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https://www.readbyqxmd.com/read/28549345/a-novel-synthetic-derivative-of-quercetin-8-trifluoromethyl-3-5-7-3-4-o-pentamethyl-quercetin-inhibits-bladder-cancer-growth-by-targeting-the-ampk-mtor-signaling-pathway
#1
Ting Tao, Caimei He, Jun Deng, Yanjun Huang, Qiongli Su, Mei Peng, Meiling Yi, Kwame Oteng Darko, Hui Zou, Xiaoping Yang
Quercetin is a naturally existing compound and shows attractive anticancer properties for a variety of solid tumors including glioma, bladder cancer, hepatocellular carcinoma, breast cancer, hematological malignancies and prostate carcinoma. However, these anticancer properties have not been clinically approved due to unclear mechanistic information and its low bioactivity. In our previous study, we elucidated that quercetin activates AMPK pathway which is the major mechanism for its unique anticancer effect in bladder cancer...
May 11, 2017: Oncotarget
https://www.readbyqxmd.com/read/28549316/method-for-assessment-of-stormwater-treatment-facilities-synthetic-road-runoff-addition-including-micro-pollutants-and-tracer
#2
Karin Cederkvist, Marina B Jensen, Peter E Holm
Stormwater treatment facilities (STFs) are becoming increasingly widespread but knowledge on their performance is limited. This is due to difficulties in obtaining representative samples during storm events and documenting removal of the broad range of contaminants found in stormwater runoff. This paper presents a method to evaluate STFs by addition of synthetic runoff with representative concentrations of contaminant species, including the use of tracer for correction of removal rates for losses not caused by the STF...
May 23, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28549294/chiral-recognition-of-naproxen-enantiomers-based-on-fluorescence-quenching-of-bovine-serum-albumin-stabilized-gold-nanoclusters
#3
Marzieh Jafari, Javad Tashkhourian, Ghodratollah Absalan
A simple, fast and green method for chiral recognition of S- and R-naproxen has been introduced. The method was based on quenching of the fluorescence intensity of bovine serum albumin-stabilized gold nanoclusters in the presence of naproxen enantiomers. The quenching intensity in the presence of S-naproxen was higher than R-naproxen when phosphate buffer solution at pH7.0 was used. The chiral recognition occurred due to steric effect between bovine serum albumin conformation and naproxen enantiomers. Two linear determination range were established as 7...
May 16, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28549242/identification-of-related-substances-in-tofacitinib-citrate-by-lc-ms-techniques-for-synthetic-process-optimization
#4
Xiao Wu, Xuefang Zeng, Lei Wang, Taijun Hang, Min Song
A specific LC-MS method was developed for separation, identification and characterization of the process-related substances and degradation products in tofacitinib citrate. The separation was achieved on a LiChrospher C18 column (250mm×4.6mm, 5μm) by linear gradient elution of 0.1% ammonium acetate solution (pH adjusted to 4.0 by formic acid) and acetonitrile at a flow rate of 1.0mL/min. Forced degradation studies were conducted under hydrolytic (acidic, basic), oxidative, photolytic and thermal stress conditions as described in ICH...
May 13, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28549232/identification-and-characterization-of-transcription-factor-zmereb94-involved-in-starch-synthesis-in-maize
#5
Hui Li, Qianlin Xiao, Chunxia Zhang, Jia Du, Xiao Li, Huanhuan Huang, Bin Wei, Yangping Li, Guowu Yu, Hanmei Liu, Yufeng Hu, Yinghong Liu, Junjie Zhang, Yubi Huang
Maize is an important food crop and industrial material owing to its high starch content. However, the mechanism of starch synthesis is not fully elucidated, especially with regard to the expression and regulation of starch synthetic genes. The APETALA2/Ethylene Responsive Factor (AP2/ERF) family plays a crucial role in various biological processes via regulating gene expression. In this study, the ZmEREB94 gene was identified through co-expression analysis. Bioinformatics analysis confirmed that ZmEREB94 belongs to the AP2/ERF family...
