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      Consequences of Intrauterine Growth Restriction for the Kidney

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          Abstract

          Low birth weight due to intrauterine growth restriction is associated with various diseases in adulthood, such as hypertension, cardiovascular disease, insulin resistance and end-stage renal disease. The purpose of this review is to describe the effects of intrauterine growth restriction on the kidney. Nephrogenesis requires a fine balance of many factors that can be disturbed by intrauterine growth restriction, leading to a low nephron endowment. The compensatory hyperfiltration in the remaining nephrons results in glomerular and systemic hypertension. Hyperfiltration is attributed to several factors, including the renin-angiotensin system (RAS), insulin-like growth factor (IGF-I) and nitric oxide. Data from human and animal studies are presented, and suggest a faltering IGF-I and an inhibited RAS in intrauterine growth restriction. Hyperfiltration makes the kidney more vulnerable during additional kidney disease, and is associated with glomerular damage and kidney failure in the long run. Animal studies have provided a possible therapy with blockage of the RAS at an early stage in order to prevent the compensatory glomerular hyperfiltration, but this is far from being applicable to humans. Research is needed to further unravel the effect of intrauterine growth restriction on the kidney.

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          A role for uric acid in the progression of renal disease.

          Duk-Hee Kang, Takahiko Nakagawa, Lili Feng … (2002)
          Hyperuricemia is associated with renal disease, but it is usually considered a marker of renal dysfunction rather than a risk factor for progression. Recent studies have reported that mild hyperuricemia in normal rats induced by the uricase inhibitor, oxonic acid (OA), results in hypertension, intrarenal vascular disease, and renal injury. This led to the hypothesis that uric acid may contribute to progressive renal disease. To examine the effect of hyperuricemia on renal disease progression, rats were fed 2% OA for 6 wk after 5/6 remnant kidney (RK) surgery with or without the xanthine oxidase inhibitor, allopurinol, or the uricosuric agent, benziodarone. Renal function and histologic studies were performed at 6 wk. Given observations that uric acid induces vascular disease, the effect of uric acid on vascular smooth muscle cells in culture was also examined. RK rats developed transient hyperuricemia (2.7 mg/dl at week 2), but then levels returned to baseline by week 6 (1.4 mg/dl). In contrast, RK+OA rats developed higher and more persistent hyperuricemia (6 wk, 3.2 mg/dl). Hyperuricemic rats demonstrated higher BP, greater proteinuria, and higher serum creatinine than RK rats. Hyperuricemic RK rats had more renal hypertrophy and greater glomerulosclerosis (24.2 +/- 2.5 versus 17.5 +/- 3.4%; P < 0.05) and interstitial fibrosis (1.89 +/- 0.45 versus 1.52 +/- 0.47; P < 0.05). Hyperuricemic rats developed vascular disease consisting of thickening of the preglomerular arteries with smooth muscle cell proliferation; these changes were significantly more severe than a historical RK group with similar BP. Allopurinol significantly reduced uric acid levels and blocked the renal functional and histologic changes. Benziodarone reduced uric acid levels less effectively and only partially improved BP and renal function, with minimal effect on the vascular changes. To better understand the mechanism for the vascular disease, the expression of COX-2 and renin were examined. Hyperuricemic rats showed increased renal renin and COX-2 expression, the latter especially in preglomerular arterial vessels. In in vitro studies, cultured vascular smooth muscle cells incubated with uric acid also generated COX-2 with time-dependent proliferation, which was prevented by either a COX-2 or TXA-2 receptor inhibitor. Hyperuricemia accelerates renal progression in the RK model via a mechanism linked to high systemic BP and COX-2-mediated, thromboxane-induced vascular disease. These studies provide direct evidence that uric acid may be a true mediator of renal disease and progression.
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            Nephron number in patients with primary hypertension.

            Gunhild Keller, Gisela Zimmer, Gerhard Mall … (2003)
            A diminished number of nephrons has been proposed as one of the factors contributing to the development of primary hypertension. To test this hypothesis, we used a three-dimensional stereologic method to compare the number and volume of glomeruli in 10 middle-aged white patients (age range, 35 to 59 years) with a history of primary hypertension or left ventricular hypertrophy (or both) and renal arteriolar lesions with the number and volume in 10 normotensive subjects matched for sex, age, height, and weight. All 20 subjects had died in accidents. Patients with hypertension had significantly fewer glomeruli per kidney than matched normotensive controls (median, 702,379 vs. 1,429,200). Patients with hypertension also had a significantly greater glomerular volume than did the controls (median, 6.50x10(-3) mm3 vs. 2.79x10(-3) mm3; P<0.001) but very few obsolescent glomeruli. The data support the hypothesis that the number of nephrons is reduced in white patients with primary hypertension. Copyright 2003 Massachusetts Medical Society
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              The hyperfiltration theory: a paradigm shift in nephrology.

              Barry Brenner, Elizabeth Lawler, Harald Mackenzie (1996)
              Experimental studies incriminate glomerular hypertension in mediating progressive renal damage after any of a variety of initiating injuries. Prevention of glomerular hypertension by dietary protein restriction or antihypertensive therapy lessens progressive glomerular damage in several experimental models of chronic renal disease. Glomerular hypertension and hyperfiltration also occur in humans with diabetes mellitus, solitary or remnant kidneys, and various forms of acquired renal disease. Clinical studies indicate that dietary protein restriction and antihypertensive therapy also slow progression in many of these disorders. Large multicenter trials confirm the beneficial effects of these therapeutic maneuvers on the rate of progression of chronic renal disease.
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                Author and article information

                Journal
                Journal ID (publisher-id): KBR
                Journal ID (nlm-ta): Kidney Blood Press Res
                Journal ID (doi): 10.1159/issn.1420-4096
                Title: Kidney and Blood Pressure Research
                Publisher: S. Karger AG
                ISSN (Print): 1420-4096
                ISSN (Electronic): 1423-0143
                Publication date Subscription-year: 2006
                Publication date (Print): August 2006
                Publication date (Electronic): 15 August 2006
                Volume: 29
                Issue: 2
                Pages: 108-125
                Affiliations
                Departments of aPediatric Nephrology and bPediatric Endocrinology, VU University Medical Center, Amsterdam, The Netherlands
                Article
                Publisher ID: 94538 Other ID: Kidney Blood Press Res 2006;29:108–125
                DOI: 10.1159/000094538
                PubMed ID: 16837795
                SO-VID: 758189cd-8251-48b4-9b96-6cb8a4017ee2
                Copyright © © 2006 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 : 24 January 2006
                Date accepted : 16 June 2006
                Page count
                Figures: 1, Tables: 3, References: 360, Pages: 18
                Categories
                Subject: Review

                ScienceOpen disciplines: Cardiovascular Medicine,Nephrology
                Keywords: Insulin-like growth factor I,Intrauterine growth restriction,Low birth weight,Nephrogenesis,Glomerular number,Kidney function,Glomerular hyperfiltration,Glomerulosclerosis,Renin-angiotensin system,Nitric oxide
                Data availability:
                ScienceOpen disciplines: Cardiovascular Medicine, Nephrology
                Keywords: Insulin-like growth factor I, Intrauterine growth restriction, Low birth weight, Nephrogenesis, Glomerular number, Kidney function, Glomerular hyperfiltration, Glomerulosclerosis, Renin-angiotensin system, Nitric oxide

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