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N 1 ,N 12 ‐bis(ethyl)spermine effect on growth of cis ‐diamminedichloroplatinum(II)‐sensitive and ‐resistant human ovarian‐carcinoma cell lines
Author(s) -
Marverti Gaetano,
Piccinini Giorgio,
Ghiaroni Stefania,
Barbieri Daniela,
Quaglino Daniela,
Moruzzi Maria Stella
Publication year - 1998
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/(sici)1097-0215(19980925)78:1<33::aid-ijc7>3.0.co;2-y
Subject(s) - spermine , ovarian carcinoma , cell culture , growth inhibition , cancer research , ovarian cancer , chemistry , biology , medicine , biochemistry , genetics , cancer , enzyme
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 N 1 ,N 12 ‐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 IC 50 value of 24.6 ± 2 μM vs. 3.4 ± 0.8 μM 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 N 1 ‐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 G 2 /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. Int. J. Cancer 78:33–40, 1998.© 1998 Wiley‐Liss, Inc.