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https://www.readbyqxmd.com/read/28823089/study-of-photophysical-properties-on-newly-synthesized-coumarin-derivatives
#1
Ashok H Sidarai, Vani R Desai, Shirajahammad M Hunagund, Mahantesha Basanagouda, Jagadish S Kadadevarmath
Herein, we have studied the photophysical properties for three newly synthesized coumarin derivatives; 4-((2,6-dibromo-4-methylphenoxy)methyl)-2H-benzo[h]chromen-2-one (DMB), 4-((3,4-dihydro-6,7-dimethoxyisoquinolin-1-yl)methyl)-6-methyl-2H-chromen-2-one (DIM) and 4-((p-tolyloxy)methyl)-6-methoxy-2H-chromen-2-one (TMC). The absorption and emission spectra for above said molecules were recorded in different solvents at room temperature in order to calculate their ground and excited state dipole moments. The ground (μ g ) and excited state dipole (μ e ) moments of these coumarin derivatives were calculated using Lippert's, Bakshiev's and Kawski-Chamma-Viallet's equations by the solvatochromic shift method, which involves a variation of Stokes shift with the solvent dielectric constant and refractive index...
August 19, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28805382/tuning-cycloparaphenylene-host-properties-by-chemical-modification
#2
Paolo Della Sala, Carmen Talotta, Tonino Caruso, Margherita De Rosa, Annunziata Soriente, Placido Neri, Carmine Gaeta
[8]Cycloparaphenylene derivative 1 has been synthesized and its recognition abilities toward pyridinium guests have been investigated and compared with the [8]CPP macrocycle. The results showed a fine tuning of the binding properties of [8]CPP 1 toward pyridinium cations due to the presence of 1,4-DMB ring. DFT calculations indicate that the close steric fitting between the rigid cavity of 1 and the pyridinium guest is the crucial factor for the stabilization of their supramolecular complex through C-H···π and N+···π1,4DMB interactions...
August 14, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28726875/time-resolved-spectroscopic-analysis-of-the-light-energy-harvesting-mechanism-in-carbazole-dendrimers-with-a-blue-phosphorescent-ir-complex-core
#3
Yang-Jin Cho, So-Yoen Kim, Mi Rang Son, Ho-Jin Son, Dae Won Cho, Sang Ook Kang
In order to investigate the light-energy harvesting mechanism, a series of dendrimers with a heteroleptic iridium(iii) complex core, [Ir(dmb)2(pic-Czn)] (Gn: n = 1, 2, and 3), with 2,6-difluoro-3-(4-methylpyridin-2-yl)benzonitrile (dmb) as the cyclometallating ligand and 3-hydroxypicolinate (pic) as the ancillary ligand, connected to carbazole-based dendrons (Czn: n = 2, 4, and 8) was synthesized. The Ir centred complex [Ir(dmb)2(pic-OCH3), G0] shows a blue emission at <500 nm, which is assigned to metal-to-ligand charge-transfer ((3)MLCT) phosphorescence...
July 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28715135/chronic-pharmacological-blockade-of-the-na-ca-2-exchanger-modulates-the-growth-and-development-of-the-purkinje-cell-dendritic-arbor-in-mouse-cerebellar-slice-cultures
#4
Pradeep Sherkhane, Josef P Kapfhammer
The Na(+) /Ca(2+) exchanger (NCX) is a bi-directional plasma membrane antiporter involved in Ca(2+) homeostasis in eukaryotes. NCX has three isoforms, NCX1-3, and all of them are expressed in the cerebellum. Immunostaining on cerebellar slice cultures indicates that NCX is widely expressed in the cerebellum, including expression in Purkinje cells. The pharmacological blockade of the forward mode of NCX (Ca(2+) efflux mode) by Bepridil moderately inhibited growth and development of Purkinje cell dendritic arbor in cerebellar slice cultures...
