Download or read book Retinal Glia written by Andreas Reichenbach and published by Biota Publishing. This book was released on 2015-02-01 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1851, Heinrich Müller discovered what he called “radial fibers” and what we now call Müller cells, as the principal glial cells of the vertebrate retina. Later on, other glial cell types were found in the retina, including astrocytes, microglia, and even oligodendrocytes. It turned out that retinal glial cells are essential constituents of the tissue. For instance, Müller cells appear to constitute the “core” of columnar units of clonally and functionally related groups of neurons. Their primary function is to support neuronal functioning by guiding the light towards the photoreceptor cells, removing excess neurotransmitter molecules from extracellular space, and performing efficient clearance of excess extracellular potassium ions. The latter two functions are also crucial for neuronal survival and are coupled to water clearance which is also essential. Müller cells are capable of “sensing” neuronal activity and modifying it by the release of signal substances (gliotransmitters). In cases of retinal injuries the Müller cells become reactive, and all above-mentioned functions are impaired. However, such de-differentiated Müller cells may proliferate, and may even serve as stem cells for the regeneration of a damaged retina. As well as the Müller cells, retinal astrocytes and microglial cells are important players in retinal development and function. This book gives a comprehensive survey of the present knowledge on retinal glia.

Download or read book Webvision written by Helga Kolb and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book na written by Andreas Reichenbach and published by Springer Science & Business Media. This book was released on 2011-02-18 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: Müller cells make up just 0.005% of the cells in our central nervous system. They do not belong to the more esteemed family of neuronal cells but to the glia, a family of cells that until recently were seen as mere filling material between the neurons. Now, however, all that has changed. Sharing the insights of more than a quarter century of research into Müller cells, Drs. Andreas Reichenbach and Andreas Bringmann of Leipzig University make a compelling case for the central role Müller cells play. Everyone agrees that the eye is a very special and versatile sense organ, yet it has turned out in recent years that Müller cells are peculiar and multipotent glial cells. In the retina of most vertebrates and even of many mammals, Müller cells are the only type of (macro- ) glial cells; thus, they are responsible for a wealth of neuron-supportive functions that, in the brain, rely upon a division of labour among astrocytes, oligodendrocytes, and ependymal cells. Even beyond such a role in the central nervous system as "model glia", Müller cells are adapted to several exciting roles in support of vision. They deliver the light stimuli to the photoreceptor cells in the inverted vertebrate retina, aid the processing of visual information, and are responsible for the homeostatic maintenance of the retinal extracellular milieu. In Müller Cells in the Healthy and Diseased Retina, aimed not just at neurobiologists but at anyone concerned with retinal degeneration, every angle of Müller cells is covered, from an introduction to their basic properties, through their roles as 'light cables' and 'shock absorbers', to the part they play in diseases and disorders of the eye. Once these have all been covered in detail, the authors move on to discuss the future direction of research into these small but potent cellular phenomena. About the Authors Dr. Andreas Reichenbach was born in 1950 in Leipzig, Germany. He studied medicine and specialized as a physiologist, working on the mammalian retina. Since 1984, he has focused his efforts - and those of a growing number of fellows in his team - on Müller cell research. He has held a professorship at Leipzig University since 1994. After studying biology, Dr. Andreas Bringmann (* 1960) worked in the field of systemic neurophysiology until he was inspired in 1996 by Andreas Reichenbach to research the most interesting cell, the Müller cell. He is now in the Department of Ophthalmology of the University of Leipzig where he is the head of the Basic Research Laboratory

