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https://www.readbyqxmd.com/read/28532092/cytocompatibility-studies-of-titania-doped-calcium-borosilicate-bioactive-glasses-in-vitro
#1
Rajkumar Samudrala, Abdul Azeem P, Vasudevarao Penugurti, Bramanandam Manavathi
The present study aims to elucidate the applications of Titania (TiO2) doped calcium borosilicate glass as a biocompatible material in regenerative orthopedic applications. In this context, we have examined the bioactivity of various concentrations of TiO2 doped glasses with the help of simulated body fluid (SBF). Cytocompatibility, cell proliferation, and protein expression studies revealed the potential candidature of TiO2 doped glasses on osteoblast cell lines (MG-63). We hypothesized that TiO2 doped calcium borosilicate glasses are most cytocompatible material for bone implants...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532085/mesoporous-nano-bioglass-designed-for-the-release-of-imatinib-and-in-vitro-inhibitory-effects-on-cancer-cells
#2
Muhammad Shoaib, Aamer Saeed, Muhammad Saif Ur Rahman, Muhammad Moazzam Naseer
For treating bone cancer, controlled drug delivery is an important strategy. Bioactive scaffolds are widely used biomaterials due to their usefulness in localized drug delivery. The aim of this study was to develop mesoporous bioglass (MBG) with improved bioactivity and controllable drug delivery rate. By using pluronic 123 (P123) as a template, a facile sol-gel route was employed for the synthesis of MBG nanoparticles (NPs). The composition of the prepared sample was estimated by using energy dispersive X-ray spectroscopy (EDX)...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531864/determination-of-volumetric-gas-liquid-mass-transfer-coefficient-of-carbon-monoxide-in-a-batch-cultivation-system-using-kinetic-simulations
#3
Nulee Jang, Muhammad Yasin, Shinyoung Park, Robert W Lovitt, In Seop Chang
A mathematical model of microbial kinetics was introduced to predict the overall volumetric gas-liquid mass transfer coefficient (kLa) of carbon monoxide (CO) in a batch cultivation system. The cell concentration (X), acetate concentration (Cace), headspace gas (Nco and [Formula: see text] ), dissolved CO concentration in the fermentation medium (Cco), and mass transfer rate (R) were simulated using a variety of kLa values. The simulated results showed excellent agreement with the experimental data for a kLa of 13/hr...
May 6, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28531203/potential-health-gains-for-patients-with-metastatic-renal-cell-carcinoma-in-daily-clinical-practice-a-real-world-cost-effectiveness-analysis-of-sequential-first-and-second-line-treatments
#4
S De Groot, H M Blommestein, W K Redekop, S Sleijfer, L A L M Kiemeney, E Oosterwijk, C A Uyl-de Groot
INTRODUCTION: Randomised controlled trials have shown that targeted therapies like sunitinib are effective in metastatic renal cell carcinoma (mRCC). Little is known about the current use of these therapies, and their associated costs and effects in daily clinical practice. We estimated the real-world cost-effectiveness of different treatment strategies comprising one or more sequentially administered drugs. METHODS: Analyses were performed using patient-level data from a Dutch population-based registry including patients diagnosed with primary mRCC from January 2008 to December 2010 (i...
2017: PloS One
https://www.readbyqxmd.com/read/28531187/multi-scale-computational-study-of-the-mechanical-regulation-of-cell-mitotic-rounding-in-epithelia
#5
Ali Nematbakhsh, Wenzhao Sun, Pavel A Brodskiy, Aboutaleb Amiri, Cody Narciso, Zhiliang Xu, Jeremiah J Zartman, Mark Alber
Mitotic rounding during cell division is critical for preventing daughter cells from inheriting an abnormal number of chromosomes, a condition that occurs frequently in cancer cells. Cells must significantly expand their apical area and transition from a polygonal to circular apical shape to achieve robust mitotic rounding in epithelial tissues, which is where most cancers initiate. However, how cells mechanically regulate robust mitotic rounding within packed tissues is unknown. Here, we analyze mitotic rounding using a newly developed multi-scale subcellular element computational model that is calibrated using experimental data...
