Download or read book Rio Hortega s Third Contribution to the Morphological Knowledge and Functional Interpretation of the Oligodendroglia written by Jose R. Iglesias-Rozas and published by Newnes. This book was released on 2013-06-05 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pío del Rio-Hortega, one of the pioneering neuroscientists and discoverer of microglia, has been recognized as one of the most important Spanish neurohistogists of the past century. His landmark research on oligodendroglia, originally published in Spanish in 1928, has been translated into English for the first time by Dr. José R. Iglesias-Rozas and Prof. Manuel Garrosa. The book establishes definitively the concept of oligodendroglia and describes in great detail its structure, varieties, function, origin and pathology, providing a thorough review. The entire 1928 writing is presented, including the 79 excellent drawings and photographs from the original publication. To complement the original book and provide historical context, the translators have also included an introduction to the research and a biography of Pío del Rio-Hortega. This book constitutes a milestone in the history of neuroscience, biology and medicine, and it will be valuable reading for researchers and practitioners in these fields. First English translation of seminal 1928 research Contains the broad descriptions and interpretations of the normal and pathological oligodendroglia Full original text and new introductory sections

Download or read book The Major Discoveries of Cajal and His Disciples Consolidated Milestones for the Neuroscience of the XXIst Century written by Fernando de Castro and published by Frontiers Media SA. This book was released on 2017-04-25 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: When Santiago Ramón y Cajal started to unravel the fine structure of the nervous system in the last decades of the XIXth century maybe only his unbeatable soul of brave Spaniard imagined that most of the descriptions were scientific truths that lasted to date. Simple histological stainings, curiosity to ameliorate these, monocular microscopes, patience for drawing his observations and a rich imaginative open mind: this is the recipy for Cajal success. His descriptions of connectivity in the nervous system, compiled in Cajal's opus magna published in 1904 ("Textura del sistema nervioso del hombre y los vertebrados") and 1911 ("Histologie du systeme nerveux"), have been corroborated by modern techniques decade after decade. Even more, the main hypothesis that Cajal raised are universally recognised as biological laws, today: the neuron theory, the law on the dynamic polarization of the neuron and the chemotropic hypothesis. That is: the nervous system is not a sincitial network but is formed by individual cells; the transmission of the nerve impulses follow a main direction within a given neuron; the axons are guided by chemical substances in a chemotropic way, till form synapses with their targets. Attracted by Cajal's strong personality and scientific success, a number of medical students and doctors join him in the crusade to explore the nervous system. And the seed planted by the universal savant was really successful: Francisco Tello described interesting aspects of the regeneration of peripheral nerves which are very useful for neuroscientist currently working in this topic; Nicolás Achúcarro significantly contributed to study neuroglia and future microglia; Pío del Río-Hortega identified two out of the four main nervous cell types, the oligodendrocytes and microglia, and proposed an almost still valid classification for the CNS tumours; Fernando de Castro made was the first description of arterial chemoreceptors in the carotid body; Rafael Lorente de Nó was a dominant figure of Neuroscience for decades after the IInd World War, first describing the columnar organization of the cerebral cortex well before Mountcastle, Hubbel and Wiesel. Even less recognised co-workers and disciples of Cajal (his brother Pedro Ramón y Cajal, Domingo Sánchez, the neurologist Rodríguez-Lafora... protagonised discoveries that are consolidated scientific truths today). Altogether, it is difficult (if not impossible) to find a school in biology contributing in such a fundamental and variated way to the common acervo like the collectively known as Cajal School or Spanish Neurological School. Although the particular way to work of the Maestro, selecting a pleiade of brilliant collaborators with whom accomplish such a titanic feat, giving them freedom for their studies, has been recognised and confronted to antagonic systems followed by other relevant scientists and scientific schools, the general recognition of such a significant major milestones for Neuroscience and their vigency in the well-marched XXIst century is not: this is the purpose of this Ebook, to remind all these examples of how successful can be the scientific work when it is minutious, constant and performed by brilliant, imaginative and skilled scientists with a minimal conditions supporting their efforts.

