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Journal of Biomedical Materials Research. Part A

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https://www.readbyqxmd.com/read/27886664/degradation-behaviors-of-geometric-cues-and-mechanical-properties-in-a-3d-scaffold-for-tendon-repair
#1
Yang Wu, Yoke San Wong, Jerry Ying Hsi Fuh
A three-dimensional (3D) scaffold fabricated via electrohydrodynamic jet printing (E-jetting) and thermally uniaxial stretching, has been developed for tendon tissue regeneration in our previous study. In this study, more in-depth biological test showed that the aligned cell morphology guided by the anisotropic geometries of the 3D tendon scaffolds, leading to up-regulated tendious gene expression including collagen type I, decorin, tenascin-C and biglycan, as compared to the electrospun scaffolds. Given the importance of geometric cues to the biological function of the scaffolds, the degradation behaviors of the 3D scaffolds were investigated...
November 25, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27886662/osteoblast-response-to-the-surface-topography-of-hydroxyapatite-two-dimensional-films
#2
Gai Yang, Zili Liu, Yuming Guo, Jie Zhang, Han Li, Weike Shi, Jing Feng, Kui Wang, Lin Yang
In the current study, three hydroxyapatite two-dimensional films with similar wettability but different topological roughness have been prepared through a facile one-step method using hydrated polylactic acid discs as substrates. The results indicated that the protein adsorption capabilities of the hydroxyapatite two-dimensional films and the proliferation of osteoblast cells on the as-prepared films increased obviously with the increase of the films' roughness. These reveal that the cellular responses to two-dimensional materials can be efficiently tuned by easily adjusting the topological roughness...
November 25, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27885781/cellular-response-of-osteoblasts-to-low-modulus-ti-24nb-4zr-8sn-alloy-mesh-structure
#3
K C Nune, R D K Misra, S J Li, Y L Hao, R Yang
Titanium alloys (Ti-6Al-4V and Ti-6Al-7Nb) are widely used for implants, which are characterized by high elastic modulus (∼110 GPa) with (α + β) structure and that may induce undesirable stress shielding effect and immune responses associated with the presence of toxic elements. In this regard, we have combined the attributes of a new alloy design and the concept of additive manufacturing to fabricate 3D scaffolds with an interconnected porous structure. The new alloy is a β-type Ti-24Nb-4Zr-8Sn (Ti2448) alloy with significantly reduced modulus...
November 25, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27874253/combined-delivery-of-fgf-2-tgf-%C3%AE-1-and-adipose-derived-stem-cells-from-an-engineered-periosteum-to-a-critical-sized-mouse-femur-defect
#4
Raimundo Romero, John K Travers, Emilie Asbury, Attie Pennybaker, Laura Chubb, Ruth Rose, Nicole P Ehrhart, Matt J Kipper
Critical-sized long bone defects suffer from complications including impaired healing and non-union due to substandard healing and integration of devitalized bone allograft. Removal of the periosteum contributes to the limited healing of bone allografts. Restoring a periosteum on bone allografts may provide improved allograft healing and integration. This article reports a polysaccharide-based tissue engineered periosteum that delivers basic fibroblast growth factor (FGF-2), transforming growth factor-β1 (TGF-β1), and adipose-derived mesenchymal stem cells (ASCs) to a critical-sized mouse femur defect...
November 22, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27860234/probing-the-response-of-human-osteoblasts-following-exposure-to-sympathetic-neuron-like-pc-12-cells-in-a-3d-co-culture-model
#5
Josh Erndt-Marino, Mariah S Hahn
Understanding the capacity of the sympathetic nervous system (SNS) to regulate bone homeostasis has implications for a number of metabolic diseases and may help establish connections between certain neurological conditions and bone quality. The goal of the present work was to gain a deeper understanding of the influence of the SNS on the phenotype of osteoblasts, a major cell type in bone. An in vitro co-culture model with human osteoblasts and sympathetic-like, neuroendocrine pheochromocytoma-12 (PC-12) encapsulated within separate 3D poly(ethylene glycol) diacrylate (PEGDA) hydrogels was utilized to assess markers involved with bone ECM formation and osteoclast formation...
