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  • 1
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (6 Seiten, 1,89 MB)
    Language: German
    Note: Förderkennzeichen BMBF 01GQ1001E. - Verbund-Nummer 01077682 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Zusammenfassungen in deutscher und englischer Sprache
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  • 2
    Online Resource
    Online Resource
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Keywords: Neurophysiology. ; Electronic books.
    Description / Table of Contents: In this critical review of the role of neurotrophins and their receptors in pathologies ranging from Huntington's syndrome to clinical depression, contributing authors cover the latest advances in the field, including drugs that manipulate neurotrophin signaling.
    Type of Medium: Online Resource
    Pages: 1 online resource (514 pages)
    Edition: 1st ed.
    ISBN: 9783642451065
    Series Statement: Handbook of Experimental Pharmacology Series ; v.220
    DDC: 573.8536
    Language: English
    Note: Intro -- Preface -- Contents -- Part I: The Neurotrophin Family -- NGF, BDNF, NT3, and NT4 -- 1 Historical Background: Discovery of NGF and Other Neurotrophins -- 1.1 Discovery of NGF -- 1.2 Discovery of the Neurotrophin Gene Family -- 2 Neurotrophin Structure -- 3 Neurotrophin Receptors -- 4 Neurotrophin Processing and Secretion -- 5 Differential Activity of Neurotrophins and Proneurotrophins -- 6 Evolution of Neurotrophins -- 6.1 Invertebrate Origins of Neurotrophins -- 6.2 Evolutionary Adaptations of NGF -- 6.2.1 Mouse Saliva NGF -- 6.2.2 NGF as a Noxious Component of Venoms -- 6.2.3 Fowlpox NGF -- References -- Deciphering Proneurotrophin Actions -- 1 Actions in ProNGF in Development -- 2 ProNGF in Aging -- 3 ProNGF Actions Following Injury -- 3.1 ProNGF Actions in Non-neuronal Organ Systems -- 4 Acute Proneurotrophin Actions on Neuronal Morphology -- 5 ProBDNF Effects on Synaptic Plasticity -- 6 ProBDNF in Disease States -- 7 Other Proneurotrophins: ProNT-3 and ProNT-4 -- 8 Regulation of Conversion of Proneurotrophins to Mature Neurotrophins -- 9 Extracellular Cleavage of Proneurotrophins -- 10 Molecular Strategies to Alter ProNGF Effects -- References -- Spatiotemporal Intracellular Dynamics of Neurotrophin and Its Receptors. Implications for Neurotrophin Signaling and Neuronal ... -- 1 Secretion and Anterograde Transport of Neurotrophins and Their Receptors -- 1.1 Neurotrophin Discovery and Biological Sources -- 1.2 Coordination of Neurotrophin Processing, Local Translation, and Postsynaptic Secretion -- 1.3 Anterograde Transport of Neurotrophin and Its Receptors -- 2 Internalization and Retrograde Signaling of Neurotrophin Receptors -- 2.1 Trks Internalization and Intracellular Trafficking -- 2.2 p75 Internalization and Intracellular Trafficking -- 2.3 Neurotrophin Trafficking and Neurodegenerative Diseases. , 2.4 Mechanism of the Axonal Transport of Neurotrophin Signaling in Neurons -- 2.5 Retrograde Signaling and the Development of Proper Connectivity -- References -- Neurotrophins: Transcription and Translation -- 1 Introduction -- 2 Nerve Growth Factor -- 2.1 Expression Pattern and Regulation -- 2.2 Promoter Structure and Elements -- 2.3 Regulation of mRNA Stability -- 3 Neurotrophin-3 -- 3.1 Expression Pattern and Regulation -- 3.2 Promoter Structure and Elements -- 4 Neurotrophin-4 -- 4.1 Expression Pattern and Regulation -- 4.2 Promoter