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Tamanna Jahan Mony, Jae Won Lee, Cheryl Dreyfus, Emanuel DiCicco-Bloom, Hee Jae Lee
Objective: We reported that postnatal exposure of rats to valproic acid (VPA) stimulated proliferation of glial precursors during cortical gliogenesis. However, there are no reports whether enhanced postnatal gliogenesis affects behaviors related to neuropsychiatric disorders. Methods: After VPA treatment during the postnatal day (PND) 2 to PND 4, four behavioral test, such as open field locomotor test, elevated plus maze test, three-chamber social interaction test, and passive avoidance test, were performed at PND 21 or 22...
November 30, 2016: Clinical Psychopharmacology and Neuroscience: the Official Scientific Journal of the Korean College of Neuropsychopharmacology
Joël Doussot, Véronique Mathieu, Cyril Colas, Roland Molinié, Cyrielle Corbin, Josiane Montguillon, Laeticia Moreno Y Banuls, Sullivan Renouard, Frédéric Lamblin, Patricia Dupré, Benoit Maunit, Robert Kiss, Christophe Hano, Eric Lainé
Podophyllotoxin, a lignan still extracted from the rhizomes of Podophyllum hexandrum (Berberidaceae), is the starting molecule for the semisynthesis of widely used anticancer drugs such as etoposide. However, this source is threatened by the over-collection of P. hexandrum. Plants belonging to the Linaceae and Cupressaceae families could be attractive alternative sources with species that contain the lignan podophyllotoxin or its precursors and derivatives. Wild flax species, such as Linum flavum, as well as some Juniperus and Callitris species were investigated for their lignan content, and the in vitro antiproliferative capacity of their extracts was assayed on four tumor cell lines...
October 24, 2016: Planta Medica
Jian Wang, Radovan Krejci, Scott Giangrande, Chongai Kuang, Henrique M J Barbosa, Joel Brito, Samara Carbone, Xuguang Chi, Jennifer Comstock, Florian Ditas, Jost Lavric, Hanna E Manninen, Fan Mei, Daniel Moran-Zuloaga, Christopher Pöhlker, Mira L Pöhlker, Jorge Saturno, Beat Schmid, Rodrigo A F Souza, Stephen R Springston, Jason M Tomlinson, Tami Toto, David Walter, Daniela Wimmer, James N Smith, Markku Kulmala, Luiz A T Machado, Paulo Artaxo, Meinrat O Andreae, Tuukka Petäjä, Scot T Martin
The nucleation of atmospheric vapours is an important source of new aerosol particles that can subsequently grow to form cloud condensation nuclei in the atmosphere. Most field studies of atmospheric aerosols over continents are influenced by atmospheric vapours of anthropogenic origin (for example, ref. 2) and, in consequence, aerosol processes in pristine, terrestrial environments remain poorly understood. The Amazon rainforest is one of the few continental regions where aerosol particles and their precursors can be studied under near-natural conditions, but the origin of small aerosol particles that grow into cloud condensation nuclei in the Amazon boundary layer remains unclear...
October 24, 2016: Nature
Simon T Thompson, H Henry Lamb, Bernard Delley, Stefan Franzen
Tetraamminepalladium(II) perrhenate, a double complex salt, has significant utility in PdRe catalyst preparation; however, the vibrational spectra of this readily prepared compound have not been described in the literature. Herein, we present the infrared (IR) and Raman spectra of tetraamminepalladium(II) perrhenate and several related compounds. The experimental spectra are complemented by an analysis of normal vibrational modes that compares the experimentally obtained spectra with spectra calculated using DFT (DMol(3))...
October 17, 2016: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Clare F Megarity, Julian Esselborn, Suzannah V Hexter, Florian Wittkamp, Ulf-Peter Apfel, Thomas Happe, Fraser A Armstrong
Protein film electrochemistry (PFE) has been used to study the assembly of the complex 6Fe active site of [FeFe]-hydrogenases (known as the H-cluster) from its precursors the [4Fe 4S] domain that is already coordinated within the host and the 2Fe domain that is presented as a synthetic water-soluble complex stabilized by an additional CO. Not only does PFE allow control of redox states via the electrode potential, but the immobilized state of the enzyme facilitates control of extremely low concentrations of the 2Fe complex...
