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Uric acid antioxidant

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https://www.readbyqxmd.com/read/28223818/an-evidence-based-review-on-urate-lowering-treatments-implications-for-optimal-treatment-of-chronic-hyperuricemia
#1
REVIEW
Marilisa Bove, Arrigo Francesco Giuseppe Cicero, Maddalena Veronesi, Claudio Borghi
Several studies suggest that chronic hyperuricemia, the main precursor of gout, is involved in the pathogenesis of different systemic disorders that affect cardiovascular and renal systems, such as hypertension, obesity, hypercholesterolemia, atherosclerosis, metabolic syndrome, chronic heart failure, and chronic kidney disease. Recent epidemiological evidence has shown an increasing trend in the prevalence of hyperuricemia and gout in the Western world: a number of population-based studies estimate a prevalence of up to 21% for hyperuricemia and 1%-4% for gout...
2017: Vascular Health and Risk Management
https://www.readbyqxmd.com/read/28209096/increased-oxidative-stress-alters-nucleosides-metabolite-levels-in-sickle-cell-anemia
#2
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/28203247/elevated-serum-uric-acid-levels-are-related-to-cognitive-deterioration-in-an-elderly-japanese-population
#3
Kazushi Suzuki, Daisuke Koide, Kurumi Fujii, Tsutomu Yamazaki, Shoji Tsuji, Atsushi Iwata
AIMS: The association between serum uric acid (UA) levels and cognitive function is controversial since UA can be a risk factor for cerebral ischemia as well as acting as a neuroprotective antioxidant. METHODS: We conducted a cross-sectional analysis of 228 elderly participants and examined neuropsychological test results, clinical data as well as brain magnetic resonance imaging data. PATIENTS: Overall, 64 participants were diagnosed with cognitive deterioration...
September 2016: Dementia and Geriatric Cognitive Disorders Extra
https://www.readbyqxmd.com/read/28198206/nitraria-retusa-fruit-prevents-penconazole-induced-kidney-injury-in-adult-rats-through-modulation-of-oxidative-stress-and-histopathological-changes
#4
Mariem Chaâbane, Mohamed Koubaa, Nejla Soudani, Awatef Elwej, Malek Grati, Kamel Jamoussi, Tahia Boudawara, Semia Ellouze Chaabouni, Najiba Zeghal
CONTEXT: Nitraria retusa (Forssk.) Asch. (Nitrariaceae) is a medicinal plant which produces edible fruits whose antioxidant activity has been demonstrated. OBJECTIVE: The current study elucidates the potential protective effect of N. retusa fruit aqueous extract against nephrotoxicity induced by penconazole, a triazole fungicide, in the kidney of adult rats. MATERIALS AND METHODS: Adult Wistar rats were exposed either to penconazole (67 mg/kg body weight), or to N...
December 2017: Pharmaceutical Biology
https://www.readbyqxmd.com/read/28197933/garlic-extract-attenuates-immobilization-stress-induced-alterations-in-plasma-antioxidant-oxidant-parameters-and-hepatic-function-in-rats
#5
Syed Kashif Zaidi, Shakeel Ahmed Ansari, Shams Tabrez, Md Nasrul Hoda, Ghulam Md Ashraf, Mohd Shahnawaz Khan, Sultan Alnohair, Naheed Banu, Mohammed Hussain Al-Qahtani
OBJECTIVE: To investigate the oxidative stress induced by 6 h of immobilization stress in Albino Wistar rats. Further, the pre- and post-treatment of aqueous garlic extract was studied to evaluate its preventive and curative efficacy on stress-induced altered oxidative parameters in rats. METHODS: Albino Wistar rats were exposed to 6 h of immobilization stress, and received garlic extract (100 mg/kg body weight) treatment pre- or post-stress exposure. The oxidative status of plasma after various treatments were evaluated by determining the levels of reduced glutathione, glucose, uric acid, thiobarbituric acid reactive substances, aspartate aminotransferase (AST), alanine transaminase (ALT), alkaline phosphatase (ALP) and the activities of superoxide dismutase, catalase and glutathione-S-transferase by standardized procedures...
