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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 49 (1980), S. 225-230 
    ISSN: 1432-0533
    Keywords: Human pituitary adenomas ; Tissue culture ; Cell culture ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Pituitary adenomas of 120 patients were investigated in tissue and in cell cultures. Under different conditions of culture, the biopsies revealed different rates of growth. In tissue cultures 66% of the samples could be propagated while tumour specimens explanted in cell suspensions proliferated in 80% of the cases. Attempts to establish subcultures were also more successful when specimens were put into cell cultures primarily. Further differences of growth characteristics were observed in connection with the histological types of the parent tissues. According to the old terminology cells of mixed type adenomas had the longest life-span both in tissue and in cell cultures. Considering the proliferative activity, this type of tumour could be most frequently subcultured. Concerning the relationship of different cell components of the biopsies it was proven that survival and proliferation of adenoma cells may occur without fibroblasts. The appearance of fibroblast-like cells in older cultures is a morphological manifestation of the senescence of the specific cell types. Qualitative features of cultured adenoma cells showed that on the basis of cytomorphological properties “chromophobe” samples could be separated from the other types. Cells of acidophil and mixed type growths had the capacity of developing in vitro various migratory shapes, while “chromophobe” cells did not possess this ability. The histological diagnoses made independently from cultures confirmed the tissue culture findings. Differences of in vitro characteristics correlated also with the ultrastructural features of the cultured adenoma cells.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 56 (1982), S. 245-249 
    ISSN: 1432-0533
    Keywords: Pituitary adenoma ; Cell culture ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A pituitary adenoma from an acromegalic female patient has been studied in cell cultures. Two populations of parenchymal cells, i.e., elongated shapes and big pale forms with irregular outlines, were distinguished light-microscopically. Ultrastructurally, three types of cells were found. Two of them contained secretory granules in varying numbers and sizes. Based on the proportion of the various cellular elements these cells were considered as counterparts of the elongated shapes being responsible for the GH secretion at different rates. The third cell type with very few secretory granules was identified with the big pale forms. Presumably, they could be exhausted GH-secreting cells. Besides fine structural characterisation, cultured cells of endocrinologically active human pituitary adenomas offer suitable models for studying some phases of exocytosis and membrane retrieval.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 80 (1990), S. 328-333 
    ISSN: 1432-0533
    Keywords: Pituitary adenoma ; Neuronal and lipomatous hamartoma ; Immunocytochemistry ; Electron micrscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The histological, ultrastructural and immunocytochemical features are reported of an intrasellar neuronal and lipomatous hamartoma associated with pituitary growth hormone (GH) cell adenoma and acromegaly. Electron microscopy demonstrated a close contact between neurons and adenomatous GH cells. By immunohistochemistry the adenoma cells revealed a positive staining for GH and prolactin. the neurons of hamartoma showed neurosecretory activity which might have induced the development of pituitary GH cell adenoma.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 44 (1978), S. 135-139 
    ISSN: 1432-0533
    Keywords: Tissue culture ; Recurrences of astrocytomas ; Recurrences of oligodendrogliomas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We report a tissue culture study of 50 recurrent supratentorial gliomas. From the initial and recurrent operations 23 astrocytomas and 8 oligodendrogliomas were cultured. 15 astrocytomas and 4 oligodendrogliomas were explanted at the time of recurrence only. On the basis of a three-stage grading system 6 astrocytomas were originally classified as A 1, and 17 as A 2 on cultivation. Oligodendrogliomas proved originally to be O 1 in three cases, and O 2 in five cases. After reoperations all of the A 1 astrocytomas became A 2, 16 A 2 astrocytomas remained unchanged, one A 2 astrocytoma changed, to a glioblastoma. After the third operation one A 2 astrocytoma retained its character, and another one transformed to a glioblastoma. All recurrences of O 1 oligodendrogliomas changed to O 2, and one of them retained this character after the third and fourth operations as well. In the O 2 group, two recurrent oligodendroglioma were unchanged, and three became glioblastomas. The second recurrence of a single O 2 oligodendroglioma showed transformation to a glioblastoma. Cultures indicated a high tendency toward malignant changes, both in astrocytomas and oligodendrogliomas. These changes were closely connected with the presence of immature glial cells. By comparing the tissue culture findings with the clinical data, we conclude that on the basis of cytological malignancy an exact prediction of clinical recurrence is not possible.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 48 (1979), S. 177-190 
    ISSN: 0942-0940
