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Sustained elevation of cyclic guanosine monophosphate induces apoptosis in microglia

Birgit Nimmervoll1, Nina Svoboda, Beata Sacha

  • 1Department of Cell Biology, University of Salzburg, Hellbrunnerstr. 34, 5020 Salzburg, Austria.

Brain Research Bulletin
|August 18, 2009
PubMed

Insights

Elevated intracellular cyclic guanosine monophosphate (cGMP) for one hour or more triggers apoptosis in BV-2 and primary microglia. Inhibiting guanylyl cyclase or blocking cGMP signaling prevents this cell death.

Area of Science:

  • Cell Biology
  • Neuroscience
  • Immunology

Background:

  • Cyclic nucleotides, like cyclic guanosine monophosphate (cGMP), are crucial signaling molecules involved in cellular responses.
  • These responses range from transient effects to long-term plasticity, with cell death being the ultimate outcome.
  • Microglia play vital roles in the central nervous system, and understanding their death pathways is critical.

Purpose of the Study:

  • To investigate the role of elevated intracellular cyclic guanosine monophosphate (cGMP) in inducing cell death in microglial cells.
  • To determine if sustained cGMP levels promote apoptosis in both a microglial cell line (BV-2) and primary microglia.
  • To explore the potential of modulating cGMP levels as a therapeutic strategy in neuroinflammation.

Main Methods:

  • Murine microglial cell line (BV-2) and primary microglia were treated with ammonium, 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ), and 8-Bromo-cGMP (8-Br-cGMP).
  • Cell death was assessed using DAPI and annexin-V labeling to detect apoptotic markers.
  • Intracellular cGMP levels were quantified using an immunoassay.

Main Results:

  • Ammonium exposure increased apoptotic cell numbers and moderately elevated intracellular cGMP levels.
  • The guanylyl cyclase inhibitor ODQ suppressed ammonium-induced apoptosis, indicating cGMP's role.
  • Sustained exposure to the cGMP analogue 8-Br-cGMP significantly induced apoptosis in both BV-2 and primary microglia, evidenced by chromatin condensation and phosphatidylserine exposure.

Conclusions:

  • Chronic elevation of intracellular cGMP induces apoptosis in microglia, affecting nuclear structure and plasma membrane integrity.
  • Modulating cGMP levels represents a potential target for controlling microglial cell death.
  • These findings contribute to understanding the mechanisms of cell death in immune cells of the central nervous system.

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