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Xanthine oxidase

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https://www.readbyqxmd.com/read/28229279/immune-dysfunction-and-increased-oxidative-stress-state-in-diet-induced-obese-mice-are-reverted-by-nutritional-supplementation-with-monounsaturated-and-n-3-polyunsaturated-fatty-acids
#1
Caroline Hunsche, Oskarina Hernandez, Alina Gheorghe, Ligia Esperanza Díaz, Ascensión Marcos, Mónica De la Fuente
PURPOSE: Obesity is associated with impaired immune defences and chronic low levels of inflammation and oxidation. In addition, this condition may lead to premature aging. The aim of the study was to evaluate the effects of a nutritional supplementation with monounsaturated and n-3 polyunsaturated fatty acids on several functions and oxidative stress parameters in peritoneal immune cells of obese mice, as well as on the life span of these animals. METHODS: Obesity was induced in adult female ICR/CD1 by the administration of a high-fat diet (HFD) for 14 weeks...
February 23, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28223196/conversion-to-purpurogallin-a-key-step-in-the-mechanism-of-the-potent-xanthine-oxidase-inhibitory-activity-of-pyrogallol
#2
Sari Honda, Yuya Fukuyama, Hisashi Nishiwaki, Akiko Masuda, Toshiya Masuda
In this study, the mechanism of the xanthine oxidase (XO) inhibitory activity of pyrogallol, the main inhibitor found in roasted coffee, was investigated. Pyrogallol was unstable and readily converted to purpurogallin in a pH 7.4 solution, a physiological model of human body fluids. The XO inhibitory activity of the produced purpurogallin was higher than that of pyrogallol, as evidenced by comparing their IC50 values (0.2 µmol L(-1) for purpurogallin, 1.6 µmol L(-1) for pyrogallol). The XO activity of pyrogallol was enhanced by pre-incubation in pH 7...
February 18, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28219711/oxidative-stress-inactivates-ecto-5-nucleotidase-by-inhibiting-protein-kinase-c-in-rat-hearts-in-vivo
#3
Toshio Obata, Michiko Nakashima
Examined in the present study, allopurinol are xanthine oxidase inhibitors for use in rat hearts in vivo dialysis technology and ventricular myocardial intersitial adenosine production can increase. The microdialysis probe was implanted in the left ventricular myocardium of anesthetized rat hearts and the tissue in the vicinity of the dialysis was perfused with Tyrode's solution containing adenosine 5'-monophosphate (AMP) through the dialysis probe at a rate of 1.0ml/min to assess the activity of ecto-5'-nucleotidase...
February 17, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28217311/xanthine-oxidase-inhibition-for-the-treatment-of-cardiovascular-disease-an-updated-systematic-review-and-meta-analysis
#4
Jufen Zhang, Riet Dierckx, Kevin Mohee, Andrew L Clark, John G Cleland
BACKGROUND: Previous studies have shown that xanthine oxidase inhibitors (XOI) might improve outcome for patients with cardiovascular disease. However, more evidence is required. METHODS AND RESULTS: We published a meta-analysis of trials conducted before 2014 examining the effects of XOI on mortality in patients with cardiovascular disease. At least two further trials (N = 323 patients) have since been published. Accordingly, we repeated our analysis after a further search for randomized controlled trials of XOI in PubMed/MEDLINE, EMBASE, and Cochrane Databases...
February 2017: ESC Heart Failure
https://www.readbyqxmd.com/read/28212445/long-term-effects-of-fetal-undernutrition-on-rat-heart-role-of-hypertension-and-oxidative-stress
#5
Pilar Rodríguez-Rodríguez, Angel L López de Pablo, Concha F García-Prieto, Beatriz Somoza, Begoña Quintana-Villamandos, José J Gómez de Diego, Perla Y Gutierrez-Arzapalo, David Ramiro-Cortijo, M Carmen González, Silvia M Arribas
BACKGROUND AND AIMS: Fetal undernutrition is a risk factor for heart disease in both genders, despite the protection of women against hypertension development. Using a rat model of maternal undernutrition (MUN) we aimed to assess possible sex differences in the development of cardiac alterations and the implication of hypertension and cardiac oxidative stress. METHODS: Male and female offspring from rats fed ad libitum (control) or with 50% of the normal daily intake during the second half of gestation (MUN) were used...
