Abstract
Here we report a novel potential therapeutic strategy using histone deacetylase (HDAC) inhibitors to enhance the action of hormonal therapy agents in estrogen receptor alpha (ERα)-positive breast cancer. HDAC inhibitors [trichostatin A (TSA), suberoylanilide hydroxamic acid (SAHA) and valproic acid (VPA)], inhibited proliferation of MCF-7 breast cancer cells and, in combination with tamoxifen inhibited proliferation better than with either agent alone. VPA, an anti-convulsant drug with HDAC inhibitory activity, enhanced tamoxifen action at doses within the concentration range used for anti-convulsive therapy. VPA cooperated with tamoxifen in a variety of ERα-positive cell lines and was also effective when combined with other antiestrogens, and with aromatase inhibition. VPA enhanced antiestrogen action by promoting cell death via apoptosis without affecting cell cycling. Some of this action may be due to VPA’s ability to induce the pro-apoptotic gene Bik, which is also induced by antiestrogens. Remarkably, VPA blocked the undesirable pro-proliferative action of tamoxifen on uterine endometrial cells. Our in vitro results suggest that VPA and other HDAC inhibitors have the potential to enhance hormonal therapy for ERα-positive breast cancer and simultaneously reverse the adverse effects of antiestrogens in the uterus.
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Acknowledgments
We would particularly like to thank Dr. Fred Schaufele for the careful reading of this manuscript and thoughtful suggestions. We also thank Marianna Zavodoskaya, Paul Webb, John Baxter, Michael Campbell, Ira Goldfine, and Jack Youngren for helpful discussions. Financial support was provided by the National Cancer Institute, NIH R01 CA 80210 (PJK) and the California Breast Cancer Research Project, 10FB-0046 (LHG). Peter Kushner has significant financial interests in, and is a former Director and Consultant to, Karobio AB a biotech company that develops ligands for nuclear receptors.
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Hodges-Gallagher, L., Valentine, C.D., Bader, S.E. et al. Inhibition of histone deacetylase enhances the anti-proliferative action of antiestrogens on breast cancer cells and blocks tamoxifen-induced proliferation of uterine cells. Breast Cancer Res Treat 105, 297–309 (2007). https://doi.org/10.1007/s10549-006-9459-6
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DOI: https://doi.org/10.1007/s10549-006-9459-6