Download or read book Generation of Neurons and Their Integration in Pre Existing Circuits in the Postnatal Brain Signalling in Physiological and Regenerative Contexts written by Helena Mira and published by Frontiers Media SA. This book was released on 2020-09-03 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.
Download or read book Postnatal And Adult Neurogenesis written by Luca Bonfanti and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fact that the mammalian central nervous system is mostly made up of perennial elements accounting for its well known uncapability to undergo physiological cell renewal and post-lesion repair has represented a dogma for most of the XXth century. Yet, research carried out starting from the sixties in a rather sceptic milieu, and exponentially expanded at the beginning of the nineties with the definitive demonstration that neurogenesis actually takes place in the adult brain and that it is sustained by neural stem cells, opened a new, challenging field in neuroscience. In the last fifteen years, such a field has been tackled by interdisciplinary approaches thus spreading into several ramifications, often referred either more generally to as developmental neurobiology and structural plasticity , or more specifically to as adult neurogenesis . The aims of these studies have become more focused in a wide range of topics, spanning from the detailed morphological/molecular analysis of neurogenic sites to the migration/specification/integration of newlyborn cell precursors into neuronal circuits; from the in vivo identification of cell types and their functional relationships within the neural stem cell niches to the in vitro isolation and characterization of neural stem cells in the perspective of brain repair. In the last few years, in spite of a huge amount of information gathered around the issue of neurogenesis, new elements of complexity have arisen, thus leaving open many questions. It is now clear that persistent neurogenesis do not faithfully reproduce embryonic developmental processes. Indeed, postnatal changes involving the structure/function of neurogenic sites and the neural stem cell niches contained herein, do occur in order to adapt to the mature nervous tissue. The recent finding that adult neural stem cells share a glial identity and directly derive from radial glia raises questions concerning the neuronal-glial relationships across pre- and post-natal development. The progeny of neuronal precursors must integrate into already established neural circuits, whose features change according to the pre- and post-natal developmental stages. In addition, the fact that neural stem cells isolated in vitro prevalently differentiate into astrocytes, whereas in vivo they produce mainly neurons, highlights the importance of epigenetic signals. Finally, substantial data recently obtained under a comparative profile reveal that persistent neurogenesis, although being a well preserved trait, shows remarkable differences among species and, possibly, interesting evolutionary adaptations. The comparative approach, both among mammals and among vertebrates, further reveals new elements of complexity linked to the different growth rates and lifespans. Yet, although introducing new questions about postnatal and adult stages in different species, this approach could provide insights as concerns the functional significance of persistent neurogenesis. Thus, 50 years after the first evidence that new neurons can be generated and added to a mature brain, the actual meaning of such a phenomenon in brain physiology as well as its usefulness in brain repair remain a matter of debate. We learned that neurogenesis can persist in restricted brain sites, whereby it undergoes complex cell/molecular regulation, whereas in the rest of the nervous system it remains as a potentiality. Hence, a better knowledge of the complex regulatory mechanisms underlying these processes should be attained to understand if and how endogenous neurogenesis can be exploited/modulated in the perspective of brain healing. This book, other than providing an overview of the state of the art in the field of postnatal and adult neurogenesis, tries to update our present knowledge about the postnatal changes of neurogenic processes and to place them in the context of a comparative vision. The attainment of this goal has been possible thanks to the contribution of many young scientists from different corners of the world, who have built their experience in neurogenesis during the last decade.
