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Superoxide anion

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https://www.readbyqxmd.com/read/29165865/mimicking-class-ib-mn2-ribonucleotide-reductase-a-mnii2-complex-and-its-reaction-with-superoxide
#1
Adriana Magherusan, Ang Zhou, Erik Farquhar, Max Garcia Melchor, Brendan Twamley, Lawrence Que, Aidan Richard McDonald
Class Ib RNRs require superoxide anion (O2*-), rather than dioxygen (O2), to access a high-valent Mn2 oxidant. Complex 1 ([Mn2(O2CCH3)(N-Et-HPTB)](ClO4)2, N-Et-HPTB = N,N,N',N'-tetrakis(2-(1-ethylbenzimidazolyl))-2-hydroxy-1,3-diaminopropane) was synthesised in high yield (90%). 1 was reacted with O2*- at -40 °C resulting in the formation of a metastable species (2). 2 displayed electronic absorption features (λmax = 460, 610 nm) typical of a Mn-peroxide species, and a 29 line EPR signal typical of a MnIIMnIII entity...
November 22, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29165388/argan-oil-as-an-effective-nutri-therapeutic-agent-in-metabolic-syndrome-a-preclinical-study
#2
Adil El Midaoui, Youssef Haddad, Younes Filali-Zegzouti, Réjean Couture
The present study aims at examining the effects of argan oil on the three main cardiovascular risk factors associated with metabolic syndrome (hypertension, insulin resistance and obesity) and on one of its main complications, neuropathic pain. Male Sprague-Dawley rats had free access to a drinking solution containing 10% d-glucose or tap water for 12 weeks. The effect of argan oil was compared to that of corn oil given daily by gavage during 12 weeks in glucose-fed rats. Glucose-fed rats showed increases in systolic blood pressure, epididymal fat, plasma levels of triglycerides, leptin, glucose and insulin, insulin resistance, tactile and cold allodynia in association with a rise in superoxide anion production and NADPH oxidase activity in the thoracic aorta, epididymal fat and gastrocnemius muscle...
November 22, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29163205/localization-and-interaction-between-kinin-b1-receptor-and-nadph-oxidase-in-the-vascular-system-of-diabetic-rats
#3
Youssef Haddad, Réjean Couture
Kinin B1 receptor (B1R) enhanced superoxide anion ([Formula: see text]) production in the vasculature of diabetic rats. This study investigates the induction and distribution of B1R in diabetic blood vessels and addresses the hypothesis that B1R is co-localized with NADPH oxidase (NOX1 and NOX2) and produces its activation via protein kinase C (PKC). Diabetes was induced in rats with streptozotocin (STZ 65 mg.kg(-1), i.p.). Two weeks later, the production of [Formula: see text] was measured in aorta rings in response to the B1R agonist (Sar[D-Phe(8)]-des-Arg(9)-BK, 20 μM) by the method of lucigenin-enhanced chemiluminescence...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29162483/altered-expression-of-cxcr1-il-8r-in-macrophages-utilizing-cell-surface-tnfr1-and-il-1-receptor-during-staphylococcus-aureus-infection
#4
Biswadev Bishayi, Rana Adhikary, Sahin Sultana, Rajen Dey, Ajeya Nandi
Currently, very few studies are available on the expression of CXCR1 in mouse macrophages having both intact TNFR1 and IL-1R or their deficiency in relation to acute S. aureus infection. Peritoneal macrophages from mice neutralized singly for TNFR1or IL-1R, or for both TNFR1 and IL-1R were infected with S. aureus in vitro and their ability to secrete cytokines and reactive oxygen species (ROS) were determined. It was observed that the release TNF-α and IL-1β in response to S. aureus infection was decreased in macrophages when both TNFR1 and IL-1R were neutralized...
November 18, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29156213/hocl-and-the-control-of-oncogenesis
#5
REVIEW
Georg Bauer
Sustained generation of extracellular superoxide anions by membrane-associated NADPH oxidase-1 is a hallmark of malignant transformation. The resulting H2O2 drives the proliferation of malignant cells and is converted to HOCl by a Dual oxidase-related peroxidase domain that acts analogously to myeloperoxidase. Whereas H2O2 induces apoptosis nonselectively in nontransformed and transformed cells, HOCl selectively affects malignant cells, as the interaction between HOCl and extracellular superoxide anions allows for site-specific generation of apoptosis-inducing hydroxyl radicals...