May 22, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28530795/modelling-living-cells-response-to-surface-tension-and-chemical-patterns
#6
Marco Macis, Francesca Lugli, Francesco Zerbetto
Mechanobiology is an important epigenetic factor. It influences cell functioning and bears on gene induction, protein synthesis, cell growth and differentiation. In the presence of patterned chemical cues, living cells can take shapes that are far from that of a drop of fluid. These shapes are characterized by inward curvatures that are pinned at the points of location of the cues. The mechano-chemical interactions that orchestrate cell behavior is simulated and controlled by modeling the cells as made by parcels of fluid...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28530245/shifting-the-optimal-stiffness-for-cell-migration
#7
Benjamin L Bangasser, Ghaidan A Shamsan, Clarence E Chan, Kwaku N Opoku, Erkan Tüzel, Benjamin W Schlichtmann, Jesse A Kasim, Benjamin J Fuller, Brannon R McCullough, Steven S Rosenfeld, David J Odde
Cell migration, which is central to many biological processes including wound healing and cancer progression, is sensitive to environmental stiffness, and many cell types exhibit a stiffness optimum, at which migration is maximal. Here we present a cell migration simulator that predicts a stiffness optimum that can be shifted by altering the number of active molecular motors and clutches. This prediction is verified experimentally by comparing cell traction and F-actin retrograde flow for two cell types with differing amounts of active motors and clutches: embryonic chick forebrain neurons (ECFNs; optimum ∼1 kPa) and U251 glioma cells (optimum ∼100 kPa)...
May 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28529671/the-advection-of-microparticles-mcf-7-and-mda-mb-231-breast-cancer-cells-in-response-to-very-low-reynolds-numbers
#8
Sinéad T Morley, Michael T Walsh, David T Newport
The lymphatic system is an extensive vascular network that serves as the primary route for the metastatic spread of breast cancer cells (BCCs). The dynamics by which BCCs travel in the lymphatics to distant sites, and eventually establish metastatic tumors, remain poorly understood. Particle tracking techniques were employed to analyze the behavior of MCF-7 and MDA-MB-231 BCCs which were exposed to lymphatic flow conditions in a 100 μm square microchannel. The behavior of the BCCs was compared to rigid particles of various diameters (η = dp/H= 0...
May 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28529153/model-of-vascular-desmoplastic-multispecies-tumor-growth
#9
Chin F Ng, Hermann B Frieboes
We present a three-dimensional nonlinear tumor growth model composed of heterogeneous cell types in a multicomponent-multispecies system, including viable, dead, healthy host, and extra-cellular matrix (ECM) tissue species. The model includes the capability for abnormal ECM dynamics noted in tumor development, as exemplified by pancreatic ductal adenocarcinoma, including dense desmoplasia typically characterized by a significant increase of interstitial connective tissue. An elastic energy is implemented to provide elasticity to the connective tissue...
May 18, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28528098/the-cell-wall-compound-of-saccharomyces-cerevisiae-as-a-novel-wall-material-for-encapsulation-of-probiotics
#10
Samira Mokhtari, Seid Mahdi Jafari, Morteza Khomeiri, Yahya Maghsoudlou, Mohammad Ghorbani
Yeast cell wall is known as a food grade ingredient which is recently being used increasingly as a novel coating for encapsulation of different materials in the food industry. This application is limited to core materials smaller than yeast in size. In this study, we have tried to encapsulate larger particles by crushing yeast cells. Hence, probiotic bacteria of Lactobacillus acidophilus and Bifidobacterium bifidum were encapsulated firstly by calcium alginate using the emulsion method and these microbeads were coated again by Saccharomyces cerevisiae cell wall compound and another layer of calcium alginate...