Download or read book Oligodendrocytes From Their Development to Function and Dysfunction written by Hiroaki Wake and published by Frontiers Media SA. This book was released on 2024-03-12 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Never resting microglia physiological roles in the healthy brain and pathological implications written by Amanda Sierra and published by Frontiers E-books. This book was released on 2015-02-11 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microglia are largely known as the major orchestrators of the brain inflammatory response. As such, they have been traditionally studied in various contexts of disease, where their activation has been assumed to induce a wide range of detrimental effects. In the last few years, a series of discoveries have challenged the current view of microglia, showing their active and positive contribution to normal brain function. This Research Topic reviewed the novel physiological roles of microglia in the developing, mature and aging brain, under non-pathological conditions. In particular, this Research Topic discussed the cellular and molecular mechanisms by which microglia contribute to the formation, pruning and plasticity of synapses; the regulation of adult neurogenesis as well as hippocampal learning and memory; among other important roles. Because these novel findings defy our understanding of microglial function in health as much as in disease, this Research Topic also summarized the current view of microglial nomenclature, phenotypes, origin and differentiation, and contribution to various brain pathologies. Additionally, novel imaging approaches and molecular tools to study microglia in their non-activated state have been discussed. In conclusion, this Research Topic seeked to emphasize how the current research in neuroscience is challenged by never-resting microglia.

Download or read book Neuroglia written by Helmut Kettenmann and published by Oxford University Press. This book was released on 2004-09-30 with total page 1103 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neuroglia is the only comprehensive reference book on the basic biology and function of glial cells. This long-awaited second edition has been completely reorganized and rewritten to include the dramatic advances in this field since the first edition was published ten years ago. The impact of the second edition will be greater than that of the first because the majority of neuroscientists now acknowledge that neuroglia are elemental to most, if not all, brain functions. The second edition covers the entire field of glial research from the basic molecular and cellular principles of these cells to their involvement in neurological diseases including stroke, Alzheimer's disease, and multiple sclerosis. It includes new chapters on transmitter release from exocytosis from glia, glia derived stem cells, glia and synaptic transmission, glia and axon guidance, an entirely new section on mechanisms of glial injury, and several new chapters on the roles of glia in different diseases. The new edition was written with both students and experts in mind. It provides a basic introduction to the entire range of glial topics and detailed information with critical assessment of the research literature. Neuroscience textbooks focus on the properties of neurons, whereas this book fills the information void about the brain's other cells. Neuroglia, Second Edition, is an essential reference source for newcomers, including graduate students, to neuroanatomy, neurochemistry, neurophysiology, and molecular neurobiology. It is also a vital companion for established researchers in these fields as well as clinicians in neurology, neurosurgery, psychiatry, neuropathology, and neuro-oncology.

Download or read book Microglia in Health and Disease A Unique Immune Cell Population written by Alessandro Michelucci and published by Frontiers Media SA. This book was released on 2018-10-05 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microglia are essential for the development and function of the adult brain. Their ontogeny, together with the absence of turnover from the periphery and the singular environment of the central nervous system (CNS), make microglia a unique cell population compared to other tissue-macrophages. The unique properties and functions of microglial cells, such as their role in synaptic pruning or the exceptional capacity to scan the brain parenchyma and rapidly react to its perturbations, have emerged in recent years. In the coming years, understanding how microglia acquire and maintain their unique profiles in order to fulfil distinct tasks in the healthy CNS and how these are altered in disease, will be essential to develop strategies to diagnose or treat CNS disorders with an immunological component. This Research Topic covers several aspects of microglial biology, ranging from their origin and the functional role of microglia during development and lifespan, their molecular properties compared with other brain and peripheral immune cells to microglial phenotypes and functional states in neurodegenerative diseases and brain tumours. In conclusion, the present Research Topic provides a comprehensive overview of our current understanding of several cellular and molecular mechanisms that make microglia a unique immune cell population within the healthy CNS as well as under inflammatory, neurodegenerative and tumorigenic processes.