May 4, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28548902/er-mitochondria-signaling-regulates-autophagy
#6
Patricia Gomez-Suaga, Sebastien Paillusson, Christopher C J Miller
The endoplasmic reticulum (ER) and mitochondria form tight functional contacts that regulate a number of key cellular processes. The formation of these contacts involves "tethering proteins" that function to recruit regions of ER to mitochondria. The integral ER protein VAPB (VAMP associated protein B and C) binds to the outer mitochondrial membrane protein, RMDN3/PTPIP51 (regulator of microtubule dynamics 3) to form one such set of tethers. Recently, we showed that the VAPB-RMDN3 tethers regulate macroautophagy/autophagy...
May 26, 2017: Autophagy
https://www.readbyqxmd.com/read/28548863/visible-light-promoted-synthesis-of-indoles-by-single-photosensitizer-under-aerobic-conditions
#7
Wen-Qiang Liu, Tao Lei, Zi-Qi Song, Xiu-Long Yang, Cheng-Juan Wu, Xin Jiang, Bin Chen, Chen-Ho Tung, Li-Zhu Wu
The construction of substituted indole skeletons is always an important concern of synthetic chemists because of its prevalent structure found in natural products and biological molecules. Here, we succeeded in preparing indoles and their derivatives from a wide variety of simple enamines via radical cyclization only with catalytic amounts of an iridium(III) photosensitizer (PS) in DMSO solution under air atmosphere. The mechanistic investigation suggests that the reaction involves a radical course to accomplish the conversion of enamines to indoles under visible light irradiation...
May 26, 2017: Organic Letters
https://www.readbyqxmd.com/read/28548838/synthesis-of-defined-and-functionalized-glycans-of-lipoteichoic-acid-a-cell-surface-polysaccharide-from-clostridium-difficile
#8
Kang Yu, Ningning Bi, Chenghe Xiong, Shuihong Cai, Zhongzhu Long, Zhongwu Guo, Guofeng Gu
Two structurally defined, functionalized glycans of lipoteichoic acid (LTA, also known as PS-III) from C. difficile, which have one or two repeating units of LTA linked to the core trisaccharide, were efficiently synthesized via a convergent [2 + 3] or [2 + 2 + 3] strategy. The α-linkage of both N-acetylglucosamine residues in the repeating unit were constructed with glycosyl imidates of azidosugars as donors, while the phosphodiester bridges between the oligosaccharides were fashioned using H-phosphonate chemistry...
May 26, 2017: Organic Letters
https://www.readbyqxmd.com/read/28548677/destabilization-of-human-insulin-fibrils-by-peptides-of-fruit-bromelain-derived-from-ananas-comosus-pineapple
#9
Sromona Das, Debasish Bhattacharyya
Deposition of insulin aggregates in human body leads to dysfunctioning of several organs. Effectiveness of fruit bromelain from pineapple in prevention of insulin aggregate was investigated. Proteolyses of bromelain was done as par human digestive system and the pool of small peptides was separated from larger peptides and proteins. Under conditions of growth of insulin aggregates from its monomers, this pool of peptides restricted the reaction upto formation of oligomers of limited size. These peptides also destabilized preformed insulin aggregates to oligomers...
May 26, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28548530/strain-induced-gauge-field-and-landau-levels-in-acoustic-structures
#10
Zhaoju Yang, Fei Gao, Yahui Yang, Baile Zhang
The emerging field of topological acoustics that explores novel gauge-field-related phenomena for sound has drawn attention in recent years. However, previous approaches constructing a synthetic gauge field for sound predominantly relied on a periodic system, being unable to form a uniform effective magnetic field, thus lacking access to some typical magnetic-induced quantum phenomena such as Landau energy quantization. Here we introduce strain engineering, previously developed in graphene electronics and later transferred to photonics, into a two-dimensional acoustic structure in order to form a uniform effective magnetic field for airborne acoustic wave propagation...
