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Vol. 182, No. 2, 2006
Issue release date: June 2006
Section title: Original Paper
Cells Tissues Organs 2006;182:106–114
(DOI:10.1159/000093065)

Renal Angiotensin Receptor Type 1 and 2 Upregulation in Intrauterine Growth Restriction of Newborn Piglets

Rüster M. · Sommer M. · Stein G. · Bauer K. · Walter B. · Wolf G. · Bauer R.
aDepartment of Internal Medicine III and bInstitute of Molecular Cell Biology, Pathophysiology Lab, Universitätsklinikum Jena, Friedrich Schiller University, Jena, Germany

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: 2/23/2006
Published online: 6/26/2006

Number of Print Pages: 9
Number of Figures: 3
Number of Tables: 2

ISSN: 1422-6405 (Print)
eISSN: 1422-6421 (Online)

For additional information: http://www.karger.com/CTO

Abstract

Epidemiological and experimental studies suggest that intrauterine growth restriction (IUGR) is associated with abnormalities in kidney development which is thought to be linked with alterations causing adult cardiovascular diseases. The renin-angiotensin system (RAS) plays an important role in the development of renal vascular and tubular structures, and is known to be altered by experimentally induced IUGR. These experimental models of IGUR have been criticized because they may have a more severe impact on intrauterine development than that which is normally encountered in humans. Therefore, we asked whether naturally occurring small-for-gestational-age newborn piglets exhibit features of altered RAS activity. We investigated the regional renal expression of angiotensin II type 1 (AT1) and AT2 receptors in normal-weight and IUGR piglets. The AT1 receptor mRNA expression was markedly enhanced in IUGR piglets, in the renal cortex by 64% and in the renal medulla by 52% (p < 0.05, compared with normal littermates). In contrast, mRNA expression for the AT2 receptor was similar in both the normal-weight and IUGR piglets. A significantly higher AT1 receptor protein expression was found in the IUGR piglets (p < 0.05) in the glomeruli, in the proximal and distal tubules, as well as in the collecting ducts by immunohistochemistry. Furthermore, AT2 receptor protein expression was significantly higher in the IUGR piglets (p < 0.05) in the subcapsular nephrogenic zone and in the distal tubules and collecting ducts. Thus, IUGR is accompanied by an upregulation of angiotensin II receptor expression in the kidneys of newborn piglets. This may indicate an alteration of the RAS in newborns suffering from naturally occurring IUGR.


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Received: 2/23/2006
Published online: 6/26/2006

Number of Print Pages: 9
Number of Figures: 3
Number of Tables: 2

ISSN: 1422-6405 (Print)
eISSN: 1422-6421 (Online)

For additional information: http://www.karger.com/CTO


Copyright / Drug Dosage

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 or, in the case of photocopying, direct payment of a specified fee to the Copyright Clearance Center.
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 goverment 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.
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