Heterogeneity of Neuronal Nicotinic Acetylcholine Receptors in Rat Nervous System and Their Differential Regulation by Chronic Administration of Nicotine

Heterogeneity of Neuronal Nicotinic Acetylcholine Receptors in Rat Nervous System and Their Differential Regulation by Chronic Administration of Nicotine

Author: Danyan Mao

Publisher:

Published: 2007

Total Pages: 151

ISBN-13: 9780549002963

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Neuronal nicotinic acetylcholine receptors (nAChRs) are present throughout the central and peripheral nervous systems. Native nAChRs are not only heterogeneous in subtypes but also complex in subunit composition. In the present study, we used receptor binding and immunoprecipitation methods to examine the nAChRs in a number of peripheral ganglia and brain regions from adult rat. In the periphery, nAChRs were found in superior cervical ganglia (SCG), nodose, stellate, and pelvic ganglia. However, density of the nAChRs in SCG was ∼10 to 50 times higher than those in the other ganglia. A majority of the nAChRs in SCG and nodose ganglia contained alpha3 and beta4 subunits, but a significant fraction of the nAChRs in these ganglia also contained alpha5 and beta2 subunits. Sequential immunoprecipitations in SCG revealed that all alpha5 subunits were associated with alpha3 and beta4 subunits, forming the mixed heteromeric alpha3beta4alpha5 subtype, representing 25--30% of the total heteromeric nAChRs in SCG; also, 55--60% and 10--15% of the nAChRs were simple alpha3beta4 and mixed alpha3beta4beta2 subtype, respectively. In brain, in addition to the predominant alpha4 and beta2 subunits, we found significant fractions of nAChRs contain alpha5 subunit, ranging from ∼one-tenth of the total nAChRs in superior colliculus to more than one-third in hippocampus. Moreover, alpha5 subunit was exclusively incorporated in the alpha4beta2 nAChRs, forming the mixed heteromeric alpha4beta2alpha5 subtype in hippocampus, striatum, cerebral cortex and thalamus. Most importantly, during chronic administration of nicotine in rats, density of the alpha4beta2alpha5 subtype did not change, despite significant up-regulation of the alpha4beta2* and alpha3beta2* nAChRs in brain. This differential regulatory effect of nicotine also extended to other nAChR subtypes. Similar to the alpha4beta2alpha5 subtype, nAChRs containing beta3 subunit in striatum and superior colliculus, most likely in the composition of alpha6beta2beta3*, appeared resistant to regulation by nicotine, whereas the overall density of the alpha6-containing nAChRs decreased in striatum, but remained the same in superior colliculus. The differential regulation by chronic nicotine may not only provide new clues to the mechanisms of nicotine-induced up-regulation of nAChRs in brain, but also have important implications in various aspects of nicotine addiction.


Neuronal Acetylcholine Receptors

Neuronal Acetylcholine Receptors

Author: V.I. Skok

Publisher: Springer

Published: 2012-03-22

Total Pages: 332

ISBN-13: 9781468416701

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Among the different types of receptors for neurotransmitters, nicotinic acetyl choline receptors were the first to be studied systematically; at present they are very well characterized. This is due to the discovery of two very convenient objects that are endowed with nicotinic acetylcholine receptors - the skeletal muscle and the electric organ. The large size of skeletal muscle fibers, which simplifies the intra cellular recording of transmembrane potentials and currents, played a crucial role in obtaining the fIrst quantitative estimates of the activity of acetylcholine receptors and the kinetics of their interaction with ligands. On the other hand, the extremely high content of receptor protein in the electric organ tissue - two orders higher than in muscle tissue - rendered it highly suitable for studying the biochemistry of recep tors. The combination of pharmacological, electrophysiological, and biochemical approaches resulted in rapid progress in the investigation of acetylcholine receptors. Nicotinic acetylcholine receptors are also present in the neurons of autonomic ganglia, in the central nervous system of vertebrates, and in the ganglion neurons of invertebrates. Although each of these three types of receptors has its own pharma cological specificity, some of their properties are common and differ from those in the acetylcholine receptors of skeletal muscle and electric organ. One of these differences is that neuronal nicotinic receptors usually coexist in the same nerve cell with other receptors, e. g. , muscarinic, serotoninergic, or peptidergic.


