Cellular Mechanisms Mediating The Actions Of Nerve Growth Factor In Sensory Neurons
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Author | : |
Publisher | : |
Total Pages | : 410 |
Release | : 2007 |
Genre | : Calcitonin gene-related peptide |
ISBN | : |
Nerve growth factor (NGF) is a neurotrophin upregulated with injury and inflammation. Peripheral administration of NGF causes hyperalgesia and allodynia in animals. Blocking NGF signaling reverses these effects. At the cellular level, chronic exposure of sensory neurons to NGF enhances expression the neurotransmitter, calcitonin gene-related peptide (CGRP). Acute exposure to NGF increases capsaicin-evoked CGRP release from sensory neurons in culture. Thus, NGF increases peptide release from neurons by: (1) increasing expression of peptides, and/or (2) altering their sensitivity. The increase in peptide outflow by either mechanism could contribute to development of hyperalgesia and allodynia. The signaling cascades mediating the actions of NGF in sensory neurons are unclear. Therefore, experiments were designed to determine which pathways regulate changes in iCGRP content and evoked release from primary sensory neurons in culture. The Ras/MEK/ERK cascade was identified as a possible regulator of iCGRP expression in response to NGF. To test this pathway, it was manipulated in neurons by (1) expression of dominant negative or constitutively active isoforms of Ras, (2) farnesyltransferase inhibition, (3) manipulation of the RasGAP, synGAP, and (4) blocking MEK activity. When the pathway was blocked, the NGF-induced increase in iCGRP expression was attenuated. When the Ras pathway was activated, iCGRP expression increased. These data indicate that Ras, and downstream signaling kinases, MEK and ERK, regulate the NGF-induced increases in CGRP in sensory neurons. To determine which pathway(s) regulate the increase in capsaicin-evoked iCGRP release upon brief exposure to NGF, the Ras/MEK/ERK pathway was manipulated as described above, and pharmacological inhibitors of the PI3 kinase, PLC, and Src kinase pathways were used. There were no differences observed in NGF-sensitization when the Ras and PI3 kinase pathways were inhibited, suggesting these two pathways were not involved. However, when the Src kinase inhibitor PP2 was used, the NGF-induced increase in release was completely blocked. Furthermore, the PKC inhibitor, BIM, also inhibited the sensitization by NGF. This data indicate Src and PKC regulate of sensitivity of sensory neurons in response to brief exposure to NGF. Thus, there is differential regulation of iCGRP content and evoked release from sensory neurons in response to NGF.
Author | : C. Bell |
Publisher | : Elsevier |
Total Pages | : 551 |
Release | : 1996-12-17 |
Genre | : Medical |
ISBN | : 0080529038 |
This volume provides an up-to-date survey of current thinking concerning the actions of chemical factors in the regulation of neuronal behaviour under normal and pathological conditions. The book is divided into four sections, dealing with chemical factors involved with the formation of axon pathways, factors involved with neuronal survival and specialization during normal development, factors involved in normal maintenance and repair of adult neurons and, finally, factors that have been implicated as mediators of degenerative changes in neurological and neuropsychiatric disorders.
Author | : George J. Siegel |
Publisher | : Lippincott Raven |
Total Pages | : 1216 |
Release | : 1999 |
Genre | : Medical |
ISBN | : |
Illustrations by Lorie M. Gavulic, MFA Sponsored by the American Society for Neurochemistry.
Author | : W. G. Hopkins |
Publisher | : CUP Archive |
Total Pages | : 156 |
Release | : 1984-03 |
Genre | : Medical |
ISBN | : 9780521253444 |
Author | : Kwok-Fai So |
Publisher | : Academic Press |
Total Pages | : 0 |
Release | : 2015-02-06 |
Genre | : Science |
ISBN | : 9780128017326 |
Neural Regeneration provides an overview of cutting-edge knowledge on a broad spectrum of neural regeneration, including: Neural regeneration in lower vertebrates Neural regeneration in the peripheral nervous system Neural regeneration in the central nervous system Transplantation-mediated neural regeneration Clinical and translational research on neural regeneration The contributors to this book are experts in their fields and work at distinguished institutions in the United States, Canada, Australia, and China. Nervous system injuries, including peripheral nerve injuries, brain and spinal cord injuries, and stroke affect millions of people worldwide every year. As a result of this high incidence of neurological injuries, neural regeneration and repair is becoming a rapidly growing field dedicated to the new discoveries to promote structural and functional recoveries based on neural regeneration. The ultimate goal is to translate the most optimal regenerative strategies to treatments of human nervous system injuries. This valuable reference book is useful for students, postdoctors, and basic and clinical scientists who are interested in neural regeneration research.
