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      Call for Papers: Green Renal Replacement Therapy: Caring for the Environment

      Submit here before July 31, 2024

      About Blood Purification: 3.0 Impact Factor I 5.6 CiteScore I 0.83 Scimago Journal & Country Rank (SJR)

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      Biological Effects of Electrolyzed Water in Hemodialysis

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          Abstract

          Background/Aims: The application of electrolyzed water (EW) at the cathode side to manufacture reverse osmosis (RO) water and hemodialysis (HD) solution can actually lead to less oxidative capacity in chemical terms. The present study examined the biological actions of this water on human polymorphonuclear leukocytes (PMNs), and the clinical feasibility of applying this technology to HD treatment. Methods: RO water using EW (e-RO) exhibited less chemiluminescence in luminol-hydrogen peroxide and higher dissolved hydrogen levels (–99.0 ppb) compared with control RO water. The effects of e-RO on PMN viability were tested. HD using e-RO was performed for 12 consecutive sessions in 8 patients for the feasibility test. Results: Basal cellular viability and function to generate superoxide radicals of PMNs were better preserved by e-RO application. In the clinical trial, reductions of blood pressure were noted, but no adverse events were observed. There were no changes in the blood dialysis parameters, although methylguanidine levels were significantly decreased at the end of study. Conclusion: The present study demonstrated the capacity of e-RO to preserve the viability of PMNs, and the clinical feasibility of applying this water for HD treatment. The clinical application of this technology may improve the bio-compatibility of HD treatment.

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          The elephant in uremia: oxidant stress as a unifying concept of cardiovascular disease in uremia.

          Jonathan Himmelfarb, Peter Stenvinkel, T Alp Ikizler … (2002)
          Cardiovascular disease is the leading cause of mortality in uremic patients. In large cross-sectional studies of dialysis patients, traditional cardiovascular risk factors such as hypertension and hypercholesterolemia have been found to have low predictive power, while markers of inflammation and malnutrition are highly correlated with cardiovascular mortality. However, the pathophysiology of the disease process that links uremia, inflammation, and malnutrition with increased cardiovascular complications is not well understood. We hereby propose the hypothesis that increased oxidative stress and its sequalae is a major contributor to increased atherosclerosis and cardiovascular morbidity and mortality found in uremia. This hypothesis is based on studies that conclusively demonstrate an increased oxidative burden in uremic patients, before and particularly after renal replacement therapies, as evidenced by higher concentrations of multiple biomarkers of oxidative stress. This hypothesis also provides a framework to explain the link that activated phagocytes provide between oxidative stress and inflammation (from infectious and non-infections causes) and the synergistic role that malnutrition (as reflected by low concentrations of albumin and/or antioxidants) contributes to the increased burden of cardiovascular disease in uremia. We further propose that retained uremic solutes such as beta-2 microglobulin, advanced glycosylated end products (AGE), cysteine, and homocysteine, which are substrates for oxidative injury, further contribute to the pro-atherogenic milieu of uremia. Dialytic therapy, which acts to reduce the concentration of oxidized substrates, improves the redox balance. However, processes related to dialytic therapy, such as the prolonged use of catheters for vascular access and the use of bioincompatible dialysis membranes, can contribute to a pro-inflammatory and pro-oxidative state and thus to a pro-atherogenic state. Anti-oxidative therapeutic strategies for patients with uremia are in their very early stages; nonetheless, early studies demonstrate the potential for significant efficacy in reducing cardiovascular complications.
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            Formation of glyoxal, methylglyoxal and 3-deoxyglucosone in the glycation of proteins by glucose.

