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Superoxide anion

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https://www.readbyqxmd.com/read/28447385/ultrasound-enhances-calcium-absorption-of-jujube-fruit-by-regulating-the-cellular-calcium-distribution-and-metabolism-of-cell-wall-polysaccharides
#1
Huanhuan Zhi, Qiqi Liu, Juan Xu, Yu Dong, Mengpei Liu, Wei Zong
BACKGROUND: Ultrasound has been applied in fruit pre-washing processes. However, it is not sufficient to protect fruit from pathogenic infection throughout the entire storage period, and sometimes ultrasound causes tissue damage. The goal of this study was to investigate the effects of calcium chloride (10 g L(-1) ) and ultrasound (350 W at 40 kHz), separately and in combination, on fruit quality, antioxidant status, tissue Ca(2+) content and distribution along with cell wall metabolism at 20 °C for six days...
April 26, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28447293/shielding-of-the-geomagnetic-field-reduces-hydrogen-peroxide-production-in-human-neuroblastoma-cell-and-inhibits-the-activity-of-cuzn-superoxide-dismutase
#2
Hai-Tao Zhang, Zi-Jian Zhang, Wei-Chuan Mo, Ping-Dong Hu, Hai-Min Ding, Ying Liu, Qian Hua, Rong-Qiao He
Accumulative evidence has shown the adverse effects of a geomagnetic field shielded condition, so called a hypomagnetic field (HMF), on the metabolic processes and oxidative stress in animals and cells. However, the underlying mechanism remains unclear. In this study, we evaluate the role of HMF on the regulation of cellular reactive oxygen species (ROS) in human neuroblastoma SH-SY5Y cells. We found that HMF exposure led to ROS decrease, and that restoring the decrease by additional H2O2 rescued the HMF-enhanced cell proliferation...
April 26, 2017: Protein & Cell
https://www.readbyqxmd.com/read/28445049/inflammation-modulatory-phorbol-esters-from-the-seeds-of-aquilaria-malaccensis
#3
Vitthal D Wagh, Michal Korinek, I-Wen Lo, Yu-Ming Hsu, Shu-Li Chen, Hsue-Yin Hsu, Tsong-Long Hwang, Yang-Chang Wu, Bing-Hung Chen, Yuan-Bin Cheng, Fang-Rong Chang
The tree Aquilaria malaccensis is a valuable source of agarwood, which is used in herbal medicinal preparations. Phytochemical research on A. malaccensis seeds has led to the isolation of four new phorbol esters (1-4), two known phorbol esters (5, isolated from Nature for the first time, and 6), and two known glycerides (7 and 8). The structures of these isolates were elucidated by means of spectroscopic data interpretation. The inflammation-modulatory activities of the isolates on elastase release and superoxide anion generation in human neutrophils were evaluated...
April 26, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28443467/effect-of-irinotecan-on-hmgb1-mmp9-expression-cell-cycle-and-cell-growth-in-breast-cancer-mcf-7-cells
#4
Saeedeh Keyvani-Ghamsari, Azra Rabbani-Chadegani, Javad Sargolzaei, Maryam Shahhoseini
Irinotecan is a natural alkaloid agent widely used in cancer therapy. High-mobility group protein B1 as a non-histone chromosomal protein plays a fundamental role in gene expression and inflammation. In this study, the effect of irinotecan on high-mobility group protein B1 and MMP9 content, gene expression, cell cycle, and cell growth in human breast cancer cells (MCF-7) was investigated. The cells were exposed to various concentrations of irinotecan and the viability determined by trypan blue exclusion and 3-(4,5-dimethylthiazal-2-yl)-2,5-diphenyltetrazolium bromide assays...
April 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/28441031/lead-accumulation-and-distribution-in-maize-seedlings-relevance-to-biomass-sproduction-and-metal-phytoextraction
#5
Dmitry I Bashmakov, Alina N Kluchagina, Przemysław Malec, Kazimierz Strzałka, Alexander S Lukatkin
Among trace metals, lead is a highly toxic contaminant, being hazardous to humans and animals. Application of maize plants for phytoremediation of polluted soils and waters has recently been of particular interest. The aim of this work is to investigate the Pb-phytoextraction potential of the maize cv. Tzariza used widely in Eastern European agriculture. Maize seedlings were exposed in a nutrient solution to 0.1 - 10000 µM of Pb2+ for 21 days. Lead accumulated mostly in conductive tissues and shoots at 0...