July 17, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28678519/intermittent-hypoxia-and-hypercapnia-accelerate-atherosclerosis-partially-via-trimethylamine-oxide
#5
Jin Xue, Dan Zhou, Orit Poulsen, Toshihiro Imamura, Yu-Hsin Hsiao, Travis H Smith, Atul Malhotra, Pieter Dorrestein, Rob Knight, Gabriel G Haddad
RATIONALE: Obstructive sleep apnea (OSA) is a common disorder characterized by intermittent hypoxia and hypercapnia (IHC) during sleep. OSA has been shown as a risk factor for atherosclerosis but the relation of IHC to induction or progression of atherosclerosis is not well understood. To dissect the mechanisms involved, we compared atherosclerotic formation between two mouse models, i.e., the apolipoprotein E (ApoE) and the low density lipoprotein receptor (Ldlr) deficient mice, with or without IHC exposure...
July 5, 2017: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/28616145/a-family-of-cis-macrocyclic-diphosphines-modular-stereoselective-synthesis-and-application-in-catalytic-co2-ethylene-coupling
#6
Ioana Knopf, Daniel Tofan, Dirk Beetstra, Abdulaziz Al-Nezari, Khalid Al-Bahily, Christopher C Cummins
A family of cis-macrocyclic diphosphines was prepared in just three steps from white phosphorus and commercial materials using a modular synthetic approach. Alkylation of bicyclic diphosphane 3,4,8,9-tetramethyl-1,6-diphosphabicyclo(4.4.0)deca-3,8-diene, or P2(dmb)2, produced phosphino-phosphonium salts [R-P2(dmb)2]X, where R is methyl, benzyl and isobutyl, in yields of 90-96%. Treatment of these salts with organolithium or Grignard reagents yielded symmetric and unsymmetric macrocyclic diphosphines of the form cis-1-R-6-R'-3,4,8,9-tetramethyl-2,5,7,10-tetrahydro-1,6-DiPhospheCine, or R,R'-DPC, in which R' is methyl, cyclohexyl, phenyl or mesityl, in yields of 46-94%...
February 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28611682/elevated-circulating-trimethylamine-n-oxide-levels-contribute-to-endothelial-dysfunction-in-aged-rats-through-vascular-inflammation-and-oxidative-stress
#7
Tiejun Li, Yanli Chen, Chaojun Gua, Xiaodong Li
Vascular endothelial dysfunction, a characteristic of the aging process, is an important risk factor for cardiovascular disease in aging. Although, vascular inflammation and oxidative stress are major contributors to endothelial dysfunction in aging, the underlying mechanisms during the aging process are not fully understood. Accumulating evidence reveals that gut microbiota-dependent metabolite trimethylamine-N-oxide (TMAO) is implicated in the pathogenesis of many cardiovascular diseases. We tested the hypothesis that aging increases circulating TMAO levels, which induce vascular inflammation and oxidative stress, resulting in age-associated endothelial dysfunction...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28610913/correlation-between-urinary-gag-and-anti-idursulfase-ert-neutralizing-antibodies-during-treatment-with-nicit-immune-tolerance-regimen-a-case-report
#8
Sarah Kim, Chester B Whitley, Jeanine R Jarnes Utz
INTRODUCTION: Antibodies to intravenous idursulfase enzyme replacement therapy (ERT) for patients with Hunter syndrome (mucopolysaccharidosis type II, MPS II) can have a harmful clinical impact, including both increasing risk of infusion reactions and inhibiting therapeutic activity. Thus, failure to monitor anti-idursulfase antibodies and neutralizing antibodies, and delays in reporting results, may postpone critical clinical decisions. HYPOTHESIS: Urinary glycosaminoglycan (GAG) levels may be used as a biomarker for anti-idursulfase antibodies and neutralizing antibodies to improve timeliness in monitoring and managing ERT...