2017: PloS One
https://www.readbyqxmd.com/read/28210753/puerarin-7-o-glucuronide-a-water-soluble-puerarin-metabolite-prevents-angiotensin-ii-induced-cardiomyocyte-hypertrophy-by-reducing-oxidative-stress
#6
Ning Hou, Bin Cai, Cai-Wen Ou, Zhen-Hui Zhang, Xia-Wen Liu, Mu Yuan, Gan-Jian Zhao, Shi-Ming Liu, Long-Gen Xiong, Jian-Dong Luo, Cheng-Feng Luo, Min-Sheng Chen
This study aimed to investigate the anti-oxidant and anti-hypertrophic effects of puerarin-7-O-glucuronide, a water-soluble puerarin metabolite. The anti-oxidant effects of puerarin-7-O-glucuronide were assessed by measurement of intracellular superoxide levels, total superoxide dismutase (SOD) activity, total anti-oxidant capacity, and glutathione (GSH)/glutathione disulfide (GSSG) ratio in cultured neonatal rat cardiomyocytes (NRCMs) stimulated with the xanthine oxidase (XO)/xanthine (X) system or angiotensin II...
February 16, 2017: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/28209797/roles-of-vascular-oxidative-stress-and-nitric-oxide-in-the-pathogenesis-of-atherosclerosis
#7
REVIEW
Ulrich Förstermann, Ning Xia, Huige Li
Major reactive oxygen species (ROS)-producing systems in vascular wall include NADPH (reduced form of nicotinamide adenine dinucleotide phosphate) oxidase, xanthine oxidase, the mitochondrial electron transport chain, and uncoupled endothelial nitric oxide (NO) synthase. ROS at moderate concentrations have important signaling roles under physiological conditions. Excessive or sustained ROS production, however, when exceeding the available antioxidant defense systems, leads to oxidative stress. Animal studies have provided compelling evidence demonstrating the roles of vascular oxidative stress and NO in atherosclerosis...
February 17, 2017: Circulation Research
https://www.readbyqxmd.com/read/28209096/increased-oxidative-stress-alters-nucleosides-metabolite-levels-in-sickle-cell-anemia
#8
Lívia Gelain Castilhos, Juliana Sorraila de Oliveira, Stephen Adeniyi Adefegha, Luana Pereira Magni, Pedro Henrique Doleski, Fatima Husein Abdalla, Cínthia Melazzo de Andrade, Daniela Bitencourt Rosa Leal
OBJECTIVES: This study was conducted to assess the markers of oxidative stress, myeloperoxidase (MPO), acetylcholinesterase (AChE) and xanthine oxidase (XO) activities as well as the levels of nucleotide metabolites in sickle cell anemia (SCA) patients. METHODS: Fifteen SCA treated patients and 30 health subjects (control group) were selected. The markers of oxidative stress (levels of reactive oxygen species (ROS), plasma proteins, carbonyl content, lipid peroxidation (TBARS), total thiols (T-SH), glutathione and catalase activity), MPO, AChE and XO activities as well as the levels of nucleotide metabolites were measured in SCA patients...
February 16, 2017: Redox Report: Communications in Free Radical Research
https://www.readbyqxmd.com/read/28205317/oxidative-stress-and-immunosenescence-in-spleen-of-obese-mice-can-be-reversed-by-2-hydroxyoleic-acid
#9
Alina Gheorghe, Fátima Pérez de Heredia, Caroline Hunsche, Noemí Redondo, Ligia Esperanza Díaz, Oskarina Hernández, Ascensión Marcos, Mónica De la Fuente
We aimed to investigate the effects of obesity on oxidative stress and leukocyte function in spleen of mice, and to assess whether supplementation with 2-hydroxyoleic acid (2-OHOA) or n-3 polyunsaturated fatty acids (PUFA) could reverse those effects. Female ICR/CD1 mice (8 weeks old, n = 24) received an obesogenic diet (22% fat for 4 weeks and 60% fat for 14 weeks). After 6 weeks, mice were split in three groups (n = 8/group): no supplementation, 2-OHOA supplementation (1500 mg kg(-1) ) and n-3 PUFA supplementation (EPA + DHA, 3000 mg kg(-1) diet)...
February 15, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28193407/mechanism-of-action-and-interactions-between-xanthine-oxidase-inhibitors-derived-from-natural-sources-of-chlorogenic-and-ferulic-acids
#10
Urszula Gawlik-Dziki, Dariusz Dziki, Michał Świeca, Renata Nowak
The aim of this study was to estimate the phenolic composition and xanthine oxidase (XO) inhibitory activity of green coffee beans (GCB) and wholemeal wheat flour (WF). Additionally, the type and strength of interaction (expressed as the combination index, CI) and mode of XO inhibition were analyzed. The major phenolic in GCB was 5-caffeoylquinic acid (39.92mg/g dw). The main phenolic acids in WF were trans- and cis-ferulic acids (257 and 165.57mg/100g dw, respectively). Both ferulic and chlorogenic acids individually inhibited XO, and for their combination moderate synergism was found...
