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Journal of Tissue Engineering

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https://www.readbyqxmd.com/read/28507726/adapting-tissue-engineered-in-vitro-cns-models-for-high-throughput-study-of-neurodegeneration
#1
Caitriona O'Rourke, Charlotte Lee-Reeves, Rosemary Al Drake, Grant Ww Cameron, A Jane Loughlin, James B Phillips
Neurodegenerative conditions remain difficult to treat, with the continuing failure to see therapeutic research successfully advance to clinical trials. One of the obstacles that must be overcome is to develop enhanced models of disease. Tissue engineering techniques enable us to create organised artificial central nervous system tissue that has the potential to improve the drug development process. This study presents a replicable model of neurodegenerative pathology through the use of engineered neural tissue co-cultures that can incorporate cells from various sources and allow degeneration and protection of neurons to be observed easily and measured, following exposure to neurotoxic compounds - okadaic acid and 1-methyl-4-phenylpyridinium...
January 2017: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/28491274/biomimetic-strategies-for-fracture-repair-engineering-the-cell-microenvironment-for-directed-tissue-formation
#2
Wollis J Vas, Mittal Shah, Rawiya Al Hosni, Helen C Owen, Scott J Roberts
Complications resulting from impaired fracture healing have major clinical implications on fracture management strategies. Novel concepts taken from developmental biology have driven research strategies towards the elaboration of regenerative approaches that can truly harness the complex cellular events involved in tissue formation and repair. Advances in polymer technology and a better understanding of naturally derived scaffolds have given rise to novel biomaterials with an increasing ability to recapitulate native tissue environments...
January 2017: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/28228933/vascularization-and-innervation-of-slits-within-polydimethylsiloxane-sheets-in-the-subcutaneous-space-of-athymic-nude-mice
#3
Rachel E Gurlin, Mark T Keating, Shiri Li, Jonathan Rt Lakey, Sébastien de Feraudy, Bhupinder S Shergill, Elliot L Botvinick
Success of cell therapy in avascular sites will depend on providing sufficient blood supply to transplanted tissues. A popular strategy of providing blood supply is to embed cells within a functionalized hydrogel implanted within the host to stimulate neovascularization. However, hydrogel systems are not always amenable for removal post-transplantation; thus, it may be advantageous to implant a device that contains cells while also providing access to the circulation so retrieval is possible. Here we investigate one instance of providing access to a vessel network, a thin sheet with through-cut slits, and determine if it can be vascularized from autologous materials...
January 2017: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/28228932/a-clinically-relevant-in-vivo-model-for-the-assessment-of-scaffold-efficacy-in-abdominal-wall-reconstruction
#4
Jeffrey Cy Chan, Krishna Burugapalli, Yi-Shiang Huang, John L Kelly, Abhay Pandit
An animal model that allows for assessment of the degree of stretching or contraction of the implant area and the in vivo degradation properties of biological meshes is required to evaluate their performance in vivo. Adult New Zealand rabbits underwent full thickness subtotal unilateral rectus abdominis muscle excision and were reconstructed with the non-biodegradable Peri-Guard(®), Prolene(®) or biodegradable Surgisis(®) meshes. Following 8 weeks of recovery, the anterior abdominal wall tissue samples were collected for measurement of the implant dimensions...
January 2017: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/28228931/tubular-organ-epithelialisation
#5
REVIEW
Rhea Saksena, Chuanyu Gao, Mathew Wicox, Achala de Mel
Hollow, tubular organs including oesophagus, trachea, stomach, intestine, bladder and urethra may require repair or replacement due to disease. Current treatment is considered an unmet clinical need, and tissue engineering strategies aim to overcome these by fabricating synthetic constructs as tissue replacements. Smart, functionalised synthetic materials can act as a scaffold base of an organ and multiple cell types, including stem cells can be used to repopulate these scaffolds to replace or repair the damaged or diseased organs...
