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575 Pages·2015·61.414 MB·English
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KIDNEY DEVELOPMENT, DISEASE, REPAIR AND REGENERATION Edited by M H. l elissa ittle AMSTERDAM • BOSTON • HEIDELBERG • LONDON NEW YORK • OXFORD • PARIS • SAN DIEGO SAN FRANCISCO • SINGAPORE • SYDNEY • TOKYO Academic Press is an imprint of Elsevier Academic Press is an imprint of Elsevier 125 London Wall, London EC2Y 5AS, UK 525 B Street, Suite 1800, San Diego, CA 92101-4495, USA 225 Wyman Street, Waltham, MA 02451, USA The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, UK Copyright © 2016 Elsevier Inc. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Details on how to seek permission, further information about the Publisher’s permissions policies and our arrangements with organizations such as the Copyright Clearance Center and the Copyright Licensing Agency, can be found at our website: www.elsevier.com/permissions. This book and the individual contributions contained in it are protected under copyright by the Publisher (other than as may be noted herein). Notices Knowledge and best practice in this field are constantly changing. As new research and experience broaden our understanding, changes in research methods, professional practices, or medical treatment may become necessary. Practitioners and researchers must always rely on their own experience and knowledge in evaluating and using any information, methods, compounds, or experiments described herein. In using such information or methods they should be mindful of their own safety and the safety of others, including parties for whom they have a professional responsibility. To the fullest extent of the law, neither the Publisher nor the authors, contributors, or editors, assume any liability for any injury and/or damage to persons or property as a matter of products liability, negligence or otherwise, or from any use or operation of any methods, products, instructions, or ideas contained in the material herein. Medical Disclaimer Medicine is an ever-changing field. Standard safety precautions must be followed, but as new research and clinical experience broaden our knowledge, changes in treatment and drug therapy may become necessary or appropriate. Readers are advised to check the most current product information provided by the manufacturer of each drug to be administered to verify the recommended dose, the method and duration of administrations, and contraindications. It is the responsibility of the treating physician, relying on experience and knowledge of the patient, to determine dosages and the best treatment for each individual patient. Neither the publisher nor the authors assume any liability for any injury and/or damage to persons or property arising from this publication. ISBN: 978-0-12-800102-8 British Library Cataloguing-in-Publication Data A catalogue record for this book is available from the British Library Library of Congress Cataloging-in-Publication Data A catalog record for this book is available from the Library of Congress For information on all Academic Press publications visit our website at http://store.elsevier.com/ Typeset by TNQ Books and Journals www.tnq.co.in Printed and bound in the United States of America Contributors Qais Al-Awqati Department of Medicine, Columbia Benjamin Dekel Pediatric Stem Cell Research Institute, University College of Physicians & Surgeons, New York, Edmond & Lili Safra Children’s Hospital, Sheba Medical NY, USA Center, Sackler School of Medicine, Tel Aviv University, Tel H.H. Arts Department of Human Genetics, Radboud Aviv, Israel; Division of Pediatric Nephrology, Edmond & Lili Safra Children’s Hospital, Sheba Medical Center, Institute for Molecular Life Sciences, Radboudumc, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Nijmegen, The Netherlands Israel Anthony Atala Wake Forest School of Medicine, Wake Rachel C. Dodd Department of Molecular Medicine & Forest Institute for Regenerative Medicine, Winston-Salem, Pathology, School of Medical Sciences, Faculty of Medical NC, USA Health Sciences, The University of Auckland, Auckland, Felicity J. Barnes Department of Anatomy and New Zealand Developmental Biology, Monash University, Clayton, Gregory R. Dressler Department of Pathology, University VIC, Australia of Michigan, Ann Arbor, MI, USA Ariela Benigni IRCCS — Istituto di Ricerche Farmacologiche Jeremy S. Duffield Research & Development, Biogen, “Mario Negri”, Centro Anna Maria Astori, Science & Cambridge, MA, USA; Departments of Medicine & Technology Park Kilometro Rosso Bergamo, Italy Pathology, University of Washington, Seattle, WA, USA John F. Bertram Department of Anatomy and Developmental Klaudyna Dziedzic Pediatric Stem Cell Research Institute, Biology, School of Biomedical Sciences, Monash University, Edmond & Lili Safra Children’s Hospital, Sheba Medical Melbourne, VIC, Australia Center, Sackler School of Medicine, Tel Aviv University, M. Jane Black Department of Anatomy and Developmental Tel Aviv, Israel Biology, Monash University, Melbourne, VIC, Australia David A. Ferenbach Renal Division and Biomedical Joseph V. Bonventre Renal Division and Biomedical Engineering Division, Brigham and Women’s Hospital, Engineering Division, Brigham and Women’s Hospital, Department of Medicine, Harvard Medical School, Boston, Department of Medicine, Harvard Medical School, Boston, MA, USA; Centre for Inflammation Research, Queen’s MA, USA; Division of Health Sciences and Technology, Medical Research Institute, University of Edinburgh, Harvard-Massachusetts Institute of Technology, Edinburgh, UK Cambridge, MA, USA; Harvard Stem Cell Institute, Julia B. Finkelstein Department of Urology, Columbia Cambridge, MA, USA University College of Physicians and Surgeons, New York, Deborah A. Buffington Innovative BioTherapies, NY, USA Incorporated, Ann Arbor, MI, USA Paul Goodyer Department of Pediatrics, McGill University, Kevin T. Bush Department of Pediatrics, University of Montreal, QC, Canada; Department of Human Genetics, California, San Diego, La Jolla, CA, USA McGill University, Montreal, QC, Canada Qi Cao Centre for Transplant and Renal Research, L.M. Guay-Woodford Center for Translational Science, Westmead Millennium Institute, University of Sydney at Children’s National Health System, Washington, DC, USA Westmead Hospital, Westmead, NSW, Australia Marc R. Hammerman Renal Division, Departments of Thomas Carroll Departments of Molecular Biology and Medicine, and Cell Biology and Physiology, Washington Internal Medicine (Nephrology), University of Texas University School of Medicine, St. Louis, MO, USA Southwestern Medical Center, Dallas, TX, USA David C.H. Harris Sydney Medical School – Western Melanie Cosgrove Department of Experimental Medicine, Centre for Transplant and Renal Research, Westmead McGill University, Montreal, QC, Canada Millennium Institute, University of Sydney at Westmead Frank Costantini Department of Genetics and Development, Hospital, Westmead, NSW, Australia Columbia University, New York, NY, USA Michael J. Hiatt Developmental Biology and Regenerative Luise Cullen-McEwen Department of Anatomy and Medicine Program, The Saban Research Institute, Children’s Developmental Biology, Monash University, Melbourne, Hospital Los Angeles, University of Southern California, VIC, Australia Los Angeles, CA, USA Alan J. Davidson Department of Molecular Medicine & Wendy E. Hoy Centre for Chronic Disease, University of Pathology, School of Medical Sciences, Faculty of Medical Queensland, Brisbane, QLD, Australia Health Sciences, The University of Auckland, Auckland, Michael D. Hughson Department of Pathology, University New Zealand of Mississippi Medical Center, Jackson, MS, USA xi xii CONTRIBUTORS Jennifer C. Huling Wake Forest School of Medicine, Wake Sanjay K. Nigam Department of Pediatrics, University of Forest Institute for Regenerative Medicine, Winston-Salem, California, San Diego, La Jolla, CA, USA; Department of NC, USA; School of Biomedical Engineering and Sciences, Medicine, University of California, San Diego, La Jolla, Virginia Tech-Wake Forest University, Winston-Salem, NC, CA, USA; Department of Cellular & Molecular Medicine, USA University of California, San Diego, La Jolla, CA, USA H. David Humes Innovative BioTherapies, Incorporated, Ryuichi Nishinakamura Department of Kidney Ann Arbor, MI, USA; The University of Michigan, Ann Development, Institute of Molecular Embryology and Arbor, MI, USA Genetics, Kumamoto University, Kumamoto, Japan Benjamin D. Humphreys Renal Division, Brigham and A.K. O’Connor Center for Translational Science, Children’s Women’s Hospital, Boston, MA, USA; Harvard Medical National Health System, Washington, DC, USA School, Boston, MA, USA; Harvard Stem Cell Institute, Juan A. Oliver Department of Medicine, Columbia Cambridge, MA, USA University College of Physicians & Surgeons, New York, Roger Ilagan Division of Regenerative Medicine, United NY, USA Therapeutics Corporation, Research Triangle Park, NC, USA Kenji Osafune Center for iPS Cell Research and Nine V.A.M. Knoers Department of Medical Genetics, Application (CiRA), Kyoto University, Shogoin, Sakyo-ku, University Medical Centre Utrecht, Utrecht, The Kyoto, Japan Netherlands Leif Oxburgh Center for Molecular Medicine, Maine Raphael Kopan Division of Developmental Biology, Medical Center Research Institute, ME, USA Cincinnati Children’s Hospital, Cincinnati, OH, USA Joo-Seop Park Division of Pediatric Urology, Cincinnati Jordan A. Kreidberg Department of Medicine, Boston Children’s Hospital, Cincinnati, OH, USA; Division of Children’s Hospital, and Department of Pediatrics, Developmental