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tissue engineered vascular graft

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https://www.readbyqxmd.com/read/27912680/biomimetic-approaches-for-bone-tissue-engineering
#1
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
#2
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
#3
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
#4
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
#5
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 23, 2016: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/27865963/improved-vascularization-of-porous-scaffolds-through-growth-factor-delivery-from-heparinized-polyethylene-glycol-hydrogels
#6
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
#7
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
#8
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
#9
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
https://www.readbyqxmd.com/read/27833916/patterning-of-endothelial-cells-and-mesenchymal-stem-cells-by-laser-assisted-bioprinting-to-study-cell-migration
#10
Jean-Michel Bourget, Olivia Kérourédan, Manuela Medina, Murielle Rémy, Noélie Brunehilde Thébaud, Reine Bareille, Olivier Chassande, Joëlle Amédée, Sylvain Catros, Raphaël Devillard
Tissue engineering of large organs is currently limited by the lack of potent vascularization in vitro. Tissue-engineered bone grafts can be prevascularized in vitro using endothelial cells (ECs). The microvascular network architecture could be controlled by printing ECs following a specific pattern. Using laser-assisted bioprinting, we investigated the effect of distance between printed cell islets and the influence of coprinted mesenchymal cells on migration. When printed alone, ECs spread out evenly on the collagen hydrogel, regardless of the distance between cell islets...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27818910/biologically-inspired-smart-release-system-based-on-3d-bioprinted-perfused-scaffold-for-vascularized-tissue-regeneration
#11
Haitao Cui, Wei Zhu, Benjamin Holmes, Lijie Grace Zhang
A critical challenge to the development of large-scale artificial tissue grafts for defect reconstruction is vascularization of the tissue construct. As an emerging tissue/organ manufacturing technique, 3D bioprinting offers great precision in controlling the internal architecture of a scaffold with preferable mechanical strength and printing complicated microstructures comparable to native tissue. However, current bioprinting techniques still exhibit difficulty in achieving biomimetic nano resolution and cooperating with bioactive spatiotemporal signals...
August 2016: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/27807283/cardiac-repair-in-guinea-pigs-with-human-engineered-heart-tissue-from-induced-pluripotent-stem-cells
#12
Florian Weinberger, Kaja Breckwoldt, Simon Pecha, Allen Kelly, Birgit Geertz, Jutta Starbatty, Timur Yorgan, Kai-Hung Cheng, Katrin Lessmann, Tomas Stolen, Marielle Scherrer-Crosbie, Godfrey Smith, Hermann Reichenspurner, Arne Hansen, Thomas Eschenhagen
Myocardial injury results in a loss of contractile tissue mass that, in the absence of efficient regeneration, is essentially irreversible. Transplantation of human pluripotent stem cell-derived cardiomyocytes has beneficial but variable effects. We created human engineered heart tissue (hEHT) strips from human induced pluripotent stem cell (hiPSC)-derived cardiomyocytes and hiPSC-derived endothelial cells. The hEHTs were transplanted onto large defects (22% of the left ventricular wall, 35% decline in left ventricular function) of guinea pig hearts 7 days after cryoinjury, and the results were compared with those obtained with human endothelial cell patches (hEETs) or cell-free patches...
November 2, 2016: Science Translational Medicine
https://www.readbyqxmd.com/read/27784199/dynamic-autologous-re-endothelializaition-of-small-caliber-arterial-extracellular-matrix-a-preclinical-large-animal-study
#13
Nitsan Dahan, Udi Sarig, Tomer Bronshtein, Limor Baruch, Tony Karram, Aaron Hoffman, Marcelle Machluf
Effective cellularization is a key approach to prevent small-caliber (<4mm) tissue engineered vascular graft (TEVG) failure and maintain patency and contractility following implantation. To achieve this goal, however, improved bio-mimicking designs, and/or relatively long production times (typically several months) are required. We previously reported on porcine carotid artery decellularization yielding biomechanically stable, and cell supportive small caliber (3-4mm diameter, 5cm long) arterial extracellular matrix (scaECM) vascular grafts...
October 26, 2016: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/27782370/pericyte-seeded-dual-peptide-scaffold-with-improved-endothelialization-for-vascular-graft-tissue-engineering
#14
Paola Campagnolo, Adam J Gormley, Lesley W Chow, Anne Géraldine Guex, Paresh A Parmar, Jennifer L Puetzer, Joseph A M Steele, Alexandre Breant, Paolo Madeddu, Molly M Stevens
The development of synthetic vascular grafts for coronary artery bypass is challenged by insufficient endothelialization, which increases the risk of thrombosis, and the lack of native cellular constituents, which favors pathological remodeling. Here, a bifunctional electrospun poly(ε-caprolactone) (PCL) scaffold with potential for synthetic vascular graft applications is presented. This scaffold incorporates two tethered peptides: the osteopontin-derived peptide (Adh) on the "luminal" side and a heparin-binding peptide (Hep) on the "abluminal" side...
