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Detection of Inflammasome Activation and Pyroptotic Cell Death in Murine Bone Marrow-derived Macrophages
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NLRP3 inflammasome mediate palmitate-induced endothelial dysfunction.

Jun-Hui Xing1, Rui Li2, Yue-Qiao Gao3

  • 1Department of Cardiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China.

Life Sciences
|November 10, 2019
PubMed
Summary

Free fatty acids activate the NLRP3 inflammasome, causing endothelial dysfunction. Inhibiting NLRP3 restores normal insulin signaling and blood vessel function, highlighting a therapeutic target for metabolic diseases.

Keywords:
Endothelial dysfunctionInflammationInsulin resistanceNLRP3 inflammasome

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Area of Science:

  • Cardiovascular Biology
  • Metabolic Syndrome Research
  • Inflammation and Immunity

Background:

  • Free fatty acids (FFA) are implicated in insulin resistance and endothelial dysfunction.
  • The precise mechanisms linking FFA to these conditions are not fully understood.
  • The role of the NLRP3 inflammasome in FFA-induced endothelial dysfunction requires elucidation.

Purpose of the Study:

  • To investigate the role of the NLRP3 (NOD-like receptor pyrin domain containing-3) inflammasome in FFA-induced endothelial dysfunction.
  • To explore the involvement of the AMPKα (AMP-activated protein kinase) pathway and insulin signaling.

Main Methods:

  • Human umbilical vein endothelial cells (HUVECs) were treated with NLRP3 siRNA and stimulated with palmitate.
  • C57 BL/6J mice on a high-fat diet (HFD) were transfected with NLRP3 Lenti-Virus.
  • Western blotting assessed NLRP3 inflammasome, AMPKα, eNOS, and insulin signaling pathway components.
  • Endothelial function was evaluated by measuring endothelium-dependent vasodilation.

Main Results:

  • FFA activated NLRP3 inflammasome and IL-1β release in vitro and in vivo.
  • NLRP3 inhibition via siRNA or Lenti-Virus reversed palmitate-induced IL-1β release.
  • NLRP3 inhibition restored impaired insulin signaling (IRS-1, Akt) and eNOS phosphorylation.
  • Inhibition also rescued acetylcholine-mediated vasodilation impaired by palmitate.
  • AMPKα activation with AICAR inhibited NLRP3 inflammasome and IL-1β, restoring insulin signaling.

Conclusions:

  • NLRP3 inflammasome activation, mediated by AMPKα inactivation, drives palmitate-induced endothelial dysfunction.
  • The IL-1β-induced insulin signaling pathway is a key component of this process.
  • Targeting the NLRP3 inflammasome may offer a therapeutic strategy for FFA-related endothelial dysfunction.