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Journal of Biomaterials Applications

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https://www.readbyqxmd.com/read/27932703/an-in%C3%A2-vivo-pilot-study-of-a-microporous-thin-film-nitinol-covered-stent-to-assess-the-effect-of-porosity-and-pore-geometry-on-device-interaction-with-the-vessel-wall
#1
Youngjae Chun, Colin P Kealey, Daniel S Levi, David A Rigberg, Yanfei Chen, Bryan W Tillman, K P Mohanchandra, Mahdis Shayan, Gregory P Carman
Sputter-deposited thin film nitinol constructs with various micropatterns were fabricated to evaluate their effect on the vessel wall in vivo when used as a covering for commercially available stents. Thin film nitinol constructs were used to cover stents and deployed in non-diseased swine arteries. Swine were sacrificed after approximately four weeks and the thin film nitinol-covered stents were removed for histopathologic evaluation. Histopathology revealed differences in neointimal thickness that correlated with the thin film nitinol micropattern...
December 8, 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27932702/incorporation-of-cerium-oxide-into-hydroxyapatite-coating-regulates-osteogenic-activity-of-mesenchymal-stem-cell-and-macrophage-polarization
#2
Kai Li, Qingyi Shen, Youtao Xie, Mingyu You, Liping Huang, Xuebin Zheng
Biomedical coatings for orthopedic implants should facilitate osseointegration and mitigate implant-induced inflammatory reactions. Cerium oxide (CeO2) ceramics possess anti-oxidative properties and can be used to decrease mediators of inflammation, which makes them attractive for biomedical applications. In our work, two kinds of CeO2 incorporated hydroxyapatite coatings (HA-10Ce and HA-30Ce) were prepared via plasma spraying technique and the effects of CeO2 addition on the responses of bone mesenchymal stem cells (BMSCs) and RAW264...
December 8, 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27932701/synthesis-and-characterization-of-fluorescein-grafted-polyurethane-for-potential-application-in-biomedical-tracing
#3
Boyuan Yang, Qin Zou, Lili Lin, Limei Li, Yi Zuo, Yubao Li
Redesigned multifunctional biopolymers represent a novel building bridge for interdisciplinary collaborations in biomaterials development. We prepared fluorescein-grafted polyurethane scaffolds (PU-C1, PU-C5, and PU-B1) to meet both clinical needs and biological safety evaluations, using different contents of calcein and different synthesis procedures for potential biomedical tracing. X-ray diffraction, infrared, X-ray photoelectron spectroscopy, nuclear magnetic resonance, scanning electron microscopy, and light microscopy were used to analyze the composition and structure of polyurethanes, as well as to observe their morphology with and without biomarkers...
December 8, 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27913653/dimensional-evaluation-of-patient-specific-3d-printing-using-calcium-phosphate-cement-for-craniofacial-bone-reconstruction
#4
Liciane Sabadin Bertol, Rodrigo Schabbach, Luís Alberto Loureiro Dos Santos
The 3D printing process is highlighted nowadays as a possibility to generate individual parts with complex geometries. Moreover, the development of 3D printing hardware, software and parameters permits the manufacture of parts that can be not only used as prototypes, but are also made from materials that are suitable for implantation. In this way, this study investigates the process involved in the production of patient-specific craniofacial implants using calcium phosphate cement, and its dimensional accuracy...
December 1, 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27888253/thermo-sensitive-hydrogel-plga-peg-plga-as-a-vaccine-delivery-system-for-intramuscular-immunization
#5
Xiaoyan Wang, Yu Zhang, Wei Xue, Hong Wang, Xiaozhong Qiu, Zonghua Liu
In this work, we explored the potential of thermo-sensitive PLGA-PEG-PLGA with sol-gel transition temperature around 32℃ as an intramuscular vaccine delivery system by using ovalbumin as a model antigen. First, in vitro release test showed that the PLGA-PEG-PLGA-deriving hydrogels could release ovalbumin in vitro in a more sustainable way. From fluorescence living imaging, 50-200 mg/mL of PLGA-PEG-PLGA formulations could release antigen in a sustainable manner in vivo, suggesting that the PLGA-PEG-PLGA hydrogel worked as an antigen-depot...
