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Isolation and In vitro Culture of Bone Marrow-Derived Macrophages for the Study of NO-Redox Biology
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Influence of iNOS and COX on peroxiredoxin gene expression in primary macrophages

Antje Bast1, Saskia F Erttmann, Reinhard Walther

  • 1Friedrich Loeffler Institute of Medical Microbiology, Ernst Moritz Arndt University of Greifswald, Greifswald, Germany. antje.bast@uni-greifswald.de

Free Radical Biology & Medicine
|September 28, 2010
PubMed

Insights

Peroxiredoxins (Prxs), antioxidant enzymes, are upregulated in mouse macrophages by LPS and IFNγ stimulation. Their expression involves protein kinases, nitric oxide, and prostaglandin pathways, suggesting a role in combating oxidative stress.

Area of Science:

  • Immunology
  • Molecular Biology
  • Biochemistry

Background:

  • Peroxiredoxins (Prxs) are key antioxidant enzymes involved in cellular defense.
  • Understanding Prx gene regulation in macrophages is crucial for inflammatory and infectious disease research.

Purpose of the Study:

  • To investigate the regulatory mechanisms of Prx gene expression in murine bone marrow-derived macrophages (BMMs).
  • To identify signaling pathways involved in Prx induction by lipopolysaccharide (LPS) and interferon-gamma (IFNγ).

Main Methods:

  • Cultured BMMs from C57BL/6 and BALB/c mice under serum-free conditions.
  • Stimulation with LPS and IFNγ to analyze Prx mRNA levels.
  • Investigated signaling pathways including protein kinases (JAK2, PI3K, p38 MAPK), nitric oxide synthase (iNOS), NADPH oxidase, cyclooxygenases, and prostaglandin E(2).

Main Results:

  • LPS and IFNγ increased mRNA levels of Prx 1, 2, 4, 5, and 6 in BMMs.
  • Prx 1, 2, 4, and 6 were more strongly induced in C57BL/6 BMMs.
  • Prx 5 and 6 upregulation involved JAK2, PI3K, and p38 MAPK activation.
  • Nitric oxide contributed to Prx 1, 2, 4, and 6 induction, while superoxide was not involved.
  • Prx 6 induction was also regulated by cyclooxygenases and prostaglandin E(2) in an NO-independent manner.

Conclusions:

  • Prx gene expression in macrophages is differentially regulated by inflammatory stimuli.
  • Multiple signaling pathways, including kinase, NO, and prostaglandin pathways, contribute to Prx induction.
  • Prxs likely play a significant role in macrophage defense against oxidative stress during inflammation and infection.

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