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  • 1
    ISSN: 1432-1335
    Keywords: Nude mice ; Thymus dysplasia ; Combined chemotherapy ; VCR ; 5-FU ; Regressive organ changes ; Leucopenia ; “nude”-Maus ; Thymusdysplasie ; kombinierte Chemotherapie ; VCR ; 5-FU ; regressive Organveränderungen ; Leukopenie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die kombinierte Chemotherapie mit Vincristin (VCR) und 5-Fluorouracil (5-FU) war nach Festlegung der LD50 im humanmedizinischen Dosierungsbereich bei 150 kongenital thymusdysplastischen “nude”-Mäusen ohne Komplikationen durchführbar. Unter spf-Bedingungen durchliefen ca. 5 Wochen alte syngene Balb/c-“nude”-Mäuse einen 9 tägigen Therapiezyklus. Die Teilsynchronisation wurde mit VCR am Tag 1 eingeleitet und 5-FU jeweils vom 1. bis 3. Tag intraperitoneal appliziert. Pathohistologisch entstanden unter VCR bei einer Dosis von 20% der LD50 bei allen Tieren Milzatrophien und schwere Jejunitiden. Die durch Verminderung überwiegend segmentkerniger Zellen entstandenen Leukopenien waren erwartungsgemäß reversibel. Nach 5-FU-Applikation entstanden bei einer 20% igen Dosierung der LD50 hauptsächlich Zystitiden, bei 67% Bronchitiden und Lobärpneumonien. In der Kombination mit humanmedizinisch relevanten Dosierungen entwickelten die Tierkollektive regressive Veränderungen an Harnblasen- und Zottenepithelien des Jejunums. Neben Hepatitiden mit Gruppennekrosen fanden sich Pneumonien bei 50% der Tiere; Milzatrophien waren mäßig ausgeprägt. Die Lymphknoten zeigten eine Tendenz zur Strukturauflösung der Follikel ohne spezifische Veränderungen der paracorticalen Region. Hämatologisch war nach reversibler Leukopenie mit Granulozytopenie die Einleitung eines 2. Zyklus am 9. Tag möglich. Nach Kenntnis dieser Befunde ist die Möglichkeit gegeben, die Wirksamkeit von VCR und 5-FU auf das Wachstum humanen kolorektalen Tumorgewebes nach erfolgter Transplantation auf “nude”-Mäuse in vivo zu testen.
    Notes: Summary Five-week-old syngeneic, female BALB/c nude mice were injected i. p. with vincristine (VCR) and 5-fluorouracil (5-FU) to determine the LD 20 of these drugs under spf-conditions. One hundred fifty animals were given dosages similar to those administered clinically, and a complete autopsy was performed on all nude mice. Whereas VCR caused splenic atrophy and regressive changes in the jejunal epithelium, the application of 5-FU was followed mainly by regressive changes in the transitional epithelium of the bladder, and 67% of the animals developed pneumonia. These pathohistological changes were also seen after a combined chemotherapy, and a temporary leucopenia was reversible. These experiments showed that chemotherapy of nude mice with VCR and 5-FU is possible provided they have been successfully xenotransplanted with human colorectal adenocarcinomas.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 97 (1980), S. 15-21 
    ISSN: 1432-1335
    Keywords: Nude mice ; Combined chemotherapy ; VCR ; 5-FU ; Adjuvant chemotherapy ; Xenotransplantation ; Human colorectal adenocarcinomas ; Tumor remission
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The poor 5-year survival rate of patients with malignant colorectal tumors calls for clarification of the question as to whether it is advisable to carry out postoperative adjuvant chemotherapy. In the present study a simple “in vivo” test is described with which the sensitivity of individual human adenocarcinomas of the colon, primary xenotransplanted onto syngeneic “nude”-mice suffering from congenital thymic dysplasia, to cytostatic therapy with 5-FU and VCR could be determined. Five of six primary xenotransplanted tumors showed a significant reduction in size following combined therapy with these drugs in doses comparable to those administered clinically, whereas one of the transplanted tumors remained unresponsive to therapy. On the basis of these results it is absolutely necessary that a comparison be carried out between the rate of tumor remission in groups of patients and animals undergoing the same chemotherapy.
    Type of Medium: Electronic Resource
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