Download or read book Glycolysis at 75 Is it Time to Tweak the First Elucidated Metabolic Pathway in History written by Avital Schurr and published by Frontiers Media SA. This book was released on 2015-07-08 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Glycolysis, the pathway of enzymatic reactions responsible for the breakdown of glucose into two trioses and further into pyruvate or lactate, was elucidated in 1940. For more than seven decades, it has been taught precisely the way its sequence was proposed by Embden, Meyerhof and Parnas. Accordingly, two outcomes of this pathway were proposed, an aerobic glycolysis, with pyruvate as its final product, and an anaerobic glycolysis, identical to the aerobic one, except for an additional reaction, where pyruvate is reduced to lactate. Several studies in the 1980s have shown that both muscle and brain tissues can oxidize and utilize lactate as an energy substrate, challenging this monocarboxylate’s reputation as a useless end-product of anaerobic glycolysis. These findings were met with great skepticism about the idea that lactate could be playing a role in bioenergetics. In the past quarter of a century monocarboxylate transporters (MCTs) were identified and localized in both cellular and mitochondrial membranes. A lactate receptor has been identified. Direct and indirect evidence now indicate that the enzyme lactate dehydrogenase (LDH) resides not only in the cytosol, as part of the glycolytic pathway machinery, but also in the mitochondrial outer membrane. The mitochondrial form of the enzyme oxidizes lactate to pyruvate and concomitantly produces the reducing agent NADH. These findings have shed light on a major drawback of the originally proposed aerobic version of the glycolytic pathway i.e., its inability to regenerate NAD+, as opposed to anaerobic glycolysis that features the cyclical ability of regenerating NAD+ upon pyruvate reduction to lactate by the cytosolic form of LDH. The malate-aspartate shuttle (MAS), a major redox shuttle in the brain, was proposed as an alternative pathway for NAD+ generation for aerobic glycolysis. Nonetheless, would MAS really be necessary for that function if glycolysis always proceeds to the end-products, lactate and NAD+? An additional dilemma the originally proposed aerobic glycolysis presents has to do with the glycolytic pathway of erythrocytes, which despite its highly aerobic environment, always produces lactate as its end-product. It is time to reexamine the original, dogmatic separation of glycolysis into two distinct pathways and put to test the hypothesis of a unified, singular pathway, the end-product of which is lactate, the real substrate of the mitochondrial TCA cycle.
Download or read book Glycolysis at 75 written by Avital Schurr and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Carbohydrate written by Mahmut Caliskan and published by BoD – Books on Demand. This book was released on 2017-04-12 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbohydrates are the most abound macromolecules on earth, and they serve different functions within the cell. The purpose of the book is to provide a glimpse into various aspects of carbohydrates by presenting the research of some of the scientists who are engaged in the development of new tools and ideas used to reveal carbohydrate metabolism in health and diseases and as material to mimic the carbohydrate surfaces that take part in molecular recognition, often from very different perspectives. This book covers broad topics in carbohydrate including quality carbohydrates on the prevention and therapy of noncommunicable diseases, lactate, and glycolysis, as biomass in biofuel production, targets for cancer treatment and as biomaterial.
Download or read book Cellular Metabolism and Related Disorders written by Jesmine Khan and published by BoD – Books on Demand. This book was released on 2020-07-15 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with a vital topic: metabolism in the cells of the body and various disorders due to its imbalance and/or diseases that disrupt the metabolism of the body. The objective of this book was to collect and compile up-to-date information from reputed researchers in their respective fields to disseminate the latest information about topics that have profound effects on the metabolic processes in the body including insulin resistance, diabetes mellitus, hypothyroidism, metabolic syndrome, glycogen storage disease, and the urea cycle disorder. In total, there are 12 chapters in this book in which the authors have shared their research findings and real-life experiences in managing their patients.
Download or read book The Heterogeneity of Cancer Metabolism written by Anne Le and published by Springer. This book was released on 2018-06-26 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Genetic alterations in cancer, in addition to being the fundamental drivers of tumorigenesis, can give rise to a variety of metabolic adaptations that allow cancer cells to survive and proliferate in diverse tumor microenvironments. This metabolic flexibility is different from normal cellular metabolic processes and leads to heterogeneity in cancer metabolism within the same cancer type or even within the same tumor. In this book, we delve into the complexity and diversity of cancer metabolism, and highlight how understanding the heterogeneity of cancer metabolism is fundamental to the development of effective metabolism-based therapeutic strategies. Deciphering how cancer cells utilize various nutrient resources will enable clinicians and researchers to pair specific chemotherapeutic agents with patients who are most likely to respond with positive outcomes, allowing for more cost-effective and personalized cancer therapeutic strategies.
