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https://www.readbyqxmd.com/read/28110445/non-invasive-photodynamic-therapy-in-brain-cancer-by-use-of-tb-3-doped-laf3-nanoparticles-in-combination-with-photosensitizer-through-x-ray-irradiation-a-proof-of-concept-study
#1
Min-Hua Chen, Yi-Jhen Jenh, Sheng-Kai Wu, Yo-Shen Chen, Nobutaka Hanagata, Feng-Huei Lin
The use of photodynamic therapy (PDT) in the treatment of brain cancer has produced exciting results in clinical trials over the past decade. PDT is based on the concept that a photosensitizer exposed to a specific light wavelength produces the predominant cytotoxic agent, to destroy tumor cells. However, delivering an efficient light source to the brain tumor site is still a challenge. The light source should be delivered by placing external optical fibers into the brain at the time of surgical debulking of the tumor...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28109235/the-impact-of-long-range-electron-hole-interaction-on-the-charge-separation-yield-of-molecular-photocells
#2
Tahereh Nemati Aram, Matthias Ernzerhof, Asghar Asgari, Didier Mayou
We discuss the effects of charge carrier interaction and recombination on the operation of molecular photocells. Molecular photocells are devices where the energy conversion process takes place in a single molecular donor-acceptor complex attached to electrodes. Our investigation is based on the quantum scattering theory, in particular on the Lippmann-Schwinger equation; this minimizes the complexity of the problem while providing useful and non-trivial insight into the mechanism governing photocell operation...
January 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28107811/biomimetic-versus-sintered-calcium-phosphates-the-in-vitro-behavior-of-osteoblasts-and-mesenchymal-stem-cells
#3
Joanna Maria Sadowska, Jordi Guillem-Marti, Edgar B Montufar, Montserrat Espanol, Maria-Pau Ginebra
The fabrication of calcium phosphates using biomimetic routes, namely, precipitation processes at body temperature, results in distinct features compared to conventional sintered calcium phosphate ceramics, such as a high specific surface area and micro or nanometric crystal size. The aim of this paper is to analyze the effects of these parameters on cell response, focusing on two bone cell types: rat mesenchymal stem cells (rMSCs) and human osteoblastic cells (SaOS-2). Biomimetic calcium deficient hydroxyapatite (CDHA) was obtained by a low temperature setting reaction, and α-tricalcium phosphate (α-TCP) and β- tricalcium phosphate (β-TCP) were subsequently obtained by sintering CDHA either at 1400 °C or 1100 °C...
January 20, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28107660/guided-growth-of-auditory-neurons-bioactive-particles-towards-gapless-neural-electrode-interface
#4
Hao Li, Fredrik Edin, Hisamitsu Hayashi, Olafur Gudjonsson, Niklas Danckwardt-Lillieström, Håkan Engqvist, Helge Rask-Andersen, Wei Xia
Cochlear implant (CI) is a successful device to restore hearing. Despite continuous development, frequency discrimination is poor in CI users due to an anatomical gap between the auditory neurons and CI electrode causing current spread and unspecific neural stimulation. One strategy to close this anatomical gap is guiding the growth of neuron dendrites closer to CI electrodes through targeted slow release of neurotrophins. Biodegradable calcium phosphate hollow nanospheres (CPHSs) were produced and their capacity for uptake and release of neurotrophins investigated using (125)I-conjugated glia cell line-derived neurotrophic factor (GDNF)...
December 23, 2016: Biomaterials
https://www.readbyqxmd.com/read/28107420/the-polyherbal-wattana-formula-displays-anti-amyloidogenic-properties-by-increasing-%C3%AE-secretase-activities
#5
Htut Htut Htoo, Suveerawan Limsuvan, Onusa Thamsermsang, Jean-François Hernandez, Frédéric Checler, Piyarat Govitrapong, Narawut Pakaprot, Pravit Akarasereenont, Bruno Vincent
Alzheimer's disease is characterized by the deposition of insoluble amyloid-β peptides produced from the β-amyloid precursor protein (βAPP). Because α-secretase cleavage by ADAM10 and ADAM17 takes place in the middle of Aβ, its activation is considered as a promising anti-AD therapeutic track. Here we establish that the polyherbal Wattana formula (WNF) stimulates sAPPα production in cells of neuronal and non-neuronal origins through an increase of both ADAM10 and ADAM17 catalytic activities with no modification of BACE1 activity and expression...