Structure and Elements -- 5 Brain-Derived Neurotrophic Factor -- 5.1 Expression Pattern and Regulation -- 5.2 Promoter Structure -- 5.3 Promoter Regulation -- 5.3.1 Promoter I -- 5.3.2 Promoter II -- 5.3.3 Promoter IV -- 5.4 Chromatin Regulation -- 5.4.1 Posttranslational Histone Modifications -- 5.4.2 DNA Methylation -- 5.5 Translational Regulation -- 5.5.1 MicroRNAs Targeting the Bdnf 3-UTR -- 5.5.2 Natural Antisense BDNF Transcripts -- 5.5.3 Dendritic Trafficking of Bdnf mRNA -- References -- Part II: Neurotrophin Receptors -- Trk Receptors -- 1 Introduction -- 2 Structure -- 3 Ligands -- 4 Signaling -- 4.1 PLC-gamma -- 4.2 PI3K-Akt -- 4.3 Erk -- 5 Alternatives to Ligand Binding: Transactivation of Trk Receptors -- 6 Membrane Trafficking -- 6.1 Receptor Recycling and Degradation -- 6.2 Retrograde Axonal Transport -- 7 Effects of Trk Signaling on the Nervous System -- 7.1 Neuronal Survival -- 7.2 Morphological Effects -- 7.3 Synaptic Plasticity -- 8 Truncated Trk Receptors -- 9 Trk Signaling in Disease -- References -- The Biological Functions and Signaling Mechanisms of the p75 Neurotrophin Receptor -- 1 Introduction -- 2 Structure -- 3 Apoptotic Signaling -- 3.1 Activation of the Mitochondrial Cascade -- 3.2 Cytosolic Factors Linking p75NTR to JNK -- 3.3 Other Factors Involved in p75NTR Mediated Apoptosis. , 3.4 Regulated Intramembrane Proteolysis of p75NTR -- 3.5 Proneurotrophins and Sortilin -- 3.6 Apoptotic Role of p75NTR in Pathology -- 4 Promotion of Cell Survival -- 4.1 P75NTR Interactions with the Trks -- 4.2 P75NTR Activation of NFkappaB -- 5 Regulation of the Cell Cycle -- 6 Regulation of Synaptic Plasticity -- 7 Promotion of Peripheral Myelination -- 8 Regulation of Neurite Growth and Axonal Degeneration -- References -- Sortilins in Neurotrophic Factor Signaling -- 1 The Vps10p Domain Receptor Family: Sortilins -- 2 The Vps10p Domain Structure -- 3 Ligands of Sortilins -- 4 Processing Conditions Sortilin and SorLA for Ligand Binding -- 5 Cellular Trafficking of Sortilins -- 6 Sortilin in Proneurotrophin-Induced Apoptosis -- 7 Sortilins and Proneurotrophin Signaling -- 8 Potentiation of Neurotrophic Factor Signaling by Sortilins -- 9 Sortilins and Neuronal Disease -- 10 The Role of Sortilins in Metabolic Disorders -- References -- Part III: The Biology of Neurotrophins -- Neurotrophins in the Regulation of Cellular Survival and Death -- 1 Introduction -- 2 Neurotrophins Promote the Survival of Neurons Through Trk Receptors -- 2.1 Neurotrophins and the Trk Receptors Support Survival of Developing Peripheral Neurons -- 2.2 Neurotrophins and Central Neuron Survival -- 2.3 BDNF May Act as a Survival Factor After Injury -- 2.4 Trk Signaling Promotes Survival -- 2.5 Retrograde Survival Signaling -- 3 Promotion of Survival by the P75NTR -- 3.1 Genetic Evidence -- 3.2 Prosurvival Signaling Pathways Activated by p75NTR -- 4 Promotion of Cell Death by the p75NTR -- 4.1 p75NTR and Cell Death: Evidence from Genetic Data -- 4.2 p75NTR and Cell Death: Signaling -- 4.3 p75NTR and Cell Death: Role of pro-NGF -- 5 The Emergence of the Trk Receptors as Death Receptors -- 5.1 Trk Receptors Can Induce Death of Tumor Cells. , 5.2 Trk Receptors in the Death of Neurons -- References -- BDNF and Synaptic Plasticity, Cognitive Function, and Dysfunction -- 1 BDNF Regulation of Early Phase-LTP -- 1.1 Initial Discovery -- 1.2 Acute Versus Chronic Synaptic Modulation by BDNF -- 1.3 Activity-Dependent Secretion of BDNF