Download or read book Mitochondria and Anaerobic Energy Metabolism in Eukaryotes written by William F. Martin and published by Walter de Gruyter GmbH & Co KG. This book was released on 2020-12-07 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mitochondria are sometimes called the powerhouses of eukaryotic cells, because mitochondria are the site of ATP synthesis in the cell. ATP is the universal energy currency, it provides the power that runs all other life processes. Humans need oxygen to survive because of ATP synthesis in mitochondria. The sugars from our diet are converted to carbon dioxide in mitochondria in a process that requires oxygen. Just like a fire needs oxygen to burn, our mitochondria need oxygen to make ATP. From textbooks and popular literature one can easily get the impression that all mitochondria require oxygen. But that is not the case. There are many groups of organismsm known that make ATP in mitochondria without the help of oxygen. They have preserved biochemical relicts from the early evolution of eukaryotic cells, which took place during times in Earth history when there was hardly any oxygen avaiable, certainly not enough to breathe. How the anaerobic forms of mitochondria work, in which organisms they occur, and how the eukaryotic anaerobes that possess them fit into the larger picture of rising atmospheric oxygen during Earth history are the topic of this book.
Download or read book Basic Exercise Physiology written by Moran S. Saghiv and published by Springer Nature. This book was released on 2020-08-26 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the assessment of human performance and the role of different exercise modes both in a laboratory and clinical setting. Details of how to successfully perform basic laboratory procedures for exercise training in health and disease, as well as how to apply non-invasive measurements in exercise physiology are provided. Chapters cover how to appropriately use a range of measures in assessing pulmonary function, anaerobic function and oxygen uptake. Techniques for cardiopulmonary rehabilitation and the mechanisms associated with thermoregulation are also described. Interactive exercises enable readers to easily assimilate key concepts and develop a thorough understanding of the topic. Basic Exercise Physiology provides both trainees and professional healthcare staff interested in exercise physiology with a detailed and practically applicable resource on the topic.
Download or read book Understanding the Control of Metabolism written by David Fell and published by . This book was released on 1997 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bacterial Physiology and Metabolism written by Byung Hong Kim and published by Cambridge University Press. This book was released on 2008-02-21 with total page 934 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent determination of genome sequences for a wide range of bacteria has made in-depth knowledge of prokaryotic metabolic function essential in order to give biochemical, physiological, and ecological meaning to the genomic information. Clearly describing the important metabolic processes that occur in prokaryotes under different conditions and in different environments, this advanced text provides an overview of the key cellular processes that determine bacterial roles in the environment, biotechnology, and human health. Prokaryotic structure is described as well as the means by which nutrients are transported into cells across membranes. Glucose metabolism through glycolysis and the TCA cycle are discussed, as well as other trophic variations found in prokaryotes, including the use of organic compounds, anaerobic fermentation, anaerobic respiratory processes, and photosynthesis. The regulation of metabolism through control of gene expression and control of the activity of enzymes is also covered, as well as survival mechanisms used under starvation conditions.
Download or read book Manual of Embryo Culture in Human Assisted Reproduction written by Kersti Lundin and published by Cambridge University Press. This book was released on 2021-05-06 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: Whilst assisted reproduction techniques (ART) have become increasingly successful and largely standardized, there is still only a partial understanding of what constitutes a 'true' embryo environment. Replicating the varying physiological conditions of the in-vivo environment that the embryo travels through in the in-vitro culture is still a major challenge in ART. This practical volume details how to organize and operate an IVF laboratory in order to mimic these conditions for successful embryo culture. Environments and equipment that are essential for running safe and efficient facilities such as maintaining good air quality and hygiene protocols, and utilizing an effective layout are covered in detail. Other chapters discuss the different consumables needed, optimal handling techniques and parameter monitoring systems, as well as recent advances in the area including artificial intelligence and automation. This is an indispensable guide to understanding the background science of culturing embryos, crucial to successful outcomes in ART.
Download or read book Mechanisms of Insulin Action written by Alan R. Saltiel and published by Springer Science & Business Media. This book was released on 2007-10-05 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: More than 18 million people in the United States have diabetes mellitus, and about 90% of these have the type 2 form of the disease. This book attempts to dissect the complexity of the molecular mechanisms of insulin action with a special emphasis on those features of the system that are subject to alteration in type 2 diabetes and other insulin resistant states. It explores insulin action at the most basic levels, through complex systems.
Download or read book Innate Immunity and Inflammation written by Ruslan Medzhitov and published by Cold Spring Harbor Perspective. This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A subject collection from Cold Spring Harbor perspectives in biology."
