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Allopurinol

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https://www.readbyqxmd.com/read/29457994/uric-acid-and-allopurinol-aggravate-absence-epileptic-activity-in-wistar-albino-glaxo-rijswijk-rats
#1
Renáta Krisztina Lakatos, Árpád Dobolyi, Zsolt Kovács
Uric acid has a role in several physiological and pathophysiological processes. For example, uric acid may facilitate seizure generalization while reducing uric acid level may evoke anticonvulsant/antiepileptic effects. Allopurinol blocks the activity of xanthine oxidase, by which allopurinol inhibits catabolism of hypoxanthine to xanthine and uric acid and, as a consequence, decreases the level of uric acid. Although the modulation of serum uric acid level is a widely used strategy in the treatment of certain diseases, our knowledge regarding the effects of uric acid on epileptic activity is far from complete...
February 16, 2018: Brain Research
https://www.readbyqxmd.com/read/29454286/the-vasodilatory-effect-of-allopurinol-mediates-its-antihypertensive-effect-effects-on-calcium-movement-and-cardiac-hemodynamics
#2
Hany M El-Bassossy, Mona F Mahmoud, Basma G Eid
Despite the reported reduction in blood pressure in hypertensive patients treated with allopurinol, the mechanism of the allopurinol hypotensive effect is still unclear. In the current study, the hypotensive effect of allopurinol has been fully investigated in hypertensive rats. Hypertension was induced in rats by angiotensin II (120 ng/min/kg) infusion for two weeks. Rats were then subjected to real-time recording of blood pressure, left ventricular pressure and volume and surface ECG. After 10 min of basal recording, allopurinol was slowly injected into the femoral vein with a dose of 10 μmole/kg...
February 14, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29447370/management-of-gout-by-uk-rheumatologists-a-british-society-for-rheumatology-national-audit
#3
Edward Roddy, Jon Packham, Karen Obrenovic, Ali Rivett, Joanna M Ledingham
Objectives: To assess the concordance of gout management by UK rheumatologists with evidence-based best-practice recommendations. Methods: Data were collected on patients newly referred to UK rheumatology out-patient departments over an 8-week period. Baseline data included demographics, method of diagnosis, clinical features, comorbidities, urate-lowering therapy (ULT), prophylaxis and blood tests. Twelve months later, the most recent serum uric acid level was collected...
February 13, 2018: Rheumatology
https://www.readbyqxmd.com/read/29445271/immune-cell-response-to-strenuous-resistive-breathing-comparison-with-whole-body-exercise-and-the-effects-of-antioxidants
#4
Andreas Asimakos, Dimitrios Toumpanakis, Maria-Helena Karatza, Spyridoula Vasileiou, Paraskevi Katsaounou, Zafeiria Mastora, Theodoros Vassilakopoulos
Background/hypothesis: Whole body exercise (WBE) changes lymphocyte subset percentages in peripheral blood. Resistive breathing, a hallmark of diseases of airway obstruction, is a form of exercise for the inspiratory muscles. Strenuous muscle contractions induce oxidative stress that may mediate immune alterations following exercise. We hypothesized that inspiratory resistive breathing (IRB) alters peripheral blood lymphocyte subsets and that oxidative stress mediates lymphocyte subpopulation alterations following both WBE and IRB...
2018: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/29432445/promising-effects-of-xanthine-oxidase-inhibition-by-allopurinol-on-autonomic-heart-regulation-estimated-by-heart-rate-variability-hrv-analysis-in-rats-exposed-to-hypoxia-and-hyperoxia
#5
Stanisław Zajączkowski, Wiesław Ziółkowski, Piotr Badtke, Miłosz A Zajączkowski, Damian J Flis, Adam Figarski, Maria Smolińska-Bylańska, Tomasz H Wierzba
BACKGROUND: It has long been suggested that reactive oxygen species (ROS) play a role in oxygen sensing via peripheral chemoreceptors, which would imply their involvement in chemoreflex activation and autonomic regulation of heart rate. We hypothesize that antioxidant affect neurogenic cardiovascular regulation through activation of chemoreflex which results in increased control of sympathetic mechanism regulating heart rhythm. Activity of xanthine oxidase (XO), which is among the major endogenous sources of ROS in the rat has been shown to increase during hypoxia promote oxidative stress...
