IL-1β-specific recruitment of GCN5 histone acetyltransferase induces the release of PAF1 from chromatin for the de-repression of inflammatory response genes

Nucleic Acids Res. 2013 Apr;41(8):4495-506. doi: 10.1093/nar/gkt156. Epub 2013 Mar 14.

Abstract

To determine the functional specificity of inflammation, it is critical to orchestrate the timely activation and repression of inflammatory responses. Here, we explored the PAF1 (RNA polymerase II associated factor)-mediated signal- and locus-specific repression of genes induced through the pro-inflammatory cytokine interleukin (IL)-1β. Using microarray analysis, we identified the PAF1 target genes whose expression was further enhanced by PAF1 knockdown in IL-1β-stimulated HepG2 hepatocarcinomas. PAF1 bound near the transcription start sites of target genes and dissociated on stimulation. In PAF1-deficient cells, more elongating RNA polymerase II and acetylated histones were observed, although IL-1β-mediated activation and recruitment of nuclear factor κB (NF-κB) were not altered. Under basal conditions, PAF1 blocked histone acetyltransferase general control non-depressible 5 (GCN5)-mediated acetylation on H3K9 and H4K5 residues. On IL-1β stimulation, activated GCN5 discharged PAF1 from chromatin, allowing productive transcription to occur. PAF1 bound to histones but not to acetylated histones, and the chromatin-binding domain of PAF1 was essential for target gene repression. Moreover, IL-1β-induced cell migration was similarly controlled through counteraction between PAF1 and GCN5. These results suggest that the IL-1β signal-specific exchange of PAF1 and GCN5 on the target locus limits inappropriate gene induction and facilitates the timely activation of inflammatory responses.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetylation
  • Animals
  • Carrier Proteins / chemistry
  • Carrier Proteins / metabolism*
  • Cell Line, Tumor
  • Cell Movement
  • Chromatin / metabolism*
  • Gene Expression Regulation*
  • Histone Acetyltransferases / metabolism*
  • Histones / metabolism
  • Humans
  • Inflammation Mediators / metabolism*
  • Interleukin-1beta / pharmacology*
  • Mice
  • NF-kappa B / metabolism
  • Nuclear Proteins / antagonists & inhibitors
  • Nuclear Proteins / genetics
  • Nuclear Proteins / metabolism
  • RNA Interference
  • Transcription Elongation, Genetic
  • Transcription Factors
  • Transcription Initiation Site
  • Transcription, Genetic
  • Urokinase-Type Plasminogen Activator / genetics
  • p300-CBP Transcription Factors / metabolism*

Substances

  • Carrier Proteins
  • Chromatin
  • Histones
  • Inflammation Mediators
  • Interleukin-1beta
  • NF-kappa B
  • Nuclear Proteins
  • PAF1 protein, human
  • RNA polymerase II associated factor 1, mouse
  • Transcription Factors
  • Histone Acetyltransferases
  • p300-CBP Transcription Factors
  • p300-CBP-associated factor
  • Urokinase-Type Plasminogen Activator