January 2016: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/28228930/optimal-conjugation-of-catechol-group-onto-hyaluronic-acid-in-coronary-stent-substrate-coating-for-the-prevention-of-restenosis
#6
Eugene Lih, Seul Gi Choi, Dong June Ahn, Yoon Ki Joung, Dong Keun Han
Although endovascular stenting has been used as an interventional therapy to treat cardio- and cerebro-vascular diseases, it is associated with recurrent vascular diseases following stent thrombosis and in-stent restenosis. In this study, a metallic stent was coated with dopamine-conjugated hyaluronic acid with different ratios of catechol group to improve hemocompatibility and re-endothelialization. Especially, we were interested in how much amount of catechol group is appropriate for the above-mentioned purposes...
January 2016: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/28228929/decellularized-bone-matrix-grafts-for-calvaria-regeneration
#7
Dong Joon Lee, Shannon Diachina, Yan Ting Lee, Lixing Zhao, Rui Zou, Na Tang, Han Han, Xin Chen, Ching-Chang Ko
Decellularization is a promising new method to prepare natural matrices for tissue regeneration. Successful decellularization has been reported using various tissues including skin, tendon, and cartilage, though studies using hard tissue such as bone are lacking. In this study, we aimed to define the optimal experimental parameters to decellularize natural bone matrix using 0.5% sodium dodecyl sulfate and 0.1% NH4OH. Then, the effects of decellularized bone matrix on rat mesenchymal stem cell proliferation, osteogenic gene expression, and osteogenic differentiations in a two-dimensional culture system were investigated...
January 2016: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/27994846/hybrid-polyurea-elastomers-with-enzymatic-degradation-and-tunable-mechanical-properties
#8
Nicholas A Sears, Geraldine Pena-Galea, Stacy N Cereceres, Elizabeth Cosgriff-Hernandez
Herein, we report on the synthesis and characterization of enzymatically labile polyureas for use as a tissue-engineered ligament scaffold. Polyureas were selected due to their excellent tensile properties, fatigue resistance, and highly tunable nature. Incorporation of a collagenase-sensitive peptide into the backbone of the polyurea provided a means to confer cell-responsive degradation to the synthetic polymer. Chemical, morphological, and mechanical testing were used to confirm incorporation of the peptide and characterize polyurea films...
January 2016: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/27928496/bioactive-mesoporous-wollastonite-particles-for-bone-tissue-engineering
#9
S Saravanan, Nagarajan Selvamurugan
The current investigation was aimed at identifying the role of mesoporous wollastonite particles on the healing of rat tibial bone defect. The bone defect was created with a 3-mm-diameter dental drill, and it was filled with mesoporous wollastonite particles. After second and fourth weeks of filling treatments, it was found that mesoporous wollastonite particles promoted bone formation as evidenced by X-ray, histological, scanning electron microscope, and energy-dispersive spectra studies. X-ray study showed the closure of drill hole as seen by high-dense radio-opacity image...
January 2016: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/27895888/in-situ-formation-of-poly-vinyl-alcohol-heparin-hydrogels-for-mild-encapsulation-and-prolonged-release-of-basic-fibroblast-growth-factor-and-vascular-endothelial-growth-factor
#10
Justine J Roberts, Brooke L Farrugia, Rylie A Green, Jelena Rnjak-Kovacina, Penny J Martens
Heparin-based hydrogels are attractive for controlled growth factor delivery, due to the native ability of heparin to bind and stabilize growth factors. Basic fibroblast growth factor and vascular endothelial growth factor are heparin-binding growth factors that synergistically enhance angiogenesis. Mild, in situ encapsulation of both basic fibroblast growth factor and vascular endothelial growth factor and subsequent bioactive dual release has not been demonstrated from heparin-crosslinked hydrogels, and the combined long-term delivery of both growth factors from biomaterials is still a major challenge...
