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Hydrogen Peroxide Overproduced In Breast Cancer Cells Can Serve As An Anticancer Prodrug Generating Apoptosis‐stimulating Hydroxyl Radicals Under The Effect Of Tamoxifen‐ferrocene Conjugate
W. A. Wlassoff, C. Albright, Michael S Sivashinski, A. Ivanova, Jacob Appelbaum, Rudolph I Salganik
Published 2007 · Chemistry, Medicine
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A new approach to the treatment of cancer is suggested, based on the innate overproduction of hydrogen peroxide in cancer cells. Hydrogen peroxide serves as a prodrug in the presence of transition metal ions, such as iron delivered by ferrocene. Under the effect of ferrocene, hydrogen peroxide is split into hydroxyl anions and highly reactive hydroxyl radicals. The latter cause oxidative DNA damage, which induces apoptosis, leading to elimination of cancer cells. Tamoxifen, a drug that interacts with oestrogen receptors, was used as a carrier to deliver ferrocene to breast cancer cells. For this aim tamoxifen conjugated to ferrocene (Tam‐Fer) was synthesized. We have shown that the frequency of apoptotic events in MCF‐7 breast cancer cells treated with Tam‐Fer is significantly higher than in cells treated with tamoxifen or ferrocene separately. The increase of apoptosis correlates well with the rise in generation of reactive oxygen species in cancer cells. These results show that the hydrogen peroxide overproduced in tumour cells can serve as a prodrug for the treatment of cancer.
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