Download or read book The Retinal M ller Cell written by Vijay Sarthy and published by Springer Science & Business Media. This book was released on 2005-12-08 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: The human brain contains more than a billion neurons which interconnect to form networks that process, store, and recall sensory information. These neuronal activities are supported by a group of accessory brain cells coll- tively known as neuroglia. Surprisingly, glial cells are ten times more - merous than neurons, and occupy more than half the brain volume (Hydén, 1961). Although long considered a passive, albeit necessary, component of the nervous system, many interesting and unusual functional properties of glial cells are only now being brought to light. As a result, the status of these cellular elements is approaching parity with nerve cells as a subject for experimental study. The term glia (or glue) seems today to be a misnomer in view of the diverse functions attributed to glial cells. Experimental studies in the last three decades have clearly established that the behavior of glial cells is far from passive, and that they are at least as complex as neurons with regard to their membrane properties. In addition, glial cells are of importance in signal processing, cellular metabolism, nervous system development, and the pathophysiology of neurological diseases. The Müller cell of the ver- brate retina provides a splendid example of an accessory cell that exhibits features illustrating every aspect of the complex behavior now associated with glial cells.

Download or read book Neurobiology and Clinical Aspects of the Outer Retina written by M.B. Djamgoz and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 503 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the cellular biology, biochemistry and physiology of photoreceptors and their interactions with the second-order neurons, bipolar and horizontal cells. The focus is upon the contributions made by these neurons to vision. Thus the basic neurobiology of the outer retina is related to the visual process, and visual defects that could arise from abnormalities in this part of the retina are highlighted in the first 16 chapters. Since all vertebrate retinas have the same basic structure and physiological plan, examples are given from a variety of species, with an emphasis upon mammals, extending to human vision. The last four chapters approach the problem from the other end. This part of the book covers a range of clinical conditions involving visual abnormalities that are due to cellular defects in the outer retina. Although the contents of this book do not represent the proceedings of a conference, the concept arose at an international symposium on 'Recent Advances in Retinal Research' which was held at the International Marine Centre in Oristano, Sardinia. We hope that the book will give a coherent, up to date review of the neurobiology and clinical aspects of the outer retina and encourage further integration of these areas. Retinal neurobiology has been an intense field of investigation for several decades. More recently, it has seen significant advances with the application of modern techniques of cell and molecular biology.

Download or read book Understanding Glial Cells written by Bernardo Castellano and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 435 pages. Available in PDF, EPUB and Kindle. Book excerpt: A collection of selected works presented by Spanish research teams at the establishment and consolidation of the Spanish Glial Network in February 1997. Includes: morphology and ontogeny, molecular and biochemical properties, pathology, and involvement in damage and regeneration. For researchers, clinicians, students, and teachers.

Download or read book Unlocking the Potential Within written by Sheena and published by Tredition Gmbh. This book was released on 2024-07-02 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deep within the retina, a hidden champion for vision awaits. Müller glia, long considered mere supporting cells, are now emerging as a potential key to unlocking treatments for retinal diseases. These star-shaped cells play a vital role beyond just structure. They act as the retina's workhorses, maintaining its delicate balance, removing waste, and nourishing vital photoreceptor cells. When this balance is disrupted, diseases like macular degeneration can rob us of sight. However, research suggests that by understanding and manipulating Müller glia's regenerative potential, we might be able to restore vision or even prevent retinal degeneration altogether. Unlocking the potential within these glial cells could be the key to a future where vision loss is no longer a threat.

Download or read book Retinal Development written by Evelyne Sernagor and published by Cambridge University Press. This book was released on 2012-11-29 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: This advanced text, first published in 2006, takes a developmental approach to the presentation of our understanding of how vertebrates construct a retina. Written by experts in the field, each of the seventeen chapters covers a specific step in the process, focusing on the underlying molecular, cellular, and physiological mechanisms. There is also a special section on emerging technologies, including genomics, zebrafish genetics, and stem cell biology that are starting to yield important insights into retinal development. Primarily aimed at professionals, both biologists and clinicians working with the retina, this book provides a concise view of vertebrate retinal development. Since the retina is 'an approachable part of the brain', this book will also be attractive to all neuroscientists interested in development, as processes required to build this exquisitely organized system are ultimately relevant to all other parts of the central nervous system.