November 10, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/29155872/sulfur-dioxide-alleviates-programmed-cell-death-in-barley-aleurone-by-acting-as-an-antioxidant
#6
Sha-Sha Wang, Ying-Xin Zhang, Feng Yang, Zhong-Qin Huang, Jun Tang, Kang-Di Hu, Hua Zhang
Sulfur dioxide (SO2), a gaseous signaling molecule in animal cells, has recently been found to play a physiological role in plants. Here we studied the role of SO2 in gibberellic acid (GA3)-induced programmed cell death (PCD) in barley (Hordeum vulgare L.) aleurone layers. The application of the SO2 donor (NaHSO3/Na2SO3, 1:3 M/M) effectively alleviated PCD in barley aleurone layers in a dose-dependent manner with an optimal concentration of 50 μM. Further investigations showed that SO2 reduced the accumulation of hydrogen peroxide (H2O2), superoxide anion (⋅O2-) and malondialdehyde (MDA) in aleurone layers...
2017: PloS One
https://www.readbyqxmd.com/read/29154739/oxidative-stress-induced-inflammatory-responses-and-effects-of-n-acetylcysteine-in-bovine-mammary-alveolar-cells
#7
Hyojin Bae, Chang Hee Jeong, Wei Nee Cheng, Kwonho Hong, Han Geuk Seo, Sung Gu Han
Bovine mastitis, an inflammation of the udder, results in reduced milk production and poor milk quality. Mastitis is usually, but not always, a response to pathogen infection. High milk yield can produce oxidative stress in the mammary tissue. High milk yield is also known to be associated with bovine mastitis. Thus, in the current study, we hypothesised that oxidative stress increases inflammatory responses in bovine mammary cells. To examine the hypothesis, we produced cellular oxidative stress and investigated resulting inflammatory responses in bovine mammary alveolar cells (MAC-T)...
November 2017: Journal of Dairy Research
https://www.readbyqxmd.com/read/29154193/fundamentals-on-the-biochemistry-of-peroxynitrite-and-protein-tyrosine-nitration
#8
REVIEW
Silvina Bartesaghi, Rafael Radi
In this review we provide an analysis of the biochemistry of peroxynitrite and tyrosine nitration. Peroxynitrite is the product of the diffusion-controlled reaction between superoxide (O2(•)(-)) and nitric oxide ((•)NO). This process is in competition with the enzymatic dismutation of O2(•-) and the diffusion of (•)NO across cells and tissues and its reaction with molecular targets (e.g. guanylate cyclase). Understanding the kinetics and compartmentalization of the O2(•-) / (•)NO interplay is critical to rationalize the shift of (•)NO from a physiological mediator to a cytotoxic intermediate...
September 19, 2017: Redox Biology
https://www.readbyqxmd.com/read/29150709/simultaneous-detection-of-nadph-consumption-and-h2o2-production-using-the-ampliflu%C3%A2-red-assay-for-screening-of-p450-activities-and-uncoupling
#9
Lisa K Morlock, Dominique Böttcher, Uwe T Bornscheuer
Cytochrome P450s belong to a large and diverse group of heme-containing enzymes. These monooxygenases catalyze the incorporation of a single atom of molecular oxygen into their substrate. In contrast to most other enzymes, the activity of P450 enzymes is not only dependent on substrate and cofactor availability and reaction conditions, but also depends on the coupling efficiency of the catalytic cycle itself. Through the electron transfer from NAD(P)H to the heme-center of the P450, the enzyme becomes activated and binds oxygen...