Download or read book Activity dependent Integration and Plasticity of New Neurons During Postnatal Neurogenesis written by Chia-Wei Lin and published by . This book was released on 2010 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most neurons are born during the embryonic period to become the building blocks for a variety of brain circuits. However, two brain regions only start to assemble during the postnatal period. Both brain areas, olfactory bulb and dentate gyrus, mainly accommodate the integration of new neurons during the postnatal period, and continuously receive new neurons throughout animals' life. In this thesis, I used the rat olfactory bulb (OB) as a model system to address two important issues regarding the integration and plasticity of new neurons generated during the postnatal period. The first feature of postnatal neurogenesis is that when new neurons arrive and integrate into an adult OB, only half of neurons can ultimately survive. However, what form of activity pattern determines the survival of new neurons remains unclear. Using NaChBac sodium channels to selectively alter the intrinsic excitability of new neurons in vivo, this manipulation reveals that neuronal survival critically depends on the level of membrane depolarization. Once neurons integrate and survive in the brain circuits, neurons have the capability of monitoring their activity level and adaptively maintain their membrane excitability within the operational range. How they achieve the long-term stability of membrane excitability remains unclear. By altering the resting membrane potential of individual neurons in vivo, OB granule neurons are found to use a subthreshold parameter, resting membrane potential, to guide the compensatory changes of intrinsic ion channels and synaptic receptors. In summary, studies from this thesis have revealed the cellular mechanisms underlying neuronal survival in an in vivo brain circuit. I also uncover a novel form of homeostatic computation by which granule neurons preferentially use the subthreshold membrane potential response rather than spiking rates as a set point.
Download or read book Adult Neurogenesis in the Hippocampus written by Juan J. Canales and published by Academic Press. This book was released on 2016-03-23 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neurogenesis in the adult brain has emerged as one of the most dynamic and rapidly moving fields in modern neuroscience research. The implications of adult neurogenesis for health and well-being are wide-ranging, with findings in this area having distinct relevance for treatment and rehabilitation in neurology and psychopathology. Adult Neurogenesis in the Hippocampus addresses these implications by providing an up-to-date account on how neurogenesis in the adult hippocampus contributes to critical psychological and physiological processes, such as learning and memory, and how it is modified by life experiences, such as aging, environmental enrichment, exercise, and dieting. The book also provides the most current reviews of how adult hippocampal neurogenesis influences the pathogenesis of mood disorders, addiction, and key neurological disorders. This book is the ideal resource for researchers and advanced graduates seeking focused knowledge on the role of adult neurogenesis in brain health and disease. Provides a unique overview of how adult hippocampal neurogenesis contributes to adaptive processes, brain psychopathology, and disease Includes state-of-the-art reviews by leading world experts in adult neurogenesis
Download or read book Enteric Glia written by Brian D. Gulbransen and published by Biota Publishing. This book was released on 2014-07-01 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: The enteric nervous system (ENS) is a complex neural network embedded in the gut wall that orchestrates the reflex behaviors of the intestine. The ENS is often referred to as the “little brain” in the gut because the ENS is more similar in size, complexity and autonomy to the central nervous system (CNS) than other components of the autonomic nervous system. Like the brain, the ENS is composed of neurons that are surrounded by glial cells. Enteric glia are a unique type of peripheral glia that are similar to astrocytes of the CNS. Yet enteric glial cells also differ from astrocytes in many important ways. The roles of enteric glial cell populations in the gut are beginning to come to light and recent evidence implicates enteric glia in almost every aspect of gastrointestinal physiology and pathophysiology. However, elucidating the exact mechanisms by which enteric glia influence gastrointestinal physiology and identifying how those roles are altered during gastrointestinal pathophysiology remain areas of intense research. The purpose of this e-book is to provide an introduction to enteric glial cells and to act as a resource for ongoing studies on this fascinating population of glia. Table of Contents: Introduction / A Historical Perspective on Enteric Glia / Enteric Glia: The Astroglia of the Gut / Molecular Composition of Enteric Glia / Development of Enteric Glia / Functional Roles of Enteric Glia / Enteric Glia and Disease Processes in the Gut / Concluding Remarks / References / Author Biography
Download or read book Translational Research in Traumatic Brain Injury written by Daniel Laskowitz and published by CRC Press. This book was released on 2016-04-21 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Traumatic brain injury (TBI) remains a significant source of death and permanent disability, contributing to nearly one-third of all injury related deaths in the United States and exacting a profound personal and economic toll. Despite the increased resources that have recently been brought to bear to improve our understanding of TBI, the developme
Download or read book The Neurobiology of Olfaction written by Anna Menini and published by CRC Press. This book was released on 2009-11-24 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive Overview of Advances in OlfactionThe common belief is that human smell perception is much reduced compared with other mammals, so that whatever abilities are uncovered and investigated in animal research would have little significance for humans. However, new evidence from a variety of sources indicates this traditional view is likely
Download or read book Neurogenesis and Neural Plasticity written by Catherine Belzung and published by Springer Science & Business Media. This book was released on 2014-07-08 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume brings together authors working on a wide range of topics to provide an up to date account of the underlying mechanisms and functions of neurogenesis and synaptogenesis in the adult brain. With an increasing understanding of the role of neurogenesis and synaptogenesis it is possible to envisage improvements or novel treatments for a number of diseases and the possibility of harnessing these phenomena to reduce the impact of ageing and to provide mechanisms to repair the brain.
