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https://www.readbyqxmd.com/read/29151208/strategies-for-efficient-sample-preparation-for-dynamic-nuclear-polarization-solid-state-nmr-of-biological-macromolecules
#1
Boris Itin, Ivan V Sergeyev
Solid-state NMR (SSNMR) is a powerful tool for the elucidation of structure and dynamics in biological macromolecules. Over the years, SSNMR spectroscopists have developed an array of techniques enabling the measurement of internuclear correlations, distances, and torsional angles; these have been applied to the study of a number of biological systems that are difficult to study by X-ray crystallography and solution NMR, including key biological targets such as membrane proteins and amyloid fibrils. Applications of SSNMR to other topic areas, including materials science, pharmaceuticals, and small molecules, have also flourished in recent years...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29151198/high-substance-use-and-hiv-risk-behavior-among-young-argentine-men-who-have-sex-with-men
#2
Iván C Balán, Timothy Frasca, María A Pando, Rubén O Marone, Victoria Barreda, Curtis Dolezal, Alex Carballo-Diéguez, María M Ávila
In the United States young men who have sex with men have higher rates of substance use, higher HIV incidence, and less frequent HIV testing than their heterosexual counterparts and older MSM. Less is known about comparable populations in Latin America. As part of an epidemiological study, MSM were recruited through Respondent Driven Sampling in the metropolitan area of Buenos Aires, Argentina and answered a computerized behavioral survey. From the total of 500 MSM enrolled, a sub-sample of 233 aged 18-25 was analyzed...
November 18, 2017: AIDS and Behavior
https://www.readbyqxmd.com/read/29151085/a-novel-mutation-in-the-critical-p-box-residue-of-steroidogenic-factor-1-presenting-with-xy-sex-reversal-and-transient-adrenal-failure
#3
Anna S Orekhova, Natalia Kalinchenko, Ivan A Morozov, Evgeny V Vasilyev, Petr M Rubtsov, Ivan I Dedov, Anatoly Tiulpakov
BACKGROUND: Although the importance of steroidogenic factor-1 (SF1, NR5A1) for adrenal development is supported by numerous in vitro and in vivo studies, cases of SF1 deficiency associated with adrenal failure are exceptionally rare. The first human NR5A1 mutation was a heterozygous de novo p.G35E variant identified in a patient with disorder of sex development (DSD) 46,XY and primary adrenal insufficiency. Here we describe another association of the "classic" SF1 phenotype with a novel NR5A1 mutation affecting G35 residue...
November 17, 2017: Hormone Research in Pædiatrics
https://www.readbyqxmd.com/read/29151047/interpretation-of-health-news-items-reported-with-or-without-spin-protocol-for-a-prospective-meta-analysis-of-16-randomised-controlled-trials
#4
Romana Haneef, Amélie Yavchitz, Philippe Ravaud, Gabriel Baron, Ivan Oranksy, Gary Schwitzer, Isabelle Boutron
INTRODUCTION: We aim to compare the interpretation of health news items reported with or without spin. 'Spin' is defined as a misrepresentation of study results, regardless of motive (intentionally or unintentionally) that overemphasises the beneficial effects of the intervention and overstates safety compared with that shown by the results. METHODS AND ANALYSIS: We have planned a series of 16 randomised controlled trials (RCTs) to perform a prospective meta-analysis...
November 17, 2017: BMJ Open
https://www.readbyqxmd.com/read/29150352/dysregulation-of-mrna-translation-and-energy-metabolism-in-cancer
#5
REVIEW
Matthew Leibovitch, Ivan Topisirovic
Dysregulated mRNA translation and aberrant energy metabolism are frequent in cancer. Considering that mRNA translation is an energy demanding process, cancer cells must produce sufficient ATP to meet energy demand of hyperactive translational machinery. In recent years, the mammalian/mechanistic target of rapamycin (mTOR) emerged as a central regulatory node which coordinates energy consumption by the translation apparatus and ATP production in mitochondria. Aberrant mTOR signaling underpins the vast majority of cancers whereby increased mTOR activity is thought to be a major determinant of both malignant translatomes and metabolomes...
November 2, 2017: Advances in Biological Regulation
https://www.readbyqxmd.com/read/29150187/-137-cs-in-mushrooms-from-croatia-sampled-15-30-years-after-chernobyl
#6
Ivana Tucaković, Delko Barišić, Željko Grahek, Ante Kasap, Ivan Širić
The aim of this study was to select species with higher potential to accumulate (137)Cs among the available mushroom species, by determining the activity concentrations of (137)Cs in mushrooms collected along north and north-western part of Croatia. A total of 55 samples of 14 different species were analyzed and the potential of mycorrhizal and saprotrophic species to accumulate (137)Cs was compared. A wide range of the dry weight activity concentrations of (137)Cs was detected, ranging from 0.95 to 1210 Bq/kg (154 Bq/kg mean value; 52...
