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The main focus of this book is on brown adipose tissue and its metabolic function. The book provides a timely update on the latest research and shows where the field is heading. Brown adipose tissue (BAT) dissipates energy and has received considerable attention in the last few years, having been re-discovered in adult humans in 2007/9. Moreover, BAT might offer a target for novel therapies to address obesity, a health condition that has reached pandemic dimensions.
The world is faced with an epidemic of metabolic diseases such as obesity and type 2 diabetes. This is due to changes in dietary habits and the decrease in physical activity. Exercise is usually part of the prescription, the first line of defense, to prevent or treat metabolic disorders. However, we are still learning how and why exercise provides metabolic benefits in human health. This open access volume focuses on the cellular and molecular pathways that link exercise, muscle biology, hormones and metabolism. This will include novel “myokines” that might act as new therapeutic agents in the future.
Brown adipose tissue (BAT) has long been recognized as a key thermogenic tissue in eutherian mammals. Brown fat cells contain large numbers of highly specialized mitochondria that oxidize fat and carbohydrate to produce heat. This metabolic inefficiency is due to the presence of Ucp1 in the inner mitochondrial membrane of brown fat cells which dissociates the electrochemical gradient from ATP production. BAT presumably evolved to protect animals against hypothermia in response to cold exposure. However, energy expended by BAT has the added benefit of counteracting obesity and associated metabolic disease, at least in rodents. A very large number of studies have consistently shown that mice carrying increased amounts of active brown fat are lean and healthy. Until recently, it was generally believed that the amount of brown fat tissue was negligible in healthy adult humans. However, PET imaging studies have refuted this notion, and revealed the existence of active BAT in most, if not all, adult humans. Notably, there is a very strong inverse correlation between the amount of activated BAT and fatness in humans. Moreover, activated brown fat is lost with ageing, which also correlates with tendency to gain weight. The field must now address whether variation in brown fat activity is a cause or consequence of weight gain. Brown fat cells are localized in discrete depots of BAT and are also found as clusters interspersed in white fat tissues. The prevalence and function of these so-called “brite” (brown in white) cells in humans remains unknown. The development of strategies to increase the amount and/or activity of brown fat may hold exciting prospects for the treatment of obesity and its associated health consequences. In this Research Topics issue, we would propose to examine the following areas related to brown fat biology: 1. Development of brown and “brite” cells (including: historical/evolutionary perspective, transcriptional pathways, developmental origins) 2. Pathways that influence brown fat cell development (BMP7, TZDs, Prostaglandins, FGF21) 3. Activation of brown fat - focus on sympathetic and sensory innervation (signaling by beta-adrenergic receptors, nerve-fat connections 4. Brown fat thermogenesis in response to cold, diet and hibernation 5. Brown fat in humans including: human brown fat precursors, methods for imaging, factors that influence prevalence, relationship between body mass/obesity and amount of brown fat. 6. Brown fat mitochondria including mechanism of uncoupling (Ucp1 history/structure/function, mitochondrial biogenesis.
Today we know that white and brown adipocytes share many metabolic and molecular pathways, although their physiological function, i.e., energy storage and energy dissipation, respectively, are quite opposite for WAT (white adipose tissue) and BAT (brown adipose tissue). The authors in this book provide a comprehensive volume covering the whole rang
The book is intended to provide in-depth reviews of the recent advances in major areas of metabolism in growing domestic animals. The study of metabolism represents a nexus of biological phenomenon that integrates the impact of nutrition, physiology, endocrinology, immunology, biochemistry, and cell biology in an organism. The development of new methodological techniques and experimental approaches have provide scientists with a greater understanding of how key nutrients or substrates are metabolized at the cellular, organ, and whole animal level. This book presents contributions from leading scientists in nutrition and physiology that highlight important new developments in interorgan and tissue-specific metabolism of protein and amino acids, lipids and fatty acids, and carbohydrates in monogastric and runinant species. Authors will describe the impact of specific biochemical pathways and expression of critical enzymes, routes of nutrient or substrate input, and anatomical or structural influences on the rates of metabolism in a given tissue or cell type. Major substrates/ fuels for oxidative metabolism, key signaling pathways, and intracellular molecules that regulate the major metabolic processes will be described. Also included is how the metabolism of growing animals is influenced by ontogeny, stage of differentiation, and major changes in diet, or the environment. The concepts and specific findings in each area are discussed in the context of their impact on the nutrient requirements, growth, environmental impact, healt and well-being of animals. The book will be a useful reference for research scientists, teachers and students interested in and advanced understanding of metabolism in growing animals. The book is written by leading experts and highlights some of the most recent advances in the field of metabolism. It is a useful reference for researchers and advanced level graduate students in nutrition, physiology and animal science. Presents recent advances in the field of metabolism.
This book brings a comprehensive treatise about obesity, examining the measures that can be taken to stop and even reduce obesity if these right measures are taken in time. Recent studies show that obesity is on the increase at an alarming rate, especially in the industrialized and affluent countries. A number of reasons have been put forward for this increase, including life style choices, over-eating, over-use of commercially processed food, addiction for fast food, high caloric diet specially containing high levels of sugar and fat, lack of exercise and sedentary life style. Also genetic make up has been associated with obesity. Obesity can lead to a variety of lethal diseases, notably coronary heart disease, cancer and diabetes. These diseases account for the highest number of human death amongst all other causes. There are also a number of other side effects associated with obesity including increased stress, loss of intelligentsia, pancreatitis, premature birth and osteoarthritis. In recent years media have been playing important roles in highlighting the lethality and damage caused by obesity, nevertheless no significant effects can be seen in the population and obesity remains on the increase, especially amongst children. The editors believe that it is important that more education, campaign and research are used to stop this increasing disease.
This book has been designed to help medical students succeed with their histology classes, while using less time on studying the curriculum. The book can both be used on its own or as a supplement to the classical full-curriculum textbooks normally used by the students for their histology classes. Covering the same curriculum as the classical textbooks, from basic tissue histology to the histology of specific organs, this book is formatted and organized in a much simpler and intuitive way. Almost all text is formatted in bullets or put into structured tables. This makes it quick and easy to digest, helping the student get a good overview of the curriculum. It is easy to locate specific information in the text, such as the size of cellular structures etc. Additionally, each chapter includes simplified illustrations of various histological features. The aim of the book is to be used to quickly brush up on the curriculum, e.g. before a class or an exam. Additionally, the book includes guides to distinguish between the different histological tissues and organs that can be presented to students microscopically, e.g. during a histology spot test. This guide lists the specific characteristics of the different histological specimens and also describes how to distinguish a specimen from other similar specimens. For each histological specimen, a simplified drawing and a photomicrograph of the specimen, is presented to help the student recognize the important characteristics in the microscope. Lastly, the book contains multiple “memo boxes” in which parts of the curriculum are presented as easy-to-remember mnemonics.