June 3, 2017: Molecular Genetics and Metabolism
https://www.readbyqxmd.com/read/28554742/immunohistochemical-investigation-of-topoii%C3%AE-h3k27me3-and-jmjd3-expressions-in-medulloblastoma
#9
Jing Chen, Junxia Zhao, Xiaofen Zhou, Shuang Liu, Yongxin Yan, Yanling Wang, Cuili Cao, Shou Han, Najing Zhou, Yannan Xu, Juan Zhao, Yunli Yan, Huixian Cui
Topoisomerase IIβ (topoIIβ) is a nuclear enzyme specifically expressed in neurons, and plays an important role in the development of the cerebellum. To date, the expression of topoIIβ protein in medulloblastoma (MB) has not been investigated. In this study, 16 MB specimens including 10 classical subtypes of MB and 6 desmoplastic subtypes of MB (DMB), along with 5 normal cerebellum samples, were obtained from clinics. With immunohistochemical staining, prominently expressed topoIIβ was seen in normal cerebellar tissues, while there was no or less pronounced staining in classical MB cells...
August 2017: Pathology, Research and Practice
https://www.readbyqxmd.com/read/28511064/design-synthesis-and-evaluation-of-anticancer-activity-of-ruthenium-ii-polypyridyl-complexes
#10
Bing Tang, Dan Wan, Shang-Hai Lai, Hui-Hui Yang, Cheng Zhang, Xiu-Zhen Wang, Chuan-Chuan Zeng, Yun-Jun Liu
A new ligand PFPIP (PFPIP=2-(2,3,4,5,6-pentafluorophenyl)[4,5-f]imadazo [1,10]phenanthroline) and its four ruthenium(II) polypyridyl complexes [Ru(NN)2(PFPIP)](ClO4)2 (NN=dmb: 4,4'-dimethyl-2,2'-bipyridine, 1; bpy: 2,2'-bipyridine, 2; phen: 1,10-phenanthroline, 3; dmp: 2,9-dimethyl-1,10-phenanthroline, 4) were synthesized and characterized by elemental analysis, IR, (1)H NMR, (13)C NMR and ESI-MS. The cytotoxic activity in vitro of the ligand and complexes toward BEL-7402, A549, HeLa, HepG2 and MG-63 cell lines was evaluated using MTT method (MTT=(3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide)...
May 10, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28509534/analysis-of-three-epoetin-alpha-products-by-lc-and-lc-ms-indicates-differences-in-glycosylation-critical-quality-attributes-including-sialic-acid-content
#11
Rebecca I Thomson, Richard A Gardner, Katja Strohfeldt, Daryl L Fernandes, Graham P Stafford, Daniel I R Spencer, Helen M I Osborn
Erythropoietin (EPO) is one of the main therapeutics used to treat anemic patients, greatly improving their quality of life. In this study, biosimilars Binocrit and a development product, called here CIGB-EPO, were compared to the originator product, Eprex. All three are epoetin alpha products, reputed to have similar glycosylation profiles. The quality, safety, and efficacy of this biotherapeutic depend on the following glycosylation critical quality attributes (GCQAs): sialylation, N-glycolyl-neuraminic acid (Neu5Gc) content, branching, N-acetyl-lactosamine (LacNAc) extensions, and O-acetylation pattern...
June 9, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28508123/photochemically-controlled-drug-dosing-from-a-polymeric-scaffold
#12
Louise Donnelly, John G Hardy, Sean P Gorman, David S Jones, Nicola J Irwin, Colin P McCoy
PURPOSE: To develop the first photoactive biomaterial coating capable of controlled drug dosing via inclusion of synthesised drug-3,5-dimethoxybenzoin (DMB) conjugates in a poly(2-methyoxyethyl acrylate) (pMEA) scaffold. METHODS: Flurbiprofen- and naproxen-DMB conjugates were prepared via esterification and characterised via NMR spectroscopy and mass spectrometry following chromatographic purification. Conjugate photolysis was investigated in acetonitrile solution and within the pMEA matrix following exposure to low-power 365 nm irradiation...