April 25, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28438660/reaction-of-hypotaurine-or-taurine-with-superoxide-produces-the-organic-peroxysulfonic-acid-peroxytaurine
#6
Roxanna Q Grove, Steven J Karpowicz
Hypotaurine and taurine are amino acid derivatives and abundant molecules in many eukaryotes. The biological reaction in which hypotaurine is converted to taurine remains poorly understood. Here, hypotaurine and taurine were observed to react with superoxide anion in vitro to form the novel molecule peroxytaurine. In contrast, hypotaurine reacts with hydrogen peroxide to form taurine, but taurine does not react with hydrogen peroxide in vitro. Mass and NMR spectrometry as well as FTIR and Raman spectroscopy support the molecular characterization of peroxytaurine...
April 21, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28432550/estradiol-mitigates-ischemia-reperfusion-induced-acute-renal-failure-through-nmda-receptor-antagonism-in-rats
#7
Amrit Pal Singh, Nirmal Singh, Preet Mohinder Singh Bedi
In the present study, we investigated possible involvement of N-methyl-D-aspartate receptors (NMDAR) in estradiol mediated protection against ischemia reperfusion (I/R)-induced acute renal failure (ARF) in rats. Bilateral renal ischemia of 40 min followed by reperfusion for 24 h induced ARF in male wistar rats. Quantification of serum creatinine, creatinine clearance (CrCl), blood urea nitrogen (BUN), uric acid, potassium, fractional excretion of sodium (FeNa), and urinary microproteins was done to assess I/R-induced renal damage in rats...
April 21, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28430271/theoretical-modulation-of-singlet-triplet-chemiexcitation-of-chemiluminescent-imidazopyrazinone-dioxetanone-via-c8-substitution
#8
L Pinto da Silva, C M Magalhães, D M A Crista, J C G Esteves da Silva
Coelenterazine, a member of the imidazopyrazinone class of chemiluminescent substrates, presents significant potential as a dynamic probe of reactive oxygen species in a biological environment, such as a superoxide anion, in which these species are important in cellular biology and pathology. The objective of the current study was to understand in what way the efficiency of singlet and triplet chemiexcitation could be modulated, towards a more efficient use of imidazopyrazinone-based compounds as dynamic chemiluminescent probes...
April 21, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28427390/advanced-glycation-end-products-decreases-expression-of-endothelial-nitric-oxide-synthase-through-oxidative-stress-in-human-coronary-artery-endothelial-cells
#9
Xiaomei Ren, Liqun Ren, Qin Wei, Hua Shao, Long Chen, Naifeng Liu
BACKGROUND: Advanced glycation end-products (AGEs) are elevated under diabetic conditions and associated with insulin resistance, endothelial dysfunction and vascular inflammation in humans. It has been demonstrated that AGEs evoke oxidative and inflammatory reactions in endothelial cells through the interaction with a receptor for AGEs (RAGE). Here, we aimed to identify the cellular mechanisms by which AGEs exacerbate the endothelial dysfunction in human coronary artery endothelial cells (HCAECs)...
April 20, 2017: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/28417930/degradation-of-methyl-2-aminobenzoate-methyl-anthranilate-by-h%C3%A2-o%C3%A2-uv-effect-of-inorganic-anions-and-derived-radicals
#10
Grazia Maria Lanzafame, Mohamed Sarakha, Debora Fabbri, Davide Vione
This study shows that methyl 2-aminobenzoate (also known as methyl anthranilate, hereafter MA) undergoes direct photolysis under UVC and UVB irradiation and that its photodegradation is further accelerated in the presence of H₂O₂. Hydrogen peroxide acts as a source of hydroxyl radicals (·OH) under photochemical conditions and yields MA hydroxyderivatives. The trend of MA photodegradation rate vs. H₂O₂ concentration reaches a plateau because of the combined effects of H₂O₂ absorption saturation and ·OH scavenging by H₂O₂...
