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• W1930542562 abstract "BACKGROUND Intracellular Zn2+ levels decrease during prostate cancer progression and agents that modulate intracellular Zn2+ are cytotoxic to prostate cancer cells by an incompletely described mechanism. F10 is a new polymeric fluoropyrimidine drug-candidate that displays strong activity with minimal systemic toxicity in pre-clinical models of prostate cancer and other malignancies. The effects of exogenous Zn2+ or Zn2+ chelation for enhancing F10 cytotoxicity are investigated as is the role of Omi/HtrA2, a serine protease that promotes apoptosis in response to cellular stress. METHODS To test the hypothesis that the pro-apoptotic effects of F10 could be enhanced by modulating intracellular Zn2+ we investigated cell-permeable and cell-impermeable Zn2+ chelators and exogenous Zn2+ and evaluated cell viability and apoptosis in cellular models of castration-resistant prostate cancer (CRPC; PC3, C4–2). The role of Omi/HtrA2 for modulating apoptosis was evaluated by pharmacological inhibition and Western blotting. RESULTS Exogenous Zn2+ initially reduced prostate cancer cell viability but these effects were transitory and were ineffective at enhancing F10 cytotoxicity. The cell-permeable Zn2+-chelator tetrakis-(2-pyridylmethl) ethylenediamine (TPEN) induced apoptosis in prostate cancer cells and enhanced the pro-apoptotic effects of F10. The pro-apoptotic effects of Zn2+-chelation in combination with F10 treatment were enhanced by inhibiting Omi/HtrA2 implicating this serine protease as a novel target for prostate cancer treatment. CONCLUSIONS Zn2+-chelation enhances the pro-apoptotic effects of F10 and may be useful for enhancing the effectiveness of F10 for treatment of advanced prostate cancer. The serine protease Omi/HtrA2 modulates Zn2+-dependent apoptosis in prostate cancer cells and represents a new target for treatment of CRPC. Prostate 75:360–369, 2015. © 2014 Wiley Periodicals, Inc." @default.
• W1930542562 created "2016-06-24" @default.
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• W1930542562 date "2014-11-18" @default.
• W1930542562 modified "2023-09-26" @default.
• W1930542562 title "The cytotoxic and pro-apoptotic activities of the novel fluoropyrimidine F10 towards prostate cancer cells are enhanced by Zn²⁺ -chelation and inhibiting the serine protease Omi/HtrA2" @default.
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• W1930542562 doi "https://doi.org/10.1002/pros.22922" @default.
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