May 12, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28548488/a-fluorescent-split-aptamer-for-visualizing-rna-rna-assembly-in-vivo
#11
Khalid K Alam, Kwaku D Tawiah, Matthew F Lichte, David Porciani, Donald H Burke
RNA-RNA assembly governs key biological processes and is a powerful tool for engineering synthetic genetic circuits. Characterizing RNA assembly in living cells often involves monitoring fluorescent reporter proteins, which are at best indirect measures of underlying RNA-RNA hybridization events and are subject to additional temporal and load constraints associated with translation and activation of reporter proteins. In contrast, RNA aptamers that sequester small molecule dyes and activate their fluorescence are increasingly utilized in genetically encoded strategies to report on RNA-level events...
May 26, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28548485/clinically-relevant-detection-of-streptococcus-pneumoniae-with-dna-antibody-nanostructures
#12
Jinping Wang, May Ching Leong, Eric Zhewei Leong, Win Sen Kuan, David T Leong
Streptococcus pneumoniae (SP) is a pathogenic bacterium and a major cause of community-acquired pneumonia that could be fatal if left untreated. Therefore, rapid and sensitive detection of SP is crucial to enable targeted treatment during SP infections. In this study, DNA tetrahedron (DNA TH) with a hollow structure is anchored on gold electrodes to construct an electrochemical immunosensor for rapid detection of pneumococcal surface protein A (PspA) peptide and SP lysate from synthetic and actual human samples...
May 26, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28548452/insulin-a-persistent-synthetic-challenge
#13
Luis Moroder, Hans-Jürgen Musiol
After a short historical overview from the discovery to production of insulin from animal sources, later via semi-synthesis and finally rDNA-based expression, the review focuses on the most recent advances of chemical synthesis that progressively sur-mounted all technical obstacles of assembling heterodimeric structures crosslinked by intra- and intermolecular disulfides via biomimetic insulin precursors in the search for analogues of improved therapeutic properties.
May 26, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28548370/current-state-of-a-dual-behavior-of-antimicrobial-peptides-therapeutic-agents-and-promising-delivery-vectors
#14
REVIEW
Urszula Piotrowska, Marcin Sobczak, Ewa Oledzka
Microorganism resistance is an important challenge in modern medicine due to the global uncontrolled use of antibiotics. Natural and synthetic antimicrobial peptides (AMPs) symbolize a new family of antibiotics, which have stimulated research and clinical interest as new therapeutic options for infections. They represent one of the most promising antimicrobial substances, due to their broad spectrum of biological activity, against bacteria, fungi, protozoa, viruses, yeast and even tumour cells. Besides, being antimicrobial, AMPs have been shown to bind and neutralize bacterial endotoxins, as well as possess immunomodulatory, anti-inflammatory, wound-healing, angiogenic and antitumour properties...
May 26, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28548159/synthesis-of-tetrafluoroethylene-and-tetrafluoroethyl-containing-azides-and-their-1-3-dipolar-cycloaddition-as-synthetic-application
#15
Svatava Voltrová, Mickaël Muselli, Josef Filgas, Václav Matoušek, Blanka Klepetářová, Petr Beier
Tetrafluoroethylene-containing azides are accessed in two steps (one pot) from tetrafluoroalkyl bromides by metalation and reaction with electrophilic azides. Subsequent copper(i)-catalyzed azide-alkyne cycloaddition afforded N-tetrafluoroethyl and N-tetrafluoroethylene 4-substituted 1,2,3-triazoles. In addition, the protocol for the synthesis of 4,5-disubstituted 1,2,3-triazoles is presented.