Biology, Cincinnati Children’s Hospital, Harvard Medical School, Boston, MA, USA Cincinnati, OH, USA Callie S. Kwartler Departments of Molecular Biology and Anna Peired Excellence Centre for Research, Transfer and Internal Medicine (Nephrology), University of Texas High Education for the Development of DE NOVO Southwestern Medical Center, Dallas, TX, USA Therapies (DENOTHE), University of Florence, Florence, Laura Lasagni Excellence Centre for Research, Transfer and Italy High Education for the Development of DE NOVO Christopher J. Pino Innovative BioTherapies, Incorporated, Therapies (DENOTHE), University of Florence, Florence, Ann Arbor, MI, USA Italy Oren Pleniceanu Pediatric Stem Cell Research Institute, Elena Lazzeri Excellence Centre for Research, Transfer and Edmond & Lili Safra Children’s Hospital, Sheba Medical High Education for the Development of DE NOVO Center, Sackler School of Medicine, Tel Aviv University, Therapies (DENOTHE), University of Florence, Florence, Tel Aviv, Israel Italy Sharon Presnell Organovo, Inc., San Diego, CA, USA Melissa H. Little The Institute for Molecular Bioscience, Victor G. Puelles Department of Anatomy and The University of Queensland, Brisbane, QLD, Australia Developmental Biology, School of Biomedical Sciences, Weining Lu Department of Medicine, Boston University Monash University, Melbourne, VIC, Australia School of Medicine, Boston Medical Center, Boston, MA, Susan E. Quaggin Division of Nephrology and USA Hypertension, Feinberg School of Medicine, Northwestern Daniela Macconi IRCCS — Istituto di Ricerche University, Chicago, IL, USA Farmacologiche “Mario Negri”, Centro Anna Maria Astori, Ton J. Rabelink Department of Nephrology, Leiden Science & Technology Park Kilometro Rosso Bergamo, Italy University Medical Center, Leiden, The Netherlands; Douglas G. Matsell Child and Family Research Institute, Department of Nephrology, Einthoven Laboratory for British Columbia Children’s Hospital, University of British Experimental Vascular Medicine, Leiden University Columbia, Vancouver, BC, Canada Medical Center, Leiden, The Netherlands Andrew P. McMahon Department of Stem Cell Biology and Egon Ranghini Department of Pathology, University of Regenerative Medicine, Eli and Edythe Broad-CIRM Michigan, Ann Arbor, MI, USA Center for Regenerative Medicine and Stem Cell Research, Scott Rapoport Division of Regenerative Medicine, United WM Keck School of Medicine of the University of Therapeutics Corporation, Research Triangle Park, NC, Southern California, Los Angeles, CA, USA USA Cathy Mendelsohn Departments of Urology, Genetics and Marlies E.J. Reinders Department of Nephrology, Leiden Development and Pathology, Columbia University, University Medical Center, Leiden, The Netherlands New York, NY, USA Giuseppe Remuzzi IRCCS — Istituto di Ricerche Marcus J. Moeller Department of Nephrology and Farmacologiche “Mario Negri”, Centro Anna Maria Astori, Immunology, RWTH Aachen University, Aachen, Germany Science & Technology Park Kilometro Rosso Bergamo, Karen M. Moritz School of Biomedical Science, The Italy; Unit of Nephrology and Dialysis, Azienda University of Queensland, St Lucia, QLD, Australia Ospedaliera Papa Giovanni XXIII, Bergamo, Italy CONTRIBUTORS xiii Sharon D. Ricardo Department of Anatomy and Megan R. Sutherland CHU Sainte-Justine Research Center Developmental Biology, Monash University, Clayton, VIC, and the University of Montreal, Montreal, QC, Canada Australia Atsuhiro Taguchi Department of Kidney Development, Paola Romagnani Excellence Centre for Research, Transfer Institute of Molecular Embryology and Genetics, and High Education for the Development of DE NOVO Kumamoto University, Kumamoto, Japan Therapies (DENOTHE), University of Florence, Florence, Yiping Wang Centre for Transplant and Renal Research, Italy; Pediatric Nephrology Unit, Meyer Children’s Westmead Millennium Institute, University of Sydney at Hospital, University of Florence, Florence, Italy Westmead Hospital, Westmead, NSW, Australia Rizaldy P. Scott Division of Nephrology and Hypertension, Stefanie Weber Pediatrics II, University Children’s Hospital Feinberg School of Medicine, Northwestern University, Essen, Essen, Germany Chicago, IL, USA Angela J. Westover Innovative BioTherapies, Incorporated, Maria Luisa S. Sequeira Lopez University of Virginia Ann Arbor, MI, USA School of Medicine, Charlottesville, VA, USA Takashi Yokoo Division of Nephrology and Hypertension, Benjamin Shepherd Division of Regenerative Medicine, Department of Internal Medicine, The Jikei University United Therapeutics Corporation, Research Triangle Park, School of Medicine, Tokyo, Japan NC, USA James J. Yoo Wake Forest School of Medicine, Wake Forest Kieran M. Short Department of Biochemistry and Molecular Institute for Regenerative Medicine, Winston-Salem, NC, Biology, Monash