2018: PloS One
https://www.readbyqxmd.com/read/29415653/xanthine-oxidase-inhibitors-for-prevention-of-cardiovascular-events-a-systematic-review-and-meta-analysis-of-randomized-controlled-trials
#6
Markus Bredemeier, Lediane Moreira Lopes, Matheus Augusto Eisenreich, Sheila Hickmann, Guilherme Kopik Bongiorno, Rui d'Avila, André Luis Bittencourt Morsch, Fernando da Silva Stein, Guilherme Gomes Dias Campos
BACKGROUND: Xanthine oxidase inhibitors (XOI), classified as purine-like (allopurinol and oxypurinol) and non-purine (febuxostat and topiroxostat) XOI, present antioxidant properties by reducing the production of reactive oxygen species derived from purine metabolism. Oxidative stress is an important factor related to endothelial dysfunction and ischemia-reperfusion injury, and may be implicated in the pathogenesis of heart failure, hypertension, and ischemic heart disease. However, there is contradictory evidence regarding the possible cardiovascular (CV) protective effect exerted by XOI...
February 7, 2018: BMC Cardiovascular Disorders
https://www.readbyqxmd.com/read/29414015/hydrazine-determination-in-allopurinol-using-derivatization-and-spe-for-sample-preparation
#7
Katalin Tamás, Enikő Wachter-Kiss, Róbert Kormány
Hydrazine is a useful building block in the synthesis of organic pharmaceuticals but it is highly toxic so its determination at low ppm range is required. In this work, hydrazine was determined in allopurinol active pharmaceutical ingredient (API) sample at 2.5 ppm level by using derivatization and solid phase extraction (SPE) followed by reversed phase liquid chromatography (RPLC). Hydrazine does not contain chromophore part and is not retained in RPLC thus derivatization was necessary for its determination...
January 26, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29409745/association-of-non-immediate-drug-hypersensitivity-with-drug-exposure-a-case-control-analysis-of-spontaneous-reports-from-a-tunisian-pharmacovigilance-database
#8
Amel Chaabane, Najeh Ben Fadhel, Zohra Chadli, Haifa Ben Romdhane, Nadia Ben Fredj, Naceur A Boughattas, Karim Aouam
PURPOSE: To assess delayed-type cutaneous reactions (DTCRs) related to drugs, using a case-control approach to qualify drug risks. METHODS: The study used the Tunisian pharmacovigilance database of Monastir. The association between drugs and DTCRs was assessed using a case/non-case method. Drugs were grouped according to the ATC Classification System. Patients were defined as "cases" if they have developed DTCRs regardless of the causality assessment. All other reports were "non-cases"...
February 3, 2018: European Journal of Internal Medicine
https://www.readbyqxmd.com/read/29393137/uric-acid-and-diabetic-nephropathy-risk
#9
Michael Mauer, Alessandro Doria
BACKGROUND: Diabetic nephropathy (DN) is the leading cause of end-stage renal disease (ESRD) in the western world. Current treatment methods, with better control of glycemia and blood pressure, including renin-angiotensin system blockade (RASB), appear to have slowed the DN progression rate but have not substantially decreased the annual incidence of new DN ESRD cases. Thus, new treatment targets are needed. SUMMARY: Higher levels of serum uric acid (UA) are associated with increased risk of the clinical manifestations of DN in persons with types 1 and 2 diabetes...
2018: Contributions to Nephrology
https://www.readbyqxmd.com/read/29393124/treatment-of-hyperuricemia-in-chronic-kidney-disease
#10
Juan C Ramirez-Sandoval, Magdalena Madero
Hyperuricemia may be a major contributor to the development or progression of chronic kidney disease (CKD). Although there is no clear cutoff uric acid (UA) value associated to the risk for kidney damage, it appears to be an increased risk as UA rises. Lifestyle interventions such as exercise, weight reduction, low consumption of purine-rich meat, or avoiding high fructose intake are recommended for all hyperuricemic patients. Lowering urate drugs such as allopurinol or febuxostat may be an option as a renoprotective agent; yet, randomized clinical trials evaluating the safety and efficacy of these drugs are limited to a small number of single-center studies...
