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Copper modulates the phenotypic response of activated BV2 microglia through the release of nitric oxide

Alba Rossi-George1, Chang-Jiang Guo, Benjamin L Oakes

  • 1Department of Pharmacology and Toxicology, Rutgers University, Piscataway, NJ 08854, USA. Electr albarg@rci.rutgers.edu

Nitric Oxide : Biology and Chemistry
|July 24, 2012
PubMed

Insights

Copper (Cu(I)) alters microglial function by modulating nitric oxide (NO) release, shifting inflammatory M1 microglia to an adaptive M2 phenotype without affecting cell viability or iNOS expression.

Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Microglia, the central nervous system's immune cells, show persistent activation in neurodegenerative diseases.
  • This activation is linked to the release of cytotoxic mediators like nitric oxide (NO).
  • The role of redox transition metals, such as copper (Cu), in modulating microglial NO signaling and phenotype remains unclear.

Purpose of the Study:

  • To investigate the effects of copper(I) (Cu(I)) on nitric oxide (NO) production and microglial activation.
  • To determine if Cu(I) alters the phenotype of BV2 microglia, a common microglial cell model.
  • To test the hypothesis that copper alters NO signaling by changing the cellular redox environment.

Main Methods:

  • Utilized the BV2 microglial cell model to assess Cu(I) effects.
  • Measured cell viability, iNOS mRNA and protein expression, and nitrite release.
  • Employed immunofluorescence to analyze microglial phenotypes (M1 vs. M2) under various treatment conditions, including LPS and Cu(I).
  • Used the iNOS inhibitor 1400W to confirm the role of NO signaling.

Main Results:

  • Cu(I) did not affect BV2 microglial cell viability or basal iNOS expression and nitrite release.
  • In the presence of LPS, Cu(I) abrogated nitrite release without significantly altering iNOS expression, indicating modulation of NO reactivity.
  • Cu(I) treatment shifted BV2 microglia from an M1 (inflammatory) to an M2 (adaptive) phenotype when combined with LPS, a shift dependent on NO signaling.

Conclusions:

  • Cu(I) modulates NO release in microglia without altering iNOS expression, suggesting a post-transcriptional or post-translational regulatory mechanism.
  • Copper(I) induces a phenotypic switch in microglia from inflammatory (M1) to adaptive (M2), potentially impacting neuroinflammation.
  • These findings highlight copper's role in regulating microglial function and offer insights into neurodegenerative disease pathogenesis.

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