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Uric acid antioxidant

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https://www.readbyqxmd.com/read/28937257/uric-acid-contributes-greatly-to-hepatic-antioxidant-capacity-besides-protein
#1
T Mikami, M Sorimachi
Uric acid is the end-product of purine nucleotide metabolism and an increase in uric acid concentration in the body results in hyperuricemia, ultimately leading to gout. However, uric acid is a potent antioxidant and interacts with reactive oxygen species (ROS) to be non-enzymatically converted to allantoin. Uric acid accounts for approximately 60% of antioxidant capacity in the plasma; however, its contribution to tissue antioxidant capacity is unknown. In this study, the contribution of uric acid to tissue antioxidant capacity and its conversion to allantoin by scavenging ROS in tissue were examined...
September 22, 2017: Physiological Research
https://www.readbyqxmd.com/read/28933745/effects-of-six-week-ginkgo-biloba-supplementation-on-aerobic-performance-blood-pro-antioxidant-balance-and-serum-brain-derived-neurotrophic-factor-in-physically-active-men
#2
Ewa Sadowska-Krępa, Barbara Kłapcińska, Ilona Pokora, Przemysław Domaszewski, Katarzyna Kempa, Tomasz Podgórski
Extracts of Ginkgo biloba leaves, a natural source of flavonoids and polyphenolic compounds, are commonly used as therapeutic agents for the improvement of both cognitive and physiological performance. The present study was aimed to test the effects of a six-week supplementation with 160 mg/day of a standardized extract of Ginkgo biloba or a matching placebo on aerobic performance, blood antioxidant capacity, and brain-derived neurotrophic factor (BDNF) level in healthy, physically active young men, randomly allocated to two groups (n = 9 each)...
July 26, 2017: Nutrients
https://www.readbyqxmd.com/read/28926744/chronic-high-protein-diet-induces-oxidative-stress-and-alters-the-salivary-gland-function-in-rats
#3
Urszula Kołodziej, Mateusz Maciejczyk, Wiesława Niklińska, Danuta Waszkiel, Małgorzata Żendzian-Piotrowska, Piotr Żukowski, Anna Zalewska
OBJECTIVE: Chronic high protein intake leads to an increase in reactive oxygen species (ROS) generation. However, there is no data on the impact of high-protein diet on the antioxidant barrier, oxidative stress and secretory function in the salivary glands of healthy individuals. DESIGN: 16 male Wistar rats were randomly divided into 2 groups (n=8): normal protein (C) and high-protein diet (HP) for 8 weeks. Salivary antioxidants: peroxidase (Px), catalase (CAT), superoxide dismutase 1 (SOD 1), uric acid (UA), total antioxidant status (TAS), total oxidant status (TOS) and the oxidative stress index (OSI), as well as protein carbonyls (PC), 4-hydroxynonenal protein adduct (4-HNE protein adduct), 8-isoprostanes (8-isoP), 8-hydroxy-2'-deoxyguanosine (8-OHdG) and protein content were determined in the salivary glands and plasma...
September 10, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28923478/reduction-of-non-enzymatic-antioxidants-in-plasma-during-ecmo-treatment-in-ards-by-influence-a-h1n1
#4
Marco Ciapetti, Paola Mancinelli, Andrea Cecchi, Emma Borrelli, Velio Bocci, Adriano Peris
PURPOSE: In critically ill patient it is observed a severe oxidative stress, not only due to the acute pathology but also for some therapeutic treatments. The aim of the present study was to analyze the variations of non-enzymatic antioxidants in plasma during veno-venous ECMO-treatment in a homogeneous population of critical patients with ARDS. MATERIALS AND METHODS: We carried out a retrospective study enrolling all patients with ARDS by influence A H1N1 treated with veno-venous ECMO...
August 8, 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/28922153/sex-dependent-associations-of-serum-uric-acid-with-brain-function-during-aging
#5
Alexandra M Kueider, Yang An, Toshiko Tanaka, Melissa H Kitner-Triolo, Stephanie Studenski, Luigi Ferrucci, Madhav Thambisetty
Serum uric acid (SUA) is an abundant natural antioxidant which could reduce the burden of cellular oxidation, a major cause of neurodegenerative disease. In line with this, SUA levels are lower in those with Alzheimer's disease; however, the association between SUA and cognition remains unclear. Results from studies examining the effects of SUA on cognition may be difficult to interpret in the context of normal versus pathological aging. This study examined sex-specific associations of baseline SUA with cognition during aging...