and Its Role in Synapse Plasticity and Memory -- 1.4 Effect of tDCS on LTP and Motor Learning -- 1.5 Role of TrkB Trafficking -- 2 BDNF Regulation of Late Phase-LTP and Long-Term Memory -- 2.1 proBDNF Cleavage by tPA/Plasmin System Regulates Late Phase-LTP -- 2.2 BDNF Regulation of Long-Term Memory -- 2.3 BDNF-TrkB Signaling in Synaptic and Behavior Tagging -- 2.4 Role of Untranslated Region (UTR) of BDNF mRNA -- 3 BDNF Regulation of Long-Term Depression -- 3.1 proBDNF Effect on LTD -- 3.2 Opposing Effects of proBDNF and Mature BDNF: Yin-Yang Hypothesis -- 3.3 Role of p75 and LTD in Stress Coping and Anxiety -- 4 BDNF Regulation of GABAergic Network -- 4.1 Activity-Dependent Transcription and GABAergic Interneurons -- 4.2 BDNF-TrkB Controls Network Oscillations Through Regulation of PV Interneurons -- References -- Nerve Growth Factor and Nociception: From Experimental Embryology to New Analgesic Therapy -- 1 Introduction -- 2 Experimental Embryology Leads the Way -- 3 NGF and Hyperalgesia: The Linchpin Theory 1993 -- 4 NGF-Dependent Heat Hyperalgesia: Molecular Mechanisms -- 5 Mechanisms of NGF-Dependent Mechanical Hyperalgesia -- 6 Cell Biology of Long-Lasting Sensitization Induced by NGF -- 7 The NGF Nexus of Pain -- References -- Neurotrophins and the Regulation of Energy Balance and Body Weight -- 1 Introduction -- 2 Brain Circuits Regulating Feeding Behavior -- 3 BDNF -- 4 NGF, NT-3, and NT-4 -- 5 CNTF -- 6 GDNF -- 7 Summary -- References -- The Biology of Neurotrophins: Cardiovascular Function -- 1 Introduction. , 2 Neurotrophins and Cardiovascular Development -- 3 Neurotrophins and the Development of Neurons Involved in Cardiovascular Control -- 4 Neurotrophins in Adult Cardiovascular Physiology and Pathophysiology -- 5 Neurotrophin Regulation of Angiogenesis -- 5.1 Hindlimb Ischemia -- 5.2 Diabetes -- 5.3 Myocardial Ischemia -- 5.4 Heart Failure -- 5.5 Atherosclerosis -- 6 Neurotrophin Regulation of Nerves Involved in Cardiovascular Function -- 6.1 Myocardial Ischemia and Congestive Heart Failure -- 6.2 Diabetes -- 6.3 Hypertension -- 7 Summary -- References -- Neurotrophin Signalling and Transcription Programmes Interactions in the Development of Somatosensory Neurons -- 1 Introduction -- 2 Neurotrophin-Trk Signalling and Functional Sub-classes of Somatosensory Neurons (Fig.1) -- 3 Early Effects of Neurotrophins -- 3.1 Proliferation and Cell Cycle Exit -- 3.2 From Dividing Neuronal Progenitors to Post-mitotic Sensory Neurons -- 4 Transcription Programmes in the Development of Somatosensory Neurons (Fig.2) -- 4.1 Retrograde Control of Transcription Factor Expression by Neurotrophin Signalling -- References -- Part IV: Neurotrophins in Pathological Conditions -- Huntington´s Disease -- 1 Introduction -- 2 Wild-Type Huntingtin and BDNF Gene Transcription -- 2.1 In Vitro and In Vivo Evidence of a Link Between Wild-Type Huntingtin and BDNF -- 2.2 The Involvement of REST/NRSF in Huntingtin´s Activity in the CNS -- 2.3 Beyond BDNF: An Expanded Role for Wild-Type Huntingtin in Neuronal Gene Transcription -- 3 Reduced BDNF Gene Transcription in HD -- 3.1 Evidence from HD Cell and Animal Models -- 3.2 Reduced BDNF Promoter II Activity in HD -- 3.3 A Gained Toxic Activity of Mutant Huntingtin on BDNF Promoter IV and VI -- 4 Huntingtin and BDNF Vesicles Transport -- 4.1 Huntingtin as a Scaffolding Protein That Drives BDNF Vesicles Transport. , 4.2 The Impact of the HD Mutation on BDNF Vesicles Transport.
