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Synergistic cytotoxic actions of cisplatin and liposomal valinomycin on human ovarian carcinoma cells

  • Original Articles
  • Cisplatin, Liposomal Valinomycin, Ovarian Carcinoma
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Summary

We have previously shown that the toxicity of valinomycin (VM), a membrane-active agent with antineo-plastic activity, can be dramatically reduced with no loss of the antitumor efficacy of the drug by incorporating it into liposomes. In the present study, we investigated the interaction betweencis-diamminedichloroplatinum(II) (CDDP) and VM in terms of in vitro cytotoxicity to human ovarian tumor cells. Using the MTT assay and analyzing the data using the median-effect principle, we showed that synergistic cytotoxic interactions exist between CDDP and VM in their liposomal form. The degree of cytotoxic synergism was influenced by the duration of drug exposure and the dose ratio. The cellular accumulation of platinum by ovarian cells at 37°C was slightly higher after exposure to VM as compared with controls; however, it is not clear that this accounts for the cytotoxic synergism. These results suggest that the combination of liposomal VM and CDDP may have merit as a form of localized drug delivery for the treatment of ovarian cancer disseminated within the peritoneal space.

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Abbreviations

CDDP:

cisplatin,cis-diamminedichloroplatinum(II)

VM:

valinomycin

MLV-VM:

liposomal valinomycin

MTT:

3-(4,5-dimethyl thiazol-2-yl)-2,5 diphenyl-tetrazolium bromide (thiazolyl blue)

alpha-MEM:

alpha minimal essential medium

CHO:

Chinese hamster ovary

IC50 :

concentration causing 50% inhibition of cell growth

IC10 :

concentration causing 10% inhibition of cell growth

SF:

surviving fraction

fa:

fraction affected

CI:

combination index

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Daoud, S.S., Forde, N.H. Synergistic cytotoxic actions of cisplatin and liposomal valinomycin on human ovarian carcinoma cells. Cancer Chemother. Pharmacol. 28, 370–376 (1991). https://doi.org/10.1007/BF00685692

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  • DOI: https://doi.org/10.1007/BF00685692

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