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Uremic toxins

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https://www.readbyqxmd.com/read/29340842/application-of-automated-peritoneal-dialysis-in-urgent-start-peritoneal-dialysis-patients-during-the-break-in-period
#1
Shengmao Liu, Xiaohua Zhuang, Min Zhang, Yanfeng Wu, Min Liu, Sibo Guan, Shujun Liu, Lining Miao, Wenpeng Cui
OBJECTIVE: Whether automated peritoneal dialysis (APD) is a feasible strategy for urgent-start peritoneal dialysis (PD) therapy during the break-in period remains unclear. This study was conducted to compare the efficacy as well as complications among three PD modes during the break-in period. METHODS: Ninety-six patients treated with urgent-start PD after catheterization were retrospectively analyzed. Patients were divided into three groups, incremental continuous ambulatory PD (CAPD) group (n = 26); APD group (n = 42); and APD-CAPD group (n = 28)...
January 16, 2018: International Urology and Nephrology
https://www.readbyqxmd.com/read/29336911/-detection-and-characterization-of-shiga-toxin-producing-escherichia-coli-in-children-treated-at-an-inter-zonal-pediatric-hospital-in-the-city-of-la-plata
#2
Sebastián Oderiz, Gerardo A Leotta, Lucía Galli
Shiga toxin-producing Escherichia coli (STEC) is a foodborne pathogen that can cause watery diarrhea, bloody diarrhea (BD), and hemolytic uremic syndrome (HUS). The objective of this study was to determine the phenotypic and genotypic profiles of STEC strains isolated from children with BD and HUS treated at a pediatric hospital in the city of La Plata in the period 2006-2012, and to establish the clonal relationship of O157:H7 isolates by pulsed field electrophoresis. The percentage of positive samples was 4...
January 11, 2018: Revista Argentina de Microbiología
https://www.readbyqxmd.com/read/29316531/graphene-oxide-doping-improves-the-biocompatibility-and-separation-performance-of-polyethersulfone-hollow-fiber-membranes-for-bioartificial-kidney-application
#3
Akshay Modi, Surendra Kumar Verma, Jayesh Bellare
HYPOTHESIS: Graphene oxide (GO)-doping in polyethersulfone hollow fiber membranes (PES HFMs) improves the biocompatibility and separation performance for bioartificial kidney (BAK) application. EXPERIMENTS: GO was doped in PES HFMs. The physicochemical characterization of the developed HFMs was carried out. The biocompatibility tests including hemocompatibility and cytotoxicity tests, and separation experiments including uremic toxins clearance were performed. FINDINGS: GO-doping resulted in low hemolysis (0...
December 27, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29314251/clinical-and-hematological-data-to-group-different-chronic-kidney-disease-patients-a-practical-approach-to-establish-different-groups-of-patients
#4
Vinícius B Péterle, Jéssica de O Souza, Fernanda de O Busato, Frederico J Eutrópio, Gisele de A P da Costa, David N Olivieri, Carlos E Tadokoro
BACKGROUND: Chronic kidney disease (CKD) is the convergent point of several pathological processes, and its evolution is insidious and characterized by a progressive and irreversible loss of kidney function. This impaired function induces the accumulation of uremic toxins and individuals with terminal CKD often have altered physiological responses, including a persistent state of immuno-suppression and development of diseases. A better characterization and stratification of these patients with CKD in different immuno-compromised groups would contribute to more effective and personalized treatments...
January 4, 2018: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/29311647/-pro-renin-receptor-is-involved-in-mesangial-fibrosis-and-matrix-expansion
#5
Kaori Narumi, Emiko Sato, Takuo Hirose, Tae Yamamoto, Takashi Nakamichi, Mariko Miyazaki, Hiroshi Sato, Sadayoshi Ito
(Pro)renin receptor [(P)RR] is expressed in the kidney and is involved in renal injury. Although (P)RR is activated by indoxyl sulfate (IS) and may be related to renal injury, the details remain unclear. We used mouse mesangial cell line SV40 MES13 to investigate the association of (P)RR with mesangial fibrosis or expansion. Furthermore, we examined the correlation between serum soluble (P)RR [s(P)RR] and various laboratory data including serum IS, a uremic toxin that induces renal fibrosis through (P)RR, and pathological indices in chronic kidney disease and particularly in IgA nephropathy patients...
