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https://www.readbyqxmd.com/read/28699682/2-3-7-8-tetrachlorodibenzo-p-dioxin-promotes-endothelial-cell-apoptosis-through-activation-of-ep3-p38mapk-bcl-2-pathway
#1
Yu Yu, Qian Liu, Shumin Guo, Qianqian Zhang, Juan Tang, Guizhu Liu, Deping Kong, Juanjuan Li, Shuai Yan, Ruiguo Wang, Peilong Wang, Xiaoou Su, Ying Yu
Endothelial injury or dysfunction is an early event in the pathogenesis of atherosclerosis. Epidemiological and animal studies have shown that 2, 3, 7, 8-tetrachlorodibenzo-p-dioxin (TCDD) exposure increases morbidity and mortality from chronic cardiovascular diseases, including atherosclerosis. However, whether or how TCDD exposure causes endothelial injury or dysfunction remains largely unknown. Cultured human umbilical vein endothelial cells (HUVECs) were exposed to different doses of TCDD, and cell apoptosis was examined...
July 12, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28682478/water-bridged-h-bonding-network-contributes-to-the-catalysis-of-a-sam-dependent-c-methyltransferase-hcgc
#2
Liping Bai, Tristan Wagner, Tao Xu, Xile Hu, Ulrich Ermler, Seigo Shima
[Fe]-hydrogenase contains the iron-guanylylpyridinol (FeGP) cofactor 1. The FeGP cofactor contains a pyridinol ring substituted by GMP, two methyl and an acylmethyl groups. HcgC, an enzyme of FeGP biosynthesis, catalyzes the methyl transfer from S-adenosylmethionine (SAM) to C3 of 6-carboxymethyl-5-methyl-4-hydroxy-2-pyridinol 2. Here, we report on the ternary structure of HcgC-S-adenosylhomocysteine (SAH, the demethylated product of SAM) and 2 at 1.7 Å resolution. The proximity of C3 of 2 and S of SAH indicates a catalytically productive geometry...
July 6, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28664658/effects-of-aspirin-dose-escalation-on-platelet-function-and-urinary-thromboxane-and-prostacyclin-levels-in-normal-dogs
#3
N McLewee, T Archer, R Wills, A Mackin, J Thomason
Established "low" aspirin dosages inconsistently inhibit platelet function in dogs. Higher aspirin dosages consistently inhibit platelet function, but are associated with adverse effects. The objectives of this study were to use an escalation in dosage to determine the lowest aspirin dosage that consistently inhibited platelet function without inhibiting prostacyclin synthesis. Eight dogs were treated with five aspirin dosages: 0.5 mg/kg q24h, 1 mg/kg q24h, 2 mg/kg q24h, 4 mg/kg q24h and 10 mg/kg q12h for 7 days...
June 30, 2017: Journal of Veterinary Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28651911/conformational-studies-of-gram-negative-bacterial-quorum-sensing-3-oxo-n-acyl-homoserine-lactone-molecules
#4
Darren Crowe, Alan Nicholson, Adrienne Fleming, Ed Carey, Goar Sánchez-Sanz, Fintan Kelleher
In their (1)H NMR spectra in CDCl3 3-oxo-N-acyl homoserine lactones (OHLs) show significant downfield chemical shifts of the amide NH proton when compared to the parent N-acyl homoserine lactones (AHLs). NMR spectroscopic and DFT calculation studies have shown that this is most likely due to the presence of a stabilising intramolecular H-bond from the NH to the 3-oxo group. The (1)H NMR spectra also show evidence for the enol tautomers and that the amount of enol present for a range of OHLs is 4.1-4.5% in CDCl3 and 6...