June 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28192760/competitive-binding-experiments-can-reduce-the-false-positive-results-of-affinity-based-ultrafiltration-hplc-a-case-study-for-identification-of-potent-xanthine-oxidase-inhibitors-from-perilla-frutescens-extract
#11
Zhiqiang Wang, Shin Hwa Kwon, Seung Hwan Hwang, Young-Hee Kang, Jae-Yong Lee, Soon Sung Lim
The purpose of this study was to assess the possibility of using competitive binding experiments with ultrafiltration-HPLC analysis to identify potent xanthine oxidase (XO) inhibitors from the Perilla frutescens extract as an attempt to reduce the number of false positive results. To isolate the enzyme-ligand complex from unbound compounds, the P. frutescens extract was either incubated in the absence of XO, in the presence of XO, or with the active site blocked XO before the ultrafiltration was performed. Allopurinaol was used as the XO active site blocker...
February 6, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28182789/puerarin-attenuates-cisplatin-induced-rat-nephrotoxicity-the-involvement-of-tlr4-nf-%C3%AE%C2%BAb-signaling-pathway
#12
Xu Ma, Lei Yan, Qing Zhu, Fengmin Shao
Puerarin was a major isoflavonoid derived from the Chinese medical herb radix puerariae (Gegen). In present study effect of puerarin on cisplatin nephrotoxicity was evaluated. Rat model of nephrotoxicity was established by a single intraperitoneal injection of cisplatin (7mg/kg). Puerarin was administrated through caudal vein injection once per day at the dose of 10mg/kg, 30mg/kg and 50mg/kg. Biochemical assays showed that after cisplatin treatment the serum urea and creatinine increased significantly compared with control (P<0...
2017: PloS One
https://www.readbyqxmd.com/read/28178612/dietary-soy-protein-improves-adipose-tissue-dysfunction-by-modulating-parameters-related-with-oxidative-stress-in-dyslipidemic-insulin-resistant-rats
#13
Paola G Illesca, Silvina M Álvarez, Dante A Selenscig, María Del R Ferreira, María S Giménez, Yolanda B Lombardo, María E D'Alessandro
The present study investigates the benefits of the dietary intake of soy protein on adipose tissue dysfunction in a rat model that mimics several aspects of the human metabolic syndrome. Wistar rats were fed a sucrose-rich diet (SRD) for 4 months. After that, half of the animals continued with SRD until month 8 while in the other half, casein protein was replaced by isolated soy protein for 4 months (SRD-S). A reference group consumed a control diet all the time. In adipose tissue we determined: i) the activities of antioxidant enzymes, gene expression of Mn-superoxide dismutase (SOD) and glutathione peroxidase (GPx), and glutathione redox state ii) the activity of xanthine oxidase (XO), ROS levels and the gene expression of NAD(P)H oxidase iii) the expression of the nuclear factor erythroid-2 related factor-2 (Nrf2)...
February 5, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28170236/protonation-and-sulfido-versus-oxo-ligation-changes-at-the-molybdenum-cofactor-in-xanthine-dehydrogenase-xdh-variants-studied-by-x-ray-absorption-spectroscopy
#14
Stefan Reschke, Stefan Mebs, Kajsa G V Sigfridsson-Clauss, Ramona Kositzki, Silke Leimkühler, Michael Haumann
Enzymes of the xanthine oxidase family are among the best characterized mononuclear molybdenum enzymes. Open questions about their mechanism of transfer of an oxygen atom to the substrate remain. The enzymes share a molybdenum cofactor (Moco) with the metal ion binding a molybdopterin (MPT) molecule via its dithiolene function and terminal sulfur and oxygen groups. For xanthine dehydrogenase (XDH) from the bacterium Rhodobacter capsulatus, we used X-ray absorption spectroscopy to determine the Mo site structure, its changes in a pH range of 5-10, and the influence of amino acids (Glu730 and Gln179) close to Moco in wild-type (WT), Q179A, and E730A variants, complemented by enzyme kinetics and quantum chemical studies...
February 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28167361/synthesis-characterization-and-xanthine-oxidase-inhibition-of-cu-ii-chrysin-complex
#15
Suyun Lin, Li Zeng, Guowen Zhang, Yijing Liao, Deming Gong
Xanthine oxidase (XO) is a key enzyme catalyzing hypoxanthine to xanthine and then uric acid causing hyperuricemia. A Cu(II) complex of chrysin was synthesized and characterized by UV-vis absorption, Fourier transform infrared, nuclear magnetic resonance ((1)H NMR) and mass spectroscopy studies. The interaction of Cu(II)-complex with XO was investigated by spectroscopic methods and molecular simulation. The Cu(II)-chrysin complex exhibited a better inhibitory ability (IC50=0.82±0.034μM) against XO than its corresponding ligands chrysin and Cu(2+) in a mix-competitive manner...
