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https://www.readbyqxmd.com/read/29344309/adult-stem-cells-in-vascular-remodeling
#1
REVIEW
Dong Wang, LeeAnn K Li, Tiffany Dai, Aijun Wang, Song Li
Understanding the contribution of vascular cells to blood vessel remodeling is critical for the development of new therapeutic approaches to cure cardiovascular diseases (CVDs) and regenerate blood vessels. Recent findings suggest that neointimal formation and atherosclerotic lesions involve not only inflammatory cells, endothelial cells, and smooth muscle cells, but also several types of stem cells or progenitors in arterial walls and the circulation. Some of these stem cells also participate in the remodeling of vascular grafts, microvessel regeneration, and formation of fibrotic tissue around biomaterial implants...
2018: Theranostics
https://www.readbyqxmd.com/read/29338566/constructing-heparin-modified-pancreatic-decellularized-scaffold-to-improve-its-re-endothelialization
#2
Liancheng Xu, Yibing Guo, Yan Huang, Yicheng Xiong, Yang Xu, Xiaohong Li, Jingjing Lu, Lei Wang, Yao Wang, Yuhua Lu, Zhiwei Wang
Pancreas transplantation is considered as a promising therapeutic option with the potential to cure diabetes. However, efficacy of current clinical transplantation is limited by the donor organ. With regard to creating a functional pancreas-tissue equivalent for transplantation, vascularization remains a large obstacle. To enhance the angiogenic properties of pancreatic decellularized scaffold, surface modification of the vasculature was used to promote endothelialization efficiency. In this study, an endothelialized pancreatic decellularized scaffold was obtained through heparin modification under mild conditions...
January 1, 2018: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/29284454/the-effect-of-low-intensity-shockwave-treatment-li-swt-on-human-myoblasts-and-mouse-skeletal-muscle
#3
Lise K Hansen, Henrik D Schrøder, Lars Lund, Karthikeyan Rajagopal, Vrisha Maduri, Jeeva Sellathurai
BACKGROUND: Transplanting myogenic cells and scaffolds for tissue engineering in skeletal muscle have shown inconsistent results. One of the limiting factors is neovascularization at the recipient site. Low intensity shockwave therapy (Li-SWT) has been linked to increased tissue regeneration and vascularization, both integral to survival and integration of transplanted cells. This study was conducted to demonstrate the response of myoblasts and skeletal muscle to Li-SWT. METHOD: Primary isolated human myoblasts and explants were treated with low intensity shockwaves and subsequently cell viability, proliferation and differentiation were tested...
December 29, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29259724/introduction-of-vasculature-in-engineered-three-dimensional-tissue
#4
REVIEW
Sachiko Sekiya, Tatsuya Shimizu
Background: With recent developments in tissue engineering technology, various three-dimensional tissues can be generated now. However, as the tissue thickness increases due to three-dimensionalization, it is difficult to increase the tissue scale without introduction of blood vessels. Main text: Many methods for vasculature induction have been reported recently. In this review, we introduced several methods which are adjustable vascularization in three-dimensional tissues according to three steps...
2017: Inflammation and Regeneration
https://www.readbyqxmd.com/read/29250114/tissue-engineered-vascular-graft-of-small-diameter-based-on-electrospun-polylactide-microfibers
#5
P V Popryadukhin, G I Popov, G Yu Yukina, I P Dobrovolskaya, E M Ivan'kova, V N Vavilov, V E Yudin
Tubular vascular grafts 1.1 mm in diameter based on poly(L-lactide) microfibers were obtained by electrospinning. X-ray diffraction and scanning electron microscopy data demonstrated that the samples treated at T = 70°C for 1 h in the fixed state on a cylindrical mandrel possessed dense fibrous structure; their degree of crystallinity was approximately 44%. Strength and deformation stability of these samples were higher than those of the native blood vessels; thus, it was possible to use them in tissue engineering as bioresorbable vascular grafts...