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  • 3
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Electrical stimulation of cutaneous nerve Aδ-fibres can lead to increases in skin blood flow (Jänig and Lisney, J. Physiol. (Lond.), 415, 477–486, 1989). Here we have examined this phenomenon in adult rats treated neonatally with antisera to nerve growth factor between postnatal days 2 and 14. This treatment forces many Aδ nociceptor afferents to take on the phenotype of low-threshold D-hair afferents (Lewin et al., J. Neurosci., 12, 1896–1905, 1992). In animals treated this way we found a parallel decrease in the ability of Aδ-fibres to increase skin blood flow. The increase in blood flow evoked by C-fibre stimulation was also reduced, but no change was seen in the ability of C-fibres to elicit neurogenic extravasation in skin. These data may be taken as evidence that in rats, amongst the cutaneous Aδ-fibres, nociceptor but not D-hair afferents are capable of producing blood flow changes in the skin.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    European journal of neuroscience 4 (1992), S. 0 
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: During development, nerve growth factor (NGF) regulates the density and character of peripheral target innervation (Barde, Neuron, 2, 1525–1534, 1989; Ritter et al., Soc. Neurosci. Abstr., 17, 546.2, 1991); its role in adult animals is less well defined. Here we have asked if the availability of growth factors such as NGF in peripheral tissues can influence the pattern of primary afferent connections in the CNS. Using osmotic minipumps, we raised the levels of NGF in rat skeletal muscle in vivo, a tissue where the levels of this factor are normally very low (Korsching and Thoenen, Proc. Natl. Acad. Sci. USA, 80, 3513–3516, 1983; Shelton and Reichardt, Proc. Natl. Acad. Sci. USA, 81, 7951–7955, 1984; Goedert et al., Mol. Brain Res., 1, 85–92, 1986). After 2 weeks of treatment we asked if the sensory neurons innervating this tissue showed an altered strength and distribution of connections with dorsal horn neurons. The contralateral (vehicle-treated) muscle, and totally untreated animals, served as controls. In normal and vehicle-treated animals, electrical stimulation of muscle afferents excited relatively few neurons in the dorsal horn, and these generally showed only weak responses. In contrast, on the NGF-treated side many more dorsal horn neurons in the lumbar enlargement of the spinal cord were excited by muscle afferents. The increased responsiveness could not be explained by a generalized increase in dorsal horn excitability, since spontaneous activity was not enhanced, nor by a change in A-fibre-mediated inhibitions from the treated afferents. Thus, these afferents appeared to establish new synaptic connections or strengthened previously weak ones as a result of increased neurotrophic factor availability. The data suggest that, in the adult rat, the levels of growth factors in peripheral targets may be used to regulate an appropriate degree of afferent connectivity within the central nervous system.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    European journal of neuroscience 11 (1999), S. 0 
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Sensory neurons of the dorsal root ganglia (DRG) regenerate their peripheral axons with relative ease following a nerve lesion. The capacity for central regeneration appears more limited. However, after nerve lesion, some DRG neurons gain a regenerative advantage to sprout centrally. We developed a lesion model in the rat to test whether, after prior lesion of their peripheral axons, subsets of cutaneous afferents benefit differently in their ability to sprout into adjacent spinal segments denervated by dorsal rhizotomy. We found that under identical circumstances, myelinated sensory neurons, small-diameter peptidergic sensory neurons containing calcitonin gene related peptide (CGRP), and small-diameter nonpeptidergic neurons that bind the lectin from the plant Griffonia simplificolia, isolectin B4 (IB4) differ dramatically in their ability to regenerate centrally. Myelinated afferent terminals labelled transganglionically with cholera-toxin β-subunit gain a small advantage in collaterally sprouting into the adjacent denervated neuropil in lamina III after prior peripheral nerve lesion. This central regenerative response was not mimicked by experimentally induced inflammation of sensory neuron cell bodies. Intact and unlesioned sensory neurons positive for CGRP sprout vigorously into segments denervated by rhizotomy in a nonsomatotopic manner. In contrast, IB4-positive sensory neurons maintain a somatotopic distribution centrally, which is not altered by prior nerve lesion. These data reveal a remarkably heterogeneous response to regeneration-promoting stimuli amongst three different types of cutaneous sensory neurons. In particular, the divergent responses of peptidergic and nonpeptidergic sensory neurons suggests profound functional differences between these neurochemically distinct neurons.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    European journal of neuroscience 5 (1993), S. 0 
