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Xing J, Zhang M, Liu X, Wang C, Xu N, Xing D. Multi-material electrospinning: from methods to biomedical applications. Mater Today Bio 2023; 21:100710. [PMID: 37545561 PMCID: PMC10401296 DOI: 10.1016/j.mtbio.2023.100710] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 06/03/2023] [Accepted: 06/16/2023] [Indexed: 08/08/2023] Open
Abstract
Electrospinning as a versatile, simple, and cost-effective method to engineer a variety of micro or nanofibrous materials, has contributed to significant developments in the biomedical field. However, the traditional electrospinning of single material only can produce homogeneous fibrous assemblies with limited functional properties, which oftentimes fails to meet the ever-increasing requirements of biomedical applications. Thus, multi-material electrospinning referring to engineering two or more kinds of materials, has been recently developed to enable the fabrication of diversified complex fibrous structures with advanced performance for greatly promoting biomedical development. This review firstly gives an overview of multi-material electrospinning modalities, with a highlight on their features and accessibility for constructing different complex fibrous structures. A perspective of how multi-material electrospinning opens up new opportunities for specific biomedical applications, i.e., tissue engineering and drug delivery, is also offered.
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Affiliation(s)
- Jiyao Xing
- The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, China
- Qingdao Cancer Institute, Qingdao, 266071, China
| | - Miao Zhang
- The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, China
- Qingdao Cancer Institute, Qingdao, 266071, China
| | - Xinlin Liu
- The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, China
- Qingdao Cancer Institute, Qingdao, 266071, China
| | - Chao Wang
- The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, China
- Qingdao Cancer Institute, Qingdao, 266071, China
| | - Nannan Xu
- School of Computer Science and Technology, Ocean University of China, Qingdao, 266000, China
| | - Dongming Xing
- The Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, 266071, China
- Qingdao Cancer Institute, Qingdao, 266071, China
- School of Life Sciences, Tsinghua University, Beijing, 100084, China
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2
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Lin M, Hu Y, An H, Guo T, Gao Y, Peng K, Zhao M, Zhang X, Zhou H. Silk fibroin-based biomaterials for disc tissue engineering. Biomater Sci 2023; 11:749-776. [PMID: 36537344 DOI: 10.1039/d2bm01343f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Low back pain is the major cause of disability worldwide, and intervertebral disc degeneration (IVDD) is one of the most important causes of low back pain. Currently, there is no method to treat IVDD that can reverse or regenerate intervertebral disc (IVD) tissue, but the recent development of disc tissue engineering (DTE) offers a new means of addressing these disadvantages. Among numerous biomaterials for tissue engineering, silk fibroin (SF) is widely used due to its easy availability and excellent physical/chemical properties. SF is usually used in combination with other materials to construct biological scaffolds or bioactive substance delivery systems, or it can be used alone. The present article first briefly outlines the anatomical and physiological features of IVD, the associated etiology and current treatment modalities of IVDD, and the current status of DTE. Then, it highlights the characteristics of SF biomaterials and their latest research advances in DTE and discusses the prospects and challenges in the application of SF in DTE, with a view to facilitating the clinical process of developing interventions related to IVD-derived low back pain caused by IVDD.
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Affiliation(s)
- Maoqiang Lin
- Department of Orthopedics, Lanzhou University Second Hospital, Lanzhou 730030, Gansu, China. .,Key Laboratory of Bone and Joint Disease Research of Gansu Province, Lanzhou 730030, Gansu, China
| | - Yicun Hu
- Department of Orthopedics, Lanzhou University Second Hospital, Lanzhou 730030, Gansu, China. .,Key Laboratory of Bone and Joint Disease Research of Gansu Province, Lanzhou 730030, Gansu, China
| | - Haiying An
- Department of Laboratory Medicine, Zhongnan Hospital, Wuhan University, Wuhan 430000, Hubei, China
| | - Taowen Guo
- Department of Orthopedics, Lanzhou University Second Hospital, Lanzhou 730030, Gansu, China. .,Key Laboratory of Bone and Joint Disease Research of Gansu Province, Lanzhou 730030, Gansu, China
| | - Yanbing Gao
- Department of Orthopedics, Lanzhou University Second Hospital, Lanzhou 730030, Gansu, China. .,Key Laboratory of Bone and Joint Disease Research of Gansu Province, Lanzhou 730030, Gansu, China
| | - Kaichen Peng
- Department of Orthopedics, Lanzhou University Second Hospital, Lanzhou 730030, Gansu, China. .,Key Laboratory of Bone and Joint Disease Research of Gansu Province, Lanzhou 730030, Gansu, China
| | - Meiling Zhao
- Key Laboratory of Bone and Joint Disease Research of Gansu Province, Lanzhou 730030, Gansu, China
| | - Xiaobo Zhang
- Department of Orthopedics, Honghui Hospital, Xi'an Jiaotong University, Xi'an 710000, Shaanxi, China.
| | - Haiyu Zhou
- Department of Orthopedics, Lanzhou University Second Hospital, Lanzhou 730030, Gansu, China. .,Key Laboratory of Bone and Joint Disease Research of Gansu Province, Lanzhou 730030, Gansu, China
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3
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Vermue IJM, Begum R, Castilho M, Rookmaaker MB, Masereeuw R, Bouten CVC, Verhaar MC, Cheng C. Renal Biology Driven Macro- and Microscale Design Strategies for Creating an Artificial Proximal Tubule Using Fiber-Based Technologies. ACS Biomater Sci Eng 2021; 7:4679-4693. [PMID: 34490771 PMCID: PMC8512683 DOI: 10.1021/acsbiomaterials.1c00408] [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] [Indexed: 11/30/2022]
Abstract
![]()
Chronic kidney disease
affects one in six people worldwide. Due
to the scarcity of donor kidneys and the complications associated
with hemodialysis (HD), a cell-based bioartificial kidney (BAK) device
is desired. One of the shortcomings of HD is the lack of active transport
of solutes that would normally be performed by membrane transporters
in kidney epithelial cells. Specifically, proximal tubule (PT) epithelial
cells play a major role in the active transport of metabolic waste
products. Therefore, a BAK containing an artificial PT to actively
transport solutes between the blood and the filtrate could provide
major therapeutic advances. Creating such an artificial PT requires
a biocompatible tubular structure which supports the adhesion and
function of PT-specific epithelial cells. Ideally, this scaffold should
structurally replicate the natural PT basement membrane which consists
mainly of collagen fibers. Fiber-based technologies such as electrospinning
are therefore especially promising for PT scaffold manufacturing.
This review discusses the use of electrospinning technologies to generate
an artificial PT scaffold for ex vivo/in
vivo cellularization. We offer a comparison of currently
available electrospinning technologies and outline the desired scaffold
properties required to serve as a PT scaffold. Discussed also are
the potential technologies that may converge in the future, enabling
the effective and biomimetic incorporation of synthetic PTs in to
BAK devices and beyond.
