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Glucocorticoid Receptor Action in Breast Cancer [ChIP-Seq]

ABSTRACT: Glucocorticoid Receptor Action in Breast Cancer [ChIP-Seq]

PROVIDER: PRJNA923381 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR23071674.fastq.gz	Fastqsanger.gz
	SRR23071675.fastq.gz	Fastqsanger.gz
	SRR23071676.fastq.gz	Fastqsanger.gz
	SRR23071677.fastq.gz	Fastqsanger.gz
	SRR23071678.fastq.gz	Fastqsanger.gz

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Glucocorticoid Receptor Action in Breast Cancer [ChIP-Seq]

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Project description:Glucocorticoids (GC) have been widely used as coadjuvants in the treatment of solid tumors, but GC treatment may be associated with poor pharmacotherapeutic response and/or prognosis. The genomic action of GC in these tumors is largely unknown. Here we find that dexamethasone (Dex, a synthetic GC) regulated genes in triple-negative breast cancer (TNBC) cells are associated with drug resistance. Importantly, these GC-regulated genes are aberrantly expressed in TNBC patients and associated with unfavorable clinical outcomes. Interestingly, in TNBC cells, Compound A (CpdA, a selective GR modulator) only regulates a small number of genes not involved in carcinogenesis and therapy resistance. Mechanistic studies using a ChIP-exo approach reveal that Dex- but not CpdA-liganded glucocorticoid receptor (GR) binds to a single glucocorticoid response element (GRE), which drives the expression of pro-tumorigenic genes. Our data suggest that development of safe coadjuvant therapy should consider the distinct genomic function between Dex- and CpdA-liganded GR. To study GR-regulated genes and define GRE in human genome, RNA-seq and GR ChIP-exo are performed in MDA-MB-231 cells before/after dex and CpdA stimulation. Each experiment includes two replicates.

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Project description:The glucocorticoid receptor (GR) is a nuclear hormone receptor critical to the regulation of energy metabolism and the inflammatory response. The actions of GR have been shown to be highly dependent on context. Here, we performed GR ChIP-seq in mouse liver to demonstrate the necessity for liver lineage-determining factor hepatocyte nuclear factor 4A (HNF4A) in defining tissue-specificity of GR action. In normal liver, the HNF4 motif lies adjacent to the glucocorticoid response element (GRE) at GR binding sites found within regions of open chromatin. In the absence of HNF4A, the liver GR cistrome is remodelled, with both loss and gain of GR recruitment evident. Lost sites are characterised by HNF4 motifs and weak GRE motifs. Gained sites are characterised by strong GRE motifs, and typically show GR recruitment in non-liver tissues. The functional importance of these HNF4A-regulated GR sites is further demonstrated by evidence of an altered transcriptional response to glucocorticoid treatment in the Hnf4a-null liver.

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