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Basic Research in Cardiology

, 107:283 | Cite as

Transcriptional regulation of Nox4 by histone deacetylases in human endothelial cells

  • Daniel Siuda
  • Ulrich Zechner
  • Nady El Hajj
  • Dirk Prawitt
  • David Langer
  • Ning Xia
  • Sven Horke
  • Andrea Pautz
  • Hartmut Kleinert
  • Ulrich Förstermann
  • Huige Li
Original Contribution

Abstract

Nox4 is a member of the NADPH oxidase family, which represents a major source of reactive oxygen species (ROS) in the vascular wall. Nox4-mediated ROS production mainly depends on the expression levels of the enzyme. The present study was aimed to investigate the mechanisms of Nox4 transcription regulation by histone deacetylases (HDAC). In human umbilical vein endothelial cells (HUVEC) and HUVEC-derived EA.hy 926 cells, treatment with the pan-HDAC inhibitor scriptaid led to a marked decrease in Nox4 mRNA expression. A similar down-regulation of Nox4 mRNA expression was observed by siRNA-mediated knockdown of HDAC3. HDAC inhibition in endothelial cells was associated with enhanced histone acetylation, increased chromatin accessibility in the human Nox4 promoter region, with no significant changes in DNA methylation. In addition, we provided evidence that c-Jun played an important role in controlling Nox4 transcription. Knockdown of c-Jun with siRNA led to a down-regulation of Nox4 mRNA expression. In response to scriptaid treatment, the binding of c-Jun to the Nox4 promoter region was reduced despite the open chromatin structure. In parallel, the binding of RNA polymerase IIa to the Nox4 promoter was significantly inhibited as well, which may explain the reduction in Nox4 transcription. In conclusion, HDAC inhibition decreases Nox4 transcription in human endothelial cells by preventing the binding of transcription factor(s) and polymerase(s) to the Nox4 promoter, most likely because of a hyperacetylation-mediated steric inhibition.

Keywords

NADPH oxidase Nox4 Endothelial cells Histone deacetylase Gene regulation 

Notes

Acknowledgments

This work was supported by the Deutsche Forschungsgemeinschaft [DFG, grant LI-1042/1-1], by the Federal Ministry of Education and Research (BMBF 01EO1003), and by a grant from the University Medical Center (Schwerpunkt Vaskuläre Prävention). D. Langer was supported by a PhD-scholarship of the Studienstiftung des deutschen Volkes. We thank Gisela Reifenberg for excellent technical assistance.

Conflict of interest

None.

Supplementary material

395_2012_283_MOESM1_ESM.pdf (494 kb)
Supplementary material 1 (PDF 493 kb)

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Daniel Siuda
    • 1
    • 2
  • Ulrich Zechner
    • 3
  • Nady El Hajj
    • 3
  • Dirk Prawitt
    • 4
  • David Langer
    • 4
  • Ning Xia
    • 1
  • Sven Horke
    • 1
  • Andrea Pautz
    • 1
  • Hartmut Kleinert
    • 1
  • Ulrich Förstermann
    • 1
  • Huige Li
    • 1
  1. 1.Department of PharmacologyUniversity Medical Center, Johannes Gutenberg UniversityMainzGermany
  2. 2.Center of Thrombosis and Hemostasis (CTH)University Medical Center, Johannes Gutenberg UniversityMainzGermany
  3. 3.Institute of Human GeneticsUniversity Medical Center, Johannes Gutenberg UniversityMainzGermany
  4. 4.Centre for Paediatrics and Adolescent MedicineUniversity Medical Center, Johannes Gutenberg UniversityMainzGermany

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