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Affiliation(s)
- IJsbrand M Vermue
- Department of Nephrology and Hypertension, University Medical Center Utrecht, 3508 GA Utrecht, The Netherlands
| | - Runa Begum
- Department of Nephrology and Hypertension, University Medical Center Utrecht, 3508 GA Utrecht, The Netherlands
| | - Miguel Castilho
- Department of Orthopaedics, University Medical Center Utrecht, 3508 GA Utrecht, The Netherlands.,Regenerative Medicine Center Utrecht, 3508 GA Utrecht, The Netherlands.,Department of Biomedical Engineering, Eindhoven University of Technology, 5612 AZ Eindhoven, The Netherlands
| | - Maarten B Rookmaaker
- Department of Nephrology and Hypertension, University Medical Center Utrecht, 3508 GA Utrecht, The Netherlands
| | - Rosalinde Masereeuw
- Regenerative Medicine Center Utrecht, 3508 GA Utrecht, The Netherlands.,Division of Pharmacology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, 3584 CS Utrecht, The Netherlands
| | - Carlijn V C Bouten
- Department of Biomedical Engineering, Eindhoven University of Technology, 5612 AZ Eindhoven, The Netherlands.,Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, 5612 AZ Eindhoven, The Netherlands
| | - Marianne C Verhaar
- Department of Nephrology and Hypertension, University Medical Center Utrecht, 3508 GA Utrecht, The Netherlands
| | - Caroline Cheng
- Department of Nephrology and Hypertension, University Medical Center Utrecht, 3508 GA Utrecht, The Netherlands.,Experimental Cardiology, Department of Cardiology, Thorax Center, Erasmus University Medical Center Rotterdam, 3015 GD Rotterdam, The Netherlands
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4
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Tanaka T, Ibe Y, Jono T, Tanaka R, Naito A, Asakura T. Characterization of a Water-Dispersed Biodegradable Polyurethane-Silk Composite Sponge Using 13C Solid-State Nuclear Magnetic Resonance as Coating Material for Silk Vascular Grafts with Small Diameters. Molecules 2021; 26:4649. [PMID: 34361802 PMCID: PMC8347230 DOI: 10.3390/molecules26154649] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 07/12/2021] [Accepted: 07/27/2021] [Indexed: 11/30/2022] Open
Abstract
Recently, Bombyx mori silk fibroin (SF) has been shown to be a suitable material for vascular prostheses for small arteries. In this study, we developed a softer SF graft by coating water-dispersed biodegradable polyurethane (PU) based on polycaprolactone and an SF composite sponge on the knitted SF vascular graft. Three kinds of 13C solid-state nuclear magnetic resonance (NMR), namely carbon-13 (13C) cross-polarization/magic angle spinning (MAS), 13C dipolar decoupled MAS, and 13C refocused insensitive nuclei enhanced by polarization transfer (r-INEPT) NMR, were used to characterize the PU-SF coating sponge. Especially the 13C r-INEPT NMR spectrum of water-dispersed biodegradable PU showed that both main components of the non-crystalline domain of PU and amorphous domain of SF were highly mobile in the hydrated state. Then, the small-diameter SF artificial vascular grafts coated with this sponge were evaluated through implantation experiments with rats. The implanted PU-SF-coated SF grafts showed a high patency rate. It was confirmed that the inside of the SF grafts was covered with vascular endothelial cells 4 weeks after implantation. These results showed that the water-dispersed biodegradable PU-SF-coated SF graft created in this study could be a strong candidate for small-diameter artificial vascular graft.
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Affiliation(s)
- Takashi Tanaka
- Department of Veterinary Science, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan; (T.T.); (R.T.)
| | - Yusuke Ibe
- Polyurethane Research Laboratory, Tosoh Corporation, Mie 510-8540, Japan; (Y.I.); (T.J.)
| | - Takaki Jono
- Polyurethane Research Laboratory, Tosoh Corporation, Mie 510-8540, Japan; (Y.I.); (T.J.)
| | - Ryo Tanaka
- Department of Veterinary Science, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan; (T.T.); (R.T.)
| | - Akira Naito
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Tokyo 184-8588, Japan;
| | - Tetsuo Asakura
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Tokyo 184-8588, Japan;
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5
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Puerta M, Peresin MS, Restrepo-Osorio A. Effects of Chemical Post-treatments on Structural and Physicochemical Properties of Silk Fibroin Films Obtained From Silk Fibrous Waste. Front Bioeng Biotechnol 2020; 8:523949. [PMID: 33344426 PMCID: PMC7738614 DOI: 10.3389/fbioe.2020.523949] [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: 01/01/2020] [Accepted: 11/03/2020] [Indexed: 01/20/2023] Open
Abstract
Silk fibroin (SF) is a protein polymer claimed to have outstanding potential for medical applications. However, because of the manufacturing process, materials from regenerated SF exhibit a higher percentage of amorphous structures. The amorphous structures cause the material to be water soluble and can significantly limit its applications in wet biological environments. In order to increase the amount of crystalline structures and decrease the water solubility of SF materials, post-treatment with alcohols is usually employed. SF can be obtained from silk fibrous wastes (SFW), usually discarded in silk textile processes. This represents an opportunity to produce materials with high added value from low-cost natural sources. In this study, SF was obtained from SFW, and films were made thereof followed by a post-treatment by immersion or in a saturated atmosphere of methanol (MeOH) or ethanol (EtOH), using different exposure times. The resulting films were analyzed according to crystallinity, the percentage of crystalline and amorphous structures, and thermal stability. Also, water absorption and weight loss in aqueous media were determined. The results showed a significant increase in crystalline structures in all treated samples, varying according to the type and time of exposure to post-treatment conducted. The highest increase was shown in the case of the post-treatment by immersion in MeOH for 1 h, with a 23% increase over the untreated sample. This increase in crystallinity was reflected in an increase in the degradation temperature and a degradation rate of 5.3% on day 7. The possibility of tuning the degree of crystallinity, as well as thermal stability and aqueous integrity of thin films of SFW, can be applied to adjust these materials to the requirements of specific biomedical applications.
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Affiliation(s)
- Melissa Puerta
- Grupo de Investigación Sobre Nuevos Materiales, Universidad Pontificia Bolivariana, Medellín, Colombia
| | - Maria S. Peresin
- Forest Products Development Center, School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL, United States
| | - Adriana Restrepo-Osorio
- Grupo de Investigación Sobre Nuevos Materiales, Universidad Pontificia Bolivariana, Medellín, Colombia
- Facultad de Ingeniería Textil, Escuela de Ingenierías, Universidad Pontificia Bolivariana, Medellín, Colombia
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6
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Zhang T, Du L, Zhao J, Ding J, Zhang P, Wang L, Xu B. Biomimetic angle-ply multi-lamellar scaffold for annulus fibrosus tissue engineering. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2020; 31:67. [PMID: 32705351 DOI: 10.1007/s10856-020-06404-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Revised: 05/21/2020] [Accepted: 07/12/2020] [Indexed: 06/11/2023]
Abstract
Constructing a biomimetic scaffold that replicates the complex architecture of intervertebral disc annulus fibrosus (AF) remains a major goal in AF tissue engineering. In this study, a biomimetic angle-ply multi-lamellar polycaprolactone/silk fibroin (PCL/SF) AF scaffold was fabricated. Wet-spinning was used to obtain aligned PCL/SF microfiber sheets, and these were excised into strips with microfibers aligned at +30° or -30° relative to the strip long axis. This was followed by stacking two strips with opposing fiber alignment and wrapping them concentrically around a mandrel. Our results demonstrated that the scaffold possessed spatial structure and mechanical properties comparable to natural AF. The scaffold supported rabbit AF cells adhesion, proliferation, infiltration and guided oriented growth and extracellular matrix deposition. In conclusion, our angle-ply multi-lamellar scaffold offers a potential solution for AF replacement therapy and warrants further attention in future investigations.
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Affiliation(s)
- Tongxing Zhang
- Tianjin Medical University, Tianjin, PR China
- Department of Spine Surgery, Tianjin Hospital, Tianjin, PR China
| | - Lilong Du
- Tianjin Medical University, Tianjin, PR China
- Department of Spine Surgery, Tianjin Hospital, Tianjin, PR China
| | | | - Ji Ding
- Tianjin Medical University, Tianjin, PR China
- Department of Spine Surgery, Tianjin Hospital, Tianjin, PR China
| | - Peng Zhang
- Tianjin Medical University, Tianjin, PR China
| | - Lianyong Wang
- The Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, PR China
| | - Baoshan Xu
- Tianjin Medical University, Tianjin, PR China.
- Department of Spine Surgery, Tianjin Hospital, Tianjin, PR China.
