Membrane Transport And Renal Physiology

The papers in this volume arose out of the workshop Membrane Transport and Renal Physiology, which was conducted as part of the IMA 1998-1999 program year, Mathematics in Biology. The workshop brought together physiologists, biophysicists, and applied mathematicians who share a common interest in solute and water transport in biological systems, especially in the integrated function of the kidney. Solute and water transport through cells involves fluxes across two cell membranes, usually via specialized proteins that are integral membrane components. By means of mathematical representations, transport fluxes can be related to transmembrane solute concentrations and electrochemical driving forces. At the next level of functional integration, these representations can serve as key components for models of renal transcellular transport. Ultimately, simulations can be developed for transport-dependent aspects of overall renal function. Workshop topics included solute fluxes through ion channels, cotransporters, and metabolically-driven ion pumps; transport across fiber-matrix and capillary membranes; coordinated transport by renal epithelia; the urine concetrating mechanism; and intra-renal hemodynamic control. This volume will be of interest to biological and mathematical scientists who would like a view of recent mathematical efforts to represent membrane transport and its role in renal function.

The papers in this volume arose out of the workshop Membrane Transport and Renal Physiology, which was conducted as part of the IMA 1998-1999 program year, Mathematics in Biology. The workshop brought together physiologists, biophysicists, and applied mathematicians who share a common interest in solute and water transport in biological systems, especially in the integrated function of the kidney. Solute and water transport through cells involves fluxes across two cell membranes, usually via specialized proteins that are integral membrane components. By means of mathematical representations, transport fluxes can be related to transmembrane solute concentrations and electrochemical driving forces. At the next level of functional integration, these representations can serve as key components for models of renal transcellular transport. Ultimately, simulations can be developed for transport-dependent aspects of overall renal function. Workshop topics included solute fluxes through ion channels, cotransporters, and metabolically-driven ion pumps; transport across fiber-matrix and capillary membranes; coordinated transport by renal epithelia; the urine concetrating mechanism; and intra-renal hemodynamic control. This volume will be of interest to biological and mathematical scientists who would like a view of recent mathematical efforts to represent membrane transport and its role in renal function.

This book is a collection of reviews on the renal transport of organic substances. The first chapters deal with general aspects of the topic. The following articles treat the present knowledge on the renal trans port of specific compounds or classes of organic substances, whereas the fmal chapter on comparative physiology deals with the renal trans port of organic substances in non-mammalian vertebrates. The articles of this volume were presented in an abbreviated form as introductory lectures at a recent Symposium on Renal Transport of Organic Substances. This conference was organized by Prof. Deetjen and the editors, and was held in Innsbruck, Austria, in July 1980 at the Department of Physiology of the University of Innsbruck. During this conference the authors of the free communications (published as abstracts ill Renal Physiology, 2 (3), pp 135-166 (1980) as well as Drs. C. Gottschalk, T. Hoshi, K.C. Huang, J.P. Kokko, Ch. de Rouffignac, K. Scharer, BM. Schmidt-Nielsen, and J.A. Young, who acted as chair persons at the meeting, were invaluable contributors to the discussions of the topics reviewed in this volume. We hope that the book will be of value to nephrologists, to renal physiologists, and to those who are involved in teaching physiology, pharmacology, and internal medicine.

Clinical Disorders of Membrane Transport Processes is a softcover book containing a portion of Physiology of Membrane Disorders (Second Edition). The parent volume contains six major sections that deal with general aspects of the physiology of transport processes and specific aspects of transport processes in cells and in organized cellular systems, namely epithelia. This text contains the last section, which deals with the application of the physiology of transport processes to the understanding of clinical disorders. We hope that this smaller volume will be helpful to individuals particularly interested in clinical derangements of membrane transport processes. THOMAS E. ANDREOLI JOSEPH F. HOFFMAN DARRELL D. FANESTIL STANLEY G. SCHULTZ Vll Preface to the Second Edition The second edition of Physiology of Membrane Disorders represents an extensive revision and a considerable expansion of the fIrst edition. Yet the purpose of the second edition is identical to that of its predecessor, namely, to provide a rational analysis of membrane transport processes in individual membranes, cells, tissues, and organs, which in tum serves as a frame of reference for rationalizing disorders in which derangements of membrane transport processes playa cardinal role in the clinical expression of disease. As in the fIrst edition, this book is divided into a number of individual, but closely related, sections. Part V represents a new section where the problem of transport across epithelia is treated in some detail. Finally, Part VI, which analyzes clinical derangements, has been enlarged appreciably.

The first edition of this book appeared in 1982. In the preface to that first edi tion, I wrote 'This book is based on the lecture course in renal physiology which I give to medical students at the University of Birmingham. The pur pose of the book is primarily to set out the principles of renal physiology for preclinical medical students, and it is therefore concerned mainly with normal renal function. However, diseases or abnormalities in other body systems may lead to adaptations or modifications of renal function, so that a good knowl edge of renal physiology is essential to the understanding of many disease states, for example the oedema of heart failure or liver disease, or the conse quences of haemorrhage and shock. ' The new edition is still based on the lec tures which I continue to give at Birmingham University, but over the years the course has gradually changed, to being a system based course covering all aspects of the kidney - the anatomy, physiology, pharmacology and pathology. The new edition of the book, which has been extensively revised and rewritten, reflects this. However, it continues to offer a concise, easily readable format, primarily intended for undergraduate medical and medical science students.

The second edition of Physiology of Membrane Disorders represents an extensive revision and a considerable expansion of the first edition . Yet the purpose ofthe second edition is identical to that of its predecessor, namely, to provide a rational analysis of membrane transport processes in individual membranes, cells, tissues, and organs, which in tum serves as a frame of reference for rationalizing disorders in which derangements of membrane transport processes playa cardinal role in the clinical expression of disease. As in the first edition, this book is divided into a number of individual, but closely related, sections. Part V represents a new section where the problem of transport across epithelia is treated in some detail. Finally, Part VI, which analyzes clinical derangements, has been enlarged appreciably. THE EDITORS xi Preface to the First Edition The purpose of this book is to provide the reader with a rational frame of reference for assessing the pa thophysiology of those disorders in which derangements of membrane transport processes are a major factor responsible for the clinical manifestations of disease. In the present context, we use the term "membrane transport to refer to those molecular processes whose cardinal function, broadly speaking, is processes" in a catholic sense, the vectorial transfer of molecules-either individually or as ensembles-across biological interfaces, the latter including those interfaces which separate different intracellular compartments, the cellular and extracellular com partments, and secreted fluids-such as glomerular filtrate-and extracellular fluids.

Membrane Physiology is a soft-cover book containing portions of Physiology of Membrane Disorders, published in larger, hard-cover form in 1978. The parent volume was divided into five parts, described in detail in the Preface to the hard-cover edition, which is reproduced in this volume. The present version of Membrane Physiology incorporates the first three of these parts, including a section on the Nature of Biological Membranes, a section on Methods for Studying Membranes, and a section on General Problems in Membrane Biology. It is the hope of the Editors that this smaller volume will be of value to individuals interested in general physiology, the methods for studying general physiology, and its potential application to problems of clinical and physiological relevance. The Preface to Physiology of Membrane Disorders indicates our general reasoning for developing such a volume. THOMAS E. ANDREOLI JOSEPH F. HOFFMAN DARRELL D. FANESTIL Vll Preface to Physiology of Membrane Disorders The purpose of this book is to provide the reader with a rational frame of reference for assessing the pathophysiology of those disorders in which derangements of membrane transport processes are a major factor responsible for the clinical manifestations of disease.