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https://www.readbyqxmd.com/read/29149727/surface-modification-of-electrospun-poly-l-lactic-acid-scaffolds-by-reactive-magnetron-sputtering
#1
E N Bolbasov, P V Maryin, K S Stankevich, A I Kozelskaya, E V Shesterikov, Yu I Khodyrevskaya, M V Nasonova, D K Shishkova, Yu A Kudryavtseva, Y G Anissimov, S I Tverdokhlebov
In this study, we modified the surface of bioresorbable electrospun poly-(l-lactic) acid (PLLA) scaffolds by reactive magnetron sputtering of a titanium target under a nitrogen atmosphere. We examined the influence of the plasma treatment time on the structure and properties of electrospun PLLA scaffolds using SEM, XRF, FTIR, XRD, optical goniometry, and mechanical testing. It was observed that the coating formed did not change physicomechanical properties of electrospun PLLA scaffolds and simultaneously, increased their hydrophilicity...
November 12, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29149506/integrating-soft-and-hard-tissues-via-interface-tissue-engineering
#2
REVIEW
Sahishnu Patel, Jon-Michael Caldwell, Stephen B Doty, William N Levine, Scott Rodeo, Louis J Soslowsky, Stavros Thomopoulos, Helen H Lu
The enthesis, or interface between bone and soft tissues such as ligament and tendon, is prone to injury and often does not heal post-surgical intervention. Interface tissue engineering represents an integrative strategy for regenerating the native enthesis by functionally connecting soft and hard tissues and thereby improving clinical outcome. This review focuses on integrative and cell-instructive scaffold designs that target the healing of the two most commonly injured soft tissue-bone junctions: the tendon-bone interface (e...
November 17, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29148982/a-dentin-derived-hydrogel-bioink-for-3d-printing-of-cell-laden-scaffolds-for-regenerative-dentistry
#3
Avathamsa Athirasala, Anthony Tahayeri, Greeshma Thrivikraman, Cristiane Miranda Franca, Nelson Monteiro, Victor Tran, Jack Ferracane, Luiz Bertassoni
Recent studies in tissue engineering have adopted extracellular matrix (ECM) derived scaffolds as natural and cytocompatible microenvironments for tissue regeneration. The dentin matrix, specifically, has been shown to be associated with a host of soluble and insoluble signaling molecules that can promote odontogenesis. Here, we have developed a novel bioink, blending printable alginate (3% w/v) hydrogels with the soluble and insoluble fractions of the dentin matrix. We have optimized the printing parameters and the concentrations of the individual components of the bioink for print accuracy, cell viability and odontogenic potential...
November 17, 2017: Biofabrication
https://www.readbyqxmd.com/read/29148806/discovery-of-tropifexor-ljn452-a-highly-potent-non-bile-acid-fxr-agonist-for-the-treatment-of-cholestatic-liver-diseases-and-nonalcoholic-steatohepatitis-nash
#4
David C Tully, Paul V Rucker, Donatella Chianelli, Jennifer Williams, Agnes Vidal, Phil B Alper, Daniel Mutnick, Badry Bursulaya, James Schmeits, Xiangdong Wu, Dingjiu Bao, Jocelyn Zoll, Young Kim, Todd Groessl, Peter McNamara, H Martin Seidel, Valentina Molteni, Bo Liu, Andrew Phimister, Sean B Joseph, Bryan Laffitte
The farnesoid X receptor (FXR) is a nuclear receptor that acts as a master regulator of bile acid metabolism and signaling. Activation of FXR inhibits bile acid synthesis and increases bile acid conjugation, transport, and excretion, thereby protecting the liver from the harmful effects of bile accumulation, leading to considerable interest in FXR as a therapeutic target for the treatment of cholestasis and non-alcoholic steatohepatitis. We identified a novel series of highly potent non-bile acid FXR agonists that introduce a bicyclic nortropine-substituted benzothiazole carboxylic acid moiety onto a trisubstituted isoxazole scaffold...
