Abstract
Cisplatin (cis), raceme-diaqua[1,2-bis(4-fluorophenyl)ethylenedi-amine]platinum(II) sulfate (r-4F-PtSO4), meso-diaqua[1,2-bis(4-fluorophenyl)ethylenediamine]platinum(II) sulfate (m-4F-PtSO4), and meso-diaqua[1,2-bis(2,6-dichloro-4-hydroxyphenyl)ethylenediamine]platinum(II) sulfate (m-2,6Cl2-4OH-PtSO4) were compared with regard to their growth inhibitory effect on MCF-7 breast cancer cells. At concentrations of 5 μM, cis, r-4F-PtSO4, and m-4F-PtSO4 were essentially equiactive, whereas m-2,6Cl2-4OH-PtSO4 was ineffective. Platinum measurements by neutron activation analysis showed that a 24-h treatment of the MCF-7 cells with r-4F-PtSO4 and m-4F-PtSO4 caused a 22.3- and 10.3-fold accumulation, respectively, whereas the accumulation factors for cis (2.55) and m-2,6Cl2-4OH-PtSO4 (1.83) were very low. The comparison of DNA-associated platinum revealed a similar tendency. After 24 h of drug exposure, the base pair/platinum ratios were: 2.1·104 for r-4F-PtSO4, 3.7·104 for m-4F-PtSO4, 6.1·104 for cisplatin, and 8.1·104 for m-2,6Cl2-4OH-PtSO4. Thus, the grade of cytotoxicity was correlated neither with the extent of cellular platinum enrichment nor with the degree of genomic DNA platination.
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Lux, F., Hollstein, M., Reile, H. et al. Discrepancy between cytotoxicity, platinum accumulation, and DNA platination in MCF-7 breast cancer cells treated with diaqua(1,2-diphenylethylenediamine) platinum(II) sulfates and cisplatin. Biol Trace Elem Res 53, 113–128 (1996). https://doi.org/10.1007/BF02784549
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DOI: https://doi.org/10.1007/BF02784549