Download or read book Fundamental Neuroscience written by Larry Squire and published by Academic Press. This book was released on 2008-04-02 with total page 1277 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamental Neuroscience, Third Edition introduces graduate and upper-level undergraduate students to the full range of contemporary neuroscience. Addressing instructor and student feedback on the previous edition, all of the chapters are rewritten to make this book more concise and student-friendly than ever before. Each chapter is once again heavily illustrated and provides clinical boxes describing experiments, disorders, and methodological approaches and concepts.Capturing the promise and excitement of this fast-moving field, Fundamental Neuroscience, 3rd Edition is the text that students will be able to reference throughout their neuroscience careers! 30% new material including new chapters on Dendritic Development and Spine Morphogenesis, Chemical Senses, Cerebellum, Eye Movements, Circadian Timing, Sleep and Dreaming, and Consciousness Additional text boxes describing key experiments, disorders, methods, and concepts Multiple model system coverage beyond rats, mice, and monkeys Extensively expanded index for easier referencing

Download or read book Neuroprogression in Psychiatry written by Flávio Kapczinski and published by Oxford University Press. This book was released on 2019-03-05 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent studies regarding the neuropathology of specific neurological disorders suggest that both neurodevelopmental and neurodegenerative processes may play a role. However, in contrast to the neurodegeneration seen in neurological disorders such as Parkinson's and Alzheimer's disease, the term "neuroprogression" has been used to describe the neurodevelopmental aspect of pathological brain re-wiring that takes place in the context of severe psychiatric disorders, such as schizophrenia or bipolar disorder. Within psychiatry, patients with severe psychopathology, such as those depressed patients who eventually commit suicide, have been shown to present with increased inflammatory markers in the brain. A similar increase in inflammatory markers is also found in patients with bipolar disorders and schizophrenia. Thus, oxidative stress, inflammation, and changes in growth factors are thought to be the pathways of neuroprogression. Neuroprogression in Psychiatry provides a comprehensive summary of the current developments in the emerging field of neuroprogression. With contributions by leading researchers in the field, this book examines the role of neuroprogression across a wide range of specific psychiatric disorders, with chapters included on major depressive disorder, anxiety disorder, post-traumatic stress disorder, substance abuse, schizophrenia, and bipolar disorder.

Download or read book The Lancet written by and published by . This book was released on 1940 with total page 894 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Spinal Cord Injury SCI Repair Strategies written by Giuseppe Perale and published by Woodhead Publishing. This book was released on 2019-10-30 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spinal Cord Injury (SCI) Repair Strategies provides researchers the latest information on potential regenerative approaches to spinal cord injury, specifically focusing on therapeutic approaches that target regeneration, including cell therapies, controlled drug delivery systems, and biomaterials. Dr. Giuseppe Perale and Dr. Filippo Rossi lead a team of authoritative authors in academia and industry in this innovative reference on the field of regenerative medicine and tissue engineering. This book presents all the information readers need to understand the current and potential array of techniques, materials, applications and their benefits for spinal cord repair. Covers current and future repair strategies for spinal cord injury repair Focuses on key research trends, clinics, biology and engineering Provides fundamentals on regenerative engineering and tissue engineering

