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Uremic toxins

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https://www.readbyqxmd.com/read/28107445/beta-glucans-supplementation-associates-with-reduction-in-p-cresyl-sulfate-levels-and-improved-endothelial-vascular-reactivity-in-healthy-individuals
#1
Carmela Cosola, Maria De Angelis, Maria Teresa Rocchetti, Eustacchio Montemurno, Valentina Maranzano, Giuseppe Dalfino, Carlo Manno, Annapaola Zito, Michele Gesualdo, Marco Matteo Ciccone, Marco Gobbetti, Loreto Gesualdo
BACKGROUND: Oat and barley beta-glucans are prebiotic fibers known for their cholesterol-lowering activity, but their action on the human gut microbiota metabolism is still under research. Although the induction of short-chain fatty acids (SCFA) following their ingestion has previously been reported, no study has investigated their effects on proteolytic uremic toxins p-cresyl sulfate (pCS) and indoxyl sulfate (IS) levels, while others have failed to demonstrate an effect on the endothelial function measured through flow-mediated dilation (FMD)...
2017: PloS One
https://www.readbyqxmd.com/read/28089476/serum-asymmetric-and-symmetric-dimethylarginine-and-morbidity-and-mortality-in-hemodialysis-patients
#2
Tariq Shafi, Thomas H Hostetter, Timothy W Meyer, Seungyoung Hwang, Xin Hai, Michal L Melamed, Tanushree Banerjee, Josef Coresh, Neil R Powe
BACKGROUND: Asymmetric (ADMA) and symmetric dimethylarginine (SDMA) are putative uremic toxins that may exert toxicity by a number of mechanisms, including impaired nitric oxide synthesis and generation of reactive oxygen species. The study goal was to determine the association between these metabolites and cardiovascular outcomes in hemodialysis patients. STUDY DESIGN: Post hoc analysis of the Hemodialysis (HEMO) Study. SETTING & PARTICIPANTS: 1,276 prevalent hemodialysis patients with available samples 3 to 6 months after randomization...
January 12, 2017: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/28089366/limited-reduction-in-uremic-solute-concentrations-with-increased-dialysis-frequency-and-time-in-the-frequent-hemodialysis-network-daily-trial
#3
Tammy L Sirich, Kara Fong, Brett Larive, Gerald J Beck, Glenn M Chertow, Nathan W Levin, Alan S Kliger, Natalie S Plummer, Timothy W Meyer
The Frequent Hemodialysis Network Daily Trial compared conventional three-times weekly treatment to more frequent treatment with a longer weekly treatment time in patients receiving in-center hemodialysis. Evaluation at one year showed favorable effects of more intensive treatment on left ventricular mass, blood pressure, and phosphate control, but modest or no effects on physical or cognitive performance. The current study compared plasma concentrations of uremic solutes in stored samples from 53 trial patients who received three-times weekly in-center hemodialysis for an average weekly time of 10...
January 12, 2017: Kidney International
https://www.readbyqxmd.com/read/28077371/markers-of-endothelial-damage-in-patients-with-chronic-kidney-disease-on-hemodialysis
#4
Andrés Carmona, Maria Luisa Agüera, Carlos Luna Ruiz, Paula Buendia, Laura Calleros, Andrea Garcia-Jerez, Manuel Rodríguez-Puyol, Manuel Arias, Marta Arias-Guillen, Gabriel de Arriba, Jose Ballarin, Carmen Bernis, Elvira Fernandez, Sagrario Garcia-Rebollo, Javier Mancha, Gloria Del Peso, Estefania Perez, Esteban Poch, Jose M Portoles, Diego Rodriguez-Puyol, Rafael Sánchez-Villanueva, Felipe Sarro, Armando Torres, Alejandro Martin-Malo, Pedro Aljama, Rafael Ramirez, Julia Carracedo
Patients with stage 5 chronic kidney disease who are on hemodialysis (HD) remain in a chronic inflammatory state, characterized by the accumulation of uremic toxins that induce endothelial damage and cardiovascular disease (CVD). Our aim was to examine microvesicles (MVs), monocyte subpopulations, and angiopoietins to identify prognostic markers in HD patients with or without diabetes mellitus (DM). A total of 160 prevalent HD patients from 10 centers across Spain were obtained from the Biobank of the Nephrology Renal Network (REDinREN, Madrid): 80 patients with diabetes mellitus (DM) and 80 patients without DM who were matched for clinical and demographic criteria...
