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Tissue Engineering. Part A

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https://www.readbyqxmd.com/read/29214889/cell-seeded-adhesive-biomaterial-for-repair-of-annulus-fibrosus-defects-in-intervertebral-discs
#1
Michelle A Cruz, Warren W Hom, Distefano Tyler, Robert Merrill, Olivia M Torre, Huizi A Lin, Andrew Hecht, Svenja Illien-Junger, James C Iatridis
Defects in the annulus fibrosus (AF) of intervertebral discs allow nucleus pulposus tissue to herniate causing painful disability. Microdiscectomy procedures remove herniated tissue fragments but unrepaired defects remain allowing reherniation or progressive degeneration. Cell therapies show promise to enhance repair but methods are undeveloped and carriers are required to prevent cell leakage. To address this challenge, this study developed and evaluated genipin-crosslinked fibrin (FibGen) as an adhesive cell carrier optimized for AF repair that can deliver cells, match AF material properties and have low risk of extrusion during loading...
December 7, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29187125/nitro-oleic-acid-no2oa-release-enhances-regional-angiogenesis-in-a-rat-abdominal-wall-defect-model
#2
Antonio D'Amore, Marco Fazzari, Hongbin Jiang, Samuel K Luketich, Michael E Luketich, Richard F Hoff, Daniel L Jacobs, Xinzhu Gu, Stephen F Badylak, Bruce A Freeman, William R Wagner
Ventral hernia is often addressed surgically by the placement of prosthetic materials, either synthetic or from allogeneic and xenogeneic biologic sources. Despite advances in surgical approaches and device design, a number of postsurgical limitations remain, including hernia recurrence, mesh encapsulation, and reduced vascularity of the implanted volume. The in situ controlled release of angiogenic factors from a scaffold facilitating abdominal wall repair might address some of these issues associated with sub-optimal tissue reconstruction...
November 29, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29160182/enhanced-bone-regeneration-via-diabetic-cell-based-adenoviral-bmp2-gene-therapy-in-diabetic-animals
#3
Shin-Young Park, Kyoung-Hwa Kim, Chan Ho Park, Seung-Yun Shin, In-Chul Rhuy, Yong-Moo Lee, Yang Jo Seol
The application of bone morphogenetic protein 2 (BMP-2) has been extensively investigated to improve diabetes-impaired bone healing; however, the delivery of BMP-2 via gene therapy for bone regeneration has rarely been investigated in diabetic animals. In this study, we aimed to evaluate which cells induce more new bone formation in diabetic animals when cell-based BMP2 gene therapy is applied. For this purpose, we harvested bone marrow stromal cells (BMSCs) twice in the same animal before (non-diabetic BMSCs; nBMSCs) and after diabetes induction (diabetic BMSCs; dBMSCs) using modified bone marrow ablation methods...
November 21, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29160181/chick-embryo-model-homing-and-host-interactions-of-tissue-engineering-aimed-human-dental-stem-cells
#4
Jennifer Adriane Dos Santos, Monica Talarico Duailibi, Durvanei Augusto Maria, Sonia Elisabete Alves de Lima Will, Paulo Cesar Simoes Silva, Ligia Ferreira Gomes, Silvio Eduardo Duailibi
Human dental stem cells (hDSC) have a potential for regenerative therapies and could differentiate in vitro into many tissues such as dentin, nerve and vascular endothelium. Gallus gallus domesticus developing fertilized egg, or chick embryo is an experimental model absent of xenografts rejection, largely employed in replacement of mammal species in scientific research and pre-clinical studies to evaluate angiogenesis and vasculogenesis, tissue differentiation, and embryonic development. This multiscale research deals with the homing and cell signaling effects of a standardized hDSC towards the receptor tissues of Gallus gallus domesticus in ovo...