October 24, 2016: Journal of the American Chemical Society
Joshua H K Tam, M Rebecca Cobb, Claudia Seah, Stephen H Pasternak
The amyloid hypothesis posits that the production of β-amyloid (Aβ) aggregates leads to neurodegeneration and cognitive decline associated with AD. Aβ is produced by sequential cleavage of the amyloid precursor protein (APP) by β- and γ-secretase. While nascent APP is well known to transit to the endosomal/ lysosomal system via the cell surface, we have recently shown that APP can also traffic to lysosomes intracellularly via its interaction with AP-3. Because AP-3 interacts with cargo protein via interaction with tyrosine motifs, we mutated the three tyrosines motif in the cytoplasmic tail of APP...
2016: PloS One
Wonchul Cho, Hye Jin Kim, Hae In Lee, Myung Won Seo, Ho Won Ra, Sang Jun Yoon, Tae-Young Mun, Yong Ku Kim, Jae Ho Kim, Bo Hwa Kim, Jin Woo Kook, Chung-Yul Yoo, Jae Goo Lee, Jang Wook Choi
Nanostructured silicon (Si) is useful in many applications, and has typically been synthesized by bottom-up colloid-based solution processes or top-down gas phase reactions at high temperatures. These methods, however, suffer from toxic precursors, low yields, and impractical processing conditions (i.e., high pressure). The magnesiothermic reduction of silicon oxide (SiO2) has also been introduced as an alternative method. Here, we demonstrate the reduction of SiO2 by a simple milling process using a lab-scale planetary-ball mill and industry-scale attrition-mill...
October 24, 2016: Nano Letters
D F Paulo, A M L Azeredo-Espin, L E C Canesin, R Vicentini, A C M Junqueira
MicroRNAs (miRNAs) are small noncoding RNAs that modulate gene expression through post-transcriptional regulation. Here, we report the identification and characterization of miRNAs in two closely related screwworm flies with different feeding habits: Cochliomyia hominivorax and Cochliomyia macellaria. The New World screwworm, C. hominivorax, is an obligatory parasite of warm-blooded vertebrates, whereas the secondary screwworm, C. macellaria, is a free-living organism that feeds on decaying organic matter. Here, the small RNA transcriptomes of adults and third-instar larvae of both species were sequenced...
October 24, 2016: Insect Molecular Biology
R-H Xu, B Liu, J-D Wu, Y-Y Yan, J-N Wang
OBJECTIVE: Atherosclerosis is recognized as a chronic inflammatory disease leading to hardening of the vessel wall and narrowing of arteries. Endothelial cells (ECs) exhibit highly active glycolysis, the dysfunction of which leads to accumulation of lipids in the arterial wall and formation of atherosclerotic plaque. MATERIALS AND METHODS: qRT-PCR was performed to compare the deregulated miR-143 between atherosclerotic plaque and normal vessel tissues. The direct target of miR-143 was verified by Western blot and luciferase assay...
October 2016: European Review for Medical and Pharmacological Sciences
I C Haznedaroglu, U Y Malkan
The existence of a local renin-angiotensin system (RAS) specific to the hematopoietic bone marrow (BM) microenvironment had been proposed two decades ago. Most of the RAS molecules including ACE, ACE2, AGT, AGTR1, AGTR2, AKR1C4, AKR1D1, ANPEP, ATP6AP2, CMA1, CPA3, CTSA, CTSD, CTSG, CYP11A1, CYP11B1, CYP11B2, CYP17A1, CYP21A2, DPP3, EGFR, ENPEP, GPER, HSD11B1, HSD11B2, IGF2R, KLK1, LNPEP, MAS1, MME, NR3C1, NR3C2, PREP, REN, RNPEP, and THOP1 are locally present in the BM microenvironment. Local BM RAS peptides control the hematopoietic niche, myelopoiesis, erythropoiesis, thrombopoiesis and the development of other cellular lineages...
