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https://www.readbyqxmd.com/read/28922634/functionalisation-of-ti6al4v-and-hydroxyapatite-surfaces-with-combined-peptides-based-on-kklpda-and-eeeeeeee-peptides
#1
Gabriela Melo Rodriguez, James Bowen, David Grossin, Besim Ben-Nissan, Artemis Stamboulis
Surface modifications are usually performed on titanium alloys to improve osteo-integration and surface bioactivity. Modifications such as alkaline and acid etching, or coating with bioactive materials such as hydroxyapatite, have previously been demonstrated. The aim of this work is to develop a peptide with combined titanium oxide and hydroxyapatite binders in order to achieve a biomimetic hydroxyapatite coating on titanium surfaces. The technology would also be applicable for the functionalisation of titanium and hydroxyapatite surfaces for selective protein adsorption, conjugation of antimicrobial peptides, and adsorption of specialised drugs for drug delivery...
September 9, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28921946/biomimetic-magnetosomes-as-versatile-artificial-antigen-presenting-cells-to-potentiate-t-cell-based-anticancer-therapy
#2
Qianmei Zhang, Wei Wei, Peiling Wang, Liping Zuo, Feng Li, Jin Xu, Xiaobo Xi, Xiaoyong Gao, Guanghui Ma, Hai-Yan Xie
Adoptive T-cell transfer for cancer therapy relies on both effective ex vivo T cell expansion and in vivo targeting performance. One promising but challenging method for accomplishing this purpose is to construct multifunctional artificial antigen-presenting cells (aAPCs). We herein developed biomimetic magnetosomes as versatile aAPCs, wherein magnetic nanoclusters were coated with azide-engineered leucocyte membranes and then decorated with T-cell stimuli through copper-free click chemistry. These novel nano aAPCs not only exhibited high performance for antigen-specific cytotoxic T cell (CTL) expansion and stimulation but also visually and effectively guided reinfused CTLs to tumor tissues through magnetic resonance imaging and magnetic control...
September 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28921943/self-assembly-of-mesoscale-artificial-clathrin-mimics
#3
Yifan Kong, Mina-Elraheb S Hanna, Denys Zhuo, Katherine G Chang, Tara Bozorg-Grayeli, Nicholas A Melosh
Fluidic control and sampling in complex environments is an important process in biotechnology, materials synthesis, and microfluidics. An elegant solution to this problem has evolved in nature through cellular endocytosis, where the dynamic recruitment, self-assembly, and spherical budding of clathrin proteins allows cells to sample their external environment. Yet despite the importance and utility of endocytosis, artificial systems which can replicate this dynamic behavior have not been developed. Guided by clathrin's unusual structure, we created simplified metallic microparticles that capture the three-legged shape, particle curvature, and interfacial attachment characteristics of clathrin...
September 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28920612/visible-light-mediated-oxidative-demethylation-of-n-6-methyl-adenines
#4
Li-Jun Xie, Rui-Li Wang, Dong Wang, Li Liu, Liang Cheng
We report a simple protocol that affords oxidative demethylation of N(6)-methyl groups in N(6)-methyl adenines (m(6)A). The biologically compatible photocatalyst riboflavin prompts a highly selective C-H abstraction from N(6)-methyl in adenines under the irradiation of a visible blue LED light, affording a novel and highly selective biomimetic demethylation of m(6)A and related N-methyl adenine analogues.
September 18, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28920442/novelty-of-dynamic-process-in-the-synthesis-of-biocompatible-silica-nanotubes-by-biomimetic-glycyldodecylamide-as-a-soft-template
#5
Hyejung Choi, Joong-Jo Kim, Yong-Hwan Mo, Benjaram Mahipal Reddy
Dynamic process in the synthesis of silica nanotubes (SNTs) by utilizing glycyldodecylamide (GDA) as a soft template was thoroughly investigated. The morphological evolution from GDA to SNTs was deeply explored to elucidate the formation mechanism for optimizing the synthesis procedure. Various analytical tools, namely, XRD, FTIR, SEM, TEM, Z-potential, and N2 adsorption/desorption isotherms were employed during the synthesis procedure. The interactive structure of GDA was also investigated using TEM-EDX as a function of aging time...
