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tissue engineered vascular graft

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https://www.readbyqxmd.com/read/28069505/end-point-immobilization-of-heparin-on-plasma-treated-surface-of-electrospun-polycarbonate-urethane-vascular-graft
#1
Xuefeng Qiu, Benjamin Li-Ping Lee, Xinghai Ning, Niren Murthy, Nianguo Dong, Song Li
: Small-diameter synthetic vascular grafts have high failure rate due to primarily surface thrombogenicity, and effective surface chemical modification is critical to maintain the patency of the grafts. In this study, we engineered a small-diameter, elastic synthetic vascular graft with off-the-shelf availability and anti-thrombogenic activity. Polycarbonate-urethane (PCU), was electrospun to produce nanofibrous grafts that closely mimicked a native blood vessel in terms of structural and mechanical strength...
January 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28038405/comprehensive-mechanical-characterization-of-pla-fabric-combined-with-pcl-to-form-a-composite-structure-vascular-graft
#2
Chaojing Li, Fujun Wang, Graeham Douglas, Ze Zhang, Robert Guidoin, Lu Wang
Vascular grafts made by tissue engineering processes are prone to buckling and twisting, which can impede blood flow and lead to collapse of the vessel. These vascular conduits may suffer not only from insufficient tensile strength, but also from vulnerabilities related to compression, torsion, and pulsatile pressurization. Aiming to develop a tissue engineering-inspired blood conduit, composite vascular graft (cVG) prototypes were created by combining a flexible polylactic acid (PLA) knitted fabric with a soft polycaprolactone (PCL) matrix...
December 15, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28024612/fabrication-of-a-three-dimensional-%C3%AE-tricalcium-phosphate-gelatin-containing-chitosan-based-nanoparticles-for-sustained-release-of-bone-morphogenetic-protein-2-implication-for-bone-tissue-engineering
#3
Farshid Bastami, Zahrasadat Paknejad, Maissa Jafari, Majid Salehi, Maryam Rezai Rad, Arash Khojasteh
Fabrication of an ideal scaffold having proper composition, physical structure and able to have sustained release of growth factors still is challenging for bone tissue engineering. Current study aimed to design an appropriate three-dimensional (3-D) scaffold with suitable physical characteristics, including proper compressive strength, degradation rate, porosity, and able to sustained release of bone morphogenetic protein-2 (BMP2), for bone tissue engineering. A highly porous 3-D β-tricalcium phosphate (β-TCP) scaffolds, inside of which two perpendicular canals were created, was fabricated using foam-casting technique...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28017585/evaluation-of-the-stromal-vascular-fraction-of-adipose-tissue%C3%A2-as-the-basis-for-a-stem-cell-based-tissue-engineered-vascular-graft
#4
Jeffrey T Krawiec, Han-Tsung Liao, LaiYee Lily Kwan, Antonio D'Amore, Justin S Weinbaum, J Peter Rubin, William R Wagner, David A Vorp
OBJECTIVE: One of the rate-limiting barriers within the field of vascular tissue engineering is the lengthy fabrication time associated with expanding appropriate cell types in culture. One particularly attractive cell type for this purpose is the adipose-derived mesenchymal stem cell (AD-MSC), which is abundant and easily harvested from liposuction procedures. Even this cell type has its drawbacks, however, including the required culture period for expansion, which could pose risks of cellular transformation or contamination...
December 22, 2016: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/27999947/comparison-of-in-vivo-immune-responses-following-transplantation-of-vascularized-and-non-vascularized-human-dermo-epidermal-skin-substitutes
#5
Agnes S Klar, Thomas Biedermann, Claudia Simmen-Meuli, Ernst Reichmann, Martin Meuli
PURPOSE: Autologous bio-engineered dermo-epidermal skin substitutes (DESS) represent an alternative therapeutic option for a definitive treatment of skin defects in human patients. Largely, the interaction of host immune cells with transplanted DESS is considered to be essential for the granulation tissue formation, graft take, and its functionality. The aim of this study was to compare the spatiotemporal distribution and density of host-derived monocytes/macrophages and granulocytes in vascularized (vascDESS) versus non-vascularized DESS (non-vascDESS) in a rat model...
