Open AccessCellular reprogramming by the conjoint action of ERα, FOXA1, and GATA3 to a ligand‐inducible growth state
Author(s) -
Kong Say Li,
Li Guoliang,
Loh Siang Lin,
Sung WingKin,
Liu Edison T
Publication year - 2011
Publication title -
molecular systems biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 8.523
H-Index - 148
ISSN - 1744-4292
DOI - 10.1038/msb.2011.59
Subject(s) - foxa1 , biology , gata3 , chromatin , transcription factor , estrogen receptor , enhancer , estrogen receptor alpha , reprogramming , cancer research , chromatin immunoprecipitation , microbiology and biotechnology , transfection , gene , genetics , promoter , gene expression , breast cancer , cancer
Despite the role of the estrogen receptor α (ERα) pathway as a key growth driver for breast cells, the phenotypic consequence of exogenous introduction of ERα into ERα‐negative cells paradoxically has been growth inhibition. We mapped the binding profiles of ERα and its interacting transcription factors (TFs), FOXA1 and GATA3 in MCF‐7 breast carcinoma cells, and observed that these three TFs form a functional enhanceosome that regulates the genes driving core ERα function and cooperatively modulate the transcriptional networks previously ascribed to ERα alone. We demonstrate that these enhanceosome occupied sites are associated with optimal enhancer characteristics with highest p300 co‐activator recruitment, RNA Pol II occupancy, and chromatin opening. Most importantly, we show that the transfection of all three TFs was necessary to reprogramme the ERα‐negative MDA‐MB‐231 and BT‐549 cells to restore the estrogen‐responsive growth resembling estrogen‐treated ERα‐positive MCF‐7 cells. Cumulatively, these results suggest that all the enhanceosome components comprising ERα, FOXA1, and GATA3 are necessary for the full repertoire of cancer‐associated effects of the ERα.