2017: PloS One
https://www.readbyqxmd.com/read/28107008/robust-sensitive-and-automated-phosphopeptide-enrichment-optimized-for-low-sample-amounts-applied-to-primary-hippocampal-neurons
#6
Harm Post, Renske Penning, Martin A Fitzpatrick, Luc B Garrigues, W Wu, Harold D MacGillavry, Casper C Hoogenraad, Albert J R Heck, A F Maarten Altelaar
Because of the low stoichiometry of protein phosphorylation, targeted enrichment prior to LC-MS/MS analysis is still essential. The trend in phosphoproteome analysis is shifting toward an increasing number of biological replicates per experiment, ideally starting from very low sample amounts, placing new demands on enrichment protocols to make them less labor-intensive, more sensitive, and less prone to variability. Here we assessed an automated enrichment protocol using Fe(III)-IMAC cartridges on an AssayMAP Bravo platform to meet these demands...
December 6, 2016: Journal of Proteome Research
https://www.readbyqxmd.com/read/28105339/analysis-of-multiple-types-of-human-cells-subsequent-to-bioprinting-with-electrospraying-technology
#7
Yu Xin, Gang Chai, Ting Zhang, Xiangsheng Wang, Miao Qu, Andy Tan, Melia Bogari, Ming Zhu, Li Lin, Qingxi Hu, Yuanyuan Liu, Yan Zhang
The aim of the present study was to investigate bioprinting with electrospraying technology using multiple types of human cell suspensions as bio-ink, in order to lay the initial foundations for the application of the bioprinting technology in tissue engineering. In the current study, six types of human cells were selected and cultured, including human fibroblasts, human adipose-derived stem cells (hADSCs), human periodontal ligament cells (HPDLCs), adult human retinal pigment epithelial cells (ARPE-19), human umbilical vascular endothelial cells (HUVECs) and human gastric epithelial cell line (GES-1)...
December 2016: Biomedical Reports
https://www.readbyqxmd.com/read/28104670/mutants-for-drosophila-isocitrate-dehydrogenase-3b-are-defective-in-mitochondrial-function-and-larval-cell-death
#8
Dianne M Duncan, Paula Kiefel, Ian Duncan
The death of larval salivary gland cells during metamorphosis in Drosophila melanogaster has been a key system for studying steroid controlled programmed cell death. This death is induced by a pulse of the steroid hormone ecdysone that takes place at the end of the prepupal period. For many years, it has been thought that the ecdysone direct response gene Eip93F (E93) plays a critical role in initiating salivary gland cell death. This conclusion was based largely on the finding that the three "type" alleles of E93 cause a near-complete block in salivary gland cell death...
January 18, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28104377/changes-in-lipid-bilayer-structure-caused-by-the-helix-to-sheet-tansition-of-an-hiv-1-gp41-fusion-peptide-derivative
#9
William T Heller, Durgesh K Rai
HIV-1, like other enveloped viruses, undergoes fusion with the cell membrane to infect it. Viral coat proteins are thought to bind the virus to the membrane and actively fuse the viral and cellular membranes together. The actual molecular mechanism of fusion is challenging to visualize, resulting in the use of model systems. Here, the bilayer curvature modifying properties of a synthetic variant of the HIV-1 gp41 fusion peptide with lipid bilayer vesicles composed of a mixture of dimyristoyl phosphatidylcholine (DMPC) and dimyristoyl phosphatidylserine (DMPS) were studied...
January 16, 2017: Chemistry and Physics of Lipids
https://www.readbyqxmd.com/read/28103665/computational-search-for-novel-hard-chromium-based-materials
#10
Alexander G Kvashnin, Artem R Oganov, Artem I Samtsevich, Zahed Allahyari
Nitrides, carbides and borides of transition metals are an attractive class of hard materials. Our recent preliminary explorations of the binary chemical compounds indicated that chromium-based materials are among the hardest transition metal compounds. Motivated by this, here we explore in detail the binary Cr-B, Cr-C and Cr-N systems using global optimization techniques. Calculated enthalpy of formation and hardness of predicted materials were used for Pareto optimization to define the hardest materials with lowest energy...
January 20, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28103492/a-novel-type-of-gene-interaction-in-d-melanogaster
#11
B F Chadov, E V Chadova, N B Fedorova
The genes interact according to classical mechanisms, namely, complementation, modification, polymery, and epistasis, in the cells and organisms carrying these genes. Here we describe a novel type of gene interaction when the interacting genes reside in parents, whereas the interaction event takes place in their progenies lacking these genes. The conditional mutations in the D. melanogaster male X chromosome caused the "prohibition on producing daughters" in its offspring. The chromosomal rearrangements in chromosomes 2 and 3 of its female partner removed the prohibition...
