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Gene expression change after JQ1 treatment in breast cancer cell

ABSTRACT: Gene expression change after JQ1 treatment in breast cancer cell

PROVIDER: PRJNA587994 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR10407312_1.fastq.gz	Fastqsanger.gz
	SRR10407312_2.fastq.gz	Fastqsanger.gz
	SRR10407313_1.fastq.gz	Fastqsanger.gz
	SRR10407313_2.fastq.gz	Fastqsanger.gz

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Gene expression change after JQ1 treatment in breast cancer cell

Project description:BET bromodomain inhibitors effectively kill several types of cancer cells. However, the underlying mechanism of BET inhibition resistance remains obscure. We sought to identify the gene expression change upon treatment of JQ1, a well-known BET inhibitor, in basal-like breast cancer cells. In this dataset, we used RNA-sequencing to characterize the mRNA expression profiles from DMSO and JQ1-treated MDA-MB-231 breast tumor cells.

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Kinetics after JQ1 treatment in liver cancer cell

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Human basal-like breast cancer cell line HCC1143 treated with BET inhibitor JQ1 in combination with MEK inhibitor Trametinib or PI3K/mTOR inhibitor BEZ235

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Project description:Bromodomain and extra terminal domain (BET) proteins are important epigenetic regulators facilitating the transcription of genes in chromatin areas linked to acetylated histones. JQ1, a BET protein inhibitor, has antiproliferative activity against many cancers, mainly through inhibition of c-MYC and upregulation of p21. In this research, we investigated the use of JQ1 for human osteosarcoma (OS) treatment. JQ1 significantly inhibited the proliferation and survival of OS cells inducing G1 cell cycle arrest, premature senescence, but little effect on apoptosis. Interestingly, c-MYC protein levels in JQ1-treated cells remained unchanged, whereas the upregulation of p21 protein was still observable. Although effective in vitro, JQ1 alone failed to reduce the size of the MNNG/HOS xenografts in immunocompromised mice. To overcome the resistance of OS cells to JQ1 treatment, we combined JQ1 with rapamycin, an mTOR inhibitor. JQ1 and rapamycin synergistically inhibited the growth and survival of OS cells in vitro and in vivo. We also identified that RUNX2 is a direct target of BRD4 inhibition by JQ1 in OS cells. Chromatin immunoprecipitation (ChIP) showed that enrichment of BRD4 protein around RUNX2 transcription start sites diminished with JQ1 treatment in MNNG/HOS cells. Overexpression of RUNX2 protected JQ1-sensitive OS cells from the effect of JQ1, and siRNA-mediated inhibition of RUNX2 sensitized the same cells to JQ1. In conclusion, our findings suggest that JQ1, in combination with rapamycin, is an effective chemotherapeutic option for OS treatment. We also show that inhibition of RUNX2 expression by JQ1 partly explains antiproliferative activity of JQ1 in OS cells.

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