| Literature DB >> 27791031 |
Xiaoyong Fu1, Rinath Jeselsohn2, Resel Pereira1, Emporia F Hollingsworth3, Chad J Creighton4, Fugen Li2, Martin Shea5, Agostina Nardone5, Carmine De Angelis5, Laura M Heiser6, Pavana Anur7, Nicholas Wang6, Catherine S Grasso6, Paul T Spellman7, Obi L Griffith8, Anna Tsimelzon5, Carolina Gutierrez3, Shixia Huang9, Dean P Edwards10, Meghana V Trivedi11, Mothaffar F Rimawi5, Dolores Lopez-Terrada3, Susan G Hilsenbeck5, Joe W Gray6, Myles Brown2, C Kent Osborne12, Rachel Schiff13.
Abstract
Forkhead box protein A1 (FOXA1) is a pioneer factor of estrogen receptor α (ER)-chromatin binding and function, yet its aberration in endocrine-resistant (Endo-R) breast cancer is unknown. Here, we report preclinical evidence for a role of FOXA1 in Endo-R breast cancer as well as evidence for its clinical significance. FOXA1 is gene-amplified and/or overexpressed in Endo-R derivatives of several breast cancer cell line models. Induced FOXA1 triggers oncogenic gene signatures and proteomic profiles highly associated with endocrine resistance. Integrated omics data reveal IL8 as one of the most perturbed genes regulated by FOXA1 and ER transcriptional reprogramming in Endo-R cells. IL-8 knockdown inhibits tamoxifen-resistant cell growth and invasion and partially attenuates the effect of overexpressed FOXA1. Our study highlights a role of FOXA1 via IL-8 signaling as a potential therapeutic target in FOXA1-overexpressing ER-positive tumors.Entities:
Keywords: FOXA1; breast cancer; endocrine resistance; estrogen receptor; transcriptional reprogramming
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Year: 2016 PMID: 27791031 PMCID: PMC5087040 DOI: 10.1073/pnas.1612835113
Source DB: PubMed Journal: Proc Natl Acad Sci U S A ISSN: 0027-8424 Impact factor: 11.205