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Extensive epigenomic integration of the glucocorticoid response in primary human monocytes and in vitro derived macrophages

ABSTRACT: Extensive epigenomic integration of the glucocorticoid response in primary human monocytes and in vitro derived macrophages

PROVIDER: PRJNA430882 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6497240.fastq.gz	Fastqsanger.gz
	SRR6497250_1.fastq.gz	Fastqsanger.gz
	SRR6497250_2.fastq.gz	Fastqsanger.gz
	SRR6497260_1.fastq.gz	Fastqsanger.gz
	SRR6497260_2.fastq.gz	Fastqsanger.gz

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Extensive epigenomic integration of the glucocorticoid response in primary human monocytes and in vitro derived macrophages

Project description:Glucocorticoid receptor is a transcription factor that is ubiquitously expressed. Glucocorticoids are circadian steroids that regulate a wide range of bodily functions, including immunity. Here we report that synthetic glucocorticoids affect 1035 mRNAs in isolated healthy human blood monocytes but only 165 in the respective six day-old monocyte-derived macrophages. The majority of the glucocorticoid response in monocytes concerns genes that are dynamic upon monocyte to macrophage differentiation, whereby macrophage-like mRNA levels are often reached in monocytes within four hours of treatment. Concomitantly, over 5000 chromosomal H3K27ac regions undergo remodelling, of which 60% involve increased H3K27ac signal. We find that chromosomal glucocorticoid receptor binding sites correlate with positive but not with negative local epigenomic effects. To investigate further we assigned our data to topologically associating domains (TADs). This shows that about 10% of macrophage TADs harbour at least one GR binding site and that half of all the glucocorticoid-induced H3K27ac regions are confined to these TADs. Our analyses are therefore consistent with the notion that TADs naturally accommodate information from sets of distal glucocorticoid response elements.

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Extensive epigenomic integration of the glucocorticoid response in primary human monocytes and in vitro derived macrophages.

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Project description:Glucocorticoids (GC) are used as first line therapies for generalized suppression of inflammation (e.g. allergies or autoimmune diseases), but their long-term use is limited by severe side effects. Our previous work has revealed that GC induced a stable anti-inflammatory phenotype in monocytes, the glucocorticoid-stimulated monocytes (GCsM) that we now exploited for targeted GC-mediated therapeutic effects. We demonstrate that GCsM interact with T-cells in suppressing proliferation as well as cytokine release of CD8+ and especially CD4+ T-cells in vitro, and that they support generation of Foxp3+ cells. We therefore tested their immunosuppressive potential in CD4+ T-cell-induced colitis in vivo. We found that injection of GCsM into mice with already established severe colitis abolishes the inflammation and results in significant clinical improvement within a few days. T-cells recovered from GCsM-treated mice reveal reduced secretion of pro-inflammatory cytokines IFN-M-oM-^AM-' or IL-17. Furthermore, accumulation of clusters of Foxp3+ CD4+ T-cells were detectable at local sites of inflammation in their colon. Thus, GCsM are able to modify T-cell responses in vitro and in vivo and are able to down-regulate and clinically cure an established severe T-cell mediated colitis. Bone marrow derived monocytes where cultured 16 h with media containing M-CSF (control monocytes) or media containing M-CSF and dexamethasone (GCsM). In three independent experiments, total RNA from GCsM and control monocytes was isolated and processed for microarray hybridization.

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Project description:Glucocorticoids (GC) are used as first line therapies for generalized suppression of inflammation (e.g. allergies or autoimmune diseases), but their long-term use is limited by severe side effects. Our previous work has revealed that GC induced a stable anti-inflammatory phenotype in monocytes, the glucocorticoid-stimulated monocytes (GCsM) that we now exploited for targeted GC-mediated therapeutic effects. We demonstrate that GCsM interact with T-cells in suppressing proliferation as well as cytokine release of CD8+ and especially CD4+ T-cells in vitro, and that they support generation of Foxp3+ cells. We therefore tested their immunosuppressive potential in CD4+ T-cell-induced colitis in vivo. We found that injection of GCsM into mice with already established severe colitis abolishes the inflammation and results in significant clinical improvement within a few days. T-cells recovered from GCsM-treated mice reveal reduced secretion of pro-inflammatory cytokines IFN- or IL-17. Furthermore, accumulation of clusters of Foxp3+ CD4+ T-cells were detectable at local sites of inflammation in their colon. Thus, GCsM are able to modify T-cell responses in vitro and in vivo and are able to down-regulate and clinically cure an established severe T-cell mediated colitis.

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