Download or read book M ller Cells in the Healthy and Diseased Retina written by Andreas Reichenbach and published by Springer. This book was released on 2010-03-18 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: Müller cells may be used in the future for novel therapeutic strategies to protect neurons against apoptosis (for example, somatic gene therapy), or to differentiate retinal neurons from Müller/stem cells. Meanwhile, a proper understanding of the gliotic responses of Müller cells in the diseased retina, and of their protective vs. detrimental effects, is essential for the development of efficient therapeutic strategies that use and stimulate the neuron-supportive/-protective - and prevent the destructive - mechanisms of gliosis.

Download or read book Therapies for Retinal Degeneration written by de la Rosa (Enrique J.) and published by Royal Society of Chemistry. This book was released on 2018 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses approaches to the treatment of retinal diseases, targeting common processes and components.

Download or read book Stimulating Retinal Neurogenesis from M ller Glia written by Julia Pollak and published by . This book was released on 2013 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Damage to the retina, through disease or injury, can lead to the permanent loss of neurons and ultimately loss of vision. Non-mammalian vertebrates have a robust ability to regenerate injured retinal neurons from Müller glial cells that activate the gene encoding the proneural factor Achaete-scute homolog 1 (Ascl1) and de-differentiate into progenitor cells. By contrast, mammalian Müller glia have a limited regenerative response and fail to upregulate Ascl1 after injury. In this work, I explored whether neurogenic transcription factors, including Ascl1, could restore neurogenic potential to mammalian Müller glia by overexpressing these factors in dissociated mouse Müller glial cultures and intact retinal explants. ASCL1-infected Müller glia upregulated retinal progenitor-specific genes and downregulated glial genes. Furthermore, ASCL1 remodeled the chromatin at its targets from a repressive to an active configuration. Müller glia-derived progenitors differentiated into cells that exhibited neuronal morphologies, expressed retinal subtype-specific neuronal markers and displayed neuron-like physiological responses. Additional neurogenic activators potentiated some of these effects. These results indicate that neural-promoting transcription factors can induce a neurogenic state in mature Müller glia, providing an alternative strategy for repair of the retina after disease or injury.

Download or read book Pituitary Adenylate Cyclase Activating Polypeptide written by Hubert Vaudry and published by Springer Science & Business Media. This book was released on 2003 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pituitary Adenylate Cyclase-Activating Polypeptide is the first volume to be written on the neuropeptide PACAP. It covers all domains of PACAP from molecular and cellular aspects to physiological activities and promises for new therapeutic strategies. Pituitary Adenylate Cyclase-Activating Polypeptide is the twentieth volume published in the Endocrine Updates book series under the Series Editorship of Shlomo Melmed, MD.

Download or read book M ller Glia and Notch Signaling in Zebrafish Retinal Development and Regeneration written by Rebecca L. Bernardos and published by . This book was released on 2006 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Primate Retina and Choroid written by Wolf Krebs and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents Introduction .......................................... . 1 The Primate Eye ...................................... . 2 Embryology of Retina and Choroid ....................... . 4 Microscopic Anatomy .................................. . 4 Retina ............................................ . 4 Choroid ........................................... . 8 Material and Methods .................................. . 10 Fine Structure of the Retina 14 RetinaI Pigment Epithelium ............................. . 16 Photoreceptor Cells ................................... . 30 Outer Plexiform Layer and Horizontal Cells .................. . 64 Bipolar, Radial Clial, and Amacrine Cells .................... . 76 Canglion Cells and InternaI Limiting Membrane ............... . 98 Spatial Density of RetinaI Cells .......................... . 112 Fine Structure of the Choroid ........................... . 116 Choroidocapillaris and Its Fiber System ..................... . 118 Arteries, Veins, and Lymphatic Spaces ...................... . 134 Choroidal Nerves .................................... . 142 Cells of Choroidal Connective Tissue ....................... . 148 References ........................................... . 153 Index ................................................ . 157 vii This volume describes the morphology of the primate re tina as seen with the electron microscope. As it is an atlas, the electron micrographs are its most In trad lietian important part. The text accompanies the figures, highlighting selected topics either to explain structures or to point out structure-function relation ships. A scholarly review of the whole spectrum of research on the re tina and choroid is not feasible in a single volume. Thus, whenever available, review artides or monographs, rather than original work, are cited for reference.

