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https://www.readbyqxmd.com/read/28550118/s100a9-potentiates-the-activation-of-neutrophils-by-the-etiological-agent-of-gout-monosodium-urate-crystals
#1
Louis-Simon Rousseau, Guillaume Paré, Asmaa Lachhab, Paul H Naccache, François Marceau, Philippe Tessier, Martin Pelletier, Maria Fernandes
Gout is one of the most painful types of arthritis that arises when the body mounts an acute inflammatory reaction against a crystallized form of uric acid known as monosodium urate crystals (MSUs). Although MSUs are known to activate neutrophils, the most abundant leukocyte in the synovial fluid of patients with gout, few studies have investigated the effect on neutrophils of the simultaneous stimulation with MSU and proinflammatory mediators in the inflamed joint. Herein, we focused on a protein that is highly expressed in the synovium in gout, S100A9...
May 26, 2017: Journal of Leukocyte Biology
https://www.readbyqxmd.com/read/28544467/a-survey-on-the-beliefs-and-knowledge-of-gout-management-in-new-medical-graduates-new-south-wales-australia
#2
Matthew Terrill, John Riordan
AIM: To assess the beliefs and knowledge of gout management in new medical graduates. METHOD: A survey on gout management was sent to new medical graduates during their orientation week, New South Wales, Australia. RESULTS: Of 15 hospital networks, 11 agreed to participate. From these, 168 graduates responded (23.7% response rate). Most (81.1%) felt that gout was a serious disease, 51.2% answered that they had been taught adequately to manage acute gout, only 37...
May 25, 2017: International Journal of Rheumatic Diseases
https://www.readbyqxmd.com/read/28539973/are-ultrasound-features-at-the-first-metatarsophalangeal-joint-associated-with-clinically-assessed-pain-and-function-a-study-of-people-with-gout-asymptomatic-hyperuricaemia-and-normouricaemia
#3
Sarah Stewart, Nicola Dalbeth, Alain C Vandal, Bruce Allen, Rhian Miranda, Keith Rome
BACKGROUND: The first metatatarsophalangeal joint (1st MTP joint) is a common location for sonographic evidence of urate deposition in people with gout and asymptomatic hyperuricaemia. However, it is unclear whether these are related to clinically-assessed pain and function. This study aimed to determine the association between ultrasound features and clinical characteristics of the 1st MTP joint in people with gout, asymptomatic hyperuricaemia and age- and sex-matched normouricaemic individuals...
2017: Journal of Foot and Ankle Research
https://www.readbyqxmd.com/read/28539925/cxcl9-derived-peptides-differentially-inhibit-neutrophil-migration-in-vivo-through-interference-with-glycosaminoglycan-interactions
#4
Vincent Vanheule, Daiane Boff, Anneleen Mortier, Rik Janssens, Björn Petri, Elzbieta Kolaczkowska, Paul Kubes, Nele Berghmans, Sofie Struyf, Andreas J Kungl, Mauro Martins Teixeira, Flavio Almeida Amaral, Paul Proost
Several acute and chronic inflammatory diseases are driven by accumulation of activated leukocytes due to enhanced chemokine expression. In addition to specific G protein-coupled receptor-dependent signaling, chemokine-glycosaminoglycan (GAG) interactions are important for chemokine activity in vivo. Therefore, the GAG-chemokine interaction has been explored as target for inhibition of chemokine activity. It was demonstrated that CXCL9(74-103) binds with high affinity to GAGs, competed with active chemokines for GAG binding and thereby inhibited CXCL8- and monosodium urate (MSU) crystal-induced neutrophil migration to joints...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28533544/sex-specific-metabolic-profiles-of-androgens-and-its-main-binding-protein-shbg-in-a-middle-aged-population-without-diabetes
#5
Uwe Piontek, Henri Wallaschofski, Gabi Kastenmüller, Karsten Suhre, Henry Völzke, Kieu Trinh Do, Anna Artati, Matthias Nauck, Jerzy Adamski, Nele Friedrich, Maik Pietzner
The role of androgens in metabolism with respect to sex-specific disease associations is poorly understood. Therefore, we aimed to provide molecular signatures in plasma and urine of androgen action in a sex-specific manner using state-of-the-art metabolomics techniques. Our study population consisted of 430 men and 343 women, aged 20-80 years, who were recruited for the cross-sectional population-based Study of Health in Pomerania (SHIP-TREND), Germany. We used linear regression models to identify associations between testosterone, androstenedione and dehydroepiandrosterone-sulfate (DHEAS) as well as sex hormone-binding globulin and plasma or urine metabolites measured by mass spectrometry...