November 21, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29160172/neural-differentiation-of-spheroids-derived-from-hipsc-msc-co-culture
#5
Liqing Song, Ang-Chen Tsai, Xuegang Yuan, Julie Bejoy, Sébastien Sart, Teng Ma, Yan Li
Organoids, the condensed 3-D tissues emerged at the early stage of organogenesis, are a promising approach to regenerate functional and vascularized organ mimics. While incorporation of heterotypic cell types such as human mesenchymal stem cells (hMSCs) and human induced pluripotent stem cells (hiPSCs) derived neural progenitors aid neural organ development, the interactions of secreted factors during neurogenesis have not been well understood. The objective of this study is to investigate the impact of the composition and structure of 3-D hybrid spheroids of hiPSCs and hMSCs on dorsal cortical differentiation and the secretion of extracellular matrices and trophic factors in vitro...
November 21, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28982292/promotion-of-myogenic-maturation-by-timely-application-of-electric-field-along-the-topographical-alignment
#6
Ung Hyun Ko, Sukhee Park, Hyunseung Bang, Mina Kim, Hyunjun Shin, Jennifer H Shin
Engineered muscular substitutes can restore the impaired muscle functions when integrated properly into the host tissue. To generate functional muscles with sufficient contractility at the site of transplant, the in vitro construction of fully differentiated muscle fibers would be desired. Many previous reports have identified either topographical alignment or electrical stimulation as an effective tool to promote myogenic differentiation. However, optimization of spatial and temporal arrangement of these two physical cues for better differentiation and maturation of skeletal muscles has not been investigated...
November 17, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28946792/calvarial-bone-regeneration-is-enhanced-by-sequential-delivery-of-fgf-2-and-bmp-2-from-layer-by-layer-coatings-with-a-biomimetic-calcium-phosphate-barrier-layer
#7
Gloria Gronowicz, Emily Jacobs, Tao Peng, Li Zhu, Marja Hurley, Liisa T Kuhn
A drug delivery coating for synthetic bone grafts has been developed to provide sequential delivery of multiple osteoinductive factors to better mimic aspects of the natural regenerative process. The coating is composed of a biomimetic calcium phosphate (bCaP) layer that is applied to a synthetic bone graft and then covered with a poly-l-Lysine/poly-l-Glutamic acid polyelectrolyte multilayer (PEM) film. Bone morphogenetic protein-2 (BMP-2) was applied before the coating process directly on the synthetic bone graft and then, bCaP-PEM was deposited followed by adsorption of fibroblast growth factor-2 (FGF-2) into the PEM layer...
November 13, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29130419/recapitulation-of-native-dermal-tissue-in-a-full-thickness-human-skin-model-using-human-collagens
#8
Arnout Mieremet, Marion Rietveld, Rianne van Dijk, Joke A Bouwstra, Abdoelwaheb El Ghalbzouri
OBJECTIVE: Full thickness skin models are comprised of a three dimensional dermal equivalent based on an animal derived collagen matrix that harbours fibroblasts and an epidermal equivalent formed by keratinocytes. The functionality of both equivalents is influenced by many factors, including extracellular matrix composition and resident cell type. Animal-derived collagens differ in amino acid composition and physico-chemical properties from human collagens. This composition could alter the functionality of the dermal equivalent and epidermal morphogenesis with the barrier formation in full thickness models (FTMs)...
November 12, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29105596/ureteral-reconstruction-in-goats-using-tissue-engineered-templates-and-subcutaneous-pre-implantation
#9
Paul K J D de Jonge, Marije Sloff, Heinz Peter Janke, Luuk R M Versteegden, Barbara B Kortmann, Robert P E de Gier, Paul J Geutjes, Egbert Oosterwijk, Wout Feitz
INTRODUCTION: Repair of long ureteral defects often requires long graft tissues and extensive surgery. This is associated with complications including a lack of suitable tissue and graft site morbidity. Tissue engineering may provide an attractive alternative to the autologous graft tissues. In this study, ureteral repair using (pre-implanted) tubular collagen-Vicryl templates was evaluated in a new goat model. MATERIALS AND METHODS: Tubular templates were prepared from tubularized Vicryl meshes and 0...