January 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29304774/assessment-of-the-association-between-increasing-membrane-pore-size-and-endotoxin-permeability-using-a-novel-experimental-dialysis-simulation-set-up
#6
Eva Schepers, Griet Glorieux, Sunny Eloot, Michael Hulko, Adriana Boschetti-de-Fierro, Werner Beck, Bernd Krause, Wim Van Biesen
BACKGROUND: Membranes with increasing pore size are introduced to enhance removal of large uremic toxins with regular hemodialysis. These membranes might theoretically have higher permeability for bacterial degradation products. In this paper, permeability for bacterial degradation products of membranes of comparable composition with different pore size was investigated with a new in vitro set-up that represents clinical flow and pressure conditions. METHODS: Dialysis was simulated with an AK200 machine using a low-flux, high-flux, medium cut-off (MCO) or high cut-off (HCO) device (n = 6/type)...
January 5, 2018: BMC Nephrology
https://www.readbyqxmd.com/read/29299983/metabolic-enzyme-system-and-transport-pathways-in-chronic-kidney-diseases
#7
Bin Liu, Fangmei Luo, Xiuju Luo, Shaobin Duan, Zhicheng Gong, Jie Peng
BACKGROUND: Chronic kidney disease (CKD), a global public health problem, affects numerous people worldwide, and the prevalence is rising. Results from animal experiments and clinical investigations have demonstrated that drug metabolic enzymes and transporters-mediated non-renal clearance is dramatically impaired in CKD, co-respondent with the alterations in the elimination of metabolized drugs. Accumulated uremic toxins may downregulate or directly inhibit the activity and/or the expression of drug metabolic enzymes and transporters, which may result in unintended alterations of drug exposure and response in cases when drugs dose are not adjusted for the renal dysfunction...
January 3, 2018: Current Drug Metabolism
https://www.readbyqxmd.com/read/29295767/-micro-inflammation-and-digestive-bacterial-translocation-in-chronic-kidney-disease
#8
Valérie Olivier, Catherine Dunyach-Remy, Jean-Philippe Lavigne, Olivier Moranne
Micro-inflammation has been recognized as a major factor associated with the poor prognosis of patients with chronic kidney disease. Those patients have an increased rate of pro-inflammatory markers like interleukin 6, C-Reactive protein, Tumor Necrosis Factor α and fibrinogen. Among multiple and complex causes of micro-inflammation the gut microbiota could be an important actor considering the dysbiosis in chronic kidney disease which would enhance the synthesis of uremic toxins with cardiovascular toxicity and the bacterial translocation...
December 30, 2017: Néphrologie & Thérapeutique
https://www.readbyqxmd.com/read/29290351/red-meat-intake-in-chronic-kidney-disease-patients-two-sides-of-the-coin
#9
REVIEW
Denise Mafra, Natalia A Borges, Ludmila Ferreira Medeiros de Franca Cardozo, Juliana S Anjos, Ana Paula Black, Cristiane Moraes, Peter Bergman, Bengt Lindholm, Peter Stenvinkel
Red meat is an important dietary source of high biological value protein and micronutrients such as vitamins, iron, and zinc that exert many beneficial functions. However, high consumption of animal protein sources, especially red meat, results in an increased intake of saturated fat, cholesterol, iron, and salt, as well as an excessive acid load. Red meat intake may lead to an elevated production of uremic toxins by the gut microbiota, such as trimethylamine n-oxide (TMAO), indoxyl sulfate, and p-cresyl sulfate...