January 31, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28166443/aldehyde-oxidase-dependent-species-difference-in-hepatic-metabolism-of-fasudil-to-hydroxyfasudil
#16
Zhengsheng Mao, Yali Wu, Qiuying Li, Xin Wang, Youping Liu, Xin Di
1. An investigation on the metabolic mechanism of fasudil to hydroxyfasudil was conducted in vitro using liver subcellular fractions of different species. Hydroxyfasudil was generated in large amounts by male rat liver S9 and to a similar extent by human liver S9 but was not detected in dog liver S9 incubations. 2. Studies with various molybdenum hydroxylase inhibitors demonstrated that aldehyde oxidase (AO), but not xanthine oxidase (XO), selectively catalyzed fasudil to hydroxyfasudil in both rat and human liver cytosol...
February 6, 2017: Xenobiotica; the Fate of Foreign Compounds in Biological Systems
https://www.readbyqxmd.com/read/28163535/lesinurad-a-significant-advancement-or-just-another-addition-to-existing-therapies-of-gout
#17
REVIEW
Ajay Gupta, Pramod Kumar Sharma, Arup Kumar Misra, Surjit Singh
Gout is a metabolic disorder that usually presents as recurrent episodes of acute arthritis due to deposition of crystals in joints and cartilages. Despite the availability of several drugs for gout, its management is still less than adequate. There is always a search for newer, safer, and more potent urate-lowering therapies for treating patients inadequately controlled with available drugs. Lesinurad in combination with a xanthine oxidase inhibitor provides an effective mode of therapy in the management of hyperuricemia associated with gout...
October 2016: Journal of Pharmacology & Pharmacotherapeutics
https://www.readbyqxmd.com/read/28148582/gout-a-guide-for-the-general-and-acute-physicians
#18
Abhishek Abhishek, Edward Roddy, Michael Doherty
Gout is the most prevalent inflammatory arthritis and affects 2.5% of the general population in the UK. It is also the only arthritis that has the potential to be cured with safe, inexpensive and well tolerated urate-lowering treatments, which reduce serum uric acid by either inhibiting xanthine oxidase - eg allopurinol, febuxostat - or by increasing the renal excretion of uric acid. Of these, xanthine oxidase inhibitors are used first line and are effective in 'curing' gout in the vast majority of patients...
February 2017: Clinical Medicine: Journal of the Royal College of Physicians of London
https://www.readbyqxmd.com/read/28133790/2-benzamido-4-methylthiazole-5-carboxylic-acid-derivatives-as-potential-xanthine-oxidase-inhibitors-and-free-radical-scavengers
#19
Md Rahmat Ali, Suresh Kumar, Obaid Afzal, Nishtha Shalmali, Wazid Ali, Manju Sharma, Sandhya Bawa
The new chemical entities febuxostat and topiroxostat have been approved by the US Food and Drug Administration, opening new avenues for exploiting different heterocycles other than purines as xanthine oxidase (XO) inhibitors. A different series of substituted 2-benzamido-4-methylthiazole-5-carboxylic acid derivatives (5a-r) was synthesized and characterized by the collective use of IR, (1) H and (13) C NMR, and mass spectroscopy, for the treatment of gout and hyperuricemia. In vitro studies of the synthesized derivatives revealed that the presence of a fluoro group at the para position in 5b (IC50  = 0...
January 30, 2017: Archiv der Pharmazie
https://www.readbyqxmd.com/read/28131711/discovery-and-biological-evaluation-of-some-1h-1-2-3-triazol-4-yl-methoxybenzaldehyde-derivatives-containing-an-anthraquinone-moiety-as-potent-xanthine-oxidase-inhibitors
#20
Ting-Jian Zhang, Song-Ye Li, Wei-Yan Yuan, Qing-Xia Wu, Lin Wang, Su Yang, Qi Sun, Fan-Hao Meng
A series of (1H-1,2,3-triazol-4-yl)methoxybenzaldehyde derivatives containing an anthraquinone moiety were synthesized and identified as novel xanthine oxidase inhibitors. Among them, the most promising compounds 1h and 1k were obtained with IC50 values of 0.6μM and 0.8μM, respectively, which were more than 10-fold potent compared with allopurinol. The Lineweaver-Burk plot revealed that compound 1h acted as a mixed-type xanthine oxidase inhibitor. SAR analysis showed that the benzaldehyde moiety played a more important role than the anthraquinone moiety for inhibition potency...
January 16, 2017: Bioorganic & Medicinal Chemistry Letters
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