    Keywords: Optic nerve glioma ; tissue culture ; piloid astrocytes ; immature glia cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cytological characteristics of optic nerve gliomas were studied parallel with histological structures in cell and tissue cultures. Histologically the tumours consisted of four different cell types: spindle-shaped elongated cells, round cells, stellate forms, and multinucleated cells. Dynamic properties of cultured optic glioma cells showed that stable cellular elements of the parent tissue arise from two fundamental populations, viz from elongated (piloid), and from round cells. Cells of both populations displayed a series of changes in the course of their culture. A certain part of the slender elongated cells enlarged and became plump piloid cells of various shapes, or big stellate astrocytes. Giant multinucleated variants of these forms also emerged by fusion of the mononucleate forms. The round cells gradually turned into immature Astrocytes, and by a subsequent cell fusion they gave birth to big stellate cells. With the ageing of the cultures a polymorphous cellular picture developed which was mainly due to the active migratory and intracellular movements of the elongated and round cellular elements. Mitoses played a negligible role in this process. Several characteristics suggest that the round shapes are immature glia cells, and represent the least differentiated elements among all the cell components. The stellate and giant multinucleated forms might be considered as end-products of glia cell differentiation and they could originate both from the elongated and the round cells.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 21 (1969), S. 139-151 
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Autoren haben Gewebskulturen von folgenden menschlichen Hirntumoren gezüchtet: Glioblastoma multiforme, malignes Astrozytom und endotheliomatöses Meningeom. Die Wirkung von zwei Antibiotika, Actinomycin C (Sanamycin) und Actinomycin D, auf diese Kulturen wurden untersucht. Die Ergebnisse wurden quantitativ durch Bestimmung der Wachstums-Hemmungsrate und des Mitosen-Index der Explantate gemessen; qualitativ durch Untersuchung der Änderung der Zellstruktur. Im Vergleich zu den Meningeomen reagierten die malignen Gliome empfindlicher auf beide Medikamente. In den Gliom-Kulturen wurden quantitative Unterschiede hinsichtlich der Reaktion auf beide Pharmaka beobachtet: Man benötigt eine höhere Konzentration von Actinomycin D als von Actinomycin C, um die gleiche Wirkung zu erzielen. In den Meningeom-Kulturen hatte eine identische Konzentration beider Medikamente ungefähr die gleiche Wirkung. Die Autoren besprechen das Problem der in vitro-Testung und in vivo-Anwendung von chemotherapeutischen Mitteln. Sie empfehlen die Durchführung von Empfindlichkeits-Tests in Gewebskulturen vor Beginn einer Chemotherapie.
    Abstract: Résumé Les auteurs ont préparé des cultures de tissu à partir de tumeur du cerveau de l'homme tels que glioblastome multiforme, astrocytome malin et méningiome endothélial. Les effets cytostatiques de 2 antibiotiques: Actinomycine C — Sanamycine et Actinomycine D ont été étudiés sur ces cultures. Quantitativement, les résultats sont enregistrés par la détermination de l'inhibition de la croissance et de l'index mitotique des prélèvements; qualitativement, par l'évaluation de l'altération de la morphologie cellulaire. Par comparaison avec les méningiomes, les gliomes malins paraissent plus sensibles aux 2 drogues. Dans les cultures de gliome, des différences quantitatives ont été observées dans la réponse aux 2 drogues: une plus forte concentration d'Actinomycine D a été nécessaire pour obtenir le même effet qu'avec l'Actinomycine C. Dans les cultures de méningiome, une concentration identique des 2 drogues atteint à peu près le même effet. Les auteurs discutent le problème tu test in vitro et de l'application in vivo de drogues chimiothérapiques. Ils proposent l'idée de réaliser un test de sensibilité avant les cultures de tissu par chimiothérapie.
    Notes: Summary The authors prepared tissue cultures from the following human brain tumours-glioblastoma multiforme, astrocytoma malignum and meningeoma endotheliomatosum. The cytostatic effects of two antibiotics, Actinomycin C (Sanamycin) and Actinomycin D were studied on these cultures. Quantitatively, the results were rated by the determination of the growth inhibition rate and the mitotic index of the explants; qualitatively, by evaluating the alteration of cellular morphology. As compared with the meningiomas, the malignant gliomas reacted more sensitively to both drugs. In the glioma cultures quantitative differences were observed between the responses to both drugs: a higher concentration of AD was required to obtain the same effect as with AC. In the meningioma cultures the identical concentration of both drugs brought about the same effect. The authors discuss the problem of thein vitro testing andin vivo application of chemotherapeutic drugs. They raise the idea of performing a sensitivity test in tissue culture prior to chemotherapy.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Mutation Research/Environmental Mutagenesis and Related Subjects 74 (1980), S. 209-210 
    ISSN: 0165-1161
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of environmental contamination and toxicology 57 (1996), S. 875 -880 
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of environmental contamination and toxicology 56 (1996), S. 833 -838 
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 89 (1968), S. 241-249 
    ISSN: 1432-0878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung 1. Vom Thymus embryonaler Ratten wurden durch Trypsin-Dissoziation und Aussetzen von Mutterstücken Zell- bzw. Gewebekulturen gewonnen. In den Kulturen erschienen ein- und vielkernige myoide Elemente, deren vielkernige eine Querstreifung zeigten und spontane Kontraktionen ausführten. In elektronenmikroskopischen Untersuchungen des Thymus von 5 Tage alten Meerschweinchen wurden quergestreifte Elemente gleichfalls nachgewiesen. 2. Es fragt sich, ob die vielkernigen Gebilde durch Verschmelzung einkerniger Zellen entstehen können.
    Notes: Summary 1. Cell and tissue cultures have been obtained from embryonic rat thymus by dissociation with trypsin and explantation of fragments of the organ. In these cultures mono- and multinuclear myoid elements appeared among which the multinuclear ones showed cross-striation and performed spontaneous contractions. Cross-striated elements have been found also in the thymus of 5-day-old guinea pigs with the aid of the electron microscope. 2. Possibly the multinuclear myoid elements observed resulted from fusion of mononuclear cells.
    Type of Medium: Electronic Resource
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