July 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/28472754/ruthenium-ii-polypyridyl-complexes-synthesis-characterization-and-anticancer-activity-studies-on-bel-7402-cells
#13
Dan Wan, Shang-Hai Lai, Chuan-Chuan Zeng, Cheng Zhang, Bing Tang, Yun-Jun Liu
Two new ligand PTTP (2-phenoxy-1,4,8,9-tetraazatriphenylene) and FTTP (2-(3-fluoronaphthalen-2-yloxy)-1,4,8,9-tetraazatriphenylene) and their six ruthenium(II) polypyridyl complexes [Ru(N-N)2(PTTP)](ClO4)2 and [Ru(N-N)2(FTTP)](ClO4)2 (N-N=dmb: 4,4'-dimethyl-2,2'-bipiridine; dmp: 2,9-dimethyl-1,10-phenanthroline; ttbpy: 4,4'-ditertiarybutyl-2,2'-bipyridine) were synthesized and characterized. The cytotoxic activity of the complexes against cancer cells HeLa, BEL-7402, A549, HepG-2, HOS and normal cell LO2 was evaluated by MTT method...
April 27, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28472541/exploring-and-exploiting-acceptor-preferences-of-the-human-polysialyltransferases-as-a-basis-for-an-inhibitor-screen
#14
Jörg Ehrit, Timothy G Keys, Mark Sutherland, Saskia Wolf, Chris Meier, Robert A Falconer, Rita Gerardy-Schahn
α2,8-Linked polysialic acid (polySia) is an oncofoetal antigen with high abundance during embryonic development. It reappears in malignant tumours of neuroendocrine origin. Two polysialyltransferases (polySTs) ST8SiaII and IV are responsible for polySia biosynthesis. During development, both enzymes are essential to control polySia expression. However, in tumours ST8SiaII is the prevalent enzyme. Consequently, ST8SiaII is an attractive target for novel cancer therapeutics. A major challenge is the high structural and functional conservation of ST8SiaII and -IV...
July 4, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28463762/novel-copper-ii-complexes-with-hydrazides-and-heterocyclic-bases-synthesis-structure-and-biological-studies
#15
Drielly A Paixão, Ivana M Marzano, Edgar H L Jaimes, Marcos Pivatto, Débora L Campos, Fernando R Pavan, Victor M Deflon, Pedro Ivo da S Maia, Ana M Da Costa Ferreira, Isadora A Uehara, Marcelo J B Silva, Françoise V Botelho, Elene C Pereira-Maia, Silvana Guilardi, Wendell Guerra
Five new copper(II) complexes of the type [Cu(NO)(NN)(ClO4)2], in which NO=4-fluorophenoxyacetic acid hydrazide (4-FH) or 4-nitrobenzoic hydrazide (4-NH) and NN=1,10-phenanthroline (phen), 4-4'-dimethoxy-2-2'-bipyridine (dmb) or 2,2-bipyridine (bipy) were synthesized and characterized using various spectroscopic methods. The X-ray structural analysis of one representative compound indicates that the geometry around the copper ion is distorted octahedron, in which the ion is coordinated to hydrazide via the terminal nitrogen and the carbonyl oxygen, and to heterocyclic bases via their two nitrogen atoms...
April 26, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28433952/what-chickens-might-tell-us-about-the-mhc-class-ii-system
#16
REVIEW
Aimée Parker, Jim Kaufman
Almost all knowledge about the structure and function of MHC class II molecules outside of mammals comes from work with chickens. Most of the genes implicated in the class II system are present in chickens, so it is likely that the machinery of antigen processing and peptide-loading is similar to mammals. However, there is only one isotype (lineage) of classical class II genes, with one monomorphic DR-like BLA gene and two polymorphic BLB genes, located near one DMA and two DMB genes. The DMB2 and BLB2 genes are widely expressed at high levels, whereas the DMB1 and BLB1 genes are only expressed at highest levels in spleen and intestine, suggesting the possibility of two class II systems in chickens...
