Blog
About

0
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found

      The Ferroxidase Activity of Caeruloplasmin Is Reduced in Haemodialysis Patients

      Read this article at

      ScienceOpenPublisherPubMed
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Increased free-radical production leading to oxidative stress may contribute to the development of cardiovascular complications in haemodialysis patients. The ferroxidase activity of caeruloplasmin forms an important component of antioxidant defences in body fluids. The aim of this study was to assess ferroxidase activity in haemodialysis patients. Venous blood was collected from 83 haemodialysis patients immediately prior to and after dialysis and from 52 healthy controls. Immunoreactive caeruloplasmin was measured by rate nephelometry, and ferroxidase activity determined by measuring loading of ferrous iron onto iron-free transferrin. A significant reduction in ferroxidase activity was observed in dialysis patients when compared with controls (37 ± 1.20 and 46 ± 1.14 mU/l, respectively; p < 0.001). Following dialysis, ferroxidase activity rose significantly to 41 ± 1.16 mU/l, with a significant difference still remaining between control and patient ferroxidase activity (p < 0.005). Immunoreactive caeruloplasmin was found to be similar in all groups (before dialysis 0.40 ± 0.07 g/l, after dialysis 0.39 ± 0.07 g/l, control 0.42 ± 0.09 g/l: p = NS). A significant difference in caeruloplasmin-specific activity was therefore observed between predialysis, postdialysis and control samples (97 ± 2.31, 105 ± 1.74 and 112 ± 1.51 mU/g; p < 0.001, p < 0.01, respectively). Ferroxidase activity of caeruloplasmin is impaired in renal failure. Inhibition of caeruloplasmin ferroxidase activity in dialysis patients may contribute to increased oxidative stress in these patients.

          Related collections

          Most cited references 5

          • Record: found
          • Abstract: not found
          • Article: not found

          Lipoperoxidation in plasma and red blood cells of patients undergoing haemodialysis: Vitamins A, E, and iron status

            Bookmark
            • Record: found
            • Abstract: found
            • Article: found

            Trace Elements in Hemodialysis and Continuous Ambulatory Peritoneal Dialysis Patients

            Alterations in blood and tissue concentrations of trace elements in patients with chronic renal failure have been extensively investigated. Selenium, zinc and copper are elements which play an important role in biological systems as components of proteins, enzymes and antioxidants. The concentrations of selenium, zinc and copper were determined in the plasma, erythrocytes and whole blood of patients on regular hemodialysis (HD) and continuous ambulatory peritoneal dialysis (CAPD) treatment using the method of inductively coupled plasma mass spectrometry (ICP-MS). Analysis of isotopes 77 Se, 66 Zn and 65 Cu was performed. Methodology presents the major limitation to valid studies on trace element levels in biological materials. One of the widely used contemporary techniques is ICP-MS. It is the most sensitive one and has a high dynamic range. The selenium concentration in the studied compartments (plasma 46.1 ± 3.0 vs. 78.0 ± 3.4 μg/l, p < 0.001; erythrocytes 90.4 ± 6.5 vs. 134.2 ± 7.6 μg/l, p < 0.01; whole blood 67.3 ± 3.1 vs. 106.4 ± 3.4 μg/l, p < 0.001) was significantly lower in HD patients compared to healthy controls. The same result was observed in plasma (63.2 ± 5.8 vs. 78.0 ± 3.4 μg/l, p < 0.05) and whole blood (82.7 ± 7.4 vs. 106.4 ± 3.4 μg/l, p < 0.01) from CAPD patients, but the selenium level of erythrocytes in CAPD patients was the same as in the control group (126.0 ± 8.8 vs. 134.2 ± 7.6 μg/l). The cooper content of erythrocytes was lower in HD patients than in controls (0.55 ± 0.02 vs. 0.66 ± 0.01 mg/l, p < 0.01) and CAPD groups (0.55 ± 0.02 vs. 0.68 ± 0.02 mg/l, p < 0.001). There were no differences in copper content in plasma (HD 1.02 ± 0.06; CAPD 1.11 ± 0.09; controls 1.02 ± 0.05  mg/l) and whole blood (HD 0.87 ± 0.04; CAPD 0.90 ± 0.05; controls 0.85 ± 0.02 mg/l) in HD and CAPD patients and healthy controls. The zinc concentration was increased in the whole blood of CAPD patients (6.68 ± 0.36 vs. 5.52 ± 0.11 mg/l, p < 0.001) and erythrocytes of HD (12.30 ± 0.23 vs. 10.11 ± 0.42 mg/l, p < 0.001), and CAPD groups (13.71 ± 0.56 vs. 10.11 ± 0.42 mg/l, p < 0.001) compared to controls. However, the plasma zinc concentration was lower in HD patients compared to blood donors (0.69 ± 0.03 vs. 0.92 ± 0.03 mg/l, p < 0.001) and CAPD patients (0.69 ± 0.03 vs. 0.95 ± 0.04 mg/l, p < 0.001). We did not find a significant increase in trace elements in whole blood after HD. These results suggest differences between plasma, erythrocytes and whole blood concentrations of the studied trace elements. The levels of trace elements are altered by HD and CAPD. A modern precise method with high accuracy, ICP-MS, which was used in our study, eliminated analytical errors and possible interferences.
              Bookmark
              • Record: found
              • Abstract: found
              • Article: found