University, Melbourne, VIC, Australia USA Ian M. Smyth Department of Biochemistry and Molecular Jing Yu Department of Cell Biology, Child Health Research Biology, Monash University, Melbourne, VIC, Australia; Center, the Center for Immunity, Inflammation and Department of Anatomy and Developmental Biology, Regenerative Medicine, University of Virginia School of Monash University, Melbourne, VIC, Australia Medicine, Charlottesville, VA, USA Katalin Susztak Renal Electrolyte and Hypertension Division, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA Foreword According to ancient Greek mythology the Titan Prometheus was punished by Zeus for stealing fire from the gods and handing it over to mortal humans. His punishment consisted of being chained to the Caucasus mountains, where he had to suffer an eagle feasting daily on his liver, which would then regenerate overnight. Out of this mythology arose the great hope that all organs, if damaged, could regenerate. Unfortunately, in humans the enormous regenerative capacity of the liver seems to be the exception rather than the rule. None- theless, all organs, including the kidney, have some ability to regenerate or repair injured renal structures. In nephrology this is most obvious in the case of acute tubular injury. The limitations for renal regeneration may be imposed by the very complicated intrinsic anatomical structure of the nephron and the functional intercon- nection of its different components as the basic building blocks of the kidney. Therefore, and in spite of some regeneration of damaged nephron segments, the overall renal function declines in many forms of renal injury. This leads to progression of injury and chronic kidney disease (CKD), which remains a major problem with unfortunately a dearth of effective therapeutic interventions. It is because of this that possible regenerative ther- apeutic approaches, whether to prevent or slow down progression of CKD or even for replacement of destroyed nephrons, are increasingly attracting interest. In this context one has to recall that such regenerative therapeutic interventions will draw on the basic understanding of normal embryonic developmental of the kidney, and that understanding the molecular basis of these processes will be the key to the development of regenerative thera- pies for chronic renal disease. In this book Professor Melissa Little has successfully undertaken the very difficult task of bringing together and editing texts encompassing the vast amount of information, ranging from basic embryology of the kidney all the way to exploring potential ways of using this basic knowledge to repair or regenerate parts or even entire nephrons or their function. The list of authors reads like a “Who’s who” of experts for all aspects of kidney development, injury response, cell differentiation and de-differentiation, repair processes, their signaling processes and the specific cells involved, and the various types of stem cells and their biology, with special emphasis on the potential therapeutic use of renal and non-renal adult and embryonic stem cells. In order to connect these various aspects into a logical and understandable framework the initial chapters are devoted to the basics of renal development. They expand to illustrate the similarities and differences between developmental processes and those recapitulated during renal injury and repair using various model systems. This includes aspects of genetics and epigenetics during development as well as in disease processes. Having described this for the entire kidney, subsequent chapters explore these aspects for specific nephron segments, from the glom- erulus down to the collecting tubule and upper urinary tract, and also for the renal vasculature and stroma. For each nephron segment, diseases resulting from genetic and environmental developmental abnormalities are discussed in terms of their molecular and cellular pathogenesis. Finally, mechanisms and limitations of repair and/or regenera- tion of specific cell types along the nephron are critically analyzed. In this context, the use of lineage tracing has been critical to differentiate regeneration from intrarenal versus bone- marrow derived progenitor cells. Furthermore, it appears that instead of a single type of kidney stem cell to replace lost or damaged kidney tissue, there are nephron segment-specific progenitor cells which give rise to new cells within each kidney compartment. Equally important is the identification of pathways that govern the proliferation and differentiation of regeneration-competent cells, and the signals that inhibit their activity after injury. In addition to the possibility of intra-renal repair and regeneration of nephrons, the possibilities of growing entirely new struc- tural and functional nephrons or even kidneys are discussed