Download or read book Dendritic Cell and Macrophage Nomenclature and Classification written by Florent Ginhoux and published by Frontiers Media SA. This book was released on 2016-07-14 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mononuclear phagocyte system (MPS) comprises dendritic cells (DCs), monocytes and macrophages (MØs) that together play crucial roles in tissue immunity and homeostasis, but also contribute to a broad spectrum of pathologies. They are thus attractive therapeutic targets for immune therapy. However, the distinction between DCs, monocytes and MØ subpopulations has been a matter of controversy and the current nomenclature has been a confounding factor. DCs are remarkably heterogeneous and consist of multiple subsets traditionally defined by their expression of various surface markers. While markers are important to define various populations of the MPS, they do not specifically define the intrinsic nature of a cell population and do not always segregate a bona fide cell type of relative homogeneity. Markers are redundant, or simply define distinct activation states within one subset rather than independent subpopulations. One example are the steady-state CD11b+ DCs which are often not distinguished from monocytes, monocyte-derived cells, and macrophages due to their overlapping phenotype. Lastly, monocyte fate during inflammation results in cells bearing the phenotypic and functional features of both DCs and MØs significantly adding to the confusion. In fact, depending on the context of the study and the focus of the laboratory, a monocyte-derived cell will be either be called "monocyte-derived DCs" or "macrophages". Because the names we give to cells are often associated with a functional connotation, this is much more than simple semantics. The "name" we give to a population fundamentally changes the perception of its biology and can impact on research design and interpretation. Recent evidence in the ontogeny and transcriptional regulation of DCs and MØs, combined with the identification of DC- and MØ-specific markers has dramatically changed our understanding of their interrelationship in the steady state and inflammation. In steady state, DCs are constantly replaced by circulating blood precursors that arise from committed progenitors in the bone marrow. Similarly, some MØ populations are also constantly replaced by circulating blood monocytes. However, others tissue MØs are derived from embryonic precursors, are seeded before birth and maintain themselves in adults by self-renewal. In inflammation, such differentiation pathways are fundamentally changed and unique monocyte-derived inflammatory cells are generated. Current DC, monocyte and MØ nomenclature does not take into account these new developments and as a consequence is quite confusing. We believe that the field is in need of a fresh view on this topic as well as an upfront debate on DC and MØ nomenclature. Our aim is to bring expert junior and senior scientists to revisit this topic in light of these recent developments. This Research Topic will cover all aspects of DC, monocyte and MØ biology including development, transcriptional regulation, functional specializations, in lymphoid and non-lymphoid tissues, and in both human and mouse models. Given the central position of DCs, monocytes and MØs in tissue homeostasis, immunity and disease, this topic should be of interest to a large spectrum of the biomedical community.

