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  • Electronic Resource  (4)
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  • Electronic Resource  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science, Ltd
    European journal of neuroscience 17 (2003), S. 0 
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The common receptor for neurotrophins, p75, has important roles in internalization and trafficking of neurotrophins along axons. Recent studies show that an astonishing array of proteins, including lectins, pathogens and neurotoxins, bind the p75 receptor, suggesting that they can hijack and utilize this receptor for trafficking between neuronal populations within the nervous system. Such pathogens include the neurologically important rabies viruses, prion proteins, β-amyloid and possibly tetanus toxin. These proteins may hijack existing transport machineries designed to traffick neurotrophins, thus allowing the infiltration and distribution of pathogens and toxins among vulnerable neuronal populations with devastating effects, as seen in rabies, prion encephalopathies, Alzheimer's disease and tetanic muscle spasm. The discovery of an entry and transport machinery that is potentially shared between pathogens and neurotrophins sheds light ono trafficking systems in the nervous system and may assist the design of novel therapeutic avenues that prevent or slow the progression of diverse chronic and acute neurological disorders.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Glial cell line-derived neurotrophic factor (GDNF) mediates trophic effects for specific classes of sensory neurons. The adult tooth pulp is a well-defined target of sensory trigeminal innervation. Here we investigated potential roles of GDNF in the regulation of adult trigeminal neurons and the dental pulp nerve supply of the rat maxillary first molar. Western blot analysis and radioactive 35S-UTP in situ hybridization revealed that GDNF in the dental pulp and its mRNAs were localized with Ngf in the coronal pulp periphery, in particular in the highly innervated subodontoblast layer. Retrograde neuronal transport of iodinated GDNF and Fluorogold (FG) from the dental pulp indicated that GDNF was transported in about one third of all the trigeminal dental neurons. Of the GDNF-labelled neurons, nearly all (97%) were large-sized (≥35 µm in diameter). Analysis of FG-labelled neurons revealed that, of the trigeminal neurons supporting the adult dental pulp, ≈ 20% were small-sized, lacked isolectin B4 binding and did not transport GDNF. Of the large-sized dental trigeminal neurons ≈ 40% transported GDNF. About 90% of the GDNF-accumulating neurons were negative for the high-temperature nociceptive marker VRL-1. Our results show that a subclass of large adult trigeminal neurons are potentially dependent on dental pulp-derived GDNF while small dental trigeminal neurons seems not to require GDNF. This suggests that GDNF may function as a neurotrophic factor for subsets of nerves in the tooth, which apparently mediate mechanosensitive stimuli. As in dorsal root ganglia both small- and large-sized neurons are known to be GDNF-dependent; these data provide molecular evidence that the sensory supply in the adult tooth differs, in some aspects, from the cutaneous sensory system.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The second-order visual neurons in the developing avian optic tectum depend on a trophic signal which is transported anterogradely by retinal ganglion cells11. We examined the transport of five trophic factors in the developing retinotectal projection of chick embryos (Figs 1,2), including the ...
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Primary olfactory and central projections of the nervus terminalis were investigated by injections of horseradish peroxidase into the olfactory epithelium in the African lungfish. In addition, gonadotropin-releasing hormone (GnRH) immunoreactivity of the nervus terminalis system was investigated. The primary olfactory projections are restricted to the olfactory bulb located at the rostral pole of the telencephalon; they do not extend into caudal parts of the telencephalon. A vomeronasal nerve and an accessory olfactory bulb could not be identified. The nervus terminalis courses through the dorsomedial telencephalon. Major targets include the nucleus of the anterior commissure and the nucleus praeopticus pars superior. Some fibers cross to the contralateral side. A few fibers reach the diencephalon and mesencephalon. No label is present in the “posterior root of the nervus terminalis” (=“Pinkus's nerve” or “nervus praeopticus”). GnRH immunoreactivity is lacking in the “anterior root of the nervus terminalis”, whereas it is abundant in nervus praeopticus (Pinkus's nerve). These findings may suggest that the nervus terminalis system originally consisted of two distinct cranial nerves, which have fused-in evolution-in most vertebrates. Theories of cranial nerve phylogeny are discussed in the light of the assumed “binerval origin” of the nervus terminalis system.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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