January 11, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28075397/the-sulfur-metabolite-lanthionine-evidence-for-a-role-as-a-novel-uremic-toxin
#5
REVIEW
Alessandra F Perna, Miriam Zacchia, Francesco Trepiccione, Diego Ingrosso
Lanthionine is a nonproteinogenic amino acid, composed of two alanine residues that are crosslinked on their β-carbon atoms by a thioether linkage. It is biosynthesized from the condensation of two cysteine molecules, while the related compound homolanthionine is formed from the condensation of two homocysteine molecules. The reactions can be carried out by either cystathionine-β-synthase (CBS) or cystathionine-γ-lyase (CSE) independently, in the alternate reactions of the transsulfuration pathway devoted to hydrogen sulfide biosynthesis...
January 10, 2017: Toxins
https://www.readbyqxmd.com/read/28067862/impact-of-indoxyl-sulfate-on-progenitor-cell-related-neovascularization-of-peripheral-arterial-disease-and-post-angioplasty-thrombosis-of-dialysis-vascular-access
#6
REVIEW
Chih-Cheng Wu, Szu-Chun Hung, Ko-Lin Kuo, Der-Cherng Tarng
Patients with chronic kidney disease (CKD) have an increased risk of vascular disease, which is associated with considerable health care costs. Vascular disease in CKD differs clinically and pathobiologically from that in patients with normal renal function. Besides the traditional risk factors, retention of uremic toxins contributes to the pathogenesis of vascular disease in patients with CKD. Indoxyl sulfate is a protein-bound uremic toxin and is inefficiently removed by conventional dialysis. Accumulating evidence suggests that indoxyl sulfate is a vascular toxin involved in atherosclerosis, arteriosclerosis, vascular calcification and vascular repair...
January 7, 2017: Toxins
https://www.readbyqxmd.com/read/28067473/role-of-uremic-toxins-on-apoptosis-with-varying-periods-of-hemodialysis
#7
Zeynep Hünkerler, Tülay Köken, Buğra Koca, Ahmet Kahraman
Increased apoptotic cell death in uremic patients has been confirmed by a variety of studies. The present study aimed to investigate the effect of uremic toxins and duration of hemodialysis (HD) therapy on apoptosis by means of measuring serum caspase cleaved CK18 (CCCK-18) levels. Seventy chronic HD patients were recruited and divided into three groups with differing periods of HD, from 6 months to 10 years. Twelve healthy subjects served as controls. Serum CCCK-18 level was found significantly higher in HD patient groups (Group 2; 189 ± 71 IU/L, Group 3; 182 ± 65 IU/L, Group 4; 204 ± 111 IU/L) as compared to the control group (122 ± 20 U/L) (P < 0...
January 9, 2017: Therapeutic Apheresis and Dialysis
https://www.readbyqxmd.com/read/28062285/a-review-on-strategies-for-decreasing-e-%C3%A2-coli-o157-h7-risk-in-animals
#8
REVIEW
Pardis Saeedi, Maryam Yazdanparast, Elham Behzadi, Ali Hatef Salmanian, Seyed Latif Mousavi, Shahram Nazarian, Jafar Amani
Enterohemorrhagic Escherichia coli (EHEC) serotype O157:H7 is a food-borne pathogen that younger children are most prone to this microorganism. Hemolytic Uremic Syndrome (HUS) caused by EHEC, leads to the destruction of red blood cells and kidney failure. The virulence of E.coli O157:H7 is attributed to fimbriae, that facilitate colonization of bacteria within the colon and verotoxins (VT) or Shiga toxins (Stx) that are released into the blood. Although, in most cases, the infection is self-limitedin young children and aged population, it may cause HUS...
January 3, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28057514/systemic-effects-of-subtilase-cytotoxin-produced-by-escherichia-coli-o113-h21
#9
E Abril Seyahian, Gisela Oltra, Federico Ochoa, Santiago Melendi, Ricardo Hermes, James C Paton, Adrienne W Paton, Nestor Lago, Mauricio Castro Parodi, Alicia Damiano, Cristina Ibarra, Elsa Zotta
: Subtilase cytotoxin (SubAB) is a member of the AB5 cytotoxin family and is produced by certain strains of Shiga toxigenic Escherichia coli. The toxin is known to be lethal to mice, but the pathological mechanisms that contribute to Uremic Hemolytic Syndrome (HUS) are poorly understood. In this study we show that intraperitoneal injection of a sublethal dose of SubAB in rats triggers a systemic response, with ascitic fluid accumulation, heart hypertrophy and damage to the liver, colon and kidney...
January 3, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28042026/dexamethasone-prevents-motor-deficits-and-neurovascular-damage-produced-by-shiga-toxin-2-and-lipopolysaccharide-in-the-mouse-striatum
#10
Alipio Pinto, Adriana Cangelosi, Patricia A Geoghegan, Jorge Goldstein
Shiga toxin 2 (Stx2) from enterohemorrhagic Escherichia coli (EHEC) causes bloody diarrhea and Hemolytic Uremic Syndrome (HUS) that may derive to fatal neurological outcomes. Neurological abnormalities in the striatum are frequently observed in affected patients and in studies with animal models while motor disorders are usually associated with pyramidal and extra pyramidal systems. A translational murine model of encephalopathy was employed to demonstrate that systemic administration of a sublethal dose of Stx2 damaged the striatal microvasculature and astrocytes, increase the blood brain barrier permeability and caused neuronal degeneration...