September 8, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28917195/uric-acid-in-major-depressive-and-anxiety-disorders
#6
Catherine N Black, Mariska Bot, Peter G Scheffer, Harold Snieder, Brenda W J H Penninx
BACKGROUND: Uric acid has neuroprotective effects, owing to its antioxidant properties. Lowered antioxidant capacity, causing increased oxidative stress, may be involved in affective disorders and might be altered by antidepressants. This study investigated the association of plasma uric acid, the greatest contributor to blood antioxidant capacity, with major depressive disorder (MDD) and anxiety disorders. METHODS: Data were from the Netherlands Study of Depression and Anxiety including patients with current (N = 1648), remitted (N = 609) MDD and/or anxiety disorders (of which N = 710 antidepressant users) and 618 controls...
September 6, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28911689/effect-of-oleuropein-against-chemotherapy-drug-induced-histological-changes-oxidative-stress-and-dna-damages-in-rat-kidney-injury
#7
Fatime Geyikoglu, Murat Emir, Suat Colak, Kubra Koc, Hasan Turkez, Murat Bakir, Mirkhalil Hosseinigouzdagani, Salim Cerig, Osman Nuri Keles, Nihal Simsek Ozek
Cisplatin-based chemotherapy is responsible for a large number of renal failures, and it is still associated with high rates of mortality today. Oleuropein (OLE) presents a plethora of pharmacological beneficial properties. In this study we investigated whether OLE could provide sufficient protection against cisplatin-induced nephrotoxicity. With this aim, Sprague-Dawley rats were divided into eight groups: control; 7 mg/kg/d cisplatin, 50 mg/kg, 100 mg/kg, and 200 mg/kg OLE; and treatment with OLE for 3 days starting at 24 hours following cisplatin injection...
April 2017: Journal of Food and Drug Analysis
https://www.readbyqxmd.com/read/28911644/nephroprotective-effect-of-paeonia-emodi-via-inhibition-of-advanced-glycation-end-products-and-oxidative-stress-in-streptozotocin-nicotinamide-induced-diabetic-nephropathy
#8
Lalit Kishore, Navpreet Kaur, Randhir Singh
The present study aimed to evaluate the effect of alcohol (PA) and hydroalcohol (PHA) extract of Paeonia emodi Royale roots in treatment of streptozotocin-nicotinamide induced diabetic nephropathy. Diabetes mellitus was induced in male Wistar rats by streptozotocin (65 mg/kg intraperitoneally) 15 minutes after nicotinamide (230 mg/kg, intraperitoneally) administration and diabetic nephropathy was assessed by measuring serum glucose, renal parameters (urea, uric acid, creatinine, and blood urea nitrogen level) and lipid profile...
July 2017: Journal of Food and Drug Analysis
https://www.readbyqxmd.com/read/28901421/uric-acid-induces-the-expression-of-tnf%C3%A2-%C3%AE-via-the-ros%C3%A2-mapk%C3%A2-nf%C3%A2-%C3%AE%C2%BAb-signaling-pathway-in-rat-vascular-smooth-muscle-cells
#9
Lirong Tang, Yu'e Xu, Ying Wei, Xu He
Hyperuricemia and artery atherosclerosis are closely associated and, as a classic inflammatory biomarker, tumor necrosis factor‑α (TNF‑α) has a direct role in atherogenesis. In the present study, it was demonstrated that uric acid was capable of inducing the generation of TNF‑α in vascular smooth muscle cells (VSMCs). The expression levels of proteins were detected using enzyme‑linked immunosorbent assays and western blot analysis. The expression levels of mRNAs were determined using reverse transcription‑quantitative polymerase chain reaction analysis, and superoxide anion levels were detected using a fluorescence microscope...
August 31, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28880688/neonatal-rat-age-sex-and-strain-modify-acute-antioxidant-response-to-ozone
#10
Janice A Dye, Eugene A Gibbs-Flournoy, Judy H Richards, Joel Norwood, Katherine Kraft, Gary E Hatch
Chronic obstructive pulmonary disease (COPD) is the third leading cause of death in the US and its impact continues to increase in women. Oxidant insults during critical periods of early life appear to increase risk of COPD through-out the life course. To better understand susceptibility to early life exposure to oxidant air pollutants we used Fisher (F344), Sprague-Dawley (SD) and Wistar (WIS) male and female neonatal rat pups to assess: (A) if strain (i.e. genetics), sex, or stage of early life development affected baseline lung antioxidant or redox enzyme levels and (B) if these same factors modulated antioxidant responsiveness to acute ozone exposure (1 ppm × 2 h) on post-natal day (PND) 14, 21, or 28...