November 14, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/29149906/forebrain-specific-conditional-silencing-of-staufen2-alters-synaptic-plasticity-learning-and-memory-in-rats
#7
Stefan M Berger, Iván Fernández-Lamo, Kai Schönig, Sandra M Fernández Moya, Janina Ehses, Rico Schieweck, Stefano Clementi, Thomas Enkel, Sascha Grothe, Oliver von Bohlen Und Halbach, Inmaculada Segura, José María Delgado-García, Agnès Gruart, Michael A Kiebler, Dusan Bartsch
BACKGROUND: Dendritic messenger RNA (mRNA) localization and subsequent local translation in dendrites critically contributes to synaptic plasticity and learning and memory. Little is known, however, about the contribution of RNA-binding proteins (RBPs) to these processes in vivo. RESULTS: To delineate the role of the double-stranded RBP Staufen2 (Stau2), we generate a transgenic rat model, in which Stau2 expression is conditionally silenced by Cre-inducible expression of a microRNA (miRNA) targeting Stau2 mRNA in adult forebrain neurons...
November 17, 2017: Genome Biology
https://www.readbyqxmd.com/read/29149721/biological-safety-and-tissue-distribution-of-16-mercaptohexadecyl-trimethylammonium-bromide-modified-cationic-gold-nanorods
#8
Monika Zarska, Michal Sramek, Filip Novotny, Filip Havel, Andrea Babelova, Blanka Mrazkova, Oldrich Benada, Milan Reinis, Ivan Stepanek, Kamil Musilek, Jiri Bartek, Monika Ursinyova, Ondrej Novak, Rastislav Dzijak, Kamil Kuca, Jan Proska, Zdenek Hodny
The exceptionally high cellular uptake of gold nanorods (GNRs) bearing cationic surfactants makes them a promising tool for biomedical applications. Given the known specific toxic and stress effects of some preparations of cationic nanoparticles, the purpose of this study was to evaluate, in an in vitro and in vivo in mouse, the potential harmful effects of GNRs coated with (16-mercaptohexadecyl)trimethylammonium bromide ((MTAB)GNRs). Interestingly, even after cellular accumulation of high amounts of (MTAB)GNRs sufficient for induction of photothermal effect, no genotoxicity (even after longer-term accumulation), induction of autophagy, destabilization of lysosomes (dominant organelles of their cellular destination), alterations of actin cytoskeleton, or in cell migration could be detected in vitro...
November 1, 2017: Biomaterials
https://www.readbyqxmd.com/read/29149542/spectrally-encoded-coherence-tomography-and-reflectometry-sectr-simultaneous-en-face-and-cross-sectional-imaging-at-2-gigapixels-per-second
#9
Mohamed T El-Haddad, Ivan Bozic, Yuankai K Tao
Non-invasive biological imaging is crucial for understanding in vivo structure and function. Optical coherence tomography (OCT) and reflectance confocal microscopy are two of the most widely used optical modalities for exogenous contrast-free high-resolution three-dimensional imaging in non-fluorescent scattering tissues. However, sample motion remains a critical barrier to raster-scanned acquisition and reconstruction of wide-field anatomically accurate volumetric datasets. We introduce spectrally encoded coherence tomography and reflectometry (SECTR), a high-speed multimodality system for simultaneous OCT and spectrally-encoded reflectance (SER) imaging...
November 17, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/29149419/changes-in-chromatin-state-reveal-arnt2-at-a-node-of-a-tumorigenic-transcription-factor-signature-driving-glioblastoma-cell-aggressiveness
#10
Alexandra Bogeas, Ghislaine Morvan-Dubois, Elias A El-Habr, François-Xavier Lejeune, Matthieu Defrance, Ashwin Narayanan, Klaudia Kuranda, Fanny Burel-Vandenbos, Salwa Sayd, Virgile Delaunay, Luiz G Dubois, Hugues Parrinello, Stéphanie Rialle, Sylvie Fabrega, Ahmed Idbaih, Jacques Haiech, Ivan Bièche, Thierry Virolle, Michele Goodhardt, Hervé Chneiweiss, Marie-Pierre Junier
Although a growing body of evidence indicates that phenotypic plasticity exhibited by glioblastoma cells plays a central role in tumor development and post-therapy recurrence, the master drivers of their aggressiveness remain elusive. Here we mapped the changes in active (H3K4me3) and repressive (H3K27me3) histone modifications accompanying the repression of glioblastoma stem-like cells tumorigenicity. Genes with changing histone marks delineated a network of transcription factors related to cancerous behavior, stem state, and neural development, highlighting a previously unsuspected association between repression of ARNT2 and loss of cell tumorigenicity...