Download or read book Astrocytic neuronal astrocytic Pathway Selection for Formation and Degradation of Glutamate GABA written by Leif Hertz and published by Frontiers E-books. This book was released on 2014-04-30 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: Endocrinological research early recognized the importance of intercellular interactions and realized the importance of glutamatergic and GABAergic signaling. In turn this signalling depends on elaborate interactions between astrocytes and neurons, without which neurons would be unable to produce, reuse and metabolize transmitter glutamate and GABA. Details of these subjects are described in this Research Topic by key investigators in this field. It focuses on the intricate and extremely swift pathway producing these amino acid transmitters from glucose in brain but also discusses difficulties in determining expression of some of the necessary genes in astrocytes and related processes in pancreatic islets. However, it does not discuss how closely associated astrocytes and neurons are anatomically, enabling these interactions. This is elegantly shown in this cover image, kindly provided by Professor Andreas Reichenbach (University of Leipzig, Germany).
Download or read book The Pentose Phosphate Pathway written by Terry Wood and published by Elsevier. This book was released on 2012-12-02 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Pentose Phosphate Pathway aims to explore the pentose phosphate cycle and the practical techniques applied in its investigation. The main focus of the book is the pentose phosphate cycle in animals as well as microorganisms, and does not discuss the one related to photosynthesis. The book covers the formulation of the pathway, its types, and its alternative formulations; the preparation, processes, and analysis of the pathway; and the enzymes involved. Also covered in the book are the intermediates in intact cells and tissues; distribution of enzymes among different tissues and species; the operation, regulation, and overall control of the pathway; and the clinical, nutritional, and metabolic aspects of the pathway. The text is recommended for biologists and biochemists who would like to understand further the pentose phosphate pathway and the processes related to it.
Download or read book Cancer as a Metabolic Disease written by Thomas Seyfried and published by John Wiley & Sons. This book was released on 2012-05-18 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book addresses controversies related to the origins of cancer and provides solutions to cancer management and prevention. It expands upon Otto Warburg's well-known theory that all cancer is a disease of energy metabolism. However, Warburg did not link his theory to the "hallmarks of cancer" and thus his theory was discredited. This book aims to provide evidence, through case studies, that cancer is primarily a metabolic disease requring metabolic solutions for its management and prevention. Support for this position is derived from critical assessment of current cancer theories. Brain cancer case studies are presented as a proof of principle for metabolic solutions to disease management, but similarities are drawn to other types of cancer, including breast and colon, due to the same cellular mutations that they demonstrate.
Download or read book Principles of Exercise Biochemistry written by J. R. Poortmans and published by Karger Medical and Scientific Publishers. This book was released on 2004 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique volume provides a comprehensive review of the biochemistry of exercise. Written by internationally renowned experts, the publication has been completely revised and updated. The present edition follows the new concepts of applied biochemistry which have emerged recently in the scientific literature. Genomics, proteomics, and metabolomics are nowadays common terms used to the elucidation of gene function, expression of proteins and comprehensive analysis of all the metabolites in a tissue. The major steps of biochemistry are considered in active survey in this new 3rd edition of an already acclaimed publication. The book is a valuable source for all exercise biochemists and physiologists, sports physicians, graduate students in physical education and physical therapy, and postgraduate research fellows.
Download or read book Enzymatic Reaction Mechanisms written by Perry A. Frey and published by Oxford University Press. This book was released on 2007-01-27 with total page 848 pages. Available in PDF, EPUB and Kindle. Book excerpt: Books dealing with the mechanisms of enzymatic reactions were written a generation ago. They included volumes entitled Bioorganic Mechanisms, I and II by T.C. Bruice and S.J. Benkovic, published in 1965, the volume entitled Catalysis in Chemistry and Enzymology by W.P. Jencks in 1969, and the volume entitled Enzymatic Reaction Mechanisms by C.T. Walsh in 1979. The Walsh book was based on the course taught by W.P. Jencks and R.H. Abeles at Brandeis University in the 1960's and 1970's. By the late 1970's, much more could be included about the structures of enzymes and the kinetics and mechanisms of enzymatic reactions themselves, and less emphasis was placed on chemical models. Walshs book was widely used in courses on enzymatic mechanisms for many years. Much has happened in the field of mechanistic enzymology in the past 15 to 20 years. Walshs book is both out-of-date and out-of-focus in todays world of enzymatic mechanisms. There is no longer a single volume or a small collection of volumes to which students can be directed to obtain a clear understanding of the state of knowledge regarding the chemicals mechanisms by which enzymes catalyze biological reactions. There is no single volume to which medicinal chemists and biotechnologists can refer on the subject of enzymatic mechanisms. Practitioners in the field have recognized a need for a new book on enzymatic mechanisms for more than ten years, and several, including Walsh, have considered undertaking to modernize Walshs book. However, these good intentions have been abandoned for one reason or another. The great size of the knowledge base in mechanistic enzymology has been a deterrent. It seems too large a subject for a single author, and it is difficult for several authors to coordinate their work to mutual satisfaction. This text by Perry A. Frey and Adrian D. Hegeman accomplishes this feat, producing the long-awaited replacement for Walshs classic text.