December 30, 2016: Neuroscience
https://www.readbyqxmd.com/read/28025487/indoxyl-sulfate-as-a-mediator-involved-in-dysregulation-of-pulmonary-aquaporin-5-in-acute-lung-injury-caused-by-acute-kidney-injury
#11
Nozomi Yabuuchi, Masataka Sagata, Chika Saigo, Go Yoneda, Yuko Yamamoto, Yui Nomura, Kazuhiko Nishi, Rika Fujino, Hirofumi Jono, Hideyuki Saito
High mortality of acute kidney injury (AKI) is associated with acute lung injury (ALI), which is a typical complication of AKI. Although it is suggested that dysregulation of lung salt and water channels following AKI plays a pivotal role in ALI, the mechanism of its dysregulation has not been elucidated. Here, we examined the involvement of a typical oxidative stress-inducing uremic toxin, indoxyl sulfate (IS), in the dysregulation of the pulmonary predominant water channel, aquaporin 5 (AQP-5), in bilateral nephrectomy (BNx)-induced AKI model rats...
December 23, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28006782/indoxyl-sulfate-impairs-endothelial-progenitor-cells-and-might-contribute-to-vascular-dysfunction-in-patients-with-chronic-kidney-disease
#12
Cheng-Jui Lin, Chih-Jen Wu, Pei-Chen Wu, Chi-Feng Pan, Tuan-Jen Wang, Fang-Ju Sun, Hsuan-Liang Liu, Han-Hsiang Chen, Hung-I Yeh
BACKGROUND/AIMS: Indoxyl sulfate (IS) is a protein-bound uremic toxin that accumulates in patients with chronic kidney disease (CKD). We explored the effect of IS on human early endothelial progenitor cells (EPCs) and analyzed the correlation between serum IS levels and parameters of vascular function, including endothelial function in a CKD-based cohort. METHODS: A cross-sectional study with 128 stable CKD patients was conducted. Flow-mediated dilation (FMD), pulse wave velocity (PWV), ankle brachial index, serum IS and other biochemical parameters were measured and analyzed...
2016: Kidney & Blood Pressure Research
https://www.readbyqxmd.com/read/28001180/is-there-a-relationship-between-tryptophan-dietary-intake-and-plasma-levels-of-indoxyl-sulfate-in-chronic-kidney-disease-patients-on-hemodialysis
#13
Jessyca Sousa de Brito, Natália Alvarenga Borges, Carla Juliana Ribeiro Dolenga, José Carlos Carraro-Eduardo, Lia Sumie Nakao, Denise Mafra
INTRODUCTION: Gut microbiota is involved in generation of uremic toxins in chronic kidney disease (CKD) patients on hemodialysis (HD), like indoxyl sulfate (IS) that is originated from tryptophan amino acid fermentation. OBJECTIVE: To evaluate the tryptophan intake by chronic renal failure patients on HD and its possible relationship with IS plasma levels. METHODS: Participated of the study 46 patients with CKD on HD regular program (56.5% men; 52...
December 2016: Jornal Brasileiro de Nefrologia: ʹorgão Oficial de Sociedades Brasileira e Latino-Americana de Nefrologia
https://www.readbyqxmd.com/read/28001026/keto-analogues-and-essential-amino-acids-and-other-supplements-in-the-conservative-management-of-chronic-kidney-disease
#14
Adamasco Cupisti, Piergiorgio Bolasco
The manipulation of dietary protein intake is the mainstay of nutritional treatment of patients affected by chronic renal insufficiency, with an aim to reduce the burden of uremic toxins in order to decrease uremic toxicity and delay the need for dialysis. Consensus exists regarding the benefit of progressive protein restriction towards delaying the progression of renal failure and the need for dialysis, provided adequate energy supply. Although pivotal, protein restriction is only one aspect of the dietary management of CKD patients...
December 21, 2016: Panminerva Medica
https://www.readbyqxmd.com/read/28001024/microbiota-and-prebiotics-modulate-uremic-toxins-generation
#15
Laetitia Koppe, Denis Fouque
Recent data have shown that the host-intestinal microbiota interaction is intrinsically linked with overall health. Chronic kidney disease (CKD) could influence intestinal microbiota and gut dysbiosis is also considered as a cause of progression of kidney disease. An increasing body of evidence indicates that dysbiosis is a key contributor of uremic retention solutes (URS) accumulating in patients with CKD. The discovery of the kidney- gut axis has created new therapeutic opportunities for nutritional intervention in order to prevent adverse outcomes...
