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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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GM-CSF priming drives bone marrow-derived macrophages to a pro-inflammatory pattern and downmodulates PGE2 in

Carlos Arterio Sorgi1, Stephanie Rose, Nathalie Court

  • 1Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto - Universidade de São Paulo - Ribeirão Preto, SP, Brazil.

Plos One
|July 19, 2012
PubMed

Insights

Granulocyte macrophage colony-stimulating factor (GM-CSF) priming alters macrophage mediator release during infection. GM-CSF reduces prostaglandin E2 (PGE2) production while increasing tumor necrosis factor-alpha (TNF-α) and nitric oxide (NO), enhancing host defense.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Macrophages are key immune cells that release lipid mediators and cytokines upon pathogen recognition via Toll-like receptors (TLRs).
  • Granulocyte macrophage colony-stimulating factor (GM-CSF) is crucial for effective immune responses against infections, aiding in microorganism clearance.
  • Understanding how GM-CSF influences macrophage mediator production is vital for developing targeted immunotherapies.

Purpose of the Study:

  • To investigate the effect of GM-CSF priming on mediator release from bone marrow-derived macrophages (BMDMs) stimulated with TLR2 ligands.
  • To elucidate the molecular mechanisms underlying GM-CSF-mediated changes in lipid mediator and cytokine production.

Main Methods:

  • Bone marrow-derived macrophages (BMDMs) were primed with GM-CSF and stimulated with various TLR2 ligands.
  • Production of lipid mediators (PGE2, LTB4) and cytokines (TNF-α, NO) was quantified.
  • Gene expression (PGE-synthase, TLRs, MyD88) and protein activation (NFκB pathway) were analyzed.

Main Results:

  • GM-CSF priming significantly decreased PGE2 production by BMDMs in response to TLR2 ligands, unlike non-primed cells.
  • This decrease in PGE2 was associated with reduced PGE-synthase mRNA and increased TNF-α and nitric oxide (NO) production.
  • GM-CSF priming enhanced TLR2, TLR4, and MyD88 mRNA expression and promoted NFκB pathway activation, independent of PPAR-γ.

Conclusions:

  • GM-CSF priming reprograms macrophages to a pro-inflammatory profile, characterized by reduced PGE2 and increased TNF-α and NO production.
  • This shift in mediator release is dependent on TLR2 signaling components, including co-receptors, CD14, MyD88, and NFκB activation.
  • GM-CSF-primed macrophages exhibit an enhanced profile relevant for combating infections.

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