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ERα and AP-1 coordinate transcription and tamoxifen response in ERα-positive breast cancer

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Homo sapiens

PROVIDER: GSE102412 | GEO | 2018/03/02

REPOSITORIES: GEO

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ERα and AP-1 coordinate transcription and tamoxifen response in ERα-positive breast cancer

Project description:ERα and AP-1 coordinate transcription and tamoxifen response in ERα-positive breast cancer

| PRJNA397705 | ENA

c-Jun/AP-1 overexpression reprograms ERα signaling related to tamoxifen response in ERα-positive breast cancer [ChIP-seq]

Project description:A critical mechanism for transcription regulation by estrogen receptor α (ER) is the tethering of ER to DNA via other transcription factors, such as AP-1. However, genome-wide assessment of the overlap in chromatin binding repertoires of these two transcription factors has not been reported. Here, we show that the AP-1 transcription factor c-Jun interacts with ER and is recruited globally to ER binding regions. Interestingly, we identify differential motif enrichment between unique ER binding regions and unique c-Jun binding regions, with FoxA1 motif enriched in both sets of binding regions, whereas GATA3 motif only specifically enriched in the unique ER binding regions but not in the unique Jun binding regions. We demonstrate that the primary mechanism for estrogen/ER-dependent transcriptional responses is the tethering of ER to DNA under conditions where it cooperates with AP-1. We provide evidence that c-Jun overexpression causes reduced sensitivity to tamoxifen in ER+ breast cancer cells. Integrated omics data reveal TGFBI as one of the most perturbed genes regulated by c-Jun. TGFBI knockdown suppresses the growth of breast cancer cells and is critical for increasing the sensitivity of tamoxifen-resistant cells to tamoxifen. We show that TGFBI expression is elevated in breast cancer than in normal breast and the basal-like tumors express high levels of TGFBI. TGFBI expression is associated with poor patient survival in ER+ breast cancer receiving endocrine therapy, highlighting a role of AP-1 via TGFBI signaling as a major determinant of endocrine response in ER+ breast tumor.

2018-03-02 | GSE102410 | GEO

c-Jun/AP-1 overexpression reprograms ERα signaling related to tamoxifen response in ERα-positive breast cancer [expression profiling]

Project description:A critical mechanism that has been proposed for transcription regulation by estrogen receptor α (ER) is the tethering of ER to DNA via other transcription factors, such as AP-1. However, genome-wide assessment of the overlap in chromatin binding repertoires of these two transcription factors has not been reported. Here, we show that the AP-1 transcription factor c-Jun interacts with ER and that c-Jun chromatin binding shows extensive overlap with ER binding at the global level. Further, we show that c-Jun overexpression reprograms ER chromatin binding and modulates ER-mediated gene regulation. Our data are consistent with a mechanism where estrogen/ER-dependent crosstalk with AP-1 at the transcriptional level is mediated through the tethering of ER to DNA bound AP-1. Additionally, in our system c-Jun overexpression causes reduced sensitivity to tamoxifen in ER+ breast cancer cells. Integrated cistrome, transcriptome, and clinical data reveal TGFBI as a candidate gene which may confer tamoxifen resistance by ER and AP-1 crosstalk. Further, we show that TGFBI expression is elevated in breast cancer compared to normal breast. Together, our data provide a novel genome-wide footprint of ER and AP-1 crosstalk and suggest AP-1 and TGFBI signaling as potential therapeutic targets in AP-1-overexpressing ER-positive breast tumors.

2018-03-02 | GSE102367 | GEO