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Humanin Ameliorates Free Fatty Acid-Induced Endothelial Inflammation by Suppressing the NLRP3 Inflammasome

Wenfeng Li1, Dandan Zhang1, Wenjin Yuan1

  • 1Department of Cardiology, Ganzhou People's Hospital, No. 18, Meiguan Road, Zhanggong District, Ganzhou, Jiangxi 341000, China.

ACS Omega
|September 14, 2020
PubMed

Insights

Humanin protects against cardiovascular disease by reducing inflammation and cell death. This mitochondrial peptide inhibits the NLRP3 inflammasome pathway, offering a potential new treatment for vascular damage.

Area of Science:

  • Cardiovascular Biology
  • Inflammation Research
  • Mitochondrial Medicine

Background:

  • Cardiovascular disease (CVD) remains a leading cause of mortality, with the NLRP3 inflammasome implicated in its inflammatory processes and vascular damage.
  • Elevated free fatty acids (FFAs) contribute to CVD progression, highlighting the need for therapeutic strategies targeting FFA-induced pathways.
  • Humanin, a mitochondrial-derived peptide, exhibits cytoprotective properties, but its role in FFA-induced NLRP3 inflammasome activation in cardiovascular contexts is unexplored.

Purpose of the Study:

  • To investigate the protective mechanisms of humanin against free fatty acid-induced endothelial injury in human aortic endothelial cells (HAECs).
  • To elucidate the molecular pathways through which humanin modulates the NLRP3 inflammasome and related cellular responses.

Main Methods:

  • Human aortic endothelial cells (HAECs) were treated with free fatty acids (FFAs) and humanin.
  • Assessed cell viability via lactate dehydrogenase (LDH) release.
  • Measured oxidative stress markers, including reactive oxygen species (ROS) and NOX2 expression.
  • Evaluated NLRP3 inflammasome components (NLRP3, p10) and adenosine monophosphate-activated protein kinase (AMPK) function.
  • Quantified inflammatory cytokine expression (IL-1β, IL-18).

Main Results:

  • Humanin treatment significantly reduced FFA-induced lactate dehydrogenase release, indicating protection against cell death.
  • Humanin suppressed oxidative stress by downregulating reactive oxygen species and NOX2.
  • Humanin mitigated NLRP3 inflammasome activation, evidenced by reduced NLRP3 and p10 levels.
  • Humanin restored adenosine monophosphate-activated protein kinase (AMPK) function impaired by FFAs.
  • Humanin inhibited the expression of pro-inflammatory cytokines IL-1β and IL-18.

Conclusions:

  • Humanin demonstrates significant protective effects against FFA-induced endothelial injury in HAECs.
  • Humanin acts by suppressing oxidative stress, inhibiting NLRP3 inflammasome activation, and restoring AMPK function.
  • These findings suggest humanin as a potential therapeutic candidate for cardiovascular diseases, particularly those involving FFA-mediated inflammation.

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