September 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28919736/carbon-nanotubes-gathered-onto-silica-particles-lose-their-biomimetic-properties-with-the-cytoskeleton-becoming-biocompatible
#6
Elena González-Domínguez, Nerea Iturrioz-Rodríguez, Esperanza Padín-González, Juan Villegas, Lorena García-Hevia, Moisés Pérez-Lorenzo, Wolfgang J Parak, Miguel A Correa-Duarte, Mónica L Fanarraga
Carbon nanotubes (CNTs) are likely to transform the therapeutic and diagnostic fields in biomedicine during the coming years. However, the fragmented vision of their side effects and toxicity in humans has proscribed their use as nanomedicines. Most studies agree that biocompatibility depends on the state of aggregation/dispersion of CNTs under physiological conditions, but conclusions are confusing so far. This study designs an experimental setup to investigate the cytotoxic effect of individualized multiwalled CNTs compared to that of identical nanotubes assembled on submicrometric structures...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28915048/xfel-radiation-damage-through-the-s-state-cycle-of-the-oxygen-evolving-complex-of-photosystem-ii
#7
Muhamed Amin, Mikhail Askerka, Victor S Batista, Gary W Brudvig, Marilyn R Gunner
The oxygen-evolving complex (OEC) of photosystem II (PSII) catalyzes water-splitting through a reaction mechanism that cycles the OEC through five redox states, the 'S-state' intermediates. Understanding structure/function relations of the S-state intermediates is crucial for elucidation of the reaction mechanism and the design of biomimetic catalytic systems. Due to the limitations of conventional X-ray crystallography, serial femtosecond X-ray crystallography has been used to minimize the radiation-damage...
September 15, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28914740/the-role-of-precisely-matching-fascicles-in-the-quick-recovery-of-nerve-function-in-long-peripheral-nerve-defects
#8
Liwei Yan, Zhi Yao, Tao Lin, Qingtang Zhu, Jian Qi, Liqiang Gu, Jintao Fang, Xiang Zhou, Xiaolin Liu
Peripheral nerve injury therapy in the clinic remains less than satisfactory. The gold standard of treatment for long peripheral nerve defects is autologous nerve grafts; however, numerous clinical complications are associated with this treatment. As tissue engineering has developed, tissue-engineered nerve grafts (TENGs) have shown potential applications as alternatives to autologous nerve grafts. To verify the important role of the biomimetic pathway of fascicle design in TENGs, we designed an animal model to study the role of the precise matching of fascicles in the effectiveness of nerve function recovery...
October 18, 2017: Neuroreport
https://www.readbyqxmd.com/read/28913600/a-multilayer-biomaterial-for-osteochondral-regeneration-shows-superiority-vs-microfractures-for-the-treatment-of-osteochondral-lesions-in-a-multicentre-randomized-trial-at-2-years
#9
Elizaveta Kon, Giuseppe Filardo, Mats Brittberg, Maurizio Busacca, Vincenzo Condello, Lars Engebretsen, Stefan Marlovits, Philipp Niemeyer, Patrik Platzer, Michael Posthumus, Peter Verdonk, Renè Verdonk, Jan Victor, Willem van der Merwe, Wojciech Widuchowski, Claudio Zorzi, Maurilio Marcacci
PURPOSE: The increasing awareness on the role of subchondral bone in the etiopathology of articular surface lesions led to the development of osteochondral scaffolds. While safety and promising results have been suggested, there are no trials proving the real potential of the osteochondral regenerative approach. Aim was to assess the benefit provided by a nanostructured collagen-hydroxyapatite (coll-HA) multilayer scaffold for the treatment of chondral and osteochondral knee lesions. METHODS: In this multicentre randomized controlled clinical trial, 100 patients affected by symptomatic chondral and osteochondral lesions were treated and evaluated for up to 2 years (51 study group and 49 control group)...
September 14, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28912891/bioengineering-of-artificial-antigen-presenting-cells-and-lymphoid-organs
#10
REVIEW
Chao Wang, Wujin Sun, Yanqi Ye, Hunter N Bomba, Zhen Gu
The immune system protects the body against a wide range of infectious diseases and cancer by leveraging the efficiency of immune cells and lymphoid organs. Over the past decade, immune cell/organ therapies based on the manipulation, infusion, and implantation of autologous or allogeneic immune cells/organs into patients have been widely tested and have made great progress in clinical applications. Despite these advances, therapy with natural immune cells or lymphoid organs is relatively expensive and time-consuming...