February 2018: Nutrition
https://www.readbyqxmd.com/read/29285751/endogenous-metabolites-mediated-communication-between-oat1-oat3-and-oatp1b1-may-explain-the-association-between-slco1b1-snps-and-methotrexate-toxicity
#10
David Martinez, Kienana Muhrez, Jean-Baptiste Woillard, Aline Berthelot, Emmanuel Gyan, Sylvain Choquet, Christian R Andrès, Pierre Marquet, Chantal Barin-Le Guellec
Although OATP1B1 is not expressed in the kidney, polymorphisms in SLCO1B1 have been associated with methotrexate clearance or toxicity. This unexpected pharmacogenetic association may reflect remote communication between liver and kidney transporters. This study confirms the pharmacogenetic association with methotrexate toxicity in adult patients with hematological malignancies. Using a targeted urinary metabolomics approach, we identified 38 and 34 metabolites which were differentially excreted between wild-type and carriers of the c...
December 29, 2017: Clinical Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/29283413/impact-of-the-oral-adsorbent-ast-120-on-organ-specific-accumulation-of-uremic-toxins-lc-ms-ms-and-ms-imaging-techniques
#11
Emiko Sato, Daisuke Saigusa, Eikan Mishima, Taeko Uchida, Daisuke Miura, Tomomi Morikawa-Ichinose, Kiyomi Kisu, Akiyo Sekimoto, Ritsumi Saito, Yuji Oe, Yotaro Matsumoto, Yoshihisa Tomioka, Takefumi Mori, Nobuyuki Takahashi, Hiroshi Sato, Takaaki Abe, Toshimitsu Niwa, Sadayoshi Ito
Elevated circulating uremic toxins are associated with a variety of symptoms and organ dysfunction observed in patients with chronic kidney disease (CKD). Indoxyl sulfate (IS) and p-cresyl sulfate (PCS) are representative uremic toxins that exert various harmful effects. We recently showed that IS induces metabolic alteration in skeletal muscle and causes sarcopenia in mice. However, whether organ-specific accumulation of IS and PCS is associated with tissue dysfunction is still unclear. We investigated the accumulation of IS and PCS using liquid chromatography/tandem mass spectrometry in various tissues from mice with adenine-induced CKD...
December 28, 2017: Toxins
https://www.readbyqxmd.com/read/29273508/prevalence-quantification-and-isolation-of-pathogenic-shiga-toxin-escherichia-coli-o157-h7-along-the-production-and-supply-chain-of-pork-around-hubei-province-of-china
#12
Sher Bahadar Khan, Geng Zou, Ran Xiao, Yuting Cheng, Zia Ur Rehman, Sher Ali, Atta Muhammad Memon, Shah Fahad, Irshad Ahmad, Rui Zhou
Shiga toxin Escherichia coli (STEC) O157:H7 is an important zoonotic food borne pathogen causing gastroenteritis that may lead to life threatening hemorragic colitis (HC) and hemorrhagic uremic syndrome (HUS). 325 meat and tissue samples were tested for enumeration of O157:H7 strains using most probable number (MPN)-PCR targeting their specific genes flicH7 and rfbO157 followed by isolation, sereotyping and pathogenicity testing. The overall prevalence of O157:H7 was 41.3% (134/325) along the production and supply chain of pork (PSCP), being higher in supply chain (59%, 118/200) as compared to pig farms (12...
