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      Regulation of Acid-Base Transporters by Vasopressin in the Kidney Collecting Duct of Brattleboro Rat

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          Abstract

          Aim: The objective of these studies was to examine the effects of long-term vasopressin treatment on acid-base transporters in the collecting duct of rat kidney. Methods: Brattleboro rats were placed in metabolic cages and treated with daily injections of 1-desamino-8- D-arginine vasopressin (dDAVP), a selective V<sub>2</sub>-receptor agonist, or its vehicle (control) for up to 8 days. Results: dDAVP treatment resulted in a significant reduction in serum bicarbonate concentration, and caused the upregulation of key ammoniagenesis enzymes, along with increased urinary NH<sub>4</sub><sup>+</sup> excretion. Northern hybridization and immunofluorescence labeling indicated a significant increase (+80%) in mRNA expression of the apical Cl<sup>–</sup>/HCO<sub>3</sub><sup>–</sup> exchanger pendrin (PDS), along with a sharp increase in its protein abundance in B-type intercalated cells in the cortical collecting duct in dDAVP-treated rats. In the inner medullary collecting duct, the abundance of basolateral Cl<sup>–</sup>/HCO<sub>3</sub><sup>–</sup> exchanger (AE1) and apical H<sup>+</sup>-ATPase was significantly reduced in dDAVP-treated rats. Kidney renin mRNA increased significantly and correlated with an increase in serum aldosterone levels in dDAVP-injected rats. Serum corticosterone levels were, however, reduced and correlated with increased mRNA levels of renal 11β-hydroxysteroid dehydrogenase-2 (11β-HSD2) and decreased mRNA expression of 11β-hydroxylase in the adrenal gland of dDAVP-injected rats. Conclusion: Chronic administration of dDAVP to Brattleboro rats is associated with the upregulation of PDS and downregulation of H<sup>+</sup>-ATPase and AE1 in the collecting duct, along with increased ammoniagenesis. Stimulation of the renin-angiotensin-aldosterone system and/or decreased glucocorticoid levels likely plays a role in the transduction of these effects.

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          Most cited references 17

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          Single-step method of RNA isolation by acid guanidinium thiocyanate-phenol-chloroform extraction.

          A new method of total RNA isolation by a single extraction with an acid guanidinium thiocyanate-phenol-chloroform mixture is described. The method provides a pure preparation of undegraded RNA in high yield and can be completed within 4 h. It is particularly useful for processing large numbers of samples and for isolation of RNA from minute quantities of cells or tissue samples.
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            The syndrome of inappropriate secretion of antidiuretic hormone.

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              Deoxycorticosterone upregulates PDS (Slc26a4) in mouse kidney: role of pendrin in mineralocorticoid-induced hypertension.

              Pendrin is an anion exchanger expressed along the apical plasma membrane and apical cytoplasmic vesicles of type B and of non-A, non-B intercalated cells of the distal convoluted tubule, connecting tubule, and cortical collecting duct. Thus, Pds (Slc26a4) is a candidate gene for the putative apical anion-exchange process of the type B intercalated cell. Because apical anion exchange-mediated transport is upregulated with deoxycorticosterone pivalate (DOCP), we tested whether Pds mRNA and protein expression in mouse kidney were upregulated after administration of this aldosterone analogue by using quantitative real-time polymerase chain reaction as well as light and electron microscopic immunolocalization. In kidneys from DOCP-treated mice, Pds mRNA increased 60%, whereas pendrin protein expression in the apical plasma membrane increased 2-fold in non-A, non-B intercalated cells and increased 6-fold in type B cells. Because pendrin transports HCO3- and Cl-, we tested whether DOCP treatment unmasks abnormalities in acid-base or NaCl balance in Pds (-/-) mice. In the absence of DOCP, arterial pH, systolic blood pressure, and body weight were similar in Pds (+/+) and Pds (-/-) mice. After DOCP treatment, weight gain and hypertension were observed in Pds (+/+) but not in Pds (-/-) mice. Moreover, after DOCP administration, metabolic alkalosis was more severe in Pds (-/-) than Pds (+/+) mice. We conclude that pendrin is upregulated with aldosterone analogues and is critical in the pathogenesis of mineralocorticoid-induced hypertension and metabolic alkalosis.
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                Author and article information

                Journal
                AJN
                Am J Nephrol
                10.1159/issn.0250-8095
                American Journal of Nephrology
                S. Karger AG
                0250-8095
                1421-9670
                2006
                May 2006
                02 June 2006
                : 26
                : 2
                : 194-205
                Affiliations
                Departments of aMedicine and bSurgery, University of Cincinnati, and cVeterans Affairs Medical Center, Cincinnati, Ohio, USA
                Article
                93305 Am J Nephrol 2006;26:194–205
                10.1159/000093305
                16699257
                © 2006 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
                Tables: 1, References: 41, Pages: 12
                Product
                Self URI (application/pdf): https://www.karger.com/Article/Pdf/93305
                Categories
                Original Report: Laboratory Investigation

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