November 4, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29096582/peripheral-blood-plasma-clot-as-a-local-antimicrobial-drug-delivery-matrix
#10
Jan Gessmann, Dominik Seybold, Fahim Ayami, Elvira Peter, Hinnerk Baecker, Thomas Armin Schildhauer, Manfred Koeller
Platelet-free blood plasma clots were loaded either with antibiotics (vancomycin, gentamicin, or linezolid) at concentrations of 5-300 µg/ml or with silver ions (silver acetate) at concentrations of 3.3-129 µg/ml. The release of antibiotics or silver from the clot matrix was analyzed after repeated immersion of the plasma clots using reversed phase high-performance liquid chromatography (RP-HPLC) or atomic absorption spectroscopy (AAS). The antimicrobial activity was tested against Staphylococcus aureus, tissue cell compatibility was analyzed using human mesenchymal stem cells (hMSC)...
November 2, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29073831/pthrp-gradients-affect-the-progression-of-mesenchymal-stem-cell-chondrogenesis-and-hypertrophy
#11
Niamh Fahy, Oliver Gardner, Mauro Alini, Martin James Stoddart
INTRODUCTION: Mesenchymal stem cells (MSCs) are considered a promising cell source for cartilage repair strategies due to their chondrogenic differentiation potential. However, their in-vitro tendency to progress towards hypertrophy limits their clinical use. This unfavourable result may be due to the fact that MSCs used in tissue engineering approaches are all at the same developmental stage, and have lost crucial spatial and temporal signalling cues. In this study, we sought to investigate the effect of a spatial parathyroid hormone-related protein (PTHrP) signalling gradient on the chondrogenic differentiation of MSCs and progression to hypertrophy...
October 26, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29065776/phosphate-functional-groups-improve-opf-osteoconduction-and-bmp-2-osteoinductive-efficacy
#12
Maurits Geert Laurent Olthof, M Tryfonidou, Xifeng Liu, Behdad Pouran, Björn Meij, Wouter Dhert, Michael J Yaszemski, Lichun Lu, Jacqueline Alblas, Diederik H R Kempen
Off the shelf availability in large quantities, drug delivery functionality, and modifiable chemistry and mechanical properties makes synthetic polymers highly suitable candidates for bone grafting. However, most synthetic polymers lack the ability to support cell attachment, proliferation, migration and differentiation and ultimately tissue formation. Incorporating anionic peptides into the polymer that mimic acidic proteins, which contribute to biomineralization and cellular attachment, could enhance bone formation...
October 25, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28851253/pedicled-transplantation-of-axially-vascularized-bone-constructs-in-a-critical-size-femoral-defect
#13
Andreas Arkudas, Amelie Lipp, Gregor Buehrer, Isabel Arnold, Diana Dafinova, Andreas Brandl, Justus P Beier, Carolin Körner, Stefan Lyer, Christoph Alexiou, Ulrich Kneser, Raymund E Horch
INTRODUCTION: Axial vascularization represents a mandatory requirement for clinically applied larger scale vascularized bone grafts. The aim of this study was to combine the arteriovenous (AV) loop model in the rat with a critically sized femoral bone defect and to successfully transplant axially vascularized bone constructs into the defect. MATERIALS AND METHODS: In Groups A and C, an AV loop together with a clinically approved hydroxyapatite and beta-tricalcium phosphate (HA/β-TCP) matrix, mesenchymal stem cells, and recombinant human bone morphogenetic protein 2 were implanted into a newly designed porous titanium chamber with an integrated osteosynthesis plate in the thighs of rats, whereas in Groups B and D, the same matrix composition without AV loop and, in Group E, only the HA/β-TCP matrix were implanted...
October 25, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29054134/thymus-derived-mesenchymal-stem-cells-for-tissue-engineering-clinical-grade-cardiovascular-grafts
#14
Dominga Iacobazzi, Megan Swim, Ambra Albertario, Massimo Caputo, Mohamed T Ghorbel
Mesenchymal stem cells (MSCs) are attractive tools for regenerative medicine because of their multi-differentiation potential and immunomodulation capacity. In congenital heart defect surgical correction, replacement grafts lacking growth potential are commonly used. Tissue engineering promises to overcome the limitations of these grafts. In this study, we hypothesized that human thymus derived MSCs are a suitable tool to tissue engineer a living vascular graft with good integration and patency once implanted in vivo...