Author | : Rita Levi-Montalcini |
Publisher | : World Scientific |
Total Pages | : 502 |
Release | : 1997 |
Genre | : Science |
ISBN | : 9810226047 |
This volume is a collection of articles written by Nobel Laureate Rita Levi-Montalcini and published from 1942 to 1995. Studies described in the first part set the stage for the discovery of a protein molecule which became known as the Nerve Growth Factor (NGF), described in detail in the second part. The NGF synthesized in minute amounts in all vertebrate tissues, plays an essential role in the differentiation and survival of several nerve cell populations in the peripheral and central nervous system. The discovery of the NGF was defined by the Nobel Foundation as a milestone in developmental neurobiology, and the author was awarded in 1986 with this prestigious award. Studies pursued in subsequent years and still in progress, have unveiled other fundamental properties of the NGF, described in the third part of this volume.
Author | : Bruce Alberts |
Publisher | : |
Total Pages | : 0 |
Release | : 2002 |
Genre | : Cytology |
ISBN | : 9780815332183 |
Author | : Lawrence Kruger |
Publisher | : CRC Press |
Total Pages | : 458 |
Release | : 2009-11-24 |
Genre | : Health & Fitness |
ISBN | : 1439812101 |
One of the Most Rapidly Advancing Fields in Modern Neuroscience The success of molecular biology and the new tools derived from molecular genetics have revolutionized pain research and its translation to therapeutic effectiveness. Bringing together recent advances in modern neuroscience regarding genetic studies in mice and humans and the practical
Author | : E. Carstens |
Publisher | : CRC Press |
Total Pages | : 482 |
Release | : 2014-02-25 |
Genre | : Science |
ISBN | : 1466505435 |
Advances in itch research have elucidated differences between itch and pain but have also blurred the distinction between them. There is a long debate about how somatic sensations including touch, pain, itch, and temperature sensitivity are encoded by the nervous system. Research suggests that each sensory modality is processed along a fixed, direct-line communication system from the skin to the brain. Itch: Mechanisms and Treatment presents a timely update on all aspects of itch research and the clinical treatment of itch that accompanies many dermatological conditions including psoriasis, neuropathic itch, cutaneous t-cells lymphomas, and systemic diseases such as kidney and liver disease and cancer. Composed of contributions from distinguished researchers around the world, the book explores topics such as: Neuropathic itch Peripheral neuronal mechanism of itch The role of PAR-2 in neuroimmune communication and itch Mrgprs as itch receptors The role of interleukin-31 and oncostatin M in itch and neuroimmune communication Spinal coding of itch and pain Spinal microcircuits and the regulation of itch Examining new findings on cellular and molecular mechanisms, the book is a compendium of the most current research on itch, its prevalence in society, and the problems associated with treatment.
Author | : Istvan Berczi |
Publisher | : Elsevier |
Total Pages | : 285 |
Release | : 2010-05-27 |
Genre | : Science |
ISBN | : 0123846927 |
New Insights to Neuroimmune Biology investigates the mechanisms that and functions of the Neuroimmune Regulatory Supersystem. Covering molecular regulation of cytokines in brain astrocytes, immunoregulation by the sympathetic nervous system, circadian regulation of immune reactions, antigen recognition by the CNS, the modulation of the immune response by head injury, neurogenic inflammation, the role of tachykinins in asthma and allergic disease, defence and defeat reactions, cytokines, behavior and affective disorders, increased activity of type 1 helper T cell functions after reward stimulation. This book has relevance to the entire scientific community in Biology, Medicine and Veterinary medicine as it discusses molecular, cellular, organic and systemic aspects as well as the physological, pathophysiological and behavioral mechnisms which are involved in Neuroimmiune Biology.