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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neural transmission 4 (1992), S. 181-190 
    ISSN: 1435-1463
    Keywords: MPP+ ; binding sites ; autoradiography mammalian brain ; dopamine ; neurotoxicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The distribution and density of3H-MPP+ binding sites were studied by in vitro quantitative autoradiography in the brain of the mouse, rat and monkey. The highest levels of3H-MPP+ specific binding were observed in rat brain. The substantia nigra in rat and monkey, and the anterior caudate-putamen formation in mouse and monkey showed the lowest density of autoradiographic grains. The presence of a relatively high density of MPP+ sites in the hippocampus of all species studied could be of interest to explain some effects of MPTP administration on convulsions caused by chemoconvulsants. The finding of a 60–70% reduction of3H-MPP+ binding sites in the rat caudate-putamen, on the side of quinolinic acid infusion and no changes after 6-hydroxydopamine lesion of dopaminergic nigrostriatal neurons suggests the presence of these sites mainly on striatal cells. The results suggest that the distribution of MPP+ binding sites in brain would not seem to be related to MPTP toxicity.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1590-3478
    Keywords: progressive systemic sclerosis ; peripheral nervous system ; electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario Viene presentato un caso di una paziente affetta da Sclerosi Sistemica Progressiva, caratterizzata dalla presenza di una polineuropatia ad esordio precoce accanto ai sintomi tipici della malattia. In letteratura tale associazione è stata descritta raramente. In questo lavoro viene descritto per la prima volta lo studio ultrastrutturale del nemo periferico affetto. Lo studio neuropatologico del nemo surale mostra una quasi completa perdita di fibre mieliniche. Le cellule di Schwann mostrano una anormale iperplasia della membrana basale con segni morfologici di denervazione. Di particolare interesse è la presenza di corpi di Luse (spindle-shaped banded structures) sia all'interno del citoplasma schwannico sia nell'endonevrio. Sulla base dei dati ultrastrutturali vengono discusse alcune ipotesi sul meccanismo patogenetico di questa neuropatia.
    Notes: Abstract We present the case of a woman with progressive systemic sclerosis (PSS) in whom the usual symptoms were preceded by a rapidly progressive peripheral neuropathy. Few cases of peripheral nerve involvement have been described. For the first time we report an ultrastructural study of an affected peripheral nerve and muscle. In the sural nerve we found an almost complete loss of myelinated fibers. Schwann cells showed an abnormal hyperplasia of their basal membranes and structural signs of denervation. Spindle-shaped banded structures were seen in the cytoplasm of Schwann cells and in the endoneurium. On the basis of these ultrastructural data some hypotheses on the pathogenetic mechanism of this neuropathy are discussed.
    Type of Medium: Electronic Resource
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