期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 110, 期 16, 页码 E1490-E1499出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1219992110
关键词
open chromatin; histone modification; drug resistance; epigenetic; transcriptional regulation
资金
- National Cancer Institute [R01CA155004]
- American Cancer Society [IRG-82-003-27]
- Princess Margaret Foundation
The estrogen receptor (ER)alpha drives growth in two-thirds of all breast cancers. Several targeted therapies, collectively termed endocrine therapy, impinge on estrogen-induced ER alpha activation to block tumor growth. However, half of ER alpha-positive breast cancers are tolerant or acquire resistance to endocrine therapy. We demonstrate that genome-wide reprogramming of the chromatin landscape, defined by epigenomic maps for regulatory elements or transcriptional activation and chromatin openness, underlies resistance to endocrine therapy. This annotation reveals endocrine therapy-response specific regulatory networks where NOTCH pathway is overactivated in resistant breast cancer cells, whereas classical ER alpha signaling is epigenetically disengaged. Blocking NOTCH signaling abrogates growth of resistant breast cancer cells. Its activation state in primary breast tumors is a prognostic factor of resistance in endocrine treated patients. Overall, our work demonstrates that chromatin landscape reprogramming underlies changes in regulatory networks driving endocrine therapy resistance in breast cancer.
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