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https://www.readbyqxmd.com/read/28454093/hsp90-inhibitor-17-dmag-exerts-anticancer-effects-against-gastric-cancer-cells-principally-by-altering-oxidant-antioxidant-balance
#1
Jeong Goo Kim, Sang Chul Lee, Ok-Hee Kim, Kee-Hwan Kim, Kyo Young Song, Sang Kuon Lee, Byung Jo Choi, Wonjun Jeong, Say-June Kim
Heat shock protein 90 (HSP90) stabilizes numerous oncoproteins and, therefore, its inhibition has emerged as a promising antineoplastic strategy for diverse malignancies. In this study, we determined the therapeutic effects and mechanisms of action of a specific HSP90 inhibitor, 17-dimethylamino-ethylamino-17-demethoxygeldanamycin (17-DMAG), in gastric cancer cell lines (AGS, SNU-1, and KATO-III), patient-derived tissues, and a mouse xenograft model. 17-DMAG exerted anticancer effects against gastric cancer cells, manifested by significantly decreased proliferation rates (P < 0...
April 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/28447936/ppp1r15a-mediated-dephosphorylation-of-eif2%C3%AE-is-unaffected-by-sephin1-or-guanabenz
#2
Ana Crespillo-Casado, Joseph E Chambers, Peter M Fischer, Stefan J Marciniak, David Ron
Dephosphorylation of translation initiation factor 2 (eIF2α) terminates signalling in the mammalian integrated stress response (ISR) and has emerged as a promising target for modifying the course of protein misfolding diseases. The [(o-chlorobenzylidene)amino]guanidines (Guanabenz and Sephin1) have been proposed to exert protective effects against misfolding by interfering with eIF2α-P dephosphorylation through selective disruption of a PP1-PPP1R15A holophosphatase complex. Surprisingly, they proved inert in vitro affecting neither stability of the PP1-PPP1R15A complex nor substrate-specific dephosphorylation...
April 27, 2017: ELife
https://www.readbyqxmd.com/read/28447371/cooperation-in-microbial-communities-and-their-biotechnological-applications
#3
REVIEW
Matteo Cavaliere, Song Feng, Orkun Soyer, Jose I Jimenez
Microbial communities are increasingly utilised in biotechnology. Efficiency and productivity in many of these applications depends on the presence of cooperative interactions between members of the community. Two key processes underlying these interactions are the production of public goods and metabolic crossfeeding, which can be understood in the general framework of ecological and evolutionary (eco-evo) dynamics. In this review we illustrate the relevance of cooperative interactions in microbial biotechnological processes, discuss their mechanistic origins, and analyse their evolutionary resilience...
April 26, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28446704/preservation-of-protein-expression-systems-at-elevated-temperatures-for-portable-therapeutic-production
#4
David K Karig, Seneca Bessling, Peter Thielen, Sherry Zhang, Joshua Wolfe
Many biotechnology capabilities are limited by stringent storage needs of reagents, largely prohibiting use outside of specialized laboratories. Focusing on a large class of protein-based biotechnology applications, we address this issue by developing a method for preserving cell-free protein expression systems for months above room temperature. Our approach realizes unprecedented long-term stability at elevated temperatures by leveraging the sugar alcohol trehalose, a simple, low-cost, open-air drying step, and strategic separation of reaction components during drying...
April 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28446485/primary-aortojejunal-fistula-a-rare-cause-for-massive-upper-gastrointestinal-bleeding
#5
Sylvester Paulasir, Rhami Khorfan, Christina Harsant, Harry Linne Anderson
A 68-year-old man presented to the emergency department with haematemesis and shock. Upper endoscopy and selective angiography could not identify the source of bleeding. He underwent selective embolisation of the gastroduodenal artery. The patient then had a period of about 24 hours with relative haemodynamic stability before having another episode of massive upper gastrointestinal bleed. A second attempt to embolise the common hepatic artery and distal coeliac axis was unsuccessful. Hence, he was urgently taken to the operating room for exploratory laparotomy...