December 20, 2016: Pediatric Surgery International
https://www.readbyqxmd.com/read/27999795/in-vivo-remodeling-of-fibroblast-derived-vascular-scaffolds-implanted-for-6-months-in-rats
#6
Maxime Y Tondreau, Véronique Laterreur, Karine Vallières, Robert Gauvin, Jean-Michel Bourget, Catherine Tremblay, Dan Lacroix, Lucie Germain, Jean Ruel, Francois A Auger
There is a clinical need for tissue-engineered small-diameter (<6 mm) vascular grafts since clinical applications are halted by the limited suitability of autologous or synthetic grafts. This study uses the self-assembly approach to produce a fibroblast-derived decellularized vascular scaffold (FDVS) that can be available off-the-shelf. Briefly, extracellular matrix scaffolds were produced using human dermal fibroblasts sheets rolled around a mandrel, maintained in culture to allow for the formation of cohesive and three-dimensional tubular constructs, and decellularized by immersion in deionized water...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27998245/generation-endothelialization-and-microsurgical-suture-anastomosis-of-strong-1-mm-diameter-collagen-tubes
#7
Xuanyue Li, Jing Xu, Calin Nicolescu, Jordann Marinelli, Joe Tien
Tissue-engineered vascular grafts that are based on reconstituted extracellular matrices have been plagued by weak mechanical strength that prevents handling or anastomosis to native vessels. In this study, we devise a method for making dense, suturable collagen tubular constructs of diameter ≤ 1 mm for potential microsurgical applications, by dehydrating tubes of native rat tail type I collagen and crosslinking them with 20 mM genipin. Crosslinked dense collagen tubes with 1 mm inner diameter yielded ultimate tensile strength of 342 ± 15 gram-force and burst pressure of 1313 ± 156 mm Hg, comparable to the strength of a rat femoral artery, and supported endothelial cell adhesion and growth...
December 21, 2016: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/27981886/additive-manufacturing-of-vascular-grafts-and-vascularized-tissue-constructs
#8
Laura Elomaa, Yunzhi Peter Yang
There is a great need for engineered vascular grafts among patients with cardiovascular diseases who are in need of bypass therapy and lack autologous healthy blood vessels. In addition, because of the severe worldwide shortage of organ donors, there is an increasing need for engineered vascularized tissue constructs as an alternative to organ transplants. Additive manufacturing (AM) offers great advantages and flexibility of fabrication of cell-laden, multimaterial, and anatomically shaped vascular grafts and vascularized tissue constructs...
January 10, 2017: Tissue Engineering. Part B, Reviews
https://www.readbyqxmd.com/read/27942617/surface-modification-and-endothelialization-of-polyurethane-for-vascular-tissue-engineering-applications-a-review
#9
REVIEW
Iman Adipurnama, Ming-Chien Yang, Tomasz Ciach, Beata Butruk-Raszeja
Cardiovascular implants, especially vascular grafts made of synthetic polymers, find wide clinical applications in the treatment of cardiovascular diseases. However, cases of failure still exist, notably caused by restenosis and thrombus formation. Aiming to solve these problems, various approaches to surface modification of synthetic vascular grafts have been used to improve both the hemocompatibility and long-term patency of artificial vascular grafts. Surface modification using hydrophilic molecules can enhance hemocompatibility, but this may limit the initial vascular endothelial cell adhesion...
December 20, 2016: Biomaterials Science
https://www.readbyqxmd.com/read/27938900/preclinical-study-of-patient-specific-cell-free-nanofiber-tissue-engineered-vascular-grafts-using-3-dimensional-printing-in-a-sheep-model
#10
Takuma Fukunishi, Cameron A Best, Tadahisa Sugiura, Justin Opfermann, Chin Siang Ong, Toshiharu Shinoka, Christopher K Breuer, Axel Krieger, Jed Johnson, Narutoshi Hibino
BACKGROUND: Tissue-engineered vascular grafts (TEVGs) offer potential to overcome limitations of current approaches for reconstruction in congenital heart disease by providing biodegradable scaffolds on which autologous cells proliferate and provide physiologic functionality. However, current TEVGs do not address the diverse anatomic requirements of individual patients. This study explores the feasibility of creating patient-specific TEVGs by combining 3-dimensional (3D) printing and electrospinning technology...