November 16, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29148704/electrospun-poly-3-hydroxybutyrate-co-4-hydroxybutyrate-graphene-oxide-scaffold-enhanced-properties-and-promoted-in-vivo-bone-repair-in-rats
#5
Tengfei Zhou, Guo Li, Shiyu Lin, Taoran Tian, Quanquan Ma, Qi Zhang, Sirong Shi, Changyue Xue, Wenjuan Ma, Xiaoxiao Cai, Yunfeng Lin
Bone tissue engineering emerges as an advantageous technique to achieve tissue regeneration. Scaffolds for it must present excellent biomechanical properties where bare polymers poorly perform. Development for new biomaterials with high osteogenic capacity is urgently pursued. In this study, an electrospun poly(3-hydroxybutyrate-co-4-hydroxybutyrate/graphene oxide (P34HB/GO) nanofibrous scaffold is successfully fabricated and characterized. The effects of GO amount on scaffold morphology, biomechanical properties, and cellular behaviors are investigated...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29148548/acrylate-based-materials-for-heart-valve-scaffold-engineering
#6
Rosaria Santoro, Seshasailam Venkateswaran, Francesco Amadeo, Rong Zhang, Maura Brioschi, Anthony Callanan, Marco Agrifoglio, Cristina Banfi, Mark Bradley, Maurizio Pesce
Calcific aortic valve disease (CAVD) is the most frequent cardiac valve pathology. Its standard treatment consists of surgical replacement either with mechanical (metal made) or biological (animal tissue made) valve prostheses, both of which have glaring deficiencies. In the search for novel materials to manufacture artificial valve tissue, we have conducted a high-throughput screening with subsequent up-scaling to identify non-degradable polymer substrates that promote valve interstitial cells (VICs) adherence/growth and, at the same time, prevent their evolution toward a pro-calcific phenotype...
November 17, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/29147820/cue-signal-response-analysis-in-3d-chondrocyte-scaffolds-with-anabolic-stimuli
#7
Michael Neidlin, Antonion Korcari, Giorgos Macheras, Leonidas G Alexopoulos
Articular cartilage is an avascular connective tissue responsible for bearing loads. Cell signaling plays a central role in cartilage homeostasis and tissue engineering by directing chondrocytes to synthesize/degrade the extracellular matrix or promote inflammatory responses. The aim of this paper was to investigate anabolic, catabolic and inflammatory pathways of well-known and underreported anabolic stimuli in 3D chondrocyte cultures and connect them to diverse cartilage responses including matrix regeneration and cell communication...
November 16, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29147681/crimped-nanofibrous-biomaterials-mimic-microstructure-and-mechanics-of-native-tissue-and-alter-strain-transfer-to-cells
#8
Spencer E Szczesny, Tristan P Driscoll, Hsiao-Yun Tseng, Pang-Ching Liu, Su-Jin Heo, Robert L Mauck, Pen-Hsiu G Chao
To fully recapitulate tissue microstructure and mechanics, fiber crimping must exist within biomaterials used for tendon/ligament engineering. Existing crimped nanofibrous scaffolds produced via electrospinning are dense materials that prevent cellular infiltration into the scaffold interior. In this study, we used a sacrificial fiber population to increase the scaffold porosity and evaluated the effect on fiber crimping. We found that increasing scaffold porosity increased fiber crimping and ensured that the fibers properly uncrimped as the scaffolds were stretched by minimizing fiber-fiber interactions...
November 13, 2017: ACS Biomaterials Science & Engineering
https://www.readbyqxmd.com/read/29147489/the-effect-of-platelet-rich-plasma-on-human-mesenchymal-stem-cell-induced-bone-regeneration-of-canine-alveolar-defects-with-calcium-phosphate-based-scaffolds
#9
Reihaneh Shafieian, Maryam Moghaddam Matin, Amin Rahpeyma, Alireza Fazel, Hamideh Salari Sedigh, Ariane Sadr-Nabavi, Halimeh Hassanzadeh, Alireza Ebrahimzadeh-Bideskan
Objectives: Autologous bone transplantation known as the "gold standard" to reconstruction of osseous defects has known disadvantages. This study was designed to explore the effects of hydroxy-apatite/tricalcium-phosphate (HA/TCP) and platelet-rich plasma (PRP) on the osteogenesis ability of human adipose-derived mesenchymal stem cells (hAdMSCs) in vitro and in vivo. Materials and Methods: hAdMSCs were incubated with HA/TCP granules and/or PRP in vitro and then, cell proliferation and differentiation was assessed by MTT assay, AZR S staining and SEM examination...
October 2017: Iranian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/29145811/genome-wide-analysis-of-the-auxin-indoleacetic-acid-aux-iaa-gene-family-in-allotetraploid-rapeseed-brassica-napus-l
#10
Haitao Li, Bo Wang, Qinghua Zhang, Jing Wang, Graham J King, Kede Liu
BACKGROUND: Auxin/Indoleacetic acid (Aux/IAA) genes participate in the auxin signaling pathway and play key roles in plant growth and development. Although the Aux/IAA gene family has been identified in many plants, within allotetraploid Brassica napus little is known. RESULTS: In this study, a total of 119 Aux/IAA genes were found in the genome of B. napus. They were distributed non-randomly across all 19 chromosomes and other non-anchored random scaffolds, with a symmetric distribution in the A and C subgenomes...