May 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28531234/directed-evolution-to-improve-the-catalytic-efficiency-of-urate-oxidase-from-bacillus-subtilis
#6
Wenjie Li, Shouteng Xu, Biao Zhang, Yelin Zhu, Yan Hua, Xin Kong, Lianhong Sun, Jiong Hong
Urate oxidase is a key enzyme in purine metabolism and catalyzes the oxidation of uric acid to allantoin. It is used to treat hyperuricemia and gout, and also in a diagnostic kit. In this study, error-prone polymerase chain reaction and staggered extension process was used to generate a mutant urate oxidase with improved enzyme activity from Bacillus subtilis. After several rounds of mutagenesis and screening, two mutants 6E9 and 8E279 were obtained which exhibited 2.99 and 3.43 times higher catalytic efficiency, respectively...
2017: PloS One
https://www.readbyqxmd.com/read/28530520/cardiovascular-disease-and-gout-real-world-experience-evaluating-patient-characteristics-treatment-patterns-and-health-care-utilization
#7
Michael H Pillinger, Sripal Bangalore, Alyssa B Klein, Scott Baumgartner, Robert Morlock
BACKGROUND: Gout, hyperuricemia, and cardiovascular disease (CVD) are prevalent conditions in the United States, and while they share common risk factors such as obesity, hypertension, hypercholesterolemia, and type 2 diabetes mellitus, relatively little is known about what patient and disease characteristics may link CVD with hyperuricemia and gout and how the presence of both diseases affects management decisions differently than for patients with gout alone. OBJECTIVE: To identify differences in patient characteristics, patterns of urate-lowering therapy (ULT) use, and gout control in gout patients with and without cardiovascular comorbidity...
June 2017: Journal of Managed Care & Specialty Pharmacy
https://www.readbyqxmd.com/read/28529735/rosehip-inhibits-xanthine-oxidase-activity-and-reduces-serum-urate-levels-in-a-mouse-model-of-hyperuricemia
#8
Hidetomo Kikuchi, Satomi Kogure, Rie Arai, Kouki Saino, Atsuko Ohkubo, Tadashi Tsuda, Katsuyoshi Sunaga
Rosehip, the fruit of Rosa canina L., has traditionally been used to treat urate metabolism disorders; however, its effects on such disorders have not been characterized in detail. Therefore, the present study investigated the effects of hot water, ethanol and ethyl acetate extracts of rosehip on xanthine oxidase (XO) activity in vitro. In addition, the serum urate lowering effects of the rosehip hot water extract in a mouse model of hyperuricemia (male ddY mice, which were intraperitoneally injected with potassium oxonate) were investigated...
May 2017: Biomedical Reports
https://www.readbyqxmd.com/read/28527616/catalase-increases-ethanol-oxidation-through-the-purine-catabolism-in-rat-liver
#9
Daniel Villalobos-García, Rolando Hernández-Muñoz
Hepatic ethanoloxidationincreases according to its concentration and is raised to near-saturation levels of alcohol dehydrogenase (ADH); therefore, re-oxidation of NADH becomes rate limiting in ethanol metabolism by the liver. Adenosine is able to increase liver ethanol oxidation in both in vivo and in vitro conditions; the enhancement being related with the capacity of the nucleoside to accelerate the transport of cytoplasmic reducing equivalents to mitochondria, by modifying the subcellular distribution of the malate-aspartate shuttle components...
May 17, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/28521370/salvia-plebeia-extract-inhibits-xanthine-oxidase-activity-in-vitro-and-reduces-serum-uric-acid-in-an-animal-model-of-hyperuricemia
#10
Jin Kyu Kim, Woo Jung Kim, Jung Mi Hyun, Jong Suk Lee, Jin Gwan Kwon, Changon Seo, Myung-Jin Song, Chun Whan Choi, Seong Su Hong, Kyuhee Park, Pansoo Kim, Hachang Sung, Jin Koo Lee, Yongmun Choi
Hyperuricemia is a clinical condition characterized by an elevated level of serum uric acid and is a key risk factor for the development of gout and metabolic disorders. The existing urate-lowering therapies are often impractical for certain patient populations, providing a rationale to explore new agents with improved safety and efficacy. Here, we discovered that Salvia plebeia extract inhibited the enzyme activity of xanthine oxidase, which is a key enzyme generating uric acid in the liver. In an animal model of hyperuricemia, S...