June 8, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28646078/stereospecific-metabolism-of-r-and-s-warfarin-by-human-hepatic-cytosolic-reductases
#5
Dustyn A Barnette, Bryce Johnson, Dakota L Pouncey, Robert Nshimiyimana, Linda Desrochers, Thomas E Goodwin, Grover Paul Miller
Coumadin (rac-warfarin) is the most commonly used anticoagulant in the world, yet its clinical use is often challenging due to a narrow therapeutic range and inter-individual variations in response. A critical contributor to the uncertainty is variability in warfarin metabolism, which includes mostly oxidative but also reductive pathways. Reduction of each warfarin enantiomer yields two warfarin alcohol isomers, and the corresponding four alcohols retain varying levels of anticoagulant activity. Studies on the kinetics of warfarin reduction have often lacked resolution of parent drug enantiomers and suffered from co-elution of pairs of alcohol metabolites; thus, those studies fail to establish the importance of individual, stereospecific reductive pathways...
June 23, 2017: Drug Metabolism and Disposition: the Biological Fate of Chemicals
https://www.readbyqxmd.com/read/28633109/endothelial-nlrp3-inflammasome-activation-and-arterial-neointima-formation-associated-with-acid-sphingomyelinase-during-hypercholesterolemia
#6
Saisudha Koka, Min Xia, Yang Chen, Owais M Bhat, Xinxu Yuan, Krishna M Boini, Pin-Lan Li
The NLRP3 inflammasome has been reported to be activated by atherogenic factors, whereby endothelial injury and consequent atherosclerotic lesions are triggered in the arterial wall. However, the mechanisms activating and regulating NLRP3 inflammasomes remain poorly understood. The present study tested whether acid sphingomyelinase (ASM) and ceramide associated membrane raft (MR) signaling platforms contribute to the activation of NLRP3 inflammasomes and atherosclerotic lesions during hypercholesterolemia. We found that 7-ketocholesterol (7-Keto) or cholesterol crystal (ChC) markedly increased the formation and activation of NLRP3 inflammasomes in mouse carotid arterial endothelial cells (CAECs), as shown by increased colocalization of NLRP3 with ASC or caspase-1, enhanced caspase-1 activity and elevated IL-1β levels, which were markedly attenuated by mouse Asm siRNA, ASM inhibitor- amitriptyline, and deletion of mouse Asm gene...
June 15, 2017: Redox Biology
https://www.readbyqxmd.com/read/28631488/synthesis-of-6-7-dideoxysqualestatin-h5-by-carbonyl-ylide-cycloaddition-rearrangement-and-cross-electrophile-coupling
#7
Younes Fegheh-Hassanpour, Tanzeel Arif, Herman O Sintim, Hamad H Al Mamari, David M Hodgson
An asymmetric synthesis of (-)-6,7-dideoxysqualestatin H5 is reported. Key features of the synthesis include the following: (1) highly diastereoselective n-alkylation of a tartrate acetonide enolate and subsequent oxidation-hydrolysis to provide an asymmetric entry to a β-hydroxy-α-ketoester motif; (2) facilitation of Rh(II)-catalyzed cyclic carbonyl ylide formation-cycloaddition by co-generation of keto and diazo functionality through ozonolysis of an unsaturated hydrazone; and (3) stereoretentive Ni-catalyzed Csp(3)-Csp(2) cross-electrophile coupling between tricarboxylate core and unsaturated side chain to complete the natural product...
June 20, 2017: Organic Letters
https://www.readbyqxmd.com/read/28625001/nanostructured-sba-15-host-applied-in-ketorolac-tromethamine-release-system
#8
Jorgelina Cussa, Juliana M Juárez, Marcos B Gómez Costa, Oscar A Anunziata
The ordered mesoporous silica SBA-15 has been applied in studies of ketorolac tromethamine adsorption and release. The SBA-15 materials with hexagonal and regular structure were obtained using a triblock copolymer Pluronic P123 as a template and TEOS as a silica source. Ketorolac tromethamine was adsorbed into SBA-15 silica nanochannels using ethanol as solvent. The physicochemical and textural properties of SBA-15 and ketorolac tromethamine/SBA-15 were characterized by X-ray diffraction, thermogravimetric analysis, transmission electron microscopy, fourier transform infrared spectroscopy and BET surface studies...
