Signalling events involved in interferon-gamma-inducible macrophage nitric oxide generation

Immunology. 2003 Apr;108(4):513-22. doi: 10.1046/j.1365-2567.2003.01620.x.

Abstract

Nitric oxide (NO) produced by macrophages (Mphi) in response to interferon-gamma (IFN-gamma) plays a pivotal role in the control of intracellular pathogens. Current knowledge of the specific biochemical cascades involved in this IFN-gamma-inducible Mphi function is still limited. In the present study, we evaluated the participation of various second messengers--Janus kinase 2 (JAK2), signal transducer and activator of transcription (STAT) 1alpha, MAP kinase kinase (MEK1/2), extracellular signal-regulated kinases 1 and 2 (Erk1/Erk2) and nuclear factor kappa B (NF-kappaB)--in the regulation of NO production by IFN-gamma-stimulated J774 murine Mphi. The use of specific signalling inhibitors permitted us to establish that JAK2/STAT1alpha- and Erk1/Erk2-dependent pathways are the main players in IFN-gamma-inducible Mphi NO generation. To determine whether the inhibitory effect was taking place at the pre- and/or post-transcriptional level, we evaluated the effect of each antagonist on inducible nitric oxide synthase (iNOS) gene and protein expression, and on the capacity of IFN-gamma to induce JAK2, Erk1/Erk2 and STAT1alpha phosphorylation. All downregulatory effects occurred at the pretranscriptional level, except for NF-kappaB, which seems to exert its role in NO production through an iNOS-independent event. In addition, electrophoretic mobility shift assay (EMSA) analysis revealed that STAT1alpha is essential for IFN-gamma-inducible iNOS expression and NO production, whereas the contribution of NF-kappaB to this cellular regulation seems to be minimal. Moreover, our data suggest that Erk1/Erk2 are responsible for STAT1alpha Ser727 residue phosphorylation in IFN-gamma-stimulated Mphi, thus contributing to the full activation of STAT1alpha. Taken together, our results indicate that JAK2, MEK1/2, Erk1/Erk2 and STAT1alpha are key players in the IFN-gamma-inducible generation of NO by Mphi.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cell Line
  • Interferon-Stimulated Gene Factor 3
  • Interferon-gamma / pharmacology*
  • Janus Kinase 2
  • MAP Kinase Kinase 1
  • MAP Kinase Kinase 2
  • Macrophage Activation / drug effects
  • Macrophage Activation / physiology
  • Macrophages / drug effects
  • Macrophages / metabolism*
  • Mice
  • Mitogen-Activated Protein Kinase 1 / physiology
  • Mitogen-Activated Protein Kinase 3
  • Mitogen-Activated Protein Kinase Kinases / physiology
  • Mitogen-Activated Protein Kinases / physiology
  • NF-kappa B / antagonists & inhibitors
  • NF-kappa B / metabolism
  • Nitric Oxide / biosynthesis*
  • Nitric Oxide Synthase / metabolism
  • Nitric Oxide Synthase Type II
  • Phosphorylation
  • Protein-Serine-Threonine Kinases / physiology
  • Protein-Tyrosine Kinases / physiology
  • Proto-Oncogene Proteins*
  • Recombinant Proteins
  • Signal Transduction / physiology*
  • Transcription Factors / genetics
  • Translocation, Genetic

Substances

  • Interferon-Stimulated Gene Factor 3
  • NF-kappa B
  • Proto-Oncogene Proteins
  • Recombinant Proteins
  • Transcription Factors
  • gamma interferon activation factor
  • Nitric Oxide
  • Interferon-gamma
  • Nitric Oxide Synthase
  • Nitric Oxide Synthase Type II
  • Nos2 protein, mouse
  • Protein-Tyrosine Kinases
  • Jak2 protein, mouse
  • Janus Kinase 2
  • Protein-Serine-Threonine Kinases
  • Mitogen-Activated Protein Kinase 1
  • Mitogen-Activated Protein Kinase 3
  • Mitogen-Activated Protein Kinases
  • MAP Kinase Kinase 1
  • MAP Kinase Kinase 2
  • Map2k1 protein, mouse
  • Mitogen-Activated Protein Kinase Kinases