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Gene expression analysis in inflammatory macrophages [batch1]

ABSTRACT: Gene expression analysis in inflammatory macrophages [batch1]

PROVIDER: PRJNA674655 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR12982947_1.fastq.gz	Fastqsanger.gz
	SRR12982947_2.fastq.gz	Fastqsanger.gz
	SRR12982948_1.fastq.gz	Fastqsanger.gz
	SRR12982948_2.fastq.gz	Fastqsanger.gz
	SRR12982949_1.fastq.gz	Fastqsanger.gz

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Project description:Pan-Hdac inhibitors (HDACi) are endowed with a potent anti-inflammatory activity, but the relative role of each of the eleven Hdac proteins sensitive to HDACi to the inflammatory gene expression program is unknown. Using an integrated genomic approach we found that Hdac3-deficient macrophages are unable to activate almost half of the inflammatory gene expression program when stimulated with lipopolysaccharide (LPS). A large part of the activation defect is due to loss of basal and LPS-inducible expression of IFNb, which in basal cells maintains Stat1 protein levels, and after stimulation acts in an autocrine/paracrine manner to promote a secondary wave of Stat1-dependent gene expression. We show that loss of Hdac3-mediated repression of nuclear receptors leads to hyperacetylation of thousands of genomic sites and associated gene derepression. The upregulation of the constitutively expressed prostaglandin endoperoxide synthase, Ptgs1 (Cox-1), has a causative role in the phenotype, since its chemical inhibition reverts the Ifnb activation defect. These data may have relevance for the use of selective Hdac inhibitors as anti-inflammatory agents. Gene expression profiles for bone marrow-derived macrophages from either HDAC3 +/- (wt) or HDAC3 -/- (KO). Cells were left untreated or challenged with lipopolysaccharide (LPS) for 4hrs. Each genotype-treatment combination was performed in triplicate.

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Project description:Ablative RT results in increased expression of CCL2 within the tumor microenvironment of pancreatic ductal adenocarcinoma (PDAC) and also increased recruitment of CD45+CD11b+Ly6Chi inflammatory monocytes/macrophages. This increase in CCL2 expression and recruitment of inflammatory monocytes/macrophages is a mechanism of resistance to the anti-tumor effects of ablative radiotherapy (RT). We used microarrays to study changes in gene expression patterns of inflammatory monocytes/macrophages sorted from the tumor microenvironment after ablative RT in a subcutenous model of pancreatic adenocarcinoma. From this, we identified 8 genes with an absolute fold change of expression equal to or greater than 2 with a false discovery rate equal to or less than 25 %. A pancreatic cancer tumor cell line derived from spontaneously arising tumors in KrasLSL-G12D/+, Trp53LSL-R172H/+, Pdx1-Cre (KPC) mice was subcutaneously implanted into 8 week old female C57BL/6 and allowed to grow for 14 days. After 14 days, 4 mice received 20 Gy of radiation, and 4 mice received a sham treatment. One day post treatment, tumors were harvested, and inflammatory monocytes/macrophages were isolated using flow sorting based on a surface expression phenotype of CD45+ CD11b+ Ly6Chi. From this cell population, total RNA was extracted for creation of cDNA and hybridization on Affymetrix microarrays. From the microarrays, a set of genes associated with radiation treatment of PDAC was identified.

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