October 2016: European Review for Medical and Pharmacological Sciences
Sandra Goebbels, Georg L Wieser, Alexander Pieper, Sonia Spitzer, Bettina Weege, Kuo Yan, Julia M Edgar, Oleksandr Yagensky, Sven P Wichert, Amit Agarwal, Khalad Karram, Nicolas Renier, Marc Tessier-Lavigne, Moritz J Rossner, Ragnhildur Thóra Káradóttir, Klaus-Armin Nave
The molecular trigger of CNS myelination is unknown. By targeting Pten in cerebellar granule cells and activating the AKT1-mTOR pathway, we increased the caliber of normally unmyelinated axons and the expression of numerous genes encoding regulatory proteins. This led to the expansion of genetically wild-type oligodendrocyte progenitor cells, oligodendrocyte differentiation and de novo myelination of parallel fibers. Thus, a neuronal program dependent on the phosphoinositide PI(3,4,5)P3 is sufficient to trigger all steps of myelination...
October 24, 2016: Nature Neuroscience
Famke Aeffner, Nathan T Martin, Mirza Peljto, Joshua C Black, Justin K Major, Maryam Jangani, Michael O Ports, Joseph S Krueger, G David Young
Tissue image analysis (tIA) is emerging as a powerful tool for quantifying biomarker expression and distribution in complex diseases and tissues. Pancreatic ductal adenocarcinoma (PDAC) develops in a highly complex and heterogeneous tissue environment and, generally, has a very poor prognosis. Early detection of PDAC is confounded by limited knowledge of the pre-neoplastic disease stages and limited methods to quantitatively assess disease heterogeneity. We sought to develop a tIA approach to assess the most common PDAC precursor lesions, pancreatic intraepithelial neoplasia (PanIN), in tissues from Kras(LSL-G12D/+); Trp53(LSL-R172H/+); Pdx-Cre (KPC) mice, a validated model of PDAC development...
October 24, 2016: Laboratory Investigation; a Journal of Technical Methods and Pathology
Toshiyuki Yamaji, Aya Horie, Yuriko Tachida, Chisato Sakuma, Yusuke Suzuki, Yasunori Kushi, Kentaro Hanada
Ceramide is a common precursor of sphingomyelin (SM) and glycosphingolipids (GSLs) in mammalian cells. Ceramide synthase 2 (CERS2), one of the six ceramide synthase isoforms, is responsible for the synthesis of very long chain fatty acid (C20-26 fatty acids) (VLC)-containing ceramides (VLC-Cer). It is known that the proportion of VLC species in GSLs is higher than that in SM. To address the mechanism of the VLC-preference of GSLs, we used genome editing to establish three HeLa cell mutants that expressed different amounts of CERS2 and compared the acyl chain lengths of SM and GSLs by metabolic labeling experiments...
October 21, 2016: International Journal of Molecular Sciences
Bhuvnesh Bharti, David Rutkowski, Koohee Han, Aakash Umesh Kumar, Carol K Hall, Orlin D Velev
Janus and patchy particles are emerging as models for studying complex directed assembly patterns and as precursors of new structured materials and composites. Here we show how lipid induced capillary bridging could serve as a new and non conventional method of assembling patchy particles into ordered structures. Iron oxide surface patches on latex microspheres were selectively wetted with liquid lipids, driving the particle assembly into 2D and 3D clusters via interparticle capillary bridge formation. The liquid phase of the bridges allows local reorganization of the particles within the clusters and assists in forming true equilibrium configurations...
October 24, 2016: Journal of the American Chemical Society
Suzanne Faxneld, Urs Berger, Björn Helander, Sara Danielsson, Anna Aroha Miller, Elisabeth Nyberg, Jan-Olov Persson, Anders Bignert
Temporal and spatial trends of perfluoroalkyl acids (PFAAs) were investigated in Baltic Sea herring liver (Clupea harengus) from three sites, and white-tailed sea eagle (WTSE) eggs (Haliaeetus albicilla) from two freshwater and two marine areas in Sweden. Trends of most quantifiable PFAAs increased over the monitored period (1980 - 2014 in herring, 1960s/1980s - 2010 in WTSE). No significant decreasing trends were observed for the most recent ten years for any substances, except perfluorooctane sulfonamide (FOSA)...