May 18, 2017: Planta Medica
https://www.readbyqxmd.com/read/28509723/determinants-of-retinal-microvascular-features-and-their-relationships-in-two-european-populations
#11
Mirna Kirin, Reka Nagy, Thomas J MacGillivray, Ozren Polašek, Caroline Hayward, Igor Rudan, Harry Campbell, Sarah Wild, Alan F Wright, James F Wilson, Veronique Vitart
OBJECTIVES: To examine factors influencing retinal vasculature in two environmentally contrasted, cross-sectional studies of adult participants of European descent and to estimate the extent and specificity of genetic contributions to each retinal vasculature feature. METHODS: Retinal images from 1088 participants in the Orkney Complex Disease Study and 387 in the CROATIA-Korčula study, taken using the same nonmydriatic camera system and graded by the same person, were evaluated...
May 13, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/28508122/a-trivalent-enzymatic-system-for-uricolytic-therapy-of-hprt-deficiency-and-lesch-nyhan-disease
#12
Luca Ronda, Marialaura Marchetti, Riccardo Piano, Anastasia Liuzzi, Romina Corsini, Riccardo Percudani, Stefano Bettati
PURPOSE: Because of the evolutionary loss of the uricolytic pathway, humans accumulate poorly soluble urate as the final product of purine catabolism. Restoration of uricolysis through enzyme therapy is a promising treatment for severe hyperuricemia caused by deficiency of hypoxanthine-guanine phosphoribosyltransferase (HPRT). To this end, we studied the effect of PEG conjugation on the activity and stability of the enzymatic complement required for conversion of urate into the more soluble (S)-allantoin...
May 15, 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/28508104/quercetin-inhibits-gout-arthritis-in-mice-induction-of-an-opioid-dependent-regulation-of-inflammasome
#13
Kenji W Ruiz-Miyazawa, Larissa Staurengo-Ferrari, Sandra S Mizokami, Talita P Domiciano, Fabiana T M C Vicentini, Doumit Camilios-Neto, Wander R Pavanelli, Phileno Pinge-Filho, Flávio A Amaral, Mauro M Teixeira, Rubia Casagrande, Waldiceu A Verri
We investigated the anti-inflammatory and analgesic effects of quercetin in monosodium urate crystals (MSU)-induced gout arthritis, and the sensitivity of quercetin effects to naloxone, an opioid receptor antagonist. Mice were treated with quercetin, and mechanical hyperalgesia was assessed at 1-24 h after MSU injection. In vivo, leukocyte recruitment, cytokine levels, oxidative stress, NFκB activation, and gp91(phox) and inflammasome components (NLRP3, ASC, Pro-caspase-1, and Pro-IL-1β) mRNA expression by qPCR were determined in the knee joints at 24 h after MSU injection...
May 15, 2017: Inflammopharmacology
https://www.readbyqxmd.com/read/28492994/metabolic-characteristics-and-renal-dysfunction-in-65-patients-with-tophi-prior-to-gout
#14
Chuan-Chin Lu, Shyi-Kuen Wu, Wei-Sheng Chung, Liang-Hung Lin, Ta-Wei Hung, Chih-Jung Yeh
Tophi typically occur many years after uncontrolled gout. Therefore, their development before gout remains unusual. Such patients might exhibit some characteristic differences compared with typical tophaceous gout patients. In this study, 65 tophaceous gout patients with tophi as the first sign of gout (tophi-first group) were enrolled. Their clinical characteristics were compared with those of 1421 patients whose tophi occurred after gout (tophi-after group). Compared with the tophi-after group, the tophi-first group had a significantly higher percentage of female patients and patients with elderly onset of disease and a lower percentage of patients with a positive family history; these patients had lower body mass indices, serum urate levels, and estimated glomerular filtration rates (eGFRs)...
May 10, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28485997/prophylaxis-of-acute-flares-when-initiating-febuxostat-for-chronic-gouty-arthritis-in-a-real-world-clinical-setting
#15
Jinquan Yu, Qian Qiu, Liuqin Liang, Xiuyan Yang, Hanshi Xu
OBJECTIVE: Flare prophylaxis is recommended during urate-lowering therapy (ULT) despite lack of proven benefit especially when initiating febuxostat. We investigated if colchicine or steroids administration during initiation of febuxostat for chronic gouty arthritis reduces the frequency and/or severity of acute gout flares. METHODS: Patients with confirmed diagnosis of gout starting febuxostat were retrospectively studied. Frequency, severity, and length of flares were analyzed...