August 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28615924/comparison-of-the-frequency-of-use-of-a-pupil-expansion-device-with-and-without-an-intracameral-phenylephrine-and-ketorolac-injection-1-0-3-at-the-time-of-routine-cataract-surgery
#9
Frank A Bucci, Breanne Michalek, Angel T Fluet
PURPOSE: The objective of this study is to evaluate whether a phenylephrine and ketorolac injection 1%/0.3% (phenyl/keto injection) (Omidria(®)) prior to capsulotomy decreases the need for the Malyugin Ring(®) to manage small pupils. SETTING: Bucci Laser Vision Institute, Wilkes-Barre, PA, USA. DESIGN: Retrospective analysis of cataract surgeries performed by a single surgeon at a single center. METHODS: A historical control group of 1,004 consecutive cases (December 2013 to February 2015) did not receive a phenyl/keto intracameral injection prior to capsulotomy and were compared with 915 consecutive cases in the treatment group (June 2015 to April 2016) for the rate of use of the Malyugin Ring...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28593141/glycosyl-chains-and-25-hydroxycholesterol-contribute-to-the-intracellular-transport-of-amyloid-beta-a%C3%AE-42-in-jurkat-t-cells
#10
Neha Sharma, KeangOK Baek, Huong T T Phan, Naofumi Shimokawa, Masahiro Takagi
Amyloid beta (Aβ) is a peptide responsible for the development of Alzheimer's disease (AD). Misfolding and accumulation of endogenous Aβ can lead to neural cell apoptosis through endoplasmic reticulum (ER) stress. Added exogenous Aβ can also result in ER stress, leading to neurotoxicity and apoptosis, which is identical to that caused by the endogenous peptide. We have speculated that the endocytic transport of Aβ causes ER stress and have previously shown that the oxysterol, in particular, 7-ketocholesterol (7-keto) induces more surface interaction between Aβ-42 and Jurkat cells than cholesterol...
June 2017: FEBS Open Bio
https://www.readbyqxmd.com/read/28558210/excited-state-dynamics-of-2-2-hydroxyphenyl-benzothiazole-ultrafast-proton-transfer-and-internal-conversion
#11
Shiela Pijeau, Donneille Foster, Edward G Hohenstein
One of the most widely studied model systems for excited-state proton transfer (ESPT) is the 2-(2'-hydroxyphenyl)benzothiazole (HBT) molecule. This compound undergoes ultrafast ESPT followed by internal conversion to return to the ground state. In the present work, we simulate the nonadiabatic photochemistry of HBT using ab initio multiple spawning (AIMS) nuclear dynamics and a complete active space configuration interaction (CASCI) method in conjunction with wave function-in-DFT embedding to obtain ground- and excited-state potential surfaces on-the-fly...
June 8, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28544633/extraction-and-purification-of-five-terpenoids-from-olibanum-by-ultrahigh-pressure-technique-and-high-speed-countercurrent-chromatography
#12
Jinqian Yu, Hongwei Zhao, Daijie Wang, Xiangyun Song, Lei Zhao, Xiao Wang
Five terpenoids, including two new ones, 3,7-dioxo-tirucalla-8,24-dien-21-oic acid (2) and 3α-acetoxyl-7-oxo-tirucalla-8,24-dien-21-oic acid (3), and three known ones, boscartol A (1), 11-keto-β-boswellic acid (4), and acetyl-11-keto-boswellic acid (5), have been extracted by the ultrapressure extraction and purified by pH-zone-refining countercurrent chromatography and high-speed countercurrent chromatography from olibanum. For ultrapressure extraction, the optimal condition including 200 MPa of extraction pressure, ethyl acetate of extraction solvent, 1:20 (g/mL) of solid/liquid ratio, and 2 min of extraction time were obtained...