November 18, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27862940/chitosan-nhac-plga-microsphere-vehicle-for-sustained-release-of-rhbmp-2-and-its-derived-synthetic-oligopeptide-for-bone-regeneration
#6
Yanhui Ji, Mingbo Wang, Weiqiang Liu, Changsheng Chen, Wei Cui, Tingfang Sun, Qingling Feng, Xiaodong Guo
Both of the osteogenic factor and the suitable delivery system in bone tissue engineering are essential for bone regeneration. In this study, we manufactured two kinds of composite vehicles for sustained release of rhBMP-2 and its derived synthetic oligopeptide (Peptide-24, abbreviated as P24) for osteogenesis and bone defect repair. The composite vehicle was based on cross-linked chitosan, nano-hydroxyapatite/collagen (nHAC), and poly (lactide-co-glycolide) acid microsphere. The physicochemical properties of the composite vehicles (abbreviated as CS/nHAC/PLGA-MS) were investigated...
November 10, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27885823/novel-functionalization-strategies-of-polymeric-nanoparticles-as-carriers-for-brain-medications
#7
Corinne Portioli, Michele Bovi, Donatella Benati, Marta Donini, Massimiliano Perduca, Alessandro Romeo, Stefano Dusi, Hugo L Monaco, Marina Bentivoglio
For targeted brain delivery, nanoparticles (NPs) should bypass the blood-brain barrier (BBB). Novel functionalization strategies, based on low-density lipoprotein receptor (LDLR) binding domain, have been here tested to increase the brain targeting efficacy of poly d,l-lactic-co-glycolic acid (PLGA) NPs, biodegradable and suited for biomedical applications. Custom-made PLGA NPs were functionalized with an apolipoprotein E modified peptide (pep-apoE) responsible for LDLR binding, or with lipocalin-type prostaglandin-d-synthase (L-PGDS), highly expressed in the brain...
November 5, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27885785/osteogenic-activity-and-antibacterial-effect-of-porous-titanium-modified-with-metal-organic-framework-films
#8
Junyu Chen, Xin Zhang, Chao Huang, He Cai, Shanshan Hu, Qianbing Wan, Xibo Pei, Jian Wang
As a new class of crystalline nanoporous materials, metal-organic frameworks (MOFs) have recently been used for biomedical applications due to their large surface area, high porosity, and theoretically infinite structures. To improve the biological performance of titanium, MOF films were applied to surface modification of titanium. Zn-based MOF films composed of zeolitic imidazolate framework-8 (ZIF-8) crystals with nanoscale and microscale sizes (nanoZIF-8 and microZIF-8) were prepared on porous titanium surfaces by hydrothermal and solvothermal methods, respectively...
November 5, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27813317/bone-forming-cells-with-pronounced-spread-into-the-third-dimension-in-polymer-scaffolds-fabricated-by-two-photon-polymerization
#9
J Heitz, C Plamadeala, M Wiesbauer, P Freudenthaler, R Wollhofen, J Jacak, T A Klar, B Magnus, D Köstner, A Weth, W Baumgartner, R Marksteiner
The main aim of this work was to stimulate bone-forming cells to produce three-dimensional networks of mineralized proteins such as those occurring in bones. This was achieved by a novel approach using a specific type of mesenchymal progenitor cells (i.e., primary fibroblast cells from human hair roots) seeded onto polymer scaffolds. We wrote polymer microstructures with one or more levels of quadratic pores onto a flexible substrate by means of two-photon polymerization using a Ti-sapphire femtosecond laser focused into a liquid acrylate-based resin containing a photoinitiator...
November 3, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27813288/the-pathology-of-the-foreign-body-reaction-against-biomaterials
#10
REVIEW
R Klopfleisch, F Jung
The healing process after implantation of biomaterials involves the interaction of many contributing factors. Besides their in vivo functionality, biomaterials also require characteristics that allow their integration into the designated tissue without eliciting an overshooting foreign body reaction. The targeted design of biomaterials with these features, thus, needs understanding of the molecular mechanisms of the foreign body reaction. Much effort has been put into research on the interaction of engineered materials and the host tissue...
