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      Evidence for a Proximal and Distal Nephron Action of Atrial Natriuretic Factor in Man

      research-article
      , ,
      Nephron
      S. Karger AG
      Atrial natriuretic factor, Lithium clearance, Proximal renal tubule, Distal nephron

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          Abstract

          The intrarenal mechanism of action of atrial natriuretic (ANF) remains uncertain. Animal work suggests that part of the natriuretic effect of ANF may be due to inhibition of proximal and distal nephron sodium reabsorption and we now present evidence for similar effects of ANF in man. Six sodium replete normal male volunteers were studied during maximal water diuresis. Lithium clearance was used to assess segmental nephron function. ANF infusion caused a significant increase in fractional lithium clearance (FE<sub>Li</sub>) compared to placebo infusion. A similar change in fractional distal delivery, a conventional marker of proximal tubular outflow, also occurred during ANF infusion independently corroborating the increase in FE<sub>Li</sub>. These findings suggest that ANF inhibits whole-kidney fractional proximal tubular sodium reabsorption in man. Evidence is also presented to show that ANF depresses distal nephron fractional sodium reabsorption as evaluated both by the lithium method and by estimation of solute-free water clearance.

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          Author and article information

          Journal
          NEF
          Nephron
          10.1159/issn.1660-8151
          Nephron
          S. Karger AG
          1660-8151
          2235-3186
          1989
          1989
          09 December 2008
          : 51
          : 1
          : 39-43
          Affiliations
          Department of Clinical Pharmacology, Ninewells Hospital and Medical School, Dundee, UK
          Article
          185240 Nephron 1989;51:39–43
          10.1159/000185240
          2521696
          994529d4-71e0-4cf4-a168-04eb98b3ac36
          © 1989 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.

          History
          : 25 March 1988
          Page count
          Pages: 5
          Categories
          Original Paper

          Cardiovascular Medicine,Nephrology
          Lithium clearance,Atrial natriuretic factor,Distal nephron,Proximal renal tubule

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