdong Research Center for Interfacial Engineering of Functional Materials
- College of Materials Science and Engineering
- Shenzhen University
| | - Ming Fu
- Department of Pediatric Urology
- Guangzhou Women and Children's Medical Center
- Guangzhou Medical University
- Guangzhou 510623
- China
| | - Wen Fu
- Department of Pediatric Urology
- Guangzhou Women and Children's Medical Center
- Guangzhou Medical University
- Guangzhou 510623
- China
| | - Zhang Zhao
- Department of Pediatric Urology
- Guangzhou Women and Children's Medical Center
- Guangzhou Medical University
- Guangzhou 510623
- China
| | - Huimin Xia
- Department of Pediatric Surgery
- Guangzhou Institute of Pediatrics
- Guangzhou Women and Children's Medical Center
- Guangzhou Medical University
- Guangzhou 510623
| | - Florian J. Stadler
- Nanshan District Key Lab for Biopolymers and Safety Evaluation
- Shenzhen Key Laboratory of Polymer Science and Technology
- Guangdong Research Center for Interfacial Engineering of Functional Materials
- College of Materials Science and Engineering
- Shenzhen University
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23
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Zhalmuratova D, La TG, Yu KTT, Szojka ARA, Andrews SHJ, Adesida AB, Kim CI, Nobes DS, Freed DH, Chung HJ. Mimicking "J-Shaped" and Anisotropic Stress-Strain Behavior of Human and Porcine Aorta by Fabric-Reinforced Elastomer Composites. ACS APPLIED MATERIALS & INTERFACES 2019; 11:33323-33335. [PMID: 31464413 DOI: 10.1021/acsami.9b10524] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
An ex vivo heart perfusion device preserves the donor heart in a warm beating state during transfer between extraction and implantation surgeries. One of the current challenges includes the use of rigid and noncompliant plastic tubes, which causes injuries to the heart at the junction between the tissue and the tube. The compliant and rapidly strain-stiffening mechanical property that generates a "J-shaped" stress-strain behavior is necessary for producing the Windkessel effect, which ensures continuous flow of blood through the aorta. In this study, we mimic the J-shaped and anisotropic stress-strain behavior of human aorta in synthetic elastomers to replace the problematic noncompliant plastic tube. First, we assess the mechanical properties of human (n = 1) and porcine aorta (n = 14) to quantify the nonlinear and anisotropic behavior under uniaxial tensile stress from five different regions of the aorta. Second, fabric-reinforced elastomer composites were prepared by reinforcing silicone elastomers with embedded fabrics in a trilayer geometry. The knitted structures of the fabric provide strain-stiffening as well as anisotropic mechanical properties of the resulting composite in a deterministic manner. By optimizing the combination between different elastomers and fabrics, the resulting composites matched the J-shaped and anisotropic stress-strain behavior of natural human and porcine aorta. Finally, improved analytical constitutive models based on Gent's and Mooney-Rivlin's constitutive model (to describe the elastomer matrix) combined with Holzapfel-Gasser-Ogden's model (to represent the stiffer fabrics) were developed to describe the J-shaped behavior of the natural aortas and the fabric-reinforced composites. We anticipate that the suggested fabric-reinforced silicone elastomer composite design concept can be used to develop complex soft biomaterials, as well as in emerging engineering fields such as soft robotics and microfluidics, where the Windkessel effect can be useful in regulating the flow of fluids.
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Affiliation(s)
| | | | | | - Alexander R A Szojka
- Department of Surgery , University of Alberta , Edmonton , Alberta T6G 2E1 , Canada
| | - Stephen H J Andrews
- Department of Surgery , University of Alberta , Edmonton , Alberta T6G 2E1 , Canada
| | - Adetola B Adesida
- Department of Surgery , University of Alberta , Edmonton , Alberta T6G 2E1 , Canada
| | | | | | - Darren H Freed
- Department of Surgery , University of Alberta , Edmonton , Alberta T6G 2E1 , Canada
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