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https://www.readbyqxmd.com/read/29352206/omega-3-carboxylic-acids-provide-efficacious-anti-inflammatory-activity-in-models-of-crystal-mediated-inflammation
#1
Cory Iverson, Andrew Bacong, Sha Liu, Scott Baumgartner, Torbjörn Lundström, Jan Oscarsson, Jeffrey N Miner
This study assesses the efficacy and exposure-response relationship of omega-3-carboxylic acids (OM-3 CA) in models of crystal-based inflammation. Human THP-1 macrophages and primary peripheral blood mononuclear cells exposed to multiple inflammatory crystal types were used to determine the anti-inflammatory potential of omega-3 (OM-3) fatty acids in vitro. Anti-inflammatory effects of OM-3 CA in vivo were tested in rat monosodium urate (MSU) crystal air pouch and rat knee intra-articular MSU injection models...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29350330/role-of-dual-energy-ct-in-the-diagnosis-and-follow-up-of-gout-systematic-analysis-of-the-literature
#2
André Ramon, Amélie Bohm-Sigrand, Pierre Pottecher, Pascal Richette, Jean-Francis Maillefert, Herve Devilliers, Paul Ornetti
The aim of this systematic review was to determine the potential role of dual-energy CT in the diagnosis and follow-up of gout with regard to the Outcome Measures in Rheumatology (OMERACT) filter. A systematic analysis of the literature was conducted using the MEDLINE and Cochrane databases and published abstracts of international congresses, according to the criteria of the OMERACT filter: feasibility, reproducibility, validity versus laboratory (serum urate, MSU synovial fluid aspirate) and other imaging modalities for gout, and its sensitivity to change in patients on urate lowering therapy (ULT)...
January 19, 2018: Clinical Rheumatology
https://www.readbyqxmd.com/read/29345102/the-mycobiota-of-the-sand-fly-phlebotomus-perniciosus-involvement-of-yeast-symbionts-in-uric-acid-metabolism
#3
Elena Martin, Ilaria Varotto Boccazzi, Leone De Marco, Gioia Bongiorno, Matteo Montagna, Luciano Sacchi, Priscilla Mensah, Irene Ricci, Luigi Gradoni, Claudio Bandi, Sara Epis
The knowledge of the fungal mycobiota of arthropods, including the vectors of human and animal diseases, is still limited. Here, we investigated the mycobiota associated with the sand fly Phlebotomus perniciosus, the main vector of leishmaniasis in the western Mediterranean area, by a culture-dependent approach (microbiological analyses and sequencing of the 26S rRNA gene), internal transcribed spacer (ITS) rRNA amplicon-based next-generation sequencing, fluorescence in situ hybridisation (FISH), and genome sequencing of the dominant yeast species...
January 18, 2018: Environmental Microbiology
https://www.readbyqxmd.com/read/29342419/investigation-of-the-transport-of-xanthine-dehydrogenase-inhibitors-by-the-urate-transporter-abcg2
#4
Makiko Nakamura, Kyoko Fujita, Yu Toyoda, Tappei Takada, Hiroshi Hasegawa, Kimiyoshi Ichida
Hyperuricemia induces gout and kidney stones and accelerates the progression of renal and cardiovascular diseases. Adenosine 5'-triphosphate-binding cassette subfamily G member 2 (ABCG2) is a urate transporter, and common dysfunctional variants of ABCG2, non-functional Q126X (rs72552713) and semi-functional Q141K (rs2231142), are risk factors for hyperuricemia and gout. A recent genome wide association study suggested that allopurinol, a serum uric acid-lowering drug that inhibits xanthine dehydrogenase, is a potent substrate of ABCG2...
November 22, 2017: Drug Metabolism and Pharmacokinetics
https://www.readbyqxmd.com/read/29342288/association-between-abcg2-rs2231142-and-poor-response-to-allopurinol-replication-and-meta-analysis
#5
Mary C Wallace, Rebecca L Roberts, Payal Nanavati, Jeffrey N Miner, Nicola Dalbeth, Ruth Topless, Tony R Merriman, Lisa K Stamp
Objective: ABCG2 rs2231142 (Q141K) has been reported to be associated with poor response to allopurinol, while there are conflicting data on the association between the genetically independent ABCG2 rs10011796 variant and allopurinol response. The aim of this study was to replicate the association of ABCG2 rs2231142 and rs10011796 with allopurinol response and perform a meta-analysis. Methods: Participants in the Long-term Allopurinol Safety Study Evaluating Outcomes in Gout Patients (LASSO) (n = 299) were studied...
