Based on previous evidence indicating a selective cytotoxic activity of the mixed
phosphine gold complex
chlorotriphenylphosphine-1,3-bis(diphenylphosphino)propanegold(I) for
melanoma cells, we investigated the cellular bases of its antiproliferative effect in a panel of human
melanoma cell lines (JR8, SK-Mel-5, Mel-501, 2/60, 2/21 and GRIG). The
drug consistently induced a dose-dependent inhibition of cell growth, with IC50 values ranging from 0.8 to 2.3 microM and, when tested under the same experimental conditions, its cytotoxic activity was higher than (from 2- to 5-fold) or comparable to that of
cisplatin as a function of cell lines. The ability of the
gold complex to activate programmed cell death was assessed in JR8 and 2/60 cells, and a dose-dependent increase in cells with an apoptotic nuclear morphology was observed in both cell lines (up to 40 and 66% of the overall cell population, for JR8 and 2/60 cell lines, respectively). Such an apoptotic response was mediated by a dose-dependent loss of mitochondrial membrane potential,
cytochrome c and Smac/DIABLO release from mitochondria into cytosol and enhanced
caspase-9 and
caspase-3 catalytic activity. A reduced or completely abrogated expression of the
anti-apoptotic proteins c-IAP1, XIAP and
survivin in
drug-treated cells was also observed. Overall, results from the study indicate that
chlorotriphenylphosphine-1,3-bis(diphenylphosphino)propanegold(I) markedly inhibits
melanoma cell growth by inducing mitochondria-mediated apoptosis and suggest it as a good candidate for additional evaluation as an
anticancer agent against
melanoma.