December 21, 2016: Panminerva Medica
https://www.readbyqxmd.com/read/27999257/modified-lipids-and-lipoproteins-in-chronic-kidney-disease-a-new-class-of-uremic-toxins
#16
REVIEW
Nans Florens, Catherine Calzada, Egor Lyasko, Laurent Juillard, Christophe O Soulage
Chronic kidney disease (CKD) is associated with an enhanced oxidative stress and deep modifications in lipid and lipoprotein metabolism. First, many oxidized lipids accumulate in CKD and were shown to exert toxic effects on cells and tissues. These lipids are known to interfere with many cell functions and to be pro-apoptotic and pro-inflammatory, especially in the cardiovascular system. Some, like F2-isoprostanes, are directly correlated with CKD progression. Their accumulation, added to their noxious effects, rendered their nomination as uremic toxins credible...
December 16, 2016: Toxins
https://www.readbyqxmd.com/read/27995744/online-hemodiafiltration-reduces-bisphenol-a-levels
#17
Borja Quiroga, Ricardo J Bosch, Ruth A Fiallos, Marta Sánchez-Heras, Nuria Olea-Herrero, Pilar López-Aparicio, Carmen Muñóz-Moreno, Miguel Angel Pérez-Alvarsan, Gabriel De Arriba
Several uremic toxins have been identified and related to higher rates of morbidity and mortality in dialysis patients. Bisphenol A (BPA) accumulates in patients with chronic kidney disease. The aim of this study is to demonstrate the usefulness of online hemodiafiltration (OL-HDF) in reducing BPA levels. Thirty stable hemodialysis patients were selected to participate in this paired study. During three periods of 3 weeks each, patients were switched from high-flux hemodialysis (HF-HD) to OL-HDF, and back to HF-HD...
December 20, 2016: Therapeutic Apheresis and Dialysis
https://www.readbyqxmd.com/read/27991739/paediatric-hus-cases-related-to-the-consumption-of-raw-milk-sold-by-vending-machines-in-italy-quantitative-risk-assessment-based-on-escherichia-coli-o157-official-controls-over-7%C3%A2-years
#18
F Giacometti, P Bonilauri, S Piva, G Scavia, S Amatiste, D M Bianchi, M N Losio, S Bilei, G Cascone, D Comin, P Daminelli, L Decastelli, G Merialdi, R Mioni, A Peli, A Petruzzelli, F Tonucci, G Liuzzo, A Serraino
A quantitative risk assessment (RA) was developed to estimate haemolytic-uremic syndrome (HUS) cases in paediatric population associated with the consumption of raw milk sold in vending machines in Italy. The historical national evolution of raw milk consumption phenomenon since 2008, when consumer interest started to grow, and after 7 years of marketing adjustment, is outlined. Exposure assessment was based on the official Shiga toxin-producing Escherichia coli O157:H7 (STEC) microbiological records of raw milk samples from vending machines monitored by the regional Veterinary Authorities from 2008 to 2014, microbial growth during storage, consumption frequency of raw milk, serving size, consumption preference and age of consumers...
December 19, 2016: Zoonoses and Public Health
https://www.readbyqxmd.com/read/27990791/the-role-of-carbon-adsorbent-in-the-conservative-management-of-chronic-kidney-disease
#19
Toshimitsu Niwa
Indoxyl sulfate is a uremic toxin, and cannot be removed efficiently by hemodialysis due to its protein-binding. Indoxyl sulfate induces cellular dysfunction by producing reactive oxygen species (ROS) such as superoxide by activating nicotinamide adenine dinucleotide phosphate oxidase, and by activating aryl hydrocarbon receptor through its uptake via organic anion transporters (OAT1 and OAT3). Indoxyl sulfate shows toxic effects on a variety of cells such as renal proximal tubular cells, glomerular mesangial cells, vascular smooth muscle cells, vascular endothelial cells, cardiomyocytes, cardiac fibroblasts, monocytes, osteoblasts, osteoclasts, and myocytes...
December 16, 2016: Panminerva Medica
https://www.readbyqxmd.com/read/27978427/microbial-modulation-of-a-uremic-toxin
#20
Sarah M Skye, Stanley L Hazen
In this issue of Cell Host & Microbe, Devlin et al. (2016) identify a family of tryptophanases encoded by members of the human gut microbiome and demonstrate that levels of the uremic toxin indoxyl sulfate can be modulated in vivo by altering the abundance of bacteria harboring tryptophanase activity.
December 14, 2016: Cell Host & Microbe
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