            P Thornalley, A Langborg, H S Minhas (1999)
            The glycation of proteins by glucose has been linked to the development of diabetic complications and other diseases. Early glycation is thought to involve the reaction of glucose with N-terminal and lysyl side chain amino groups to form Schiff's base and fructosamine adducts. The formation of the alpha-oxoaldehydes, glyoxal, methylglyoxal and 3-deoxyglucosone, in early glycation was investigated. Glucose (50 mM) degraded slowly at pH 7.4 and 37 degrees C to form glyoxal, methylglyoxal and 3-deoxyglucosone throughout a 3-week incubation period. Addition of t-BOC-lysine and human serum albumin increased the rate of formation of alpha-oxoaldehydes - except glyoxal and methylglyoxal concentrations were low with albumin, as expected from the high reactivity of glyoxal and methylglyoxal with arginine residues. The degradation of fructosyl-lysine also formed glyoxal, methylglyoxal and 3-deoxyglucosone. alpha-Oxoaldehyde formation was dependent on the concentration of phosphate buffer and availability of trace metal ions. This suggests that alpha-oxoaldehydes were formed in early glycation from the degradation of glucose and Schiff's base adduct. Since alpha-oxoaldehydes are important precursors of advanced glycation adducts, these adducts may be formed from early and advanced glycation processes. Short periods of hyperglycaemia, as occur in impaired glucose tolerance, may be sufficient to increase the concentrations of alpha-oxoaldehydes in vivo.
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              High glucose increases angiopoietin-2 transcription in microvascular endothelial cells through methylglyoxal modification of mSin3A.

              Dachun Yao, Richard Pestell, Hans-Peter Hammes … (2007)
              Methylglyoxal is a highly reactive dicarbonyl degradation product formed from triose phosphates during glycolysis. Methylglyoxal forms stable adducts primarily with arginine residues of intracellular proteins. The biologic role of this covalent modification in regulating cell function is not known. Here we report that in mouse kidney endothelial cells, high glucose causes increased methylglyoxal modification of the corepressor mSin3A. Methylglyoxal modification of mSin3A results in increased recruitment of O-GlcNAc-transferase, with consequent increased modification of Sp3 by O-linked N-acetylglucosamine. This modification of Sp3 causes decreased binding to a glucose-responsive GC-box in the angiopoietin-2 (Ang-2) promoter, resulting in increased Ang-2 expression. Increased Ang-2 expression induced by high glucose increased expression of intracellular adhesion molecule 1 and vascular cell adhesion molecule 1 in cells and in kidneys from diabetic mice and sensitized microvascular endothelial cells to the proinflammatory effects of tumor necrosis factor alpha. This novel mechanism for regulating gene expression may play a role in the pathobiology of diabetic vascular disease.
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                Author and article information

                Journal
                Journal ID (publisher-id): NEC
                Journal ID (nlm-ta): Nephron Clin Pract
                Journal ID (doi): 10.1159/issn.1660-2110
                Title: Nephron Clinical Practice
                Publisher: S. Karger AG
                ISSN (Electronic): 1660-2110
                Publication date Subscription-year: 2009
                Publication date (Print): May 2009
                Publication date (Electronic): 03 April 2009
                Volume: 112
                Issue: 1
                Pages: c9-c15
                Affiliations
                aResearch Division of Dialysis and Chronic Kidney Disease, Tohoku University Graduate School of Medicine, bDepartment of Blood Purification, Tohoku University Hospital, Sendai, cNihon Trim Co. Ltd., Osaka, dDialysis Center, Kashima Hospital, Iwaki, Japan
                Article
                Publisher ID: 210569 Other ID: Nephron Clin Pract 2009;112:c9–c15
                DOI: 10.1159/000210569
                PubMed ID: 19342864
                SO-VID: 73e05738-0a1a-4dc1-9959-325a48c294ac
                Copyright © © 2009 S. Karger AG, Basel
                License:

                Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

                History
                Date received : 20 November 2007
                Date accepted : 28 September 2008
                Page count
                Figures: 5, Tables: 3, References: 26, Pages: 1
                Categories
                Subject: Original Paper

                ScienceOpen disciplines: Cardiovascular Medicine,Nephrology
                Keywords: Methylglyoxal,Oxidative stress,Electrolyzed water,Neutrophils,Hemodialysis
                Data availability:
                ScienceOpen disciplines: Cardiovascular Medicine, Nephrology
                Keywords: Methylglyoxal, Oxidative stress, Electrolyzed water, Neutrophils, Hemodialysis

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