2017: International Journal of Biomaterials
https://www.readbyqxmd.com/read/29248244/patency-and-in%C3%A2-vivo-compatibility-of-bacterial-nanocellulose-grafts-as-small-diameter-vascular-substitute
#6
Carolyn Weber, Stefanie Reinhardt, Kaveh Eghbalzadeh, Max Wacker, Maria Guschlbauer, Alexandra Maul, Anja Sterner-Kock, Thorsten Wahlers, Jens Wippermann, Max Scherner
OBJECTIVE: Despite the clinical success of large-diameter vascular grafts, synthetic grafts in small-diameter vessels are of limited use because of their poor patency rates. Previous experiments of our group provided evidence for good biocompatibility of bacterial nanocellulose (BNC) as a small-vessel graft in the carotid artery in sheep. However, the patency rate of our first-generation tubes after 3 months was only 50%. To advance our concept, we now used modified second-generation tubes with diminished wall thickness and a smoother inner surface to reduce the thrombogenic potential...
December 13, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/29247167/shear-induced-notch-cx37-p27-axis-arrests-endothelial-cell-cycle-to-enable-arterial-specification
#7
Jennifer S Fang, Brian G Coon, Noelle Gillis, Zehua Chen, Jingyao Qiu, Thomas W Chittenden, Janis M Burt, Martin A Schwartz, Karen K Hirschi
Establishment of a functional vascular network is rate-limiting in embryonic development, tissue repair and engineering. During blood vessel formation, newly generated endothelial cells rapidly expand into primitive plexi that undergo vascular remodeling into circulatory networks, requiring coordinated growth inhibition and arterial-venous specification. Whether the mechanisms controlling endothelial cell cycle arrest and acquisition of specialized phenotypes are interdependent is unknown. Here we demonstrate that fluid shear stress, at arterial flow magnitudes, maximally activates NOTCH signaling, which upregulates GJA4 (commonly, Cx37) and downstream cell cycle inhibitor CDKN1B (p27)...
December 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/29242161/preparation-of-dexamethasone-loaded-biphasic-calcium-phosphate-nanoparticles-collagen-porous-composite-scaffolds-for-bone-tissue-engineering
#8
Ying Chen, Naoki Kawazoe, Guoping Chen
Although bone is regenerative, its regeneration capacity is limited. For bone defects beyond a critical size, further intervention is required. As an attractive strategy, bone tissue engineering (bone TE) has been widely investigated to repair bone defects. However, the rapid and effective bone regeneration of large non-healing defects is still a great challenge. Multifunctional scaffolds having osteoinductivity and osteoconductivity are desirable to fasten functional bone tissue regeneration. In the present study, biomimetic composite scaffolds of collagen and biphasic calcium phosphate nanoparticles (BCP NPs) with a controlled release of dexamethasone (DEX) and the controlled pore structures were prepared for bone TE...
December 11, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29227904/manipulating-the-structure-and-mechanical-properties-of-thermoplastic-polyurethane-polycaprolactone-hybrid-small-diameter-vascular-scaffolds-fabricated-via-electrospinning-using-an-assembled-rotating-collector
#9
Hao-Yang Mi, Xin Jing, Emily Yu, Xiaofeng Wang, Qian Li, Lih-Sheng Turng
The success of blood vessel transplants with vascular scaffolds (VSs) highly depends on their structure and mechanical properties. The fabrication of small diameter vascular scaffolds (SDVSs) mimicking the properties of native blood vessels has been a challenge. Herein, we propose a facile method to fabricate thermoplastic polyurethane (TPU)/polycaprolactone (PCL) hybrid SDVSs via electrospinning using a modified rotating collector. By varying the ratio between the TPU and the PCL, and changing the electrospinning volume, SDVSs with a wavy configuration and different properties could be obtained...
December 1, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29223704/decellularized-heart-ecm-hydrogel-using-supercritical-carbon-dioxide-for-improved-angiogenesis
#10
Yoojin Seo, Youngmee Jung, Soo Hyun Kim
Initial angiogenesis within the first 3 days is critical for healing ischemic diseases such as myocardial infarction. Recently, decellularized extracellular matrix (dECM) has been reported to provide tissue-derived ECM components and can be used as a scaffold for cell delivery for angiogenesis in tissue engineering. Decellularization by various detergents such as sodium dodecyl sulfate (SDS) and triton X-100 can remove the cell nuclei in tissue organs. However, this leads to ECM structure denaturation, decreased presence of various ECM proteins and cytokines, and loss of mechanical properties...
