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Short-term time course of the effects of 1α,25-dihydroxyvitamin D3 treatment on open chromatin regions in THP-1 monocytic leukemia cells

ABSTRACT: Open chromatin regions have been shown to associate with the location of transcriptiotal enhancers, i.e., the binding locations of DNA-binding transcription factors. To investigate the effects of short-term treatment by the nuclear hormone 1α,25-dihydroxyvitamin D3 (VD), a specific ligand of the transcription factor vitamin D receptor, on chromatin accessibility, FAIRE-seq was utilized on the chromatin samples from THP-1 monocytic leukemia cells that were treated with 100 nM 1α,25-dihydroxyvitamin D3 for 20, 40, 60, 80, 100 and 120 min, or with vehicle (0.1% (v/v) ethanol) for 20 and 100 min.

ORGANISM(S): Homo sapiens

PROVIDER: GSE40075 | GEO | 2012/10/25

SECONDARY ACCESSION(S): PRJNA172741

REPOSITORIES: GEO

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Short-term time course of the effects of 1Î±,25-dihydroxyvitamin D3 treatment on open chromatin regions in THP-1 monocytic leukemia cells

Project description:Open chromatin regions have been shown to associate with the location of transcriptiotal enhancers, i.e., the binding locations of DNA-binding transcription factors. To investigate the effects of short-term treatment by the nuclear hormone 1Î±,25-dihydroxyvitamin D3 (VD), a specific ligand of the transcription factor vitamin D receptor, on chromatin accessibility, FAIRE-seq was utilized on the chromatin samples from THP-1 monocytic leukemia cells that were treated with 100 nM 1Î±,25-dihydroxyvitamin D3 for 20, 40, 60, 80, 100 and 120 min, or with vehicle (0.1% (v/v) ethanol) for 20 and 100 min. THP-1 monocytic leukemia cells were treated with 100 nM 1Î±,25-dihydroxyvitamin D3 for 20, 40, 60, 80, 100 and 120 min or with vehicle (0.1% (v/v) ethanol) for 20 and 100 min. Chromatin sample from one biological replicate for each time point was subjected to the FAIRE-seq protocol and subsequent data analysis using an Input chromatin sample as control.

2012-10-25 | E-GEOD-40075 | biostudies-arrayexpress

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Microarray analysis of human monocytic THP-1 cell treated with 1Î±,25-dihydroxyvitamin D3 or Trichostatin A and the combination of both

Project description:The nuclear hormone 1Î±,25-dihydroxyvitamin D3 (1Î±,25(OH)2D3) regulates its target genes via activation of the transcription factor vitamin D receptor (VDR) far more specifically than the chromatin modifier trichostatin A (TsA) via its inhibitory action on histone deacetylases. We selected the thrombomodulin gene locus with its complex pattern of three 1Î±,25(OH)2D3 target genes, five VDR binding sites and multiple histone acetylation and open chromatin regions as an example to investigate together with a number of reference genes, the primary transcriptional responses to 1Î±,25(OH)2D3 and TsA. Transcriptome-wide, 18.4% of all expressed genes are either up- or down-regulated already after a 90 min TsA treatment; their response pattern to 1Î±,25(OH)2D3 and TsA sorts them into at least six classes. TsA stimulates a far higher number of genes than 1Î±,25(OH)2D3 and dominates the outcome of combined treatments. However, 200 TsA target genes can be modulated by 1Î±,25(OH)2D3 and more than 1000 genes respond only when treated with both compounds. The genomic view on the genes suggests that the degree of acetylation at transcription start sites and VDR binding regions may determine the effect of TsA on mRNA expression and its interference with 1Î±,25(OH)2D3. Our findings may have implications on dual therapies using chromatin modifiers and nuclear receptor ligands. All conditions are performed in triplicate: one time point with TsA treatment and vehicle control and one time point with TsA, 1Î±,25-dihydroxyvitamin D3, the combination of both and vehicle

2012-10-25 | E-GEOD-36323 | biostudies-arrayexpress

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