November 14, 2016: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/27936727/targeting-heparin-to-collagen-within-extracellular-matrix-significantly-reduces-thrombogenicity-and-improves-endothelialization-of-decellularized-tissues
#11
Bin Jiang, Rachel Suen, Jason A Wertheim, Guillermo A Ameer
Thrombosis within small-diameter vascular grafts limits the development of bioartificial, engineered vascular conduits, especially those derived from extracellular matrix (ECM). Here we describe an easy-to-implement strategy to chemically modify vascular ECM by covalently linking a collagen binding peptide (CBP) to heparin to form a heparin derivative (CBP-heparin) that selectively binds a subset of collagens. Modification of ECM with CBP-heparin leads to increased deposition of functional heparin (by ∼7...
12, 2016: Biomacromolecules
https://www.readbyqxmd.com/read/27912680/biomimetic-approaches-for-bone-tissue-engineering
#12
Johnathan Ng, Kara Spiller, Jonathan Bernhard, Gordana Vunjak-Novakovic
Although autologous bone grafts are considered a gold standard for the treatment of bone defects, they are limited by donor site morbidities and geometric requirements. Tissue engineering can overcome such limitations by creating fully viable biological bone grafts. We review here the use of native bone matrix, autologous mesenchymal cells and perfusion bioreactor systems as a tissue-engineering paradigm to grow bone in vitro. We also discuss emergent vascularization strategies to promote graft survival in vivo, and the role of inflammation in bone repair...
December 2, 2016: Tissue Engineering. Part B, Reviews
https://www.readbyqxmd.com/read/27911030/acellular-endocardium-as-a-novel-biomaterial-for-the-intima-of-tissue-engineered-small-caliber-vascular-grafts
#13
Feng Wang, Xin Guan, TianYi Wu, JianOu Qiao, ZhaoQing Han, JinLong Wu, XiaoWei Yu, QingJun You
We aimed to investigate whether acellular endocardium can be used as a useful biomaterial for the intima of engineered small-caliber vascular grafts. Fresh endocardium was harvested from the swine left atrium and was decellularized by digestion with the decellularization solution of Triton X-100 and SDS containing DNase I and RNase A. Surface morphological characteristics and Young's modulus were evaluated. To analyze the effect of mechanical characteristics on cell adhesion, the decellularized endocardium was stiffened with 2...
December 2016: Artificial Organs
https://www.readbyqxmd.com/read/27906688/layer-by-layer-approach-for-a-uniformed-fabrication-of-a-cell-patterned-vessel-like-construct
#14
Camila A Wilkens, Christopher J Rivet, Tamara L Akentjew, Julian Alverio, Maroun Khoury, Juan Pablo Acevedo
Successful tissue engineered small diameter blood vessels (SDBV) require manufacturing systems capable of precisely controlling different key elements, such as material composition, geometry and spatial location of specialized biomaterials and cells types. We report in this work an automated methodology that enables the manufacture of multilayer cylindrical constructs for SDBV fabrication that uses a layer-by-layer deposition approach while controlling variables such as dipping and spinning speed of a rod and biomaterial viscosity...
December 1, 2016: Biofabrication
https://www.readbyqxmd.com/read/27902740/extensive-characterization-and-comparison-of-endothelial-cells-derived-from-dermis-and-adipose-tissue-potential-use-in-tissue-engineering
#15
Hanneke N Monsuur, Ester M Weijers, Frank B Niessen, Amit Gefen, Pieter Koolwijk, Susan Gibbs, Lenie J van den Broek
Tissue-engineered constructs need to become quickly vascularized in order to ensure graft take. One way of achieving this is to incorporate endothelial cells (EC) into the construct. The adipose tissue stromal vascular fraction (adipose-SVF) might provide an alternative source for endothelial cells as adipose tissue can easily be obtained by liposuction. Since adipose-EC are now gaining more interest in tissue engineering, we aimed to extensively characterize endothelial cells from adipose tissue (adipose-EC) and compare them with endothelial cells from dermis (dermal-EC)...
