Author: Leslie Iversen
Publisher: Springer Science & Business Media
ISBN: 1468431773
Category : Psychology
Languages : en
Pages : 393

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Author: Maria Elisa Calcagnotto
Publisher: Frontiers Media SA
ISBN: 2889458911
Category :
Languages : en
Pages : 136

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Author: Francisco F. De-Miguel
Publisher: Frontiers E-books
ISBN: 2889191095
Category :
Languages : en
Pages : 152

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Book Description
Extrasynaptic transmission is a unifying term for a wide variety of cellular processes, in which outside of synaptic terminals transmitter substances activate extrasynaptic receptors. Whereas “synaptic transmission” immediately refers to a process occurring at nerve terminals in which the arrival of a presynaptic impulse evokes exocytosis followed by a postsynaptic response within a millisecond time scale, extrasynaptic transmission has a wide diversity of ultrastructural and therefore mechanistic associated phenomena. In comparison to synaptic, extrasynaptic exocytosis may last for seconds or even minutes, thus expanding the timing of neuronal signaling. Extrasynaptic transmission has now been demonstrated in central and peripheral neurons of vertebrates and invertebrates, and involves many different types of transmitter substances than include low molecular weight transmitters (acetilcholine, GABA, glutamate, ATP, and biogenic amines) and peptides (substance P, vasopressin and others). It may occur when transmitters leak out from the synaptic cleft and activate extrasynaptic receptors in neighboring neurons or glial cells, or when axonal varicosities, dendrites or the somata release transmitters in the absence of postsynaptic counterparts. The release mechanisms also vary from one neuron type to another and from one neuronal compartment to another. In some cases, clear vesicles are apposed to the resting plasma membrane, as in presynaptic terminals. In other cases, transmitters are packed onto dense core vesicles that rest at a distance from the release sites. In between, there are multiple morphological combinations that point to complementary mechanisms in different compartments of the same neuron and some times, even in the same compartment. For example, serotonergic varicosities may combine clear and dense core vesicles in stereotyped arrays. This diversity adds complexity to the nervous system and raises many questions that are waiting for answers. Extrasynaptic transmission may be the main source of transmitter molecules causing volume transmission, however this still lacks direct demonstration. From the physiological point of view, one may ask how does the neuronal firing pattern evokes synaptic or extrasynaptic transmitter release or what are the physiological effects of these modes of transmission. From the behavioral point of view it becomes interesting to explore how circuits and therefore behaviors are modulated. Some neurological disfunctions may also be related to deficiencies in extrasynaptic transmission, however, again, direct studies are still lacking. Developmental and evolutionary biologists may also find the topic inspiring. Extrasynaptic transmission not only expands our view about how the nervous system works, but also requires a change in the way we plan our research. New technological and computational tools are now being applied to analyze intracellular and extracellular transmitter mobilizations or long term changes of neuronal circuits. New definitions and mechanisms may become visible. In the meanwhile, this seems to be a good moment for a first common effort to analyze and discuss extrasynaptic transmission in different systems and from different perspectives.

Author: Wulfram Gerstner
Publisher: Cambridge University Press
ISBN: 1107060834
Category : Computers
Languages : en
Pages : 591

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Book Description
This solid introduction uses the principles of physics and the tools of mathematics to approach fundamental questions of neuroscience.

Author: Thomas C. Südhof
Publisher: Springer Science & Business Media
ISBN: 3540748059
Category : Medical
Languages : en
Pages : 582

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Book Description
It has been known for half a century that neurotransmitters are released in preformed quanta, that the quanta represent transmitter-storing vesicles, and that release occurs by exocytosis. The focus of this book is twofold. In the first part, the molecular events of exocytosis are analysed. In the second part of the book, the presynaptic receptors for endogenous chemical signals are presented that make neurotransmitter release a highly regulated process.

Author: Andrea Volterra
Publisher: Oxford University Press, USA
ISBN: 9780198508540
Category : Medical
Languages : en
Pages : 272

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Book Description
Accompanying CD-ROM contains ... "additional images, movies, and animated sequences." -- p. [4] of cover.