April 26, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28444937/soluble-inorganic-nanoparticle-constructed-porous-coordination-frameworks-as-homogenized-heterogeneous-photocatalysts-for-suzuki-coupling-reaction-under-near-infrared-light
#6
Baodui Wang, Yuting Luo, Yong Peng, Weisheng Liu, Fengjuan Chen
Self-assembly has emerged as a promising method to control the structure and properties of ensembles of inorganic nanoparticles (NPs) for exploiting their collective effects. However, the rational assembly of inorganic NPs into soluble porous architectures as homogenized heterogeneous catalyst has been less studied. Here, we show that inorganic NPs can be used for the assembly of soluble porous coordination frameworks (PCFs) by atom-scale interfacial coordination-driven assembly strategy. Given large pore size, high dispersity in solution, strong absorption in the near-infrared range (NIR), and a long living electron-hole pair, the obtained soluble framework can serve as a platform for homogenize heterogeneous photocatalysts, which exhibited excellent activity, high apparent quantum efficiency, and recyclability to catalyze the noble metal free Suzuki coupling reaction under NIR light at room temperature...
April 26, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28444335/incidence-of-iga-vasculitis-in-children-estimated-by-four-source-capture-recapture-analysis-a-population-based-study
#7
Maryam Piram, Carla Maldini, Sandra Biscardi, Nathalie De Suremain, Christine Orzechowski, Emilie Georget, Delphine Regnard, Isabelle Koné-Paut, Alfred Mahr
Objectives.: The aim was to describe the epidemiological characteristics of childhood IgA vasculitis (IgAV) defined by the EULAR/PRINTO/Paediatric Rheumatology European Society criteria in a population-based sample from France and ascertain its incidence over 3 years by a four-source capture-recapture analysis. Methods.: Cases were prospectively collected in Val de Marne county, a suburb of Paris, with 263 874 residents <15 years old. Children with incident IgAV living in this area from 2012 to 2014 were identified by four sources of case notification (emergency departments, paediatrics departments, private-practice paediatricians and general practitioners)...
April 24, 2017: Rheumatology
https://www.readbyqxmd.com/read/28441372/assessing-response-of-high-grade-gliomas-to-immune-checkpoint-inhibitors
#8
Solmaz Sahebjam, Dexter G Stallworth, Sepideh Mokhtari, Nam D Tran, John A Arrington
BACKGROUND: Immunotherapeutic agents, especially checkpoint inhibitors, have emerged as the mainstay of therapy for several solid and hematological malignancies. These therapies are under investigation for the treatment of high-grade gliomas and brain metastases. METHODS: This article reviews the unique challenges encountered when evaluating changes on magnetic resonance imaging (MRI) of glioblastomas seen in response to immunotherapy and checkpoint inhibitors and how to effectively incorporate MRI findings into the response assessment of high-grade gliomas to these emerging therapies...
April 2017: Cancer Control: Journal of the Moffitt Cancer Center
https://www.readbyqxmd.com/read/28441014/chemistry-inspired-adaptable-framework-structures
#9
Zhiguo Xia, Kenneth R Poeppelmeier
Adaptable crystalline frameworks are important in modern solid-state chemistry as they are able to accommodate a wide range of elements, oxidation states, and stoichiometries. Owing to this ability, such adaptable framework structures are emerging as the prototypes for technologically important advanced functional materials. In this Account, the idea of cosubstitution is explored as a useful "pairing" concept that can potentially lead to the creation of many new members of one particular framework structure...
April 25, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28440091/microbial-exopolysaccharide-mediated-synthesis-and-stabilization-of-metal-nanoparticles
#10
Ganesan Sathiyanarayanan, Krishnamoorthy Dineshkumar, Yung-Hun Yang
Exopolysaccharides (EPSs) are structurally and functionally valuable biopolymer secreted by different prokaryotic and eukaryotic microorganisms in response to biotic/abiotic stresses and to survive in extreme environments. Microbial EPSs are fascinating in various industrial sectors due to their excellent material properties and less toxic, highly biodegradable, and biocompatible nature. Recently, microbial EPSs have been used as a potential template for the rapid synthesis of metallic nanoparticles and EPS-mediated metal reduction processes are emerging as simple, harmless, and environmentally benign green chemistry approaches...
