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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European archives of oto-rhino-laryngology and head & neck 192 (1968), S. 214-228 
    ISSN: 1434-4726
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wird fiber einen Versuch berichtet, am Modell eines mit 4-Dimethylaminostilben induzierten Geh6rgangstumors der Ratte mit histologischen, cytologischen, zellkinetischen, cytophotometrischen Bowie respirometrischen Methoden Eigenschaften zu definieren, die charakteristisch fur die Malignität dieser Geschwulstart sind. Bei diesem Tumor handelt es sich um ein gut differenziertes, teilweise verhorntes Plattenepithelcarcinom, das wegen gelegentlicher papillär-cystischer Ausreifung histogenetisch auf Ceruminaldrüsen zuriickgeführt werden kann. Der gegenüber Kontrollgeweben um ein Mehrfaches niedrigere O2-Verbrauch spricht für einen überwiegend anaeroben Energiestoffwechsel im Tumor. Die Generationszeit wurde sowohl autoradiographisch (Ts/H3-Markierungsindex) als auch mit der Colchizinmethode gemessen. Die von diesem Carcinom entwickelte hypooctoploide DNS-Stammlinie verschwand bereits nach einmaliger Röntgenbestrah lung mit 1000 rad, wobei Zellkerne mit extrem hohem DNS-Gehalt auftraten. Gleichzeitig verldngerte sich die mittlere Generationsdauer der Carcinomzellen um nahezu das Doppelte des Ausgangswertes vor der Bestrahlung. Da die DNS-Synthese dagegen unbeeinflußt weiterlief, wurde gefolgert, daß das bestrahlte Carcinom bis zur Ausbildung einer neuen DNS-Stammlinie überwiegend endomitotisch wächst.
    Notes: Summary An account is given of a model of the external auditory meatus tumour of the rat which was induced by 4-dimethylaminostilben. Histological, cytogenetical, cytophotometrical and microrespiratory methods have been used to determine the malignity of this kind of tumour. They were well differentiated groups of cells partially cornified squamous epithelial carcinoma, which sometimes owing to the maturation of papillary cyst, they could be originated histogenetically from the ceruminous gland of the skin in the meatus. The rate of the oxygen consumption of this carcinoma was considerably lower than the control tissues. This finding indicated probably an anaerobic metabolism. The duration of the cell-cycle was measured by autoradiography (Ts/3H labeling index), as well as by colchicine method. Experiments with X-ray treatment were also applied to this tumour. It showed that the hypooctoploide DNA stemline, which developed from this carcinoma, had already disappeared after being exposed only once to X-ray treatment at 1000 rad. The nuclei appeared to contain extremely high DNA content, at the same time, the mean value of the duration of the cell-cycle is prolonged by nearly 2 times more than its original value before radiation. However, since the DNA synthesis proceeded without interruption, thus it is concluded that the radiated carcinoma is being developed in endomitotic manner until a new DNA stem-line is reached.
    Type of Medium: Electronic Resource
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