April 12, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28415737/peroxynitrite-dominates-sodium-nitroprusside-induced-apoptosis-in-human-hepatocellular-carcinoma-cells
#11
Ying-Yao Quan, Yu-Hong Liu, Chun-Mei Lin, Xiao-Ping Wang, Tong-Sheng Chen
This study aims to explore which radicals dominate sodium nitroprusside (SNP)-induced cytotoxicity in human hepatocellular carcinoma (HCC) cells (HepG2 and Hep3B). Exposure of SNP to cell medium produced abundant nitric oxide (NO), superoxide anion (O2•-), hydrogen peroxide (H2O2) and iron ions. SNP potently induced caspases activation, mitochondrial membrane permeabilization and apoptosis in HCC cells. In Hep3B cells, pretreatment with NO scavenger (PTIO) did not prevent SNP-induced cytotoxicity. However, in HepG2 cells, SNP-induced cytotoxicity was prevented significantly by pretreatment with PTIO and O2•- scavenger, and especially was almost completely blocked by pretreatment with FeTPPS (peroxynitrite scavenger)...
March 13, 2017: Oncotarget
https://www.readbyqxmd.com/read/28412336/antiageing-activities-of-water-soluble-chitosan-from-clanis-bilineata-larvae
#12
Shengjun Wu, Mingsheng Lu, Shujun Wang
Water extracts were prepared using water-soluble chitosan from Clanis bilineata larva skin. This study also investigated antioxidant and antiageing activities of water-soluble chitosan. Water-soluble chitosan of Clanis bilineata larva skin (CBLSWSC) showed considerable scavenging activities on superoxide anion and hydroxyl radicals and reducing capacity. Different doses of CBLSWSC were intragastrically administered on a d-galactose-induced-aged mouse model over a period of six weeks. Intragastric CBLSWSC administration significantly increased activities of superoxide dismutase and glutathione peroxidase and inhibited formation of malondialdehyde in brains and sera of mice in a dose-dependent manner...
April 12, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28409208/inhibitors-of-ceramide-de-novo-biosynthesis-rescue-damages-induced-by-cigarette-smoke-in-airways-epithelia
#13
Aida Zulueta, Anna Caretti, Giuseppe Matteo Campisi, Andrea Brizzolari, Jose Luis Abad, Rita Paroni, Paola Signorelli, Riccardo Ghidoni
Exposure to cigarette smoke represents the most important risk factor for the development of chronic obstructive pulmonary disease (COPD). COPD is characterized by chronic inflammation of the airways, imbalance of proteolytic activity resulting in the destruction of lung parenchyma, alveolar hypoxia, oxidative stress, and apoptosis. Sphingolipids are structural membrane components whose metabolism is altered during stress. Known as apoptosis and inflammation inducer, the sphingolipid ceramide was found to accumulate in COPD airways and its plasma concentration increased as well...
April 13, 2017: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/28407913/pyrroloquinoline-quinone-from-gluconobacter-oxydans-fermentation-broth-enhances-superoxide-anion-scavenging-capacity-of-cu-zn-sod
#14
Ke Ma, Jun-Zhu Cui, Jian-Bin Ye, Xian-Mei Hu, Ge-Li Ma, Xue-Peng Yang
A bioassay-guided fractionation of extract from Gluconobacter oxydans fermentation broth afforded Compound 1, which was identified as pyrroloquinoline quinone (PQQ) by spectroscopic methods. PQQ has been shown to enhance the superoxide anion-scavenging capacity significantly for Cu/Zn-SOD. To illustrate the mechanism, the interaction between PQQ and Cu/Zn-SOD was investigated. The multiple binding sites involving hydrogen bonds and van der Waals force between PQQ and Cu/Zn-SOD were revealed by isothermal titration calorimetry...
September 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28407542/diclofenac-degradation-in-water-by-feceox-catalyzed-h2o2-influencing-factors-mechanism-and-pathways
#15
Shan Chong, Guangming Zhang, Nan Zhang, Yucan Liu, Ting Huang, Huazhen Chang
The degradation of diclofenac in a like Fenton system, FeCeOx-H2O2, was studied in details. The influencing factors, reaction kinetics, reaction mechanism and degradation pathways of diclofenac were investigated. The optimum conditions were at a solution pH of 5.0, H2O2 concentration of 3.0mmol/L, diclofenac initial concentration of 0.07mmol/L, FeCeOx dosage of 0.5g/L, and 84% degradation of diclofenac was achieved within 40min. The kinetics of FeCeOx catalyzed H2O2 process involved adsorption-dominating and degradation-dominating stages and fitted pseudo-second order model and pseudo-first order model, respectively...