November 25, 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27881642/clinoptilolite-pcl-peg-pcl-composite-scaffolds-for-bone-tissue-engineering-applications
#6
Engin Pazarçeviren, Özge Erdemli, Dilek Keskin, Ayşen Tezcaner
The aim of this study was to prepare and characterize highly porous clinoptilolite/poly(ε-caprolactone)-poly(ethylene glycol)-poly(ε-caprolactone) composite scaffolds. Scaffolds with different clinoptilolite contents (10% and 20%) were fabricated with reproducible solvent-free powder compression/particulate leaching technique. The scaffolds had interconnective porosity in the range of 55-76%. Clinoptilolite/poly(ε-caprolactone)-poly(ethylene glycol)-poly(ε-caprolactone) scaffolds showed negligible degradation within eight weeks and displayed less water uptake and higher bioactivity than poly(ε-caprolactone)-poly(ethylene glycol)-poly(ε-caprolactone) scaffolds...
November 23, 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27881641/folic-acid-conjugated-soybean-protein-based-nanoparticles-mediate-efficient-antitumor-ability-in%C3%A2-vitro
#7
Weijing Yao, Qian Zha, Xu Cheng, Xin Wang, Jun Wang, Rupei Tang
In this study, soy protein isolate was hydrolyzed by compound enzymes to give aqueous soy protein with low molecular weights. Folic acid modified and free soy protein nanoparticles were successfully prepared by a desolvation method as target-specific drug delivery, respectively. Ultraviolet spectrophotometry demonstrated that folic acid was successfully grafted onto soy protein. The shape and size of folic acid modified soy protein nanoparticles were detected by transmission electron microscopy, scanning electron microscope, and dynamic light scattering...
November 23, 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27881640/polymer-based-material-containing-calcium-phosphate-particles-functionalized-with-a-dimethacrylate-monomer-for-use-in-restorative-dentistry
#8
Marcela C Rodrigues, Tathy A Xavier, Victor E Arana-Chavez, Roberto R Braga
Dicalcium phosphate dihydrate particles functionalized with triethyleneglycol dimethacrylate were synthesized and added to a photocurable mixture of bisphenol-A glycidyl dimethacrylate and triethyleneglycol dimethacrylate with the purpose of developing a resin composite capable of releasing calcium and phosphate ions to foster dental remineralization. Particle functionalization would minimize the deleterious effect of adding low cohesive strength nano-structured particles with no chemical interaction with the organic matrix on the material's mechanical properties...
November 23, 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27881639/enhancement-of-osseointegration-by-direct-coating-of-rhbmp-2-on-target-ion-induced-plasma-sputtering-treated-sla-surface-for-dental-application
#9
Sungwon Kim, Cheonil Park, Byeong-Seok Moon, Hyoun-Ee Kim, Tae-Sik Jang
Owing to the excellent bioactive properties of recombinant human bone morphogenetic proteins (rhBMPs), dentistry considers them as a fascinating adjuvant alternative for enhancing bone regeneration and bone-to-implant junction in the early implantation stages. However, stable loading and delivery efficiency of rhBMPs on the implant surfaces involve major concerns because of the harsh wearing condition under load during implantation. In this study, to achieve successful rhBMP-2 delivery, a nanoporous surface structure is introduced on the sandblasting with large grit and acid-etching (SLA)-treated titanium (Ti) surface via the tantalum (Ta) target-ion induced plasma sputtering (TIPS) technique...
November 23, 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27742865/oral-delivery-of-human-growth-hormone-preparation-characterization-and-pharmacokinetics
#10
Yanan Shi, Keke Li, Baocheng Tian, Maolei Xu, Qingzhi Lv, Juanjuan Zhao, Jingtian Han, Dongxiao Feng
Daily subcutaneous injection of human growth hormone has been used for the treatment of growth hormone deficiency and growth failure but has led to poor patient compliance and renal toxicity. Thus, it is crucial to develop favorable growth hormone delivery systems to improve patient compliance. In the present study, to increase the oral bioavailability of growth hormone and improve patient compliance, enteric-coated capsules filled with monomethoxyl poly(ethylene glycol)-b-poly(L-lactide-co-glycolide) nanoparticles were prepared to facilitate oral growth hormone delivery...
