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  • 1
    ISSN: 1573-7373
    Keywords: MTT assay ; test variables ; brain tumors ; chemosensitivity test ; cell culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The aim of this study was to optimize the experimental conditions of the MTT assay for primary cultures of human brain tumors. This assay is based on the mitochondrial reduction of MTT-(3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) salt to formazan crystals by living cells. Formazan can be quantified spectrophotometrically. This assay measures the antimetabolic and, by using an adequate recovery period for the cells, also the antiproliferative effects of cytotoxic drugs. Our results suggest the following experimental design for its application as an chemosensitivity assay for human brain tumors: 1-h drug exposure followed by a seven days recovery period without drugs. Then tumor cells are incubated 4 hours with 1 mg MTT/ml and final absorbance readings are performed at 550 nm and 630 nm as test and reference wavelengths respectively. In this way, the assay seems to be a reliable and simple method for rapid chemosensitivity testing in human brain tumors.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-7373
    Keywords: brain tumor ; MTT assay ; CFA ; in vitro chemosensitivity ; cell culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In this study we assessed the influence of patient- and drug-specific parameters in the short-term MTT-chemosensitivity assay in 150 primary cell cultures derived from human brain tumors. In 45 patients the MTT assay was directly compared with the CFA (Colony Forming Assay). Resistance was 10–20% higher in the MTT assay than in the CFA, but there was a good agreement in both assays, that more malignant gliomas had a higher in vitro chemosensitivity against ACNU and BCNU. Overall the results demonstrate, that there is no uniform correlation between the in vitro chemosensitivity and the histopathological classification of the tumors, which corresponds well to the clinical situation. On the basis of this study we suggest prospective clinical trials with the MTT assay in human brain tumors. Parts of this paper have been presented at the 63th annual meeting of the ‘Deutsche Gesellschaft für Neurologie’, September 13–15, 1990, in Darmstadt, Germany
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-7373
    Keywords: mitoxantrone ; malignant human brain tumors ; DNA strand breaks ; alkaline elution ; flourescence spectrophotometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In this study mitoxantrone (Mtx) induced DNA strand breaks were measured with the alkaline elution technique in short term cell cultures derived from human gliomas. Glioblastomas or astrocytomasfrom 5 patients who underwent intracranial surgery were cultured and incubated 1 h with different concentrations of Mtx (0, 0.01, 0.1 and 1.0 μg/ml). The alkaline elution methodwas modified to measure DNA lesions in human gliomas. Mtx inducedDNA strand breaks in a dose dependent manner in all cell culturestested. There was a linear increase of DNA strand break frequencyinduced by Mtx between 0.01—1.0 μg/ml. Concerning these in vitro data, Mtx might be potentially useful for the treatment ofpatients with malignant brain tumors.
    Type of Medium: Electronic Resource
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