November 16, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/29144589/-sphingosine-1-phosphate-immobilized-on-nanotopographical-scaffolds-improve-myogenic-differentiation
#11
Min Suk Lee, Hee Seok Yang
The skeletal muscle consists of highly aligned dense cables of collagen fibers with nanometer feature size to support muscle fibers. The skeletal myocyte can be greatly affected to differentiate by their surrounding topographical structure. To improve myogenic differentiation, we fabricated cell culture platform that sphingosine-1-phosphate (S1P) which regulated myocyte behavior was immobilized on a biomimetic nanopatterned polyurethaneacrylate (PUA) substrate using 3,4-dihydroxyphenylalanine (L-DOPA) for providing topographical and biological cues synergistically...
November 16, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/29143781/biological-properties-of-low-toxic-plga-and-plga-phb-fibrous-nanocomposite-scaffolds-for-osseous-tissue-regeneration-evaluation-of-potential-bioactivity
#12
Boguslawa Żywicka, Izabella Krucińska, Jerzy Garcarek, Maria Szymonowicz, Agnieszka Komisarczyk, Zbigniew Rybak
Abstracts: The aim of the study was to evaluate the biocompatibility and bioactivity of two new prototype implants for bone tissue regeneration made from biodegradable fibrous materials. The first is a newly developed poly(l-lactide-co-glycolide), (PLGA), and the second is a blend of PLGA with synthetic poly([R,S]-3-hydroxybutyrate) (PLGA/PHB). The implant prototypes comprise PLGA or PLGA/PHB nonwoven fabrics with designed pore structures to create the best conditions for cell proliferation. The bioactivity of the proposed implants was enhanced by introducing a hydroxyapatite material and a biologically active agent, namely, growth factor IGF1, encapsulated in calcium alginate microspheres...
October 28, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29143524/injectable-shear-thinning-caso4-fgf-18-incorporated-chitin-plga-hydrogels-enhances-bone-regeneration-in-mice-cranial-bone-defect-model
#13
Sivashanmugam Amirthalingam, Pornkawee Charoenlarp, Sankar Deepthi, ArunKumar Rajendran, Shantikumar V Nair, Sachiko Iseki, Rangasamy Jayakumar
For craniofacial bone regeneration, shear thinning injectable hydrogels are favoured over conventional scaffolds due to their improved defect margin adaptability, easier handling and ability to be injected manually into deeper tissues. The most accepted method, after autografting, is the use of recombinant human BMP-2; however, complications such as inter-individual variations, edema, and poor cost-efficiency in supraphysiological doses have been reported. The endogenous synthesis of BMP-2 is desirable, and a molecule which induces this is FGF-18 since it can up-regulate the BMP-2 expression and positively modulate other osteogenic genes...
November 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29142062/the-serine-protease-inhibitor-neuroserpin-is-required-for-normal-synaptic-plasticity-and-regulates-learning-and-social-behavior
#14
Rebecca Reumann, Ricardo Vierk, Lepu Zhou, Frederice Gries, Vanessa Kraus, Julia Mienert, Eva Romswinkel, Fabio Morellini, Isidre Ferrer, Chiara Nicolini, Margaret Fahnestock, Gabriele Rune, Markus Glatzel, Giovanna Galliciotti
The serine protease inhibitor neuroserpin regulates the activity of tissue-type plasminogen activator (tPA) in the nervous system. Neuroserpin expression is particularly prominent at late stages of neuronal development in most regions of the central nervous system (CNS), whereas it is restricted to regions related to learning and memory in the adult brain. The physiological expression pattern of neuroserpin, its high degree of colocalization with tPA within the CNS, together with its dysregulation in neuropsychiatric disorders, suggest a role in formation and refinement of synapses...
December 2017: Learning & Memory
https://www.readbyqxmd.com/read/29141686/anisotropic-m%C3%A3-ller-glial-scaffolding-supports-a-multiplex-lattice-mosaic-of-photoreceptors-in-zebrafish-retina
#15
Mikiko Nagashima, Jeremy Hadidjojo, Linda K Barthel, David K Lubensky, Pamela A Raymond
BACKGROUND: The multiplex, lattice mosaic of cone photoreceptors in the adult fish retina is a compelling example of a highly ordered epithelial cell pattern, with single cell width rows and columns of cones and precisely defined neighbor relationships among different cone types. Cellular mechanisms patterning this multiplex mosaic are not understood. Physical models can provide new insights into fundamental mechanisms of biological patterning. In earlier work, we developed a mathematical model of photoreceptor cell packing in the zebrafish retina, which predicted that anisotropic mechanical tension in the retinal epithelium orients planar polarized adhesive interfaces to align the columns as cone photoreceptors are generated at the retinal margin during post-embryonic growth...