November 17, 2017: Acta Neuropathologica
https://www.readbyqxmd.com/read/29148897/oxidative-stress-response-in-sh-sy5y-cells-exposed-to-short-term-1800%C3%A2-mhz-radiofrequency-radiation
#11
Ana Marija Marjanovic Cermak, Ivan Pavicic, Ivancica Trosic
The exact mechanism that could explain the effects of radiofrequency (RF) radiation exposure at non-thermal level is still unknown. Increasing evidence suggests a possible involvement of reactive oxygen species (ROS) and development of oxidative stress. To test the proposed hypothesis, human neuroblastoma cells (SH-SY5Y) were exposed to 1800 MHz short-term RF exposure for 10, 30 and 60 minutes. Electric field strength within Gigahertz Transverse Electromagnetic cell (GTEM) was 30 V m(-1) and specific absorption rate (SAR) was calculated to be 1...
November 17, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29148815/information-theoretic-approaches-to-atoms-in-molecules-hirshfeld-family-of-partitioning-schemes
#12
Farnaz Heidar-Zadeh, Paul Woodson Ayers, Toon Verstraelen, Ivan Vinogradov, Esteban Vöhringer-Martinez, Patrick Bultinck
Many population analysis methods are based on the precept that molecules should be built from fragments (typically atoms) that maximally resemble the isolated fragment. The resulting molecular building blocks are intuitive (because they maximally resemble well-understood systems) and transferable (because if two molecular fragments both resemble an isolated fragment, they necessarily resemble each other). Information theory is one way to measure the deviation between molecular fragments and their isolated counterparts, and one that lends itself to analysis...
November 17, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29148738/interfacial-electrochemistry-in-liquids-probed-with-photoemission-electron-microscopy
#13
Slavomir Nemšák, Evgheni Strelcov, Tomáš Duchoň, Hongxuan Guo, Johanna Hackl, Alexander Yulaev, Ivan Vlassiouk, David N Mueller, Claus M Schneider, Andrei Kolmakov
Studies of the electrified solid-liquid interfaces are crucial for the understanding of the biological and electrochemical systems. Until recently, the use of photoemission electron microscopy (PEEM) for such purposes has been hampered by the incompatibility of the liquid samples with ultra-high vacuum environment of the electron optics and detector. Here we demonstrate that the use of ultra-thin electron transparent graphene membranes, which can sustain large pressure differentials and act as a working electrode, makes it possible to probe electrochemical reactions in operando in liquid environments with PEEM...
November 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29148709/nir-emitting-nanoprobes-based-on-cyclic-rgd-motif-conjugated-pbs-quantum-dots-for-integrin-targeted-optical-bioimaging
#14
Nicoletta Depalo, Michela Corricelli, Ivan de Paola, Gianpiero Valente, Rosa M Iacobazzi, Emiliano Altamura, Doriana Debellis, Daniela Comegna, Elisabetta Fanizza, Nunzio Denora, Valentino Laquintana, Fabio Mavelli, Marinella Striccoli, Michele Saviano, Angela Agostiano, Annarita Del Gatto, Laura Zaccaro, Maria Lucia Curri
Here, silica coated PbS quantum dots (QDs) with photoluminesce emission properties in the near-infrared (NIR) region are proposed as potential effective single particle optical nanoprobes for future in vivo imaging of tumors. The dispersibility in aqueous medium of hydrophobic PbS QDs was accomplished by growing a silica shell on their surface by exploiting a base assisted water-in-oil microemulsion method. The silica coated PbS QDs were then conjugated with specifically designed cyclic arginine-glycine-aspartic acid (cRGD) peptide, that are able to specifically recognizes the αvβ3 integrins which is overexpressed in the angiogenic tumor induced vasculatures and on some solid tumours, in order to achieve a tumor-specific targeting...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29147764/prospective-evaluation-of-18-f-facbc-pet-ct-and-pet-mri-versus-multiparametric-mri-in-intermediate-to-high-risk-prostate-cancer-patients-flucipro-trial
#15
Ivan Jambor, Anna Kuisma, Esa Kähkönen, Jukka Kemppainen, Harri Merisaari, Olli Eskola, Jarmo Teuho, Ileana Montoya Perez, Marko Pesola, Hannu J Aronen, Peter J Boström, Pekka Taimen, Heikki Minn
PURPOSE: The purpose of this study was to evaluate (18)F-FACBC PET/CT, PET/MRI, and multiparametric MRI (mpMRI) in detection of primary prostate cancer (PCa). METHODS: Twenty-six men with histologically confirmed PCa underwent PET/CT immediately after injection of 369 ± 10 MBq (18)F-FACBC (fluciclovine) followed by PET/MRI started 55 ± 7 min from injection. Maximum standardized uptake values (SUVmax) were measured for both hybrid PET acquisitions. A separate mpMRI was acquired within a week of the PET scans...
