cis-Diamminedichloroplatinum(II)-induced cell death through apoptosis in sensitive and resistant human ovarian carcinoma cell lines

Cancer Chemotherapy and Pharmacology
M G OrmerodK R Harrap

Abstract

We have studied the effects of the chemotherapeutic drug cis-diamminedichloroplatinum(II) (cis-platin) on three human ovarian carcinoma cell lines - one sensitive to the drug (CH1), one with acquired resistance (CH1cisR) and one with intrinsic resistance (SKOV-3). Previous work has shown that the 50% inhibitory concentrations (IC50 values) after a 2-h exposure to the drug are: CH1, 2.5 microM; CH1cisR, 7.5 microM; and SKOV-3, 33 microM. Despite the variation in sensitivity, the amount of Pt bound to DNA and the rate of removal of Pt was similar for the three lines. There were significant differences in the rates of formation of DNA cross-links but these were not large enough to account for the high resistance of the SKOV-3 line. We have reported that in the L1210 murine leukaemia cell line there are two mechanisms of cisplatin-induced cell death - one of which involves apoptosis. In this paper, we report on an investigation into whether sensitivity to apoptosis played a role in the resistance of these ovarian lines toward cisplatin. After a 2-h incubation with the drug, cells from the three lines showed evidence of death through apoptosis. The cells detached from the culture dish in a time- and dose-dependent fashion. These cel...Continue Reading

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