April 25, 2017: Critical Reviews in Microbiology
https://www.readbyqxmd.com/read/28440058/atypical-inter-hemispheric-communication-correlates-with-altered-motor-inhibition-during-learning-of-a-new-bimanual-coordination-pattern-in-developmental-coordination-disorder
#11
Mélody Blais, David Amarantini, Jean-Michel Albaret, Yves Chaix, Jessica Tallet
Impairment of motor learning skills in developmental coordination disorder (DCD) has been reported in several studies. Some hypotheses on neural mechanisms of motor learning deficits in DCD have emerged but, to date, brain-imaging investigations are scarce. The aim of the present study is to assess possible changes in communication between brain areas during practice of a new bimanual coordination task in teenagers with DCD (n = 10) compared to matched controls (n = 10). Accuracy, stability and number of mirror movements were computed as behavioural variables...
April 25, 2017: Developmental Science
https://www.readbyqxmd.com/read/28438837/an-unpredicted-aggregation-critical-region-of-the-actin-polymerizing-protein-triobp-1-tara-determined-by-elucidation-of-its-domain-structure
#12
Nicholas J Bradshaw, Antony S K Yerabham, Rita Marreiros, Tao Zhang, Luitgard Nagel-Steger, Carsten Korth
Protein aggregation resulting from disruptions in proteostasis in the brains of patients with chronic mental illness is an emerging theme particularly in the study of schizophrenia. For example, proteins such as Disrupted in Schizophrenia 1 (DISC1) and dysbindin-1B are present in insoluble aggregates, detectable within brain homogenates from such patients. Using an epitope discovery and proteomics approach to compare post-mortem brain samples from schizophrenia patients and controls, we recently identified TRIO-Binding Protein 1 (TRIOBP-1, also known as Tara) as another aggregation-associated protein...
April 24, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28437918/modeling-and-designing-multilayer-2d-perovskite-silicon-bifacial-tandem-photovoltaics-for-high-efficiencies-and-long-term-stability
#13
Haejun Chung, Xingshu Sun, Aditya D Mohite, Rahul Singh, Lokendra Kumar, Muhammad A Alam, Peter Bermel
A key challenge in photovoltaics today is to develop cell technologies with both higher efficiencies and lower fabrication costs than incumbent crystalline silicon (c-Si) single-junction cells. While tandem cells have higher efficiencies than c-Si alone, it is generally challenging to find a low-cost, high-performance material to pair with c-Si. However, the recent emergence of 22% efficient perovskite photovoltaics has created a tremendous opportunity for high-performance, low-cost perovskite / crystalline silicon tandem photovoltaic cells...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437103/ion-pair-oligomerization-of-chromogenic-triangulenium-cations-with-cyanostar-modified-anions-that-controls-emission-in-hierarchical-materials
#14
Bo Qiao, Brandon E Hirsch, Semin Lee, Maren Pink, Chun-Hsing Chen, Bo W Laursen, Amar H Flood
The hierarchical assembly of colored cationic molecules with receptor-modified counteranions can be used to control optical properties in materials. However, our knowledge of when the optical properties emerge in the hierarchical organization and the variety of cation-anion salts that are available to create these materials is limited. In this work, we extend the salts from small halides to large inorganic anions and determine how the structure coevolves with the emission properties using solution assemblies...
April 24, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28436960/amyloid-fibril-systems-reduce-stabilize-and-deliver-bioavailable-nanosized-iron
#15
Yi Shen, Lidija Posavec, Sreenath Bolisetty, Florentine M Hilty, Gustav Nyström, Joachim Kohlbrecher, Monika Hilbe, Antonella Rossi, Jeannine Baumgartner, Michael B Zimmermann, Raffaele Mezzenga
Iron-deficiency anaemia (IDA) is a major global public health problem. A sustainable and cost-effective strategy to reduce IDA is iron fortification of foods, but the most bioavailable fortificants cause adverse organoleptic changes in foods. Iron nanoparticles are a promising solution in food matrices, although their tendency to oxidize and rapidly aggregate in solution severely limits their use in fortification. Amyloid fibrils are protein aggregates initially known for their association with neurodegenerative disorders, but recently described in the context of biological functions in living organisms and emerging as unique biomaterial building blocks...
