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• W2023243044 abstract "Cardiac glycosides such as digitoxin and ouabain have previously been shown to be selectively cytotoxic to tumor as opposed to normal cells. Moreover, this class of agents has also been shown to act as potent radiosensitizers. In the present study we explored the relative radiosensitization potential of oleandrin, a cardiac glycoside contained within the plant extract known as Anvirzel™ that recently underwent a Phase I trial as a novel drug for anticancer therapy. The data show that oleandrin produces an enhancement of sensitivity of PC-3 human prostate cells to radiation; at a cell survival of 0.1, the enhancement factor was 1.32. The magnitude of radiosensitization depended on duration of exposure of cells to drug prior to radiation treatment. While a radiosensitizing effect of oleandrin was evident with only 1 h of cell exposure to drug, the effect greatly increased with 24 h oleandrin pretreatment. Susceptibility of PC-3 cells to oleandrin and radiation-induced apoptosis was dependent on activation of caspase-3. Activation was greatest when cells were exposed simultaneously to oleandrin and radiation. Inhibition of caspase-3 activation with Z-DEVD-FMK abrogated the oleandrin-induced enhancement of radiation response suggesting that both oleandrin and radiation share a caspase-3 dependent mechanism of apoptosis in the PC-3 cell line." @default.
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• W2023243044 date "2002-11-01" @default.
• W2023243044 modified "2023-10-17" @default.
• W2023243044 title "Enhancement of radiotherapy by oleandrin is a caspase-3 dependent process" @default.
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• W2023243044 doi "https://doi.org/10.1016/s0304-3835(02)00263-x" @default.
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