Nicotinic Acetylcholine Receptors in Health and Disease

Nicotinic Acetylcholine Receptors in Health and Disease

Author: R. Thomas Boyd

Publisher: Academic Press

Published: 2023-03-14

Total Pages: 292

ISBN-13: 0128204184

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Nicotinic Acetylcholine Receptors in Health and Disease provides the latest information Nicotinic acetylcholine receptors (nAChRs), which are involved in numerous diseases, including Alzheimer’s, Parkinson’s, and schizophrenia, and are important potential translational targets for treatment of these diseases, as well as therapy for addiction. This book focuses on the roles and function of nAChRs inside and outside of the nervous system, with an emphasis on translational implications and future prospects for the treatment of numerous disorders. This greater understanding of the basic neurobiology and clinical roles of nAChRs provides important insights for future clinical treatments of many major disorders. Describes the roles, expression and function of nicotinic receptors Includes receptor involvement, both inside and outside the nervous system Details nicotinic receptor involvement in Alzheimer’s, Parkinson’s, Cancer, Schizophrenia, and more Emphasizes future treatment prospects of disorders via modulation of nAChR signaling


Neuronal Acetylcholine Receptors

Neuronal Acetylcholine Receptors

Author: V.I. Skok

Publisher: Springer

Published: 2013-05-14

Total Pages: 0

ISBN-13: 9781468416688

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Among the different types of receptors for neurotransmitters, nicotinic acetyl choline receptors were the first to be studied systematically; at present they are very well characterized. This is due to the discovery of two very convenient objects that are endowed with nicotinic acetylcholine receptors - the skeletal muscle and the electric organ. The large size of skeletal muscle fibers, which simplifies the intra cellular recording of transmembrane potentials and currents, played a crucial role in obtaining the fIrst quantitative estimates of the activity of acetylcholine receptors and the kinetics of their interaction with ligands. On the other hand, the extremely high content of receptor protein in the electric organ tissue - two orders higher than in muscle tissue - rendered it highly suitable for studying the biochemistry of recep tors. The combination of pharmacological, electrophysiological, and biochemical approaches resulted in rapid progress in the investigation of acetylcholine receptors. Nicotinic acetylcholine receptors are also present in the neurons of autonomic ganglia, in the central nervous system of vertebrates, and in the ganglion neurons of invertebrates. Although each of these three types of receptors has its own pharma cological specificity, some of their properties are common and differ from those in the acetylcholine receptors of skeletal muscle and electric organ. One of these differences is that neuronal nicotinic receptors usually coexist in the same nerve cell with other receptors, e. g. , muscarinic, serotoninergic, or peptidergic.


Nicotinic Receptors in the Nervous System

Nicotinic Receptors in the Nervous System

Author: Edward D. Levin

Publisher: CRC Press

Published: 2001-08-29

Total Pages: 310

ISBN-13: 1420038524

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Featuring a unique approach, Nicotinic Receptors in the Nervous System provides integrated coverage of research on neuronal nicotinic systems relevant to smoking addiction and cognitive dysfunction. By bringing together molecular and neurochemical applications, the book provides the key to understanding function and dysfunction of nicotinic systems and how they are significant for disease, addiction, and the development of novel drug treatments. The book presents readers with the basic mechanistic background for these treatments as well as the functional assessment necessary to determine therapeutic effects.


Neuronal Nicotinic Receptors

Neuronal Nicotinic Receptors

Author: F. Clementi

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 837

ISBN-13: 3642570798

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Neuronal nicotinic receptors are key molecules for signal transduction in a number of neuronal pathways. They are widely distributed in the brain and are known to be involved in cognitive tasks, including learning and memory, in smoking addiction and in several brain diseases, such as Alzheimer's and Parkinson's dementias, schizophrenia, and epilepsy. This book provides a comprehensive review of the field, starting with a historical perspective and dealing with the molecular structure of these receptors, their biophysical and pharmacological properties, their distribution in central and peripheral nervous systems, and their major involvement in brain functions. Particular emphasis is paid to drugs (both new and old) that are useful in the diagnosis and treatment of diseases involving neuronal nicotinic receptors. Finally, the relevance of these receptors in smoking addiction is carefully evaluated, together with future trends and the latest results.