April 24, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28435954/electrostatically-stabilized-hybrids-of-carbon-and-maghemite-nanoparticles-electrochemical-study-and-application
#16
D Baratella, M Magro, P Jakubec, E Bonaiuto, J de Almeida Roger, E Gerotto, G Zoppellaro, J Tucek, K C Safarova, R Zbořil, A Cecconello, I Willner, S Santagata, P Sambo, F Vianello
Binary hybrids have been investigated for the past few decades due to the emerging properties of nanoparticle composites. Electrostatically stabilized core-shell nanostructures composed of surface active magnetic nanoparticles (SAMNs) and differently charged carbon nanomaterials display specific electrochemical properties. In this work, a set of binary hybrids that include a new class of magnetic nanoparticles is presented and the electrochemical features of the hybrids are reported. Gallic acid derived carbon dots (GA-CDs), PEG derived graphene dots (PEG-GDs), and quaternized carbon dots (Q-CDs) characterized by different charged groups were used for the preparation of different complexes with SAMNs...
April 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28435892/dramatic-improvement-of-crispr-cas9-editing-in-candida-albicans-by-increased-single-guide-rna-expression
#17
Henry Ng, Neta Dean
The clustered regularly interspaced short palindromic repeat system with CRISPR-associated protein 9 nuclease (CRISPR/Cas9) has emerged as a versatile tool for genome editing in Candida albicans. Mounting evidence from other model systems suggests that the intracellular levels of single guide RNA (sgRNA) limit the efficiency of Cas9-dependent DNA cleavage. Here, we tested this idea and describe a new means of sgRNA delivery that improves previously described methods by ~10-fold. The efficiency of Cas9/sgRNA-dependent cleavage and repair of a single-copy yeast enhanced monomeric red fluorescent protein (RFP) gene was measured as a function of various parameters that are hypothesized to affect sgRNA accumulation, including transcriptional and posttranscriptional processing...
March 2017: MSphere
https://www.readbyqxmd.com/read/28435878/evolutionary-dynamics-of-crispr-gene-drives
#18
Charleston Noble, Jason Olejarz, Kevin M Esvelt, George M Church, Martin A Nowak
The alteration of wild populations has been discussed as a solution to a number of humanity's most pressing ecological and public health concerns. Enabled by the recent revolution in genome editing, clustered regularly interspaced short palindromic repeats (CRISPR) gene drives-selfish genetic elements that can spread through populations even if they confer no advantage to their host organism-are rapidly emerging as the most promising approach. However, before real-world applications are considered, it is imperative to develop a clear understanding of the outcomes of drive release in nature...
April 2017: Science Advances
https://www.readbyqxmd.com/read/28434789/conversion-of-biomass-to-hydroxymethylfurfural-a-review-of-catalytic-systems-and-underlying-mechanisms
#19
REVIEW
Iris K M Yu, Daniel C W Tsang
Conversion of biomass waste to hydroxymethylfurfural (HMF), a value-added platform chemical, has captured great research interests driven by the economic and environmental incentives. This review evaluates the recent development of biomass conversion systems for high HMF yield and selectivity, with a focus on the performance of emerging catalysts and solvents from a mechanistic view. We highlight that the ratio and strength of Brønsted and Lewis acid in bifunctional catalyst are critical for maximizing HMF production by selective improvement in the kinetics of desirable reactions (hydrolysis, isomerization, and dehydration) over undesirable reactions (rehydration, polymerization)...
April 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28433953/the-ability-of-early-serial-developmental-assessment-to-predict-outcome-at-5years-following-neonatal-hypoxic-ischaemic-encephalopathy
#20
Catherine M O'Connor, C Anthony Ryan, Geraldine B Boylan, Deirdre M Murray
BACKGROUND: Neurodevelopmental difficulties in children following hypoxic-ischaemic encephalopathy (HIE) may not emerge until school age. AIMS: To evaluate the value and stability of early serial developmental assessments in predicting long-term outcome. STUDY DESIGN: Prospective study of infants with neonatal HIE and early continuous EEG at birth. SUBJECTS: Term infants with HIE were recruited at birth. Development was measured at 6, 12 and 24months using the Revised Griffiths' Scales (GMDS-R)...
April 20, 2017: Early Human Development
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