October 26, 2016: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/27778466/a-double-chamber-rotating-bioreactor-for-enhanced-tubular-tissue-generation-from-human-mesenchymal-stem-cells
#15
I Stefani, M A Asnaghi, J J Cooper-White, S Mantero
Cardiovascular diseases represent a major global health burden, with high rates of mortality and morbidity. Autologous grafts are commonly used to replace damaged or failing blood vessels, however such approaches are hampered by the scarcity of suitable graft tissue, donor site morbidity and poor long-term stability. Tissue engineering has been investigated as a means by which exogenous vessel grafts can be produced, with varying levels of success to date, a result of mismatched mechanical properties of these vessel substitutes and inadequate ex vivo vessel tissue genesis...
October 24, 2016: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/27770546/skeletal-muscle-patch-engineering-on-synthetic-and-acellular-human-skeletal-muscle-originated-scaffolds
#16
Birol Ay, Erdal Karaoz, Cumhur C Kesemenli, Halime Kenar
The reconstruction of skeletal muscle tissue is currently performed by transplanting a muscle tissue graft from local or distant sites of the patient`s body, but this practice leads to donor site morbidity in case of large defects. With the aim of providing an alternative treatment approach, skeletal muscle tissue formation potential of human myoblasts and human menstrual blood derived mesenchymal stem cells (hMB-MSCs) on synthetic (poly(L-lactide-co-caprolactone), 70:30) scaffolds with oriented microfibers, human muscle extracellular matrix (ECM), and their hybrids was investigated in this study...
October 22, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27725856/differentiate-into-urothelium-and-smooth-muscle-cells-from-adipose-tissue-derived-stem-cells-for-ureter-reconstruction-in-a-rabbit-model
#17
Zhankui Zhao, Honglian Yu, Chengjuan Fan, Qingsheng Kong, Deqian Liu, Lin Meng
Ureter reconstruction is still a tough task for urologist. Cell-based tissue engineering serves a better technique for patients with long segments of ureter defect who need ureter reconstruction. In this study, we sought to evaluate the differentiation potential of adipose derived stem cells (ADSCs) into urothelial lineage and smooth muscle lineage and to assess the possibility of ureter reconstruction using differentiated cells seeded vessel extracellular matrix (VECM) in a rabbit model. ADSCs were isolated from adipose tissue and identified in vitro...
2016: American Journal of Translational Research
https://www.readbyqxmd.com/read/27686755/electromechanical-conditioning-of-adult-progenitor-cells-improves-recovery-of-cardiac-function-after-myocardial-infarction
#18
Aida Llucià-Valldeperas, Carolina Soler-Botija, Carolina Gálvez-Montón, Santiago Roura, Cristina Prat-Vidal, Isaac Perea-Gil, Benjamin Sanchez, Ramon Bragos, Gordana Vunjak-Novakovic, Antoni Bayes-Genis
: : Cardiac cells are subjected to mechanical and electrical forces, which regulate gene expression and cellular function. Therefore, in vitro electromechanical stimuli could benefit further integration of therapeutic cells into the myocardium. Our goals were (a) to study the viability of a tissue-engineered construct with cardiac adipose tissue-derived progenitor cells (cardiac ATDPCs) and (b) to examine the effect of electromechanically stimulated cardiac ATDPCs within a myocardial infarction (MI) model in mice for the first time...
September 29, 2016: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/27679753/cytokine-rich-adipose-tissue-extract-production-from-water-assisted-lipoaspirate-methodology-for-clinical-use
#19
Jenny Lopez, Outi Huttala, Jertta-Riina Sarkanen, Ilkka Kaartinen, Hannu Kuokkanen, Timo Ylikomi
Proper functioning wound healing strategies are sparse. Adequate vascular formation to the injured area, as well as replacement of the volume loss, is fundamental in soft tissue repair. Tissue engineering strategies have been proposed for the treatment of these injury sites. Novel cell-free substance, human adipose tissue extract (ATE), has been previously shown to induce in vitro angiogenesis and adipogenesis and in vivo soft tissue formation. This study reports the translation of ATE preparation from laboratory to the operating room (OR)...
2016: BioResearch Open Access
https://www.readbyqxmd.com/read/27676438/tissue-engineering-of-acellular-vascular-grafts-capable-of-somatic-growth-in-young-lambs
#20
Zeeshan Syedain, Jay Reimer, Matthew Lahti, James Berry, Sandra Johnson, Robert T Tranquillo
Treatment of congenital heart defects in children requiring right ventricular outflow tract reconstruction typically involves multiple open-heart surgeries because all existing graft materials have no growth potential. Here we present an 'off-the-shelf' vascular graft grown from donor fibroblasts in a fibrin gel to address this critical unmet need. In a proof-of-concept study, the decellularized grafts are implanted as a pulmonary artery replacement in three young lambs and evaluated to adulthood. Longitudinal ultrasounds document dimensional growth of the grafts...
September 27, 2016: Nature Communications
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