December 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29222786/nerve-growth-factor-induced-angiogenesis-1-endothelial-cell-tube-formation-assay
#11
Philip Lazarovici, Adi Lahiani, Galit Gincberg, Dikla Haham, Arnon Fluksman, Ofra Benny, Cezary Marcinkiewicz, Peter I Lelkes
Nerve growth factor (NGF) is a neurotrophin promoting survival, proliferation, differentiation, and neuroprotection in the embryonal and adult nervous system. NGF also induces angiogenic effects in the cardiovascular system, which may be beneficial in engineering new blood vessels and for developing novel anti-angiogenesis therapies for cancer. Angiogenesis is a cellular process characterized by a number of events, including endothelial cell migration, invasion, and assembly into capillaries. In vitro endothelial tube formation assays are performed using primary human umbilical vein endothelial cells, human aortic endothelial cells, and other human or rodent primary endothelial cells isolated from the vasculature of both tumors and normal tissues...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29222694/preparation-and-evaluation-of-decellularized-porcine-carotid-arteries-cross-linked-by-genipin-the-preliminary-results
#12
Yongquan Gu, Fei Wang, Rong Wang, Jianxin Li, Cong Wang, Liqiang Li, Zeqin Xu, Jian Zhang
Decellularized arteries have been considered as promising scaffolds for small-diameter vascular substitutes. However, weakened mechanical properties, immunological rejection and rapid degradation after transplantation still exist after decellularization. Previous studies indicated that genipin cross-linking can solve these problems. Therefore, genipin was selected as the cross-linking agent for the pre-treatment of decellularized arteries in our study. Histological analysis, scanning electron microscopy, mechanical properties analysis and subcutaneous embedding experiment were adopted to investigate the efficiency of decellularization and the effect of genipin cross-linking on improving mechanical, structural and biological properties of decellularized arteries...
December 8, 2017: Cell and Tissue Banking
https://www.readbyqxmd.com/read/29208986/immune-tuning-scaffold-for-the-local-induction-of-a-pro-regenerative-environment
#13
Bruna Corradetti, Francesca Taraballi, Claudia Corbo, Fernando Cabrera, Laura Pandolfi, Silvia Minardi, Xin Wang, Jeffrey Van Eps, Guillermo Bauza, Bradley Weiner, Ennio Tasciotti
In mammals, tissue regeneration is accomplished through a well-regulated, complex cascade of events. The disruption of the cellular and molecular processes involved in tissue healing might lead to scar formation. Most tissue engineering approaches have tried to improve the regenerative outcome following an injury, through the combination of biocompatible materials, stem cells and bioactive factors. However, implanted materials can cause further healing impairments due to the persistent inflammatory stimuli that trigger the onset of chronic inflammation...
December 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29205878/exosome-modified-tissue-engineered-blood-vessel-for-endothelial-progenitor-cell-capture-and-targeted-sirna-delivery
#14
Wen Chen, Mingcan Yang, Jian Bai, Xiang Li, Xiangrui Kong, Yu Gao, Lili Bi, Li Xiao, Bingyi Shi
Instability and poor targeting causes the long-term patency of RNA-modified tissue engineering blood vessels (TEBVs) remaining unsatisfactory. RNA can be enriched in exosome and then delivered into targeted cells while whether exosome-modified TEBVs achieve RNA targeted delivery is unclear. Here, to promote the expression of klotho protein on the mesenchymal stem cell (MSC)-derived exosomes, klotho plasmids are first transfected into MSCs, and adenosine kinase (ADK) siRNA is then loaded into exosome (klotho/ADK siRNA-exosome) using electrotransfection...
December 4, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/29196952/fabrication-and-characterization-of-electrospun-bi-hybrid-pu-pet-scaffolds-for-small-diameter-vascular-grafts-applications
#15
Marziyeh Khodadoust, Davod Mohebbi-Kalhori, Nafiseh Jirofti
In spite of advances have been made during the past decades, the problems associated with small-diameter vascular grafts, including low patency and compliance mismatch and in consequence of that thrombosis, aneurysm and intimal hyperplasia are still challenges. To address these problems, net polyurethane (PU) and poly (ethylene terephthalate) (PET) polymers and hybrid PU/PET were electrospun to create three different types of small-diameter vascular scaffolds due to their unique physicochemical characteristics: PU, PET, and novel hybrid PU/PET scaffolds...