Download or read book Rhythms of the Brain written by G. Buzsáki and published by Oxford University Press. This book was released on 2011 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies of mechanisms in the brain that allow complicated things to happen in a coordinated fashion have produced some of the most spectacular discoveries in neuroscience. This book provides eloquent support for the idea that spontaneous neuron activity, far from being mere noise, is actually the source of our cognitive abilities. It takes a fresh look at the coevolution of structure and function in the mammalian brain, illustrating how self-emerged oscillatory timing is the brain's fundamental organizer of neuronal information. The small-world-like connectivity of the cerebral cortex allows for global computation on multiple spatial and temporal scales. The perpetual interactions among the multiple network oscillators keep cortical systems in a highly sensitive "metastable" state and provide energy-efficient synchronizing mechanisms via weak links. In a sequence of "cycles," György Buzsáki guides the reader from the physics of oscillations through neuronal assembly organization to complex cognitive processing and memory storage. His clear, fluid writing-accessible to any reader with some scientific knowledge-is supplemented by extensive footnotes and references that make it just as gratifying and instructive a read for the specialist. The coherent view of a single author who has been at the forefront of research in this exciting field, this volume is essential reading for anyone interested in our rapidly evolving understanding of the brain.
Download or read book The Synaptic Organization of the Brain written by Gordon M. Shepherd and published by Oxford University Press. This book was released on 2004 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a thorough revision of the standard text on local circuits in the different regions of the brain. In this fifth edition, the results of the mouse and human genome projects are incorporated for the first time. Also for the first time, the reader is oriented to supporting neuroscience databases. Among the new advances covered are 2-photon confocal laser microscopy of dendrites and dendritic spines, biochemical analyses, and dual patch and multielectrode recordings, applied together with an increasing range of behavioral and gene-targeting methods.
Download or read book Guidelines for the Care and Use of Mammals in Neuroscience and Behavioral Research written by National Research Council and published by National Academies Press. This book was released on 2003-08-22 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: Expanding on the National Research Council's Guide for the Care and Use of Laboratory Animals, this book deals specifically with mammals in neuroscience and behavioral research laboratories. It offers flexible guidelines for the care of these animals, and guidance on adapting these guidelines to various situations without hindering the research process. Guidelines for the Care and Use of Mammals in Neuroscience and Behavioral Research offers a more in-depth treatment of concerns specific to these disciplines than any previous guide on animal care and use. It treats on such important subjects as: The important role that the researcher and veterinarian play in developing animal protocols. Methods for assessing and ensuring an animal's well-being. General animal-care elements as they apply to neuroscience and behavioral research, and common animal welfare challenges this research can pose. The use of professional judgment and careful interpretation of regulations and guidelines to develop performance standards ensuring animal well-being and high-quality research. Guidelines for the Care and Use of Mammals in Neuroscience and Behavioral Research treats the development and evaluation of animal-use protocols as a decision-making process, not just a decision. To this end, it presents the most current, in-depth information about the best practices for animal care and use, as they pertain to the intricacies of neuroscience and behavioral research.