January 2016: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/27766141/multi-compartmental-biomaterial-scaffolds-for-patterning-neural-tissue-organoids-in-models-of-neurodevelopment-and-tissue-regeneration
#11
Richard J McMurtrey
Biomaterials are becoming an essential tool in the study and application of stem cell research. Various types of biomaterials enable three-dimensional culture of stem cells, and, more recently, also enable high-resolution patterning and organization of multicellular architectures. Biomaterials also hold potential to provide many additional advantages over cell transplants alone in regenerative medicine. This article describes novel designs for functionalized biomaterial constructs that guide tissue development to targeted regional identities and structures...
January 2016: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/27757220/clinical-safety-and-efficacy-of-implantation-of-octacalcium-phosphate-collagen-composites-in-tooth-extraction-sockets-and-cyst-holes
#12
Tadashi Kawai, Yuji Tanuma, Keiko Matsui, Osamu Suzuki, Tetsu Takahashi, Shinji Kamakura
It was demonstrated that octacalcium phosphate collagen composite achieved notable bone regeneration in bone defects in preclinical studies. On the basis of the research results, an investigator-initiated exploratory clinical trial was conducted after approval from a local Institutional Review Board. This clinical study was performed as a single-arm non-randomized intervention study. Octacalcium phosphate collagen composite was implanted into a total of 10 cases of alveolar bone defects after tooth extractions and cystectomy...
January 2016: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/27746893/the-regulation-of-bone-turnover-in-ameloblastoma-using-an-organotypic-in-vitro-co-culture-model
#13
Tuula M Eriksson, Richard M Day, Stefano Fedele, Vehid M Salih
Ameloblastoma is a rare, odontogenic neoplasm with benign histopathology, but extensive, local infiltrative capacity through the bone tissue it originates in. While the mechanisms of ameloblastoma invasion through the bone and bone absorption are largely unknown, recent investigations have indicated a role of the osteoprotegerin/receptor activator of nuclear factor kappa-B ligand regulatory mechanisms. Here, we present results obtained using a novel in vitro organotypic tumour model, which we have developed using tissue engineering techniques...
January 2016: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/27738510/erythropoietin-stimulation-of-human-adipose-tissue-for-therapeutic-refilling-releases-protective-cytokines
#14
Maurizio Sabbatini, Michela Bosetti, Alessia Borrone, Liah Moalem, Antonio Taveggia, Giovanni Verna, Mario Cannas
Apoptosis and inflammatory processes may be at the basis of reducing graft survival. Erythropoietin is a tissue-protective hormone with pleiotropic potential, and it interferes with the activities of pro-inflammatory cytokines and stimulates healing following injury, preventing destruction of tissue surrounding the injury site. It may represent a useful tool to increase the autograft integration. Through the use of multipanel kit cytokine analysis we have detected the cytokines secreted by human tissue adipose mass seeded in culture following withdrawal by Coleman's modified technique in three groups: control, after lipopolysaccharides stimulation and after erythropoietin stimulation...
January 2016: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/27733898/cell-mediated-remodeling-of-biomimetic-encapsulating-hydrogels-triggered-by-adipogenic-differentiation-of-adipose-stem-cells
#15
Tracy N Clevenger, Gabriel Luna, Daniel Boctor, Steven K Fisher, Dennis O Clegg
One of the most common regenerative therapies is autologous fat grafting, which frequently suffers from unexpected volume loss. One approach is to deliver adipose stem cells encapsulated in the engineered hydrogels supportive of cell survival, differentiation, and integration after transplant. We describe an encapsulating, biomimetic poly(ethylene)-glycol hydrogel, with embedded peptides for attachment and biodegradation. Poly(ethylene)-glycol hydrogels containing an Arg-Gly-Asp attachment sequence and a matrix metalloprotease 3/10 cleavage site supported adipose stem cell survival and showed remodeling initiated by adipogenic differentiation...
