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Related Experiment Videos

Interleukin-1 beta and lipopolysaccharide decrease soluble guanylyl cyclase in brain cells: NO-independent

Carlos E Pedraza1, María Antonia Baltrons, Michael T Heneka

  • 1Institute of Biotechnology and Biomedicine V. Villar Palasi, and Department of Biochemistry and Molecular Biology, Autonomous University of Barcelona, 08193 Bellaterra, Spain.

Journal of Neuroimmunology
|November 5, 2003
PubMed
Summary
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Interleukin-1beta and LPS reduce soluble guanylyl cyclase (sGC) in brain cells. This involves decreased sGC activity, protein, and mRNA, impacting NO-dependent signaling pathways.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cellular Signaling

Background:

  • Soluble guanylyl cyclase (sGC) plays a crucial role in cellular signaling pathways, particularly those involving nitric oxide (NO).
  • Previous studies indicated that lipopolysaccharide (LPS) down-regulates sGC in astroglial cells.
  • The precise mechanisms and the role of specific cytokines, such as Interleukin-1beta (IL-1beta), in this regulation were not fully elucidated.

Purpose of the Study:

  • To investigate the role of IL-1beta in the down-regulation of sGC in astroglial cells.
  • To elucidate the molecular mechanisms by which IL-1beta and LPS affect sGC expression and activity.
  • To determine if these effects occur in vivo within the adult rat brain.

Main Methods:

  • Cell culture experiments using astroglial cells exposed to LPS and IL-1beta.

Related Experiment Videos

  • Measurement of NO-dependent cyclic guanosine monophosphate (cGMP) accumulation.
  • Assessment of sGC activity and protein levels.
  • Analysis of sGC subunit mRNA and protein half-life.
  • In vivo studies involving focal injection of IL-1beta or LPS into the adult rat brain.

    • Main Results:

    • IL-1beta decreases NO-dependent cGMP accumulation in a time- and concentration-dependent manner, independent of LPS-induced IL-1beta release.
    • The effect of IL-1beta is receptor-mediated, mimicked by tumor necrosis factor-alpha, and leads to reduced sGC activity and protein levels.
    • Both IL-1beta and LPS shorten the half-life of the sGC beta1 subunit via a NO-independent, but transcription- and translation-dependent, mechanism.
    • IL-1beta and LPS induce a NO-dependent decrease in sGC subunit mRNA levels.
    • Reduced sGC subunit protein and mRNA are observed in the adult rat brain following focal IL-1beta or LPS injection.

    Conclusions:

    • IL-1beta, acting through its receptor, significantly impacts sGC function and expression in astroglial cells.
    • Both IL-1beta and LPS contribute to the down-regulation of sGC by affecting both protein stability and mRNA levels.
    • These findings highlight a novel NO-independent mechanism of sGC regulation by inflammatory cytokines in the brain, with implications for neurological conditions.