              Plasma Glutathione Peroxidase Activity Is Reduced in Haemodialysis Patients

              Cardiovascular disease is the major cause of morbidity and mortality in patients with end-stage renal failure. Increased free radical production and antioxidant depletion may contribute to the greatly increased risk of atherosclerosis in these patients. Glutathione peroxidase (GPX) is an important antioxidant, the plasma form of which is synthesized mainly in the kidney (eGPX). The aim of this study was to assess the activity of eGPX in patients with end-stage renal failure on haemodialysis. Venous blood was collected from 87 haemodialysis patients immediately prior to and after dialysis and from 70 healthy controls. Serum eGPX activity was measured using hydrogen peroxide as substrate and immunoreactivity determined by ELISA. eGPX activity was significantly reduced in dialysis patients when compared to controls (106 ± 2.7 and 281 ± 3.6 U/l respectively, p < 0.001). Following haemodialysis, eGPX activity rose significantly to 146 ± 3.8 U/l, p < 0.001, although remaining below control values (p < 0.005). Immunoreactive eGPX, however, was similar in all groups (pre-dialysis 14.10 ± 1.26 µg/ml, post-dialysis 14.58 ± 1.35 µg/ml, controls 15.20 ± 1.62 µg/ml, p = NS). A decrease was observed in the specific activity of eGPX in patients when compared to controls (8.81 ± 1.14, 10.71 ± 1.54 and 21.97 ± 1.68 U/mg respectively, p < 0.0001). eGPX activity is impaired in patients undergoing haemodialysis and so may contribute to atherogenesis in renal failure.
                Bookmark

                Author and article information

                Journal
                NEF
                Nephron
                10.1159/issn.1660-8151
                Nephron
                S. Karger AG
                1660-8151
                2235-3186
                2000
                March 2000
                08 March 2000
                : 84
                : 3
                : 211-217
                Affiliations
                Departments of aClinical Biochemistry and bMedicine, Queen’s University of Belfast, and cThe Regional Nephrology Unit, Belfast City Hospital, Belfast, Northern Ireland
                Article
                45579 Nephron 2000;84:211–217
                10.1159/000045579
                10720890
                © 2000 S. Karger AG, Basel

                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.

                Page count
                Figures: 4, Tables: 2, References: 21, Pages: 7
                Product
                Self URI (application/pdf): https://www.karger.com/Article/Pdf/45579
                Categories
                Original Paper

                Comments

                Comment on this article