2018: Contributions to Nephrology
https://www.readbyqxmd.com/read/29393121/time-to-target-uric-acid-to-retard-chronic-kidney-disease-progression
#11
Shunya Uchida, Takanori Kumagai, Wen Xiu Chang, Yoshifuru Tamura, Shigeru Shibata
Uric acid (UA) remains a risk factor for the progression of chronic kidney disease (CKD). Most observational studies showed a slight elevation in the serum UA level and this independently predicts the incidence and development of CKD. The recent meta-analysis, however, did not reach the conclusion that urate-lowering therapy with allopurinol retards the progression of CKD. The target level of serum UA if treated is another issue of debate. Our recent analysis by propensity score analysis has shown that the serum UA should be targeted below 6...
2018: Contributions to Nephrology
https://www.readbyqxmd.com/read/29393109/hyperuricemia-and-progression-of-chronic-kidney-disease-role-of-phenotype-transition-of-renal-tubular-and-endothelial-cells
#12
Duk-Hee Kang
BACKGROUND: Although the clinical implication of hyperuricemia in chronic kidney disease has been an issue of active debate, recent data suggested a causative role of uric acid (UA) in the development of renal disease. Afferent arteriopathy, an induction of oxidative stress and an activation of local inflammation, have been regarded as the mechanisms of UA-induced renal disease, which contribute to glomerular hypertrophy and interstitial fibrosis via endothelial dysfunction. However, there have been rare studies on the direct effect of UA on phenotype transition of renal cells such as epithelial-to-mesenchymal transition (EMT) or endothelial-to-mesenchymal transition (EndoMT)...
2018: Contributions to Nephrology
https://www.readbyqxmd.com/read/29393086/uric-acid-the-unknown-uremic-toxin
#13
Alejandro Treviño-Becerra
This review brings together concepts of uric acid metabolism affecting renal parenchyma and its function and the current therapies to reduce hyperuricemia (HyU) and avoid renal disease progression. High uric acid plays an important role in several chronic diseases including kidney diseases such as lithiasis, gout nephropathy, and preeclampsia. In the last 30 years, it has been shown that reducing HyU with low protein and low purine diets in addition to allopurinol creates physiopathological conditions that produce a slight increase in the glomerular filtration rate (GFR)...
2018: Contributions to Nephrology
https://www.readbyqxmd.com/read/29390240/-hyperuricaemia-and-chronic-kidney-disease
#14
Carlo Garofalo, Toni De Stefano, Carlo Vita, Giorgia Vinci, Francesco Balia, Francesca Nettuno, Luisa Scarpati, Azzurra Sguazzo, Alessandra Sagliocchi, Mario Pacilio, Roberto Minutolo, Luca De Nicola, Silvio Borrelli
Hyperuricemia is defined as serum uric acid values greater than 6 mg/dl and could occur either due to hyperproduction or as a result of reduced renal excretion, which exceeds gut compensation. In Italy, prevalence is around 12% of the general population and increases in renal disease up to 60%. Recent experimental studies demonstrated a role of uric acid in the development of arterial hypertension and systemic arteriosclerosis, with an increase in cardiovascular risk. It also appears from observational studies that high uric acid is an independent risk factor associated with de novo onset of chronic kidney disease after adjustment of main confounding variables...
February 2018: Giornale Italiano di Nefrologia: Organo Ufficiale Della Società Italiana di Nefrologia
https://www.readbyqxmd.com/read/29390003/correction-ecstasy-induces-reactive-oxygen-species-kidney-water-absorption-and-rhabdomyolysis-in-normal-rats-effect-of-n-acetylcysteine-and-allopurinol-in-oxidative-stress-and-muscle-fiber-damage
#15
Ana C de Bragança, Regina L M Moreau, Thales de Brito, Maria H M Shimizu, Daniele Canale, Denise A de Jesus, Ana M G Silva, Pedro H Gois, Antonio C Seguro, Antonio J Magaldi
[This corrects the article DOI: 10.1371/journal.pone.0179199.].
2018: PloS One
https://www.readbyqxmd.com/read/29383389/gout-as-a-risk-factor-for-osteoporosis-epidemiologic-evidence-from-a-population-based-longitudinal-study-involving-108-060-individuals
#16
V C Kok, J-T Horng, M N Wang, Z-Y Chen, J-T Kuo, G-D Hung
Is gout a risk factor for future osteoporosis? This large population-based study comprising two matched groups of individuals with and without gout demonstrates that patients with gout have a 20% increase in the risk of developing osteoporosis in future through an 8-year follow-up. INTRODUCTION: To examine if gout is associated with an increased risk of osteoporosis. METHODS: We conducted a nationwide population-based retrospective matched-cohort study. Two matched cohorts (n = 36,458 with gout and 71,602 without gout) assembled and recruited from the Longitudinal Health Insurance Dataset containing 1 million subjects...