December 1, 2017: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/29178903/development-and-in-vivo-validation-of-tissue-engineered-small-diameter-vascular-grafts-from-decellularized-aortae-of-fetal-pigs-and-canine-vascular-endothelial-cells
#16
Xu Ma, Zhijuan He, Ling Li, Guofeng Liu, Qingchun Li, Daping Yang, Yingbo Zhang, Ning Li
BACKGROUND: Tissue engineering has emerged as a promising alternative for small-diameter vascular grafts. The aim of this study was to determine the feasibility of using decellularized aortae of fetal pigs (DAFPs) to construct tissue-engineered, small-diameter vascular grafts and to test the performance and application of DAFPs as vascular tissue-engineered scaffolds in the canine arterial system. METHODS: DAFPs were prepared by continuous enzymatic digestion. Canine vascular endothelial cells (ECs) were seeded onto DAFPs in vitro and then the vascular grafts were cultured in a custom-designed vascular bioreactor system for 7 days of dynamic culture following 3 days of static culture...
November 25, 2017: Journal of Cardiothoracic Surgery
https://www.readbyqxmd.com/read/29172448/oxidized-alginate-based-hydrogels-for-tissue-engineering-applications-a-review
#17
Supachai Reakasame, Aldo R Boccaccini
Oxidized alginate (OA) based hydrogels have drawn considerable attention as biodegradable materials for tissue engineering applications. OA possesses a faster degradation rate and contains more reactive groups compared to native alginate. This review summarizes the research publications reporting the development of OA based hydrogels for tissue engineering applications including bone, cartilage, blood vessel, cornea and other soft tissues and highlighting OA key properties and processing approaches.
November 27, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29128537/biomaterials-for-articular-cartilage-tissue-engineering-learning-from-biology
#18
REVIEW
A R Armiento, M J Stoddart, M Alini, D Eglin
Articular cartilage is commonly described as a tissue made of up to 80% water, devoid of blood vessels, nerves and lymphatics, and populated by only one cell type: at first glance, an easy tissue for clinicians to repair and for scientists to reproduce in a laboratory. Yet, chondral and osteochondral defects currently remain an open challenge in orthopedics and tissue engineering of the musculoskeletal system, without considering osteoarthritis. Why do we fail in repairing and regenerating articular cartilage? Behind its simple and homogenous appearance articular cartilage hides a heterogeneous composition, a high level of organisation and specific biomechanical properties that taken together make articular cartilage a unique material that we are not able yet to repair or reproduce with high fidelity...
November 8, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29127293/three-dimensional-printed-polylactic-acid-hydroxyapatite-composite-scaffolds-for-prefabricating-vascularized-tissue-engineered-bone-an-in-vivo-bioreactor-model
#19
Haifeng Zhang, Xiyuan Mao, Danyang Zhao, Wenbo Jiang, Zijing Du, Qingfeng Li, Chaohua Jiang, Dong Han
The repair of large bone defects with complex geometries remains a major clinical challenge. Here, we explored the feasibility of fabricating polylactic acid-hydroxyapatite (PLA-HA) composite scaffolds. These scaffolds were constructed from vascularized tissue engineered bone using an in vivo bioreactor (IVB) strategy with three-dimensional printing technology. Specifically, a rabbit model was established to prefabricate vascularized tissue engineered bone in two groups. An experimental group (EG) was designed using a tibial periosteum capsule filled with 3D printed (3DP) PLA-HA composite scaffolds seeded with bone marrow stromal cells (BMSCs) and crossed with a vascular bundle...
November 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29119674/assessment-of-hydrogels-for-bioprinting-of-endothelial-cells
#20
Leo Benning, Ludwig Gutzweiler, Kevin Tröndle, Julian Riba, Roland Zengerle, Peter Koltay, Stefan Zimmermann, G Björn Stark, Günter Finkenzeller
In tissue engineering applications, vascularization can be accomplished by co-implantation of tissue forming cells and endothelial cells (ECs), whereby the latter are able to form functional blood vessels. The use of three-dimensional (3D) bioprinting technologies has the potential to improve the classical tissue engineering approach because these will allow the generation of scaffolds with high spatial control of endothelial cell allocation. This study focuses on a side by side comparisons of popular commercially available bioprinting hydrogels (matrigel, fibrin, collagen, gelatin, agarose, Pluronic F-127, alginate and alginate/gelatin) in the context of their physicochemical parameters, their swelling/degradation characteristics, their biological effects on vasculogenesis-related EC parameters and their printability...
November 8, 2017: Journal of Biomedical Materials Research. Part A
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