November 3, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27806444/engineering-specific-chemical-modification-sites-into-a-collagen-like-protein-from-streptococcus-pyogenes
#11
Violet Stoichevska, Yong Y Peng, Aditya V Vashi, Jerome A Werkmeister, Geoff J Dumsday, John A M Ramshaw
Recombinant bacterial collagens provide a new opportunity for safe biomedical materials. They are readily expressed in E. coli in good yield and can be readily purified by simple approaches. However, recombinant proteins are limited in that direct secondary modification during expression is generally not easily achieved. Thus, inclusion of unusual amino acids, cyclic peptides, sugars, lipids and other complex functions generally needs to be achieved chemically after synthesis and extraction. In the present study we have illustrated that bacterial collagens that have had their sequences modified to include cysteine residue(s), which are not normally present in bacterial collagen-like sequences, enable a range of specific chemical modification reactions to be produced...
November 2, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27798959/injectable-uncrosslinked-biomimetic-hydrogels-as-candidate-scaffolds-for-neural-stem-cell-delivery
#12
Kurt Farrell, Jyotsna Joshi, Chandrasekhar R Kothapalli
Mammalian central nervous system has a limited ability for self-repair under diseased or injury conditions. Repair strategies focused on exogenously delivering autologous neural stem cells (NSCs) to replace lost neuronal populations and axonal pathways in situ, and promote endogenous repair mechanisms are gaining traction. Successful outcomes are contingent on selecting an appropriate delivery vehicle for injecting cells that promotes cell retention and survival, elicits differentiation to desired lineages, and enhances axonal outgrowth upon integration into the host tissue...
October 31, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27798956/neurite-extension-and-neuronal-differentiation-of-human-induced-pluripotent-stem-cell-derived-neural-stem-cells-on-a-polyethylene-glycol-hydrogels-containing-a-continuous-young-s-modulus-gradient
#13
Matthew C Mosley, Hyun Ju Lim, Jing Chen, Yueh-Hsun Yang, Shenglan Li, Ying Liu, Laura A Smith Callahan
Mechanotransduction in neural cells involves multiple signaling pathways that are not fully understood. Differences in lineage and maturation state are suggested causes for conflicting reports on neural cell mechanosensitivity. In order to optimize matrices for use in stem cell therapy treatments transplanting human induced pluripotent stem cell derived neural stem cells (hNSC) into lesions after spinal cord injury, the effects of Young's Modulus changes on hNSC behavior must be understood. The present study utilizes polyethylene glycol hydrogels containing a continuous gradient in Young's modulus to examine changes in the Young's Modulus of the culture substrate on hNSC neurite extension and neural differentiation...
October 31, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27784135/pdlla-scaffolds-with-cu-and-zn-doped-bioactive-glasses-having-multifunctional-properties-for-bone-regeneration
#14
Julian Bejarano, Rainer Detsch, Aldo R Boccaccini, Humberto Palza
Novel multifunctional scaffolds for bone regeneration can be developed by incorporation of bioactive glasses doped with therapeutic and antibacterial metal ions, such as copper (Cu) and zinc (Zn), into a biodegradable polymer. In this context, porous composite materials of biodegradable poly(D, L-lactide) (PDLLA) mixed with sol-gel bioactive glasses (BG) of chemical composition 60SiO2 ; 25CaO; 11Na2 O; and 4P2 O5 (mol.%) doped with either 1 mol% of CuO or ZnO, and with both metals, were prepared. The cytocompatibility of the scaffolds on bone marrow stromal cells (ST-2) depended on both, the amount of glass filler and the concentration of metal ion, as evaluated by lactate dehydrogenase (LDH) activity, cell viability (water-soluble tetrazolium salt (WST-8)), and by cell morphology (scanning electron microscopy (SEM)) tests...
October 26, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27784134/bacterial-and-mammalian-cells-adhesion-to-tantalum-decorated-micro-nano-structured-titanium
#15
Yu Zhu, Yingxin Gu, Shichong Qiao, Linyi Zhou, Junyu Shi, Hongchang Lai
Microorganisms are frequently introduced to dental implants during surgery and start the race for the surface with host cells before osseointegration occurs. The aim of the study was to endow implant surfaces with biological functions that reliably select cells over microbes. Nano-structured tantalum (Ta) has exhibited excellent compatibility. Thus, nano-structured Ta films were deposited on the sand-blasted, large grit, and acid-etched (SLA) titanium by the magnetron sputtering method, thus forming hierarchical micro-/nano-structured surfaces...