May 26, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28548098/rationally-designed-mineralization-for-selective-recovery-of-the-rare-earth-elements
#16
Takaaki Hatanaka, Akimasa Matsugami, Takamasa Nonaka, Hideki Takagi, Fumiaki Hayashi, Takao Tani, Nobuhiro Ishida
The increasing demand for rare earth (RE) elements in advanced materials for permanent magnets, rechargeable batteries, catalysts and lamp phosphors necessitates environmentally friendly approaches for their recovery and separation. Here, we propose a mineralization concept for direct extraction of RE ions with Lamp (lanthanide ion mineralization peptide). In aqueous solution containing various metal ions, Lamp promotes the generation of RE hydroxide species with which it binds to form hydrophobic complexes that accumulate spontaneously as insoluble precipitates, even under physiological conditions (pH ∼6...
May 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28547924/effect-of-a-thin-customized-insole-on-pain-and-walking-ability-in-rheumatoid-arthritis-a-randomized-study
#17
Berit Hagemoen Linberg, Anne Marit Mengshoel
OBJECTIVE: The aim of the study was to investigate the immediate effects of a thin, easily customizable insole on pain and walking ability in patients with rheumatoid arthritis (RA) who have forefoot pain, and to determine whether the insoles were in use 1 year afterwards. DESIGN: An experimental, assessor-blinded design was applied to compare the immediate effects when walking with or without insoles in random order. After 1 year, a structured telephone interview was conducted...
May 25, 2017: Musculoskeletal Care
https://www.readbyqxmd.com/read/28547877/comparative-study-of-osteogenic-activity-of-multilayers-made-of-synthetic-and-biogenic-polyelectrolytes
#18
Deepak Guduru, Marcus S Niepel, Cristina Gonzalez-Garcia, Manuel Salmeron-Sanchez, Thomas Groth
Polyelectrolyte multilayer (PEM) coatings on biomaterials are applied to tailor adhesion, growth, and function of cells on biomedical implants. Here, biogenic and synthetic polyelectrolytes (PEL) are used for layer-by-layer assembly to study the osteogenic activity of PEM with human osteosarcoma MG-63 cells in a comparative manner. Formation of PEM is achieved with biogenic PEL fibrinogen (FBG) and poly-l-lysine (PLL) as well as biotinylated chondroitin sulfate (BCS) and avidin (AVI), while poly(allylamine hydrochloride) (PAH) and polystyrene sulfonate (PSS) represent a fully synthetic PEM used as a reference system here...
May 26, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28547767/wet-chemical-synthesis-of-hollow-red-phosphorus-nanospheres-with-porous-shells-as-anodes-for-high-performance-lithium-ion-and-sodium-ion-batteries
#19
Jianbin Zhou, Xianyu Liu, Wenlong Cai, Yongchun Zhu, Jianwen Liang, Kailong Zhang, Yang Lan, Zhuoheng Jiang, Gongming Wang, Yitai Qian
Large-volume-expansion-induced material pulverization severely limits the electrochemical performance of red phosphorous (P) for energy-storage applications. Hollow nanospheres with porous shells are recognized as an ideal structure to resolve these issues. However, a chemical synthetic approach for preparing nanostructured red P is always of great challenge and hollow nanosphere structures of red P have not yet been fabricated. Herein, a wet solvothermal method to successfully fabricate hollow P nanospheres (HPNs) with porous shells via a gas-bubble-directed formation mechanism is developed...
May 26, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28547573/results-of-lumbar-spondylodeses-using-different-bone-grafting-materials-after-transforaminal-lumbar-interbody-fusion-tlif
#20
Nicolas Heinz vonderHoeh, Anna Voelker, Christoph-Eckhard Heyde
PURPOSE: Can a mixture of hydroxyapatite (HA) and autologous bone from decompression sites produce similar results when used for transforaminal lumbar interbody fusion (TLIF)? In the current literature, autologous iliac crest bone grafts (ICBGs) have been reported the gold standard for this procedure. Indeed, to date, no clinical data have confirmed that a mixture of equal volumes of HA and local autologous bone produce similar results in term of fusion as the same volume of autologous ICBG alone...
May 25, 2017: European Spine Journal
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