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  • 1
    Electronic Resource
    Electronic Resource
    Immunohistochemical expression of glutathione S-transferase placental type (GST-π), a detoxifying enzyme, in normal arachnoid villi and meningiomas (1990)
    Springer
    Virchows Archiv 417 (1990), S. 493-496 
    Details
    ISSN: 1432-2307
    Keywords: Arachnoid villi ; Meningioma ; Glutathione S-transferase placental type ; Cerebrospinal fluid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Human normal dura mater containing arachnoid villi were examined for their expression of glutathione S-transferase placental type (GST-π), a detoxifying enzyme, using an immunohistochemical method. All of the arachnoid villi and arachnoid cells in five normal cases were found to have expression of GST-π, although no positive reaction for the enzyme was present in other tissues of the dura mater. The results show a possible role for arachnoid tissues in protecting human brain from hazardous xenobiotics in the cerebrospinal fluid. Twenty-six meningiomas were also examined for expression of the enzyme. Tissues of meningotheliomatous meningiomas were always positive for expression of the enzyme. Transitional meningiomas also showed the expression in their meningotheliomatous components. No staining reaction of GST-π was recognized in fibroblastic meningiomas except for two cases with a tendency to meningotheliomatous differentiation. The findings suggest a functional similarity between the arachnoid tissues and meningotheliomatous components of meningiomas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01625729
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  • 2
    Electronic Resource
    Electronic Resource
    Nucleolar organizer region score and Ki-67 labelling index in high-grade gliomas and metastatic brain tumours (1991)
    Springer
    Acta neurochirurgica 109 (1991), S. 37-41 
    Details
    ISSN: 0942-0940
    Keywords: Glioma ; metastatic brain tumour ; Ki-67 ; nucleolar organizer regions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Sixteen cases of malignant brain tumours comprising 6 anaplastic astrocytomas, 3 glioblastoma multiforme, 1 medulloblastoma and 6 metastatic brain tumours were investigated independently by a silver colloid method for nucleolar organizer regions (NORs) and an immunohistochemistry using a monoclonal antibody against a nuclear antigen, Ki-67, in proliferating cells. The correlation between the mean number of NORs and the percentage of Ki-67 labelled cells (Ki-67 labelling index) was examined. In addition, four normal brain tissue samples without neoplastic cells were stained for NOR. The mean number of NORs in these malignant brain tumours was significantly greater than that in normal astrocytes (p〈0.001). Moreover, both the mean number of NORs and the Ki-67 labelling index in metastatic brain tumours were significantly greater than those in high-grade gliomas (p〈0.001). The Ki-67 labelling index and the mean number of NORs in malignant brain tumours including metastatic brain tumours were found to be linearly related (r=0.86). These results suggest that the proliferative potential of malignant brain tumours could be evaluated by NOR score as well as Ki-67 labelling index and that such indices provide clear discrimination between high-grade gliomas and metastatic brain tumours.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01405695
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Correlation between nucleolar organizer region score and bromodeoxyuridine labeling index in C6 glioma cell line (1991)
    Springer
    Journal of neuro-oncology 11 (1991), S. 149-155 
    Details
    ISSN: 1573-7373
    Keywords: BrdU-labeling index ; nucleolar organizer regions ; cyclic AMP ; C6 glioma cell ; proliferative potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Correlation between the mean number of nucleolar organizer region-associated argyrophilic proteins (AgNORs) per cell and BrdU labeling index (LI), the percentage of S-phase cells, was investigatedin vitro using rat C6 glioma cells under several different conditions such as increased concentration of fetal calf serum (FCS) in a stepwise manner in medium. In addition, the effect of dibutyryladenosine cyclic monophosphate (d-cAMP) on the mean number of AgNORs and the BrdU LI was examined. C6 glioma cells cultured with no FCS showed 5.1% BrdU LI and 3.46 AgNOR score. BrdU LI and AgNOR score of the cells cultured with 1% FCS were 26.5% and 6.25, respectively. Those with 5% FCS were 44.7% and 8.41, with 10% FCS; 49.8% and 10.85, and with 20% FCS; 48.4% and 10.64. Treatment of d-cAMP with 10% FCS induced morphological differentiation and reduced BrdU LI (9.4%) and AgNORs score (4.90), compared with C6 cells cultured in medium containing 10% FCS without d-cAMP. Thus, the BrdU LI and AgNOR score of the C6 cells cultured under several different concentration of FCS were shown to be well linearly related (r=0.97) and both values were decreased with morphological alteration of C6 glioma cells in the presence of 1 mM d-cAMP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02390174
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    Paper (German National Licenses)
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