November 16, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/29147616/mrna-expression-levels-of-genes-involved-in-antitumor-immunity-identification-of-a-3-gene-signature-associated-with-prognosis-of-muscle-invasive-bladder-cancer
#16
Constance Le Goux, Sophie Vacher, Géraldine Pignot, Mathilde Sibony, Nicolas Barry Delongchamps, Benoit Terris, Eliane Piaggio, Marc Zerbib, Diane Damotte, Ivan Bieche
Immunotherapy for bladder cancer has given promising results. Here we aimed to evaluate the possible involvement and prognostic value of 33 genes involved in the immune response during bladder carcinogenesis. Expression levels were assessed by quantitative real-time RT-PCR in normal and tumor human bladder samples. Immunohistochemistry was performed to evaluate the protein expression of 2 genes and relation of the mRNA and protein levels was analyzed. Tumors were obtained from 154 patients (83 with muscle-invasive bladder cancer [MIBC] and 71 non-MIBC [NMIBC]) who underwent transurethral bladder resection or radical cystectomy between 2002 and 2006...
2017: Oncoimmunology
https://www.readbyqxmd.com/read/29147547/multi-dimensional-charge-transport-in-supramolecular-helical-foldamer-assemblies
#17
Alejandro Méndez-Ardoy, Nagula Markandeya, Xuesong Li, Yu-Tang Tsai, Gilles Pecastaings, Thierry Buffeteau, Victor Maurizot, Luca Muccioli, Frédéric Castet, Ivan Huc, Dario M Bassani
Aromatic foldamers are bioinspired architectures whose potential use in materials remains largely unexplored. Here we report our investigation of vertical and horizontal charge transport over long distances in helical oligo-quinolinecarboxamide foldamers organized as single monolayers on Au or SiO2. Conductive atomic force microscopy showed that vertical conductivity is efficient and that it displays a low attenuation with foldamer length (0.06 Å(-1)). In contrast, horizontal charge transport is found to be negligible, demonstrating the strong anisotropy of foldamer monolayers...
October 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29147531/catalysis-of-a-1-3-dipolar-reaction-by-distorted-dna-incorporating-a-heterobimetallic-platinum-ii-and-copper-ii-complex
#18
Iván Rivilla, Abel de Cózar, Thomas Schäfer, Frank J Hernandez, Alexander M Bittner, Aitziber Eleta-Lopez, Ali Aboudzadeh, José I Santos, José I Miranda, Fernando P Cossío
A novel catalytic system based on covalently modified DNA is described. This catalyst promotes 1,3-dipolar reactions between azomethine ylides and maleimides. The catalytic system is based on the distortion of the double helix of DNA by means of the formation of Pt(ii) adducts with guanine units. This distortion, similar to that generated in the interaction of DNA with platinum chemotherapeutic drugs, generates active sites that can accommodate N-metallated azomethine ylides. The proposed reaction mechanism, based on QM(DFT)/MM calculations, is compatible with thermally allowed concerted (but asynchronous) [π4s + π2s] mechanisms leading to the exclusive formation of racemic endo-cycloadducts...
October 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29147502/chemical-space-guided-discovery-of-antimicrobial-bridged-bicyclic-peptides-against-pseudomonas-aeruginosa-and-its-biofilms
#19
Ivan Di Bonaventura, Xian Jin, Ricardo Visini, Daniel Probst, Sacha Javor, Bee-Ha Gan, Gaëlle Michaud, Antonino Natalello, Silvia Maria Doglia, Thilo Köhler, Christian van Delden, Achim Stocker, Tamis Darbre, Jean-Louis Reymond
Herein we report the discovery of antimicrobial bridged bicyclic peptides (AMBPs) active against Pseudomonas aeruginosa, a highly problematic Gram negative bacterium in the hospital environment. Two of these AMBPs show strong biofilm inhibition and dispersal activity and enhance the activity of polymyxin, currently a last resort antibiotic against which resistance is emerging. To discover our AMBPs we used the concept of chemical space, which is well known in the area of small molecule drug discovery, to define a small number of test compounds for synthesis and experimental evaluation...
October 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29146939/optomechanical-terahertz-detection-with-single-meta-atom-resonator
#20
Cherif Belacel, Yanko Todorov, Stefano Barbieri, Djamal Gacemi, Ivan Favero, Carlo Sirtori
Most of the common technologies for detecting terahertz photons (>1 THz) at room temperature rely on slow thermal devices. The realization of fast and sensitive detectors in this frequency range is indeed a notoriously difficult task. Here we propose a novel device consisting of a subwavelength terahertz meta-atom resonator, which integrates a nanomechanical element and allows energy exchange between the mechanical motion and the electromagnetic degrees of freedom. An incident terahertz wave thus produces a nanomechanical signal that can be read out optically with high precision...
November 17, 2017: Nature Communications
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