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We have studied the somatotopic reorganization in dorsal horn neurons after a disruption in the normal spatial arrangement of primary sensory axons in adult rats. Muscle afferents were redirected to skin by cutting and cross-anastomosing the hindlimb gastrocnemius nerve (GN) and sural nerve (SN). It has previously been shown that after 10 – 12 weeks GN afferents innervate the hairy skin of the lateral ankle and calf (previously innervated by SN afferents) and become potentially capable of relaying information on the location and intensity of stimuli applied to the skin. We determined the receptive field and response properties of dorsal horn neurons in the lumbar spinal cord, in regions where the lower hindlimb is normally represented. In control animals (with intact or self-anastomosed sural nerves) very few neurons (〈8%) received any synaptic input from the GN as assessed by electrical stimulation of the nerve. In contrast, when this nerve innervated skin, many cells responded to GN stimulation, and these nearly all had receptive field components in the former SN territory. Moreover, in animals with cross-anastomosed nerves, cells without GN inputs all had receptive fields outside the former SN skin territory. We have shown that in all likelihood GN afferents substituted for SN afferents in subserving the low and high threshold receptive fields of dorsal horn neurons. Furthermore, for many neurons, receptive fields were formed from inappropriately regrown GN afferents and adjacent intact cutaneous afferents (in the tibial or common peroneal nerves). Therefore, when GN afferents innervate skin in adult animals, they alter their central connectivity in an appropriate manner for their new peripheral terminations, so that an orderly somatotopic representation of the hind limb skin is maintained. We suggest that this plasticity of dorsal horn somatotopy is driven in part by activity-dependent mechanisms.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    European journal of neuroscience 3 (1991), S. 0 
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Some properties of primary sensory neurons change when they reinnervate new peripheral targets (McMahon et al., Neuroscience, 33, 67–75, 1989). We ask here if such influences can extend to the central connectivity of sensory neurons. In adult rats the nerve to the gastrocnemius muscle (GN) and the cutaneous sural nerve (SN) were self- and cross-anastomosed on left- and right-hand sides, respectively, so that they regenerated to either appropriate or inappropriate targets. Ten to 14 weeks later, the distribution and strength of spinal connections of the SN and GN were determined. The unmyelinated afferents in the GN innervating skin increased their connectivity to 286% of that seen for the GN innervating muscle (P 〈 0.005), and came to resemble normal cutaneous afferents. However, for the SN there was no significant difference between appropriately and inappropriately regenerated nerves by this measure. The ability of myelinated fibres to produce inhibitions and facilitations in dorsal horn cells was also assessed. The intact or self-anastomosed SN produced predominantly inhibitory effects, whilst the GN produced predominantly facilitatory effects. After the SN had regenerated to muscle its central effects became predominantly facilitatory, whilst those of the GN innervating skin became inhibitory. These changes were statistically significant. In conclusion, we have found that major changes in the physiology of central connections in the dorsal horn may occur following peripheral reinnervation of foreign targets. The changes that were seen were appropriate to the new target, and could not easily be explained by non-specific changes due to axotomy, or changes in A-fibre-mediated inhibitions. We suggest that these effects might arise because of trophic influences arising in and specific to different peripheral targets.