July 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28511808/astaxanthin-from-shrimp-efficiently-modulates-oxidative-stress-and-allied-cell-death-progression-in-mcf-7-cells-treated-synergistically-with-%C3%AE-carotene-and-lutein-from-greens
#13
Poorigali Raghavendra-Rao Sowmya, Bangalore Prabhashankar Arathi, Kariyappa Vijay, Vallikannan Baskaran, Rangaswamy Lakshminarayana
This study investigated the synergistic efficacy of keto-carotenoid astaxanthin (AST, from shrimp) plus hydrocarbon (β-carotene, BC) and hydroxyl (lutein, L) carotenoids (from greens) on molecular events in MCF-7 cells. MCF-7 cells were treated with either of carotenoid (20 μM, AST or BC or L) separately or the mixture of them (an equimolar concentration of carotenoids mixture, CM) or saponified carotenoid extract from shrimp (SSCE) for 48 h and analyzed cellular uptake, cytotoxicity, and apoptosis. The IC50 and combination-index values of AST co-treatment with a lower concentration of BC and L (5 μM) exhibited enhanced cytotoxicity and oxidative stress as compared with individual carotenoids or SSCE...
May 13, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28474360/anchimeric-assisted-spontaneous-hydrolysis-of-cyanohydrins-under-ambient-conditions-implications-for-cyanide-initiated-selective-transformations
#14
Jayasudhan Reddy Yerabolu, Charles L Liotta, Ramanarayanan Krishnamurthy
Nitrile/cyanide hydrolysis is of importance from the perspective of organic chemistry, especially, prebiotic chemistry. Herein we report that cyanohydrins, generated by the reaction of cyanide with β-keto acids and γ-keto-alcohols, spontaneously hydrolyze under ambient conditions (aqueous medium, RT, and a range of pH). The spontaneous hydrolysis is affected by an intramolecular proton transfer and an intramolecular 5-exo-dig attack, but with a twist. In the case of β-keto acids, the hydrolysis is mediated by the neighboring carboxylic acid group only at pH values less than 7, whereas in the case of γ-keto-alcohols the hydrolysis is mediated by the neighboring hydroxyl group only at pH values greater than 7...
May 4, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28465708/rs5911-and-rs3842788-genetic-polymorphism-blood-stasis-syndrome-and-plasma-txb2-and-hs-crp-levels-are-associated-with-aspirin-resistance-in-chinese-chronic-stable-angina-patients
#15
Mei Xue, Xuesong Yang, Lin Yang, Na Kou, Yu Miao, Mingming Wang, Junhua Ren, Quanli Zhao
The identification of single nucleotide polymorphisms (SNPs) related to aspirin resistance (AR) is of great significance for the explanation why some individuals demonstrate an incomplete response to aspirin and for optimizing the antiplatelet therapy strategy. The study was designed to investigate the possible associated genetic markers and clinical factors of AR for Chinese patients with chronic stable angina after PCI and to analyze the association between TXA2, PGI2, hs-CRP level, AR, and gene polymorphisms...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28453264/polymorphous-al-mofs-based-on-v-shaped-linker-molecules-synthesis-properties-and-in-situ-investigation-of-their-crystallization
#16
Martin Krüger, A Ken Inge, Helge Reinsch, Yuan-Han Li, Mohammad Wahiduzzaman, Chia-Her Lin, Sue-Lein Wang, Guillaume Maurin, Norbert Stock
The in situ and systematic high-throughput investigation of the system Al(3+)/4,4'-benzophenonedicarboxylic acid (H2BPDC)/DMF/H2O in the presence of various additives was carried out, and a new Al-MOF of composition [Al(OH)(BPDC)], denoted as CAU-21-BPDC, was obtained. Its crystal structure was determined from single-crystal X-ray diffraction data (space group I422, a = b = 17.2528(7) Å, c = 23.864(1) Å). The structure is built up by octanuclear rings of cis corner-sharing AlO6 polyhedra forming the inorganic building unit (IBU)...