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7
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Forouzideh N, Nadri S, Fattahi A, Abdolahinia ED, Habibizadeh M, Rostamizadeh K, Baradaran-Rafii A, Bakhshandeh H. Epigallocatechin gallate loaded electrospun silk fibroin scaffold with anti-angiogenic properties for corneal tissue engineering. J Drug Deliv Sci Technol 2020. [DOI: 10.1016/j.jddst.2020.101498] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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8
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Puerta M, Arango MC, Jaramillo-Quiceno N, Álvarez-López C, Restrepo-Osorio A. Influence of ethanol post-treatments on the properties of silk protein materials. SN APPLIED SCIENCES 2019. [DOI: 10.1007/s42452-019-1486-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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9
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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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Asakura T, Tanaka T, Tanaka R. Advanced Silk Fibroin Biomaterials and Application to Small-Diameter Silk Vascular Grafts. ACS Biomater Sci Eng 2019; 5:5561-5577. [PMID: 33405687 DOI: 10.1021/acsbiomaterials.8b01482] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
As the incidences of cardiovascular diseases have been on the rise in recent years, the need for small-diameter artificial vascular grafts is increasing globally. Although synthetic polymers such as expanded polytetrafluoroethylene or poly(ethylene terephthalate) have been successfully used for artificial vascular grafts ≥6 mm in diameter, they fail at smaller diameters (<6 mm) due to thrombus formation and intimal hyperplasia. Thus, development of vascular grafts for small diameter vessel replacement that are <6 mm in diameter remains a major clinical challenge. Silk fibroin (SF) from Bombyx mori silkworm is well-known as an excellent textile and also has been used as suture material in surgery for more than 2000 years. Many attempts to develop small-diameter SF vascular grafts with <6 mm in diameter have been reported. Here, research and development in small-diameter vascular grafts with SF are reviewed as follows: (1) the heterogeneous structure of SF fiber (Silk II), including the packing arrangements and type II β-turn structure of SF (Silk I*) before spinning; (2) SF modified by transgenic silkworm, which is more suitable for vascular grafts; (3) preparation of small-diameter SF vascular grafts; (4) characterization of SF in the hydrated state, including dynamics of water molecules by nuclear magnetic resonance; and (5) evaluation of the SF grafts by in vivo implantation experiment. According to the findings, SF is a promising material for small-diameter vascular graft development.
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Affiliation(s)
- Tetsuo Asakura
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Takashi Tanaka
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Ryo Tanaka
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
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Khosravi A, Ghasemi-Mobarakeh L, Mollahosseini H, Ajalloueian F, Masoudi Rad M, Norouzi MR, Sami Jokandan M, Khoddami A, Chronakis IS. Immobilization of silk fibroin on the surface of PCL nanofibrous scaffolds for tissue engineering applications. J Appl Polym Sci 2018. [DOI: 10.1002/app.46684] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Alireza Khosravi
- Department of Textile Engineering; Isfahan University of Technology; Isfahan 84156-83111 Iran
| | - Laleh Ghasemi-Mobarakeh
- Department of Textile Engineering; Isfahan University of Technology; Isfahan 84156-83111 Iran
| | - Hossein Mollahosseini
- Department of Textile Engineering; Isfahan University of Technology; Isfahan 84156-83111 Iran
| | - Fatemeh Ajalloueian
- Nano-BioScience Research Group; DTU-Food, Technical University of Denmark, Kemitorvet B202; 2800 Kgs, Lyngby Denmark
| | - Maryam Masoudi Rad
- Department of Chemical Engineering; Isfahan University of Technology; Isfahan 84156-83111 Iran
| | - Mohammad-Reza Norouzi
- Department of Textile Engineering; Isfahan University of Technology; Isfahan 84156-83111 Iran
| | - Maryam Sami Jokandan
- Nano-BioScience Research Group; DTU-Food, Technical University of Denmark, Kemitorvet B202; 2800 Kgs, Lyngby Denmark
| | - Akbar Khoddami
- Department of Textile Engineering; Isfahan University of Technology; Isfahan 84156-83111 Iran
| | - Ioannis S. Chronakis
- Nano-BioScience Research Group; DTU-Food, Technical University of Denmark, Kemitorvet B202; 2800 Kgs, Lyngby Denmark
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12
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Humenik M, Lang G, Scheibel T. Silk nanofibril self-assembly versus electrospinning. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2018; 10:e1509. [PMID: 29393590 DOI: 10.1002/wnan.1509] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 10/18/2017] [Accepted: 12/19/2017] [Indexed: 01/16/2023]
Abstract
Natural silk fibers represent one of the most advanced blueprints for (bio)polymer scientists, displaying highly optimized mechanical properties due to their hierarchical structures. Biotechnological production of silk proteins and implementation of advanced processing methods enabled harnessing the potential of these biopolymer not just based on the mechanical properties. In addition to fibers, diverse morphologies can be produced, such as nonwoven meshes, films, hydrogels, foams, capsules and particles. Among them, nanoscale fibrils and fibers are particularly interesting concerning medical and technical applications due to their biocompatibility, environmental and mechanical robustness as well as high surface-to-volume ratio. Therefore, we introduce here self-assembly of silk proteins into hierarchically organized structures such as supramolecular nanofibrils and fabricated materials based thereon. As an alternative to self-assembly, we also present electrospinning a technique to produce nanofibers and nanofibrous mats. Accordingly, we introduce a broad range of silk-based dopes, used in self-assembly and electrospinning: natural silk proteins originating from natural spinning glands, natural silk protein solutions reconstituted from fibers, engineered recombinant silk proteins designed from natural blueprints, genetic fusions of recombinant silk proteins with other structural or functional peptides and moieties, as well as hybrids of recombinant silk proteins chemically conjugated with nonproteinaceous biotic or abiotic molecules. We highlight the advantages but also point out drawbacks of each particular production route. The scope includes studies of the natural self-assembly mechanism during natural silk spinning, production of silk fibrils as new nanostructured non-native scaffolds allowing dynamic morphological switches, as well as studying potential applications. This article is categorized under: Biology-Inspired Nanomaterials > Peptide-Based Structures Nanotechnology Approaches to Biology > Nanoscale Systems in Biology Biology-Inspired Nanomaterials > Protein and Virus-Based Structures.
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Affiliation(s)
- Martin Humenik
- Biomaterials, Faculty of Engineering Science, University of Bayreuth, Bayreuth, Germany
| | - Gregor Lang
- Biomaterials, Faculty of Engineering Science, University of Bayreuth, Bayreuth, Germany
| | - Thomas Scheibel
- Biomaterials, Faculty of Engineering Science, University of Bayreuth, Bayreuth, Germany.,Bayreuth Center for Colloids and Interfaces (BZKG), Research Center Bio-Macromolecules (BIOmac), Bayreuth Center for Molecular Biosciences (BZMB), Bayreuth Center for Material Science (BayMAT), Bavarian Polymer Institute (BPI), Universität Bayreuth, Bayreuth, Germany
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13
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Madhavan K, Frid MG, Hunter K, Shandas R, Stenmark KR, Park D. Development of an electrospun biomimetic polyurea scaffold suitable for vascular grafting. J Biomed Mater Res B Appl Biomater 2018; 106:278-290. [PMID: 28130878 PMCID: PMC6080858 DOI: 10.1002/jbm.b.33853] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Revised: 11/15/2016] [Accepted: 01/01/2017] [Indexed: 12/19/2022]
Abstract
The optimization of biomechanical and biochemical properties of a vascular graft to render properties relevant to physiological environments is a major challenge today. These critical properties of a vascular graft not only regulate its stability and integrity, but also control invasion of cells for scaffold remodeling permitting its integration with native tissue. In this work, we have synthesized a biomimetic scaffold by electrospinning a blend of a polyurea, poly(serinol hexamethylene urea) (PSHU), and, a polyester, poly-ε-caprolactone (PCL). Mechanical properties of the scaffold were varied by varying polymer blending ratio and electrospinning flow rate. Mechanical characterization revealed that scaffolds with lower PSHU content relative to PCL content resulted in elasticity close to native mammalian arteries. We also found that increasing electrospinning flow rates also increased the elasticity of the matrix. Optimization of elasticity generated scaffolds that enabled vascular smooth muscle cells (SMCs) to adhere, grow and maintain a SMC phenotype. The 30/70 scaffold also underwent slower degradation than scaffolds with higher PSHU content, thereby, providing the best option for in vivo remodeling. Further, Gly-Arg-Gly-Asp-Ser (RGD) covalently conjugated to the polyurea backbone in 30/70 scaffold resulted in significantly increased clotting times. Reducing surface thrombogenicity by the conjugation of RGD is critical to avoiding intimal hyperplasia. Hence, biomechanical and biochemical properties of a vascular graft can be balanced by optimizing synthesis parameters and constituent components. For these reasons, the optimized RGD-conjugated 30/70 scaffold electrospun at 2.5 or 5 mL/h has great potential as a suitable material for vascular grafting applications. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 278-290, 2018.
