ISSN:
1573-7373
Keywords:
2-5A synthetase
;
astrocyte
;
cancer
;
cell cycle
;
cell death
;
flow cytometry
;
glioblastoma multiforme
;
glioma
;
interferon
;
recurrent tumor
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary The growth inhibitory effect of IFN-β was evaluated in 5 human glioma cell lines (AO2V4, GJC, GJR, NN and NNR) and in normal astrocyte cultures (SC and TM). All 5 glioma cell lines showed an anti-proliferative response to IFN-β whereas normal glial cells were non-responsive. IFN-β at 10, 100 and 500 U/ml lead to a 30%,70% and 80% relative decrease in cell number after 12 days, respectively in AO2V4 cells. GJC and GJR cell lines also responded significantly to the lowest concentration of IFN-β tested and at 500 U/ml the relative cell number decreased 55%. The NN and NNR cells were the least responsive to IFN-β with maximum growth inhibition of 30% at 500 U IFN-β/ml. Following treatment with IFN-β, AO2V4, GJC, GJR and normal astrocytes all expressed mRNA encoding the anti-viral protein, 2-5A synthetase demonstrating that IFN-β bound to receptors on all four cell lines and activated signal transduction pathways required for induction of an anti-viral protein. A determination of the relative number of viable cells showed that none of these cells exhibited a significant decrease in cell viability. Since the antiproliferative response to IFN-β was not primarily due to cell death, the effect of IFN-β on cell cycle progression was evaluated by flow cytometry. All treated glioma cell lines showed a relative increase in proportion of cells in S phase. AO2V4 cells had a 50%–80% increase in the percentage of cells in S phase, whereas GJC, GJR and NNR had percentage increases of 20%–40%. IFN-β treatment of normal astrocytes did not significantly alter their cell cycle profile. These data suggest that IFN-β exerts its antiproliferative effect on glioma cells by arresting the ordered progression through S phase or decreasing entry into G2/M phase of the cell cycle.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00177272
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