Genomics

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VDR ChIP-seq in human monocytic THP-1 cell line


ABSTRACT: Treatment with calcitriol, a specific VDR agonist, augmented the heterodimerization between VDR and RXR. We also wanted to investigate its impact on VDR binding to genomic regions. ChIP-seq experiments were carried out with the human monocytic THP-1 cell line under either vehicle (1:1 DMSO-ethanol) or calcitriol (100 nM) treatment conditions. Our finding is that calcitriol may have both a stimulatory or an inhibitory effect on VDR binding depending on the presence of its specific response element (VDRE), a less specific nuclear receptor (NR) half-site or absence thereof ("None"). Upon calcitriol activation, VDRE-containing genomic regions showed considerably higher occupancies on average than in the control, vehicle-treated sample. A similar induction, but to a much lesser extent, was detected for the NR half-site-containing regions. In contrast, genomic regions not containing any of these specific response elements did not show any induction upon calcitriol treatment; they rather showed a decrease of binding in promoter regions. We can conclude that ligand-induced heterodimerization and binding of the NR to its response elements are correlated events.

ORGANISM(S): Homo sapiens

PROVIDER: GSE150652 | GEO | 2020/05/16

REPOSITORIES: GEO

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