Download or read book Glial Neuronal Signaling written by Glenn I. Hatton and published by Springer Science & Business Media. This book was released on 2004-05-31 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Glial Neuronal Signaling fills a need for a monograph/textbook to be used in advanced courses or graduate seminars aimed at exploring glial-neuronal interactions. Even experts in the field will find useful the authoritative summaries of evidence on ion channels and transporters in glia, genes involved in signaling during development, metabolic cross talk and cooperation between astrocytes and neurons, to mention but a few of the timely summaries of a wide range of glial-neuronal interactions. The chapters are written by the top researchers in the field of glial-neuronal signaling, and cover the most current advances in this field. The book will also be of value to the workers in the field of cell biology in general. When we think about the brain we usually think about neurons. Although there are 100 billion neurons in mammalian brain, these cells do not constitute a majority. Quite the contrary, glial cells and other non-neuronal cells are 10-50 times more numerous than neurons. This book is meant to integrate the emerging body of information that has been accumulating, revealing the interactive nature of the brain's two major neural cell types, neurons and glia, in brain function.
Download or read book Brain Repair After Stroke written by Steven C. Cramer and published by Cambridge University Press. This book was released on 2010-10-28 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: Increasing evidence identifies the possibility of restoring function to the damaged brain via exogenous therapies. One major target for these advances is stroke, where most patients can be left with significant disability. Treatments have the potential to improve the victim's quality of life significantly and reduce the time and expense of rehabilitation. Brain Repair After Stroke reviews the biology of spontaneous brain repair after stroke in animal models and in humans. Detailed chapters cover the many forms of therapy being explored to promote brain repair and consider clinical trial issues in this context. This book provides a summary of the neurobiology of innate and treatment-induced repair mechanisms after hypoxia and reviews the state of the art for human therapeutics in relation to promoting behavioral recovery after stroke. Essential reading for stroke physicians, neurologists, rehabilitation physicians and neuropsychologists.
Download or read book Astrocytes in Patho Physiology of the Nervous System written by Vladimir Parpura and published by Springer Science & Business Media. This book was released on 2008-12-11 with total page 701 pages. Available in PDF, EPUB and Kindle. Book excerpt: Astrocytes were the original neuroglia that Ramón y Cajal visualized in 1913 using a gold sublimate stain. This stain targeted intermediate filaments that we now know consist mainly of glial fibrillary acidic protein, a protein used today as an astrocytic marker. Cajal described the morphological diversity of these cells with some ast- cytes surrounding neurons, while the others are intimately associated with vasculature. We start the book by discussing the heterogeneity of astrocytes using contemporary tools and by calling into question the assumption by classical neuroscience that neurons and glia are derived from distinct pools of progenitor cells. Astrocytes have long been neglected as active participants in intercellular communication and information processing in the central nervous system, in part due to their lack of electrical excitability. The follow up chapters review the “nuts and bolts” of ast- cytic physiology; astrocytes possess a diverse assortment of ion channels, neu- transmitter receptors, and transport mechanisms that enable the astrocytes to respond to many of the same signals that act on neurons. Since astrocytes can detect chemical transmitters that are released from neurons and can release their own extracellular signals there is an increasing awareness that they play physiological roles in regulating neuronal activity and synaptic transmission. In addition to these physiological roles, it is becoming increasingly recognized that astrocytes play critical roles during pathophysiological states of the nervous system; these states include gliomas, Alexander disease, and epilepsy to mention a few.
