Thioredoxin-mediated denitrosylation regulates cytokine-induced nuclear factor κB (NF-κB) activation.

Published

Journal Article

S-nitrosylation of nuclear factor κB (NF-κB) on the p65 subunit of the p50/p65 heterodimer inhibits NF-κB DNA binding activity. We have recently shown that p65 is constitutively S-nitrosylated in the lung and that LPS-induced injury elicits a decrease in SNO-p65 levels concomitant with NF-κB activation in the respiratory epithelium and initiation of the inflammatory response. Here, we demonstrate that TNFα-mediated activation of NF-κB in the respiratory epithelium similarly induces p65 denitrosylation. This process is mediated by the denitrosylase thioredoxin (Trx), which becomes activated upon cytokine-induced degradation of thioredoxin-interacting protein (Txnip). Similarly, inhibition of Trx activity in the lung attenuates LPS-induced SNO-p65 denitrosylation, NF-κB activation, and airway inflammation, supporting a pathophysiological role for this mechanism in lung injury. These data thus link stimulus-coupled activation of NF-κB to a specific, protein-targeted denitrosylation mechanism and further highlight the importance of S-nitrosylation in the regulation of the immune response.

Full Text

Duke Authors

Cited Authors

  • Kelleher, ZT; Sha, Y; Foster, MW; Foster, WM; Forrester, MT; Marshall, HE

Published Date

  • January 31, 2014

Published In

Volume / Issue

  • 289 / 5

Start / End Page

  • 3066 - 3072

PubMed ID

  • 24338024

Pubmed Central ID

  • 24338024

Electronic International Standard Serial Number (EISSN)

  • 1083-351X

Digital Object Identifier (DOI)

  • 10.1074/jbc.M113.503938

Language

  • eng

Conference Location

  • United States