October 24, 2016: Environmental Science & Technology
Maura Marinozzi, Fabrizio Pertusati, Michaela Serpi
The compounds characterized by the presence of a λ(5)-phosphorus functionality at the α-position with respect to the diazo moiety, here referred to as λ(5)-phosphorus-containing α-diazo compounds (PCDCs), represent a vast class of extremely versatile reagents in organic chemistry and are particularly useful in the preparation of phosphonate- and phosphinoxide-functionalized molecules. Indeed, thanks to the high reactivity of the diazo moiety, PCDCs can be induced to undergo a wide variety of chemical transformations...
October 24, 2016: Chemical Reviews
Jens Langer, Irina Kosygin, Ralph Puchta, Jürgen Pahl, Sjoerd Harder
Simple strategies to obtain magnesium complexes with the soft chelating diylidic ligand [Ph2 PCHPPh2 (fluorenylidene)](-) (dppmflu(-) ) were developed to evaluate the influence of the hard acid (cation) and soft base (anion) mismatch on the stability and reactivity of the formed derivatives. Deprotonation of the precursor Ph2 PCH2 PPh2 (flu) (dppmfluH) by an alkylmagnesium derivative or magnesium amide provided access to [{Mg(dppmflu)(μ-nBu)}2 ], [Mg(dppmflu){N(SiMe3 )2 }], and [{Mg(dppmflu)(μ-Me)}2 ], which were used as starting materials for further investigations...
October 24, 2016: Chemistry: a European Journal
Bharathkumar Inturi, Gurubasavaraj V Pujar, Madhusudhan N Purohit
Mycobacterium tuberculosis enoyl-ACP reductase (InhA) has been validated as a promising target for antitubercular agents. Isoniazid (INH), the most prescribed drug to treat tuberculosis (TB), inhibits a NADH-dependent InhA that provides precursors of mycolic acids, which are components of the mycobacterial cell wall. It is a pro-drug that needs activation to form the inhibitory INH-NAD adduct by KatG coding for catalase-peroxidase. The INH resistance of M. tuberculosis is caused by mutations in KatG, which may lead to multidrug-resistant TB (MDR-TB)...
October 24, 2016: Archiv der Pharmazie
Thomas C Wilson, Greg McSweeney, Sean Preshlock, Stefan Verhoog, Matthew Tredwell, Thomas Cailly, Véronique Gouverneur
A general method for the copper mediated nucleophilic (123)I-iodination of (hetero)aryl boronic esters and acids has been developed. The broad substrate scope of this radiosynthetic approach allows access to [(123)I]DPA-713, [(123)I]IMPY, [(123)I]MIBG and [(123)I]IPEB that are four commonly used SPECT radiotracers. Our results infer that aryl boronic reagents can now be employed as common precursors for both fluorine-18 and iodine-123 radiolabelling.
October 24, 2016: Chemical Communications: Chem Comm
Cong Wang, Yibo Gao, Xinghua Gao, Hua Wang, Jingxuan Tian, Li Wang, Bingpu Zhou, Ziran Ye, Jun Wan, Weijia Wen
A highly efficient photochromic hydrogel was successfully fabricated via casting precursor, which is based on amorphous tungsten oxide and poly (ethylene oxide)-block-poly (propylene oxide)-block-poly (ethylene oxide). Under simulated solar illumination, the hydrogel has a rapid and controlled temperature increasing ratio as its coloration degree. Localized electrons in the amorphous tungsten oxide play a vital role in absorption over a broad range of wavelengths from 400 nm to 1100 nm, encompassing the entire visible light and infrared regions in the solar spectrum...
October 24, 2016: Scientific Reports
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