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• W2046779989 abstract "The results presented here demonstrate that a cis-diamminedichloroplatinum(II) (DDP)-resistant human ovarian-carcinoma cell line is also cross-resistant to the spermine analogue N1,N12-bis(ethyl)spermine (BESPM). We report that C13* cells, which are approximately 20-fold resistant to DDP, similarly showed 7-fold resistance to BESPM by colony-forming assay with an IC50 value of 24.6 +/- 2 microM vs. 3.4 +/- 0.8 microM of 2008 cells. Resistance appears to be the result of many effects, such as different morphological and functional modifications of mitochondria. Furthermore, although BESPM accumulation was almost identical in sensitive and resistant cells, the intracellular polyamine pool of the 2 cell lines was differentially affected by this polyamine analogue. In fact, when spermidine (SPD) was still detectable in C13* cells, in 2008 cells it was not, and the spermine (SPM) content was always more markedly reduced in sensitive cells than in the resistant variant. The lower polyamine content of 2008 cells could be related to a higher degree of induction of spermidine/ spermine N1-acetyltransferase (SSAT) activity by BESPM in sensitive cells than in their resistant counterpart. Despite the observed cross-resistance, the combination of the 2 drugs resulted in supra-additive and synergistic effects in both cell lines, depending on concentration, as assessed by median-effect analysis of the survival data. The effectiveness of this combination was also confirmed by the increased accumulation of cells in the G2/M phase of the cell cycle in both cell lines. Taken together, these data suggest that BESPM effect on cell growth of DDP-sensitive and DDP-resistant cells involves multiple mechanisms that are differently modulated by the DDP-resistant phenotype." @default.
• W2046779989 created "2016-06-24" @default.
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• W2046779989 date "1998-09-25" @default.
• W2046779989 modified "2023-09-26" @default.
• W2046779989 title "N1,N12-bis(ethyl)spermine effect on growth ofcis-diamminedichloroplatinum(II)-sensitive and -resistant human ovarian-carcinoma cell lines" @default.
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• W2046779989 doi "https://doi.org/10.1002/(sici)1097-0215(19980925)78:1<33::aid-ijc7>3.0.co;2-y" @default.
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