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      Call for Papers: Green Renal Replacement Therapy: Caring for the Environment

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      Imaging the Embryonic Kidney

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          Abstract

          The structural and functional development of the permanent mammalian kidney or metanephros is a complex process involving the actions of thousands of gene products, complex cell movements and tissue patterning in three dimensions (3D). This review focuses on the recent advances made in imaging technology, processing and analysis combined with mouse genetics and the generation of protein-reporter mice which has enabled us to monitor the development and movement of defined cell populations within the developing kidney in 3D and over time (4D).

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          Foxd1-dependent signals control cellularity in the renal capsule, a structure required for normal renal development.

          Christopher Choi, Ekatherina Batourina, Jan K Kitajewski … (2005)
          Development of the metanephric kidney involves the establishment of discrete zones of induction and differentiation that are crucial to the future radial patterning of the organ. Genetic deletion of the forkhead transcription factor, Foxd1, results in striking renal abnormalities, including the loss of these discrete zones and pelvic fused kidneys. We have investigated the molecular and cellular basis of the kidney phenotypes displayed by Foxd1-null embryos and report here that they are likely to be caused by a failure in the correct formation of the renal capsule. Unlike the single layer of Foxd1-positive stroma that comprises the normal renal capsule, the mutant capsule contains heterogeneous layers of cells, including Bmp4-expressing cells, which induce ectopic phospho-Smad1 signaling in nephron progenitors. This missignaling disrupts their early patterning, which, in turn, causes mispatterning of the ureteric tree, while delaying and disorganizing nephrogenesis. In addition, the defects in capsule formation prevent the kidneys from detaching from the body wall, thus explaining their fusion and pelvic location. For the first time, functions have been ascribed to the renal capsule that include delineation of the organ and acting as a barrier to inappropriate exogenous signals, while providing a source of endogenous signals that are crucial to the establishment of the correct zones of induction and differentiation.
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            EMAP and EMAGE: a framework for understanding spatially organized data.

            Yiya Yang, Carl G. Feng, Alisha D. Davidson … (2002)
            The Edinburgh MouseAtlas Project (EMAP) is a time-series of mouse-embryo volumetric models. The models provide a context-free spatial framework onto which structural interpretations and experimental data can be mapped. This enables collation, comparison, and query of complex spatial patterns with respect to each other and with respect to known or hypothesized structure. The atlas also includes a time-dependent anatomical ontology and mapping between the ontology and the spatial models in the form of delineated anatomical regions or tissues. The models provide a natural, graphical context for browsing and visualizing complex data. The Edinburgh Mouse Atlas Gene-Expression Database (EMAGE) is one of the first applications of the EMAP framework and provides a spatially mapped gene-expression database with associated tools for data mapping, submission, and query. In this article, we describe the underlying principles of the Atlas and the gene-expression database, and provide a practical introduction to the use of the EMAP and EMAGE tools, including use of new techniques for whole body gene-expression data capture and mapping.
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              The role of GDNF/Ret signaling in ureteric bud cell fate and branching morphogenesis.

              Frank Costantini, Reena Shakya, Tomoko Watanabe (2004)
              While GDNF signaling through the Ret receptor is critical for kidney development, its specific role in branching morphogenesis of the epithelial ureteric bud (UB) is unclear. Ret expression defines a population of UB "tip cells" distinct from cells of the tubular "trunks," but how these cells contribute to UB growth is unknown. We have used time-lapse mosaic analysis to investigate normal cell fates within the growing UB and the developmental potential of cells lacking Ret. We found that normal tip cells are bipotential, contributing to both tips and trunks. Cells lacking Ret are specifically excluded from the tips, although they contribute to the trunks, revealing that the tips form and expand by GDNF-driven cell proliferation. Surprisingly, the mutant cells assumed an asymmetric distribution in the UB trunks, suggesting a model of branching in which the epithelium of the tip and the adjacent trunk is remodeled to form new branches.
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                Author and article information

                Journal
                Journal ID (publisher-id): NEE
                Journal ID (nlm-ta): Nephron Exp Nephrol
                Journal ID (doi): 10.1159/issn.1660-2129
                Title: Cardiorenal Medicine
                Publisher: S. Karger AG
                ISBN: 978-3-8055-8074-8
                ISBN: 978-3-318-01315-3
                ISSN (Electronic): 1660-2129
                Publication date Subscription-year: 2006
                Publication date (Print): March 2006
                Publication date (Electronic): 13 March 2006
                Volume: 103
                Issue: 2
                Pages: e62-e68
                Affiliations
                Department of Anatomy and Cell Biology, School of Biomedical Sciences, Monash University, Clayton, Australia
                Article
                Publisher ID: 90618 Other ID: Nephron Exp Nephrol 2006;103:e62–e68
                DOI: 10.1159/000090618
                PubMed ID: 16543766
                SO-VID: 3c86b37f-69c7-42ef-968b-2074a2e0ba15
                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
                Page count
                Figures: 3, References: 34, Pages: 1
                Categories
                Subject: Microscopic Imaging

                ScienceOpen disciplines: Cardiovascular Medicine,Nephrology
                Keywords: Embryonic kidney,Optical projection tomography,Protein-reporter,Metanephros,3D imaging
                Data availability:
                ScienceOpen disciplines: Cardiovascular Medicine, Nephrology
                Keywords: Embryonic kidney, Optical projection tomography, Protein-reporter, Metanephros, 3D imaging

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