This volume is made up of papers presented at the Second International Altschul Symposium: Biology and Pathology of Astrocyte-Neuron Interactions. The symposium was held in Saskatoon, Canada at the University of Saskatchewn in May, 1992 in memory of Rudolf Altschul, a graduate of the University of Prague and a pioneer in the fields of the biology of the vascular and nervous systems. Dr. Altschul was Professor and Head of the Department of Anatomy at the University of Saskatchewan from 1955 to 1963. The Altschul Symposia were made possible by an endowment left by Anni Altschul and by other contributions. The symposia are held biennially. One of the greatest challenges for present day scientists is to uncover the mechanisms of brain function. Although cellular anatomy of the nervous system has already been well outlined and indeed was delineated by the beginning of the century, experimental analysis of the function of the brain is relatively recent. The framework of the brain is made up of stellate cells, the astrocytes, which are interconnected by means of their processes, thus presenting a meshwork through which the neurons send their axons, accompanied by oligodendrocytes. Microglia are distributed throughout the brain.

This volume contains papers presented at the Fourth International Altschul Sympo- sium, held June 27-29, 1996, at the University of Saskatchewan in Saskatoon, Saskatche- wan, Canada. The Altschul Symposia Series are held in memory of Rudolf Altschul, a graduate of the University of Prague and a pioneer in the fields of vascular and nervous system biology. Dr. Altschul was head of the Department of Anatomy at the University of Saskatchewan from 1955 to 1963. The Altschul Symposia are made possible by an endow- ment left by Anni Altschul, Dr. Altschul's wife, and by other contributions given by the sponsors listed at the end of this Preface. The objective of the Fourth Altschul Symposium, entitled Cell Biologv and Pathol- ogv of Myelin: Evolving Biological Concepts and Therapeutic Approaches, was to facili- tate the transfer of ideas on the biology and pathology of myelin from the research laboratory to the clinic by providing a forum for discussing the evolving biological con- cepts regarding myelin function in health and disease.

The last decades have witnessed a radical change in our views on central nervous system damage and repair. This change is not only due to the emergence of new powerful tools for the analysis of the brain and its reactions to insults, but it also reflects a conceptual change in the way we approach these problems. As an illustration to this development, it is instructive to go back to the proceedings of a meeting at the NIH in 1955 edited by William F. Windle, which summarizes the disillusioned and pessimistic view on CNS regeneration prevailing at the time. While this generation of researchers were well aware of the issues at stake, they felt they had reached the end of the road; the approaches they had pursued had got stuck and the tools available could not take them any further. I can very well imagine that the participants, most of them leaders in the field, left that conference feeling they had heard their field being sentenced to death.

This volume is made up of papers presented at the Second International Altschul Symposium: Biology and Pathology of Astrocyte-Neuron Interactions. The symposium was held in Saskatoon, Canada at the University of Saskatchewn in May, 1992 in memory of Rudolf Altschul, a graduate of the University of Prague and a pioneer in the fields of the biology of the vascular and nervous systems. Dr. Altschul was Professor and Head of the Department of Anatomy at the University of Saskatchewan from 1955 to 1963. The Altschul Symposia were made possible by an endowment left by Anni Altschul and by other contributions. The symposia are held biennially. One of the greatest challenges for present day scientists is to uncover the mechanisms of brain function. Although cellular anatomy of the nervous system has already been well outlined and indeed was delineated by the beginning of the century, experimental analysis of the function of the brain is relatively recent. The framework of the brain is made up of stellate cells, the astrocytes, which are interconnected by means of their processes, thus presenting a meshwork through which the neurons send their axons, accompanied by oligodendrocytes. Microglia are distributed throughout the brain.

This book is a must read for anyone interested in Hippocrates' dictum: "Let food be your medicine and medicine your food". This book focuses on the therapeutic effects of broccoli phytochemicals, in particular certain glucosinolate metabolites and flavonoids. This book is organized in such a manner that people with only a basic background in the biological sciences would profit greatly. Anyone interested in any area of nutrigenomics would profit from reading this book as well. This would include horticulturists interested in how phytochemicals may be therapeutic, as well as nutritionists and other health professionals who wish to better understand how diet may influence gene expression and thereby health. Persons engaged in the food-processing industry will also find this book profitable. This book will be of especial interest to graduate students as well as health profession students. The book starts out with a chapter outlining the role of Professor Paul Talalay of Johns Hopkins University and his colleagues, whom initially identified activators of the Nrf2 signalling pathway as playing a critical role in the anti-cancer properties of certain phytochemicals and then went on to greatly develop this area of nutrigenomic research, most recently with human clinical trials. Since many of the therapeutic effects of broccoli consumption can be attributed to specific glucosinolates, two chapters deal with glucosinolates in general (Chapter Two) and glucosinolate distribution in different broccoli cultivars specifically (Chapter Three). Nrf2 activators will influence xenobiotic metabolism in a number of ways; hence, Chapter Four gives an overview of xenobiotic metabolism. Chronic diseases, a major target of nutraceuticals, are a major health concern and place a huge burden on the health care system. Chronic diseases are driven by oxidative stress and generalized inflammation. To understand the medicinal effects of plant bioactive compounds requires an understanding of the mechanisms of oxidant production and scavenging, how oxidative stress affects signalling pathways, and the roles of certain phytochemicals in countering oxidative stress and inflammation. This is the topic of Chapter Five. Chapter Six outlines the Nrf2 signalling pathway and its role in regaining redox and metabolic homeostasis. Broccoli also contains bioactive flavonoids that influence xenobotic metabolism and Nrf2 signalling. Chapter Seven deals with flavonoids with a focus on the major flavonoids found in broccoli, quercetin and kaempferol. Chapters Eight through Eleven outline some of the basic research examining the effects of sulforaphane on x-irradiation-mediated damage, UV-mediated skin damage and perinatal ischemic insults. Chapters Twelve and Three give an overview of some of the clinical trials that involve intake of sulforaphane/broccoli sprouts. The last four chapters deal with the agronomic aspects of broccoli, including cultivation, post-harvest processing and how various cooking methods affect the bioactive components in broccoli.

To facilitate the transfer of information from the laboratory to the clinic, 33 papers discuss the evolving biological concepts regarding myelin function in health and disease. They work within the understanding the membrane functions as more than a simple insulating sheath, and cover it as a dynami