February 15, 2017: Chinese Journal of Integrative Medicine
https://www.readbyqxmd.com/read/28141910/the-mechanism-of-valproic-acid-induced-fanconi-syndrome-involves-mitochondrial-dysfunction-and-oxidative-stress-in-rat-kidney
#6
Reza Heidari, Faezeh Jafari, Forouzan Khodaei, Babak Shirazi Yeganeh, Hossein Niknahad
AIM: Drug-induced kidney proximal tubular injury and renal failure (Fanconi syndrome; FS) is a clinical complication. Valproic acid (VPA) is among the FS-inducing drugs. The current investigation was designed to evaluate the role of mitochondrial dysfunction and oxidative stress in VPA-induced renal injury. METHODS: Animals received VPA (250 and 500 mg/kg, i.p., 15 consecutive days). Serum biomarkers of kidney injury and markers of oxidative stress were assessed...
January 31, 2017: Nephrology
https://www.readbyqxmd.com/read/28121473/nephroprotective-and-anti-inflammatory-effects-of-pistacia-atlantica-leaf-hydroethanolic-extract-against-gentamicin-induced-nephrotoxicity-in-rats
#7
Esfandiar Heidarian, Effat Jafari-Dehkordi, Parisa Valipour, Keihan Ghatreh-Samani, Leila Ashrafi-Eshkaftaki
Gentamicin in overdose can lead to tubular injury and kidney dysfunction. Some antioxidants can protect kidneys against nephrotoxicity. This study was undertaken to evaluate the protective effects of Pistacia atlantica (P. atlantica) leaf hydroethanolic extract against gentamicin-induced nephrotoxicity in rats. Forty rats were divided into five groups: the first group received a daily intraperitoneal (i.p.) injection of normal saline. The second group received gentamicin (120 mg/kg, i.p.). The third, fourth, and fifth groups were orally treated with 200, 400, and 800 mg/kg of P...
January 25, 2017: Journal of Dietary Supplements
https://www.readbyqxmd.com/read/28113117/induction-of-apoptosis-and-dna-damage-by-4-nonylphenol-in-african-catfish-clarias-gariepinus-and-the-antioxidant-role-of-cydonia-oblonga
#8
Alaa El-Din H Sayed, Heba S Hamed
In this study, we assessed the toxic effects of sub lethal concentration (0.1mgl(-1)) 4-nonylphenol (4-NP) on serum biochemical parameters, liver lipid peroxidation (LPO) and antioxidant enzymes of the African catfish Clarias gariepinus for 14 days and the ability of the quince leaf extract to alleviate the effects of (4-NP). Fish were categorized into four groups: control, exposure to 0.1mgl(-1) 4-NP, exposure to 0.1mgl(-1) 4-NP with quince leaf extract (10ml/30L water), and exposure to 0.1mgl(-1) 4-NP with quince leaf extract (20ml/30L water)...
January 20, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28109403/total-antioxidant-capacity-in-beta-thalassemia-a-systematic-review-and-meta-analysis-of-case-control-studies
#9
REVIEW
Husseen Manafikhi, Gregor Drummen, Maura Palmery, Ilaria Peluso
Total Antioxidant Capacity (TAC), a biomarker measuring the antioxidant potential of body fluids, including redox synergistic interactions, is influenced by the presence of products of catabolism such as bilirubin (BR) and uric acid (UA). Hyperuricaemia and increased BR levels were observed in thalassemia. In order to evaluate the differences in TAC values between thalassemic patients and healthy subjects, we performed a systematic review and meta-analysis of case-control studies. After the exclusion of data deemed unsuitable for meta-analysis inclusion and a study imputed of bias by Trim-and-fill analysis, mean difference (MD) and confidence intervals 95% (CI 95%) were calculated by the random effect model for beta-thalassemia major (BTM) (1351 subjects: 770 thalassemic and 581 controls, from 15 studies) and Trait (BTT) or Hemoglobin E (BTE) (475 subjects: 165 thalassemic and 310 controls, from 5 studies)...
February 2017: Critical Reviews in Oncology/hematology
https://www.readbyqxmd.com/read/28099963/low-molecular-weight-hydrophilic-and-lipophilic-antioxidants-in-nonmelanoma-skin-carcinomas-and-adjacent-normal-looking-skin
#10
Konstantina Grammenandi, Maria Kyriazi, Alexandra Katsarou-Katsari, Othon Papadopoulos, Ioanna Anastassopoulou, Georgios T Papaioannou, Alexandros Sagriotis, Michail Rallis, Howard I Maibach
Low-molecular-weight antioxidants are some of the most efficient agents of the skin defense mechanism against environmental factors, such as cosmic rays, smoke, and pollutants. The total skin concentrations of hydrophilic ascorbic and uric acids, as well as lipophilic α-tocopherol, β-carotene, and ubiquinol-10 antioxidants were determined by an HPLC-EC detector from 18 biopsies of human nonmelanoma skin carcinomas and 18 biopsies from skin areas adjacent to carcinomas. No significant differences in the concentrations of lipophilic antioxidants in both carcinomas and normal-looking skin areas adjacent to carcinomas were observed...