October 26, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27784129/multilayer-cellular-stacks-of-gelatin-hydroxyapatite-fiber-scaffolds-for-bone-tissue-engineering
#16
A A Salifu, C Lekakou, F Labeed
Multilayer cellular stacks of crosslinked, electrospun 25 wt% hydroxyapatite (HA)-gelatin and pure gelatin fiber scaffolds, seeded with human foetal osteoblasts (hFOBs), were studied for up to 18 days in static and dynamic cell culture. Two types of stack models were investigated: a four-layer stack with cells seeded at the bottom surface of the first/top layer and the top surface of the fourth/bottom layer, so that the two middle layers were not seeded with cells with the aim to act as continuing conduits of culture medium and nutrients supply to the adjacent cell-populated zones; a three-layer stack with cells seeded at the bottom surface of each layer...
October 26, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27779830/construction-and-histological-analysis-of-a-3d-human-arterial-wall-model-containing-vasa-vasorum-using-a-layer-by-layer-technique
#17
Fumiaki Shima, Hirokazu Narita, Ayami Hiura, Hiroshi Shimoda, Mitsuru Akashi
There is considerable global demand for three-dimensional (3D) functional tissues which mimic our native organs and tissues for use as in vitro drug screening systems and in regenerative medicine. In particular, there has been an increasing number of patients who suffer from arterial diseases such as arteriosclerosis. As such, in vitro 3D arterial wall models that can evaluate the effects of novel medicines and a novel artificial graft for the treatment are required. In our previous study, we reported the rapid construction of 3D tissues by employing a Layer-by-Layer (LbL) technique and revealed their potential applications in the pharmaceutical fields and tissue engineering...
October 25, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27774773/experimental-and-computational-examination-of-anastellin-fniii1c-polymer-interactions
#18
David Mallinson, David L Cheung, Dorin Simionesie, Alexander B Mullen, Zhenyu J Zhang, Dimitrios A Lamprou
Using a combination of experimental and computational approaches, the interaction between anastellin, a recombinant fragment of fibronectin, and representative biomaterial surfaces has been examined. Anastellin and superfibronectin, have been seen to exhibit anti-angiogenic properties and other properties that may make it suitable for consideration for incorporation into biomaterials. The molecular interaction was directly quantified by atomic force microscope (AFM) based force spectroscopy, complemented by adsorption measurements using quartz crystal microbalance (QCM)...
October 24, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27770566/differential-magnesium-implant-corrosion-coat-formation-and-contribution-to-bone-bonding
#19
Muhammad Imran Rahim, Andreas Weizbauer, Florian Evertz, Andrea Hoffmann, Manfred Rohde, Birgit Glasmacher, Henning Windhagen, Gerhard Gross, Jan-Marten Seitz, Peter P Mueller
Magnesium alloys are presently under investigation as promising biodegradable implant materials with osteoconductive properties. To study the molecular mechanisms involved, the potential contribution of soluble magnesium corrosion products to the stimulation of osteoblastic cell differentiation was examined. However, no evidence for the stimulation of osteoblast differentiation could be obtained when cultured mesenchymal precursor cells were differentiated in the presence of metallic magnesium or in cell culture medium containing elevated magnesium ion levels...
October 22, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/27770565/the-effect-of-particle-size-on-the-genotoxicity-of-gold-nanoparticles
#20
Qiyue Xia, Hongxia Li, Ying Liu, Kai Xiao
Despite the increasing biomedical applications of gold nanoparticles (AuNPs), their toxicological effects need to be thoroughly understood. In the present study, the genotoxic potential of commercially available AuNPs with varying size (5 nm, 20 nm and 50 nm) were assessed using a battery of in vitro and in vivo genotoxicity assays. In the comet assay, 20 nm and 50 nm AuNPs did not induce obvious DNA damage in HepG2 cells at the tested concentrations, whereas 5 nm NPs induced a dose-dependent increment in DNA damage after 24 h exposure...
October 22, 2016: Journal of Biomedical Materials Research. Part A
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