September 7, 2017: Inhalation Toxicology
https://www.readbyqxmd.com/read/28875714/effects-of-co-exposure-to-imidacloprid-and-gibberellic-acid-on-redox-status-kidney-variables-and-histopathology-in-adult-rats
#11
Bornia Lafi, Mariem Chaâbane, Awatef Elwej, Malek Grati, Kamel Jamoussi, Hela Mnif, Tahia Boudawara, Hanen Ketata Bouaziz, Najiba Zeghal
Data on the individual nephrotoxic effects of imidacloprid (IMI) and gibberellic acid (GA3) are scarce. Moreover, there is a lack of information about their combined effects on the renal tissue. Our study investigated the effects of IMI and GA3 separately or together on rats kidney. IMI (64 mg/kg bw) was given for 3 weeks by gavage either individually or in combination with GA3 (200 mg/L) via drinking water. IMI associated or no with GA3 increased the levels of kidney malondialdehyde, advanced oxidation protein products, protein carbonyls and metallothionein, plasma creatinine, urea, blood urea nitrogen and lactate dehydrogenase activity...
September 6, 2017: Archives of Physiology and Biochemistry
https://www.readbyqxmd.com/read/28863172/regulation-of-xanthine-dehydrogensase-gene-expression-and-uric-acid-production-in-human-airway-epithelial-cells
#12
Ryan D Huff, Alan C-Y Hsu, Kristy S Nichol, Bernadette Jones, Darryl A Knight, Peter A B Wark, Philip M Hansbro, Jeremy A Hirota
INTRODUCTION: The airway epithelium is a physical and immunological barrier that protects the pulmonary system from inhaled environmental insults. Uric acid has been detected in the respiratory tract and can function as an antioxidant or damage associated molecular pattern. We have demonstrated that human airway epithelial cells are a source of uric acid. Our hypothesis is that uric acid production by airway epithelial cells is induced by environmental stimuli associated with chronic respiratory diseases...
2017: PloS One
https://www.readbyqxmd.com/read/28854342/short-term-effects-of-hemodiafiltration-versus-conventional-hemodialysis-on-erythrocyte-performance
#13
Hara T Georgatzakou, Vassilis L Tzounakas, Anastasios G Kriebardis, Athanassios D Velentzas, Apostolos C Kokkalis, Marianna H Antonelou, Issidora S Papassideri
Hemodiafiltration (HDF) is a renal replacement therapy which is based on the principles of diffusion and convection for the elimination of uremic toxins. A significant and increasing number of end stage renal disease (ESRD) patients are treated with HDF, even in the absence of definite and conclusive survival and anemia treatment data. However, its effects on red blood cell (RBC) physiological features have not been examined in depth. In this study, ESRD patients under regular HDF or conventional hemodialysis (cHD) treatment were examined for RBC-related parameters, including anemia, hemolysis, cell shape, redox status, removal signaling, membrane protein composition and microvesiculation, in repeated paired measurements accomplished before and right after each dialysis session...
August 30, 2017: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/28845530/association-between-the-antioxidant-uric-acid-and-depression-and-antidepressant-medication-use-in-96-989-individuals
#14
M K Wium-Andersen, C J Kobylecki, S Afzal, B G Nordestgaard
OBJECTIVE: In the last decade, several studies have suggested that depression is accompanied by increased oxidative stress and decreased antioxidant defenses. We tested the hypothesis that high levels of the antioxidant uric acid are associated with lower risk of hospitalization with depression and use of prescription antidepressant medication. METHOD: We examined plasma levels of the antioxidant uric acid in 96 989 individuals from two independent cohort studies...
August 28, 2017: Acta Psychiatrica Scandinavica
https://www.readbyqxmd.com/read/28833258/the-antioxidant-capacity-of-erythrocyte-concentrates-is-increased-during-the-first-week-of-storage-and-correlated-with-the-uric-acid-level
#15
M Bardyn, S Maye, A Lesch, J Delobel, J-D Tissot, F Cortés-Salazar, P Tacchini, N Lion, H H Girault, M Prudent
BACKGROUND AND OBJECTIVES: Red blood cells (RBCs) suffer from lesions during cold storage, depending in part on their ability to counterbalance oxidative stress by activating their antioxidant defence. The aim of this study was to monitor the antioxidant power (AOP) in erythrocyte concentrates (ECs) during cold storage. MATERIALS AND METHODS: Six ECs were prepared in saline-adenine-glucose-mannitol (SAGM) additive solution and followed during 43 days. The AOP was quantified electrochemically using disposable electrode strips and compared with results obtained from a colorimetric assay...