January 2016: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/27579159/mesenchymal-stem-cells-from-cortical-bone-demonstrate-increased-clonal-incidence-potency-and-developmental-capacity-compared-to-their-bone-marrow-derived-counterparts
#16
Daniel Blashki, Matthew B Murphy, Mauro Ferrari, Paul J Simmons, Ennio Tasciotti
In this study, we show that matrix dense cortical bone is the more potent compartment of bone than bone marrow as a stromal source for mesenchymal stem cells as isolated from adult rats. Lineage-depleted cortical bone-mesenchymal stem cells demonstrated >150-fold enrichment of colony forming unit-fibroblasts per cell incidence. compared to lineage-depleted bone marrow-mesenchymal stem cells, corresponding to a 70-fold increase in absolute recovered colony forming unit-fibroblasts. The composite phenotype Lin(-)/CD45(-)/CD31(-)/VLA-1(+)/Thy-1(+) enriched for clonogenic mesenchymal stem cells solely from cortical bone-derived cells from which 70% of clones spontaneously differentiated into all lineages of bone, cartilage, and adipose...
January 2016: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/27516850/a-recapitulative-three-dimensional-model-of-breast-carcinoma-requires-perfusion-for-multi-week-growth
#17
Kayla F Goliwas, Lauren E Marshall, Evette L Ransaw, Joel L Berry, Andra R Frost
Breast carcinomas are complex, three-dimensional tissues composed of cancer epithelial cells and stromal components, including fibroblasts and extracellular matrix. In vitro models that more faithfully recapitulate this dimensionality and stromal microenvironment should more accurately elucidate the processes driving carcinogenesis, tumor progression, and therapeutic response. Herein, novel in vitro breast carcinoma surrogates, distinguished by a relevant dimensionality and stromal microenvironment, are described and characterized...
January 2016: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/27493716/multipotent-adult-progenitor-cells-on-an-allograft-scaffold-facilitate-the-bone-repair-process
#18
Amanda LoGuidice, Alison Houlihan, Robert Deans
Multipotent adult progenitor cells are a recently described population of stem cells derived from the bone marrow stroma. Research has demonstrated the potential of multipotent adult progenitor cells for treating ischemic injury and cardiovascular repair; however, understanding of multipotent adult progenitor cells in orthopedic applications remains limited. In this study, we evaluate the osteogenic and angiogenic capacity of multipotent adult progenitor cells, both in vitro and loaded onto demineralized bone matrix in vivo, with comparison to mesenchymal stem cells, as the current standard...
January 2016: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/27493715/methods-for-culturing-retinal-pigment-epithelial-cells-a-review-of-current-protocols-and-future-recommendations
#19
REVIEW
Aaron H Fronk, Elizabeth Vargis
The retinal pigment epithelium is an important part of the vertebrate eye, particularly in studying the causes and possible treatment of age-related macular degeneration. The retinal pigment epithelium is difficult to access in vivo due to its location at the back of the eye, making experimentation with age-related macular degeneration treatments problematic. An alternative to in vivo experimentation is cultivating the retinal pigment epithelium in vitro, a practice that has been going on since the 1970s, providing a wide range of retinal pigment epithelial culture protocols, each producing cells and tissue of varying degrees of similarity to natural retinal pigment epithelium...
January 2016: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/27493714/osteogenic-differentiation-of-human-mesenchymal-stem-cells-promotes-mineralization-within-a-biodegradable-peptide-hydrogel
#20
Luis A Castillo Diaz, Mohamed Elsawy, Alberto Saiani, Julie E Gough, Aline F Miller
An attractive strategy for the regeneration of tissues has been the use of extracellular matrix analogous biomaterials. Peptide-based fibrillar hydrogels have been shown to mimic the structure of extracellular matrix offering cells a niche to undertake their physiological functions. In this study, the capability of an ionic-complementary peptide FEFEFKFK (F, E, and K are phenylalanine, glutamic acid, and lysine, respectively) hydrogel to host human mesenchymal stem cells in three dimensions and induce their osteogenic differentiation is demonstrated...
January 2016: Journal of Tissue Engineering
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