Nitric oxide stimulates Nrf2 nuclear translocation in vascular endothelium.

Published

Journal Article

Vascular endothelial cells respond to nitric oxide by activating MAPK pathways and upregulating stress-activated proteins such as gamma-glutamylcysteine synthetase (gamma-GCS) and heme oxygenase-1 (HO-1). Since consensus sequences for the antioxidant response element (ARE) are found in the promoters of the gamma-GCS and HO-1 genes, we examined nuclear translocation of Nrf2, a CNC-bZIP protein which binds to and activates the ARE. We found a dramatic increase in Nrf2 nuclear translocation 1-8h following the nitric oxide donor spermine NONOate. Translocation was inhibited by pretreatment of cells with N-acetylcysteine suggesting involvement of an oxidative mechanism in this response. Translocation was also blocked by PD 98059 and SB 203580, inhibitors of ERK and p38 pathways, respectively. In addition to effects on Nrf2 subcellular localization, spermine NONOate increased Nrf2 protein levels by a mechanism which was inhibited by PD 98059. Pretreatment with N-acetylcysteine, PD 98059, and SB 203580 decreased HO-1 upregulation in spermine NONOate-treated cells. These results suggest that ERK and p38 pathways may regulate nitric oxide-mediated adaptive responses in vascular endothelium via translocation of Nrf2 and activation of the ARE.

Full Text

Cited Authors

  • Buckley, BJ; Marshall, ZM; Whorton, AR

Published Date

  • August 2003

Published In

Volume / Issue

  • 307 / 4

Start / End Page

  • 973 - 979

PubMed ID

  • 12878207

Pubmed Central ID

  • 12878207

Electronic International Standard Serial Number (EISSN)

  • 1090-2104

International Standard Serial Number (ISSN)

  • 0006-291X

Digital Object Identifier (DOI)

  • 10.1016/s0006-291x(03)01308-1

Language

  • eng