May 9, 2017: Modern Rheumatology
https://www.readbyqxmd.com/read/28484006/uric-acid-priming-in-human-monocytes-is-driven-by-the-akt-pras40-autophagy-pathway
#16
Tania O Crişan, Maartje C P Cleophas, Boris Novakovic, Kathrin Erler, Frank L van de Veerdonk, Hendrik G Stunnenberg, Mihai G Netea, Charles A Dinarello, Leo A B Joosten
Metabolic triggers are important inducers of the inflammatory processes in gout. Whereas the high serum urate levels observed in patients with gout predispose them to the formation of monosodium urate (MSU) crystals, soluble urate also primes for inflammatory signals in cells responding to gout-related stimuli, but also in other common metabolic diseases. In this study, we investigated the mechanisms through which uric acid selectively lowers human blood monocyte production of the natural inhibitor IL-1 receptor antagonist (IL-1Ra) and shifts production toward the highly inflammatory IL-1β...
May 8, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28469909/gout-in-primary-care-can-we-improve-patient-outcomes
#17
Jacqueline Callear, Georgina Blakey, Alexandra Callear, Linda Sloan
In the United Kingdom, gout represents one of the most common inflammatory arthropathies predominantly managed in the primary care setting. Gout is a red flag indicator for cardiovascular disease and comorbidity. Despite this, there are no incentivised treatment protocols and suboptimal management in the primary care setting is common. A computer based retrospective search at a large inner city GP practice between January 2014-December 2014 inclusive, identified 115 patients with gout. Baseline measurements revealed multiple gout related consultations, poor medication compliance, high uric acid levels and deficiencies in uric acid monitoring...
2017: BMJ Quality Improvement Reports
https://www.readbyqxmd.com/read/28469876/ammonium-acid-urate-urolithiasis-in-anorexia-nervosa-a-case-report-and-literature-review
#18
Mina Fukai, Tetsu Hirosawa, Hideo Nakatani, Tomoko Muramatsu, Mitsuru Kikuchi, Yoshio Minabe
Ammonium acid urate urolithiasis is a quite rare condition. Our literature review of ammonium acid urate urolithiasis suggests that ammonium acid urate urolithiasis should be regarded as a general medical complication related to anorexia nervosa, and purging by laxative abuse might be a crucially important risk.
May 2017: Clinical Case Reports
https://www.readbyqxmd.com/read/28467984/neutrophil-extracellular-traps-stimulate-proinflammatory-responses-in-human-airway-epithelial-cells
#19
Florencia Sabbione, Irene A Keitelman, Leonardo Iula, Mariana Ferrero, Mirta N Giordano, Pablo Baldi, Martín Rumbo, Carolina Jancic, Analía S Trevani
Tissue injury leads to the release of uric acid (UA). At high local concentrations, UA can form monosodium urate crystals (MSU). MSU and UA stimulate neutrophils to release extracellular traps (NET). Here, we investigated whether these NET could be involved in the development of inflammation by stimulating cytokine release by airway epithelial cells. We found that NET significantly increased the secretion of CXCL8/IL-8 and IL-6 by alveolar and bronchial epithelial cells. These effects were not observed when NETosis was inhibited by Diphenyleneiodonium, elastase inhibitor, or Cl-amidine...
May 4, 2017: Journal of Innate Immunity
https://www.readbyqxmd.com/read/28467476/early-onset-hyperuricemia-is-a-prognostic-marker-for-kidney-graft-failure-propensity-score-matching-analysis-in-a-korean-multicenter-cohort
#20
Miyeun Han, Jung Pyo Lee, Seokwoo Park, Yunmi Kim, Yong Chul Kim, Curie Ahn, Duck Jong Han, Jongwon Ha, In Mok Jung, Chun Soo Lim, Yon Su Kim, Young Hoon Kim, Yun Kyu Oh
It remains inconclusive whether hyperuricemia is a true risk factor for kidney graft failure. In the current study, we investigated the association of hyperuricemia and graft outcome. We performed a multi-center cohort study that included 2620 kidney transplant recipients. The patients were classified as either normouricemic or hyperuricemic at 3 months after transplantation. Hyperuricemia was defined as a serum uric acid level ≥ 7.0 mg/dL in males or ≥ 6.0 mg/dL in females or based on the use of urate-lowering medications...
2017: PloS One
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