January 12, 2018: Rheumatology
https://www.readbyqxmd.com/read/29341237/the-impact-of-diuretic-use-and-abcg2-genotype-on-the-predictive-performance-of-a-published-allopurinol-dosing-tool
#6
Daniel F B Wright, Nicola Dalbeth, Amanda J Phipps-Green, Tony R Merriman, Murray L Barclay, Jill Drake, Paul Tan, Anne Horne, Lisa K Stamp
This research aims to evaluate the predictive performance of a published allopurinol dosing tool. Allopurinol dose predictions were compared to the actual dose required to achieve serum urate (SU) <0.36 mmol L-1 using mean prediction error. The influence of patient factors on dose predictions was explored using multilinear regression. Allopurinol doses were over-predicted by the dosing tool, however, this was minimal in patients without diuretic therapy (MPE 63mg day-1 , 95%CI 40-87) compared to those receiving diuretics (MPE 295mg day-1 , 95%CI 260-330, p<0...
January 17, 2018: British Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/29340054/febuxostat-attenuates-er-stress-mediated-kidney-injury-in-a-rat-model-of-hyperuricemic-nephropathy
#7
Li He, Ying Fan, Wenzhen Xiao, Teng Chen, Jiejun Wen, Yang Dong, Yiyun Wang, Shiqi Li, Rui Xue, Liyang Zheng, John Cijiang He, Niansong Wang
Hyperuricemia contributes to kidney tubular injury and kidney fibrosis. However, the underlying mechanism remains unclear. Here we examined the role of RTN1A, a novel endoplasmic reticulum (ER)-associated protein and ER stress in hyperuricemic nephropathy. We first found the expression of RTN1A and ER stress markers was significantly increased in kidney biopsies of hyperuricemia patients with kidney injury. In a rat model of hyperuricemic nephropathy (HN) established by oral administration of a mixture of adenine and potassium oxonate, increased expression of RTN1A and ER stress was shown in tubular and interstitial compartment of rat kidneys...
December 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/29339978/increase-of-somatic-cell-mutations-in-oxidative-damage-sensitive-drosophila
#8
Ryota Koike, Tomoyo Uchiyama, Sakae Arimoto-Kobayashi, Keinosuke Okamoto, Tomoe Negishi
Background: Oxidative damage is an important genotoxic source for almost all organisms. To efficiently detect mutations induced by oxidative damage, we previously developed a urate-null Drosophila strain. Using this Drosophila strain, we showed the mutagenic activity of environmental cigarette smoke (ECS) and the herbicide paraquat, which are known to produce reactive oxygen species (ROS). In the present study, we examined the mutagenic activities of carcinogenic mutagens that are considered to cause mutations by adduct formation, alkylation, or crosslinking of cellular DNA in the oxidative damage-sensitive Drosophila to evaluate how the oxidative damage induced by these mutagens is involved in causing mutations...
2018: Genes and Environment: the Official Journal of the Japanese Environmental Mutagen Society
https://www.readbyqxmd.com/read/29333512/fourier-transform-infrared-spectroscopy-for-analysis-of-kidney-stones
#9
Aysha Habib Khan, Sheharbano Imran, Jamsheer Talati, Lena Jafri
Purpose: To compare the results of a chemical method of kidney stone analysis with the results of Fourier transform infrared (FT-IR) spectroscopy. Materials and Methods: Kidney stones collected between June and October 2015 were simultaneously analyzed by chemical and FT-IR methods. Results: Kidney stones (n=449) were collected from patients from 1 to 81 years old. Most stones were from adults, with only 11.5% from children (aged 3-16 years) and 1...
January 2018: Investigative and Clinical Urology
https://www.readbyqxmd.com/read/29330993/chemical-composition-of-stones-in-paediatric-urolithiasis
#10
Kiran Imran, Mirza Naqi Zafar, Naureen Fatima, Uzma Ozair, Sajid Sultan, Syed Adibul Hasan Rizvi
BACKGROUND: Chemical composition of stones is one of the important diagnostic criteria for aetiology of stone formation and treatment to prevent recurrence. This paper reports composition of stones in children at a tertiary hospital by Fourier Transformation Infrared Spectroscopy (FTIR). METHODS: Between January-June 2015, 412 urinary stones from children were analysed by FTIR. Chi-square tests were used for the comparison of categorical measurements between groups...