April 28, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28431863/the-myometrial-contractility-during-late-pregnancy-in-dairy-cows-in-vitro
#17
L Górriz-Martín, S E Ulbrich, M Schmicke, G Hirsbrunner, C Keller, N Yücesoy, C Pfarrer, H Bollwein, M Heppelmann
This study aimed to investigate the in vitro contractility of the myometrium and its relationship to the blood concentrations of estradiol-17β (E2β), progesterone (P4), 15-keto-13,14-dihydro-PGF2α (PGFM) and ionised calcium (Ca(2+)) prior to tissue harvest in 12 healthy Holstein-Friesian cows in late pregnancy. Three circular (CM) and 3 longitudinal myometrial (LM) strips were dissected during a caesarean section and mounted in an organ bath containing modified Krebs solution (KS). The spontaneous contractility was recorded during five 30-min time periods (T1 to T5), after which the strips were exposed to increasing concentrations of oxytocin (OT; 10(-10)-10(-7)M), a natural PGF2α-analogue (PGF; 10(-7)-10(-4)M) and KS (Cont) for four 30-min time periods (T6 to T9)...
April 7, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28422067/synthesis-characterization-antimicrobial-and-antiproliferative-activity-evaluation-of-cu-ii-co-ii-zn-ii-ni-ii-and-pt-ii-complexes-with-isoniazid-derived-compound
#18
Elena Pahonțu, Diana-Carolina Ilieș, Sergiu Shova, Camelia Oprean, Virgil Păunescu, Octavian Tudorel Olaru, Flavian Ștefan Rădulescu, Aurelian Gulea, Tudor Roșu, Doina Drăgănescu
Hydrazone complexes of Cu(II), Co(II), Zn(II), Ni(II) and Pt(II) with N-isonicotinoyl-N'-(3-metoxy-2 hydroxybenzaldehyde)-hydrazone (HL) were synthesized and characterized by different physico-chemical techniques including elemental and thermal analysis, magnetic susceptibility measurements, molar electric conductivity, as well as IR (infrared), ¹H-NMR and (13)C-NMR (hydrogen and carbon nuclear magnetic resonance, UV-Vis (ultraviolet-visible), FAB (fast atom bombardment), EPR (electron paramagnetic resonance), and mass spectroscopies...
April 19, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28420137/modification-of-the-mycotoxin-deoxynivalenol-using-microorganisms-isolated-from-environmental-samples
#19
Nina M Wilson, Nicole McMaster, Dash Gantulga, Cara Soyars, Susan P McCormick, Ken Knott, Ryan S Senger, David G Schmale
The trichothecene mycotoxin deoxynivalenol (DON) is a common contaminant of wheat, barley, and maize. New strategies are needed to reduce or eliminate DON in feed and food products. Microorganisms from plant and soil samples collected in Blacksburg, VA, USA, were screened by incubation in a mineral salt media containing 100 μg/mL DON and analysis by gas chromatography mass spectrometry (GC/MS). Two mixed cultures derived from soil samples consistently decreased DON levels in assays using DON as the sole carbon source...
April 15, 2017: Toxins
https://www.readbyqxmd.com/read/28402270/akr1b10-promotes-breast-cancer-cell-migration-and-invasion-via-activation-of-erk-signaling
#20
Jia Li, Yuanwei Guo, Lili Duan, Xinglin Hu, Xi Zhang, Jian Hu, Li Huang, Rongzhang He, Zheng Hu, Weihao Luo, Tan Tan, Renbin Huang, Duanfang Liao, Yuan-Shan Zhu, Di-Xian Luo
BACKGROUND: Aldo-keto reductase family 1, member B10 (AKR1B10), is known to be significantly induced in the cells of various cancers such as breast cancer. However, the mechanisms of AKR1B10 promoting tumorigenesis in breast cancer remain unclear. In the present study, we demonstrated the potential role and mechanism of AKR1B10 in the invasion and migration of breast cancer cells. METHODS: The expression level of AKR1B10 in breast carcinoma, para-carcinoma and cancer tissues were detected by immunohistochemical evaluation and real-time polymerase chain reaction (RT-PCR), and the correlationships between AKR1B10 expression and clinicopathological features in breast cancer patients (n=131) were investigated...
May 16, 2017: Oncotarget
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