Nucleic Acids Research, Vol 24, Issue 9 1682-1687, Copyright © 1996 by Oxford University Press
CE Goldring, S Reveneau, M Algarte and JF Jeannin
A wide variety of cells usefully but sometimes destructively produce nitric
oxide via inducible nitric oxide synthase (iNOS). Data obtained by gel
shift analysis and reporter assays have linked murine iNOS gene induction
by cytokines and bacterial products with the binding of a number of
proteins to a proximal promoter, as well as to a distal enhancer of the
iNOS gene. Nevertheless, these techniques do not necessarily reflect
protein occupation of sites in vivo. To address this, we have used dimethyl
sulphate in vivo footprinting to determine binding events in the two murine
iNOS transcription control regions, using a classical lipopolysaccharide
induction of RAW 264.7 macrophages. Protein-DNA interactions are absent
before activation. Exposure to lipopolysaccharide induces protection at a
NF-kappaB site and hypersensitivity at a shared gamma-activated
site/interferon- stimulated response element within the enhancer.
Protections are seen at a NF-IL6, and an Oct site within the promoter. We
also observe modulations in guanine methylation at two regions which do not
correspond to any known putative binding elements. Furthermore, we confirm
the probable involvement of interferon regulatory factor-1 (binding to its
-901 to -913 site) and the binding of NF-kappaB to its proximal site. Our
data demonstrate an abundance of hitherto- unrecognised protein-DNA binding
events upon simple lipopolysaccharide activation of the iNOS gene and
suggests a role for protein-protein interactions in its transcriptional
induction.
ARTICLES
In vivo footprinting of the mouse inducible nitric oxide synthase gene: inducible protein occupation of numerous sites including Oct and NF-IL6
Cancer Immunotherapy Laboratory, Ecole Pratique des Hautes Etudes, Faculte de Medecine, Dijon, France.
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