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Affiliation(s)
- Krishna Madhavan
- Department of Bioengineering, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, 80045, USA
- Cardiovascular Pulmonary Group, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, 80045, USA
| | - Maria G. Frid
- Department of Pediatrics, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, 80045, USA
- Cardiovascular Pulmonary Group, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, 80045, USA
| | - Kendall Hunter
- Department of Bioengineering, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, 80045, USA
- Cardiovascular Pulmonary Group, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, 80045, USA
| | - Robin Shandas
- Department of Bioengineering, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, 80045, USA
- Department of Pediatrics, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, 80045, USA
- Department of Surgery, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, 80045, USA
- Cardiovascular Pulmonary Group, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, 80045, USA
| | - Kurt R. Stenmark
- Department of Pediatrics, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, 80045, USA
- Cardiovascular Pulmonary Group, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, 80045, USA
| | - Daewon Park
- Department of Bioengineering, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, 80045, USA
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14
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Baudequin T, Gaut L, Mueller M, Huepkes A, Glasmacher B, Duprez D, Bedoui F, Legallais C. The Osteogenic and Tenogenic Differentiation Potential of C3H10T1/2 (Mesenchymal Stem Cell Model) Cultured on PCL/PLA Electrospun Scaffolds in the Absence of Specific Differentiation Medium. MATERIALS 2017; 10:ma10121387. [PMID: 29207566 PMCID: PMC5744322 DOI: 10.3390/ma10121387] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 11/27/2017] [Accepted: 11/29/2017] [Indexed: 12/21/2022]
Abstract
The differentiation potential of mesenchymal stem cells (MSC) has been extensively tested on electrospun scaffolds. However, this potential is often assessed with lineage-specific medium, making it difficult to interpret the real contribution of the properties of the scaffold in the cell response. In this study, we analyzed the ability of different polycaprolactone/polylactic acid PCL/PLA electrospun scaffolds (pure or blended compositions, random or aligned fibers, various fiber diameters) to drive MSC towards bone or tendon lineages in the absence of specific differentiation medium. C3H10T1/2 cells (a mesenchymal stem cell model) were cultured on scaffolds for 96 h without differentiation factors. We performed a cross-analysis of the cell–scaffold interactions (spreading, organization, and specific gene expression) with mechanical (elasticity), morphological (porosity, fibers diameter and orientation) and surface (wettability) characterizations of the electrospun fibers. We concluded that (1) osteogenic differentiation can be initiated on pure PCL-based electrospun scaffolds without specific culture conditions; (2) fiber alignment modified cell organization in the short term and (3) PLA added to PCL with an increased fiber diameter encouraged the stem cells towards the tendon lineage without additional tenogenic factors. In summary, the differentiation potential of stem cells on adapted electrospun fibers could be achieved in factor-free medium, making possible future applications in clinically relevant situations.
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Affiliation(s)
- Timothée Baudequin
- CNRS, UMR 7338 Biomechanics and Bioengineering, Sorbonne Universités, Université de Technologie de Compiègne, 60200 Compiègne, France.
| | - Ludovic Gaut
- CNRS UMR 7622 IBPS-Developmental Biology Laboratory, Sorbonne Universités, UPMC Univ Paris 06, F-75005 Paris, France.
- Inserm U1156, F-75005 Paris, France.
| | - Marc Mueller
- Institute for Multiphase Processes, Leibniz Universität Hanover, D-30167 Hanover, Germany.
| | - Angela Huepkes
- CNRS, UMR 7338 Biomechanics and Bioengineering, Sorbonne Universités, Université de Technologie de Compiègne, 60200 Compiègne, France.
- Institute for Multiphase Processes, Leibniz Universität Hanover, D-30167 Hanover, Germany.
| | - Birgit Glasmacher
- Institute for Multiphase Processes, Leibniz Universität Hanover, D-30167 Hanover, Germany.
| | - Delphine Duprez
- CNRS UMR 7622 IBPS-Developmental Biology Laboratory, Sorbonne Universités, UPMC Univ Paris 06, F-75005 Paris, France.
- Inserm U1156, F-75005 Paris, France.
| | - Fahmi Bedoui
- CNRS, UMR 7337 Roberval Laboratory for Mechanics, Sorbonne Universités, Université de Technologie de Compiègne, 60200 Compiègne, France.
| | - Cécile Legallais
- CNRS, UMR 7338 Biomechanics and Bioengineering, Sorbonne Universités, Université de Technologie de Compiègne, 60200 Compiègne, France.
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15
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Aligned ovine diaphragmatic myoblasts overexpressing human connexin-43 seeded on poly (L-lactic acid) scaffolds for potential use in cardiac regeneration. Cytotechnology 2017; 70:651-664. [PMID: 29143226 DOI: 10.1007/s10616-017-0166-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Accepted: 11/01/2017] [Indexed: 12/13/2022] Open
Abstract
Diaphragmatic myoblasts (DMs) are precursors of type-1 muscle cells displaying high exhaustion threshold on account that they contract and relax 20 times/min over a lifespan, making them potentially useful in cardiac regeneration strategies. Besides, it has been shown that biomaterials for stem cell delivery improve cell retention and viability in the target organ. In the present study, we aimed at developing a novel approach based on the use of poly (L-lactic acid) (PLLA) scaffolds seeded with DMs overexpressing connexin-43 (cx43), a gap junction protein that promotes inter-cell connectivity. DMs isolated from ovine diaphragm biopsies were characterized by immunohistochemistry and ability to differentiate into myotubes (MTs) and transduced with a lentiviral vector encoding cx43. After confirming cx43 expression (RT-qPCR and Western blot) and its effect on inter-cell connectivity (fluorescence recovery after photobleaching), DMs were grown on fiber-aligned or random PLLA scaffolds. DMs were successfully isolated and characterized. Cx43 mRNA and protein were overexpressed and favored inter-cell connectivity. Alignment of the scaffold fibers not only aligned but also elongated the cells, increasing the contact surface between them. This novel approach is feasible and combines the advantages of bioresorbable scaffolds as delivery method and a cell type that on account of its features may be suitable for cardiac regeneration. Future studies on animal models of myocardial infarction are needed to establish its usefulness on scar reduction and cardiac function.
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16
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Tightening slip knots in raw and degummed silk to increase toughness without losing strength. Sci Rep 2016; 6:18222. [PMID: 26868855 PMCID: PMC4751510 DOI: 10.1038/srep18222] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Accepted: 11/04/2015] [Indexed: 11/13/2022] Open
Abstract
Knots are fascinating topological elements, which can be found in both natural and artificial systems. While in most of the cases, knots cannot be loosened without breaking the strand where they are tightened, herein, attention is focused on slip or running knots, which on the contrary can be unfastened without compromising the structural integrity of their hosting material. Two different topologies are considered, involving opposite unfastening mechanisms, and their influence on the mechanical properties of natural fibers, as silkworm silk raw and degummed single fibers, is investigated and quantified. Slip knots with optimized shape and size result in a significant enhancement of fibers energy dissipation capability, up to 300–400%, without affecting their load bearing capacity.
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17
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Berardo A, Pantano MF, Pugno NM. Slip knots and unfastening topologies enhance toughness without reducing strength of silk fibroin fibres. Interface Focus 2016; 6:20150060. [PMID: 26855750 DOI: 10.1098/rsfs.2015.0060] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The combination of high strength and high toughness is a desirable feature that structural materials should display. However, while in the past, engineers had to compromise on either strength or toughness depending on the requested application, nowadays, new toughening strategies are available to provide strong materials with high toughness. In this paper, we focus on one of such strategy, which requires no chemical treatment, but the implementation of slip knots with optimized shape and size in the involved material, which is silkworm silk in this case. In particular, a variety of slip knot topologies with different unfastening mechanisms are investigated, including even complex knots usually used in the textile industry, and their efficiency in enhancing toughness of silk fibres is discussed.
