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Palmitic Acid Modulates Microglial Cell Response to Metabolic Endotoxemia in an In Vitro Study

Mateusz Chmielarz1, Beata Sobieszczańska1, Andrzej Teisseyre2

  • 1Department of Microbiology, Wroclaw Medical University, 50-365 Wroclaw, Poland.

Nutrients
|August 12, 2023
PubMed

Insights

Metabolic endotoxemia (ME) and saturated fatty acids directly increase inflammation and oxidative stress in microglial cells. Interferon-gamma (IFNγ) shows a protective effect against these detrimental impacts.

Area of Science:

  • Neuroscience
  • Immunology
  • Metabolic Research

Background:

  • Metabolic endotoxemia (ME), marked by elevated endotoxin levels and low-grade inflammation, is linked to metabolic syndrome and cognitive dysfunction.
  • ME may contribute to brain disorders like dementia, highlighting the need to understand its cellular mechanisms.

Purpose of the Study:

  • To investigate the direct and indirect effects of endotoxin (lipopolysaccharide, LPS) and palmitic acid (PA) on inflammatory and oxidative stress markers in human microglial cells (HMC3).
  • To assess the influence of interferon-gamma (IFNγ) on microglial responses to LPS and PA.

Main Methods:

  • In vitro study using human microglial HMC3 cells.
  • Cells were exposed directly to LPS and PA, or indirectly via macrophage metabolites.
  • Stimulation with IFNγ was used to evaluate its protective effects.

Main Results:

  • Direct exposure to LPS and PA significantly increased inflammatory mediators (IL-6, MCP-1, PGE2) and oxidative stress markers (ROS, COX-2, lipid peroxidation) in HMC3 cells.
  • Indirect exposure via macrophage metabolites showed a reduced inflammatory response but still induced oxidative stress.
  • IFNγ demonstrated a protective role, mitigating both inflammation and oxidative stress induced by LPS and PA.

Conclusions:

  • Both endotoxin and saturated fatty acids directly induce inflammation and oxidative stress in microglial cells, contributing to ME pathogenesis.
  • IFNγ exhibits a protective effect on microglial cells against endotoxin- and fatty acid-induced damage.
  • These findings offer insights into the neuroinflammatory mechanisms underlying metabolic disorders and cognitive decline.
Keywords:
inflammationmetabolic endotoxemiamicroglial cellsoxidative stresspalmitic acid

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