November 17, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29147100/purification-and-identification-of-a-natural-antioxidant-protein-from-fertilized-eggs
#10
Shaohua Yang, Lulu Wang, Ying Wang, Xiaoqian Ou, Zhaoyuan Shi, Chongchong Lu, Wei Wang, Guoqing Liu
Fertilized hen eggs are rich in a variety of bioactive ingredients. In this study, we aimed to obtain an antioxidant protein from fertilized eggs and the radical scavenging abilities on 1, 1-diphenyl-2-picrylhydrazyl (DPPH), hydroxyl radical (•OH), superoxide anion (O(2-)•) were used to evaluate the antioxidant activity of the purified protein. During 20 d of incubation, the radical scavenging ability of protein extracted from fertilized eggs exhibited significantly differences and the protein on day 16 showed higher antioxidant capacity...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/29146596/structure-and-function-of-the-leptospira-interrogans-peroxide-stress-regulator-perr-an-atypical-perr-devoid-of-a-structural-metal-binding-site
#11
Mounira Kebouchi, Frederick Saul, Raleb Taher, Annie Landier, Benedicte Beaudeau, Sarah Dubrac, Patrick Weber, Ahmed Haouz, Mathieu Picardeau, Nadia Benaroudj
Peroxide sensing is essential for bacteria survival during aerobic metabolism and host infection. Peroxide stress regulators (PerRs) are homodimeric transcriptional repressors with each monomer typically containing both structural and regulatory metal-binding sites. PerR binding to gene promoters is controlled by the presence of iron in the regulatory site, and iron-catalyzed oxidation of PerR by H2O2 leads to the dissociation of PerR from DNA. In addition to a regulatory metal, most PerRs require a structural metal for proper dimeric assembly...
November 16, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29145191/antioxidants-maintain-cellular-redox-homeostasis-by-elimination-of-reactive-oxygen-species
#12
Long He, Ting He, Shabnam Farrar, Linbao Ji, Tianyi Liu, Xi Ma
Reactive oxygen species (ROS) are produced by living cells as normal cellular metabolic byproduct. Under excessive stress conditions, cells will produce numerous ROS, and the living organisms eventually evolve series of response mechanisms to adapt to the ROS exposure as well as utilize it as the signaling molecules. ROS molecules would trigger oxidative stress in a feedback mechanism involving many biological processes, such as apoptosis, necrosis and autophagy. Growing evidences have suggested that ROS play a critical role as the signaling molecules throughout the entire cell death pathway...
November 17, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29144773/cancer-chemopreventive-antiproliferative-and-superoxide-anion-scavenging-properties-of-kluyveromyces-marxianus-and-saccharomyces-cerevisiae-var-boulardii-cell-wall-components
#13
Olivier Fortin, Blanca Aguilar-Uscanga, Khanh Dang Vu, Stephane Salmieri, Monique Lacroix
This study investigated the cancer chemopreventive, the antiradical, and the antiproliferative properties of polysaccharides extracts from cell wall of Saccharomyces boulardii and Kluyveromyces marxianus. β-glucan, mannan, and chitin were also quantified to identify the most important extract responsible for these biological properties. Soluble and insoluble glucans as well as mannoprotein were extracted from cell wall using single hot-alkaline method. Superoxide anion scavenging (antiradical capacity), NAD(P)H: quinone reductase (QR) (EC 1...
November 16, 2017: Nutrition and Cancer
https://www.readbyqxmd.com/read/29144009/immobilization-of-superoxide-dismutase-on-polyelectrolyte-functionalized-titania-nanosheets
#14
Paul Rouster, Marko Pavlovic, Istvan Szilagyi
Superoxide dismutase (SOD) enzyme was successfully immobilized on titania nanosheets (TNS) functionalized with poly(diallyldimethylammonium chloride) (PDADMAC) polyelectrolyte. The TNS-PDADMAC solid support was prepared by hydrothermal synthesis followed by self-assembled polyelectrolyte layer formation. It was found that the SOD strongly adsorbed on the oppositely charged TNS-PDADMAC through electrostatic and hydrophobic interactions. The TNS-PDADMAC-SOD material was characterized by light scattering and microscopy techniques...
November 16, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/29143938/short-hairpin-rna-interference-targeting-interleukin-1-receptor-type-i-in-the-paraventricular-nucleus-attenuates-hypertension-in-rats
#15
Peng Lu, Shu-Jun Jiang, Hong Pan, Ai-Li Xu, Gui-Hua Wang, Chun-Lei Ma, Zhen Shi
Blood pressure is controlled by tonic sympathetic activities, excessive activation of which contributes to the pathogenesis and progression of hypertension. Interleukin (IL)-1β in the paraventricular nucleus (PVN) is involved in sympathetic overdrive and hypertension. Here, we investigated the therapeutic effects of IL-1 receptor type I (IL-1R1) gene silencing in the PVN on hypertension. Recombinant lentivirus vectors expressing a short hairpin RNA (shRNA) targeting IL-1R1 (Lv-shR-IL-1R1) or a control shRNA were microinjected into PVN of spontaneously hypertensive rats (SHRs) and normotensive WKY rats...