2016: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28088113/modulatory-effect-of-vanillic-acid-on-antioxidant-status-in-high-fat-diet-induced-changes-in-diabetic-hypertensive-rats
#11
Kolanji Vinothiya, Natarajan Ashokkumar
The worldwide incidence of diabetes has increased dramatically along with widespread lifestyle and dietary changes. Diets high in fat are strongly associated with the development of obesity and can induce insulin resistance in humans and animals. It is clear that obesity constitutes a risk factor for contributing to the development of type 2 diabetes. In the present study, we investigated the therapeutic potential action of vanillic acid on diabetes associated complications using a rat model. Rats were made diabetic hypertensive by high fat diet (HFD) for 20 weeks and were treated with vanillic acid (50mg/kg bw) for last 8 weeks...
March 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28067806/high-uric-acid-ameliorates-indoxyl-sulfate-induced-endothelial-dysfunction-and-is-associated-with-lower-mortality-among-hemodialysis-patients
#12
Wei-Liang Hsu, Szu-Yuan Li, Jia-Sin Liu, Po-Hsun Huang, Shing-Jong Lin, Chih-Cheng Hsu, Yao-Ping Lin, Der-Cherng Tarng
High uric acid (UA) can act as a pro-oxidant in normal physiological conditions; however, emerging evidence is still debatable with regard to the association between high UA and poor outcomes among chronic hemodialysis (HD) patients. In the present study, 27,229 stable prevalent HD patients were enrolled and divided into four groups according to the quartiles of baseline UA concentration, and 5737 died during a median follow-up of 38 months. Multivariate Cox regression analysis showed that a UA level of <6...
January 6, 2017: Toxins
https://www.readbyqxmd.com/read/28065878/coordination-between-antioxidant-defences-might-be-partially-modulated-by-magnesium-status
#13
Cristina Paula Monteiro, Catarina Nunes Matias, Manuel Bicho, Helena Santa-Clara, Maria José Laires
The aim of this study was to compare the redox balance in competitive adult swimmers against recreational practitioners, controlling for Mg intake. Fifteen, competitive swimmers and 16 recreational practitioners, all male and aged 18-25years, were recruited into the study. Oxidative and muscle damage markers, and antioxidant enzymes and non-enzymatic antioxidants were evaluated by photometry (except for thiobarbituric reactive substances (TBARS), which was assessed by fluorimetry). Controlling for the level of exercise, inverse correlations were observed for uric acid and glutathione reductase (GR) or susceptibility of red blood cells to peroxidation (RBCPx); plasma adrenaline oxidase activity (AdOx) and carotenoids; TBARS and GR or Vit E; and direct correlations were observed between AdOx and creatine kinase (CK) or TBARS; CK and superoxide dismutase activity; GR and RBCPx...
January 6, 2017: Magnesium Research: Official Organ of the International Society for the Development of Research on Magnesium
https://www.readbyqxmd.com/read/28062372/uric-acid-may-be-protective-against-cognitive-impairment-in-older-adults-but-only-in-those-without-cardiovascular-risk-factors
#14
Busra Tuven, Pinar Soysal, Gulcin Unutmaz, Derya Kaya, Ahmet Turan Isik
Uric acid (UA) may not only prevent development of cognitive dysfunction owing to its antioxidant efficacy, but also may worsen cognitive functions by gaining pro-oxidant character. The present study attempts to uncover this paradoxical association between UA and cognitive impairment in elderly. 1374 elderly patients were retrospectively evaluated and included in the study. Participants underwent determination of circulating UA levels and comprehensive geriatric assessment. A serum UA concentration≥7.0mg/dL in males and ≥5...
January 4, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28057038/aldose-reductase-mediates-endothelial-cell-dysfunction-induced-by-high-uric-acid-concentrations
#15
Zhiyong Huang, Quan Hong, Xueguang Zhang, Wenzhen Xiao, Liyuan Wang, Shaoyuan Cui, Zhe Feng, Yang Lv, Guangyan Cai, Xiangmei Chen, Di Wu
BACKGROUND: Uric acid (UA) is an antioxidant found in human serum. However, high UA levels may also have pro-oxidant functions. According to previous research, aldose reductase (AR) plays a vital role in the oxidative stress-related complications of diabetes. We sought to determine the mechanism by which UA becomes deleterious at high concentrations as well as the effect of AR in this process. METHOD: Endothelial cells were divided into three groups cultured without UA or with 300 μM or 600 μM UA...