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Besides their recognized dependence on nerve growth factor (NGF) during development, the dependence of mature sympathetic ganglion neurons on other neurotrophins is still unclear. Here, we have investigated the sympathetic innervation of back skin in mice overexpressing brain-derived neurotrophic factor (BDNF) under the alpha-myosin heavy-chain promoter, as well as in BDNF knockout (–/–) mice. Compared with wild-type controls, the dorsal skin of BDNF overexpressing mice displayed a significantly enhanced number of adrenergic, tyrosine hydroxylase-immunoreactive (IR) nerve fibres, while cholinergic or peptidergic sensory nerve fibres appeared unaltered. The adrenergic hyperinnervation in dorsal skin of BDNF overexpressing mice was most pronounced in the arrector pili muscle of hair follicles, while no increase of tyrosine hydroxylase-or neuropeptide Y-IR fibres associated with subcutaneous blood vessels was found. Instead, back skin of BDNF knockout (–/–) mice contained significantly fewer tyrosine hydroxylase-IR dermal nerve fibres than wild-type animals. This suggests that BDNF plays an important role in the control of different subsets of adrenergic innervation in murine back skin, and indicates that paravertebral sympathetic ganglia display a previously unrecognized differential BDNF-dependence in vivo.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    European journal of neuroscience 6 (1994), S. 0 
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Mechanisms underlying the hyperalgesia induced by a single systemic injection of nerve growth factor (NGF) in adult rats were studied in vivo. A single dose of NGF initiated a prolonged thermal hyperalgesia to a radiant heat source within minutes that lasted for days. Animals which had been pretreated with the mast cell degranulating compound 48/80 or either one of two specific 5-hydroxytryptamine receptor antagonists (ICS 205–930 and methiothepin) also developed an NGF-induced thermal hyperalgesia, but onset was delayed by more than 3 h. In the presence of ICS 205-930 or methiothepin the early component NGF-induced hyperalgesia was reversed and the animals responded with an initial hypoalgesia to the thermal stimuli. Whereas these results indicate a peripheral mechanism for the initial thermal hyperalgesia, the later phase (7 h–4 days after NGF) appeared to be centrally maintained, since it could be selectively blocked by the non-competitive NMDA receptor antagonist MK-801. In contrast to the almost immediate thermal hyperalgesia following a single injection of NGF, a significant mechanical hyperalgesia began only after a 7 h latency. This NGF-induced mechanical hyperalgesia was not blocked by any of the treatments that attenuated the thermal hyperalgesia, indicating that a separate mechanism may be involved. Additional electrophysiological experiments showed that NGF-induced hyperalgesia was not maintained by an increased amount of spontaneous activity in C-fibres. A final result showed that endogenous release of NGF in a model of acute inflammation (complete Freund's adjuvant-induced inflammation) may be involved in the development of thermal hyperalgesia, since it could be blocked by concomitant treatment with anti-NGF antisera. These data indicate that NGF-induced thermal and mechanical hyperalgesia are mediated by different mechanisms. The rapid onset component of thermal hyperalgesia is due to a peripheral mechanism involving the degranulation of mast cells, whereas the late component involves central NMDA receptors. In contrast, the NGF-induced mechanical hyperalgesia seems to be independent of mast cell degranulation or central NMDA receptor sites.
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    European journal of neuroscience 8 (1996), S. 0 
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We have investigated the properties of antidromically identified lamina I neurons in the rat dorsal horn (in vivo) after neonatal administration of antibody to nerve growth factor (anti-NGF). Treatment from postnatal day (P) 2 to P9 yielded normal lamina I cell physiology; most cells responded to mechanical nociception and the remainder had a wide dynamic range (WDR). Extending anti-NGF treatment to P14 reduced the proportion of cells responding to mechanical nociception, increased the proportion of WDR cells, and caused the emergence of cells not driven by cutaneous inputs. Both nociceptive-specific and WDR cells had larger receptive fields, suggestive of enhanced central action of the remaining nociceptive afferents. These findings cannot be explained by direct action of anti-NGF on spinal cord neurons since both P2-9 and P2-14 treatments should have had similar effects given the time course of development of the blood-brain barrier. The results are discussed in terms of previous findings indicating normal numbers of D-hairs and high-threshold mechanoreceptors (HTMRs) after anti-NGF treatment from P2 to P9, but a decline in the number of HTMRs and an increase in the number of D-hairs after treatment from P2 to P14. It is suggested that the reduction in nociceptive neurons and the appearance of neurons not driven by cutaneous stimulation in lamina I results from the reduction in HTMR input. However, D-hair input to lamina I did not increase despite the larger number of these afferents, suggesting that their central action was regulated to maintain appropriate modality relationships between periphery and centre.
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