December 19, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29248444/excitotoxicity-in-encephalopathy-associated-with-stec-o-157-infection
#13
Shigenobu Ishida, Kumi Yasukawa, Mai Koizumi, Katsuhiro Abe, Nozomi Hirai, Takafumi Honda, Hiroshi Sakuma, Hiroko Tada, Jun-Ichi Takanashi
Cytokines play an important role in the pathogenesis of the severe complications of Shiga toxin-producing Escherichia coli (STEC) infection, such as hemolytic uremic syndrome (HUS) and acute encephalopathy. A 3-year-old boy with acute encephalopathy associated with STEC O-157 HUS showed increased levels of IL-6 and IL-10, which normalized after methylprednisolone pulse therapy, and additionally exhibited a transient increase of glutamine on MR spectroscopy. This finding suggests that excitotoxicity, in addition to hypercytokinemia, may play an important role in the pathogenesis of HUS encephalopathy...
December 13, 2017: Brain & Development
https://www.readbyqxmd.com/read/29222397/indoxyl-sulfate-upregulates-liver-p-glycoprotein-expression-and-activity-through-aryl-hydrocarbon-receptor-signaling
#14
Tacy Santana Machado, Stéphane Poitevin, Pascale Paul, Nathalie McKay, Noémie Jourde-Chiche, Tristan Legris, Annick Mouly-Bandini, Françoise Dignat-George, Philippe Brunet, Rosalinde Masereeuw, Stéphane Burtey, Claire Cerini
In patients with CKD, not only renal but also, nonrenal clearance of drugs is altered. Uremic toxins could modify the expression and/or activity of drug transporters in the liver. We tested whether the uremic toxin indoxyl sulfate (IS), an endogenous ligand of the transcription factor aryl hydrocarbon receptor, could change the expression of the following liver transporters involved in drug clearance: SLC10A1, SLC22A1, SLC22A7, SLC47A1, SLCO1B1, SLCO1B3, SLCO2B1, ABCB1, ABCB11, ABCC2, ABCC3, ABCC4, ABCC6, and ABCG2 We showed that IS increases the expression and activity of the efflux transporter P-glycoprotein (P-gp) encoded by ABCB1 in human hepatoma cells (HepG2) without modifying the expression of the other transporters...
December 8, 2017: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/29216383/genetic-susceptibility-to-hemolytic-uremic-syndrome-after-shiga-toxin-producing-escherichia-coli-stec-infection-a-centers-for-disease-control-and-prevention-cdc-foodnet-study
#15
Asha R Kallianpur, Yuki Bradford, Rajal K Mody, Katie N Garman, Nicole Comstock, Sarah L Lathrop, Carol Lyons, Amy Saupe, Katie Wymore, Jeffrey A Canter, Lana M Olson, Amanda Palmer, Timothy F Jones
Background: Post-diarrheal hemolytic-uremic syndrome (D+HUS) following Shiga toxin-producing Escherichia coli (STEC) infection is a serious condition lacking specific treatment. Host immune dysregulation and genetic susceptibility to complement hyperactivation are implicated in non-STEC-related HUS. However, genetic susceptibility to D+HUS remains largely uncharacterized. Methods: Patients with culture-confirmed STEC diarrhea, identified through the CDC FoodNet surveillance system (2007-2012), were serotyped and classified by laboratory and/or clinical criteria as suspected, probable, or confirmed D+HUS, or as controls and genotyped at 200 loci linked to non-diarrheal HUS or similar pathologies...
December 6, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29214717/bisphenol-a-is-an-exogenous-toxin-that-promotes-mitochondrial-injury-and-death-in-tubular-cells
#16
Enrique Bosch-Panadero, Sebastian Mas, Esther Civantos, Pedro Abaigar, Vanesa Camarero, Alberto Ruiz-Priego, Alberto Ortiz, Jesus Egido, Emilio González-Parra
BACKGROUND: Uremic toxins that accumulate in chronic kidney disease (CKD) contribute to CKD complications, such as CKD progression. Bisphenol A (BPA) is a ubiquitous environmental toxin, structurally related with p-cresol, that accumulates in CKD. Our aim was to characterize the nephrotoxic potential of BPA. Specifically, we addressed BPA toxicity over energy-demanding proximal tubular cells. METHODS: Cell death and oxidative stress were evaluated by flow cytometry and confocal microscopy in HK-2 human proximal tubular epithelial cells...