August 18, 2017: Vox Sanguinis
https://www.readbyqxmd.com/read/28822266/endogenous-non-enzymatic-antioxidants-in-the-human-body
#16
Iwona Mirończuk-Chodakowska, Anna Maria Witkowska, Małgorzata Elżbieta Zujko
The exposure of cells, tissues and extracellular matrix to harmful reactive species causes a cascade of reactions and induces activation of multiple internal defence mechanisms (enzymatic or non-enzymatic) that provide removal of reactive species and their derivatives. The non-enzymatic antioxidants are represented by molecules characterized by the ability to rapidly inactivate radicals and oxidants. This paper focuses on the major intrinsic non-enzymatic antioxidants, including metal binding proteins (MBPs), glutathione (GSH), uric acid (UA), melatonin (MEL), bilirubin (BIL) and polyamines (PAs)...
August 16, 2017: Advances in Medical Sciences
https://www.readbyqxmd.com/read/28811749/acute-cocoa-flavanols-intake-has-minimal-effects-on-exercise-induced-oxidative-stress-and-nitric-oxide-production-in-healthy-cyclists-a-randomized-controlled-trial
#17
Lieselot Decroix, Cajsa Tonoli, Danusa Dias Soares, Amandine Descat, Marie-José Drittij-Reijnders, Antje R Weseler, Aalt Bast, Wilhelm Stahl, Elsa Heyman, Romain Meeusen
BACKGROUND: Cocoa flavanols (CF) can stimulate vasodilation by improved nitric oxide (NO) synthesis and have antioxidant and anti-inflammatory capacities. This study aimed to examine whether acute CF intake can affect exercise-induced changes in antioxidant capacity, oxidative stress, inflammation and NO production, as well as exercise performance and recovery in well-trained cyclists. METHODS: Twelve well-trained male cyclists (mean ± SD age, VO2max: 30 ± 3 years, 63...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28811693/beneficial-effect-of-aqueous-garlic-extract-on-inflammation-and-oxidative-stress-status-in-the-kidneys-of-type-1-diabetic-rats
#18
Abolfazl Nasiri, Nasrin Ziamajidi, Roghayeh Abbasalipourkabir, Mohammad Taghi Goodarzi, Massoud Saidijam, Hamid Behrouj, Sara Solemani Asl
One of the most important complications of diabetes is nephropathy. This study investigates the effects of aqueous garlic extract on inflammation and oxidative stress status in the kidneys of diabetic rats. Male rats were divided into four groups- control rats, diabetic rats, garlic extract-treated diabetic rats, garlic extract-treated normal rats. The glucose, urea, uric acid, and creatinine levels were measured in sera using colorimetric methods. To determine the oxidative stress condition in the kidney tissues, total antioxidant capacity (TAC), malondialdehyde (MDA), and total oxidant status (TOS) were measured using colorimetric methods...
July 2017: Indian Journal of Clinical Biochemistry: IJCB
https://www.readbyqxmd.com/read/28811692/experimental-validation-of-antidiabetic-and-antioxidant-potential-of-cassia-tora-l-an-indigenous-medicinal-plant
#19
Vishnu Kumar, Ranjana Singh, Farzana Mahdi, Abbas Ali Mahdi, Raj Kumar Singh
The present study was undertaken to evaluate antidiabetic and antioxidant activities of Cassia tora (C. tora) seeds extract against streptozotocin induced diabetes in experimental rats to scientifically validate its use against diabetes. Ethanolic extract of C. tora seeds extract and standard drug (glibenclamide) prepared in aqueous gum acacia (2 %, w/v) suspension and fed orally to streptozotocin induced male adult diabetic rats of Charles Foster strain for 15 days. Biochemical parameters in normal, diabetic control, standard (600 μg/kg bw p...
July 2017: Indian Journal of Clinical Biochemistry: IJCB
https://www.readbyqxmd.com/read/28811686/influence-of-the-flavonoid-quercetin-on-antioxidant-status-lipid-peroxidation-and-histopathological-changes-in-hyperammonemic-rats
#20
Sivamani Kanimozhi, Pakkiri Bhavani, Perumal Subramanian
We have studied the ability of quercetin (a bioflavonoid) in tackling oxidative stress to alleviate the symptoms during ammonium chloride-induced hyperammonemia. Hyperammonemia was induced by the treatment of ammonium chloride (AC) 100 mg/kg b.w for 56 days. Hyperammonemic rats exhibited reduced urea (in plasma) and increased ammonia (in blood), uric acid (in plasma), creatinine (in serum), oxidative stress markers (thiobarbituric acid reactive substances (TBARS) and hydroperoxides (HP) and decreased levels of antioxidants (enzymatic and non-enzymatic) superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), reduced glutathione (GSH) in plasma and tissues (liver and brain) vitamins E and C (in plasma))...
July 2017: Indian Journal of Clinical Biochemistry: IJCB
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