2016: PloS One
https://www.readbyqxmd.com/read/27889329/perivascular-cells-and-tissue-engineering-current-applications-and-untapped-potential
#16
REVIEW
Elisa Avolio, Valeria V Alvino, Mohamed T Ghorbel, Paola Campagnolo
The recent development of tissue engineering provides exciting new perspectives for the replacement of failing organs and the repair of damaged tissues. Perivascular cells, including vascular smooth muscle cells, pericytes and other tissue specific populations residing around blood vessels, have been isolated from many organs and are known to participate to the in situ repair process and angiogenesis. Their potential has been harnessed for cell therapy of numerous pathologies; however, in this Review we will discuss the potential of perivascular cells in the development of tissue engineering solutions for healthcare...
November 24, 2016: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/27865963/improved-vascularization-of-porous-scaffolds-through-growth-factor-delivery-from-heparinized-polyethylene-glycol-hydrogels
#17
Aliza Janse van Rensburg, Neil H Davies, Anel Oosthuysen, Cindy Chokoza, Peter Zilla, Deon Bezuidenhout
: Surface modification with heparin has previously been shown to increase vascularization of porous scaffolds. In order to determine its efficacy with sustained release, heparin (Hep) was covalently incorporated into degradable (Type D) and non-degradable (Type N) polyethylene glycol (PEG) hydrogels. After in vitro characterization of their physicochemical properties, growth factor (GF) loaded, heparinised Type D gels were formed within the pores of porous polyurethane disks, which were then implanted and evaluated in a subcutaneous model...
November 16, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27860431/ureteral-reconstruction-with-reinforced-collagen-scaffolds-in-a-porcine-model
#18
Paul de Jonge, Vasileios Simaioforidis, Paul Geutjes, Egbert Oosterwijk, Wout Feitz
Repair of long ureteral defects often requires extensive surgical procedures and graft tissue which is associated with various complications, e.g. graft site morbidity or lack of suitable tissue. Tissue engineering might provide an alternative therapeutic approach in these cases. Reinforced tubular collagen-Vicryl scaffolds (l = 5 cm, lumen Ø = 6 mm, thickness = 3 mm) were developed with or without vascular endothelial growth factor and basic fibroblast growth factor and evaluated in a pre-clinical porcine model...
November 16, 2016: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/27856147/in-vivo-tissue-engineered-bone-versus-autologous-bone-stability-and-structure
#19
R M Zimmerer, P Jehn, H Kokemüller, R Abedian, M Lalk, F Tavassol, N-C Gellrich, S Spalthoff
This pilot study investigated the biomechanical properties of prefabricated, vascularized bioartificial bone grafts, which may provide an alternative bone source for the restoration of segmental osseous defects. Vascularized bioartificial bone grafts comprise an artificial customized scaffold made of beta-tricalcium phosphate. Bone formation along the prefabricated scaffold is induced by autogenous cancellous bone. Vascularization of the bone graft is provided by the host's vascular system. Within 6 months, a mammalian bioreactor (sheep were used in the present study) creates heterotopic vascularized bioartificial bone grafts of a predetermined anatomical shape, which can be harvested for reconstructing osseous defects...
November 14, 2016: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/27854352/conjugation-with-rgd-peptides-and-incorporation-of-vascular-endothelial-growth-factor-are-equally-efficient-for-biofunctionalization-of-tissue-engineered-vascular-grafts
#20
Larisa V Antonova, Alexander M Seifalian, Anton G Kutikhin, Victoria V Sevostyanova, Vera G Matveeva, Elena A Velikanova, Andrey V Mironov, Amin R Shabaev, Tatiana V Glushkova, Evgeniya A Senokosova, Georgiy Yu Vasyukov, Evgeniya O Krivkina, Andrey Yu Burago, Yuliya A Kudryavtseva, Olga L Barbarash, Leonid S Barbarash
The blend of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and poly(ε-caprolactone) (PCL) has recently been considered promising for vascular tissue engineering. However, it was shown that PHBV/PCL grafts require biofunctionalization to achieve high primary patency rate. Here we compared immobilization of arginine-glycine-aspartic acid (RGD)-containing peptides and the incorporation of vascular endothelial growth factor (VEGF) as two widely established biofunctionalization approaches. Electrospun PHBV/PCL small-diameter grafts with either RGD peptides or VEGF, as well as unmodified grafts were implanted into rat abdominal aortas for 1, 3, 6, and 12 months following histological and immunofluorescence assessment...
November 16, 2016: International Journal of Molecular Sciences
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