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  • 1
    ISSN: 0014-5793
    Keywords: Bradykinin ; Cell volume ; Intracellular calcium ; Na^+/H^+ exchanger ; ras oncogene
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1459
    Keywords: Cerebral white matter ; Sphingomyelin ; Fatty acid composition ; Demyelination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wird eine Mikromethode zur Untersuchung der Fettsäurezusammensetzung von Sphingomyelin beschrieben. In der Marksubstanz von 17 normalen erwachsenen Vergleichshirnen sind die wichtigsten Fettsäuren C 18:0 und C 24:1. Unsere Ergebnisse stimmen gut mit den Ergebnissen anderer Autoren überein. Bei Kindern findet sich eine relative Vermehrung kurzkettiger Fettsäuren, diese Verschiebung ist typisch für „unreifes“ Myelin. Ähnliche Veränderungen werden hier auch bei Greisen und Fällen mit unspezifischem Hirnschaden (Autolyse), chronischer Urämie und juveniler Chorea Huntington (alle in Verbindung mit diffuser Entmarkung) beschrieben. Man kann davon ausgehen, daß die Fettsäurezusammensetzung von Sphingomyelin einen empfindlichen Maßstab sowohl für eine gestörte Myelinisierung wie auch für Demyelinisierung darstellt.
    Notes: Summary A micromethod for the investigation of the fatty acid composition of sphingomyelin is presented. In the cerebral white matter of 17 normal adult brains, analyzed for reference, the predominant fatty acids are C 18:0 and C 24:1. Our results are in agreement with those of other authors. Short chained fatty acids are relatively increased in young children; this shift is typical of “immature” myelin. Similar changes are described here in old persons and cases of non-specific brain damage associated with demyelination (autolysis, chronic uremia, juvenile chorea). Sphingomyelin fatty acid composition can be considered a sensitive measure of both disturbed myelination and demyelination.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2013
    Keywords: Cell volume ; Intracellular pH ; ras oncogene ; Calcium oscillations ; Cell membrane potential ; Bradykinin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In NIH 3T3 fibroblasts expressing the Ha-ras oncogene (+ras) bradykinin leads to sustained oscillations of cell membrane potential due to oscillations of intracellular Ca2+ with subsequent activation of Ca2+-sensitive K+ channels. In cells not expressing the oncogene (-ras), bradykinin leads only to a single transient hyperpolarization of the cell membrane. The present study has been performed to elucidate the possible interaction of cell volume, intracellular pH and bradykinin-induced oscillations of the cell membrane potential. Bradykinin leads to cell shrinkage and intracellular alkalinization of both +ras cells and −ras cells. Inhibition of Na+/H+ exchanger by HOE 694 abolishes the bradykinin-induced alkalinization but does not significantly interfere with the bradykinin-induced oscillations of cell membrane potential. In contrast, prevention of bradykinin-induced cell shrinkage by simultaneous reduction of extracellular osmolarity blunts the oscillations. Thus, cell shrinkage stimulates bradykinin-induced oscillations of cell membrane potential. On the other hand, cell shrinkage alone does not elicit oscillations unless, in addition, Ca2+ entry is stimulated by ionomycin.
    Type of Medium: Electronic Resource
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