2017: Theranostics
https://www.readbyqxmd.com/read/28912594/quantification-of-aquaporin-z-reconstituted-into-vesicles-for-biomimetic-membrane-fabrication
#11
Hui Xian Gan, Hu Zhou, Qingsong Lin, Yen Wah Tong
Aquaporin incorporated biomimetic membranes are anticipated to offer unprecedented desalination capabilities. However, the lack of accurate methods to quantify the reconstituted aquaporin presents a huge hurdle in investigating aquaporin performance and optimizing membrane fabrication. Herein, we present three quantification methods to determine the Aquaporin-Z reconstituted into E. coli lipid vesicles: 1) nanogold labeling with transmission electron microscopy (TEM) visualization, 2) nickel labeling with inductively coupled plasma-mass spectrometry (ICP-MS) and 3) gel electrophoresis...
September 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28912505/biomimetic-silica-nanoparticles-prepared-by-a-combination-of-solid-phase-imprinting-and-ostwald-ripening
#12
Elena Piletska, Heersh Yawer, Francesco Canfarotta, Ewa Moczko, Katarzyna Smolinska-Kempisty, Stanislav S Piletsky, Antonio Guerreiro, Michael J Whitcombe, Sergey A Piletsky
Herein we describe the preparation of molecularly imprinted silica nanoparticles by Ostwald ripening in the presence of molecular templates immobilised on glass beads (the solid-phase). To achieve this, a seed material (12 nm diameter silica nanoparticles) was incubated in phosphate buffer in the presence of the solid-phase. Phosphate ions act as a catalyst in the ripening process which is driven by differences in surface energy between particles of different size, leading to the preferential growth of larger particles...
September 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28910516/controlling-differentiation-of-stem-cells-for-developing-personalized-organ-on-chip-platforms
#13
REVIEW
Armin Geraili, Parya Jafari, Mohsen Sheikh Hassani, Behnaz Heidary Araghi, Mohammad Hossein Mohammadi, Amir Mohammad Ghafari, Sara Hasanpour Tamrin, Hassan Pezeshgi Modarres, Ahmad Rezaei Kolahchi, Samad Ahadian, Amir Sanati-Nezhad
Organ-on-chip (OOC) platforms have attracted attentions of pharmaceutical companies as powerful tools for screening of existing drugs and development of new drug candidates. OOCs have primarily used human cell lines or primary cells to develop biomimetic tissue models. However, the ability of human stem cells in unlimited self-renewal and differentiation into multiple lineages has made them attractive for OOCs. The microfluidic technology has enabled precise control of stem cell differentiation using soluble factors, biophysical cues, and electromagnetic signals...
September 14, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28910078/bifacial-biomimetic-freestanding-anisotropic-catechol-interfaces-with-asymmetrically-layered-films-as-versatile-extracellular-matrix-substitutes
#14
Byung Gee Im, Minjae Do, Yoojin Kim, Mira Cho, Jae-Hyung Jang
Biological naïve extracellular matrices (ECMs) exhibit anisotropic functions in their physical, chemical, and morphological properties. Representative examples include anisotropic skin layers or blood vessels simultaneously facing multiphasic environments. Here, anisotropically multifunctional structures called BiFACIAL (biomimetic freestanding anisotropic catechol-interfaces with asymmetrically layered) films were developed simply by contacting two polysaccharide solutions of heparin-catechol (Hep-C) and chitosan-catechol (Chi-C)...
September 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28905623/electropumping-of-water-through-human-aquaporin-4-by-circularly-polarized-electric-fields-dramatic-enhancement-and-control-revealed-by-non-equilibrium-molecular-dynamics
#15
Christian J Burnham, Niall J English
An extensive suite of nonequilibrium molecular-dynamics (NEMD) simulations have been performed for ∼60 ns of human aquaporin 4 in externally applied circularly polarized (CP) electric fields, applied axially along channels. These external fields were 0.05 V/Å in intensity and 100 GHz in frequency. This has the effect of "electro-pumping" the water through the pores as prototypical biochannels, from conversion of molecules' spin angular momentum to linear momentum in the asymmetric heterogeneous-frictional environment of the pores, thus inducing overall net flow...