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Affiliation(s)
- Alice Berardo
- Laboratory of Bio-inspired and Graphene Nanomechanics, Department of Civil, Environmental and Mechanical Engineering , University of Trento , Via Mesiano 77, 38123 Trento , Italy
| | - Maria F Pantano
- Laboratory of Bio-inspired and Graphene Nanomechanics, Department of Civil, Environmental and Mechanical Engineering , University of Trento , Via Mesiano 77, 38123 Trento , Italy
| | - Nicola M Pugno
- Laboratory of Bio-inspired and Graphene Nanomechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento, Via Mesiano 77, 38123 Trento, Italy; Center for Materials and Microsystems, Fondazione Bruno Kessler, Via Sommarive 18, 38123 Povo, TN, Italy; School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK
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18
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Floren M, Bonani W, Dharmarajan A, Motta A, Migliaresi C, Tan W. Human mesenchymal stem cells cultured on silk hydrogels with variable stiffness and growth factor differentiate into mature smooth muscle cell phenotype. Acta Biomater 2016; 31:156-166. [PMID: 26621695 PMCID: PMC4728007 DOI: 10.1016/j.actbio.2015.11.051] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Revised: 11/04/2015] [Accepted: 11/23/2015] [Indexed: 12/22/2022]
Abstract
Cell-matrix and cell-biomolecule interactions play critical roles in a diversity of biological events including cell adhesion, growth, differentiation, and apoptosis. Evidence suggests that a concise crosstalk of these environmental factors may be required to direct stem cell differentiation toward matured cell type and function. However, the culmination of these complex interactions to direct stem cells into highly specific phenotypes in vitro is still widely unknown, particularly in the context of implantable biomaterials. In this study, we utilized tunable hydrogels based on a simple high pressure CO2 method and silk fibroin (SF) the structural protein of Bombyx mori silk fibers. Modification of SF protein starting water solution concentration results in hydrogels of variable stiffness while retaining key structural parameters such as matrix pore size and β-sheet crystallinity. To further resolve the complex crosstalk of chemical signals with matrix properties, we chose to investigate the role of 3D hydrogel stiffness and transforming growth factor (TGF-β1), with the aim of correlating the effects on the vascular commitment of human mesenchymal stem cells. Our data revealed the potential to upregulate matured vascular smooth muscle cell phenotype (myosin heavy chain expression) of hMSCs by employing appropriate matrix stiffness and growth factor (within 72h). Overall, our observations suggest that chemical and physical stimuli within the cellular microenvironment are tightly coupled systems involved in the fate decisions of hMSCs. The production of tunable scaffold materials that are biocompatible and further specialized to mimic tissue-specific niche environments will be of considerable value to future tissue engineering platforms. STATEMENT OF SIGNIFICANCE This article investigates the role of silk fibroin hydrogel stiffness and transforming growth factor (TGF-β1), with the aim of correlating the effects on the vascular commitment of human mesenchymal stem cells. Specifically, we demonstrate the upregulation of mature vascular smooth muscle cell phenotype (myosin heavy chain expression) of hMSCs by employing appropriate matrix stiffness and growth factor (within 72h). Moreover, we demonstrate the potential to direct specialized hMSC differentiation by modulating stiffness and growth factor using silk fibroin, a well-tolerated and -defined biomaterial with an impressive portfolio of tissue engineering applications. Altogether, our study reinforce the fact that complex differentiation protocols may be simplified by engineering the cellular microenvironment on multiple scales, i.e. matrix stiffness with growth factor.
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Affiliation(s)
- Michael Floren
- Department of Mechanical Engineering, University of Colorado Boulder, Boulder, CO 80309, USA; Department of Industrial Engineering and Biotech Research Center, University of Trento, via Sommarive 9, 38123 Trento, Italy
| | - Walter Bonani
- Department of Industrial Engineering and Biotech Research Center, University of Trento, via Sommarive 9, 38123 Trento, Italy
| | - Anirudh Dharmarajan
- Department of Mechanical Engineering, University of Colorado Boulder, Boulder, CO 80309, USA
| | - Antonella Motta
- Department of Industrial Engineering and Biotech Research Center, University of Trento, via Sommarive 9, 38123 Trento, Italy
| | - Claudio Migliaresi
- Department of Industrial Engineering and Biotech Research Center, University of Trento, via Sommarive 9, 38123 Trento, Italy
| | - Wei Tan
- Department of Mechanical Engineering, University of Colorado Boulder, Boulder, CO 80309, USA.
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19
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Benetti EM, Gunnewiek MK, van Blitterswijk CA, Julius Vancso G, Moroni L. Mimicking natural cell environments: design, fabrication and application of bio-chemical gradients on polymeric biomaterial substrates. J Mater Chem B 2016; 4:4244-4257. [DOI: 10.1039/c6tb00947f] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Gradients of biomolecules on synthetic, solid substrates can efficiently mimic the natural, graded variation of properties of the extracellular matrix (ECM).
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Affiliation(s)
- Edmondo M. Benetti
- Department of Materials Science and Technology of Polymers
- MESA+ Institute for Nanotechnology
- University of Twente
- 7500 AE Enschede
- The Netherlands
| | - Michel Klein Gunnewiek
- Department of Materials Science and Technology of Polymers
- MESA+ Institute for Nanotechnology
- University of Twente
- 7500 AE Enschede
- The Netherlands
| | - Clemens A. van Blitterswijk
- Department of Complex Tissue Regeneration
- MERLN Institute for Technology Inspired Regenerative Medicine
- Maastricht University
- 6200 MD Maastricht
- The Netherlands
| | - G. Julius Vancso
- Department of Materials Science and Technology of Polymers
- MESA+ Institute for Nanotechnology
- University of Twente
- 7500 AE Enschede
- The Netherlands
| | - Lorenzo Moroni
- Department of Complex Tissue Regeneration
- MERLN Institute for Technology Inspired Regenerative Medicine
- Maastricht University
- 6200 MD Maastricht
- The Netherlands
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20
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Singh C, Wong CS, Wang X. Medical Textiles as Vascular Implants and Their Success to Mimic Natural Arteries. J Funct Biomater 2015; 6:500-25. [PMID: 26133386 PMCID: PMC4598668 DOI: 10.3390/jfb6030500] [Citation(s) in RCA: 114] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2015] [Revised: 06/18/2015] [Accepted: 06/18/2015] [Indexed: 02/06/2023] Open
Abstract
Vascular implants belong to a specialised class of medical textiles. The basic purpose of a vascular implant (graft and stent) is to act as an artificial conduit or substitute for a diseased artery. However, the long-term healing function depends on its ability to mimic the mechanical and biological behaviour of the artery. This requires a thorough understanding of the structure and function of an artery, which can then be translated into a synthetic structure based on the capabilities of the manufacturing method utilised. Common textile manufacturing techniques, such as weaving, knitting, braiding, and electrospinning, are frequently used to design vascular implants for research and commercial purposes for the past decades. However, the ability to match attributes of a vascular substitute to those of a native artery still remains a challenge. The synthetic implants have been found to cause disturbance in biological, biomechanical, and hemodynamic parameters at the implant site, which has been widely attributed to their structural design. In this work, we reviewed the design aspect of textile vascular implants and compared them to the structure of a natural artery as a basis for assessing the level of success as an implant. The outcome of this work is expected to encourage future design strategies for developing improved long lasting vascular implants.
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Affiliation(s)
- Charanpreet Singh
- Australian Future Fibres Research and Innovation Centre, Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia.
| | - Cynthia S Wong
- Australian Future Fibres Research and Innovation Centre, Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia.
| | - Xungai Wang
- Australian Future Fibres Research and Innovation Centre, Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia.
- School of Textile Science and Engineering, Wuhan Textile University, Wuhan 430073, China.