Download or read book Neuroscience in the 21st Century written by Donald W. Pfaff and published by Springer. This book was released on 2016-10-27 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Edited and authored by a wealth of international experts in neuroscience and related disciplines, this key new resource aims to offer medical students and graduate researchers around the world a comprehensive introduction and overview of modern neuroscience. Neuroscience research is certain to prove a vital element in combating mental illness in its various incarnations, a strategic battleground in the future of medicine, as the prevalence of mental disorders is becoming better understood each year. Hundreds of millions of people worldwide are affected by mental, behavioral, neurological and substance use disorders. The World Health Organization estimated in 2002 that 154 million people globally suffer from depression and 25 million people from schizophrenia; 91 million people are affected by alcohol use disorders and 15 million by drug use disorders. A more recent WHO report shows that 50 million people suffer from epilepsy and 24 million from Alzheimer’s and other dementias. Because neuroscience takes the etiology of disease—the complex interplay between biological, psychological, and sociocultural factors—as its object of inquiry, it is increasingly valuable in understanding an array of medical conditions. A recent report by the United States’ Surgeon General cites several such diseases: schizophrenia, bipolar disorder, early-onset depression, autism, attention deficit/ hyperactivity disorder, anorexia nervosa, and panic disorder, among many others. Not only is this volume a boon to those wishing to understand the future of neuroscience, it also aims to encourage the initiation of neuroscience programs in developing countries, featuring as it does an appendix full of advice on how to develop such programs. With broad coverage of both basic science and clinical issues, comprising around 150 chapters from a diversity of international authors and including complementary video components, Neuroscience in the 21st Century in its second edition serves as a comprehensive resource to students and researchers alike.
Download or read book Genetic Programming written by John R. Koza and published by MIT Press. This book was released on 1992 with total page 856 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this ground-breaking book, John Koza shows how this remarkable paradigm works and provides substantial empirical evidence that solutions to a great variety of problems from many different fields can be found by genetically breeding populations of computer programs. Genetic programming may be more powerful than neural networks and other machine learning techniques, able to solve problems in a wider range of disciplines. In this ground-breaking book, John Koza shows how this remarkable paradigm works and provides substantial empirical evidence that solutions to a great variety of problems from many different fields can be found by genetically breeding populations of computer programs. Genetic Programming contains a great many worked examples and includes a sample computer code that will allow readers to run their own programs.In getting computers to solve problems without being explicitly programmed, Koza stresses two points: that seemingly different problems from a variety of fields can be reformulated as problems of program induction, and that the recently developed genetic programming paradigm provides a way to search the space of possible computer programs for a highly fit individual computer program to solve the problems of program induction. Good programs are found by evolving them in a computer against a fitness measure instead of by sitting down and writing them.
Download or read book The CA3 Region of the Hippocampus How is it What is it for How does it do it written by Enrico Cherubini and published by Frontiers Media SA. This book was released on 2015-08-19 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: The CA3 hippocampal region receives information from the entorhinal cortex either directly from the perforant path or indirectly from the dentate gyrus via the mossy fibers (MFs). According to their specific targets (principal/mossy cells or interneurons), MFs terminate with large boutons or small filopodial extensions, respectively. MF-CA3 synapses are characterized by a low probability of release and pronounced frequency-dependent facilitation. In addition MF terminals are endowed with mGluRs that regulate their own release. We will describe the intrinsic membrane properties of pyramidal cells, which can sometimes fire in bursts, together with the geometry of their dendritic arborization. The single layer of pyramidal cells is quite distinct from the six-layered neocortical arrangement. The resulting aligned dendrites provides the substrate for laminated excitatory inputs. They also underlie a precise, diversity of inhibitory control which we will also describe in detail. The CA3 region has an especially rich internal connectivity, with recurrent excitatory and inhibitory loops. In recent years both in vivo and in vitro studies have allowed to better understand functional properties of the CA3 auto-associative network and its role in information processing. This circuit is implicated in encoding spatial representations and episodic memories. It generates physiological population synchronies, including gamma, theta and sharp-waves that are presumed to associate firing in selected assemblies of cells in different behavioral conditions. The CA3 region is susceptible to neurodegeneration during aging and after stresses such as infection or injury. Loss of some CA3 neurones has striking effects on mossy fiber inputs and can facilitate the generation of pathologic synchrony within the CA3 micro-circuit. The aim of this special topic is to bring together experts on the cellular and molecular mechanisms regulating the wiring properties of the CA3 hippocampal microcircuit in both physiological and pathological conditions, synaptic plasticity, behavior and cognition.We will particularly emphasize the dual glutamatergic and GABAergic phenotype of MF-CA3 synapses at early developmental stages and the steps that regulate the integration of newly generated neurons into the adult dentate gyrus-CA3 circuit.
