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Saturated fatty acids activate microglia via Toll-like receptor 4/NF-κB signalling

Zhen Wang1, Dexiang Liu, Fuwu Wang

  • 1Shandong Provincial Key Laboratory of Mental Disorders, Department of Histology and Embryology, Shandong University School of Medicine, 44#, Wenhua Xi Road, Jinan, Shandong 250012, People's Repubic of China.

The British Journal of Nutrition
|July 8, 2011
PubMed

Insights

Saturated fatty acids (SFAs) activate microglia, a key factor in Alzheimer's disease (AD) progression. This activation, mediated by the TLR4/NF-κB pathway, leads to the release of inflammatory molecules that can cause neuronal death.

Area of Science:

  • Neuroscience
  • Immunology
  • Biochemistry

Background:

  • Diets high in saturated fatty acids (SFAs) are linked to Alzheimer's disease (AD).
  • Microglial activation is a significant factor in AD pathogenesis.
  • The precise role of SFAs in initiating microglial activation and subsequent neuronal death is unclear.

Purpose of the Study:

  • To investigate if SFAs can initiate microglial activation.
  • To determine if SFA-induced microglial activation leads to neuronal death.
  • To elucidate the intracellular signaling pathways involved in SFA-mediated microglial activation.

Main Methods:

  • Utilized BV-2 microglial cell line and primary microglial cultures.
  • Assessed microglial activation via morphological changes and pro-inflammatory cytokine secretion.
  • Quantified mRNA levels of inflammatory mediators using RT-PCR.
  • Investigated intracellular signaling, including NF-κB pathway activation and Toll-like receptor 4 (TLR4) involvement.

Main Results:

  • Palmitic acid (PA) and stearic acid (SA) activated microglia, increasing pro-inflammatory cytokines, nitric oxide (NO), and reactive oxygen species (ROS).
  • SFA-induced inflammatory mediators triggered primary neuronal death.
  • PA activated the phosphorylation and nuclear translocation of NF-κB p65 subunit.
  • TLR4 signaling mediated PA-induced NF-κB activation and pro-inflammatory mediator release.

Conclusions:

  • SFAs, specifically PA and SA, can activate microglia in vitro.
  • Microglial activation by SFAs stimulates the TLR4/NF-κB pathway.
  • This pathway leads to the production of pro-inflammatory mediators, potentially contributing to neuronal death in AD.

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