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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 45 (1967), S. 1238-1241 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary 1. The subcellular localization of catecholamines in a human phaeochromocytoma was investigated. 78% of the catecholamines could be sedimented. 2. The hormone containing granules were separated from lysosomes and mitochondria and their biochemical composition was determined. The molar ratio catecholamine/ATP was found to be 5,56. 63,4% of the proteins were water soluble. Lysolecithin comprised 17% of total lipid phosphorus. 3. These results are in good agreement with findings on granules from normal adrenal medullae of various species. 4. On incubation at 37° C tumour granules released their catecholamines at a rate similar to that of normal granules. 5. Possible explanations for the high catecholamine secretion from phaeochromocytomas are discussed.
    Notes: Zusammenfassung 1. Die subcelluläre Lokalisation der Katecholamine in einem Phäochromocytom wurde untersucht. 78% der Katecholamine waren sedimentierbar. 2. Die Hormon-speichernden Granula wurden von Lysosomen und Mitochondrien weitgehend abgetrennt und ihre biochemische Zusammensetzung untersucht. Der molare Katecholamin/ATP-Quotient betrug 5,56, die Eiweißlöslichkeit in Wasser 63,4% und der Lysolecithinanteil an den Phospholipiden 17%. 3. Diese Ergebnisse stimmen gut mit Befunden an Granula normalen Nebennierenmarks verschiedener Species überein. 4. Bei Inkubation (37° C) gaben Tumorgranula ihre Katecholamine mit ähnlicher Geschwindigkeit ab wie normale Granula. 5. Die möglichen Ursachen für die gesteigerte Katecholaminabgabe aus Phäochromocytomen werden diskutiert.
    Type of Medium: Electronic Resource
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