Links Among Neuronal Nitric Oxide Synthase, Oxidative Stress, and Asymmetric Dimethylarginine (Adma)
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NITRIC OXIDE DEFICIENCY IN CHRONIC KIDNEY DISEASE: LINKS AMONG NEURONAL NITRIC OXIDE SYNTHASE, OXIDATIVE STRESS, AND ASYMMETRIC DIMETHYLARGININE (ADMA) By YOU-LIN TAIN A DISSERTATION PRESENTED TO THE GRADUATE SCHOOL OF THE UNIVERSITY OF FLORIDA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY UNIVERSITY OF FLORIDA 2007 1 © 2007 You-Lin Tain 2 This dissertation is dedication to my family for their constant love 3 ACKNOWLEDGMENTS This dissertation would not have been possible without the support of many people. Many thanks go to my adviser: Dr. Chris Baylis gave me the chance to work on many projects and also gave me numerous valuable comments for my manuscripts. I would like to thank my committee members for their guidance and valuable comments: Dr. Richard Johnson, Dr. Mohan Raizada, and Dr. Mark Segal. I thanks also go to the Chang Gung Memorial Hospital for awarding me a fellowship, providing me with the financial means to complete this dissertation. I am grateful to many persons who shared their technical assistance and experience, especially Dr. Verlander and Dr. Chang (University of Florida), Dr. Muller and Dr. Szabo (Semmelweis University, Hungary), Dr. Griendling and Dr. Dikalova (Emory University), and Dr. Merchant and Dr. Klein (University of Louisville). Next, I would like to thank all of the members of Dr. Baylis lab, both past and present, with whom I have been fortunate enough to work: Dr. Aaron Erdely, Gerry Freshour, Kevin Engels, Lennie Samsell, Dr. Sarah Knight, Dr. Cheryl Smith, Dr. Jenny Sasser, Harold Snellen, Bruce Cunningham, Gin-Fu Chen, and Natasha Moningka. I will miss all of them. Finally, thanks go to my wife, CN, and numerous friends who endured this long process with me, always offering support and love. 4 TABLE OF CONTENTS page ACKNOWLEDGMENTS ...............................................................................................................4 LIST OF TABLES...........................................................................................................................8 LIST OF FIGURES .........................................................................................................................9 ABSTRACT...................................................................................................................................12 CHAPTER 1 INTRODUCTION ..................................................................................................................14 Overview.................................................................................................................................14 Chronic Kidney Disease Is a Global Challenge ..............................................................14 Nitric Oxide Deficiency Is a Common Mechanism of CKD Progression.......................14 Neuronal Nitric Oxide Synthase.............................................................................................15 Role of Renal Cortical Neuronal Nitric Oxide Synthase in Chronic Kidney Disease Progression...................................................................................................................15 Neuronal Nitric Oxide Synthase Isoforms in the Kidney................................................16 Regulation of Neuronal Nitric Oxide Synthase Expression............................................17 Oxidative Stress and Asymmetric Dimethylarginine .............................................................18 Role of Oxidative Stress in Chronic Kidney Disease......................................................18 Role of Asymmetric Dimethylarginine in Chronic Kidney Disease...............................18 Objective.................................................................................................................................20 2 GENERAL METHODS .........................................................................................................25 Animal Models .......................................................................................................................25 Ablation/infarction Model...............................................................................................25 5/6 Nephrectomy Model..................................................................................................25 Renal Transplantation Model ..........................................................................................25 Tissue Harvest .................................................................................................................26 Biochemical Analysis .............................................................................................................26 Nitric Oxide Assay ..........................................................................................................26 Nitric Oxide Synthase Activity .......................................................................................27 Pathology.........................................................................................................................27 Western Blot....................................................................................................................28 Electronic Spin Resonance..............................................................................................29 Reverse Transcription Polymerase Chain Reaction ........................................................29 5 3 IDENTIFICATION OF NEURONAL NITRIC OXIDE SYNTHASE ISOFORMS IN THE KIDNEY ........................................................................................................................31 Introduction.............................................................................................................................31 Materials and Methods ...........................................................................................................31 Results.....................................................................................................................................34 Discussion...............................................................................................................................36 4 RENAL CORTEX NEURONAL NITRIC OXIDE SYNTHASE IN KIDNEY TRANSPLANTS ....................................................................................................................44 Introduction.............................................................................................................................44 Materials and Methods ...........................................................................................................45 Results.....................................................................................................................................47 Discussion...............................................................................................................................49 5 DETERMINATION OF DIMETHYLARGININE DIMETHYLAMINOHYDROLASE ACTIVITY IN THE KIDNEY ...............................................................................................61 Introduction.............................................................................................................................61 Materials and Methods ...........................................................................................................61 Optimization of Homogenization Buffers .......................................................................62 Optimization of Deproteinization....................................................................................63 Tests for Other Pathways That Could Alter Citrulline Concentration ............................63 Comparison of Citrulline Assay and Asymmetric Dimethylarginine Degradation by High Performance Liquid Chromatography ................................................................64 Statistical Analysis ..........................................................................................................65 Results.....................................................................................................................................65 Optimization of Citrulline Assay.....................................................................................65 Effect of Urea on Citrulline Assay ..................................................................................65 Comparison of Dimethylarginine Dimethylaminohydrolase Activity Measured by Citrulline Accumulation with Asymmetric Dimethylarginine Consumption..............66 Tests for Other Pathways That Could Alter Citrulline Concentration ............................66 Discussion...............................................................................................................................66 6 VITAMIN E REDUCES GLOMERULOCLEROSIS, RESTORES RENAL NEURONAL NITRIC OXIDE SYNTHASE, AND SUPPRESSES OXIDATIVE STRESS IN THE 5/6 NEPHRECTOMIZED RAT................................................................78 Introduction.............................................................................................................................78 Materials and Methods ...........................................................................................................79 Results.....................................................................................................................................80 Discussion...............................................................................................................................82