Author: Adam C. Errington
Publisher: Springer
ISBN: 149391426X
Category : Medical
Languages : en
Pages : 301

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Book Description
GABA is the principal inhibitory neurotransmitter in the CNS and acts via GABAA and GABAB receptors. Recently, a novel form of GABAA receptor-mediated inhibition, termed “tonic” inhibition, has been described. Whereas synaptic GABAA receptors underlie classical “phasic” GABAA receptor-mediated inhibition (inhibitory postsynaptic currents), tonic GABAA receptor-mediated inhibition results from the activation of extrasynaptic receptors by low concentrations of ambient GABA. Extrasynaptic GABAA receptors are composed of receptor subunits that convey biophysical properties ideally suited to the generation of persistent inhibition and are pharmacologically and functionally distinct from their synaptic counterparts. This book highlights ongoing work examining the properties of recombinant and native extrasynaptic GABAA receptors and their preferential targeting by endogenous and clinically relevant agents. In addition, it emphasizes the important role of extrasynaptic GABAA receptors in GABAergic inhibition throughout the CNS and identifies them as a major player in both physiological and pathophysiological processes.

Author: Marzia Malcangio
Publisher: Springer
ISBN: 9781441902252
Category : Medical
Languages : en
Pages : 504

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Book Description
Primary sensory neurons respond to peripheral stimulation and project to the spinal cord. Specifically, the population of neurons which respond to damaging stimuli terminate in the superficial layers of the dorsal horn. Therefore, the dorsal horns constitute the first relay site for nociceptive fibre terminals which make synaptic contacts with second order neurons. It has recently become clear that the strength of this first pain synapse is plastic and modifiable by several modulators, including neuronal and non-neuronal regulators, and studies on the fundamental processes regulating the plasticity of the first pain synapse have resulted in the identification of new targets for the treatment of chronic pain. This book will be of interest to a wide readership in the pain field.

Author:
Publisher: Academic Press
ISBN: 0123786487
Category : Medical
Languages : en
Pages : 521

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Book Description
This monograph was assembled to honor Professor Norman Bowery and his work on the 30th anniversary of his discovery of the GABAB receptor. In the present volume, leading neuroscientists from academia and industry provide a perspective of current research, both basic and translational, in the discovery of drugs acting at the GABAB receptor. The topics covered provide a comprehensive review of the field and the current state of research in this area. Included are chapters on the chemistry of GABAB agonists and antagonists, on the genetics and molecular composition of the site, its regulation and trafficking, and its role in controlling cellular, autonomic, and behavioral function. There are also chapters describing the potential clinical utility of drugs regulating GABAB activity receptor in the areas of hypertension, gastroesophageal reflux disease, Down syndrome, depression, and substance abuse. The information contained in this text will be of particular interest to neuroscientists in general and to neuropharmacologists in particular. - Articles written by leading investigators in the field - Informs and updates on all the latest developments

Author: John C. Eccles
Publisher: Springer Science & Business Media
ISBN: 3642649505
Category : Medical
Languages : en
Pages : 328

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Book Description
I must thank my friend, Professor HANS WEBER, for being, as it were, the prime mover in causing this book to be written. He persuaded me in 1960 to contribute a review to the Ergebnisse der Physiologie. As originally planned, it was to be relatively short. However, the interest and scope of the whole subject of synapses stimulated me to write a much more comprehensive and extensive account. I was not even then satisfied, particularly as so many new and attractive investigations and ideas were being evolved during and after the writing of this review; and during the writing of this book most interesting developments are occurring in so many centres of research. Through the kind cooperation of my friends I have been given the opportunity to quote and even to illustrate from these new and fascinating developments before their final publication. There would be some justification if the author were to make the claim that this book is the fruit of a life-time of enquiry into the physiology of synapses. In 1927 the subject of Excitatory and Inhibitory Synapses was chosen for investigation in the course leading to the Oxford D. Phil. But there have been such remarkable developments during the last 12 years that in this book very little reference will be made to work earlier than 1951 except in the historical introductions.