Download or read book The Retinal Muller Cell written by Vijay Sarthy and published by . This book was released on 2014-09-01 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Astrocytes and Epilepsy written by Jacqueline A. Hubbard and published by Academic Press. This book was released on 2016-07-05 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt: Epilepsy is a devastating group of neurological disorders characterized by periodic and unpredictable seizure activity in the brain. There is a critical need for new drugs and approaches given than at least one-third of all epilepsy patients are not made free of seizures by existing medications and become "medically refractory". Much of epilepsy research has focused on neuronal therapeutic targets, but current antiepileptic drugs often cause severe cognitive, developmental, and behavioral side effects. Recent findings indicate a critical contribution of astrocytes, star-shaped glial cells in the brain, to neuronal and network excitability and seizure activity. Furthermore, many important cellular and molecular changes occur in astrocytes in epileptic tissue in both humans and animal models of epilepsy. The goal of Astrocytes and Epilepsy is to comprehensively review exciting findings linking changes in astrocytes to functional changes responsible for epilepsy for the first time in book format. These insights into astrocyte contribution to seizure susceptibility indicate that astrocytes may represent an important new therapeutic target in the control of epilepsy. Astrocytes and Epilepsy includes background explanatory text on astrocyte morphology and physiology, epilepsy models and syndromes, and evidence from both human tissue studies and animal models linking functional changes in astrocytes to epilepsy. Beautifully labelled diagrams are presented and relevant figures from the literature are reproduced to elucidate key findings and concepts in this rapidly emerging field. Astrocytes and Epilepsy is written for neuroscientists, epilepsy researchers, astrocyte investigators as well as neurologists and other specialists caring for patients with epilepsy. Presents the first comprehensive book to synthesize historical and recent research on astrocytes and epilepsy into one coherent volume Provides a great resource on the field of astrocyte biology and astrocyte-neuron interactions Details potential therapeutic targets, including chapters on gap junctions, water and potassium channels, glutamate and adenosine metabolism, and inflammation

Download or read book Regulation of Gliosis in the Mouse Retina written by Subramanian Dharmarajan and published by . This book was released on 2017 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: The glial cells of the retina aid in function and maintenance of the retina. The macroglia, Muller cells and the retinal astrocytes, become reactive following injury or disease in the retina, a response that is characterized by hypertrophy, dedifferentiation, loss of functionality, proliferation, and remodeling of tissue and extracellular matrix (ECM). The microglia which are the resident macrophages, also respond to injury/disease becoming activated, undergoing characteristic molecular and morphological changes, which include regulation of secreted factors, changes in inflammatory response and increased phagocytosis. Reactivity in Muller glia is thought to be the result of secreted signals, such as epidermal growth factor, ciliary neurotrophic factor, and broblast growth factor, which are released at the injury site to interact with quiescent glial cells. Furthermore, microglia and macroglia have been shown by some studies to interact following activation. While BMPs are known to be upregulated following injury in the CNS, little information is available concerning their role in reactive gliosis in the retina. We hypothesize that BMP7 indirectly triggers Muller gliosis by activating microglia. Using RT-qPCR, immunofluorescence and western blot, we assessed changes in gliosis markers in the mouse retinal glia following treatment with BMP. Our results showed that BMP7 was able to trigger Muller cell gliosis in the retina in vitro and in vivo. Furthermore, ablation of microglia lead to a subdued gliosis response in the mouse retina following BMP7 exposure. Thus, BMP7 triggers activation of retinal microglia in addition to the Muller glia. IFN-gamma and IL6 could play a role in microglia mediated activation of Muller glia, following exposure to BMP7. We also assessed the role of the Hippo/YAP pathway in the regulation of gliosis in the retina. We demonstrated that YAP was localized to the nucleus of the Muller cells of the retina and was upregulated in IFN-gamma induced gliosis in the mouse retina.