June 2017: Current Opinion in Immunology
https://www.readbyqxmd.com/read/28432633/synthesis-spectral-properties-and-dft-calculations-of-new-ruthenium-ii-polypyridyl-complexes-dna-binding-affinity-and-in-vitro-cytotoxicity-activity
#17
Rajender Reddy Mallepally, Nagamani Chintakuntla, Venkat Reddy Putta, Nagasuryaprasad K, Ravi Kumar Vuradi, Madhuri P, Satyanarayana Singh S, Ramesh Kumar Chitumalla, Joonkyung Jang, Nagababu Penumaka, Satyanarayana Sirasani
In this paper a novel ligand debip (2-(4-N,N-diethylbenzenamine)1H-imidazo[4,5-f] [1, 10]phenanthroline) and its Ru(II) polypyridyl complexes [Ru(L)2(debip)](2+), (L = phen (1), bpy (2) and dmb (3)) have been synthesized and characterized by spectroscopic techniques. The DNA binding studies for all these complexes were examined by absorption, emission, quenching studies, viscosity measurements and cyclic voltammetry. The light switching properties of complexes 1-3 have been evaluated. Molecular docking, Density Functional Theory (DFT) and time dependent DFT calculations were performed...
April 22, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28379113/comparison-of-health-parameters-in-normal-cats-fed-a-limited-iodine-prescription-food-vs-a-conventional-diet
#18
Inke Paetau-Robinson, Lynda D Melendez, S Dru Forrester, Laura J Armbrust, Kent R Refsal, Patricia A Burris
Objectives The objective was to compare the effect on thyroid function in healthy, adult cats fed a limited iodine food or conventional diet for 24 months. Methods Cats in the limited iodine group (n = 14) were fed a commercial, dry food containing 0.2 ppm iodine on a dry-matter basis (DMB). Cats in the conventional diet group (n = 12) were fed an identical diet except that the iodine content was 3.2 ppm on a DMB. Both groups were maintained on their respective diets for 24 months. The median age of the cats at baseline was 3...
April 1, 2017: Journal of Feline Medicine and Surgery
https://www.readbyqxmd.com/read/28377725/gut-microbiota-dependent-metabolite-trimethylamine-n-oxide-contributes-to-cardiac-dysfunction-in-western-diet-induced-obese-mice
#19
Kui Chen, Xiaoqian Zheng, Mingchen Feng, Dongliang Li, Hongqi Zhang
Excessive consumption of diets high in sugars and saturated fat, frequently known as western diet (WD), may lead to obesity and metabolic syndrome. Recent evidence shows that WD-induced obesity impairs cardiac function, but the underlying mechanisms are not fully understood. Trimethylamine N-oxide (TMAO), a gut microbiota-dependent metabolite of specific dietary nutrients, has emerged as a key contributor to cardiovascular disease pathogenesis. We tested the hypothesis that elevated circulating TMAO levels contribute to cardiac dysfunction in WD-induced obesity...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28356347/leukocyte-phosphodiesterase-expression-after-lipopolysaccharide-and-during-sepsis-and-its-relationship-with-hla-dr-expression
#20
Christophe Lelubre, Hayfa Medfai, Israa Akl, Jenneke Leentjens, Matthijs Kox, Peter Pickkers, Alexandre Rousseau, Patrick Biston, Michael Piagnerelli, Michel Vanhaeverbeek, Pierrick Uzureau, Jean-Louis Vincent, Luc Vanhamme, Karim Zouaoui Boudjeltia
Phosphodiesterases (PDEs) may modulate inflammatory pathways, but PDE expression is poorly documented in humans with sepsis. Using quantitative PCR on whole blood leukocytes, we characterized PDE mRNA expression in healthy volunteers (n = 20), healthy volunteers given lipopolysaccharide (LPS; n = 18), and critically ill patients with (n = 20) and without (n = 20) sepsis. PDE4B protein expression was also studied in magnetic-activated cell sorting (MACS)-isolated CD15(+) neutrophils (from 7 healthy volunteers, 5 patients without and 5 with sepsis)...
March 29, 2017: Journal of Leukocyte Biology
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