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The ets transcription factor ELF5 suppresses the estrogen sensitive phenotype and contributes to antiestrogen resistance in luminal breast cancer. [human]

ABSTRACT: The ets transcription factor ELF5 specifies the differentiation of mammary progenitor cells to establish the milk-secreting lineage. ER- and poor prognosis basal breast cancers arise from this progenitor cell and these cancers express high levels of Elf5. Knockdown of ELF5 expression in basal breast cancer cell lines, or forced expression in luminal breast cancer cell lines, resulted in reduced cell proliferation. Transcript profiling and chromatin immunoprecipitation revealed that the transcriptional activity of ELF5 specified the gene expression patterns that distinguish basal from luminal breast cancer, including suppression of FOXA1, GATA3 and ER, key estrogen-action genes. Tamoxifen treatment of luminal MCF7 cells upregulated Elf5 expression and cells that acquired resistance to Tamoxifen became dependent on ELF5 for proliferation. ELF5 is a regulator of breast cancer cell proliferation, transcriptionally specifies the basal molecular subtype and is utilised by ER+ breast cancer cells to escape proliferative arrest caused by Tamoxifen. Elf5 was knocked down via siRNA in basal HCC1937 cell lines, in triplicate. Elf5 was induced in luminal T47D and MCF7 cell lines via a doxycycline inducible expression vector, in duplicate.

ORGANISM(S): Homo sapiens

SUBMITTER: Cowley Mark

PROVIDER: S-ECPF-GEOD-30405 | biostudies-other |

REPOSITORIES: biostudies-other

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The ets transcription factor ELF5 suppresses the estrogen sensitive phenotype and contributes to antiestrogen resistance in luminal breast cancer.

Project description:This SuperSeries is composed of the SubSeries listed below. Refer to individual Series

2012-12-27 | E-GEOD-30407 | biostudies-arrayexpress

The ets transcription factor ELF5 suppresses the estrogen sensitive phenotype and contributes to antiestrogen resistance in luminal breast cancer.

Project description:This SuperSeries is composed of the SubSeries listed below.

2012-12-27 | GSE30407 | GEO

The ets transcription factor ELF5 suppresses the estrogen sensitive phenotype and contributes to antiestrogen resistance in luminal breast cancer. [mouse]

Project description:The ets transcription factor ELF5 specifies the differentiation of mammary progenitor cells to establish the milk-secreting lineage. ER- and poor prognosis basal breast cancers arise from this progenitor cell and these cancers express high levels of Elf5. Knockdown of ELF5 expression in basal breast cancer cell lines, or forced expression in luminal breast cancer cell lines, resulted in reduced cell proliferation. Transcript profiling and chromatin immunoprecipitation revealed that the transcriptional activity of ELF5 specified the gene expression patterns that distinguish basal from luminal breast cancer, including suppression of FOXA1, GATA3 and ER, key estrogen-action genes. Tamoxifen treatment of luminal MCF7 cells upregulated Elf5 expression and cells that acquired resistance to Tamoxifen became dependent on ELF5 for proliferation. ELF5 is a regulator of breast cancer cell proliferation, transcriptionally specifies the basal molecular subtype and is utilised by ER+ breast cancer cells to escape proliferative arrest caused by Tamoxifen. Elf5 was induced via doxycycline treated PyMT mouse tumours, in triplicate

2014-01-13 | E-GEOD-30406 | biostudies-arrayexpress

The ets transcription factor ELF5 suppresses the estrogen sensitive phenotype and contributes to antiestrogen resistance in luminal breast cancer. [human]

Project description:The ets transcription factor ELF5 specifies the differentiation of mammary progenitor cells to establish the milk-secreting lineage. ER- and poor prognosis basal breast cancers arise from this progenitor cell and these cancers express high levels of Elf5. Knockdown of ELF5 expression in basal breast cancer cell lines, or forced expression in luminal breast cancer cell lines, resulted in reduced cell proliferation. Transcript profiling and chromatin immunoprecipitation revealed that the transcriptional activity of ELF5 specified the gene expression patterns that distinguish basal from luminal breast cancer, including suppression of FOXA1, GATA3 and ER, key estrogen-action genes. Tamoxifen treatment of luminal MCF7 cells upregulated Elf5 expression and cells that acquired resistance to Tamoxifen became dependent on ELF5 for proliferation. ELF5 is a regulator of breast cancer cell proliferation, transcriptionally specifies the basal molecular subtype and is utilised by ER+ breast cancer cells to escape proliferative arrest caused by Tamoxifen. Elf5 was knocked down via siRNA in basal HCC1937 cell lines, in triplicate. Elf5 was induced in luminal T47D and MCF7 cell lines via a doxycycline inducible expression vector, in duplicate.