October 2017: Journal of Ayub Medical College, Abbottabad: JAMC
https://www.readbyqxmd.com/read/29326278/an-update-on-the-management-of-gout
#11
(no author information available yet)
Gout is the most common form of inflammatory arthritis and its incidence in the UK has steadily increased from 1.5% in 1997 to 2.5% in 2012.1,2 It is characterised by deposition of monosodium urate crystals in joints and tissues and usually presents with intermittent painful attacks followed by long periods of remission.3 It has been suggested that the management of gout in the UK remains suboptimal.1 In 2004, we concluded that there was a woeful lack of evidence to guide treatment or prophylaxis for gout, particularly with regard to choice of drug or doses...
January 2018: Drug and Therapeutics Bulletin
https://www.readbyqxmd.com/read/29325307/-the-clinical-characteristics-diagnosis-and-treatment-of-patients-with-gout-in-china
#12
H Luo, W G Fang, X X Zuo, R Wu, X X Li, J W Chen, J G Zhou, J Yang, H Song, X J Duan, X F Lin, X W Zeng, H Zeng
Objective: To investigate the demographic characteristics, clinical features, diagnosis and treatment of patients with gout in China. Methods: Clinical data of 6 814 patients with gout from 100 hospitals in 27 provinces, municipalities or autonomous regions in China were collected and analyzed. Results: (1) The ratio of male to female in patients with gout was 14.7∶1. The mean age of onset was (48.8±15.1) years old. Mean serum urate level was (526.7±132.3) μmol/L. Patients' education background was of U-shaped distribution; (2) Hypertension was the most common comorbidity [15...
January 1, 2018: Zhonghua Nei Ke za Zhi [Chinese Journal of Internal Medicine]
https://www.readbyqxmd.com/read/29320954/the-value-of-fixed-rasburicase-dosing-versus-weight-based-dosing-in-the-treatment-and-prevention-of-tumor-lysis-syndrome
#13
Alyssa Boutin, Alison Blackman, David M O'Sullivan, Nicholas Forcello
Background Rasburicase is a recombinant urate oxidase enzyme used for the treatment and prevention of tumor lysis syndrome. Our objective was to assess the efficacy of indication-based, low-dose rasburicase administration compared to the Food and Drug Administration-approved weight-based dosing. Methods This was a retrospective cohort study utilizing data from a tertiary medical center including patients admitted from 2012 to 2016, who received at least one dose of rasburicase. The primary outcome was achieving a uric acid level less than 7...
January 1, 2018: Journal of Oncology Pharmacy Practice
https://www.readbyqxmd.com/read/29319609/joint-nociceptor-nerve-activity-and-pain-in-an-animal-model-of-acute-gout-and-its-modulation-by-intra-articular-hyaluronan
#14
Aida Marcotti, Ana Miralles, Eduardo Dominguez, Eliseo Pascual, Ana Gomis, Carlos Belmonte, Elvira de la Peña
The mechanisms whereby monosodium urate (MSU) crystals deposition in gout activate nociceptors to induce joint pain are incompletely understood. We tried to reproduce the signs of painful gouty arthritis, injecting into the knee joint of rats suspensions containing amorphous or triclinic, needle MSU crystals. The magnitude of MSU-induced inflammation and pain behavior signs was correlated with the changes in firing frequency of spontaneous and movement-evoked nerve impulse activity recorded in single knee joint nociceptor saphenous nerve fibers...
January 9, 2018: Pain
https://www.readbyqxmd.com/read/29317200/hyperuricemia-enhances-intracellular-urate-accumulation-via-down-regulation-of-cell-surface-bcrp-abcg2-expression-in-vascular-endothelial-cells
#15
Hisakazu Komori, Kazuyuki Yamada, Ikumi Tamai
Hyperuricemia has been recognized as an independent risk factor for cardiovascular disease. Urate stimulates NADPH oxidase and induces production of reactive oxygen species (ROS); consequently, intracellular urate accumulation can induce oxidative stress leading to endothelial dysfunction. Here, we studied the mechanism involved, using human umbilical vascular endothelial cells (HUVEC) as a model. Pretreatment with 15mg/dL unlabeled uric acid (corresponding to hyperuricemia) resulted in increased uptake of [14C]uric acid at steady-state by HUVEC, whereas pretreatment with 5mg/dL uric acid (in the normal serum concentration range) did not...