June 2017: Food Research International
https://www.readbyqxmd.com/read/28527445/conformations-and-orientational-ordering-of-semiflexible-polymers-in-spherical-confinement
#11
Andrey Milchev, Sergei A Egorov, Arash Nikoubashman, Kurt Binder
Semiflexible polymers in lyotropic solution confined inside spherical nanoscopic "containers" with repulsive walls are studied by molecular dynamics simulations and density functional theory, as a first step to model confinement effects on stiff polymers inside of miniemulsions, vesicles, and cells. It is shown that the depletion effects caused by the monomer-wall repulsion depend distinctly on the radius R of the sphere. Further, nontrivial orientational effects occur when R, the persistence length ℓp, and the contour length L of the polymers are of similar magnitude...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28527398/quantitative-comparison-between-real-space-and-bloch-wave-methods-in-image-simulation
#12
Yi Yang, Qibin Yang, Jianyu Huang, Canying Cai, Jianguo Lin
Both Bloch wave (BW) and real space multislice (RS-MS) methods are based on the Schrödinger equation. The BW method is considered to be the most accurate and popular simulation method used in various simulations, and it has solved many crystallographic problems. In this paper, we verified that the aforementioned two methods are similar to each other with minor difference. First, the RS-MS method is implemented in the real space, while the BW method is carried out in the reciprocal space. Furthermore, by quantitatively calculating exit wavefunctions of four crystals, i...
April 27, 2017: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/28526863/potential-of-pedot-pss-as-a-hole-selective-front-contact-for-silicon-heterojunction-solar-cells
#13
Sara Jäckle, Martin Liebhaber, Clemens Gersmann, Mathias Mews, Klaus Jäger, Silke Christiansen, Klaus Lips
We show that the highly conductive polymer poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) can successfully be applied as a hole selective front contact in silicon heterojunction (SHJ) solar cells. In combination with a superior electron selective heterojunction back contact based on amorphous silicon (a-Si), mono-crystalline n-type silicon (c-Si) solar cells reach power conversion efficiencies up to 14.8% and high open-circuit voltages exceeding 660 mV. Since in the PEDOT:PSS/c-Si/a-Si solar cell the inferior hybrid junction is determining the electrical device performance we are capable of assessing the recombination velocity (v I ) at the PEDOT:PSS/c-Si interface...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28526827/activated-hepatic-stellate-cells-secrete-periostin-to-induce-stem-cell-like-phenotype-of-residual-hepatocellular-carcinoma-cells-after-heat-treatment
#14
Rui Zhang, Rong-Rong Yao, Jing-Huan Li, Gang Dong, Min Ma, Qiong-Dan Zheng, Dong-Mei Gao, Jie-Feng Cui, Zheng-Gang Ren, Rong-Xin Chen
Some evidences show that residual tumor after thermal ablation will progress rapidly. However, its mechanisms remain unclear. Here, we assessed whether activated HSCs could regulate stem cell-like property of residual tumor after incomplete thermal ablation to promote tumor progression. Human HCC cell lines were exposed to sublethal heat treatment to simulate the peripheral zone of thermal ablation. After residual HCC cells were cultured with conditional medium (CM) from activated HSCs, parameters of the stem cell-like phenotypes were analyzed...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28526263/n-stearoyl-l-tyrosine-inhibits-the-cell-senescence-and-apoptosis-induced-by-h2o2-in-hek293-tau-cells-via-the-cb2-receptor
#15
Yue Hu, Kai-Yi Zhou, Ze-Jian Wang, Yang Lu, Ming Yin
Although considerable energy and money have been spent trying to inhibit Aβ production and its related metabolic enzyme activities, there are still no drug treatments available to cure even slow for Alzheimer's disease. Therefore, tau protein has been focused recently as the new target for the treatment of Alzheimer's disease. The transfected human embryonic kidney 293 (HEK 293) cells with or without Tau 411 plasmid were used to evaluate the effect of tau protein on cell viability. H2O2 was added to simulate microenvironment of oxidative stress (OS) during aging...
May 16, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28525896/activation-of-cannabinoid-receptor-type-ii-by-am1241-protects-adipose-derived-mesenchymal-stem-cells-from-oxidative-damage-and-enhances-their-therapeutic-efficacy-in-myocardial-infarction-mice-via-stat3-activation
#16
Dong Han, Xiang Li, Wen-Si Fan, Jiang-Wei Chen, Tian-Tian Gou, Tao Su, Miao-Miao Fan, Meng-Qi Xu, Ya-Bin Wang, Sai Ma, Ya Qiu, Feng Cao
The poor survival of cells in ischemic sites diminishes the therapeutic efficacy of stem cell therapy. Previously we and others have reported that Cannabinoid receptor type II (CB2) is protective during heart ischemic injury for its anti-oxidative activity. However, whether CB2 activation could improve the survival and therapeutic efficacy of stem cells in ischemic myocardium and the underlying mechanisms remain elusive. Here, we showed evidence that CB2 agonist AM1241 treatment could improve the functional survival of adipose-derived mesenchymal stem cells (AD-MSCs) in vitro as well as in vivo...