April 5, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28401997/neuroprotective-effects-of-phloretin-and-its-glycosylated-derivative-on-rotenone-induced-toxicity-in-human-sh-sy5y-neuronal-like-cells
#16
Davide Barreca, Monica Currò, Ersilia Bellocco, Silvana Ficarra, Giuseppina Laganà, Ester Tellone, Maria Laura Giunta, Giuseppa Visalli, Daniela Caccamo, Antonio Galtieri, Riccardo Ientile
Phloretin and phlorizin are the two strong natural antioxidants whose biological and pharmacological applications are rapidly growing in different human pathological conditions. The neuroprotective activity of the two flavonoids has been analyzed on cell culture of neuroblastoma cells. The neuroprotective activity of the two flavonoids has been analyzed on cell culture of neuroblastoma cells and evaluated by testing cell vitality, mitochondrial transmembrane potential and ROS production, antioxidant enzymes detection, activation of caspase 3, DNA damage, protein carbonylation, lipid peroxidation, and superoxide anion scavenging activity...
April 12, 2017: BioFactors
https://www.readbyqxmd.com/read/28398735/anti-inflammatory-flavan-3-ol-dihydroretrochalcones-from-daemonorops-draco
#17
Ping-Chung Kuo, Hsin-Yi Hung, Tsong-Long Hwang, Wen-Ke Du, Hsiang-Chih Ku, E-Jian Lee, Shih-Huang Tai, Fu-An Chen, Tian-Shung Wu
Four A-type flavan-3-ol-dihydroretrochalcone dimers, dragonins A-D (1-4), were characterized from the traditional Chinese medicine Sanguis Draconis. The structures of 1-4 were elucidated by spectroscopic and spectrometric analyses. Compounds 1 and 2 exhibited significant inhibition of fMLP/CB-induced superoxide anion and elastase. The signaling pathways accounting for the inhibitory effects of compound 2 were also elucidated. These purified A-type flavan-3-ol-dihydroretrochalcones are new potential leads for the development of anti-inflammatory drugs...
April 11, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28398002/alpha-ketoglutarate-curbs-differentiation-and-induces-cell-death-in-mesenchymal-stromal-precursors-with-mitochondrial-dysfunction
#18
Karmveer Singh, Linda Krug, Abhijit Basu, Patrick Meyer, Nicolai Treiber, Seppe Vander Beken, Meinhard Wlaschek, Stefan Kochanek, Wilhelm Bloch, Hartmut Geiger, Pallab Maity, Karin Scharffetter-Kochanek
Increased concentrations of reactive oxygen species (ROS) originating from dysfunctional mitochondria contribute to diverse aging-related degenerative disorders. But so far little is known about the impact of distinct ROS on metabolism and fate of stromal precursor cells. We here demonstrate that an increase in superoxide anion radicals due to superoxide dismutase 2 (Sod2) deficiency in stromal precursor cells suppress osteogenic and adipogenic differentiation through fundamental changes in the global metabolite landscape...
April 11, 2017: Stem Cells
https://www.readbyqxmd.com/read/28397812/upregulation-of-sestrins-protect-atriums-against-oxidative-damage-and-fibrosis-in-human-and-experimental-atrial-fibrillation
#19
Zengxiang Dong, Chaolan Lin, Yujiao Liu, Hongbo Jin, Hong Wu, Zhenjun Li, Liping Sun, Lu Zhang, Xi Hu, Yingying Wei, Chengcheng Wang, Wei Han
Atrial Fibrillation (AF) is common in the elderly and Sestrins (Sesns) have been suggested to prevent age-related pathologies. The aim of this study was to investigate the effects of Sesns in AF. Clinical data were collected and a small sample of atrial appendage and atrium was obtained from patients undergoing valve repairment. The expression of Sesn1, Sesn2, and Sesn3 was significantly higher in patients with permanent atrial fibrillation (PmAF) than that in sinus rhythm (SR), and further greater in the left atrium than the right in PmAF patients...
April 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28394410/nanotechnology-for-electroanalytical-biosensors-of-reactive-oxygen-and-nitrogen-species
#20
REVIEW
Rajesh Seenivasan, Charles Kolodziej, Chandran Karunakaran, Clemens Burda
Over the past several decades, nanotechnology has contributed to the progress of biomedicine, biomarker discovery, and the development of highly sensitive electroanalytical / electrochemical biosensors for in vitro and in vivo monitoring, and quantification of oxidative and nitrosative stress markers like reactive oxygen species (ROS) and reactive nitrogen species (RNS). A major source of ROS and RNS is oxidative stress in cells, which can cause many human diseases, including cancer. Therefore, the detection of local concentrations of ROS (e...
April 10, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
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