January 30, 2018: Osteoporosis International
https://www.readbyqxmd.com/read/29382583/a-novel-igg1-monoclonal-antibody-against-xanthine-oxidase-alleviates-inflammation-induced-by-potassium-oxonate-in-mice
#17
Xiaoran Liu, Ya Li, Zhixin Li, Xiaomin Wei, Yanjie Ma, Peng Cheng, Rui Jiao, Jinzhi Fang, Yun Xing, Jiali Tang, Min Wang, Taiming Li
Xanthine oxidase (XOD) is a key enzyme that catalyzes xanthine to uric acid. Most of the urate-lowering medicines targeting XOD have a limited effect on alleviating inflammation in spite of significant effects on decreasing serum uric acid level. In this study, we produced and characterized a novel monoclonal antibody (Anti-XOD mAb) using hybridoma technology based on a novel peptide OI5P-1(O-IA2(5)-P2-1),which containing a B-cell epitope of XOD and a novel Th2 built-in adjuvant I5P-1(IA2(5)-P2-1). Results of western blotting and cross-reactivity assay indicated that the mAb binds specifically to XOD and the affinity was 2...
January 27, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29371869/allopurinol-prophylactic-therapy-and-the-prevention-of-contrast-induced-nephropathy-in-high-risk-patients-undergoing-coronary-angiography-a-prospective-randomized-controlled-trial
#18
Leili Iranirad, Mohammad Saleh Sadeghi, Ahmadreza Bagheri, Kobra Doostali, Samieh Norouzi, Seyed Fakhreddin Hejazi, Hossein Saghafi, Sakineh Roshani-Mobaraki
BACKGROUND: Contrast-induced nephropathy (CIN) is considered to be a possibly severe complication of radiography and thus, remains to be the main cause of acute kidney injury (AKI) for inpatients. A clinical trial was executed to measure the preventive effect of allopurinol against CIN in high-risk patients undertaking coronary angiography. METHODS: Through randomized controlled trial, 140 patients with at minimum two risk factors of CIN, undertaking coronary angiography, were randomly allocated to the allopurinol (n = 70) or control group (n = 70)...
September 2017: ARYA Atherosclerosis
https://www.readbyqxmd.com/read/29357999/recommendations-of-the-spanish-working-group-on-crohn-s-disease-and-ulcerative-colitis-geteccu-on-the-use-of-tiopurines-in-inflammatory-bowel-disease
#19
Fernando Bermejo, Mariam Aguas, María Chaparro, Eugeni Domènech, Ana Echarri, Esther Garcia-Planella, Iván Guerra, Javier P Gisbert, Antonio López-Sanromán
Thiopurines (azathioprine and mercaptopurine) are widely used in patients with inflammatory bowel disease. In this paper, we review the main indications for their use, as well as practical aspects on efficacy, safety and method of administration. They are mainly used to maintain remission in steroid-dependent disease or with ciclosporin to control a severe ulcerative colitis flare-up, as well as to prevent postoperative Crohn's disease recurrence, and also in combination therapy with biologics. About 30-40% of patients will not respond to treatment and 10-20% will not tolerate it due to adverse effects...
January 18, 2018: Gastroenterología y Hepatología
https://www.readbyqxmd.com/read/29352771/severe-cutaneous-adverse-reactions-due-to-inappropriate-medication-use
#20
G Chaby, L Valeyrie-Allanore, T A Duong, B Lebrun-Vignes, B Milpied, B Sassolas, F Tetart, P Wolkenstein, O Chosidow, L Fardet
BACKGROUD: The proportion of severe cutaneous adverse reactions (SCARs) that could be avoided if medication use was consistent with good medical practice is unknown. OBJECTIVES: To estimate the proportion of SCARs related to inappropriate medication use. METHODS: Retrospective study of all validated SCARs collected in a French registry between 2003 and 2016. For each case, all plausible drugs suspected to induce SCARs (i.e., not just the drug regarded as "the most probable") were considered regarding three causes of preventability: (1) prescription for an inappropriate indication, (2) unintentional rechallenge despite a previous allergy to the drug, or (3) self-medication with prescription medicines...
January 20, 2018: British Journal of Dermatology
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