The transcriptional regulator network of human inflammatory macrophages is defined by open chromatin.

Abstract:

:Differentiation of inflammatory macrophages from monocytes is characterized by an orderly integration of epigenetic and transcriptional regulatory mechanisms guided by lineage-determining transcription factors such as PU.1. Further activation of macrophages leads to a stimulus- or microenvironment-specific signal integration with subsequent transcriptional control established by the action of tissue- or signal-associated transcription factors. Here, we assess four histone modifications during human macrophage activation and integrate this information with the gene expression data from 28 different macrophage activation conditions in combination with GM-CSF. Bioinformatically, for inflammatory macrophages we define a unique network of transcriptional and epigenetic regulators (TRs), which was characterized by accessible promoters independent of the activation signal. In contrast to the general accessibility of promoters of TRs, mRNA expression of central TRs belonging to the TR network displayed stimulus-specific expression patterns, indicating a second level of transcriptional regulation beyond epigenetic chromatin changes. In contrast, stringent integration of epigenetic and transcriptional regulation was observed in networks of TRs established from somatic tissues and tissue macrophages. In these networks, clusters of TRs with permissive histone marks were associated with high gene expression whereas clusters with repressive chromatin marks were associated with absent gene expression. Collectively, these results support that macrophage activation during inflammation in contrast to lineage determination is mainly regulated transcriptionally by a pre-defined TR network.

journal_name

Cell Res

journal_title

Cell research

authors

Schmidt SV,Krebs W,Ulas T,Xue J,Baßler K,Günther P,Hardt AL,Schultze H,Sander J,Klee K,Theis H,Kraut M,Beyer M,Schultze JL

doi

10.1038/cr.2016.1

subject

Has Abstract

pub_date

2016-02-01 00:00:00

pages

151-70

issue

2

eissn

1001-0602

issn

1748-7838

pii

cr20161

journal_volume

26

pub_type

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