November 16, 2017: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/29143242/comparing-reactive-oxygen-species-and-dna-fragmentation-in-semen-samples-of-unexplained-infertile-and-healthy-fertile-men
#16
Zahra Zandieh, Akram Vatannejad, Mahmood Doosti, Sara Zabihzadeh, Mahnaz Haddadi, Leila Bajelan, Batool Rashidi, Saeid Amanpour
BACKGROUND: Male factor infertility has increased to more than 40% during the last decade. About 30% of these couples are diagnosed with unexplained infertility. In fact, reactive oxygen species (ROS), especially superoxide anion (O2(-)·) and hydrogen peroxide (H2O2), play a crucial role in regulation of physiological and pathological processes in spermatozoa. Moreover, since the diagnosis of unexplained infertility just through semen analysis is a matter of much controversy; we aimed to evaluate the levels of ROS and sperm DNA fragmentation in the semen samples of unexplained infertile and fertile control couples...
November 15, 2017: Irish Journal of Medical Science
https://www.readbyqxmd.com/read/29142401/phytochemical-compositions-and-in-vitro-assessments-of-antioxidant-and-antidiabetic-potentials-of-fractions-from-ehretia-cymosa-thonn
#17
Akintayo Ogundajo, Anofi Tom Ashafa
Background: Ehretia cymosa Thonn. is a popular medicinal plant used in different parts of West Africa for the treatment of various ailments including diabetes mellitus. Objective: The current study investigates bioactive constituents and in vitro antioxidant and antidiabetic potentials of fractions from extract of E. cymosa. Materials and Methods: Phytochemical investigation and antioxidant assays were carried out using standard procedures...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142208/transient-increases-in-intracellular-calcium-and-reactive-oxygen-species-levels-in-tcam-2-cells-exposed-to-microgravity
#18
C Morabito, S Guarnieri, A Catizone, C Schiraldi, G Ricci, M A Mariggiò
The effects of microgravity on functions of the human body are well described, including alterations in the male and female reproductive systems. In the present study, TCam-2 cells, which are considered a good model of mitotically active male germ cells, were used to investigate intracellular signalling and cell metabolism during exposure to simulated microgravity, a condition that affects cell shape and cytoskeletal architecture. After a 24 hour exposure to simulated microgravity, TCam-2 cells showed 1) a decreased proliferation rate and a delay in cell cycle progression, 2) increased anaerobic metabolism accompanied by increased levels of intracellular Ca(2+), reactive oxygen species and superoxide anion and modifications in mitochondrial morphology...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29141467/oxidative-stress-biomarkers-in-amniotic-fluid-of-pregnant-women-with-hypothyroidism
#19
Tanja R Novakovic, Zana C Dolicanin, Natasa Z Djordjevic
PURPOSE: Hypothyroidism in pregnancy is the serious state that may lead to fetal morbidity and mortality. Oxidative stress biomarkers in the amniotic fluid can provide important information on the health, development and maturation of the fetus during pregnancy. In this study, we examined whether maternal hypothyroidism contributes to increased oxidative stress biomarkers in the amniotic fluid during the first trimester of pregnancy. MATERIALS AND METHODS: The study was conducted on healthy pregnant women and pregnant women with hypothyroidism (gestational age: 16-18 weeks)...
November 15, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/29136588/a-facile-way-to-fabricate-manganese-phosphate-self-assembled-carbon-networks-as-efficient-electrochemical-catalysts-for-real-time-monitoring-of-superoxide-anions-released-from-hepg2-cells
#20
Xuan Cai, Libo Shi, Wenqian Sun, Hongli Zhao, Hong Li, Haiyan He, Minbo Lan
Quantification of superoxide anions (O2(•-)) is significant in the monitoring of many serious diseases and the design of enzyme-mimic catalysts plays the main role in the development of non-enzymatic O2(•-) sensors. Herein, we proposed a facile self-assembly process to synthesize manganese phosphate modified carbon networks using three kinds of widely-used carbon materials (MWCNTs, NGS and GO) as pillar connectors. Characterizations demonstrate that manganese phosphate is widely dispersed inside and on the surface of carbon networks without visible morphology...
November 6, 2017: Biosensors & Bioelectronics
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