Abstract
The aim of this work was to investigate the mechanism of action of ferrocifen (Fc-OH-TAM), the ferrocenyl analog of 4-hydroxy-tamoxifen (OH-TAM), which is the active metabolite of tamoxifen, the drug most widely prescribed for treatment of hormone-dependent breast cancers. Fc-OH-TAM showed an anti-proliferative effect on the six breast cancer cell lines tested, 3 ERalpha positive (MCF-7, T-47D, ZR-75-1) and 3 ERalpha negative (MDA-MB-231, SKBR-3, Hs578-T) whatever their ER (estrogen receptor) status. However, the mechanism of action of the ferrocenyl derivative appeared to differ depending on the status of the ERalpha. Analysis of cell cycle distribution revealed that Fc-OH-TAM first recruits cells in the S phase in both ERalpha positive and ERalpha negative cells. In the presence of ERalpha, Fc-OH-TAM allowed cell cycle progression, with a subsequent blockade in G0/G1, whereas in the absence of ERalpha, cells remained in the S phase. Significant production of ROS was observed only in the presence of Fc-OH-TAM in both ERalpha positive and negative breast cancer cell lines. Within our experimental conditions, this ROS production is associated with cell cycle arrest and senescence rather than apoptosis. In the presence of ERalpha...Continue Reading
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