September 14, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28902637/development-of-fish-collagen-bioactive-glass-chitosan-composite-nanofibers-as-a-gtr-gbr-membrane-for-inducing-periodontal-tissue-regeneration
#16
Tian Zhou, Xin Liu, Baiyan Sui, Chao Liu, Xiumei Mo, Jiao Sun
The development of a guided tissue or bone regeneration (GTR/GBR) membrane with excellent performance has been a major challenge in the biomedical field. The present study was designed to prepare a biomimetic electrospun fish collagen/bioactive glass/chitosan (Col/BG/CS) composite nanofiber membrane and determine its structure, mechanical property, antibacterial activity, and biological effects on human periodontal ligament cells (HPDLCs). The effects of this composite membrane on inducing periodontal tissue regeneration were evaluated using a dog class II furcation defect model...
September 13, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28901994/biomineralized-conductive-pedot-pss-coated-pla-phbv-ha-nanofibrous-membranes
#17
Mohd Izzat Hassan, Noor Nabilah Masnawi, Naznin Sultana
Conductive materials are potential candidates for developing bone tissue engineering scaffolds as they are nontoxic and can enhance bone tissue regeneration. Their bioactivity can be enhanced by depositing biomineralization in simulated body fluid (SBF). In the current study, a composite electrospun membrane made up of poly(lactic) acid, poly(3-hydroxybutyrate-co-3-hydroxyvalerate), and hydroxyapatite was fabricated using an electrospinning method. The fabricated membranes were dip-coated with a conductive polymer solution, poly(3,4-ethylenedioxythiophene) poly(4-styrenesulfonate), to induce conductivity...
September 7, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28901712/engineering-concepts-in-stem-cell-research
#18
REVIEW
Karthikeyan Narayanan, Sachin Mishra, Satnam Singh, Ming Pei, Balazs Gulyas, Parasuraman Padmanabhan
The field of regenerative medicine integrates advancements made in stem cells, molecular biology, engineering and clinical methodologies. Stem cells serve as a fundamental ingredient for therapeutic application in regenerative medicine. Apart from stem cells, engineering concepts have equally contributed to the success of stem cell based applications in improving human health. The purpose of various engineering methodologies is to develop regenerative and preventive medicine to combat various diseases and deformities...
September 13, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28898526/spin-state-controlled-photodissociation-of-iron-iii-azide-to-iron-v-nitride-complex
#19
Erik Andris, Rafael Navratil, Juraj Jasik, Gerard Sabenya, Miquel Costas, Martin Srnec, Jana Roithová
We report the generation of iron(V) nitride complexes, which are targets of biomimetic chemistry. Temperature-dependent ion spectroscopy shows that this reaction is governed by the spin state population of their iron(III) azide precursors and can be tuned by temperature. The complex [(MePy2TACN)Fe(N3)]2+ exists as a mixture of sextet and doublet spin states at 300 K, whereas only the doublet state is populated at 3 K. Photofragmentation of the sextet state complex leads to the reduction of the iron centre. The doublet state complex photodissociates to the desired iron(V) nitride complex...
September 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28898103/a-comparative-study-of-secondary-structure-and-interactions-of-the-r5-peptide-in-silicon-oxide-and-titanium-oxide-co-precipitates-using-solid-state-nmr-spectroscopy
#20
Erika L Buckle, Adrienne Roehrich, Branden Vandermoon, Gary P Drobny
A biomimetic, peptide-mediated approach to inorganic nanostructure formation is of great interest as an alternative to industrial production methods. To investigate the role of peptide structure on silica (SiO2) and titania (TiO2) morphologies, we use the R5 peptide domain derived from the silaffin protein to produce uniform SiO2 and TiO2 nanostructures from the precursor silicic acid and titanium bis(ammonium lactato)dihydroxide, respectively. The resulting biosilica and biotitania nanostructures are characterized using scanning electron microscopy...
September 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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