and the creation of bio-engineered kidneys or partial replacement of kidney functions are addressed. The authors point out the potential for the application of many of these novel regenerative approaches, but also caution about the many remaining hurdles. These include problems of adequately identifying renal stem cell populations and assessing their therapeutic potential. Also the unique architecture of the kidney compli- cates the anatomical and functional integration of stem cell–derived nephrons. This may apply even more to the functional capacity of a bioengineered organ to partially or completely replace the endogenous kidney. In spite of these difficulties, the road ahead for regenerative therapy is exciting and many obstacles may be overcome based on the enormous strides forward achieved in genetics, molecular and cell biology, and especially stem cell biology. xv xvi FOREWORD Taken together this book provides a state of the art compendium of our present knowledge and of future perspec- tives for all aspects of regenerative kidney repair and therapy. As such it represents a pioneering and gigantic step forward in this exciting new field. Just as Prometheus brought fire to mortal humans, the authors of this excellent text bring light and hope to all of us nephrologists dwelling in the present penumbra surrounding the therapy of acute and chronic kidney injury. Detlef Schlöndorff Detlef Schlöndorff, MD is currently visiting professor of medicine at the Icahn School of Medicine at Mount Sinai in New York, USA, and Editor-in-Chief of Kidney International. He is Professor Emeritus of the Ludwig Maximilians University of Munich, Germany. Acknowledgments The kidneys, from the perspectives of functional diversity and cellular complexity, are one of the most remark- able organs in our body. This has undoubtedly contributed to the challenge of replacing renal function. Indeed, at a point in history where chronic renal disease is rapidly increasing in prevalence, the need for alternative approaches to ensuring ongoing renal function is acute. Fully understanding the organ itself is surely the basis upon which such solutions will arise. My personal foray into the biology of the kidney commenced as an Honours student in Physiology examining the rate of production and degradation of angiotensinogen in a rat model. Serendipitously, I moved from this to a research position in childhood cancer, focussing on the molecular basis of the childhood kidney cancer, Wilms’ tumour, at a time just before the WT1 gene was identified. As a postdoctoral researcher in the United Kingdom, under the mentorship of Professor Nicholas Hastie (then of the MRC Human Genetics Unit, Edinburgh) we began to unravel the link between WT1 and kidney/gonad development and dysmorphogenesis, identifying mutations in the developmental anomaly syndrome, Denys Drash syndrome. This piqued my interest in how the development of this fascinating organ was controlled. What followed was not only a journey through kidney biol- ogy, but one that ranged across developmental molecular biology, through systems biology, experimental nephrol- ogy and ultimately stem cell biology and regenerative medicine. Hence, bringing together this collection of stories is a reflection of my own scientific journey. For the first time in one location, the reader can bridge that spectrum from how the kidney forms, what can go wrong, how the organ attempts to cope with injury and finally how we might build on this knowledge to recreate structure and function. The end product is the work of many. As always, my family deserves special mention for their endless patience with my obsession for work. Having their love and support makes me human and the interspersed chaos and joy of normal life brings the light and colour that makes the rest worth it. I particularly thank my son, Nathaniel Rhoades, who helped me with production of graphic plates. The dedicated work of my own team of researchers (past and present), not only in generating some of the science discussed within these pages but continuing to deliver in response to my tireless enthusiasm, definitely needs acknowledgement. I thank Jeff Rossetti and Edward Taylor for calmly overseeing the project as timelines walked into the distance. Most of all, I am indebted to the spectacular scientists who wrote the component chapters. You are also my heroes, colleagues and mentors, and I thank you for your contributions to the book in the face of the many clinical, scientific and personal demands on your own lives. I particularly thank Lisa Guay-Woodford and Weining Lu who accepted either more than was first anticipated or were brought in late with short timelines. In building this book, I have learnt much from the individual chapters and the perspective of each set of authors on their particular areas