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NF-κB activation via MyD88-dependent Toll-like receptor signaling is inhibited by trichothecene mycotoxin

Kei-ichi Sugiyama1, Masashi Muroi, Mawo Kinoshita

  • 1Division of Genetics and Mutagenesis, National Institute of Health Sciences.

The Journal of Toxicological Sciences
|March 11, 2016
PubMed

Insights

Deoxynivalenol (DON) exposure inhibits nuclear factor κB (NF-κB) activation in macrophages by disrupting the Myeloid differentiation factor 88 (MyD88)-dependent Toll-like receptor (TLR) signaling pathway, impacting innate immunity.

Area of Science:

  • Immunology
  • Toxicology
  • Molecular Biology

Background:

  • Macrophages are key innate immune cells recognizing pathogens via Toll-like receptors (TLRs).
  • Myeloid differentiation factor 88 (MyD88) is crucial for TLR-mediated inflammatory cytokine production through nuclear factor κB (NF-κB) activation.
  • Deoxynivalenol (DON), a trichothecene mycotoxin, exhibits immunotoxicity by interfering with macrophage inflammatory responses.

Discussion:

  • This study examines DON's impact on NF-κB activation in macrophages via MyD88-dependent pathways.
  • DON was found to inhibit NF-κB reporter activity induced by MyD88-dependent TLR agonists.
  • The mycotoxin also attenuated lipopolysaccharide-induced phosphorylation of key signaling molecules and downregulated MyD88 expression.

Key Insights:

  • DON inhibits NF-κB activation in activated macrophages.
  • The mechanism involves interference with MyD88-dependent TLR signaling.
  • DON downregulates MyD88 expression, a critical adaptor in TLR pathways.

Outlook:

  • Understanding DON's immunotoxic mechanisms is vital for risk assessment.
  • Further research could explore therapeutic strategies to counteract DON's effects on innate immunity.
  • This study highlights the vulnerability of TLR signaling pathways to mycotoxin-induced disruption.

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