NF-kappa B and transcriptional control of renal epithelial-inducible nitric oxide synthase.

Published

Journal Article

Expression of the inducible isoform of nitric oxide synthase (iNOS) is subject to strict tissue specific transcriptional control. Recently, the NF-kappa B/Rel family of transcription factors, and particularly c-rel, was shown to mediate bacterial lipopolysaccharide (LPS) induction of iNOS in macrophages. Since LPS is only a weak inducer of iNOS in most nonimmune cells, we investigated the role of NF-kappa B in the regulation of iNOS expression in mouse renal epithelial cells. We report that LPS activates NF-kappa B in renal epithelium, but that this is not sufficient for induction of iNOS activity. The NF-kappa B complexes activated by LPS in renal epithelium differ from those in macrophages in that they lack c-rel, which may explain the absence of iNOS induction in renal epithelium. Conversely, LPS and interferon-gamma (IFN) synergize to induce renal epithelial iNOS. Functional iNOS promoter analysis indicate that this synergistic induction requires NF-kappa B. We conclude that NF-kappa B is necessary but not sufficient for the induction of renal epithelial iNOS expression, and that in contrast to macrophages, c-rel does not appear to play a major role in the regulation of renal epithelial iNOS.

Full Text

Duke Authors

Cited Authors

  • Amoah-Apraku, B; Chandler, LJ; Harrison, JK; Tang, SS; Ingelfinger, JR; Guzman, NJ

Published Date

  • September 1995

Published In

Volume / Issue

  • 48 / 3

Start / End Page

  • 674 - 682

PubMed ID

  • 7474651

Pubmed Central ID

  • 7474651

International Standard Serial Number (ISSN)

  • 0085-2538

Digital Object Identifier (DOI)

  • 10.1038/ki.1995.337

Language

  • eng

Conference Location

  • United States