October 14, 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27698255/fabrication-and-characterization-of-metal-stent-coating-with-drug-loaded-nanofiber-film-for-gallstone-dissolution
#11
Qiang Gao, Chao Huang, Binbin Sun, Bhutto M Aqeel, Jing Wang, Weiming Chen, Xiumei Mo, Xinjian Wan
Stent insertion and chemical agents of ethylene diamine tetraacetic acid and sodium cholate for dissolving common bile duct stone diseases through extra biliary tract infusion have been believed a relatively effective therapeutics for the clinical symptom. Core-shell nanofibers produced by co-axial electrospinning to deliver chemical drugs, biomacromolecules, genes and even cells have been reported for various advanced drug delivery system and tissue engineering applications. In the present study, poly (lactide-co-ɛ-caprolactone) (PLCL) core-shell nanofiber-coated film of stent, loaded with ethylene diamine tetraacetic acid and sodium cholate in core layer, was fabricated by co-axial electrospinning for treating gallstone disease...
October 3, 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27671104/antibacterial-and-osteo-stimulatory-effects-of-a-borate-based-glass-series-doped-with-strontium-ions
#12
Yiming Li, Wendy Stone, Emil H Schemitsch, Paul Zalzal, Marcello Papini, Stephen D Waldman, Mark R Towler
This work considered the effect of both increasing additions of Strontium (Sr(2+)) and incubation time on solubility and both antibacterial and osteo-stimulatory effects of a series of glasses based on the B2O3-P2O5-CaCO3-Na2CO3-TiO2-SrCO3 series. The amorphous nature of all the glasses was confirmed by X-ray diffraction. Discs of each glass were immersed in de-ionized water for 1, 7 and 30 days, and the water extracts were used for ion release profiles, pH measurements and cytotoxicity testing. Atomic absorption spectroscopy was employed to detect the release of Na(+), Ca(2+) and Sr(2+) ions from the glasses with respect to maturation, which indicated that the addition of Sr(2+) retarded solubility of the glass series...
September 26, 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27664187/tamoxifen-citrate-loaded-poly-d-l-lactic-acid-nanoparticles-evaluation-for-their-anticancer-activity-in-vitro-and-in-vivo
#13
N R Ravikumara, Mausumi Bharadwaj, Basavaraj Madhusudhan
The optimization of tamoxifen citrate entrapment and its release from biodegradable poly(d,l) lactic acid nanoparticles are prepared by modified spontaneous emulsification solvent diffusion method. Since the addition of tamoxifen citrate induces the formation of drug crystals from nanoparticle suspension the influence of several parameters on tamoxifen citrate encapsulation was investigated. In vitro studies for cytotoxicity, DNA ladder, and the expression of Bcl-2-Bax expression were also investigated for MCF-7 and MDA-MB-231 cells after the addition of tamoxifen citrate alone and tamoxifen citrate-poly(d,l) lactic acid-nanoparticles (encapsulated tamoxifen citrate)...
September 22, 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27638156/production-and-characterization-of-hyaluronic-acid-microparticles-for-the-controlled-delivery-of-growth-factors-using-a-spray-dehydration-method
#14
Pedro S Babo, Rui L Reis, Manuela E Gomes
Hyaluronic acid is the main polysaccharide present in the connective tissue. Besides its structural function as backbone of the extracellular matrix, hyaluronic acid plays staple roles in several biological processes including the modulation of inflammation and wound healing processes. The application of hyaluronic acid in regenerative medicine, either as cells and/or drug/growth factors delivery vehicles, relies on its ability to be cross-linked using a plethora of reactions, producing stable hydrogels. In this work, we propose a novel method for the production of hyaluronic acid microparticles that presents several advantages over others that have been used...
September 16, 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27638154/assessment-of-bone-healing-ability-of-calcium-phosphate-cements-loaded-with-platelet-lysate-in-rat-calvarial-defects
#15
Pedro S Babo, Pedro P Carvalho, Vítor E Santo, Susana Faria, Manuela E Gomes, Rui L Reis
Injectable calcium phosphate cements have been used as a valid alternative to autologous bone grafts for bone augmentation with the additional advantage of enabling minimally invasive implantation procedures and for perfectly fitting the tissue defect. Nevertheless, they have low biodegradability and lack adequate biochemical signaling to promote bone healing and remodeling. In previous in vitro studies, we observed that the incorporation of platelet lysate directly into the cement paste or loaded in hyaluronic acid microspheres allowed to modulate the cement degradation and the in vitro expression of osteogenic markers in seeded human adipose derived stem cells...