May 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28525842/indole-coumarin-thiadiazole-hybrids-an-appraisal-of-their-mcf-7%C3%A2-cell-growth-inhibition-apoptotic-antimetastatic-and-computational-bcl-2-binding-potential
#17
Pooja R Kamath, Dhanya Sunil, Manu M Joseph, Abdul Ajees Abdul Salam, Sreelekha T T
Cancer therapeutic potential of thiadiazole hybrids incorporating pharmacologically active indole and coumarin moieties have not been explored much. In the current investigation, three new thiadiazole hybrids with spacers of varying lengths linking indole and thiadiazole units were synthesized and their structures were well-established using various spectroscopic techniques. 3-(1-(5-(3-(1H-indol-3-yl)propyl)-1,3,4-thiadiazol-2-ylimino)ethyl)-6-bromo-2H-chromen-2-one (IPTBC) exhibited dose-dependent cytotoxicity in breast adenocarcinoma (MCF-7) cells...
May 11, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28525258/bioavailability-of-soil-sorbed-tetracycline-to-escherichia-coli-under-unsaturated-conditions
#18
Zeyou Chen, Wei Zhang, Gang Wang, Yingjie Zhang, Yanzheng Gao, Stephen A Boyd, Brian J Teppen, James M Tiedje, Dongqiang Zhu, Hui Li
Increasing concentrations of anthropogenic antibiotics in soils are partly responsible for the proliferation of bacterial antibiotic resistance. However, little is known about how soil-sorbed antibiotics exert selective pressure on bacteria in unsaturated soils. This study investigated the bioavailability of tetracycline sorbed on three soils (Webster clay loam, Capac sandy clay loam, and Oshtemo loamy sand) to a fluorescent Escherichia coli bioreporter under unsaturated conditions using agar diffusion assay, microscopic visualization, and model simulation...
May 19, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28524679/transition-from-collisional-to-collisionless-regimes-in-interpenetrating-plasma-flows-on-the-national-ignition-facility
#19
J S Ross, D P Higginson, D Ryutov, F Fiuza, R Hatarik, C M Huntington, D H Kalantar, A Link, B B Pollock, B A Remington, H G Rinderknecht, G F Swadling, D P Turnbull, S Weber, S Wilks, D H Froula, M J Rosenberg, T Morita, Y Sakawa, H Takabe, R P Drake, C Kuranz, G Gregori, J Meinecke, M C Levy, M Koenig, A Spitkovsky, R D Petrasso, C K Li, H Sio, B Lahmann, A B Zylstra, H-S Park
A study of the transition from collisional to collisionless plasma flows has been carried out at the National Ignition Facility using high Mach number (M>4) counterstreaming plasmas. In these experiments, CD-CD and CD-CH planar foils separated by 6-10 mm are irradiated with laser energies of 250 kJ per foil, generating ∼1000  km/s plasma flows. Varying the foil separation distance scales the ion density and average bulk velocity and, therefore, the ion-ion Coulomb mean free path, at the interaction region at the midplane...
May 5, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28524659/synthesis-molecular-docking-molecular-dynamics-studies-and-biological-evaluation-of-4h-chromone-1-2-3-4-tetrahydropyrimidine-5-carboxylate-derivatives-as-potential-anti-leukemic-agents
#20
Zahra Dolatkhah, Shahrzad Javanshir, Ahmad Shahir Sadr, Jaber Hosseini, Soroush Sardari
Series of 4H-chromone-1,2,3,4-tetrahydropyrimidine-5-carboxylates derivatives were synthesized via a three component one-pot condensation of chromone-3-carbaldehyde, alkyl acetoacetate and urea or thiourea, using MCM-41-SO3H as an efficient Nano-catalysts, and evaluated for their anti-cancer activity using a combined in silico docking and molecular dynamics protocol to estimate the binding affinity of the title compounds with the Bcr-Abl oncogene. Two programs, AutoDock 4 and AutoDock Vina software were applied to dock the target protein with synthesized compounds and ATP...
May 19, 2017: Journal of Chemical Information and Modeling
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