Breast cancer is one of the most common cancers in humans and will on average affect up to one in eight women in their lifetime in the United States and Europe1. The Women’s Health Initiative and the Million Women Study have shown that hormone replacement therapy is associated with an increased risk of incident and fatal breast cancer2,3. In particular, synthetic progesterone derivatives (progestins) such as medroxyprogesterone acetate (MPA), used in millions of women for hormone replacement therapy and contraceptives, markedly increase the risk of developing breast cancer. Here we show that the in vivo administration of MPA triggers massive induction of the key osteoclast differentiation factor RANKL (receptor activator of NF-κB ligand) in mammary-gland epithelial cells. Genetic inactivation of the RANKL receptor RANK in mammary-gland epithelial cells prevents MPA-induced epithelial proliferation, impairs expansion of the CD49fhi stem-cell-enriched population, and sensitizes these cells to DNA-damage-induced cell death. Deletion of RANK from the mammary epithelium results in a markedly decreased incidence and delayed onset of MPA-driven mammary cancer. These data show that the RANKL/RANK system controls the incidence and onset of progestin-driven breast cancer.
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We thank all members of our laboratories for helpful discussions; G. Forni for providing NeuT transgenic mice. A.O.A. is a recipient of a Career Award for Medical Scientists from the Burroughs Wellcome Fund. L.G. is supported by National Institutes of Health (NIH) grant HD055601. G.S’s work is supported by the German Research Council (Deutsche Forschungsgemeinschaft (DFG): FOR643, SFB641 and SPP1468), by the Interdisciplinary Center for Clinical Sciences Erlangen and by the focus programme SPP1468 (Immunobone) of the DFG and the Masterswitch project of the European Union (EU). C.J.O. is supported by the National Health and Medical Research Council of Australia, the Australian Cancer Research Fund and the Cancer Institute New South Wales. D.S. is supported by the EU InflaCare network. M.W. is supported by a grant from the University College London (UCL) Hospital/UCL Comprehensive Biomedical Research Centre project no. 152, and part of this work was undertaken at UCL Hospital/UCL, which received a proportion of its funding from the Department of Health National Institute for Health Research Biomedical Research Centres funding scheme. J.M.P. is supported by grants from Institute of Molecular Biotechnology, the Austrian Ministry of Sciences, the Austrian Academy of Sciences, GEN-AU (AustroMouse), an EU Marie Curie Excellence Grant, and a European Research Council Advanced Grant. Special thanks go to Limin Zhang, who provided a first idea for this manuscript and died much too early of breast cancer.
This file contains Supplementary Text containing information on Rank detection in tumors and Cre effects and Gene expression profiling. The file also contains Supplementary Figures 1-16 with legends and additional references.
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Current Stem Cell Reports (2018)