September 16, 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27789794/exploring-the-unexpected-influence-of-the-si-ge-ratio-on-the-molecular-architecture-and-mechanical-properties-of-al-free-gics
#16
Brett Dickey, Richard Price, Daniel Boyd
Germanium (Ge)-based glass ionomer cements have demonstrated the ability to balance strength with extended setting times, a unique set of characteristics for aluminum-free glass ionomer cements. However, the mechanical properties of current Ge-based glass ionomer cements significantly deteriorate over time, which jeopardizes their clinical potential. This work explores the effect of incrementally decreasing the Si:Ge ratio in the glass phase of zinc-silicate glass ionomer cements to identify potential mechanisms responsible for the time-induced mechanical instability of Ge-based glass ionomer cements...
November 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27789793/effect-of-the-incorporation-of-chitosan-on-the-physico-chemical-mechanical-properties-and-biological-activity-on-a-mixture-of-polycaprolactone-and-polyurethanes-obtained-from-castor-oil
#17
Fabian Arévalo, Yomaira L Uscategui, Luis Diaz, Martha Cobo, Manuel F Valero
In the present study, polyurethane materials were obtained from castor oil, polycaprolactone and isophorone diisocyanate by incorporating different concentrations of chitosan (0.5, 1.0 and 2.0% w/w) as an additive to improve the mechanical properties and the biological activity of polyurethanes. The polyurethanes were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, stress/strain fracture tests and swelling analysis, and the hydrophilic character of the surface was determined by contact angle trials...
November 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27638155/bio-printing-cell-laden-matrigel-agarose-constructs
#18
Rong Fan, Marine Piou, Evan Darling, Denis Cormier, Jun Sun, Jiandi Wan
3D printing of biological architectures that mimic the structural and functional features of in vivo tissues is of great interest in tissue engineering and the development of transplantable organ constructs. Printable bio-inks that are compatible with cellular activities play critical roles in the process of 3D bio-printing. Although a variety of hydrogels have been used as bio-inks for 3D bio-printing, they inherit poor mechanical properties and/or the lack of essential protein components that compromise their performance...
November 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27604088/augmenting-in%C3%A2-vitro-osteogenesis-of-a-glycine-arginine-glycine-aspartic-conjugated-oxidized-alginate-gelatin-biphasic-calcium-phosphate-hydrogel-composite-and-in%C3%A2-vivo-bone-biogenesis-through-stem-cell-delivery
#19
Nguyen Tb Linh, Kallyanashis Paul, Boram Kim, Byong-Taek Lee
A functionally modified peptide-conjugated hydrogel system was fabricated with oxidized alginate/gelatin loaded with biphasic calcium phosphate to improve its biocompatibility and functionality. Sodium alginate was treated by controlled oxidation to transform the cis-diol group into an aldehyde group in a controlled manner, which was then conjugated to the amine terminus of glycine-arginine-glycine-aspartic. Oxidized alginate glycine-arginine-glycine-aspartic was then combined with gelatin-loaded biphasic calcium phosphate to form a hydrogel of composite oxidized alginate/gelatin/biphasic calcium phosphate that displayed enhanced human adipose stem cell adhesion, spreading and differentiation...
September 6, 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27585972/three-dimensional-printing-akermanite-porous-scaffolds-for-load-bearing-bone-defect-repair-an-investigation-of-osteogenic-capability-and-mechanical-evolution
#20
An Liu, Miao Sun, Xianyan Yang, Chiyuan Ma, Yanming Liu, Xu Yang, Shigui Yan, Zhongru Gou
Some Ca-Mg-silicate ceramics have been widely investigated to be highly bioactive and biodegradable, whereas their osteogenic potential and especially biomechanical response in the early stage in vivo are scarcely demonstrated. Herein, the osteogenesis capacity and mechanical evolution of the akermanite (Ca2MgSi2O7) porous materials manufactured by ceramic ink writing three-dimensional printing technique were investigated systematically in a critical size femur defect model, in comparison with the clinically available β-tricalcium phosphate porous bioceramic...
September 1, 2016: Journal of Biomaterials Applications
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