January 11, 2017: Mutation Research
https://www.readbyqxmd.com/read/28103300/expression-profiling-of-ribosome-biogenesis-factors-reveals-nucleolin-as-a-novel-potential-marker-to-predict-outcome-in-aml-patients
#12
Virginie Marcel, Frédéric Catez, Caroline M Berger, Emeline Perrial, Adriana Plesa, Xavier Thomas, Eve Mattei, Sandrine Hayette, Pierre Saintigny, Philippe Bouvet, Jean-Jacques Diaz, Charles Dumontet
Acute myeloid leukemia (AML) is a heterogeneous disease. Prognosis is mainly influenced by patient age at diagnosis and cytogenetic alterations, two of the main factors currently used in AML patient risk stratification. However, additional criteria are required to improve the current risk classification and better adapt patient care. In neoplastic cells, ribosome biogenesis is increased to sustain the high proliferation rate and ribosome composition is altered to modulate specific gene expression driving tumorigenesis...
2017: PloS One
https://www.readbyqxmd.com/read/28103270/cold-atmospheric-plasma-created-at-the-tip-of-an-elongated-flexible-capillary-using-low-electric-current-can-slow-the-progression-of-melanoma
#13
Y Binenbaum, G Ben-David, Z Gil, Ya Z Slutsker, M A Ryzhkov, J Felsteiner, Ya E Krasik, J T Cohen
INTRODUCTION: Cold Atmospheric Plasma Jet (CAPJ), with ion temperature close to room temperature, has tremendous potential in biomedical engineering, and can potentially offer a therapeutic option that allows cancer cell elimination without damaging healthy tissue. We developed a hand-held flexible device for the delivery of CAPJ to the treatment site, with a modified high-frequency pulse generator operating at a RMS voltage of <1.2 kV and gas flow in the range 0.3-3 l/min. The aims of our study were to characterize the CAPJ emitted from the device, and to evaluate its efficacy in elimination of cancer cells in-vitro and in-vivo...
2017: PloS One
https://www.readbyqxmd.com/read/28102368/novel-electron-phonon-relaxation-pathway-in-graphite-revealed-by-time-resolved-raman-scattering-and-angle-resolved-photoemission-spectroscopy
#14
Jhih-An Yang, Stephen Parham, Daniel Dessau, Dmitry Reznik
Time dynamics of photoexcited electron-hole pairs is important for a number of technologies, in particular solar cells. We combined ultrafast pump-probe Raman scattering and photoemission to directly follow electron-hole excitations as well as the G-phonon in graphite after an excitation by an intense laser pulse. This phonon is known to couple relatively strongly to electrons. Cross-correlating effective electronic and phonon temperatures places new constraints on model-based fits. The accepted two-temperature model predicts that G-phonon population should start to increase as soon as excited electron-hole pairs are created and that the rate of increase should not depend strongly on the pump fluence...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28100778/structure-of-the-z-ring-associated-protein-zapd-bound-to-the-c-terminal-domain-of-the-tubulin-like-protein-ftsz-suggests-mechanism-of-z-ring-stabilization-through-ftsz-crosslinking
#15
Maria Schumacher, Kuo-Hsiang Huang, Wenjie Zeng, Anuradha Janakiraman
Cell division in most bacteria is mediated by the tubulin-like FtsZ protein, which polymerizes in a GTP-dependent manner to form the cytokinetic Z ring. A diverse repertoire of FtsZ binding proteins affect FtsZ localization and polymerization to ensure correct Z ring formation. Many of these proteins bind the C-terminal domain (CTD) of FtsZ, which serves as a hub for FtsZ regulation. FtsZ ring-associated proteins, ZapA-D (Zaps), are important FtsZ regulatory proteins that stabilize FtsZ assembly and enhance Z ring formation by increasing lateral assembly of FtsZ protofilaments, which then form the Z ring...