Download or read book Introduction to Single Cell Omics written by Xinghua Pan and published by Frontiers Media SA. This book was released on 2019-09-19 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single-cell omics is a progressing frontier that stems from the sequencing of the human genome and the development of omics technologies, particularly genomics, transcriptomics, epigenomics and proteomics, but the sensitivity is now improved to single-cell level. The new generation of methodologies, especially the next generation sequencing (NGS) technology, plays a leading role in genomics related fields; however, the conventional techniques of omics require number of cells to be large, usually on the order of millions of cells, which is hardly accessible in some cases. More importantly, harnessing the power of omics technologies and applying those at the single-cell level are crucial since every cell is specific and unique, and almost every cell population in every systems, derived in either vivo or in vitro, is heterogeneous. Deciphering the heterogeneity of the cell population hence becomes critical for recognizing the mechanism and significance of the system. However, without an extensive examination of individual cells, a massive analysis of cell population would only give an average output of the cells, but neglect the differences among cells. Single-cell omics seeks to study a number of individual cells in parallel for their different dimensions of molecular profile on genome-wide scale, providing unprecedented resolution for the interpretation of both the structure and function of an organ, tissue or other system, as well as the interaction (and communication) and dynamics of single cells or subpopulations of cells and their lineages. Importantly single-cell omics enables the identification of a minor subpopulation of cells that may play a critical role in biological process over a dominant subpolulation such as a cancer and a developing organ. It provides an ultra-sensitive tool for us to clarify specific molecular mechanisms and pathways and reveal the nature of cell heterogeneity. Besides, it also empowers the clinical investigation of patients when facing a very low quantity of cell available for analysis, such as noninvasive cancer screening with circulating tumor cells (CTC), noninvasive prenatal diagnostics (NIPD) and preimplantation genetic test (PGT) for in vitro fertilization. Single-cell omics greatly promotes the understanding of life at a more fundamental level, bring vast applications in medicine. Accordingly, single-cell omics is also called as single-cell analysis or single-cell biology. Within only a couple of years, single-cell omics, especially transcriptomic sequencing (scRNA-seq), whole genome and exome sequencing (scWGS, scWES), has become robust and broadly accessible. Besides the existing technologies, recently, multiplexing barcode design and combinatorial indexing technology, in combination with microfluidic platform exampled by Drop-seq, or even being independent of microfluidic platform but using a regular PCR-plate, enable us a greater capacity of single cell analysis, switching from one single cell to thousands of single cells in a single test. The unique molecular identifiers (UMIs) allow the amplification bias among the original molecules to be corrected faithfully, resulting in a reliable quantitative measurement of omics in single cells. Of late, a variety of single-cell epigenomics analyses are becoming sophisticated, particularly single cell chromatin accessibility (scATAC-seq) and CpG methylation profiling (scBS-seq, scRRBS-seq). High resolution single molecular Fluorescence in situ hybridization (smFISH) and its revolutionary versions (ex. seqFISH, MERFISH, and so on), in addition to the spatial transcriptome sequencing, make the native relationship of the individual cells of a tissue to be in 3D or 4D format visually and quantitatively clarified. On the other hand, CRISPR/cas9 editing-based In vivo lineage tracing methods enable dynamic profile of a whole developmental process to be accurately displayed. Multi-omics analysis facilitates the study of multi-dimensional regulation and relationship of different elements of the central dogma in a single cell, as well as permitting a clear dissection of the complicated omics heterogeneity of a system. Last but not the least, the technology, biological noise, sequence dropout, and batch effect bring a huge challenge to the bioinformatics of single cell omics. While significant progress in the data analysis has been made since then, revolutionary theory and algorithm logics for single cell omics are expected. Indeed, single-cell analysis exert considerable impacts on the fields of biological studies, particularly cancers, neuron and neural system, stem cells, embryo development and immune system; other than that, it also tremendously motivates pharmaceutic RD, clinical diagnosis and monitoring, as well as precision medicine. This book hereby summarizes the recent developments and general considerations of single-cell analysis, with a detailed presentation on selected technologies and applications. Starting with the experimental design on single-cell omics, the book then emphasizes the consideration on heterogeneity of cancer and other systems. It also gives an introduction of the basic methods and key facts for bioinformatics analysis. Secondary, this book provides a summary of two types of popular technologies, the fundamental tools on single-cell isolation, and the developments of single cell multi-omics, followed by descriptions of FISH technologies, though other popular technologies are not covered here due to the fact that they are intensively described here and there recently. Finally, the book illustrates an elastomer-based integrated fluidic circuit that allows a connection between single cell functional studies combining stimulation, response, imaging and measurement, and corresponding single cell sequencing. This is a model system for single cell functional genomics. In addition, it reports a pipeline for single-cell proteomics with an analysis of the early development of Xenopus embryo, a single-cell qRT-PCR application that defined the subpopulations related to cell cycling, and a new method for synergistic assembly of single cell genome with sequencing of amplification product by phi29 DNA polymerase. Due to the tremendous progresses of single-cell omics in recent years, the topics covered here are incomplete, but each individual topic is excellently addressed, significantly interesting and beneficial to scientists working in or affiliated with this field.

Download or read book Glial Physiology and Pathophysiology written by Alexei Verkhratsky and published by John Wiley & Sons. This book was released on 2013-01-31 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: Glial Physiology and Pathophysiology provides a comprehensive, advanced text on the biology and pathology of glial cells. Coverae includes: the morphology and interrelationships between glial cells and neurones in different parts of the nervous systems the cellular physiology of the different kinds of glial cells the mechanisms of intra- and inter-cellular signalling in glial networks the mechanisms of glial-neuronal communications the role of glial cells in synaptic plasticity, neuronal survival and development of nervous system the cellular and molecular mechanisms of metabolic neuronal-glial interactions the role of glia in nervous system pathology, including pathology of glial cells and associated diseases - for example, multiple sclerosis, Alzheimer's, Alexander disease and Parkinson's Neuroglia oversee the birth and development of neurones, the establishment of interneuronal connections (the 'connectome'), the maintenance and removal of these inter-neuronal connections, writing of the nervous system components, adult neurogenesis, the energetics of nervous tissue, metabolism of neurotransmitters, regulation of ion composition of the interstitial space and many, many more homeostatic functions. This book primes the reader towards the notion that nervous tissue is not divided into more important and less important cells. The nervous tissue functions because of the coherent and concerted action of many different cell types, each contributing to an ultimate output. This reaches its zenith in humans, with the creation of thoughts, underlying acquisition of knowledge, its analysis and synthesis, and contemplating the Universe and our place in it. An up-to-date and fully referenced text on the most numerous cells in the human brain Detailed coverage of the morphology and interrelationships between glial cells and neurones in different parts of the nervous system Describes the role og glial cells in neuropathology Focus boxes highlight key points and summarise important facts Companion website with downloadable figures and slides