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21
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Effect of random/aligned nylon-6/MWCNT fibers on dental resin composite reinforcement. J Mech Behav Biomed Mater 2015; 48:134-144. [PMID: 25933169 DOI: 10.1016/j.jmbbm.2015.03.019] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 03/22/2015] [Accepted: 03/23/2015] [Indexed: 11/24/2022]
Abstract
The aims of this study were (1) to synthesize and characterize random and aligned nanocomposite fibers of multi-walled carbon nanotubes (MWCNT)/nylon-6 and (2) to determine their reinforcing effects on the flexural strength of a dental resin composite. Nylon-6 was dissolved in hexafluoropropanol (10 wt%), followed by the addition of MWCNT (hereafter referred to as nanotubes) at two distinct concentrations (i.e., 0.5 or 1.5 wt%). Neat nylon-6 fibers (without nanotubes) were also prepared. The solutions were electrospun using parameters under low- (120 rpm) or high-speed (6000 rpm) mandrel rotation to collect random and aligned fibers, respectively. The processed fiber mats were characterized by scanning (SEM) and transmission (TEM) electron microscopies, as well as by uni-axial tensile testing. To determine the reinforcing effects on the flexural strength of a dental resin composite, bar-shaped (20×2×2 mm(3)) resin composite specimens were prepared by first placing one increment of the composite, followed by one strip of the mat, and one last increment of composite. Non-reinforced composite specimens were used as the control. The specimens were then evaluated using flexural strength testing. SEM was done on the fractured surfaces. The data were analyzed using ANOVA and the Tukey׳s test (α=5%). Nanotubes were successfully incorporated into the nylon-6 fibers. Aligned and random fibers were obtained using high- and low-speed electrospinning, respectively, where the former were significantly (p<0.001) stronger than the latter, regardless of the nanotubes׳ presence. Indeed, the dental resin composite tested was significantly reinforced when combined with nylon-6 fibrous mats composed of aligned fibers (with or without nanotubes) or random fibers incorporated with nanotubes at 0.5 wt%.
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22
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Al Kayal T, Maniglio D, Bonani W, Losi P, Migliaresi C, Soldani G. A combined method for bilayered vascular graft fabrication. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2015; 26:96. [PMID: 25652773 DOI: 10.1007/s10856-015-5458-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Accepted: 12/22/2014] [Indexed: 06/04/2023]
Abstract
Autologous saphenous vein is still the conduit of choice for peripheral by-pass. Synthetic vascular grafts in polyethylene terephthalate and expanded polytetrafluoroethylene are used if vein access cannot be obtained. However they are successfully used to replace large diameter vessels, but they fail in small diameters (<6 mm). In the present study a bilayered synthetic vascular graft was developed. The graft was composed of an inner nanofibrous layer obtained by electrospinning able to host endothelial cells and a highly porous external layer obtained by spray, phase-inversion technique capable to sustain tunica media regeneration. Graft morphology and thickness, fiber size, pore size and layer adhesion strength were assessed. The innovative combination of two different consolidated techniques allowed to manufacture a nanostructured composite graft featuring a homogeneous microporous layer firmly attached on the top of the electrospun layer. By tuning the mechanical properties and the porosity of vascular prostheses, it will be possible to optimize the graft for in situ tissue regeneration while preventing blood leakage.
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Affiliation(s)
- Tamer Al Kayal
- Institute of Clinical Physiology, National Research Council, Via Aurelia Sud, 54100, Massa, Italy,
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23
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Sheikh FA, Ju HW, Moon BM, Park HJ, Kim JH, Kim SH, Lee OJ, Park CH. A comparative mechanical and biocompatibility study of poly(ε-caprolactone), hybrid poly(ε-caprolactone)–silk, and silk nanofibers by colloidal electrospinning technique for tissue engineering. J BIOACT COMPAT POL 2014. [DOI: 10.1177/0883911514549717] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Poly(ε-caprolactone) is an established polymer used in the fabrication of scaffolds for tissue engineering applications. Poly(ε-caprolactone)’s intrinsic hydrophobicity and toxicity, however, is greater than other natural polymers which limits its applicability. In this study, these problems were addressed by the modification of poly(ε-caprolactone) nanofibers with nanoparticles made from natural polymers, such as silk fibroin. Silk fibroin nanoparticles were prepared by desolvation and blended with poly(ε-caprolactone) to form a colloidal solution capable of forming nanofibers by electrospinning. Fabricated silk fibroin nanoparticles and three different nanofibers were characterized by transmission electron microscopy, variable pressure field emission scanning electron microscope, contact angle, Fourier transform infrared spectroscopy, thermogravimetric analysis, as well as an evaluation of their mechanical properties. The hybrid nanofibers incorporated with silk nanoparticles improved water absorbability compared to pure poly(ε-caprolactone) nanofibers and had much better mechanical properties than the silk fibroin nanofibers. The cytotoxicity and cell attachment tests were carried by culturing NIH 3T3 fibroblasts with the nanofibers. The hybrid nanofibers exhibited better cell viability and cell attachment than the pure poly(ε-caprolactone) nanofibers. Furthermore, the silk fibroin nanoparticles improved the water contact angle and enhanced cell interaction compared to the unmodified poly(ε-caprolactone). Based on these results, the modification of poly(ε-caprolactone) nanofibers with silk nanoparticles is a promising strategy for the improvement of poly(ε-caprolactone)-based nanofibers for future tissue engineering applications.
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Affiliation(s)
- Faheem A Sheikh
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, Chuncheon, South Korea
| | - Hyung Woo Ju
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, Chuncheon, South Korea
| | - Bo Mi Moon
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, Chuncheon, South Korea
| | - Hyun Jung Park
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, Chuncheon, South Korea
| | - Jung-Ho Kim
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, Chuncheon, South Korea
| | - Soo Hyeon Kim
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, Chuncheon, South Korea
| | - Ok Joo Lee
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, Chuncheon, South Korea
| | - Chan Hum Park
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, Chuncheon, South Korea
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, Hallym University, Chuncheon, South Korea
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24
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Guarino V, Cirillo V, Altobelli R, Ambrosio L. Polymer-based platforms by electric field-assisted techniques for tissue engineering and cancer therapy. Expert Rev Med Devices 2014; 12:113-29. [DOI: 10.1586/17434440.2014.953058] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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25
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Zhou M, Qiao W, Liu Z, Shang T, Qiao T, Mao C, Liu C. Development and in vivo evaluation of small-diameter vascular grafts engineered by outgrowth endothelial cells and electrospun chitosan/poly(ε-caprolactone) nanofibrous scaffolds. Tissue Eng Part A 2013; 20:79-91. [PMID: 23902162 DOI: 10.1089/ten.tea.2013.0020] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Successful engineering of a small-diameter vascular graft is still a challenge despite numerous attempts for decades. The present study aimed at developing a tissue-engineered vascular graft (TEVG) using autologous outgrowth endothelial cells (OECs) and a hybrid biodegradable polymer scaffold. OECs were harvested from canine peripheral blood and proliferated in vitro, as well as identified by immunofluorescent staining. Electrospun hybrid chitosan/poly(ε-caprolactone) (CS/PCL) nanofibers were fabricated and served as vascular scaffolds. TEVGs were constructed in vitro by seeding OECs onto CS/PCL scaffolds, and then implanted into carotid arteries of cell-donor dogs (n=6). After 3 months of implantation, 5 out of 6 of TEVGs remained patent as compared with 1 out of 6 of unseeded grafts kept patent. Histological and immunohistochemical analyses of the TEVGs retrieved at 3 months revealed the regeneration of endothelium, and the presence of collagen and elastin. OECs labeled with fluorescent dye before implantation were detected in the retrieved TEVGs, indicating that the OECs participated in the vascular tissue regeneration. Biomechanical testing of TEVGs showed good mechanical properties that were closer to native carotid arteries. RT-PCR and western blot analysis demonstrated that TEVGs had favorable biological functional properties resembling native arteries. Overall, this study provided a new strategy to develop small-diameter TEVGs with excellent biocompatibility and regeneration ability.
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Affiliation(s)
- Min Zhou
- 1 Department of Vascular Surgery, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School , Nanjing, P.R. China
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26
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Lavielle N, Hébraud A, Schlatter G, Thöny-Meyer L, Rossi RM, Popa AM. Simultaneous electrospinning and electrospraying: a straightforward approach for fabricating hierarchically structured composite membranes. ACS APPLIED MATERIALS & INTERFACES 2013; 5:10090-10097. [PMID: 24099219 DOI: 10.1021/am402676m] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We present here for the first time a simple method for micropatterning nonwoven composite membranes. The approach is based on the simultaneous electrospraying of microparticles and electrospinning of nanofibers from different polymer solution feeds (polyethylene glycol and poly(D,L-lactide)) on a common support. The mechanism of self-organization between fibers and particles into hierarchical honeycomb-like structures, as well as the evolution of the later as a function of the thickness of the composite, is investigated. We demonstrate that aggregates of particles, leading to a nonuniform distribution of the electrostatic field near the collector, are necessary to form the self-organized composite. Furthermore, it is shown that the specific dimensions of the generated patterns can be controlled by tuning the flow rate of electrospraying. The obtained composite mat exhibits a multilevel porous structure, with pore sizes ranging from few up to several hundreds of micrometers. Finally, it is shown that the microparticles can be selectively leached, allowing the production of a monocomponent membrane and retaining the hierarchical organization of the nanofibers suitable for biomedical and filtration applications.