November 15, 2017: Neural Development
https://www.readbyqxmd.com/read/29140567/human-adipose-derived-stromal-cell-isolation-methods-and-use-in-osteogenic-and-adipogenic-in-vivo-applications
#16
Elizabeth Brett, Ruth Tevlin, Adrian McArdle, Eun Young Seo, Charles K F Chan, Derrick C Wan, Michael T Longaker
Adipose tissue represents an abundant and easily accessible source of multipotent cells, which may serve as excellent building blocks for tissue engineering. This article presents a newly described protocol for isolating adipose-derived stromal cells (ASCs) from human lipoaspirate, compared to the standard protocol for harvesting ASCs established in 2001. Human ASC isolation is performed using two methods, and resultant cells are compared through cell yield, cell viability, cell proliferation and regenerative potential...
November 15, 2017: Current Protocols in Stem Cell Biology
https://www.readbyqxmd.com/read/29140252/generation-of-genipin-cross-linked-fibrin-agarose-hydrogels-tissue-like-models-for-tissue-engineering-applications
#17
Fernando Campos, Ana Belen Bonhame-Espinosa, Gerson Vizcaino, Ismael Angel Rodriguez, Daniel Durand-Herrera, Modesto T Lopez-Lopez, Indalecio Sánchez-Montesinos, Miguel Alaminos, María Del Carmen Sánchez-Quevedo, Víctor Carriel
Generation of biomimetic and biocompatible artificial tissues is the basic research objective for tissue engineering (TE). In this sense, the biofabrication of scaffolds that resemble the tissues' extracellular matrix (ECM) is an essential aim in this field. Uncompressed and nanostructured fibrin-agarose hydrogels (FAH and NFAH respectively) emerged as promising scaffold in TE, but its structure and biomechanical properties must be improved in order to broad their TE applications. Here we generated and characterized novel membrane-like models with increased structural and biomechanical properties based on the chemical cross-linking of FAH and NFAH with genipin (GP at 0...
November 15, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/29140181/rational-design-of-a-high-strength-bone-scaffold-platform-based-on-in-situ-hybridization-of-bacterial-cellulose-nano-hydroxyapatite-framework-and-silk-fibroin-reinforcing-phase
#18
Pei Jiang, Jiabing Ran, Pan Yan, Lingyue Zheng, Xinyu Shen, Hua Tong
Bacterial cellulose/hydroxyapatite (BC/HAp) composite had favourable bioaffinity but its poor mechanical strength limited its widespread applications in bone tissue engineering (BTE). Silk fibroin, which possesses special crystalline structure, has been widely used as organic reinforcing material, and different SFs have different amino acid sequences, which exhibit different bioaffinity and mechanical properties. In this regard, bacterial cellulose-Antheraea yamamai silk fibroin/hydroxyapatite(BC-AYSF/HAp), bacterial cellulose-Bombyx mori silk fibroin/hydroxyapatite(BC-BMSF/HAp), and BC/HAp nano-composites were synthesized via a novel in situ hybridization method...
November 15, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/29139602/cell-yield-chondrogenic-potential-and-regenerated-cartilage-type-of-chondrocytes-derived-from-ear-nasoseptal-and-costal-cartilage
#19
Aijuan He, Huitang Xia, Kaiyan Xiao, Tingting Wang, Yu Liu, Jixin Xue, Dan Li, Shengjian Tang, Fangjun Liu, Xiaoyun Wang, Wenjie Zhang, Wei Liu, Yilin Cao, Guangdong Zhou
Functional reconstruction of large cartilage defects in subcutaneous sites remains clinically challenging because of limited donor cartilage. Tissue engineering is a promising and widely accepted strategy for cartilage regeneration. To date however, this strategy has not achieved a significant breakthrough in clinical translation owing to a lack of detailed pre-clinical data on cell yield and functionality of clinically applicable chondrocytes. To address this issue, the current study investigated the initial cell yield, proliferative potential, chondrogenic capacity, and regenerated cartilage-type of human chondrocytes derived from auricular (AU), nasoseptal (NS), and costal (CO) cartilage using a scaffold-free cartilage regeneration model (cartilage sheet)...
November 15, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29138282/trajectory-analysis-unveils-reelin-s-role-in-the-directed-migration-of-granule-cells-in-the-dentate-gyrus
#20
Shaobo Wang, Bianka Brunne, Shanting Zhao, Xuejun Chai, Jiawei Li, Jeremie Lau, Antonio Virgilio Failla, Bernd Zobiak, Mirjam Sibbe, Gary L Westbrook, David Lutz, Michael Frotscher
Reelin controls neuronal migration and layer formation. Previous studies in reeler mice deficient in Reelin focused on the result of the developmental process in fixed tissue sections. It has remained unclear whether Reelin affects the migratory process, migration directionality or migrating neurons guided by the radial glial scaffold. Moreover, Reelin has been regarded as an attractive signal, since newly generated neurons migrate toward the Reelin-containing marginal zone. Conversely, Reelin might be a stop signal, since migrating neurons in reeler, but not in wild-type mice, invade the marginal zone...
November 14, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
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