Download or read book Encephalitis Lethargica written by Paul Bernard Foley and published by Springer. This book was released on 2018-02-07 with total page 1083 pages. Available in PDF, EPUB and Kindle. Book excerpt: Encephalitis lethargica (‘sleeping sickness’) was a mysterious disorder that swept the world in the decade following the First World War, before disappearing without its cause having been identified. Around 85% of its victims, predominantly children, adolescents and younger adults, survived the acute disorder, but most developed severe neurological syndromes, particularly severe post-encephalitic parkinsonism and other severe motor abnormalities, that incapacitated them for the remainder of their lives. Despite its brief history, encephalitis lethargica played a major role in a variety medical discussions between the two World Wars, as this epitome of neuropsychiatric disease – attacking both motor and mental functions – appeared just as the separation of neurology and psychiatry had reached a critical point. Encephalitis lethargica sufferers presented an unprecedented combination of neurologic and psychiatric symptoms – including previously puzzling phenomena primarily associated with schizophrenia and hysteria, as well as behavioral changes and attention deficit disorders in children – that not only underscored the unity of mind and movement in the CNS, but also illuminated the critical role played by subcortical structures in consciousness and other higher mental functions that had formerly been associated with the soul and more recently presumed to be localized to the human cerebral cortex. Encephalitis lethargica exerted a greater influence on clinical and theoretic neuroscientific thought between the two World Wars than any other single disorder and had an enduring impact upon neurology and psychiatry. This book will be of interest to an educated audience active or interested in clinical (neurology, psychiatry, psychology) or laboratory neuroscience, particularly those interested in neuropsychiatry, as well as to those interested in the history of the biomedical sciences.

Download or read book Neuroimmune Diseases written by Hiroshi Mitoma and published by Springer. This book was released on 2019-08-13 with total page 822 pages. Available in PDF, EPUB and Kindle. Book excerpt: A translational overview of neuroimmune diseases for neuroscientists and clinicians that clarifies the pathological mechanisms underlying neuroimmune diseases and builds a comprehensive bridge between the latest research findings and their clinical implications in daily practice. The material is presented in two steps. The first section comprises a review of the pathogenic actions of immune cells in brain diseases. Here the authors discuss the mechanisms through which immune cells disrupt the functions of nerve cells. The second section explores the ways in which the brain becomes dysfunctional due to impaired nerve cell function. Based on pathogenesis, diagnostic and therapeutic strategies are discussed for each clinical category. The book will be invaluable for use in clinical practice of neuroimmune diseases

Download or read book The Biology of Oligodendrocytes written by Patricia Armati and published by Cambridge University Press. This book was released on 2010-10-21 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Traditionally, oligodendrocytes have been assumed to play a minor supporting role in the central nervous system and their importance has generally been overlooked. For the first time, this book provides a dedicated review of all of the major aspects of oligodendrocyte biology, including development, organization, genetics, and immunobiology. Later chapters emphasize the importance of this underestimated cell to the mammalian central nervous system by exploring the role of myelin synthesis and maintenance in neural disease and repair. Particular attention is paid to multiple sclerosis (MS), arguably the prime example of an acquired demyelinating disease, with detailed examinations of the current concepts regarding demyelination, oligodendroglial damage, and remyelination in MS lesions.