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Affiliation(s)
- Nicolas Lavielle
- Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé, ICPEES-UMR7515, Université de Strasbourg , CNRS, Institut Carnot MICA, Ecole Européenne de Chimie, Polymères et Matériaux, 25 rue Becquerel, 67087 Strasbourg, cedex 2, France
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Ingavle GC, Leach JK. Advancements in electrospinning of polymeric nanofibrous scaffolds for tissue engineering. TISSUE ENGINEERING PART B-REVIEWS 2013; 20:277-93. [PMID: 24004443 DOI: 10.1089/ten.teb.2013.0276] [Citation(s) in RCA: 145] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Polymeric nanofibers have potential as tissue engineering scaffolds, as they mimic the nanoscale properties and structural characteristics of native extracellular matrix (ECM). Nanofibers composed of natural and synthetic polymers, biomimetic composites, ceramics, and metals have been fabricated by electrospinning for various tissue engineering applications. The inherent advantages of electrospinning nanofibers include the generation of substrata with high surface area-to-volume ratios, the capacity to precisely control material and mechanical properties, and a tendency for cellular in-growth due to interconnectivity within the pores. Furthermore, the electrospinning process affords the opportunity to engineer scaffolds with micro- to nanoscale topography similar to the natural ECM. This review describes the fundamental aspects of the electrospinning process when applied to spinnable natural and synthetic polymers; particularly, those parameters that influence fiber geometry, morphology, mesh porosity, and scaffold mechanical properties. We describe cellular responses to fiber morphology achieved by varying processing parameters and highlight successful applications of electrospun nanofibrous scaffolds when used to tissue engineer bone, skin, and vascular grafts.
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Affiliation(s)
- Ganesh C Ingavle
- 1 Department of Biomedical Engineering, University of California Davis , Davis, California
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Pérez-Ramírez Ú, López-Orive JJ, Arana E, Salmerón-Sánchez M, Moratal D. Micro-computed tomography image-based evaluation of 3D anisotropy degree of polymer scaffolds. Comput Methods Biomech Biomed Engin 2013; 18:446-55. [DOI: 10.1080/10255842.2013.818663] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Wong CS, Liu X, Xu Z, Lin T, Wang X. Elastin and collagen enhances electrospun aligned polyurethane as scaffolds for vascular graft. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2013; 24:1865-1874. [PMID: 23625321 DOI: 10.1007/s10856-013-4937-y] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Accepted: 04/19/2013] [Indexed: 06/02/2023]
Abstract
Mismatch in mechanical properties between synthetic vascular graft and arteries contribute to graft failure. The viscoelastic properties of arteries are conferred by elastin and collagen. In this study, the mechanical properties and cellular interactions of aligned nanofibrous polyurethane (PU) scaffolds blended with elastin, collagen or a mixture of both proteins were examined. Elastin softened PU to a peak stress and strain of 7.86 MPa and 112.28 % respectively, which are similar to those observed in blood vessels. Collagen-blended PU increased in peak stress to 28.14 MPa. The growth of smooth muscle cells (SMCs) on both collagen-blended and elastin/collagen-blended scaffold increased by 283 and 224 % respectively when compared to PU. Smooth muscle myosin staining indicated that the cells are contractile SMCs which are favored in vascular tissue engineering. Elastin and collagen are beneficial for creating compliant synthetic vascular grafts as elastin provided the necessary viscoelastic properties while collagen enhanced the cellular interactions.
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MESH Headings
- Blood Vessel Prosthesis
- Cell Proliferation/drug effects
- Cells, Cultured
- Coated Materials, Biocompatible/chemistry
- Coated Materials, Biocompatible/metabolism
- Collagen/metabolism
- Collagen/pharmacology
- Coronary Vessels/cytology
- Elastin/metabolism
- Elastin/pharmacology
- Electroplating/methods
- Humans
- Materials Testing
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/physiology
- Myocytes, Smooth Muscle/cytology
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/physiology
- Polyurethanes/chemistry
- Tissue Scaffolds/chemistry
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Affiliation(s)
- Cynthia S Wong
- Institute for Frontier Materials, Deakin University, Geelong, VIC, 3217, Australia.
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Ercolani E, Del Gaudio C, Bianco A. Vascular tissue engineering of small-diameter blood vessels: reviewing the electrospinning approach. J Tissue Eng Regen Med 2013; 9:861-88. [DOI: 10.1002/term.1697] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Revised: 10/08/2012] [Accepted: 12/20/2012] [Indexed: 11/07/2022]
Affiliation(s)
- Enrico Ercolani
- Department of Industrial Engineering, INSTM Research Unit Roma Tor Vergata; University of Rome ‘Tor Vergata’; Via del Politecnico 1 00133 Rome Italy
| | - Costantino Del Gaudio
- Department of Industrial Engineering, INSTM Research Unit Roma Tor Vergata; University of Rome ‘Tor Vergata’; Via del Politecnico 1 00133 Rome Italy
| | - Alessandra Bianco
- Department of Industrial Engineering, INSTM Research Unit Roma Tor Vergata; University of Rome ‘Tor Vergata’; Via del Politecnico 1 00133 Rome Italy
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Foss C, Merzari E, Migliaresi C, Motta A. Silk fibroin/hyaluronic acid 3D matrices for cartilage tissue engineering. Biomacromolecules 2012; 14:38-47. [PMID: 23134349 DOI: 10.1021/bm301174x] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
In spite of commercially available products, the complete and sustained repair of damaged articular cartilage still presents various challenges. Among biomaterials proposed for cartilage repair, silk fibroin (SF) has been recently proposed as a material template for porous scaffolds cultured with chondrocytes and investigated in static and dynamic conditions. In addition to fibroin-based constructs, literature has reported that the combination of hyaluronic acid (HA) with other scaffold materials can protect the chondral phenotype and the cells in vitro response to the scaffold. In this study, the effect of the addition of HA on the physical properties of SF sponges, with and without cross-linking with genipin, was investigated. Salt-leached scaffolds were characterized in terms of morphology and structural and physical properties, as well as mechanical performance. Un-cross-linked sponges resulted in the physical separation of highly hydrophilic HA from the SF, while cross-linking prevented this phenomenon, resulting in a homogeneous blend. The presence of HA also influenced fibroin crystallinity and tended to decrease the cross-linking degree of the scaffolds when compared to the pure SF material.
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Affiliation(s)
- Cristina Foss
- BIOtech, Department of Industrial Engineering, University of Trento, via delle Regole 101, 38123 Mattarello, Trento, Italy
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Madhavan K, Elliott WH, Bonani W, Monnet E, Tan W. Mechanical and biocompatible characterizations of a readily available multilayer vascular graft. J Biomed Mater Res B Appl Biomater 2012; 101:506-19. [PMID: 23165922 DOI: 10.1002/jbm.b.32851] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2012] [Revised: 07/31/2012] [Accepted: 09/25/2012] [Indexed: 01/24/2023]
Abstract
There is always a considerable clinical need for vascular grafts. Considering the availability, physical and mechanical properties, and regenerative potential, we have developed and characterized readily available, strong, and compliant multilayer grafts that support cell culture and ingrowth. The grafts were made from heterogeneous materials and structures, including a thin, dense, nanofibrous core composed of poly-ε-caprolactone (PCL), and a thick, porous, hydrogel sleeve composed of genipin-crosslinked collagen-chitosan (GCC). Because the difference in physicochemical properties between PCL and GCC caused layer separation, the layer adhesion was identified as a determinant to graft property and integrity under physiological conditions. Thus, strategies to modify the layer interface, including increasing porosity of the PCL surface, decreasing hydrophobicity, and increasing interlayer crosslinking, were developed. Results from microscopic images showed that increasing PCL porosity was characterized by improved layer adhesion. The resultant graft was characterized by high compliance (4.5%), and desired permeability (528 mL/cm(2)/min), burst strength (695 mmHg), and suture strength (2.38 N) for readily grafting. Results also showed that PCL mainly contributed to the graft mechanical properties, whereas GCC reduced the water permeability. In addition to their complementary contributions to physical and mechanical properties, the distinct graft layers also provided layer-specific structures for seeding and culture of vascular endothelial and smooth muscle cells in vitro. Acellular graft constructs were readily used to replace abdominal aorta of rabbits, resulting in rapid cell ingrowth and flow reperfusion. The multilayer constructs capable of sustaining physiological conditions and promoting cellular activities could serve as a platform for future development of regenerative vascular grafts.