December 7, 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/29214442/shiga-toxin-triggers-endothelial-and-podocyte-injury-the-role-of-complement-activation
#17
REVIEW
Carlamaria Zoja, Simona Buelli, Marina Morigi
Shiga toxin (Stx)-producing Escherichia coli (STEC) is the offending agent in post-diarrhea-associated hemolytic uremic syndrome (HUS), a disorder characterized by thrombocytopenia, microangiopathic hemolytic anemia, and acute kidney failure, with thrombi occluding the renal microvasculature. Endothelial dysfunction has been recognized as the trigger event in the development of microangiopathic processes. Glomerular endothelial cells are susceptible to the toxic effects of Stxs that, via nuclear factor kappa B (NF-κB) activation, induce the expression of genes encoding for adhesion molecules and chemokines, culminating in leukocyte adhesion and platelet thrombus formation on the activated endothelium...
December 6, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/29207222/urea-and-impairment-of-the-gut-kidney-axis-in-chronic-kidney-disease
#18
REVIEW
Biagio Raffaele Di Iorio, Stefania Marzocco, Luca Nardone, Marilisa Sirico, Emanuele De Simone, Gabriella Di Natale, Lucia Di Micco
Gut microbiota can be considered a real organ coordinating health and wellness of our body. It is made of more than 100 trillions of microorganisms, thus about 3 times higher than the number of human body cells and more than 150 times than human genes containing 1000 different microbe species. It has been described a symbiotic relationship between gut and kidney, confirmed by several observations. This is a bi-directional relation with a mutual influence, even when kidney disease occurs, and consequent alterations of intestinal microbiota and production of uremic toxins, that in turn worsens kidney disease and its progression...
December 5, 2017: Giornale Italiano di Nefrologia: Organo Ufficiale Della Società Italiana di Nefrologia
https://www.readbyqxmd.com/read/29203210/indoxyl-sulfate-upregulates-the-cannabinoid-type-1-receptor-gene-via-an-atf3-c-jun-complex-mediated-signaling-pathway-in-the-model-of-uremic-cardiomyopathy
#19
Yu-Juei Hsu, Shih-Che Hsu, Yung-Lung Chang, Shih-Ming Huang, Chun-Che Shih, Chien-Sung Tsai, Chih-Yuan Lin
BACKGROUND: The risk of cardiovascular disease is notably increased in patients with chronic kidney disease (CKD) and cannabinoid receptor type 1 (CB1R) plays an important role in the development of uremic cardiomyopathy. However, the molecular mechanism underlying the uremic toxin-induced upregulation of CB1R remains elusive. METHODS: The expression of the ATF3/c-Jun complex and CB1R in both in vivo and in vitro models of CKD were measured. We also determined the impact of the ATF3/c-Jun complex on CB1R expression by transfecting H9c2 cells with dominant negative mutants of ATF3 or c-Jun...
December 1, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/29195902/indoxyl-sulfate-accelerates-vascular-smooth-muscle-cell-calcification-via-microrna-29b-dependent-regulation-of-wnt-%C3%AE-catenin-signaling
#20
Han Zhang, Jing Chen, Ziyan Shen, Yulu Gu, Linghan Xu, Jiachang Hu, Xiaoyan Zhang, Xiaoqiang Ding
Vascular calcification (VC) is a very common phenomenon in patients with chronic kidney disease(CKD) and it increases the incidence of cardiovascular disease and leads to high mortality in CKD patients. It has been reported that some microRNAs (miRs) play roles in vascular calcification as an epigenetic regulator. Indoxyl sulfate (IS) is a protein-bound uremic toxin which has been proven as one of the major risk factors of cardiovascular disease in CKD. Here we investigated whether microRNA-29b (miR-29b) is involved in IS-induced vascular calcification...
November 28, 2017: Toxicology Letters
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