The Brain as a Chemical Machine

The Brain as a Chemical Machine

Author: Jean-Pierre Changeux

Publisher: Odile Jacob

Published: 2005-04-01

Total Pages: 299

ISBN-13: 2738179487

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The purpose of this book is to give a clear and straightforward account of the remarkable properties of the nicotinic receptor for acetylcholine, a membrane protein involved in chemical transduction in the nervous system that is also the target of a widely used drug, nicotine. This molecule also happens to be the first pharmacological receptor and ion channel ever to have been identified. Jean-Pierre Changeux has played a leading role with Stuart J. Edelstein in the investigation of nicotinic acetylcholine receptors and allosteric proteins. The aim of this book is not only to review the most recent experimental and theoretical breakthroughs in the study of the nicotinic receptor, but also to give the reader a sense of the intellectual excitement and adventure that accompanied the various stages of discovery. This richly illustrated volume furnishes an exceptional opportunity for scientists and students to follow the course of a major advance in our understanding of the molecular basis of brain functions. Jean-Pierre Changeux is honorary professor at the Collège de France and at the Institut Pasteur, a member of the French Academy of Sciences. In addition to L’Homme neuronal [Neuronal Man] he is the author of Raison et Plaisir and L’Homme de vérité. He is also co-author, with Alain Connes, of Matière à penser [Conversations on Mind, Matter, and Mathematics] and, with Paul Ricœur, of La Nature et la Règle [What Makes Us Think?]. All thought-provoking works. Stuart J. Edelstein is Professor of Biochemistry at the University of Geneva and a foreign associate member of the Academy of Sciences. "The nicotinic acetylcholine receptor has served for many decades as the prototype for neurotransmitter receptors. Acetylcholine was the first neurotransmitter shown to be involved in the fonction of the mammalian brain and its nicotinic receptor the first receptor to be characterized. Jean-Pierre Changeux is the indisputable pioneer in this field. This volume summarizes with great lucidity the history of a highly important topic in neuroscience." Paul Greengard, Nobel laureate in Medecine - The Rockefeller University "From the molecule to thought itself - an extraordinary journey! Changeux and Edelstein are uniquely qualified to relate this utterly fascinating story, whose philosophical implications are no less important than the scientific research underlying them." Jean-Marie Lehn, Nobel laureate in Chemistry - ISIS-Université Louis Pasteur, Strasbourg "The human brain is as much a chemical as an electrical network. Its intricacy and sophistication set it apart from any known technical device. The groundbreaking papers by Monod, Jacob, Wyman, and Changeux in the 1960s on chemical regulation and control were eye-opening for all us who were doing experimental research in ths field, and they have turned out to be crucial for understanding biological evolution and learning in a broad sense. Since then Changeux and Edelstein have achieved international fame for their work on nicotinic acetylcholine receptors, amply documented in this masterful account." Manfred Eigen, Nobel laureate in Chemistry - Max Planck Institute for Biophysical Chemistry, Göttingen "One hesitates to call this book a monograph, for despite its comprehensive treatment of a complex subject it is not meant solely for specialized readers. In concentrating on a single class of neuroreceptors, the nicotinic acetylcholine receptor, it seeks to draw out general principles which apply more widely. It will therefore be welcomed not only by serious workers and students in the field of neurobiology, but also by anyone interested in the broader field of neuroscience." Sir Aaron Klug OM FRS, Nobel laureate in Chemistry - University of Cambridge "Changeux and Edelstein have provided a concise yet highly comprehensive account of perhaps the prototypical neurotransmitter complex, the nicotinic acetylcholine receptor. The story of how the roles played by this signal transduction system in nicotine dependence, learning, memory, and the processes of cognition came to be unraveled is an exciting saga, both beautiful and profound. A lovely historico-scientific document." Floyd E. Bloom, Professor Emeritus - The Scripps Research Institute "Changeux and Edelstein describe a classically Cartesian process of scientific investigation that leads to a most non-Cartesian conclusion. Having elucidated the mechanisms of action and interaction by which the various elements that make up the nicotinic acetylcholine receptor operate throughout the nervous system, from neuromuscular junctions to the brain itself, the authors turn to the role of thse structures and mechanisms in supporting cognition and giving access to consciousness - thus parting ways with Descartes and the view that the mind is able somehow to exist independently of the body. A work of truly remarkable erudition and insight." Roger Guillemin, Nobel laureate in Medicine - Salk Institute for Biological Studies “This book is unlike any recent scientific book. It is more like a forty-year research meeting in one of the world’s most creative neurobiology laboratories—an intellectual tour de fortcheat surveys the developmental trends and achievements of twentieth-century neuroscience in molecular, structural, and functional terms. The book therefore becomes an extraordinary educational saga, moving from Sir Henry Dale’s pharmacology of nicotine to genetic diseases involving mutations of the cation channel function of nicotinic acetylcholine receptors. Research into these archetypal proteins has been carried out by pharmacologists, biochemists, molecular biologists, electrophysiologists, behavioral scientists, and geneticists, with Jean-Pierre Changeux and his coworkers participating in every aspect of this remarkable inquiry. Nicotinic acetylcholine receptors are the workhorse of the fast actions of the chemical signal acetylcholine, abundantly transmitted in both the peripheral and the central nervous system. Thanks to their variable sub- unit composition they come in many flavors, mediating control of voluntary muscles in the periphery and helping to regulate reward functions, cognition, and memory in the brain. This rich functionality leads the authors to describe models of neuromuscular junction development as well a global workspace model of cognitive function and its role in effortful learning. The nicotinic acetylcholine receptor was among the first ligand-gated ion channels to be sequenced and studied by patch-clamp methods. It has been the object of neurobiological research in England, France, Germany, Japan, and the United States, with contributions of equal weight being made by many teams of researchers over a number of decades, all carefully chronicled and explained by the authors. This book is to be highly recommended to young scientists who want to discover into how many fields a single protein molecule can take them—from snake venom action to myasthenia gravis, addiction, learning, and schiz- ophrenia—if they are willing patiently to learn new research techniques rather than specialize in a single method or instrument. To investigate the nicotinic acetylcholine receptor in all its aspects requires a Renaissance mind, and it is exactly this that Changeux and Edelstein have brought to bear on one of the most studied topics in neuroscience of the last century.” TAMAS BARTFAI, Chair and Professor, Department of Neuropharmacology The Scripps Research Institute