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Affiliation(s)
- Krishna Madhavan
- Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, Colorado, USA
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Bonani W, Motta A, Migliaresi C, Tan W. Biomolecule gradient in micropatterned nanofibrous scaffold for spatiotemporal release. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:13675-13687. [PMID: 22950580 PMCID: PMC3648342 DOI: 10.1021/la302386u] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Controlled molecule release from scaffolds can dramatically increase the scaffold ability of directing tissue regeneration in vitro and in vivo. Crucial to the regeneration is precise regulation over release direction and kinetics of multiple molecules (small genes, peptides, or larger proteins). To this end, we developed gradient micropatterns of electrospun nanofibers along the scaffold thickness through programming the deposition of heterogeneous nanofibers of poly(ε-caprolactone) (PCL) and poly(D,L-lactide-co-glycolide) acid (PLGA). Confocal images of the scaffolds containing fluorophore-impregnated nanofibers demonstrated close matching of actual and designed gradient fiber patterns; thermal analyses further showed their matching in the composition. Using acid-terminated PLGA (PLGAac) and ester-terminated PLGA (PLGAes) to impregnate molecules in the PCL-PLGA scaffolds, we demonstrated for the first time their differences in nanofiber degeneration and molecular weight change during degradation. PLGAac nanofibers were more stable with gradual and steady increase in the fiber diameter during degradation, resulting in more spatially confined molecule delivery from PCL-PLGA scaffolds. Thus, patterns of PCL-PLGAac nanofibers were used to design versatile controlled delivery scaffolds. To test the hypothesis that molecule-impregnated PLGAac in the gradient-patterned PCL-PLGAac scaffolds can program various modalities of molecule release, model molecules, including small fluorophores and larger proteins, were respectively used for time-lapse release studies. Gradient-patterns were used as building blocks in the scaffolds to program simultaneous release of one or multiple proteins to one side or, respectively, to the opposite sides of scaffolds for up to 50 days. Results showed that the separation efficiency of molecule delivery from all the scaffolds with a thickness of 200 μm achieved >88% for proteins and >82% for small molecules. In addition to versatile spatially controlled delivery, micropatterns were designed to program sequential release of proteins. The hierarchically structured materials presented here may enable development of novel multifunctional scaffolds with defined 3D dynamic microenvironments for tissue regeneration.
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Affiliation(s)
- Walter Bonani
- Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, Colorado 80309, United States
- Department of Materials Engineering and Industrial Technologies, BioTech Research Center and INSTM Research Unit, University of Trento, and European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Trento, 38100, Italy
| | - Antonella Motta
- Department of Materials Engineering and Industrial Technologies, BioTech Research Center and INSTM Research Unit, University of Trento, and European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Trento, 38100, Italy
| | - Claudio Migliaresi
- Department of Materials Engineering and Industrial Technologies, BioTech Research Center and INSTM Research Unit, University of Trento, and European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Trento, 38100, Italy
| | - Wei Tan
- Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, Colorado 80309, United States
- Departments of Pediatrics and Bioengineering, University of Colorado at Denver, Aurora, Colorado 80045, United States
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Potential of 2D crosslinked sericin membranes with improved biostability for skin tissue engineering. Cell Tissue Res 2012; 347:783-94. [DOI: 10.1007/s00441-011-1269-4] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2011] [Accepted: 10/20/2011] [Indexed: 11/26/2022]
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36
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McKenna KA, Hinds MT, Sarao RC, Wu PC, Maslen CL, Glanville RW, Babcock D, Gregory KW. Mechanical property characterization of electrospun recombinant human tropoelastin for vascular graft biomaterials. Acta Biomater 2012; 8:225-33. [PMID: 21846510 DOI: 10.1016/j.actbio.2011.08.001] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2011] [Revised: 07/08/2011] [Accepted: 08/01/2011] [Indexed: 12/25/2022]
Abstract
The development of vascular grafts has focused on finding a biomaterial that is non-thrombogenic, minimizes intimal hyperplasia, matches the mechanical properties of native vessels and allows for regeneration of arterial tissue. In this study, the structural and mechanical properties and the vascular cell compatibility of electrospun recombinant human tropoelastin (rTE) were evaluated as a potential vascular graft support matrix. Disuccinimidyl suberate (DSS) was used to cross-link electrospun rTE fibers to produce a polymeric recombinant tropoelastin (prTE) matrix that is stable in aqueous environments. Tubular 1cm diameter prTE samples were constructed for uniaxial tensile testing and 4mm small-diameter prTE tubular scaffolds were produced for burst pressure and cell compatibility evaluations from 15 wt.% rTE solutions. Uniaxial tensile tests demonstrated an average ultimate tensile strength (UTS) of 0.36±0.05 MPa and elastic moduli of 0.15±0.04 and 0.91±0.16 MPa, which were comparable to extracted native elastin. Burst pressures of 485±25 mm Hg were obtained from 4mm internal diameter scaffolds with 453±74 μm average wall thickness. prTE supported endothelial cell growth with typical endothelial cell cobblestone morphology after 48 h in culture. Cross-linked electrospun rTE has promising properties for utilization as a vascular graft biomaterial with customizable dimensions, a compliant matrix and vascular cell compatibility.
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Affiliation(s)
- Kathryn A McKenna
- Oregon Medical Laser Center, Providence St. Vincent Medical Center, Portland, OR 97225, USA
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Lim JS, Ki CS, Kim JW, Lee KG, Kang SW, Kweon HY, Park YH. Fabrication and evaluation of poly(epsilon-caprolactone)/silk fibroin blend nanofibrous scaffold. Biopolymers 2011; 97:265-75. [PMID: 22169927 DOI: 10.1002/bip.22016] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Revised: 11/24/2011] [Accepted: 12/06/2011] [Indexed: 02/02/2023]
Abstract
In this study we investigated the blend electrospinning of poly(ϵ-caprolactone) (PCL) and silk fibroin (SF) to improve the biodegradability and biocompatibility of PCL-based nanofibrous scaffolds. Optimal conditions to fabricate PCL/SF (50/50) blend nanofiber were established for electrospinning using formic acid as a cosolvent and three-dimensional (3D) PCL/SF blend nanofibrous scaffolds were prepared by a modified electrospinning process using methanol coagulation bath. The physical properties of 2D PCL/SF blend nanofiber mats and 3D highly porous blend nanofibrous scaffolds were measured and compared. To evaluate cytocompatibility of the 3D blend scaffolds as compared to 3D PCL nanofibrous scaffold, normal human dermal fibroblasts were cultured. It is concluded that biodegradability and cytocompatibility could be improved for the 3D highly porous PCL/SF (50/50) blend nanofibrous scaffold prepared by blending PCL with SF in electrospinning. In addition to the blending of PCL and SF, the 3D structure and high porosity of electrospun nanofiber assemblies may also be important factors for enhancing the performance of scaffolds.
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Affiliation(s)
- Jun Sik Lim
- Department of Biosystems and Biomaterials Science and Engineering, Seoul National University, Seoul 151-921, Republic of Korea
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Synthetic/Biopolymer Nanofibrous Composites as Dynamic Tissue Engineering Scaffolds. ADVANCES IN POLYMER SCIENCE 2011. [DOI: 10.1007/12_2011_142] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
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