of expertise. To see it complete reinforces my conviction that it was time to marry together these seemingly disparate areas of research around the commonality of the clinical challenge that is kidney failure. Revealing, but exciting, is what there is yet to understand and what might be achieved in the coming decades. Professor Melissa H Little NHMRC Senior Principal Research Fellow Murdoch Children’s Research Institute & Department of Pediatric University of Melbourne Australia xvii S E C T I O N I DEVELOPMENT A functioning kidney is vital for life. While most are familiar with the excretory functions of the kidney, this com- plex organ also modulates fluid volume, blood pressure, red cell count and bone density, thereby acting as a central regulator of homeostasis. While a fundamental understanding of normal organ morphogenesis is clearly relevant for the interpretation of congenital anomaly, there is a growing appreciation that normal kidney morphogenesis is crucial for long term renal function. In humans, as in most mammals, nephron formation is a fetal event with final nephron number set before or near birth. Evidence in humans for a 10 fold variation in nephron number between individuals, no capacity to form new nephrons after birth and a clear inverse relationship between nephron number and renal disease, has refocussed our attention on how the kidney forms and what determines an optimal outcome. In all amniotes, three excretory organs formed during embryogenesis. The permanent kidney in humans (and all mammals) is the third of these structures to form; the metanephros. Despite this, there are lessons to be learnt even from the non-mammalian kidney. The molecular paradigms described in pronephric development in the fish show remarkable parallels with those used for the elaboration of the much more complex mammalian metanephros. Chapter 1 will describe the differences in approach to nephron endowment, repair and response to growth that exist in fish. The developmental origin of these excretory structures is addressed in Chapter 2. Studies on metanephric development have focussed on mammalian models such as mouse, rat, sheep, pig and baboon. Of these, mouse is the most amenable to genetic manipulation, including lineage tracing to investigate cellular ontogeny as well as compartment specific gene deletion or activation. The accessibily of such model organisms, together with the simplicity of genetic manipulation and visualisation, has allowed us to acquire much information about morpho- genesis in simpler excretory organs. While studies of kidney morphogenesis in mouse have significantly improved our knowledge of the pathways involved in kidney morphogenesis, a mouse is not a human. Indeed, substantial differences exist in the histological structure or kidneys between different mammals. Chapter 3 will address human kidney morphogenesis and how this differs from morphogenesis in other model organisms. Understanding these differences may also inform us about approaches to modify development or repair in the human. The metanephros is generated from four major progenitor populations that give rise to the branching collecting duct tree (ureteric bud), the nephrons (cap mesenchyme), interstitial elements, including the mesangium and pericytes (stroma) and the vasculature (vascular progenitors). Chapter 4 discusses the regulation of patterning of the ureteric epithelium. The challenge in studying morphogenesis in all mammalian species remains the size and cellular complexity. Chapter 5 begins to address this in the mouse, illustrating both what level of quantitative morphoge- netic analyses might be possible as well as highlighting what we have missed to date. The nephrons arise from the cap mesenchyme. Our understanding of what specifies this population and how the balance between self-renewal and commitment to nephron formation is regulated is discussed in Chapters 6 and 7. The nascent nephron has to undergo substantial elongation, patterning and segmentation to generate the required functional compartmentalisa- tion essential for nephron function (Chapter 8). Regulation of nephron number in the human is discussed in Chapter 9. Most critical for nephron function is the differentiation of a vascularised glomerulus with podocytes and endothelial cells forming a functional glomerular basement membrane. The molecular regulation of this process will be discussed in Chapter 10. Chapter 11 then discusses how different segments of these elongating and maturing nephrons are directed to the appropriate location to form the final organ. The influence of the surrounding stroma on this process is covered by Chapter 12. Finally, our current understanding of how the vasculature of the kidney arises will be presented in Chapter 13.

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