January 18, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28100665/co-option-of-bacteriophage-lysozyme-genes-by-bivalve-genomes
#16
Qian Ren, Chunyang Wang, Min Jin, Jiangfeng Lan, Ting Ye, Kaimin Hui, Jingmin Tan, Zheng Wang, Gerald J Wyckoff, Wen Wang, Guan-Zhu Han
Eukaryotes have occasionally acquired genetic material through horizontal gene transfer (HGT). However, little is known about the evolutionary and functional significance of such acquisitions. Lysozymes are ubiquitous enzymes that degrade bacterial cell walls. Here, we provide evidence that two subclasses of bivalves (Heterodonta and Palaeoheterodonta) acquired a lysozyme gene via HGT, building on earlier findings. Phylogenetic analyses place the bivalve lysozyme genes within the clade of bacteriophage lysozyme genes, indicating that the bivalves acquired the phage-type lysozyme genes from bacteriophages, either directly or through intermediate hosts...
January 2017: Open Biology
https://www.readbyqxmd.com/read/28100648/multi-scale-structural-analysis-of-plant-er-pm-contact-sites
#17
Heather E McFarlane, Eun Kyoung Lee, Laura S van Bezouwen, Bradford Ross, Abel Rosado, A Lacey Samuels
Membrane contact sites (MCS) are recognized across eukaryotic systems as important nanostructures. Endoplasmic reticulum (ER)-plasma membrane (PM) contact sites (EPCS) are involved in excitation-contraction coupling, signalling, and plant responses to stress. In this report, we perform a multi-scale structural analysis of Arabidopsis EPCS that combine live cell imaging, quantitative transmission electron microscopy (TEM), and electron tomography over a developmental gradient. To place EPCS in the context of the entire cortical ER, we examined GFP-HDEL in living cells over a developmental gradient, then SYT1-GFP was used as a specific marker of EPCS...
January 18, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28100634/cryptochromes-regulate-igf-1-production-and-signaling-through-control-jak2-dependent-stat5b-phosphorylation
#18
Amol Chaudhari, Richa Gupta, Sonal Patel, Nikkhil Velingkaar, Roman Kondratov
Insulin like growth factor (IGF) signaling plays an important role in cell growth and proliferation and implicated in regulation of cancer, metabolism and aging. Here we report that IGF-1 level in blood and IGF-1 signaling demonstrates circadian rhythms. Circadian control occurs through Cryptochromes (CRYs), transcriptional repressors and components of the circadian clock. IGF-1 rhythms are disrupted in Cry deficient mice and IGF-1 level is reduced by 80% in these mice, which leads to reduced IGF signaling...
January 18, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28100618/influence-of-the-envelope-gp120-phe-43-cavity-on-hiv-1-sensitivity-to-adcc-responses
#19
Jérémie Prévost, Daria Zoubchenok, Jonathan Richard, Maxime Veillette, Beatriz Pacheco, Mathieu Coutu, Nathalie Brassard, Matthew S Parsons, Kiat Ruxrungtham, Torsak Bunupuradah, Sodsai Tovanabutra, Kwan-Ki Hwang, M Anthony Moody, Barton F Haynes, Mattia Bonsignori, Joseph Sodroski, Daniel E Kaufmann, George M Shaw, Agnès L Chenine, Andrés Finzi
: HIV-1-infected cells presenting envelope glycoproteins (Env) in the CD4-bound conformation on their surface are preferentially targeted by antibody-dependent cellular-mediated cytotoxicity (ADCC). HIV-1 has evolved sophisticated mechanisms to avoid exposure of Env ADCC epitopes by downregulating CD4 and by limiting the overall amount of Env on the cell surface. In HIV-1, substitution of large residues such as histidine or tryptophan for serine 375 (S375H/W) in the gp120 Phe 43 cavity, where Phe 43 of CD4 contacts gp120, results in the spontaneous sampling of an Env conformation closer to CD4-bound state...
January 18, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28100580/venetoclax-in-patients-with-previously-treated-chronic-lymphocytic-leukemia
#20
Andrew W Roberts, Stephan Stilgenbauer, John F Seymour, David C S Huang
Venetoclax is the first BCL2 inhibitor to enter routine clinical practice. It is an orally bioavailable small molecule that binds BCL2 very specifically. Acting as a pharmacological mimic of the proteins that initiate apoptosis (a so-called BH3-mimetic), venetoclax rapidly induces apoptosis in chronic lymphocytic leukemia (CLL) cells which express high levels of BCL2 and rely on it to maintain their survival. As a single agent, daily venetoclax treatment induced durable responses in 79% of patients with relapsed or refractory CLL or small lymphocytic lymphoma in a Phase 1 study, including complete remissions in 20% of patients...
January 18, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
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