2012-12-27 | E-GEOD-30405 | biostudies-arrayexpress

The ets transcription factor ELF5 suppresses the estrogen sensitive phenotype and contributes to antiestrogen resistance in luminal breast cancer. [human]

2012-12-27 | GSE30405 | GEO

The ets transcription factor ELF5 suppresses the estrogen sensitive phenotype and contributes to antiestrogen resistance in luminal breast cancer. [mouse]

2014-01-13 | GSE30406 | GEO

The ets transcription factor ELF5 suppresses the estrogen sensitive phenotype and contributes to antiestrogen resistance in luminal breast cancer. [human ChIP-Seq]

Project description:The ets transcription factor ELF5 specifies the differentiation of mammary progenitor cells to establish the milk-secreting lineage. ER- and poor prognosis basal breast cancers arise from this progenitor cell and these cancers express high levels of Elf5. Knockdown of ELF5 expression in basal breast cancer cell lines, or forced expression in luminal breast cancer cell lines, resulted in reduced cell proliferation. Transcript profiling and chromatin immunoprecipitation revealed that the transcriptional activity of ELF5 specified the gene expression patterns that distinguish basal from luminal breast cancer, including suppression of FOXA1, GATA3 and ER, key estrogen-action genes. Tamoxifen treatment of luminal MCF7 cells upregulated Elf5 expression and cells that acquired resistance to Tamoxifen became dependent on ELF5 for proliferation. ELF5 is a regulator of breast cancer cell proliferation, transcriptionally specifies the basal molecular subtype and is utilised by ER+ breast cancer cells to escape proliferative arrest caused by Tamoxifen. ChIP-Seq using an antibody to ELF5, in T47D breast carcinoma cell lines

2012-12-27 | E-GEOD-31216 | biostudies-arrayexpress

The ets transcription factor ELF5 suppresses the estrogen sensitive phenotype and contributes to antiestrogen resistance in luminal breast cancer. [human ChIP-Seq]

2012-12-27 | GSE31216 | GEO

ELF5 suppresses estrogen sensitivity and underpins the acquisition of antiestrogen resistance in luminal breast cancer.

Project description:We have previously shown that during pregnancy the E-twenty-six (ETS) transcription factor ELF5 directs the differentiation of mammary progenitor cells toward the estrogen receptor (ER)-negative and milk producing cell lineage, raising the possibility that ELF5 may suppress the estrogen sensitivity of breast cancers. To test this we constructed inducible models of ELF5 expression in ER positive luminal breast cancer cells and interrogated them using transcript profiling and chromatin immunoprecipitation of DNA followed by DNA sequencing (ChIP-Seq). ELF5 suppressed ER and FOXA1 expression and broadly suppressed ER-driven patterns of gene expression including sets of genes distinguishing the luminal molecular subtype. Direct transcriptional targets of ELF5, which included FOXA1, EGFR, and MYC, accurately classified a large cohort of breast cancers into their intrinsic molecular subtypes, predicted ER status with high precision, and defined groups with differential prognosis. Knockdown of ELF5 in basal breast cancer cell lines suppressed basal patterns of gene expression and produced a shift in molecular subtype toward the claudin-low and normal-like groups. Luminal breast cancer cells that acquired resistance to the antiestrogen Tamoxifen showed greatly elevated levels of ELF5 and its transcriptional signature, and became dependent on ELF5 for proliferation, compared to the parental cells. Thus ELF5 provides a key transcriptional determinant of breast cancer molecular subtype by suppression of estrogen sensitivity in luminal breast cancer cells and promotion of basal characteristics in basal breast cancer cells, an action that may be utilised to acquire antiestrogen resistance.

| S-EPMC3531499 | biostudies-literature

Notch3 Maintains Luminal Phenotype and Suppresses Tumorigenesis and Metastasis of Breast Cancer via Trans-Activating Estrogen Receptor-?.

Project description:The luminal A phenotype is the most common breast cancer subtype and is characterized by estrogen receptor ? expression (ER?). Identification of the key regulator that governs the luminal phenotype of breast cancer will clarify the pathogenic mechanism and provide novel therapeutic strategies for this subtype of cancer. ER? signaling pathway sustains the epithelial phenotype and inhibits the epithelial-mesenchymal transition (EMT) of breast cancer. In this study, we demonstrate that Notch3 positively associates with ER? in both breast cancer cell lines and human breast cancer tissues. We found that overexpression of Notch3 intra-cellular domain, a Notch3 active form (N3ICD), in ER? negative breast cancer cells re-activated ER?, while knock-down of Notch3 reduced ER? transcript and proteins, with alteration of down-stream genes, suggesting its ability to regulate ER?. Mechanistically, our results show that Notch3 specifically binds to the CSL binding element of the ER? promoter and activates ER? expression. Moreover, Notch3 suppressed EMT, while suppression of Notch3 promoted EMT in cellular assay. Overexpressing N3ICD in triple-negative breast cancer suppressed tumorigenesis and metastasis in vivo. Conversely, depletion of Notch3 in luminal breast cancer promoted metastasis in vivo. Furthermore, Notch3 transcripts were significantly associated with prolonged relapse-free survival in breast cancer, in particular in ER? positive breast cancer patients. Our observations demonstrate that Notch3 governs the luminal phenotype via trans-activating ER? expression in breast cancer. These findings delineate the role of a Notch3/ER? axis in maintaining the luminal phenotype and inhibiting tumorigenesis and metastasis in breast cancer, providing a novel strategy to re-sensitize ER? negative or low-expressing breast cancers to hormone therapy.

| S-EPMC5667424 | biostudies-literature

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