January 5, 2017: Cell Communication and Signaling: CCS
https://www.readbyqxmd.com/read/28056421/capparis-spinosa-leaves-extract-source-of-bioantioxidants-with-nephroprotective-and-hepatoprotective-effects
#16
Nizar Tlili, Anouar Feriani, Ezzeddine Saadoui, Nizar Nasri, Abdelhamid Khaldi
Capparis spinosa, Capparidaceae, is largely distributed all over the Mediterranean Basin and is traditionally used to treat many illnesses, such as liver and kidney diseases. The aim of the current study was to explore the antioxidant, nephroprotective and hepatoprotective effects of methanolic extract of Capparis spinosa leaves (MECS) associated with its phytochemical content. The levels of total phenolics, flavonoids and condensed tannins were 23.37mgGAE/g, 9.05mgQE/g and 9.35mgTAE/g, respectively. HPLC analysis revealed nine compounds, namely rutin, resveratrol, coumarin, epicatechin, luteolin, catechin, kaempferol, vanillic acid and gallic acid...
March 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28053566/protective-effect-of-olive-and-juniper-leaves-extracts-on-nephrotoxicity-induced-by-thioacetamide-in-male-mice
#17
Atef M Al-Attar, Ali A Alrobai, Daklallah A Almalki
This study, for the first time, evaluates the effect of olive and juniper leaves extracts and their combination on thioacetamide (TAA)-induced nephrotoxicity in male mice. The experimental mice were divided into eight groups. Group 1 was served as control. Group 2 was exposed to TAA. Group 3 was treated with TAA and olive leaves extract. Group 4 was subjected to TAA and juniper leaves extract. Group 5 was exposed to TAA and olive and juniper leaves extracts. Groups 6, 7 and 8 were treated with olive, juniper, and olive and juniper leaves extracts respectively...
January 2017: Saudi Journal of Biological Sciences
https://www.readbyqxmd.com/read/28039850/therapeutic-potential-of-quercetin-against-acrylamide-induced-toxicity-in-rats
#18
Chhavi Uthra, Sadhana Shrivastava, Amita Jaswal, Neelu Sinha, Mohd Salim Reshi, Sangeeta Shukla
Acrylamide (AA) is found in foods containing carbohydrates and proteins, where it is formed during the heating process. It is classified as neurotoxic and probably carcinogenic to humans. The present investigation was aimed to determine the lethal Dose (LD50) of AA and to evaluate the protective effects of quercetin (QE) against AA induced adverse effects in rats. For the determination of LD50, AA was administered orally at four different doses (46.4mg/kg, 100mg/kg, 215mg/kg and 464mg/kg) to experimental animals for seven days...
February 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28028984/whole-body-cryostimulation-as-an-effective-method-of-reducing-oxidative-stress-in-healthy-men
#19
Agata Stanek, Karolina Sieroń-Stołtny, Ewa Romuk, Armand Cholewka, Tomasz Wielkoszyński, Grzegorz Cieślar, Sebastian Kwiatek, Aleksander Sieroń, Aleksandra Kawczyk-Krupka
BACKGROUND: Whole-body cryostimulation (WBC) is the therapeutic exposure of the total human body (without underwear) to a very low temperature (below -100°C) for 120-180 s. Currently, WBC is used more frequently not only in the treatment of patients suffering from various diseases, but also by healthy people as a wellness method. OBJECTIVES: The aim of this research is to evaluate the impact of WBC procedures on oxidative stress parameters in healthy men. MATERIAL AND METHODS: The study involved 32 healthy male subjects who were randomly divided into 2 groups: 16 men exposed to WBC procedures with subsequent kinesiotherapy (WBC group) and 16 men exposed only to kinesiotherapy procedures (KT group)...
November 2016: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/28024289/protective-abilities-of-pyridoxine-in-experimental-oxidative-stress-settings-in-vivo-and-in-vitro
#20
K E Danielyan, A A Simonyan
BACKGROUND: Pyridoxine (Pr, B6) or its active form pyridoxal phosphate (PLP, B6) deficiency promotes oxidative lipid peroxidation and exacerbates the oxidative stress. From the other hand, by our previous experiments we proved that B6 is able strongly inhibit Xanthine Oxidase (XO) activity, which is an enzyme responsible for the formation of uric acid and hydrogen peroxide. METHODS: Cells were cultured by Mattson M. method and treated with 3%% hydrogen peroxide...
February 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
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