October 20, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29048241/nanofibrous-electrospun-hdecm-based-hybrid-scaffold-as-wound-dressing-for-reducing-scarring
#15
Tae Hee Kim, Youngmee Jung, Soo Hyun Kim
Produced via electrospinning, poly(l-lactide-co-caprolactone) (PLCL) membranes, which have a porous structure and are biodegradable, are of interest in various medical fields. The porous-structured electrospun membrane is particularly interesting because of several favorable properties: it exudes fluid from the wound, does not build up under the wound covering, and does not cause wound desiccation. Moreover, extracellular matrix (ECM)-based structures derived by tissue decellularization have application as engineered tissue scaffolds and as supports for cellular regeneration...
October 19, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28903624/repair-of-calvarial-bone-defect-using-jarid1a-knockdown-bone-mesenchymal-stem-cells-in-rats
#16
Yuan Deng, Tao Guo, Jipeng Li, Li Guo, Ping Gu, Xianqun Fan
Histone methylation is regarded as an important epigenetic event during stem cell differentiation. Jumonji AT-rich interactive domain 1A (Jarid1a) is a histone demethylase that specifically catalyzes demethylation of dimethyl or trimethyl histone H3K4me3, which is normally associated with transcriptionally active genes. Runt-related transcription factor 2 (Runx2) has been identified as a key transcription factor in the early stage of osteogenesis. A better understanding of this epigenetic mechanism that governs osteogenic differentiation of bone mesenchymal stem cells (BMSCs) can provide new insights into BMSC-based bone tissue engineering...
October 19, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29032745/strategic-directions-in-biomimetics-and-osteoinduction
#17
Pamela Habibovic
Strategic Directions in Biomimetics and Osteoinduction.
October 15, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28826347/osteogenic-potential-of-tauroursodeoxycholic-acid-as-an-alternative-to-rhbmp-2-in-a-mouse-spinal-fusion-model
#18
Byoung Ju Kim, Yoshie Arai, Eun-Mi Park, Sunghyun Park, Alvin Bello, In-Bo Han, Soo-Hong Lee
The non-union rate after lumbar spinal fusion is potentially as high as 48%. To support efficient bone regeneration, recombinant human bone morphogenetic protein-2 (rhBMP-2) is commonly used as it is regarded as the most potent bone-inducing molecule. However, recently, there have been increasing concerns on the use of rhBMP-2 such as serious complications, including seroma and heterotopic ossification, and the low quality of bone at the center of fusion mass. Thus, many studies were conducted to find and to develop a potential alternative to rhBMP-2...
October 12, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28756737/mimicking-the-biochemical-and-mechanical-extracellular-environment-of-the-endochondral-ossification-process-to-enhance-the-in-vitro-mineralization-potential-of-human-mesenchymal-stem-cells
#19
Fiona E Freeman, Jessica Schiavi, Meadhbh A Brennan, Peter Owens, Pierre Layrolle, Laoise M McNamara
Chondrogenesis and mechanical stimulation of the cartilage template are essential for bone formation through the endochondral ossification process in vivo. Recent studies have demonstrated that in vitro regeneration strategies that mimic these aspects separately, either chondrogenesis or mechanical stimulation, can promote mineralization to a certain extent both in vitro and in vivo. However, to date no study has sought to incorporate both the formation of the cartilage template and the application of mechanical stimulation simultaneously to induce osteogenesis...
October 12, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28726579/the-immunomodulatory-role-of-bmp-2-on-macrophages-to-accelerate-osteogenesis
#20
Fei Wei, Yinghong Zhou, Jing Wang, Changsheng Liu, Yin Xiao
Bone morphogenetic protein-2 (BMP-2) is one of the most frequently used osteogenic factors for osteogenesis. Macrophages, acting as both immune cells and osteoclast precursors, have an indispensable functional input during multiple stages of bone healing. This study aims to investigate the immunoregulatory role of BMP-2 on macrophages and the subsequent effects on osteogenesis. In the subcutaneous implantation study, gelatin sponge incorporated with 20 μg/mL BMP-2 rendered significantly enhanced macrophage infiltration compared with the gelatin sponge control...
October 12, 2017: Tissue Engineering. Part A
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