January 6, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29288369/assessment-of-cardiovascular-risk-profile-based-on-measurement-of-tophus-volume-in-patients-with-gout
#16
Kyung-Ann Lee, Se-Ri Ryu, Seong-Jun Park, Hae-Rim Kim, Sang-Heon Lee
Hyperuricemia and gout are associated with increased risk of cardiovascular disease and metabolic syndrome. The aim of this study was to evaluate the correlation of total tophus volumes, measured using dual-energy computed tomography, with cardiovascular risk and the presence of metabolic syndrome. Dual-energy computed tomography datasets from 91 patients with a diagnosis of gout were analyzed retrospectively. Patients who received urate lowering therapy were excluded to avoid the effect on tophus volume. The total volumes of tophaceous deposition were quantified using automated volume assessment software...
December 29, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/29279328/hydrogen-sulfide-inhibits-the-nlrp3-inflammasome-and-reduces-cytokine-production-both-in-vitro-and-in-a-mouse-model-of-inflammation
#17
Mariela Castelblanco, Jérôme Lugrin, Driss Ehirchiou, Sonia Nasi, Isao Ishii, Alexander So, Fabio Martinon, Nathalie Busso
A variety of stimuli, including monosodium urate (MSU) crystals, activate the NLRP3 inflammasome, and this activation involves several molecular mechanisms including xanthine oxidase (XO) upregulation and mitochondrial dysfunction. Upon oligomerization of apoptosis-associated speck-like protein containing a CARD (ASC), caspase-1 becomes active and cleaves the proinflammatory cytokine IL-1β into its active secreted form. Hydrogen sulfide (H2S), a gasotransmitter mainly produced by cystathionine γ-lyase (CSE) in macrophages, could modulate inflammation...
December 26, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29277881/quantitative-mineralogical-composition-of-calculi-and-urine-abnormalities-for-calcium-oxalate-stone-formers-a-single-center-results
#18
Andrey V Kustov, Alexander I Strelnikov
PURPOSE: The paper focuses on the relationship of risk factors and metabolic disorders with mineralogical composition of calculi, age and gender of calcium oxalate stone formers. MATERIALS AND METHODS: Stone mineralogical composition, 24 hour biochemistry and pH-profile of urine were examined for sixty four stone formers using powder X-ray diffraction, spectrophotometric and potentiometric techniques. RESULTS: The analysis indicated that 44 % of calculi were composed of pure calcium oxalate monohydrate, whereas other 56 % contained both monohydrate and dihydrate or usually their mixtures with hydroxyl apatite...
December 26, 2017: Urology Journal
https://www.readbyqxmd.com/read/29277115/pre-diagnostic-plasma-urate-and-the-risk-of-amyotrophic-lateral-sclerosis
#19
Éilis J O'Reilly, Kjetil Bjornevik, Michael A Schwarzschild, Marjorie L McCullough, Laurence N Kolonel, Loic Le Marchand, Joann E Manson, Alberto Ascherio
OBJECTIVE: To prospectively examine for the first time the association between plasma urate levels measured in healthy participants and future amyotrophic lateral sclerosis (ALS) risk. METHODS: A pooled case-control study nested in five US prospective cohorts comprising 319,617 participants who provided blood, of which 275 had ALS during follow-up. Pre-diagnostic plasma urate was determined for all participants using a clinical colorimetric enzyme assay. Gender-specific multivariable-adjusted rate ratios (RR) of ALS incidence or death estimated by conditional logistic regression and pooled using inverse-variance weighting...
December 26, 2017: Amyotrophic Lateral Sclerosis and Frontotemporal Degeneration
https://www.readbyqxmd.com/read/29274344/calcium-phosphate-particles-stimulate-interleukin-1%C3%AE-release-from-human-vascular-smooth-muscle-cells-a-role-for-spleen-tyrosine-kinase-and-exosome-release
#20
Yana Dautova, Alexander N Kapustin, Kevin Pappert, Matthias Epple, Hanneke Okkenhaug, Simon J Cook, Catherine M Shanahan, Martin D Bootman, Diane Proudfoot
AIMS: Calcium phosphate (CaP) particle deposits are found in several inflammatory diseases including atherosclerosis and osteoarthritis. CaP, and other forms of crystals and particles, can promote inflammasome formation in macrophages leading to caspase-1 activation and secretion of mature interleukin-1β (IL-1β). Given the close association of small CaP particles with vascular smooth muscle cells (VSMCs) in atherosclerotic fibrous caps, we aimed to determine if CaP particles affected pro-inflammatory signalling in human VSMCs...
December 20, 2017: Journal of Molecular and Cellular Cardiology
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