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  • 1
    ISSN: 1432-2307
    Keywords: Glioma antigens ; Epidermal growth factor receptor ; Nerve growth factor receptor ; Transferrin receptor ; Chromosomes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The human glioblastoma-derived cell lines 86HG-39, 87HG-28 and 87HG-31, used for the production of monoclonal antibodies (mAbs) against glioma-associated antigens (GAA), were characterized in terms of morphology, growth behaviour, chromosomes and antigen expression. In the primary tumours, differential expression of glial fibrillary acidic protein, S100 protein, Leu-7 and GAA as defined by mAbs MUC 2–39, MUC 2–63 and MUC 8–22 was demonstrated. Receptors for epidermal growth factor (EGFr) and nerve growth factor (NGFr) were found in many cells in short-term cultures, but the transferrin receptor (Tr) was found in only a few cells of 87HG-28. In permanent cell lines, differentiation antigens and EGFr decreased and Tr increased markedly. NGFr and GAA remained stable. Transplantation tumours of 86HG-39 were partly positive for Tr and GAA. Chromosomal analysis revealed that the 86HG-39 and 87HG-28 cell lines had a hypodiploid or diploid stem line with lines in the hypotetraploid to tetraploid region for 50 in vitro passages. The 87HG-31 cell line had chromosomal patterns in the hypotriploid to triploid region. A gain of chromosomes was seen in the groups C7, C8, C10, D14, F19, F20, G21, G22. The variability of antigens in these tumours and especially during long-term cultivation probably reveals an ability to influence the growth of malignant glioma cells via the respeective effector molecules.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Research in experimental medicine 169 (1976), S. 33-43 
    ISSN: 1433-8580
    Keywords: Methylnitrosourea ; experimental stomach tumours ; adenomatous polyp ; neurinoma ; Methylnitrosoharnstoff ; experimentelle Magentumoren ; adenomatöse Polypen ; Neurinom
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die onkogene Wirkung von N-Methyl-N-Nitrosoharnstoff wurde beim Hanford-Miniaturschwein untersucht. Die Substanz wurde jeweils unter Zusatz von 1% NaH2PO4 in physiologischer Kochsalzlösung gelöst (pH 6,1 – 6,2) und den Versuchstieren peroral in 14tägigen Abständen bis zum Versuchsende verabfolgt. Nach einer Versuchsdauer von 4 1/2 Jahren wurden die klinisch unauffälligen Tiere getötet und untersucht. Hierbei zeigte sich, daß alle Tiere Magentumoren entwickelt hatten. Bei den induzierten Tumoren handelt es sich - von einer Ausnahme abgesehen- um multiple, exophytisch wachsende, größtenteils gestielte, blumenkohlartige Schleimhauttumoren, die vorwiegend in der Kardia- bzw. Fundusregion lokalisiert sind. In einem Falle fand sich zusätzlich ein im Bereich der Submucosa der Kardia lokalisierter Tumor. Aufgrund ihrer histologischen Struktur lassen sich die Schleimhauttumoren als adenomatöse Polypen klassifizieren. Einige dieser in der Regel benignen Tumoren tragen cytologische Merkmale einer beginnenden malignen Entartung. Bei dem in der Submucosa lokalisierten Tumor handelt es sich vermutlich um ein malignes Neurinom. Die vorliegenden Ergebnisse zeigen, daß die Organotropie bestimmter onkogener Nitrosamide u.a. auch speciesabhängig sein kann. Diese Erkenntnis dürfte nicht nur hinsichtlich der Morphogenese von Magentumoren sondern darüberhinaus auch der Ätiopathogenese von Bedeutung sein.
    Notes: Summary The oncogenic effect of N-methyl-N-nitrosourea was studied in Hanford miniature-pig. The compound - dissolved in 0,9% NaC1 (pH 6,1 – 6,2) and supplemented with 1% NaH2PO4 - was administered per os to the animals in intervals of two weeks during 4,5 years. Finally the animals, which had behaved clinically inapparent during the whole run of the experiment, were sacrificed and autopsied. All animals of the experimental group had developed stomach tumours, whereas control animals showed normal conditions of gastric mucosa. Except one, all tumours were grouped macroscopically as multiple, exophytic, papillary, cauliflower-like neoplasms of the mucosa, located predominantly within cardia- and fundus-regions. Histologically they are to be classified generally as benign adenomatous polyps. However, a few of them also possess cytological characteristics of an early malign dedifferentiation. One - above excepted - tumour probably belongs to the class of malign neurinomas. The results of the experiment demonstrate in general that the obvious organotropic properties of certain oncogenic nitrosamides might be in a way also species-depending ones. This perception seems to be important in view of morphogenesis as well as of etiopathogenesis of stomach tumours.
    Type of Medium: Electronic Resource
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